* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}


:root {
    --primary: #2563eb;
    --secondary: #1e40af;
    --accent: #f59e0b;
    --dark: #0f172a;
    --light: #f8fafc;
    --gray: #64748b;
    --success: #10b981;
    --white: #ffffff;
    --border: #e2e8f0;
    --danger: #ef4444;
    --purple: #8b5cf6;
    --orange: #f97316;
}

[data-theme="dark"] {
    --primary: #3b82f6;
    --secondary: #1d4ed8;
    --dark: #f8fafc;
    --light: #0f172a;
    --gray: #94a3b8;
    --white: #1e293b;
    --border: #334155;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: clamp(78px, 8vw, 112px);
}

body {
    background: var(--light);
    color: var(--dark);
    font-family: "Poppins", sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    overscroll-behavior-y: auto;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.header {
    backdrop-filter: blur(10px);
    background: color-mix(in srgb, var(--white) 90%, transparent);
    border-bottom: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    left: 0;
    position: fixed;
    right: 0;
    top: 0;
    z-index: 1000;
}

.nav-container {
    align-items: center;
    display: flex;
    justify-content: space-between;
    margin: 0 auto;
    max-width: 1400px;
    min-height: 76px;
    padding: 0.8rem 2rem;
}

.logo,
.footer-logo {
    align-items: center;
    color: var(--primary);
    display: inline-flex;
    font-size: 1.75rem;
    font-weight: 700;
    gap: 0.5rem;
}

.nav-menu {
    align-items: center;
    background: color-mix(in srgb, var(--white) 82%, transparent);
    border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
    border-radius: 999px;
    display: flex;
    gap: 0.25rem;
    list-style: none;
    padding: 0.35rem;
}

.nav-menu a {
    border-radius: 999px;
    color: var(--dark);
    display: inline-flex;
    font-size: 0.92rem;
    font-weight: 500;
    padding: 0.55rem 0.85rem;
    position: relative;
}

.nav-menu a::after {
    display: none;
}

.nav-menu a:hover {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
}

.header-actions {
    align-items: center;
    display: flex;
    gap: 0.85rem;
}

.mobile-menu-toggle {
    align-items: center;
    background: var(--primary);
    border: 0;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    display: none;
    font-size: 1.05rem;
    height: 42px;
    justify-content: center;
    width: 42px;
}

.theme-toggle {
    align-items: center;
    background: transparent;
    border: 2px solid var(--border);
    border-radius: 50%;
    color: var(--gray);
    cursor: pointer;
    display: flex;
    height: 44px;
    justify-content: center;
    transition: all 0.3s ease;
    width: 44px;
}

.theme-toggle:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

@media (max-width: 900px) {
    body.nav-open {
        overflow: hidden;
    }

    .nav-container {
        gap: 0.75rem;
    }

    .nav-menu {
        align-items: stretch;
        background: var(--white);
        border-radius: 8px;
        box-shadow: 0 24px 70px rgba(15, 23, 42, 0.18);
        display: grid;
        gap: 0.35rem;
        left: 1rem;
        opacity: 0;
        padding: 1rem;
        pointer-events: none;
        position: fixed;
        right: 1rem;
        top: 5.2rem;
        transform: translateY(-10px);
        transition: opacity 0.2s ease, transform 0.2s ease;
        z-index: 1001;
    }

    body.nav-open .nav-menu,
    .nav-container:focus-within .nav-menu {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .nav-menu a {
        border: 1px solid var(--border);
        justify-content: center;
        padding: 0.85rem;
        width: 100%;
    }

    .mobile-menu-toggle {
        display: inline-flex;
        order: 3;
    }

    .header-actions {
        margin-left: auto;
    }
}

.login-btn,
.branch-link {
    background: var(--primary);
    border: 0;
    border-radius: 25px;
    color: white;
    cursor: pointer;
    display: inline-flex;
    font-family: inherit;
    font-weight: 600;
    gap: 0.45rem;
    padding: 0.7rem 1.2rem;
    transition: all 0.3s ease;
}

.login-btn:hover,
.branch-link:hover {
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.35);
    transform: translateY(-2px);
}

.hero {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    margin-top: 78px;
    overflow: hidden;
    padding: 5rem 2rem;
    position: relative;
    text-align: center;
}

.hero::before {
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1000 100' fill='%23ffffff20'%3E%3Cpolygon points='0,100 1000,0 1000,100'/%3E%3C/svg%3E");
    bottom: 0;
    content: "";
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2.25rem, 6vw, 3.75rem);
    line-height: 1.15;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin: 0 auto 2rem;
    max-width: 720px;
}

.cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.cta-btn {
    align-items: center;
    border-radius: 999px;
    display: inline-flex;
    font-weight: 700;
    gap: 0.5rem;
    padding: 1rem 1.6rem;
    transition: all 0.3s ease;
}

.cta-primary {
    background: white;
    color: var(--primary);
}

.cta-secondary {
    border: 2px solid white;
    color: white;
}

.cta-btn:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    transform: translateY(-3px);
}

.stats {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    padding: 4rem 2rem;
}

.stat-card,
.branch-card,
.pyq-card,
.ai-card,
.video-panel,
.video-card {
    background: var(--white);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.stat-card {
    border-radius: 8px;
    border-top: 4px solid var(--primary);
    padding: 2rem;
    text-align: center;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-7px);
}

.stat-number {
    color: var(--primary);
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.section-block {
    padding: 4rem 2rem;
}

.ai-tools,
.section-block,
.footer {
    content-visibility: auto;
    contain-intrinsic-size: auto 720px;
}

.section-heading,
.pyq-header {
    margin-bottom: 2rem;
    text-align: center;
}

.section-heading h2,
.pyq-header h2,
.ai-tools h2 {
    font-size: clamp(2rem, 4vw, 2.6rem);
}

.section-heading p,
.pyq-header p {
    color: var(--gray);
    margin-top: 0.5rem;
}

.ai-tools {
    background: var(--dark);
    color: white;
    margin: 2rem 0;
    padding: 5rem 0;
}

.ai-tools h2 {
    margin-bottom: 3rem;
    text-align: center;
}

.ai-grid,
.branches-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.ai-card,
.branch-card,
.pyq-card {
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.ai-notepad-card textarea {
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(15, 23, 42, 0.12);
    border-radius: 8px;
    color: #0f172a;
    font: inherit;
    min-height: 120px;
    padding: 0.8rem;
    resize: vertical;
    width: 100%;
}

.video-subscription-card {
    border: 1px solid rgba(245, 158, 11, 0.38);
    color: inherit;
    cursor: pointer;
    text-decoration: none;
}

.ai-card {
    color: var(--dark);
    padding: 2rem;
    text-align: center;
}

.ai-card:hover,
.branch-card:hover,
.pyq-card:hover {
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.16);
    transform: translateY(-7px);
}

.ai-icon {
    color: var(--primary);
    font-size: 3rem;
    margin-bottom: 1rem;
}

.ai-card p {
    color: var(--gray);
    min-height: 54px;
}

.ai-card .login-btn {
    font-size: 0.85rem;
    margin-top: 1rem;
    padding: 0.55rem 1rem;
}

.branch-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.branch-tab {
    background: var(--primary);
    border: 0;
    border-radius: 999px;
    color: white;
    font: inherit;
    font-weight: 700;
    padding: 0.75rem 1.25rem;
}

.branch-image {
    align-items: center;
    color: white;
    display: flex;
    height: 96px;
    justify-content: center;
    position: relative;
}

.branch-image i {
    font-size: 3rem;
    opacity: 0.9;
}

.rank {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 999px;
    color: #1f2937;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.25rem 0.55rem;
    position: absolute;
    right: 0.55rem;
    top: 0.55rem;
}

.branch-content {
    padding: 1.4rem;
}

.branch-content h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
}

.sem-row {
    color: var(--gray);
    font-size: 0.85rem;
    margin: 0.3rem 0;
}

.sem-row span {
    color: var(--danger);
    font-weight: 700;
}

.pyq-header {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(245, 158, 11, 0.1));
    border-radius: 8px;
    padding: 2rem 1rem;
}

.pyq-hero {
    align-items: center;
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 1fr) auto;
    text-align: left;
}

.pyq-kicker {
    color: var(--primary);
    display: block;
    font-size: 0.78rem;
    font-weight: 800;
    margin-bottom: 0.4rem;
    text-transform: uppercase;
}

.pyq-hero-stats {
    display: grid;
    gap: 0.65rem;
    grid-template-columns: repeat(3, minmax(100px, 1fr));
}

.pyq-hero-stats span {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--gray);
    font-size: 0.78rem;
    padding: 0.75rem;
}

.pyq-hero-stats strong {
    color: var(--dark);
    display: block;
    font-size: 1rem;
}

.pyq-controls {
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(220px, 1.2fr) repeat(3, minmax(150px, 0.8fr));
    margin: 1.25rem 0;
}

.pyq-filter-panel {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
    padding: 1rem;
}

.pyq-controls label {
    color: var(--dark);
    display: grid;
    font-size: 0.82rem;
    font-weight: 700;
    gap: 0.35rem;
}

.pyq-controls input,
.pyq-controls select {
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--dark);
    font: inherit;
    padding: 0.75rem 0.85rem;
    width: 100%;
}

.pyq-results-bar {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: space-between;
    margin: 0 0 1.25rem;
}

.pyq-results-bar span {
    color: var(--gray);
    font-size: 0.9rem;
    font-weight: 700;
}

.pyq-result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    justify-content: flex-end;
}

.pyq-load-more {
    background: var(--primary);
    border: 0;
    border-radius: 999px;
    color: white;
    cursor: pointer;
    font: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.65rem 1rem;
}

.pyq-load-more.secondary {
    background: var(--dark);
}

.pyq-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.pyq-card {
    display: flex;
    flex-direction: column;
    min-height: 210px;
    padding: 0.9rem;
}

.pyq-paper-card {
    gap: 0.8rem;
}

.pyq-paper-card.uploaded {
    border-color: rgba(16, 185, 129, 0.35);
}

.pyq-paper-top {
    align-items: center;
    display: grid;
    gap: 0.85rem;
    grid-template-columns: auto minmax(0, 1fr);
}

.pyq-image {
    align-items: center;
    border-radius: 8px;
    color: white;
    display: flex;
    height: 44px;
    justify-content: center;
    margin-bottom: 0.55rem;
    width: 44px;
}

.pyq-paper-top .pyq-image {
    height: 54px;
    margin: 0;
    width: 54px;
}

.pyq-sems {
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 700;
}

.pyq-badge {
    align-items: center;
    background: rgba(37, 99, 235, 0.1);
    border-radius: 999px;
    color: var(--primary);
    display: inline-flex;
    font-size: 0.72rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    padding: 0.28rem 0.6rem;
}

.pyq-subjects {
    color: var(--gray);
    font-size: 0.75rem;
    margin: 0.2rem 0 0.6rem;
}

.pyq-score-row {
    display: grid;
    gap: 0.5rem;
    grid-template-columns: repeat(3, 1fr);
}

.pyq-score-row span {
    background: var(--light);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--gray);
    font-size: 0.72rem;
    padding: 0.55rem;
}

.pyq-score-row strong {
    color: var(--dark);
    display: block;
    font-size: 0.78rem;
}

.pyq-meta-list {
    display: grid;
    gap: 0.28rem;
    margin: 0.55rem 0 0.75rem;
}

.pyq-meta-list span {
    background: var(--light);
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--dark);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.28rem 0.55rem;
}

.pyq-actions {
    display: grid;
    gap: 0.5rem;
    grid-template-columns: 1fr 1fr;
    margin-top: auto;
}

.pyq-btn {
    align-items: center;
    background: var(--primary);
    border-radius: 999px;
    color: white;
    display: inline-flex;
    font-size: 0.78rem;
    font-weight: 700;
    gap: 0.35rem;
    justify-content: center;
    padding: 0.45rem 0.7rem;
    text-align: center;
}

.pyq-btn.secondary {
    background: var(--dark);
}

.video-panel {
    border-radius: 8px;
    padding: 1.5rem;
}

.video-studio {
    display: grid;
    gap: 1rem;
}

.modal-open {
    overflow: hidden;
}

.video-watch-modal {
    background: rgba(2, 6, 23, 0.78);
    display: none;
    inset: 0;
    padding: 1rem;
    place-items: center;
    position: fixed;
    z-index: 2000;
}

.video-watch-modal.open {
    display: grid;
}

.video-watch-dialog {
    background: #0b1220;
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 8px;
    box-shadow: 0 24px 70px rgba(2, 6, 23, 0.4);
    color: #e5e7eb;
    display: grid;
    gap: 1rem;
    max-height: 92vh;
    overflow: auto;
    padding: 1rem;
    width: min(1120px, 96vw);
}

.video-watch-dialog.compact {
    width: min(740px, 96vw);
}

.video-watch-top {
    align-items: start;
    display: flex;
    gap: 1rem;
    justify-content: space-between;
}

.video-watch-top h3 {
    color: #fff;
    font-size: 1.25rem;
    margin: 0.55rem 0 0.25rem;
}

.video-watch-description {
    color: #cbd5e1;
    font-size: 0.92rem;
    line-height: 1.55;
}

.video-watch-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.video-icon-btn {
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 8px;
    color: #fff;
    cursor: pointer;
    display: inline-flex;
    height: 2.35rem;
    justify-content: center;
    width: 2.35rem;
}

.video-player-shell {
    aspect-ratio: 16 / 9;
    background: #020617;
    border-radius: 8px;
    overflow: hidden;
}

.video-player-shell iframe,
.video-player-shell video {
    border: 0;
    display: block;
    height: 100%;
    object-fit: cover;
    width: 100%;
}

.video-lesson-panel {
    align-content: start;
    color: #e5e7eb;
    display: grid;
    gap: 0.75rem;
}

.video-lesson-panel h3 {
    color: #fff;
    font-size: 1.25rem;
}

.video-lesson-panel p {
    color: #cbd5e1;
    font-size: 0.9rem;
    line-height: 1.55;
}

.video-lesson-stats {
    display: grid;
    gap: 0.5rem;
    grid-template-columns: repeat(3, 1fr);
}

.video-lesson-stats span {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    color: #cbd5e1;
    font-size: 0.76rem;
    padding: 0.65rem;
}

.video-lesson-stats strong {
    color: #fff;
    display: block;
    font-size: 0.95rem;
}

.video-controls {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    margin-bottom: 1rem;
}

.video-controls label {
    color: var(--dark);
    display: flex;
    flex-direction: column;
    font-size: 0.88rem;
    font-weight: 700;
    gap: 0.35rem;
}

.video-controls select,
.video-controls input {
    background: var(--light);
    border: 2px solid var(--border);
    border-radius: 8px;
    color: var(--dark);
    font: inherit;
    padding: 0.75rem;
    width: 100%;
}

.video-upload {
    cursor: pointer;
}

.video-status {
    color: var(--success);
    font-size: 0.9rem;
    font-weight: 700;
    margin: 0.5rem 0 1rem;
    min-height: 1.4rem;
}

.video-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.video-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin: 1rem 0;
}

.video-summary span,
.video-badge {
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.18);
    border-radius: 999px;
    color: var(--primary);
    display: inline-flex;
    font-size: 0.8rem;
    font-weight: 700;
    gap: 0.4rem;
    padding: 0.35rem 0.65rem;
}

.video-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

.video-card.active {
    border-color: var(--primary);
    box-shadow: 0 18px 35px rgba(37, 99, 235, 0.16);
}

.video-badge {
    left: 0.8rem;
    position: absolute;
    top: 0.8rem;
    z-index: 1;
    background: rgba(255, 255, 255, 0.92);
}

.video-badge.inline {
    background: rgba(59, 130, 246, 0.16);
    border-color: rgba(147, 197, 253, 0.3);
    color: #bfdbfe;
    justify-self: start;
    position: static;
}

.video-frame {
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #0f172a, #1e3a8a);
    width: 100%;
}

.video-card-preview {
    align-items: center;
    color: #e2e8f0;
    display: grid;
    gap: 0.35rem;
    height: 100%;
    justify-items: center;
    padding: 1rem;
    text-align: center;
}

.video-card-preview i {
    color: #93c5fd;
    font-size: 2.4rem;
}

.video-card-preview strong {
    color: #fff;
    font-size: 0.95rem;
}

.video-card-preview span {
    color: #cbd5e1;
    font-size: 0.78rem;
}

.video-placeholder {
    align-items: center;
    color: #e2e8f0;
    display: flex;
    font-size: 2rem;
    height: 100%;
    justify-content: center;
}

.video-content {
    padding: 1rem;
}

.video-content h3 {
    font-size: 1rem;
    margin-bottom: 0.35rem;
}

.video-content p {
    color: var(--gray);
    font-size: 0.78rem;
    margin-bottom: 0.8rem;
}

.video-content .video-meta {
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 700;
}

.video-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.video-library-link {
    align-items: center;
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.16);
    border-radius: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding: 0.85rem;
}

.video-library-link span {
    color: var(--gray);
    font-size: 0.78rem;
}

.video-btn {
    align-items: center;
    background: var(--primary);
    border: 0;
    border-radius: 999px;
    color: white;
    display: inline-flex;
    font-size: 0.8rem;
    font-weight: 700;
    gap: 0.35rem;
    padding: 0.5rem 0.75rem;
}

.video-btn.secondary {
    background: var(--success);
}

.video-btn.ghost {
    background: rgba(255, 255, 255, 0.12);
}

.video-btn.ghost.active {
    background: rgba(59, 130, 246, 0.95);
}

.video-empty-state {
    align-items: center;
    color: #cbd5e1;
    display: grid;
    min-height: 260px;
    place-items: center;
    text-align: center;
}

.lecture-page {
    background: var(--light);
    min-height: 100vh;
    padding: 6.5rem 5% 3rem;
}

.lecture-hero {
    align-items: end;
    display: grid;
    gap: 1.5rem;
    grid-template-columns: minmax(0, 1fr) auto;
    margin: 0 auto 1.5rem;
    max-width: 1400px;
}

.lecture-hero h1 {
    color: var(--dark);
    font-size: clamp(2rem, 4vw, 3.4rem);
    letter-spacing: 0;
    line-height: 1.05;
    margin: 0.35rem 0 0.75rem;
}

.lecture-hero p {
    color: var(--gray);
    max-width: 760px;
}

.lecture-hero-stats {
    display: grid;
    gap: 0.6rem;
    grid-template-columns: repeat(3, minmax(110px, 1fr));
}

.lecture-hero-stats span {
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--gray);
    padding: 0.8rem;
}

.lecture-hero-stats strong {
    color: var(--primary);
    display: block;
    font-size: 1.25rem;
}

.lecture-layout {
    align-items: start;
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(250px, 300px) minmax(0, 1fr);
    margin: 0 auto;
    max-width: 1400px;
}

.lecture-filter-panel,
.lecture-main-panel,
.lecture-player-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.lecture-filter-panel {
    display: grid;
    gap: 1rem;
    padding: 1rem;
    position: sticky;
    top: 6rem;
}

.lecture-filter-panel label {
    color: var(--dark);
    display: grid;
    font-size: 0.78rem;
    font-weight: 700;
    gap: 0.35rem;
}

.lecture-filter-panel select,
.lecture-filter-panel input {
    background: var(--light);
    border: 2px solid var(--border);
    border-radius: 8px;
    color: var(--dark);
    font: inherit;
    padding: 0.75rem;
    width: 100%;
}

.lecture-main-panel {
    display: grid;
    gap: 1rem;
    padding: 1rem;
}

.lecture-player-card {
    box-shadow: none;
    display: grid;
    gap: 1rem;
    overflow: hidden;
    padding: 1rem;
}

.lecture-player-frame {
    aspect-ratio: 16 / 9;
    background: #020617;
    border-radius: 8px;
    max-height: 430px;
    overflow: hidden;
}

.lecture-player-frame iframe,
.lecture-player-frame video {
    border: 0;
    display: block;
    height: 100%;
    object-fit: cover;
    width: 100%;
}

.lecture-player-info {
    display: grid;
    gap: 0.65rem;
}

.lecture-player-info h2,
.lecture-toolbar h2 {
    color: var(--dark);
    font-size: 1.2rem;
}

.lecture-player-info p,
.lecture-toolbar p {
    color: var(--gray);
    font-size: 0.9rem;
}

.lecture-player-empty {
    align-items: center;
    color: var(--gray);
    display: grid;
    min-height: 240px;
    place-items: center;
    text-align: center;
}

.lecture-player-empty i {
    color: var(--primary);
    font-size: 3rem;
}

.lecture-toolbar {
    align-items: center;
    display: flex;
    gap: 1rem;
    justify-content: space-between;
}

.lecture-view-tabs {
    background: var(--light);
    border: 1px solid var(--border);
    border-radius: 8px;
    display: inline-flex;
    padding: 0.25rem;
}

.lecture-view-tabs button {
    background: transparent;
    border: 0;
    border-radius: 6px;
    color: var(--gray);
    cursor: pointer;
    font: inherit;
    font-size: 0.84rem;
    font-weight: 700;
    padding: 0.5rem 0.7rem;
}

.lecture-view-tabs button.active {
    background: var(--primary);
    color: white;
}

.lecture-grid {
    display: grid;
    gap: 0.85rem;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.lecture-grid.list-view {
    grid-template-columns: 1fr;
}

.lecture-load-more {
    justify-content: center;
    margin: 1rem auto 0;
    min-width: min(100%, 230px);
}

.lecture-load-more[hidden] {
    display: none !important;
}

.lecture-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    display: grid;
    gap: 0.75rem;
    grid-template-columns: 54px minmax(0, 1fr);
    min-height: 150px;
    padding: 0.9rem;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.lecture-card:hover,
.lecture-card.active {
    border-color: var(--primary);
    box-shadow: 0 14px 30px rgba(37, 99, 235, 0.12);
    transform: translateY(-2px);
}

.lecture-card-icon {
    align-items: center;
    background: linear-gradient(135deg, #0f172a, #2563eb);
    border-radius: 8px;
    color: white;
    display: flex;
    height: 54px;
    justify-content: center;
    width: 54px;
}

.lecture-card h3 {
    color: var(--dark);
    font-size: 0.98rem;
    line-height: 1.35;
    margin: 0.55rem 0 0.45rem;
}

.lecture-card p {
    color: var(--gray);
    font-size: 0.8rem;
    line-height: 1.45;
    margin-bottom: 0.35rem;
}

@media (max-width: 860px) {
    .pyq-hero {
        grid-template-columns: 1fr;
    }

    .video-lesson-stats,
    .pyq-hero-stats,
    .pyq-score-row,
    .lecture-hero,
    .lecture-layout {
        grid-template-columns: 1fr;
    }

    .lecture-filter-panel {
        position: static;
    }

    .lecture-toolbar,
    .video-library-link {
        align-items: stretch;
        flex-direction: column;
    }
}

.footer {
    background: #0f172a;
    color: white;
    margin-top: 4rem;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.footer p,
.footer a {
    color: #94a3b8;
}

.footer a {
    display: block;
    margin-top: 0.45rem;
    text-decoration: none;
    transition: color 160ms ease, transform 160ms ease;
}

.footer a:hover,
.footer a:focus-visible {
    color: #fff;
    transform: translateX(2px);
}

.footer .footer-logo {
    color: #f8fafc;
}

.footer h4 {
    margin-bottom: 0.75rem;
}

.social-links {
    display: flex;
    font-size: 1.4rem;
    gap: 1rem;
    margin-top: 1rem;
}

.footer-bottom {
    border-top: 1px solid #334155;
    margin: 2rem auto 0;
    max-width: 1400px;
    padding-top: 2rem;
    text-align: center;
}

.fade-in {
    opacity: 0;
    transform: translateY(28px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Premium monochrome UI refresh: frontend-only visual layer. */
:root {
    --primary: #111827;
    --secondary: #000000;
    --accent: #ef4444;
    --dark: #111827;
    --light: #f5f5f3;
    --gray: #667085;
    --success: #0f766e;
    --white: rgba(255, 255, 255, 0.86);
    --border: rgba(17, 24, 39, 0.12);
    --danger: #dc2626;
    --glass: rgba(255, 255, 255, 0.72);
    --glass-strong: rgba(255, 255, 255, 0.9);
    --ink: #0a0a0a;
    --muted-ink: #52525b;
    --premium-shadow: 0 22px 70px rgba(17, 24, 39, 0.12);
    --soft-shadow: 0 14px 36px rgba(17, 24, 39, 0.08);
}

[data-theme="dark"] {
    --primary: #f8fafc;
    --secondary: #e5e7eb;
    --accent: #f87171;
    --dark: #f8fafc;
    --light: #09090b;
    --gray: #a1a1aa;
    --white: rgba(24, 24, 27, 0.82);
    --border: rgba(255, 255, 255, 0.13);
    --glass: rgba(24, 24, 27, 0.7);
    --glass-strong: rgba(24, 24, 27, 0.92);
}

body {
    background:
        radial-gradient(circle at 18% 0%, rgba(239, 68, 68, 0.1), transparent 28rem),
        radial-gradient(circle at 88% 12%, rgba(17, 24, 39, 0.08), transparent 24rem),
        linear-gradient(135deg, var(--light), color-mix(in srgb, var(--light) 86%, white));
    letter-spacing: 0;
}

body::before {
    background-image: radial-gradient(color-mix(in srgb, var(--dark) 18%, transparent) 1px, transparent 1px);
    background-size: 18px 18px;
    content: "";
    inset: 0;
    mask-image: linear-gradient(to bottom, black, transparent 68%);
    opacity: 0.22;
    pointer-events: none;
    position: fixed;
    z-index: -1;
}

.header {
    backdrop-filter: blur(24px) saturate(1.35);
    background: color-mix(in srgb, var(--glass-strong) 82%, transparent);
}

.logo {
    color: var(--dark);
    letter-spacing: 0;
}

.logo i {
    color: var(--accent);
}

.nav-menu {
    backdrop-filter: blur(18px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42), 0 12px 34px rgba(17, 24, 39, 0.08);
}

.nav-menu a {
    font-weight: 700;
    letter-spacing: 0;
}

.nav-menu a:hover {
    background: var(--dark);
    color: var(--light);
}

.theme-toggle,
.mobile-menu-toggle {
    box-shadow: var(--soft-shadow);
}

.hero {
    background:
        linear-gradient(rgba(0, 0, 0, 0.24), rgba(0, 0, 0, 0.54)),
        radial-gradient(circle at 50% 25%, rgba(255, 255, 255, 0.22), transparent 26rem),
        #070707;
    min-height: min(720px, calc(100vh - 78px));
    padding: 7rem 2rem 6rem;
}

.hero::before {
    background-image:
        radial-gradient(rgba(255, 255, 255, 0.34) 1px, transparent 1px),
        linear-gradient(120deg, transparent 0 46%, rgba(239, 68, 68, 0.22), transparent 54% 100%);
    background-size: 16px 16px, 100% 100%;
    opacity: 0.45;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2.6rem, 7vw, 6.8rem);
    letter-spacing: 0;
    line-height: 0.95;
    margin-inline: auto;
    max-width: 1050px;
    text-transform: uppercase;
}

.hero p {
    color: rgba(255, 255, 255, 0.82);
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-inline: auto;
    max-width: 780px;
}

.cta-btn,
.login-btn,
.branch-link,
.video-btn,
.pyq-btn,
.lecture-view-tabs button,
.mobile-menu-toggle {
    border-radius: 999px;
    transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
}

.cta-primary,
.login-btn,
.branch-link,
.video-btn,
.pyq-btn {
    background: var(--dark);
    color: var(--light);
}

.cta-secondary,
.video-btn.secondary,
.pyq-btn.secondary {
    background: var(--glass-strong);
    border: 1px solid var(--border);
    color: var(--dark);
}

.cta-btn:hover,
.login-btn:hover,
.branch-link:hover,
.video-btn:hover,
.pyq-btn:hover,
.lms-btn:hover {
    box-shadow: 0 18px 44px rgba(17, 24, 39, 0.18);
    transform: translateY(-3px);
}

.stat-card,
.ai-card,
.branch-card,
.video-panel,
.video-card,
.pyq-filter-panel,
.pyq-card,
.lecture-filter-panel,
.lecture-main-panel,
.lecture-player-card,
.lecture-card,
.lecture-hero-stats span,
.footer {
    backdrop-filter: blur(18px);
    background: var(--glass);
    border: 1px solid var(--border);
    box-shadow: var(--soft-shadow);
}

.stat-card,
.ai-card,
.branch-card,
.video-card,
.pyq-card,
.lecture-card {
    transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
}

.stat-card:hover,
.ai-card:hover,
.branch-card:hover,
.video-card:hover,
.pyq-card:hover,
.lecture-card:hover {
    border-color: color-mix(in srgb, var(--accent) 42%, var(--border));
    box-shadow: var(--premium-shadow);
    transform: translateY(-5px);
}

.stat-number,
.pyq-kicker,
.video-badge,
.lms-badge {
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
}

.section-heading h2,
.pyq-header h2,
.lecture-hero h1 {
    letter-spacing: 0;
    text-transform: uppercase;
}

.video-controls select,
.video-controls input,
.pyq-filter-panel select,
.pyq-filter-panel input,
.lecture-filter-panel select,
.lecture-filter-panel input,
.mini-input,
.mini-field input,
.mini-field select {
    background: color-mix(in srgb, var(--glass-strong) 84%, transparent);
    border: 1px solid var(--border);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.video-card-preview,
.lecture-card-icon,
.branch-image {
    background:
        radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.22), transparent 8rem),
        linear-gradient(135deg, #080808, #262626);
}

.pyq-hero,
.lecture-hero {
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.45)),
        radial-gradient(circle at 80% 20%, rgba(239, 68, 68, 0.12), transparent 16rem);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--soft-shadow);
    padding: 1.4rem;
}

.footer {
    background:
        radial-gradient(circle at 20% 0%, rgba(239, 68, 68, 0.18), transparent 22rem),
        #080808;
}

::-webkit-scrollbar {
    height: 10px;
    width: 10px;
}

::-webkit-scrollbar-track {
    background: color-mix(in srgb, var(--light) 80%, var(--border));
}

::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--dark) 72%, var(--gray));
    border: 2px solid var(--light);
    border-radius: 999px;
}

@keyframes premium-rise {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-card,
.ai-card,
.branch-card,
.video-card,
.pyq-card,
.lecture-card {
    animation: premium-rise 0.55s ease both;
}

@media (max-width: 900px) {
    .nav-menu {
        border-radius: 16px;
    }

    .hero {
        min-height: auto;
        padding-top: 5rem;
    }

    .hero h1 {
        font-size: clamp(2.35rem, 13vw, 4rem);
    }
}

/* Enterprise hierarchy redesign v2: distinct SaaS/tech-brand appearance. */
body {
    background:
        linear-gradient(90deg, rgba(10, 10, 10, 0.04) 1px, transparent 1px),
        linear-gradient(rgba(10, 10, 10, 0.04) 1px, transparent 1px),
        radial-gradient(circle at 82% 8%, rgba(239, 68, 68, 0.1), transparent 24rem),
        #f4f4f1;
    background-size: 42px 42px, 42px 42px, auto, auto;
}

[data-theme="dark"] body,
body[data-theme="dark"] {
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        radial-gradient(circle at 82% 8%, rgba(239, 68, 68, 0.18), transparent 24rem),
        #070707;
    background-size: 42px 42px, 42px 42px, auto, auto;
}

.header {
    background: transparent;
    border: 0;
    box-shadow: none;
    padding: 0.7rem 1rem;
}

.nav-container {
    background: color-mix(in srgb, var(--glass-strong) 82%, transparent);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--premium-shadow);
    gap: 0.75rem;
    min-height: 66px;
    padding: 0.7rem 1rem;
}

.logo {
    background: var(--dark);
    border-radius: 999px;
    color: var(--light);
    font-size: 1.05rem;
    padding: 0.65rem 0.95rem;
}

.nav-menu {
    background: transparent;
    border: 0;
    gap: 0;
    box-shadow: none;
}

.nav-menu a {
    font-size: 0.88rem;
    padding-inline: 0.62rem;
}

.header-actions {
    flex-shrink: 0;
}

.hero {
    align-items: end;
    display: grid;
    margin: 1rem;
    margin-top: 96px;
    min-height: calc(100vh - 120px);
    overflow: hidden;
    padding: clamp(2rem, 7vw, 7rem);
    text-align: left;
}

.hero-content {
    margin: 0;
    max-width: 1120px;
}

.hero-content::before {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    color: rgba(255, 255, 255, 0.86);
    content: "ENGILEARN / ENTERPRISE LMS";
    display: inline-flex;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    margin-bottom: 1rem;
    padding: 0.55rem 0.8rem;
}

.hero h1 {
    margin: 0;
    max-width: 980px;
}

.hero p {
    margin: 1.1rem 0 0;
}

.cta-buttons {
    justify-content: flex-start;
}

.section-block,
.stats,
.ai-tools {
    margin-top: 5rem;
}

.section-heading {
    align-items: end;
    border-bottom: 1px solid var(--border);
    display: grid;
    gap: 0.85rem;
    grid-template-columns: minmax(0, 0.75fr) minmax(260px, 0.45fr);
    margin-bottom: 1.3rem;
    padding-bottom: 1.1rem;
}

.section-heading::before {
    align-self: start;
    background: var(--dark);
    border-radius: 999px;
    color: var(--light);
    content: "MODULE";
    display: inline-flex;
    font-size: 0.72rem;
    font-weight: 800;
    grid-column: 1 / -1;
    justify-self: start;
    letter-spacing: 0.16em;
    padding: 0.4rem 0.65rem;
}

.section-heading h2 {
    font-size: clamp(1.8rem, 4vw, 4.4rem);
    line-height: 0.95;
    margin: 0;
}

.section-heading p {
    font-size: 0.98rem;
    margin: 0;
}

.stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.stat-card {
    min-height: 170px;
    padding: 1.4rem;
    text-align: left;
}

.stat-card:nth-child(1) {
    background: #0a0a0a;
    color: white;
}

.stat-card:nth-child(1) .stat-number {
    color: white;
}

.stat-number {
    font-size: clamp(2rem, 5vw, 4.8rem);
    line-height: 0.9;
}

.ai-grid,
.branches-grid,
.video-grid,
.pyq-grid,
.lecture-grid {
    align-items: stretch;
    display: grid;
    gap: 1rem;
}

.ai-grid {
    grid-template-columns: repeat(12, 1fr);
}

.ai-card {
    display: grid;
    grid-column: span 3;
    min-height: 240px;
    padding: 1.25rem;
}

.ai-card:nth-child(1),
.ai-card:nth-child(6),
.ai-card:nth-child(11) {
    background: #0a0a0a;
    color: white;
    grid-column: span 6;
}

.ai-card:nth-child(1) p,
.ai-card:nth-child(6) p,
.ai-card:nth-child(11) p {
    color: rgba(255, 255, 255, 0.72);
}

.ai-icon {
    background: color-mix(in srgb, var(--dark) 8%, transparent);
    border: 1px solid var(--border);
    border-radius: 18px;
    height: 54px;
    width: 54px;
}

.ai-card:nth-child(1) .ai-icon,
.ai-card:nth-child(6) .ai-icon,
.ai-card:nth-child(11) .ai-icon {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.16);
}

.branches-grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.branch-card {
    display: grid;
    min-height: 300px;
}

.branch-image {
    border-radius: 16px;
    margin: 1rem 1rem 0;
}

.video-panel,
.pyq-filter-panel,
.lecture-layout {
    border-radius: 22px;
}

.video-controls,
.pyq-controls {
    background: color-mix(in srgb, var(--white) 70%, transparent);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 1rem;
}

.video-card,
.pyq-card,
.lecture-card {
    border-radius: 18px;
}

.pyq-hero,
.lecture-hero {
    border-radius: 24px;
    margin-bottom: 1rem;
    overflow: hidden;
    position: relative;
}

.pyq-hero::after,
.lecture-hero::after {
    background-image: radial-gradient(color-mix(in srgb, var(--dark) 22%, transparent) 1px, transparent 1px);
    background-size: 16px 16px;
    content: "";
    inset: 0;
    opacity: 0.12;
    pointer-events: none;
    position: absolute;
}

.lecture-layout {
    background: color-mix(in srgb, var(--white) 40%, transparent);
    border: 1px solid var(--border);
    padding: 1rem;
}

.lecture-filter-panel {
    box-shadow: none;
}

.lecture-main-panel {
    box-shadow: none;
}

.footer {
    border-radius: 28px 28px 0 0;
    margin-inline: 1rem;
    overflow: hidden;
}

.contact-layout {
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(280px, 0.75fr) minmax(0, 1fr);
}

.contact-panel,
.contact-form {
    backdrop-filter: blur(18px);
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--soft-shadow);
    padding: clamp(1rem, 3vw, 1.5rem);
}

.contact-panel {
    align-content: start;
    display: grid;
    gap: 1rem;
}

.contact-panel h3 {
    color: var(--dark);
    font-size: clamp(1.45rem, 3vw, 2.5rem);
    line-height: 1.05;
    text-transform: uppercase;
}

.contact-panel p,
.contact-points span {
    color: var(--gray);
}

.contact-points {
    display: grid;
    gap: 0.7rem;
}

.contact-points span {
    align-items: center;
    display: flex;
    gap: 0.55rem;
}

.contact-socials {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    padding-top: 0.25rem;
}

.contact-socials a {
    align-items: center;
    aspect-ratio: 1;
    background: var(--dark);
    border: 1px solid var(--dark);
    border-radius: 14px;
    color: var(--white);
    display: inline-flex;
    font-size: 1rem;
    justify-content: center;
    text-decoration: none;
    transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    width: 42px;
}

.contact-socials a:hover,
.contact-socials a:focus-visible {
    background: var(--danger);
    border-color: var(--danger);
    color: #fff;
    transform: translateY(-3px);
}

.contact-form {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.contact-form label {
    color: var(--dark);
    display: grid;
    font-size: 0.78rem;
    font-weight: 800;
    gap: 0.4rem;
}

.contact-form .wide {
    grid-column: 1 / -1;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    background: color-mix(in srgb, var(--white) 76%, transparent);
    border: 1px solid var(--border);
    border-radius: 14px;
    color: var(--dark);
    font: inherit;
    padding: 0.85rem 0.9rem;
}

.contact-form textarea {
    min-height: 140px;
    resize: vertical;
}

.contact-status {
    color: var(--gray);
    font-size: 0.9rem;
    font-weight: 800;
    min-height: 1.3rem;
}

.contact-status.success {
    color: var(--success);
}

.contact-status.error {
    color: var(--danger);
}

@media (max-width: 1100px) {
    .ai-card,
    .ai-card:nth-child(1),
    .ai-card:nth-child(6),
    .ai-card:nth-child(11) {
        grid-column: span 6;
    }
}

@media (max-width: 760px) {
    .hero {
        margin-inline: 0.75rem;
        padding: 2rem 1rem;
        text-align: left;
    }

    .section-heading {
        grid-template-columns: 1fr;
    }

    .stats,
    .ai-grid {
        grid-template-columns: 1fr;
    }

    .ai-card,
    .ai-card:nth-child(1),
    .ai-card:nth-child(6),
    .ai-card:nth-child(11) {
        grid-column: span 1;
    }

    .contact-layout,
    .contact-form {
        grid-template-columns: 1fr;
    }
}

/* Show every semester row in branch cards. */
.branch-showcase .sem-subjects .sem-row,
.branch-showcase .sem-subjects .sem-row:nth-child(n+3) {
    display: block;
}

.branch-showcase .branch-card,
.branch-showcase .branch-card:nth-child(1),
.branch-showcase .branch-card:nth-child(2),
.branch-showcase .branch-card:nth-child(3),
.branch-showcase .branch-card:nth-child(4),
.branch-showcase .branch-card:nth-child(5) {
    min-height: 180px;
}

/* Device responsiveness final pass. Keeps existing design, fixes overflow across devices. */
html,
body {
    max-width: 100%;
    overflow-x: hidden;
}

img,
video,
iframe {
    max-width: 100%;
}

.nav-container,
.container,
.section-block,
.hero-content,
.footer-content {
    min-width: 0;
}

.nav-container {
    gap: 0.65rem;
}

/* Dedicated in-website PYQ library */
.pyq-library-page { margin: 0 auto; max-width: 1500px; padding: 7rem 1.25rem 3rem; }
.pyq-library-hero {
    align-items: end; background: #0b0b0d; border: 1px solid #26262a; border-radius: 20px; color: #fff;
    display: grid; gap: 1.5rem; grid-template-columns: minmax(0, 1fr) auto; margin-bottom: 1.25rem;
    padding: clamp(1.5rem, 4vw, 3.25rem);
}
.pyq-library-hero h1 { color: #fff; font-size: clamp(2rem, 5vw, 4rem); margin: 0.7rem 0; }
.pyq-library-hero p { color: #c8c8cc; margin: 0; max-width: 70ch; }
.pyq-library-stats { display: grid; gap: 0.55rem; grid-template-columns: repeat(2, minmax(110px, 1fr)); }
.pyq-library-stats span {
    background: #17171a; border: 1px solid #303035; border-radius: 8px; color: #aaaab0; display: grid; padding: 0.8rem;
}
.pyq-library-stats strong { color: #fff; font-size: 1.35rem; }
.pyq-step-flow {
    background: var(--white); border: 1px solid var(--border); border-radius: 12px;
    box-shadow: 0 18px 48px rgba(15, 23, 42, 0.06); margin-bottom: 1.25rem; padding: 1rem;
}
.pyq-step-flow-head {
    align-items: start; display: grid; gap: 1rem; grid-template-columns: minmax(0, 1fr) auto; margin-bottom: 0.9rem;
}
.pyq-step-flow-head h2 { color: var(--dark); font-size: clamp(1.25rem, 2.8vw, 2rem); line-height: 1.1; margin: 0.35rem 0; }
.pyq-step-flow-head p { color: var(--gray); margin: 0; max-width: 72ch; }
.pyq-step-crumbs { align-items: center; display: flex; flex-wrap: wrap; gap: 0.45rem; justify-content: flex-end; }
.pyq-step-crumbs a {
    align-items: center; background: color-mix(in srgb, var(--white) 88%, var(--border)); border: 1px solid var(--border);
    border-radius: 999px; color: var(--gray); cursor: pointer; display: inline-flex; font-weight: 700; gap: 0.4rem;
    min-height: 36px; padding: 0.38rem 0.7rem; text-decoration: none;
}
.pyq-step-crumbs a.active { background: var(--dark); border-color: var(--dark); color: var(--light); }
.pyq-step-crumbs span {
    align-items: center; background: rgba(0, 0, 0, 0.08); border-radius: 50%; display: inline-flex;
    font-size: 0.72rem; height: 22px; justify-content: center; width: 22px;
}
.pyq-step-picklists {
    display: grid; gap: 0.75rem; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-bottom: 0.9rem;
}
.pyq-step-picklists label {
    color: var(--gray); display: grid; font-size: 0.78rem; font-weight: 800; gap: 0.35rem;
}
.pyq-step-picklists select {
    background: var(--white); border: 1px solid var(--border); border-radius: 8px; color: var(--dark);
    min-height: 46px; min-width: 0; padding: 0.65rem; width: 100%;
}
.pyq-step-picklists select:disabled {
    cursor: not-allowed; opacity: 0.58;
}
.pyq-step-grid { display: grid; gap: 0.8rem; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.pyq-step-card {
    background: color-mix(in srgb, var(--white) 94%, var(--border)); border: 1px solid var(--border); border-radius: 10px;
    color: var(--dark); cursor: pointer; display: flex; flex-direction: column; gap: 0.65rem; min-height: 190px;
    min-width: 0; padding: 0.95rem; text-align: left; text-decoration: none;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.pyq-step-card:visited { color: var(--dark); }
.pyq-step-card:hover {
    border-color: var(--dark); box-shadow: 0 18px 42px rgba(15, 23, 42, 0.12); transform: translateY(-3px);
}
.pyq-step-card h3 {
    color: inherit; font-size: 1rem; line-height: 1.25; margin: 0; overflow-wrap: anywhere;
}
.pyq-step-card p { color: var(--gray); font-size: 0.82rem; line-height: 1.45; margin: 0; }
.pyq-step-index {
    align-self: flex-start; background: var(--dark); border-radius: 999px; color: var(--light);
    font-size: 0.68rem; font-weight: 800; letter-spacing: 0; padding: 0.34rem 0.56rem;
}
.pyq-step-meta { display: grid; gap: 0.45rem; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: auto; }
.pyq-step-meta span {
    background: var(--white); border: 1px solid var(--border); border-radius: 7px; color: var(--gray);
    display: grid; font-size: 0.7rem; padding: 0.5rem;
}
.pyq-step-meta strong { color: var(--dark); font-size: 0.95rem; }
.pyq-step-card-compact { min-height: 150px; }
.pyq-step-card-subject { min-height: 170px; }
.pyq-step-card-selected { cursor: default; grid-column: span 2; min-height: 0; }
.pyq-step-card-selected:hover { transform: none; }
.pyq-step-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: auto; }
.pyq-step-papers {
    background: color-mix(in srgb, var(--white) 96%, var(--border)); border: 1px solid var(--border);
    border-radius: 10px; grid-column: 1 / -1; padding: 1rem;
}
.pyq-step-papers-head { margin-bottom: 0.8rem; }
.pyq-step-papers-head h3 { color: var(--dark); font-size: clamp(1.1rem, 2vw, 1.55rem); margin: 0.35rem 0; }
.pyq-step-papers-head p { color: var(--gray); margin: 0; }
.pyq-step-paper-grid { display: grid; gap: 0.85rem; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pyq-library-layout { align-items: start; display: grid; gap: 1.25rem; grid-template-columns: 270px minmax(0, 1fr); }
.pyq-library-filters, .pyq-library-toolbar, .pyq-library-card { background: var(--white); border: 1px solid var(--border); border-radius: 8px; }
.pyq-library-filters { display: grid; gap: 0.85rem; padding: 1rem; position: sticky; top: 6.5rem; }
.pyq-library-filter-head, .pyq-library-toolbar, .pyq-library-card-top { align-items: center; display: flex; justify-content: space-between; }
.pyq-library-filter-head span { color: var(--dark); font-size: 1.05rem; font-weight: 700; }
.pyq-library-filter-head button {
    align-items: center; background: var(--dark); border: 0; border-radius: 50%; color: var(--light); cursor: pointer;
    display: inline-flex; height: 38px; justify-content: center; width: 38px;
}
.pyq-library-filters label { color: var(--gray); display: grid; font-size: 0.86rem; font-weight: 600; gap: 0.35rem; }
.pyq-library-filters select, .pyq-library-filters input {
    background: var(--white); border: 1px solid var(--border); border-radius: 6px; color: var(--dark);
    min-height: 44px; padding: 0.65rem; width: 100%;
}
.pyq-library-toolbar { gap: 1rem; margin-bottom: 1rem; padding: 1rem; }
.pyq-library-toolbar h2, .pyq-library-toolbar p { margin: 0.25rem 0 0; }
.pyq-repeat-panel {
    background: var(--white); border: 1px solid var(--border); border-radius: 8px; margin-bottom: 1rem;
    overflow: hidden; padding: 1rem;
}
.pyq-repeat-head, .pyq-repeat-title, .pyq-repeat-card-top, .pyq-repeat-summary {
    align-items: center; display: flex;
}
.pyq-repeat-head, .pyq-repeat-summary { justify-content: space-between; }
.pyq-repeat-head { gap: 1rem; margin-bottom: 0.9rem; }
.pyq-repeat-title { gap: 0.75rem; min-width: 0; }
.pyq-repeat-title h2, .pyq-repeat-title p { margin: 0.15rem 0 0; }
.pyq-repeat-title h2 { color: var(--dark); font-size: clamp(1.15rem, 2vw, 1.55rem); }
.pyq-repeat-title p { color: var(--gray); font-size: 0.86rem; }
.pyq-repeat-icon, .pyq-repeat-reset {
    align-items: center; background: var(--dark); border: 0; border-radius: 50%; color: var(--light);
    display: inline-flex; flex: 0 0 auto; height: 42px; justify-content: center; width: 42px;
}
.pyq-repeat-reset { cursor: pointer; }
.pyq-repeat-controls {
    display: grid; gap: 0.55rem; grid-template-columns: repeat(5, minmax(0, 1fr)); margin-bottom: 0.85rem;
}
.pyq-repeat-controls label {
    color: var(--gray); display: grid; font-size: 0.7rem; font-weight: 700; gap: 0.28rem;
}
.pyq-repeat-controls select {
    background: color-mix(in srgb, var(--white) 92%, var(--border)); border: 1px solid var(--border);
    border-radius: 6px; color: var(--dark); min-height: 40px; min-width: 0; padding: 0.5rem; width: 100%;
}
.pyq-repeat-summary {
    background: color-mix(in srgb, var(--white) 88%, var(--border)); border: 1px solid var(--border);
    border-radius: 6px; color: var(--gray); gap: 0.75rem; margin-bottom: 0.75rem; padding: 0.65rem 0.75rem;
}
.pyq-repeat-summary strong { color: var(--dark); }
.pyq-repeat-summary span { font-size: 0.74rem; text-align: right; }
.pyq-repeat-grid { display: grid; gap: 0.65rem; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.pyq-repeat-card {
    background: color-mix(in srgb, var(--white) 94%, var(--border)); border: 1px solid var(--border);
    border-radius: 7px; display: flex; flex-direction: column; min-width: 0; padding: 0.8rem;
}
.pyq-repeat-card-top { justify-content: space-between; }
.pyq-repeat-rank, .pyq-repeat-unit {
    border: 1px solid var(--border); border-radius: 999px; color: var(--dark); font-size: 0.66rem; font-weight: 800; padding: 0.25rem 0.42rem;
}
.pyq-repeat-rank { background: var(--dark); color: var(--light); }
.pyq-repeat-card h3 {
    color: var(--dark); font-size: 0.9rem; line-height: 1.45; margin: 0.65rem 0 0.35rem; overflow-wrap: anywhere;
}
.pyq-repeat-card > p { color: var(--gray); font-size: 0.7rem; margin: 0 0 0.65rem; }
.pyq-repeat-metrics { display: grid; gap: 0.35rem; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-bottom: 0.65rem; }
.pyq-repeat-metrics span {
    background: var(--white); border: 1px solid var(--border); border-radius: 5px; color: var(--gray);
    display: grid; font-size: 0.62rem; min-width: 0; padding: 0.38rem; text-align: center;
}
.pyq-repeat-metrics strong { color: var(--dark); font-size: 0.72rem; overflow-wrap: anywhere; }
.pyq-repeat-card .pyq-btn { justify-content: center; margin-top: auto; width: 100%; }
.pyq-repeat-more { margin-top: 0.75rem; width: 100%; }
.pyq-library-grid { align-items: start; display: grid; gap: 0.9rem; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pyq-library-card { align-self: start; display: flex; flex-direction: column; min-width: 0; padding: 1rem; }
.pyq-library-card h3, .pyq-library-card p {
    display: -webkit-box; overflow: hidden; overflow-wrap: anywhere; -webkit-box-orient: vertical;
}
.pyq-library-card h3 { color: var(--dark); font-size: 1rem; margin: 0.8rem 0 0.35rem; -webkit-line-clamp: 2; }
.pyq-library-card p { color: var(--gray); font-size: 0.82rem; margin: 0 0 0.8rem; -webkit-line-clamp: 2; }
.pyq-code, .pyq-year { border: 1px solid var(--border); border-radius: 999px; color: var(--dark); font-size: 0.7rem; font-weight: 700; padding: 0.3rem 0.5rem; }
.pyq-code { background: var(--dark); color: var(--light); }
.pyq-library-meta { display: grid; gap: 0.35rem; margin-bottom: 0.85rem; }
.pyq-library-meta span {
    align-items: center; color: var(--gray); display: flex; font-size: 0.72rem; gap: 0.4rem;
    min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.pyq-library-card .pyq-btn { justify-content: center; margin-top: auto; width: 100%; }
.pyq-detail-dialog {
    background: var(--white); border: 1px solid var(--border); border-radius: 8px; color: var(--dark);
    max-width: 680px; padding: 1.5rem; width: calc(100% - 2rem);
}
.pyq-detail-dialog::backdrop { background: rgba(0, 0, 0, 0.66); }
.pyq-detail-grid { display: grid; gap: 0.7rem; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 1rem 0; }
.pyq-detail-grid span, .pyq-library-notice {
    background: color-mix(in srgb, var(--white) 88%, var(--border)); border: 1px solid var(--border);
    border-radius: 6px; display: grid; padding: 0.8rem;
}
.pyq-detail-grid small { color: var(--gray); }

@media (max-width: 1100px) {
    .pyq-library-grid, .pyq-step-paper-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pyq-step-picklists { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pyq-repeat-controls { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 800px) {
    .pyq-library-hero, .pyq-library-layout { grid-template-columns: 1fr; }
    .pyq-step-flow-head { grid-template-columns: 1fr; }
    .pyq-step-crumbs { justify-content: flex-start; }
    .pyq-library-filters { position: static; }
    .pyq-repeat-controls, .pyq-repeat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
    .pyq-library-page { padding: 5.5rem 0.75rem 2rem; }
    .pyq-library-grid, .pyq-step-paper-grid, .pyq-step-picklists, .pyq-detail-grid, .pyq-repeat-controls, .pyq-repeat-grid { grid-template-columns: 1fr; }
    .pyq-step-grid, .pyq-step-card-selected { grid-column: auto; grid-template-columns: 1fr; }
    .pyq-library-toolbar, .pyq-repeat-head, .pyq-repeat-summary { align-items: stretch; flex-direction: column; }
    .pyq-step-actions .pyq-btn { width: 100%; }
    .pyq-repeat-summary span { text-align: left; }
    .pyq-repeat-metrics { grid-template-columns: 1fr; }
}

.nav-menu,
.header-actions,
.auth-container {
    flex-shrink: 0;
}

.hero,
.section-block,
.stats,
.ai-tools {
    scroll-margin-top: 96px;
}

.pyq-controls,
.video-controls,
.contact-form,
.contact-layout,
.footer-content {
    min-width: 0;
}

.pyq-controls label,
.video-controls label,
.contact-form label {
    min-width: 0;
}

.pyq-controls select,
.pyq-controls input,
.video-controls select,
.video-controls input,
.contact-form input,
.contact-form select,
.contact-form textarea {
    min-width: 0;
    width: 100%;
}

@media (max-width: 1280px) {
    .nav-container {
        padding-inline: 1rem;
    }

    .logo {
        font-size: 1.35rem;
    }

    .nav-menu a {
        font-size: 0.84rem;
        padding-inline: 0.62rem;
    }

    .mini-btn {
        padding-inline: 0.72rem;
    }
}

@media (max-width: 1080px) {
    .header {
        min-height: 74px;
    }

    .nav-container {
        min-height: 74px;
    }

    .nav-menu {
        max-height: calc(100vh - 6rem);
        overflow-y: auto;
    }

    .auth-container {
        max-height: calc(100vh - 6rem);
        overflow-y: auto;
    }

    .hero {
        margin-top: 86px;
    }
}

@media (max-width: 900px) {
    .nav-container {
        display: grid;
        grid-template-columns: auto 1fr auto;
    }

    .logo {
        min-width: 0;
    }

    .header-actions {
        justify-self: end;
    }

    .mobile-menu-toggle {
        justify-self: end;
    }
}

@media (max-width: 760px) {
    .container,
    .section-block,
    .stats {
        padding-inline: 0.9rem;
    }

    .hero {
        margin-inline: 0;
        min-height: auto;
        padding: 2.5rem 1rem;
    }

    .hero h1,
    .ai-lab-header h2,
    .branch-hero-panel h2,
    .section-heading h2,
    .pyq-header h2 {
        line-height: 1.05;
        overflow-wrap: anywhere;
    }

    .stats {
        gap: 0.75rem;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .stat-card {
        min-height: 126px;
        padding: 1rem;
    }

    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid,
    .pyq-grid,
    .video-grid,
    .lecture-grid {
        grid-template-columns: 1fr;
    }

    .ai-lab-section .ai-card {
        min-height: auto;
    }

    .branch-showcase .branch-card,
    .branch-showcase .branch-card:nth-child(1),
    .branch-showcase .branch-card:nth-child(2),
    .branch-showcase .branch-card:nth-child(3),
    .branch-showcase .branch-card:nth-child(4),
    .branch-showcase .branch-card:nth-child(5) {
        grid-template-columns: 72px minmax(0, 1fr);
    }

    .branch-showcase .sem-subjects {
        grid-template-columns: 1fr;
    }

    .pyq-hero,
    .pyq-results-bar,
    .branch-hero-panel,
    .ai-lab-header,
    .section-heading {
        grid-template-columns: 1fr;
    }

    .pyq-result-actions,
    .cta-buttons,
    .video-library-link {
        align-items: stretch;
        flex-direction: column;
    }

    .pyq-load-more,
    .video-btn,
    .cta-btn {
        justify-content: center;
        width: 100%;
    }

    .pyq-paper-top,
    .video-card-top {
        grid-template-columns: 1fr;
    }

    .pyq-image,
    .pyq-paper-top .pyq-image {
        width: 100%;
    }

    .contact-layout,
    .contact-form,
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding-inline: 0.75rem;
    }

    .logo {
        font-size: 1.05rem;
    }

    .theme-toggle,
    .mobile-menu-toggle {
        height: 38px;
        width: 38px;
    }

    .hero p,
    .section-heading p,
    .ai-lab-header p,
    .branch-hero-panel p,
    .pyq-header p {
        font-size: 0.92rem;
    }

    .stats {
        grid-template-columns: 1fr;
    }

    .branch-showcase .branch-card,
    .branch-showcase .branch-card:nth-child(1),
    .branch-showcase .branch-card:nth-child(2),
    .branch-showcase .branch-card:nth-child(3),
    .branch-showcase .branch-card:nth-child(4),
    .branch-showcase .branch-card:nth-child(5) {
        grid-template-columns: 1fr;
    }

    .branch-showcase .branch-image {
        border-radius: 14px 14px 0 0;
        min-height: 92px;
    }

    .pyq-score-row,
    .pyq-actions {
        grid-template-columns: 1fr;
    }

    .mini-modal-content,
    .tool-modal-content {
        margin-inline: 0.75rem;
        width: calc(100% - 1.5rem);
    }
}

/* Section refinement v30: compact branches and cleaner AI tools */
.ai-lab-section {
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--white) 96%, transparent), color-mix(in srgb, var(--light) 88%, transparent));
    padding: clamp(2.8rem, 6vw, 5.4rem) 0;
}

.ai-lab-section::before {
    opacity: 0.1;
}

.ai-lab-header {
    align-items: start;
    display: block;
    margin-bottom: 1.2rem;
    max-width: 980px;
}

.ai-lab-header h2 {
    font-size: clamp(2rem, 4.4vw, 4rem);
}

.ai-lab-header p {
    max-width: 760px;
}

.ai-lab-console {
    display: none;
}

.ai-lab-section .ai-grid {
    gap: 0.85rem;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.ai-lab-section .ai-card,
.ai-lab-section .ai-card:nth-child(1),
.ai-lab-section .ai-card:nth-child(6),
.ai-lab-section .ai-card:nth-child(11) {
    background: var(--white);
    border-radius: 18px;
    box-shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
    gap: 0.58rem;
    min-height: 220px;
    padding: 0.95rem;
}

.ai-lab-section .ai-card::before {
    height: 3px;
    left: 0.95rem;
    right: 0.95rem;
}

.ai-lab-section .ai-card::after {
    height: 54px;
    opacity: 0.18;
    width: 78px;
}

.ai-lab-section .ai-card:hover {
    box-shadow: 0 18px 44px rgba(15, 23, 42, 0.13);
    transform: translateY(-4px);
}

.ai-lab-section .ai-icon {
    border-radius: 14px;
    font-size: 1.05rem;
    height: 46px;
    width: 46px;
}

.ai-lab-section .ai-card h3 {
    font-size: 1.02rem;
}

.ai-lab-section .ai-card p {
    font-size: 0.82rem;
    line-height: 1.45;
}

.ai-lab-section .ai-card .login-btn {
    border-radius: 12px;
    font-size: 0.82rem;
    min-height: 38px;
    padding: 0.55rem 0.7rem;
}

.branch-showcase {
    margin-top: 4rem;
}

.branch-hero-panel {
    align-items: center;
    background:
        linear-gradient(135deg, #0b0b0b, #171717);
    border-radius: 22px;
    grid-template-columns: minmax(0, 1fr) auto;
    margin-bottom: 0.9rem;
    padding: clamp(1rem, 3vw, 1.45rem);
}

.branch-hero-panel h2 {
    font-size: clamp(1.75rem, 3.8vw, 3.15rem);
}

.branch-hero-panel p {
    font-size: 0.92rem;
    margin-top: 0.6rem;
}

.branch-showcase .branch-tab {
    font-size: 0.82rem;
    padding: 0.65rem 0.85rem;
}

.branch-showcase .branches-grid {
    gap: 0.72rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.branch-showcase .branch-card,
.branch-showcase .branch-card:nth-child(1),
.branch-showcase .branch-card:nth-child(2),
.branch-showcase .branch-card:nth-child(3),
.branch-showcase .branch-card:nth-child(4),
.branch-showcase .branch-card:nth-child(5) {
    border-radius: 14px;
    grid-template-columns: 82px minmax(0, 1fr);
    min-height: 126px;
}

.branch-showcase .branch-image {
    border-radius: 14px 0 0 14px;
    padding: 0.7rem;
}

.branch-showcase .branch-image i {
    border-radius: 12px;
    font-size: 1.15rem;
    height: 40px;
    width: 40px;
}

.branch-showcase .branch-image .rank {
    font-size: 0.65rem;
    max-width: 66px;
    padding: 0.3rem 0.45rem;
}

.branch-showcase .branch-content {
    gap: 0.52rem;
    padding: 0.75rem;
}

.branch-showcase .branch-content h3 {
    font-size: 0.94rem;
}

.branch-showcase .sem-subjects {
    gap: 0.35rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.branch-showcase .sem-row {
    border-radius: 9px;
    font-size: 0.68rem;
    line-height: 1.35;
    min-height: 0;
    padding: 0.38rem 0.45rem;
}

@media (max-width: 1180px) {
    .ai-lab-section .ai-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .branch-showcase .branches-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid,
    .branch-showcase .sem-subjects {
        grid-template-columns: 1fr;
    }

    .branch-hero-panel {
        grid-template-columns: 1fr;
    }

    .branch-showcase .branch-card,
    .branch-showcase .branch-card:nth-child(1),
    .branch-showcase .branch-card:nth-child(2),
    .branch-showcase .branch-card:nth-child(3),
    .branch-showcase .branch-card:nth-child(4),
    .branch-showcase .branch-card:nth-child(5) {
        grid-template-columns: 74px minmax(0, 1fr);
    }

    .branch-showcase .branch-image {
        border-radius: 14px 0 0 14px;
        min-height: 100%;
    }
}

/* AI tools + branches redesign */
.section-kicker {
    align-items: center;
    background: color-mix(in srgb, var(--dark) 9%, transparent);
    border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
    border-radius: 999px;
    color: var(--dark);
    display: inline-flex;
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 0.14em;
    padding: 0.45rem 0.7rem;
    text-transform: uppercase;
}

.ai-lab-section {
    background:
        radial-gradient(circle at 12% 16%, color-mix(in srgb, var(--primary) 16%, transparent), transparent 28rem),
        linear-gradient(135deg, color-mix(in srgb, var(--white) 94%, transparent), color-mix(in srgb, var(--light) 86%, transparent));
    border-block: 1px solid var(--border);
    overflow: hidden;
    padding: clamp(3rem, 7vw, 6.5rem) 0;
    position: relative;
}

.ai-lab-section::before {
    background-image: radial-gradient(color-mix(in srgb, var(--dark) 16%, transparent) 1px, transparent 1px);
    background-size: 18px 18px;
    content: "";
    inset: 0;
    opacity: 0.18;
    pointer-events: none;
    position: absolute;
}

.ai-lab-section .container {
    position: relative;
}

.ai-lab-header,
.branch-hero-panel {
    align-items: end;
    display: grid;
    gap: 1.25rem;
    grid-template-columns: minmax(0, 1fr) auto;
    margin-bottom: 1.4rem;
}

.ai-lab-header h2,
.branch-hero-panel h2 {
    color: var(--dark);
    font-size: clamp(2rem, 5vw, 4.8rem);
    letter-spacing: 0;
    line-height: 0.95;
    margin: 0.8rem 0 0;
    max-width: 960px;
}

.ai-lab-header p,
.branch-hero-panel p {
    color: var(--gray);
    font-size: clamp(0.95rem, 1.4vw, 1.08rem);
    margin-top: 1rem;
    max-width: 680px;
}

.ai-lab-console {
    background: #070707;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 22px;
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.22);
    color: white;
    display: grid;
    gap: 0.75rem;
    min-width: 270px;
    padding: 1.1rem;
}

.ai-lab-console span {
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    padding-bottom: 0.65rem;
}

.ai-lab-console span:last-child {
    border-bottom: 0;
    padding-bottom: 0;
}

.ai-lab-console strong {
    font-size: 1.35rem;
}

.ai-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
}

.ai-card {
    background:
        linear-gradient(145deg, color-mix(in srgb, var(--white) 90%, transparent), color-mix(in srgb, var(--light) 78%, transparent));
    border: 1px solid color-mix(in srgb, var(--border) 78%, transparent);
    border-radius: 26px;
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.1);
    display: grid;
    gap: 0.75rem;
    grid-column: span 3;
    grid-template-rows: auto auto 1fr auto;
    min-height: 255px;
    overflow: hidden;
    padding: 0.95rem;
    position: relative;
}

.ai-card::before {
    background: linear-gradient(90deg, var(--primary), var(--accent));
    content: "";
    height: 4px;
    left: 1.15rem;
    position: absolute;
    right: 1.15rem;
    top: 0;
}

.ai-card:nth-child(1),
.ai-card:nth-child(6),
.ai-card:nth-child(11) {
    background:
        radial-gradient(circle at 85% 16%, rgba(255, 255, 255, 0.16), transparent 11rem),
        #090909;
    color: white;
    grid-column: span 6;
}

.ai-card:hover {
    box-shadow: 0 28px 80px rgba(15, 23, 42, 0.16);
    transform: translateY(-6px);
}

.ai-icon {
    background: color-mix(in srgb, var(--primary) 10%, var(--white));
    border: 1px solid color-mix(in srgb, var(--primary) 18%, var(--border));
    border-radius: 18px;
    color: var(--primary);
    font-size: 1.25rem;
    height: 58px;
    width: 58px;
}

.ai-card h3 {
    color: inherit;
    font-size: 1.25rem;
    line-height: 1.15;
}

.ai-card p {
    color: var(--gray);
    font-size: 0.93rem;
}

.ai-card .login-btn {
    align-self: end;
    border-radius: 14px;
    justify-content: center;
    min-height: 44px;
    width: 100%;
}

.ai-tool-status {
    color: var(--gray);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0;
    text-transform: uppercase;
}

.ai-tool-modal {
    align-items: center;
    background: rgba(2, 6, 23, 0.72);
    display: none;
    inset: 0;
    justify-content: center;
    padding: 1rem;
    position: fixed;
    z-index: 2000;
}

.ai-tool-modal.open {
    display: flex;
}

.ai-tool-dialog {
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.28);
    display: grid;
    gap: 0.9rem;
    max-height: 94vh;
    max-width: 1120px;
    overflow: auto;
    padding: 1rem;
    width: min(1120px, 100%);
}

.ai-tool-top,
.ai-tool-prompt {
    align-items: center;
    display: flex;
    gap: 0.8rem;
    justify-content: space-between;
}

.ai-tool-frame {
    background: #020617;
    border-radius: 8px;
    min-height: min(64vh, 640px);
    overflow: hidden;
}

.ai-tool-frame iframe,
.ai-tool-frame video {
    border: 0;
    height: min(64vh, 640px);
    width: 100%;
}

.ai-tool-fallback {
    align-items: center;
    color: white;
    display: grid;
    gap: 0.5rem;
    min-height: 320px;
    place-items: center;
    text-align: center;
}

.ai-tool-fallback i {
    font-size: 2.5rem;
}

.ai-tool-fallback strong,
.ai-tool-fallback span,
.ai-tool-fallback small {
    max-width: 620px;
}

.ai-tool-fallback small {
    color: rgba(255, 255, 255, 0.68);
    display: block;
    font-size: 0.82rem;
    line-height: 1.5;
}

.ai-tool-fallback .video-btn {
    margin-top: 0.5rem;
}

.ai-empty-card {
    grid-column: 1 / -1;
    text-align: center;
}

.prompt-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.prompt-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 14px 40px rgba(15, 23, 42, 0.08);
    display: grid;
    gap: 0.75rem;
    padding: 1rem;
}

.prompt-card p {
    color: var(--gray);
}

.branch-showcase {
    position: relative;
}

.branch-hero-panel {
    background:
        linear-gradient(135deg, #070707, #191919 58%, color-mix(in srgb, var(--primary) 34%, #111));
    border-radius: 30px;
    box-shadow: 0 28px 90px rgba(15, 23, 42, 0.2);
    color: white;
    overflow: hidden;
    padding: clamp(1.2rem, 4vw, 2.3rem);
    position: relative;
}

.branch-hero-panel::after {
    background-image: radial-gradient(rgba(255, 255, 255, 0.22) 1px, transparent 1px);
    background-size: 18px 18px;
    content: "";
    inset: 0;
    opacity: 0.2;
    pointer-events: none;
    position: absolute;
}

.branch-hero-panel > * {
    position: relative;
    z-index: 1;
}

.branch-hero-panel .section-kicker {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.18);
    color: white;
}

.branch-hero-panel h2 {
    color: white;
}

.branch-hero-panel p {
    color: rgba(255, 255, 255, 0.72);
}

.branch-showcase .branch-tabs {
    justify-content: flex-end;
    margin: 0;
}

.branch-showcase .branch-tab {
    background: white;
    border: 0;
    border-radius: 999px;
    color: #0a0a0a;
    padding: 0.8rem 1rem;
}

.branches-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
}

.branch-card {
    background: color-mix(in srgb, var(--white) 88%, transparent);
    border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
    border-radius: 24px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.09);
    display: grid;
    grid-column: span 4;
    min-height: 315px;
    overflow: hidden;
    padding: 0;
}

.branch-card:nth-child(1),
.branch-card:nth-child(2),
.branch-card:nth-child(3) {
    grid-column: span 4;
}

.branch-card:nth-child(4),
.branch-card:nth-child(5) {
    grid-column: span 6;
}

.branch-card:hover {
    box-shadow: 0 30px 80px rgba(15, 23, 42, 0.16);
    transform: translateY(-6px);
}

.branch-image {
    align-items: start;
    border-radius: 0;
    display: flex;
    justify-content: space-between;
    margin: 0;
    min-height: 132px;
    padding: 1.1rem;
    position: relative;
}

.branch-image i {
    align-items: center;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 18px;
    display: inline-flex;
    font-size: 1.7rem;
    height: 58px;
    justify-content: center;
    width: 58px;
}

.branch-image .rank {
    backdrop-filter: blur(12px);
    background: rgba(0, 0, 0, 0.26);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 900;
    padding: 0.42rem 0.65rem;
}

.branch-content {
    display: grid;
    gap: 0.8rem;
    padding: 1.05rem;
}

.branch-content h3 {
    color: var(--dark);
    font-size: 1.15rem;
    line-height: 1.15;
}

.sem-subjects {
    display: grid;
    gap: 0.45rem;
}

.sem-row {
    background: color-mix(in srgb, var(--dark) 4%, transparent);
    border: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
    border-radius: 12px;
    color: var(--gray);
    font-size: 0.82rem;
    padding: 0.55rem 0.65rem;
}

.sem-row span {
    color: var(--dark);
    font-weight: 900;
}

@media (max-width: 1100px) {
    .ai-lab-header,
    .branch-hero-panel {
        align-items: stretch;
        grid-template-columns: 1fr;
    }

    .ai-card,
    .ai-card:nth-child(1),
    .ai-card:nth-child(6),
    .ai-card:nth-child(11),
    .branch-card,
    .branch-card:nth-child(4),
    .branch-card:nth-child(5) {
        grid-column: span 6;
    }
}

@media (max-width: 720px) {
    .ai-grid,
    .branches-grid {
        grid-template-columns: 1fr;
    }

    .ai-card,
    .ai-card:nth-child(1),
    .ai-card:nth-child(6),
    .ai-card:nth-child(11),
    .branch-card,
    .branch-card:nth-child(4),
    .branch-card:nth-child(5) {
        grid-column: 1;
    }

    .ai-lab-console {
        min-width: 0;
    }

    .branch-showcase .branch-tabs {
        justify-content: flex-start;
    }
}

/* Section refinement v29: equal AI cards, separate PYQ grid, new branch directory UI */
.ai-lab-section .ai-grid {
    grid-auto-rows: 1fr;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.ai-lab-section .ai-card,
.ai-lab-section .ai-card:nth-child(1),
.ai-lab-section .ai-card:nth-child(6),
.ai-lab-section .ai-card:nth-child(11) {
    background:
        linear-gradient(145deg, color-mix(in srgb, var(--white) 91%, transparent), color-mix(in srgb, var(--light) 80%, transparent));
    color: var(--dark);
    grid-column: auto;
    min-height: 270px;
}

.ai-lab-section .ai-card:nth-child(1) p,
.ai-lab-section .ai-card:nth-child(6) p,
.ai-lab-section .ai-card:nth-child(11) p {
    color: var(--gray);
}

.ai-lab-section .ai-card:nth-child(1) .ai-icon,
.ai-lab-section .ai-card:nth-child(6) .ai-icon,
.ai-lab-section .ai-card:nth-child(11) .ai-icon {
    background: color-mix(in srgb, var(--primary) 10%, var(--white));
    border-color: color-mix(in srgb, var(--primary) 18%, var(--border));
}

.ai-lab-section .ai-card::after {
    background-image: radial-gradient(color-mix(in srgb, var(--dark) 12%, transparent) 1px, transparent 1px);
    background-size: 13px 13px;
    bottom: 0.75rem;
    content: "";
    height: 72px;
    opacity: 0.28;
    pointer-events: none;
    position: absolute;
    right: 0.75rem;
    width: 104px;
}

.ai-lab-section .ai-card .login-btn {
    position: relative;
    z-index: 1;
}

.branch-showcase .branches-grid {
    display: grid;
    gap: 0.85rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.branch-showcase .branch-card,
.branch-showcase .branch-card:nth-child(1),
.branch-showcase .branch-card:nth-child(2),
.branch-showcase .branch-card:nth-child(3),
.branch-showcase .branch-card:nth-child(4),
.branch-showcase .branch-card:nth-child(5) {
    align-items: stretch;
    background:
        linear-gradient(90deg, color-mix(in srgb, var(--white) 92%, transparent), color-mix(in srgb, var(--light) 82%, transparent));
    border-radius: 18px;
    display: grid;
    grid-column: auto;
    grid-template-columns: 108px minmax(0, 1fr);
    min-height: 178px;
}

.branch-showcase .branch-card:hover {
    transform: translateX(6px);
}

.branch-showcase .branch-image {
    align-content: space-between;
    border-radius: 18px 0 0 18px;
    display: grid;
    min-height: 100%;
}

.branch-showcase .branch-image i {
    height: 52px;
    width: 52px;
}

.branch-showcase .branch-image .rank {
    justify-self: start;
    max-width: 84px;
    white-space: normal;
}

.branch-showcase .branch-content {
    align-content: start;
    padding: 1rem;
}

.branch-showcase .branch-content h3 {
    font-size: 1.05rem;
}

.branch-showcase .sem-subjects {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.branch-showcase .sem-row {
    font-size: 0.76rem;
    min-height: 52px;
}

.pyq-grid {
    align-items: start;
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(285px, 1fr));
}

.pyq-grid .pyq-card,
.pyq-grid .pyq-paper-card {
    align-self: start;
    grid-column: auto;
    min-height: 0;
    min-width: 0;
}

.pyq-grid .pyq-paper-card {
    gap: 0.65rem;
    height: auto;
    padding: 0.85rem;
}

.pyq-grid .pyq-paper-top > div:last-child {
    min-width: 0;
}

.pyq-grid .pyq-paper-top h4,
.pyq-grid .pyq-sems,
.pyq-grid .pyq-subjects {
    display: -webkit-box;
    overflow: hidden;
    overflow-wrap: anywhere;
    -webkit-box-orient: vertical;
}

.pyq-grid .pyq-paper-top h4 {
    font-size: 0.96rem;
    line-height: 1.3;
    margin: 0;
    -webkit-line-clamp: 2;
}

.pyq-grid .pyq-sems,
.pyq-grid .pyq-subjects {
    line-height: 1.45;
    -webkit-line-clamp: 2;
}

.pyq-grid .pyq-subjects {
    margin: 0;
}

.pyq-grid .pyq-score-row span {
    min-width: 0;
    padding: 0.45rem;
}

.pyq-grid .pyq-meta-list {
    margin: 0.15rem 0 0.35rem;
}

.pyq-grid .pyq-meta-list span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pyq-grid .pyq-actions {
    margin-top: 0.25rem;
}

.pyq-grid .lms-empty {
    grid-column: 1 / -1;
}

@media (max-width: 1180px) {
    .ai-lab-section .ai-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .branch-showcase .branches-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid,
    .branch-showcase .sem-subjects {
        grid-template-columns: 1fr;
    }

    .branch-showcase .branch-card,
    .branch-showcase .branch-card:nth-child(1),
    .branch-showcase .branch-card:nth-child(2),
    .branch-showcase .branch-card:nth-child(3),
    .branch-showcase .branch-card:nth-child(4),
    .branch-showcase .branch-card:nth-child(5) {
        grid-template-columns: 1fr;
    }

    .branch-showcase .branch-image {
        border-radius: 18px 18px 0 0;
        min-height: 118px;
    }
}

/* Nothing-inspired compact redesign for AI tools and all branches. */
.ai-lab-section {
    background:
        linear-gradient(180deg, #f7f7f4 0%, color-mix(in srgb, var(--white) 92%, transparent) 100%);
    border-block: 1px solid color-mix(in srgb, var(--dark) 10%, transparent);
    padding: clamp(2.6rem, 5vw, 4.8rem) 0;
}

[data-theme="dark"] .ai-lab-section {
    background:
        linear-gradient(180deg, #070707 0%, #111 100%);
}

.ai-lab-section::before {
    background-image: radial-gradient(color-mix(in srgb, var(--dark) 24%, transparent) 1px, transparent 1px);
    background-size: 14px 14px;
    opacity: 0.13;
}

.ai-lab-header {
    border-bottom: 1px solid color-mix(in srgb, var(--dark) 14%, transparent);
    display: block;
    margin-bottom: 1rem;
    max-width: none;
    padding-bottom: 1rem;
}

.ai-lab-header .section-kicker,
.branch-hero-panel .section-kicker {
    background: transparent;
    border-color: currentColor;
    border-radius: 999px;
    color: var(--dark);
    font-size: 0.66rem;
    padding: 0.35rem 0.58rem;
}

.ai-lab-header h2 {
    font-size: clamp(1.9rem, 4vw, 3.9rem);
    letter-spacing: 0;
    max-width: 860px;
}

.ai-lab-header p {
    font-size: 0.95rem;
    max-width: 680px;
}

.ai-lab-section .ai-grid {
    display: grid;
    gap: 0.72rem;
    grid-auto-rows: 1fr;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.ai-lab-section .ai-card,
.ai-lab-section .ai-card:nth-child(1),
.ai-lab-section .ai-card:nth-child(6),
.ai-lab-section .ai-card:nth-child(11) {
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--white) 88%, transparent), color-mix(in srgb, var(--light) 76%, transparent));
    border: 1px solid color-mix(in srgb, var(--dark) 12%, transparent);
    border-radius: 8px;
    box-shadow: none;
    color: var(--dark);
    gap: 0.48rem;
    grid-column: auto;
    min-height: 188px;
    padding: 0.82rem;
}

.ai-lab-section .ai-card::before {
    background: var(--dark);
    height: 2px;
    left: 0.82rem;
    right: auto;
    top: 0.82rem;
    width: 38px;
}

.ai-lab-section .ai-card::after {
    background-image: radial-gradient(currentColor 1px, transparent 1px);
    background-size: 10px 10px;
    bottom: 0.68rem;
    color: color-mix(in srgb, var(--dark) 22%, transparent);
    height: 46px;
    opacity: 0.5;
    right: 0.68rem;
    width: 68px;
}

.ai-lab-section .ai-card:hover {
    border-color: var(--dark);
    box-shadow: 0 18px 42px rgba(15, 23, 42, 0.11);
    transform: translateY(-3px);
}

.ai-lab-section .ai-icon,
.ai-lab-section .ai-card:nth-child(1) .ai-icon,
.ai-lab-section .ai-card:nth-child(6) .ai-icon,
.ai-lab-section .ai-card:nth-child(11) .ai-icon {
    background: var(--dark);
    border: 0;
    border-radius: 8px;
    color: var(--light);
    font-size: 0.95rem;
    height: 40px;
    width: 40px;
}

.ai-lab-section .ai-card h3 {
    font-size: 0.98rem;
    line-height: 1.15;
}

.ai-lab-section .ai-card p,
.ai-lab-section .ai-card:nth-child(1) p,
.ai-lab-section .ai-card:nth-child(6) p,
.ai-lab-section .ai-card:nth-child(11) p {
    color: var(--gray);
    font-size: 0.78rem;
    line-height: 1.42;
}

.ai-lab-section .ai-card .login-btn {
    background: transparent !important;
    border: 1px solid color-mix(in srgb, var(--dark) 22%, transparent);
    border-radius: 999px;
    color: var(--dark);
    font-size: 0.76rem;
    min-height: 34px;
    padding: 0.45rem 0.65rem;
}

.ai-lab-section .ai-card .login-btn:hover {
    background: var(--dark) !important;
    color: var(--light);
}

.branch-showcase {
    margin-top: clamp(2.6rem, 5vw, 4rem);
}

.branch-hero-panel {
    align-items: end;
    background: transparent;
    border-block: 1px solid color-mix(in srgb, var(--dark) 14%, transparent);
    border-radius: 0;
    box-shadow: none;
    color: var(--dark);
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 1fr) auto;
    margin-bottom: 0.9rem;
    padding: 1rem 0;
}

.branch-hero-panel::after {
    display: none;
}

.branch-hero-panel h2 {
    color: var(--dark);
    font-size: clamp(1.65rem, 3.4vw, 3rem);
}

.branch-hero-panel p {
    color: var(--gray);
    font-size: 0.9rem;
    margin-top: 0.45rem;
}

.branch-showcase .branch-tabs {
    justify-content: flex-start;
}

.branch-showcase .branch-tab {
    background: var(--dark);
    border-radius: 999px;
    color: var(--light);
    font-size: 0.72rem;
    padding: 0.52rem 0.74rem;
}

.branch-showcase .branches-grid {
    display: grid;
    gap: 0.55rem;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.branch-showcase .branch-card,
.branch-showcase .branch-card:nth-child(1),
.branch-showcase .branch-card:nth-child(2),
.branch-showcase .branch-card:nth-child(3),
.branch-showcase .branch-card:nth-child(4),
.branch-showcase .branch-card:nth-child(5) {
    background: color-mix(in srgb, var(--white) 88%, transparent);
    border: 1px solid color-mix(in srgb, var(--dark) 12%, transparent);
    border-radius: 8px;
    box-shadow: none;
    display: grid;
    grid-column: auto;
    grid-template-columns: 54px minmax(0, 1fr);
    min-height: 108px;
    overflow: hidden;
}

.branch-showcase .branch-card:hover {
    border-color: var(--dark);
    box-shadow: 0 14px 34px rgba(15, 23, 42, 0.1);
    transform: translateY(-2px);
}

.branch-showcase .branch-image {
    align-content: space-between;
    border-radius: 0;
    display: grid;
    margin: 0;
    min-height: 100%;
    padding: 0.5rem;
}

.branch-showcase .branch-image i {
    background: rgba(255, 255, 255, 0.18);
    border-radius: 7px;
    font-size: 0.92rem;
    height: 30px;
    width: 30px;
}

.branch-showcase .branch-image .rank {
    background: rgba(0, 0, 0, 0.28);
    border-radius: 999px;
    font-size: 0.56rem;
    line-height: 1.1;
    max-width: 44px;
    padding: 0.22rem 0.3rem;
}

.branch-showcase .branch-content {
    gap: 0.36rem;
    padding: 0.58rem;
}

.branch-showcase .branch-content h3 {
    font-size: 0.82rem;
    line-height: 1.12;
}

.branch-showcase .sem-subjects {
    gap: 0.26rem;
    grid-template-columns: 1fr;
}

.branch-showcase .sem-row {
    background: transparent;
    border: 0;
    border-top: 1px solid color-mix(in srgb, var(--dark) 10%, transparent);
    border-radius: 0;
    color: var(--gray);
    font-size: 0.6rem;
    line-height: 1.28;
    min-height: 0;
    padding: 0.25rem 0 0;
}

.branch-showcase .sem-row:nth-child(n+3) {
    display: none;
}

@media (max-width: 1180px) {
    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 820px) {
    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .branch-hero-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 520px) {
    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid {
        grid-template-columns: 1fr;
    }

    .ai-lab-section .ai-card {
        min-height: 168px;
    }

    .branch-showcase .branch-card,
    .branch-showcase .branch-card:nth-child(1),
    .branch-showcase .branch-card:nth-child(2),
    .branch-showcase .branch-card:nth-child(3),
    .branch-showcase .branch-card:nth-child(4),
    .branch-showcase .branch-card:nth-child(5) {
        grid-template-columns: 50px minmax(0, 1fr);
    }
}

/* Undo v32 branch redesign: restore the previous compact branch directory UI. */
.branch-showcase {
    margin-top: 4rem;
}

.branch-hero-panel {
    align-items: center;
    background:
        linear-gradient(135deg, #0b0b0b, #171717);
    border: 0;
    border-radius: 22px;
    box-shadow: 0 28px 90px rgba(15, 23, 42, 0.2);
    color: white;
    display: grid;
    gap: 1.25rem;
    grid-template-columns: minmax(0, 1fr) auto;
    margin-bottom: 0.9rem;
    overflow: hidden;
    padding: clamp(1rem, 3vw, 1.45rem);
}

.branch-hero-panel::after {
    background-image: radial-gradient(rgba(255, 255, 255, 0.22) 1px, transparent 1px);
    background-size: 18px 18px;
    content: "";
    display: block;
    inset: 0;
    opacity: 0.2;
    pointer-events: none;
    position: absolute;
}

.branch-hero-panel .section-kicker {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.18);
    color: white;
}

.branch-hero-panel h2 {
    color: white;
    font-size: clamp(1.75rem, 3.8vw, 3.15rem);
}

.branch-hero-panel p {
    color: rgba(255, 255, 255, 0.72);
    font-size: 0.92rem;
    margin-top: 0.6rem;
}

.branch-showcase .branch-tabs {
    justify-content: flex-end;
}

.branch-showcase .branch-tab {
    background: white;
    border: 0;
    border-radius: 999px;
    color: #0a0a0a;
    font-size: 0.82rem;
    padding: 0.65rem 0.85rem;
}

.branch-showcase .branches-grid {
    gap: 0.72rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.branch-showcase .branch-card,
.branch-showcase .branch-card:nth-child(1),
.branch-showcase .branch-card:nth-child(2),
.branch-showcase .branch-card:nth-child(3),
.branch-showcase .branch-card:nth-child(4),
.branch-showcase .branch-card:nth-child(5) {
    background:
        linear-gradient(90deg, color-mix(in srgb, var(--white) 92%, transparent), color-mix(in srgb, var(--light) 82%, transparent));
    border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
    border-radius: 14px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.09);
    display: grid;
    grid-column: auto;
    grid-template-columns: 82px minmax(0, 1fr);
    min-height: 126px;
    text-decoration: none;
    color: inherit;
}

.branch-showcase .branch-card:hover {
    box-shadow: 0 30px 80px rgba(15, 23, 42, 0.16);
    transform: translateX(6px);
}

.branch-showcase .branch-image {
    align-content: space-between;
    border-radius: 14px 0 0 14px;
    display: grid;
    min-height: 100%;
    padding: 0.7rem;
}

.branch-showcase .branch-image i {
    background: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 12px;
    font-size: 1.15rem;
    height: 40px;
    width: 40px;
}

.branch-showcase .branch-image .rank {
    background: rgba(0, 0, 0, 0.26);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    font-size: 0.65rem;
    max-width: 66px;
    padding: 0.3rem 0.45rem;
}

.branch-showcase .branch-content {
    gap: 0.52rem;
    padding: 0.75rem;
}

.branch-showcase .branch-content h3 {
    font-size: 0.94rem;
}

.branch-showcase .sem-subjects {
    gap: 0.35rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.branch-showcase .sem-row {
    background: color-mix(in srgb, var(--dark) 4%, transparent);
    border: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
    border-radius: 9px;
    color: var(--gray);
    display: block;
    font-size: 0.68rem;
    line-height: 1.35;
    min-height: 0;
    padding: 0.38rem 0.45rem;
}

@media (max-width: 1180px) {
    .branch-showcase .branches-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .branch-hero-panel {
        grid-template-columns: 1fr;
    }

    .branch-showcase .branches-grid,
    .branch-showcase .sem-subjects {
        grid-template-columns: 1fr;
    }

    .branch-showcase .branch-card,
    .branch-showcase .branch-card:nth-child(1),
    .branch-showcase .branch-card:nth-child(2),
    .branch-showcase .branch-card:nth-child(3),
    .branch-showcase .branch-card:nth-child(4),
    .branch-showcase .branch-card:nth-child(5) {
        grid-template-columns: 74px minmax(0, 1fr);
    }

    .branch-showcase .branch-image {
        border-radius: 14px 0 0 14px;
        min-height: 100%;
    }
}

/* Branch detail hub */
.branch-detail-page {
    background:
        radial-gradient(circle at 15% 5%, color-mix(in srgb, var(--primary) 12%, transparent), transparent 28rem),
        linear-gradient(180deg, color-mix(in srgb, var(--light) 92%, transparent), var(--white));
    min-height: 100vh;
    padding: 7.5rem 5% 4rem;
}

.branch-detail-hero {
    align-items: stretch;
    background:
        linear-gradient(135deg, #080808, #171717 60%, #262626);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 24px;
    box-shadow: 0 34px 100px rgba(15, 23, 42, 0.22);
    color: white;
    display: grid;
    gap: 1.5rem;
    grid-template-columns: minmax(0, 1fr) minmax(220px, 320px);
    margin: 0 auto 1rem;
    max-width: 1240px;
    overflow: hidden;
    padding: clamp(1.2rem, 4vw, 2.4rem);
    position: relative;
}

.branch-detail-hero::after {
    background-image: radial-gradient(rgba(255, 255, 255, 0.24) 1px, transparent 1px);
    background-size: 18px 18px;
    content: "";
    inset: 0;
    opacity: 0.18;
    pointer-events: none;
    position: absolute;
}

.branch-detail-hero > * {
    position: relative;
    z-index: 1;
}

.branch-back-link {
    color: rgba(255, 255, 255, 0.72);
    display: inline-flex;
    gap: 0.45rem;
    margin-bottom: 1rem;
    text-decoration: none;
}

.branch-detail-hero .pyq-kicker {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.16);
    color: white;
}

.branch-detail-hero h1 {
    color: white;
    font-size: clamp(2rem, 5vw, 4.2rem);
    letter-spacing: 0;
    line-height: 1.02;
    margin: 0.9rem 0;
}

.branch-detail-hero p {
    color: rgba(255, 255, 255, 0.74);
    max-width: 760px;
}

.branch-detail-actions,
.branch-section-head {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.branch-detail-actions {
    margin-top: 1.2rem;
}

.branch-detail-stats {
    align-content: stretch;
    display: grid;
    gap: 0.7rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.branch-detail-stats span {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 18px;
    color: rgba(255, 255, 255, 0.7);
    display: grid;
    min-height: 92px;
    padding: 1rem;
}

.branch-detail-stats strong {
    color: white;
    display: block;
    font-size: clamp(1.5rem, 4vw, 2.4rem);
}

.branch-detail-layout {
    display: grid;
    gap: 1rem;
    grid-template-columns: 290px minmax(0, 1fr);
    margin: 0 auto;
    max-width: 1240px;
}

.branch-detail-content {
    display: grid;
    gap: 1rem;
    min-width: 0;
}

.branch-detail-panel {
    background: color-mix(in srgb, var(--white) 94%, transparent);
    border: 1px solid color-mix(in srgb, var(--border) 78%, transparent);
    border-radius: 20px;
    box-shadow: 0 22px 70px rgba(15, 23, 42, 0.08);
    padding: clamp(1rem, 2.5vw, 1.35rem);
}

.branch-filter-panel {
    align-self: start;
    display: grid;
    gap: 0.9rem;
    position: sticky;
    top: 92px;
}

.branch-filter-panel h2,
.branch-section-head h2 {
    color: var(--dark);
    margin: 0;
}

.branch-filter-panel label {
    color: var(--gray);
    display: grid;
    font-size: 0.82rem;
    font-weight: 600;
    gap: 0.35rem;
}

.branch-filter-panel select,
.branch-filter-panel input {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--dark);
    min-height: 44px;
    padding: 0.7rem 0.85rem;
}

.branch-section-head {
    justify-content: space-between;
    margin-bottom: 1rem;
}

.branch-section-head p {
    color: var(--gray);
    font-size: 0.9rem;
    margin: 0;
}

.branch-semester-grid,
.branch-resource-grid {
    display: grid;
    gap: 0.85rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.branch-semester-card,
.branch-resource-card {
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--white) 96%, transparent), color-mix(in srgb, var(--light) 78%, transparent));
    border: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
    border-radius: 16px;
    min-width: 0;
    padding: 1rem;
}

.branch-semester-card strong,
.branch-resource-card h3 {
    color: var(--dark);
}

.branch-semester-card div {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-top: 0.8rem;
}

.branch-semester-card span {
    background: color-mix(in srgb, var(--dark) 5%, transparent);
    border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
    border-radius: 999px;
    color: var(--gray);
    font-size: 0.74rem;
    padding: 0.35rem 0.55rem;
}

.branch-resource-card {
    display: grid;
    gap: 0.65rem;
}

.branch-resource-card > span {
    color: var(--gray);
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
}

.branch-resource-card h3 {
    font-size: 1rem;
    line-height: 1.28;
    margin: 0;
}

.branch-resource-card p {
    color: var(--gray);
    font-size: 0.84rem;
    line-height: 1.55;
    margin: 0;
}

.branch-resource-icon {
    align-items: center;
    background: #0b0b0b;
    border-radius: 14px;
    color: white;
    display: inline-flex;
    height: 42px;
    justify-content: center;
    width: 42px;
}

.branch-resource-card .pyq-btn {
    justify-self: start;
    margin-top: 0.2rem;
}

.branch-resource-card button[disabled] {
    cursor: not-allowed;
    opacity: 0.6;
}

@media (max-width: 1020px) {
    .branch-detail-hero,
    .branch-detail-layout {
        grid-template-columns: 1fr;
    }

    .branch-filter-panel {
        position: static;
    }

    .branch-semester-grid,
    .branch-resource-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 620px) {
    .branch-detail-page {
        padding: 6.5rem 1rem 3rem;
    }

    .branch-detail-stats,
    .branch-semester-grid,
    .branch-resource-grid {
        grid-template-columns: 1fr;
    }

    .branch-detail-hero,
    .branch-detail-panel {
        border-radius: 18px;
    }
}

/* v36: redesigned AI tools and branch sections */
.ai-lab-section {
    background:
        linear-gradient(180deg, #050505, #111 58%, #f6f7fb 58%),
        radial-gradient(circle at 16% 12%, rgba(255, 255, 255, 0.16), transparent 22rem);
    color: white;
    margin-top: 4rem;
    overflow: hidden;
    padding: clamp(3rem, 7vw, 5.6rem) 0;
    position: relative;
}

.ai-lab-section::before {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 32px 32px;
    content: "";
    inset: 0;
    opacity: 0.45;
    pointer-events: none;
    position: absolute;
}

.ai-lab-section .container {
    position: relative;
    z-index: 1;
}

.ai-lab-header {
    align-items: end;
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 760px) minmax(190px, 1fr);
    margin-bottom: 1.4rem;
}

.ai-lab-header::after {
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 20px;
    color: rgba(255, 255, 255, 0.68);
    content: "16 tools / coding / research / writing / compilers";
    font-size: 0.82rem;
    justify-self: end;
    max-width: 260px;
    padding: 1rem;
    text-transform: uppercase;
}

.ai-lab-header .section-kicker {
    background: rgba(255, 255, 255, 0.09);
    border-color: rgba(255, 255, 255, 0.16);
    color: white;
}

.ai-lab-header h2 {
    color: white;
    font-size: clamp(2rem, 5vw, 4rem);
    letter-spacing: 0;
    line-height: 1.02;
    margin: 0.85rem 0;
}

.ai-lab-header p {
    color: rgba(255, 255, 255, 0.68);
    max-width: 660px;
}

.ai-lab-section .ai-grid {
    display: grid;
    gap: 0.9rem;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.ai-lab-section .ai-card,
.ai-lab-section .ai-card:nth-child(1),
.ai-lab-section .ai-card:nth-child(6),
.ai-lab-section .ai-card:nth-child(11) {
    align-content: space-between;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(246, 247, 251, 0.92));
    border: 1px solid rgba(15, 23, 42, 0.1);
    border-radius: 18px;
    box-shadow: 0 24px 70px rgba(15, 23, 42, 0.14);
    color: #101010;
    display: grid;
    min-height: 230px;
    overflow: hidden;
    padding: 1rem;
    position: relative;
}

.ai-lab-section .ai-card::before {
    background-image: radial-gradient(rgba(0, 0, 0, 0.16) 1px, transparent 1px);
    background-size: 13px 13px;
    content: "";
    inset: 0;
    opacity: 0.18;
    pointer-events: none;
    position: absolute;
}

.ai-lab-section .ai-card::after {
    background: #101010;
    border-radius: 999px;
    color: white;
    content: "OPEN";
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0;
    padding: 0.32rem 0.52rem;
    position: absolute;
    right: 0.9rem;
    top: 0.9rem;
}

.ai-lab-section .ai-card:hover {
    border-color: rgba(0, 0, 0, 0.34);
    box-shadow: 0 34px 90px rgba(0, 0, 0, 0.22);
    transform: translateY(-7px);
}

.ai-lab-section .ai-icon,
.ai-lab-section .ai-card:nth-child(1) .ai-icon,
.ai-lab-section .ai-card:nth-child(6) .ai-icon,
.ai-lab-section .ai-card:nth-child(11) .ai-icon {
    align-items: center;
    background: #0d0d0d;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    color: white;
    display: flex;
    height: 52px;
    justify-content: center;
    margin-bottom: 1.4rem;
    position: relative;
    width: 52px;
    z-index: 1;
}

.ai-lab-section .ai-card h3 {
    color: #101010;
    font-size: 1.02rem;
    position: relative;
}

.ai-lab-section .ai-card p,
.ai-lab-section .ai-card:nth-child(1) p,
.ai-lab-section .ai-card:nth-child(6) p,
.ai-lab-section .ai-card:nth-child(11) p {
    color: #5f6673;
    font-size: 0.82rem;
    line-height: 1.52;
    min-height: 3.75rem;
    position: relative;
}

.ai-lab-section .ai-card .login-btn {
    background: #101010 !important;
    border: 1px solid #101010;
    border-radius: 999px;
    color: white;
    font-size: 0.78rem;
    justify-content: center;
    margin-top: 1rem;
    min-height: 38px;
    position: relative;
    width: 100%;
    z-index: 1;
}

.ai-lab-section .ai-card .login-btn:hover {
    background: white !important;
    color: #101010;
}

.branch-showcase {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(245, 247, 251, 0.96));
    border: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
    border-radius: 30px;
    box-shadow: 0 30px 90px rgba(15, 23, 42, 0.08);
    margin-top: 3.5rem;
    padding: clamp(1rem, 3vw, 1.35rem);
}

.branch-hero-panel {
    background:
        linear-gradient(135deg, #ffffff, #f5f6f8);
    border: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
    border-radius: 24px;
    box-shadow: none;
    color: var(--dark);
    margin-bottom: 1rem;
    padding: clamp(1.1rem, 3vw, 1.65rem);
    position: relative;
}

.branch-hero-panel::after {
    background-image: radial-gradient(rgba(0, 0, 0, 0.14) 1px, transparent 1px);
    background-size: 15px 15px;
    opacity: 0.18;
}

.branch-hero-panel .section-kicker {
    background: #101010;
    border-color: #101010;
    color: white;
}

.branch-hero-panel h2 {
    color: #101010;
    font-size: clamp(1.8rem, 4vw, 3.4rem);
    letter-spacing: 0;
}

.branch-hero-panel p {
    color: #5f6673;
}

.branch-showcase .branch-tab {
    background: #101010;
    color: white;
}

.branch-showcase .branches-grid {
    display: grid;
    gap: 0.82rem;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.branch-showcase .branch-card,
.branch-showcase .branch-card:nth-child(1),
.branch-showcase .branch-card:nth-child(2),
.branch-showcase .branch-card:nth-child(3),
.branch-showcase .branch-card:nth-child(4),
.branch-showcase .branch-card:nth-child(5) {
    background: white;
    border: 1px solid color-mix(in srgb, var(--border) 78%, transparent);
    border-radius: 18px;
    box-shadow: none;
    color: inherit;
    display: grid;
    grid-template-columns: 1fr;
    min-height: 238px;
    overflow: hidden;
    text-decoration: none;
}

.branch-showcase .branch-card:hover {
    border-color: rgba(0, 0, 0, 0.34);
    box-shadow: 0 24px 70px rgba(15, 23, 42, 0.14);
    transform: translateY(-6px);
}

.branch-showcase .branch-image {
    align-items: center;
    border-radius: 0;
    display: flex;
    justify-content: space-between;
    min-height: 72px;
    padding: 0.85rem;
}

.branch-showcase .branch-image i {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    height: 42px;
    width: 42px;
}

.branch-showcase .branch-image .rank {
    font-size: 0.66rem;
    max-width: none;
}

.branch-showcase .branch-content {
    display: grid;
    gap: 0.7rem;
    padding: 0.9rem;
}

.branch-showcase .branch-content h3 {
    color: var(--dark);
    font-size: 0.96rem;
    line-height: 1.25;
}

.branch-showcase .sem-subjects {
    display: grid;
    gap: 0.34rem;
    grid-template-columns: 1fr;
}

.branch-showcase .sem-row {
    background: #f6f7f9;
    border: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
    border-radius: 10px;
    color: #5f6673;
    display: block;
    font-size: 0.65rem;
    line-height: 1.34;
    padding: 0.38rem 0.45rem;
}

.branch-showcase .sem-row:nth-child(n+3) {
    display: block;
}

@media (max-width: 1180px) {
    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 820px) {
    .ai-lab-header {
        grid-template-columns: 1fr;
    }

    .ai-lab-header::after {
        justify-self: start;
    }

    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .ai-lab-section {
        padding: 3rem 0;
    }

    .ai-lab-section .ai-grid,
    .branch-showcase .branches-grid {
        grid-template-columns: 1fr;
    }

    .ai-lab-section .ai-card {
        min-height: 205px;
    }

    .branch-showcase {
        border-radius: 22px;
        padding: 0.75rem;
    }

    .branch-showcase .branch-card,
    .branch-showcase .branch-card:nth-child(1),
    .branch-showcase .branch-card:nth-child(2),
    .branch-showcase .branch-card:nth-child(3),
    .branch-showcase .branch-card:nth-child(4),
    .branch-showcase .branch-card:nth-child(5) {
        min-height: 0;
    }
}

/* v37: AI tools command-center redesign */
.ai-lab-section {
    background:
        linear-gradient(135deg, #f7f8fb 0%, #ffffff 42%, #eef1f6 100%);
    color: var(--dark);
    margin-top: 4rem;
    overflow: hidden;
    padding: clamp(3.2rem, 7vw, 5.8rem) 0;
    position: relative;
}

.ai-lab-section::before {
    background:
        radial-gradient(circle at 18% 14%, rgba(0, 0, 0, 0.08), transparent 22rem),
        radial-gradient(circle at 82% 20%, rgba(37, 99, 235, 0.11), transparent 20rem),
        radial-gradient(rgba(0, 0, 0, 0.18) 1px, transparent 1px);
    background-size: auto, auto, 18px 18px;
    content: "";
    inset: 0;
    opacity: 0.42;
    pointer-events: none;
    position: absolute;
}

.ai-lab-section .container {
    position: relative;
    z-index: 1;
}

.ai-lab-header {
    align-items: end;
    background: #0b0b0d;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 28px;
    box-shadow: 0 34px 100px rgba(15, 23, 42, 0.18);
    color: white;
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 1fr) minmax(210px, 310px);
    margin-bottom: 1rem;
    overflow: hidden;
    padding: clamp(1.2rem, 4vw, 2rem);
    position: relative;
}

.ai-lab-header::before {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 26px 26px;
    content: "";
    inset: 0;
    opacity: 0.45;
    pointer-events: none;
    position: absolute;
}

.ai-lab-header::after {
    align-self: stretch;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.05));
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 22px;
    color: rgba(255, 255, 255, 0.78);
    content: "AI launchpad\A instant tools\A no extra setup";
    display: grid;
    font-size: 0.8rem;
    line-height: 1.7;
    padding: 1rem;
    text-transform: uppercase;
    white-space: pre-line;
}

.ai-lab-header > div {
    position: relative;
    z-index: 1;
}

.ai-lab-header .section-kicker {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.16);
    color: white;
}

.ai-lab-header h2 {
    color: white;
    font-size: clamp(2rem, 5vw, 4.4rem);
    letter-spacing: 0;
    line-height: 1;
    margin: 0.9rem 0;
    max-width: 820px;
}

.ai-lab-header p {
    color: rgba(255, 255, 255, 0.72);
    max-width: 720px;
}

.section-ai-heading {
    margin-bottom: 1.25rem;
}

.section-ai-heading::after {
    content: attr(data-panel);
}

.section-ai-heading .pyq-kicker {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 999px;
    color: white;
    display: inline-flex;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0;
    padding: 0.35rem 0.75rem;
}

.ai-lab-section .ai-grid {
    display: grid;
    gap: 0.72rem;
    grid-template-columns: repeat(8, minmax(0, 1fr));
}

.ai-lab-section .ai-card,
.ai-lab-section .ai-card:nth-child(1),
.ai-lab-section .ai-card:nth-child(6),
.ai-lab-section .ai-card:nth-child(11) {
    align-content: start;
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid rgba(15, 23, 42, 0.1);
    border-radius: 20px;
    box-shadow: 0 18px 48px rgba(15, 23, 42, 0.08);
    color: #101010;
    display: grid;
    gap: 0.62rem;
    min-height: 198px;
    overflow: hidden;
    padding: 0.85rem;
    position: relative;
}

.ai-lab-section .ai-card:nth-child(1),
.ai-lab-section .ai-card:nth-child(2),
.ai-lab-section .ai-card:nth-child(7),
.ai-lab-section .ai-card:nth-child(8) {
    grid-column: span 2;
}

.ai-lab-section .ai-card:nth-child(3),
.ai-lab-section .ai-card:nth-child(4),
.ai-lab-section .ai-card:nth-child(5),
.ai-lab-section .ai-card:nth-child(6),
.ai-lab-section .ai-card:nth-child(n+9) {
    grid-column: span 2;
}

.ai-lab-section .ai-card::before {
    background:
        linear-gradient(135deg, rgba(0, 0, 0, 0.08), transparent 42%),
        radial-gradient(rgba(0, 0, 0, 0.18) 1px, transparent 1px);
    background-size: auto, 12px 12px;
    content: "";
    inset: 0;
    opacity: 0.16;
    pointer-events: none;
    position: absolute;
}

.ai-lab-section .ai-card::after {
    background: transparent;
    border: 1px solid rgba(15, 23, 42, 0.18);
    border-radius: 999px;
    color: #101010;
    content: "Tool";
    font-size: 0.62rem;
    font-weight: 700;
    padding: 0.26rem 0.5rem;
    position: absolute;
    right: 0.75rem;
    top: 0.75rem;
}

.ai-lab-section .ai-card:hover {
    background: #101010;
    border-color: #101010;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.2);
    color: white;
    transform: translateY(-6px);
}

.ai-lab-section .ai-icon,
.ai-lab-section .ai-card:nth-child(1) .ai-icon,
.ai-lab-section .ai-card:nth-child(6) .ai-icon,
.ai-lab-section .ai-card:nth-child(11) .ai-icon {
    align-items: center;
    background: #101010;
    border-radius: 16px;
    color: white;
    display: flex;
    font-size: 1.05rem;
    height: 46px;
    justify-content: center;
    margin: 0 0 0.45rem;
    position: relative;
    width: 46px;
    z-index: 1;
}

.ai-lab-section .ai-card h3 {
    color: inherit;
    font-size: 1rem;
    line-height: 1.2;
    margin: 0;
    position: relative;
}

.ai-lab-section .ai-card p,
.ai-lab-section .ai-card:nth-child(1) p,
.ai-lab-section .ai-card:nth-child(6) p,
.ai-lab-section .ai-card:nth-child(11) p {
    color: #626a76;
    font-size: 0.78rem;
    line-height: 1.48;
    min-height: 3.45rem;
    position: relative;
}

.ai-lab-section .ai-card:hover p {
    color: rgba(255, 255, 255, 0.72);
}

.ai-lab-section .ai-card:hover::after {
    border-color: rgba(255, 255, 255, 0.25);
    color: white;
}

.ai-lab-section .ai-card:hover .ai-icon {
    background: white;
    color: #101010;
}

.ai-lab-section .ai-card .login-btn {
    align-items: center;
    background: #101010 !important;
    border: 1px solid #101010;
    border-radius: 999px;
    color: white;
    display: inline-flex;
    font-size: 0.76rem;
    justify-content: center;
    margin-top: auto;
    min-height: 36px;
    padding: 0.55rem 0.75rem;
    position: relative;
    width: 100%;
    z-index: 1;
}

.ai-lab-section .ai-card:hover .login-btn {
    background: white !important;
    border-color: white;
    color: #101010;
}

.ai-lab-section .ai-card .ai-icon,
.ai-lab-section .ai-card:nth-child(1) .ai-icon,
.ai-lab-section .ai-card:nth-child(6) .ai-icon,
.ai-lab-section .ai-card:nth-child(11) .ai-icon {
    background: #101010;
    color: white;
}

.ai-lab-section .ai-card .login-btn {
    background: #101010 !important;
    border-color: #101010;
    color: white;
}

.ai-lab-section .ai-card:hover {
    background: #d71920;
    border-color: #d71920;
    box-shadow: 0 30px 80px rgba(215, 25, 32, 0.3);
    color: white;
}

.ai-lab-section .ai-card:hover .ai-icon,
.ai-lab-section .ai-card:hover .login-btn {
    background: #d71920 !important;
    border-color: #d71920;
    color: white;
}

.ai-lab-section .ai-card .login-btn,
.ai-lab-section .ai-card .login-btn:visited,
.ai-lab-section .ai-card .login-btn:focus,
.ai-lab-section .ai-card .login-btn:focus-visible {
    background: #101010 !important;
    border-color: #101010 !important;
    color: #ffffff !important;
    text-decoration: none !important;
}

.ai-lab-section .ai-card .login-btn i {
    color: inherit !important;
}

.ai-lab-section .ai-card:hover .login-btn,
.ai-lab-section .ai-card .login-btn:hover {
    background: #d71920 !important;
    border-color: #d71920 !important;
    color: #ffffff !important;
}

.ai-lab-section .ai-card .ai-icon,
.ai-lab-section .ai-card:nth-child(1) .ai-icon,
.ai-lab-section .ai-card:nth-child(2) .ai-icon,
.ai-lab-section .ai-card:nth-child(3) .ai-icon,
.ai-lab-section .ai-card:nth-child(4) .ai-icon,
.ai-lab-section .ai-card:nth-child(5) .ai-icon,
.ai-lab-section .ai-card:nth-child(6) .ai-icon,
.ai-lab-section .ai-card:nth-child(7) .ai-icon,
.ai-lab-section .ai-card:nth-child(8) .ai-icon,
.ai-lab-section .ai-card:nth-child(11) .ai-icon,
.ai-lab-section .ai-card:nth-child(n+9) .ai-icon {
    background: #101010 !important;
    color: #ffffff !important;
}

.ai-lab-section .ai-card:hover .ai-icon,
.ai-lab-section .ai-card .ai-icon:hover {
    background: #d71920 !important;
    color: #ffffff !important;
}

[data-theme="dark"] .ai-lab-section .ai-card,
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(1),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(2),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(3),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(4),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(5),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(6),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(7),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(8),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(11),
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(n+9) {
    background: rgba(255, 255, 255, 0.92) !important;
    border-color: rgba(255, 255, 255, 0.14) !important;
    color: #101010 !important;
}

[data-theme="dark"] .ai-lab-section .ai-card h3 {
    color: #101010 !important;
}

[data-theme="dark"] .ai-lab-section .ai-card p,
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(1) p,
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(2) p,
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(6) p,
[data-theme="dark"] .ai-lab-section .ai-card:nth-child(11) p {
    color: #626a76 !important;
}

[data-theme="dark"] .ai-lab-section .ai-card .ai-tool-status {
    color: #626a76 !important;
}

[data-theme="dark"] .ai-lab-section .ai-card::after {
    border-color: rgba(15, 23, 42, 0.18) !important;
    color: #101010 !important;
}

[data-theme="dark"] .ai-lab-section .ai-card .ai-icon,
[data-theme="dark"] .ai-lab-section .ai-card .login-btn {
    background: #101010 !important;
    border-color: #101010 !important;
    color: #ffffff !important;
}

[data-theme="dark"] .ai-lab-section .ai-card:hover {
    background: #d71920 !important;
    border-color: #d71920 !important;
    color: #ffffff !important;
}

[data-theme="dark"] .ai-lab-section .ai-card:hover h3,
[data-theme="dark"] .ai-lab-section .ai-card:hover p,
[data-theme="dark"] .ai-lab-section .ai-card:hover .ai-tool-status,
[data-theme="dark"] .ai-lab-section .ai-card:hover::after {
    color: #ffffff !important;
}

[data-theme="dark"] .ai-lab-section .ai-card:hover .ai-icon,
[data-theme="dark"] .ai-lab-section .ai-card:hover .login-btn,
[data-theme="dark"] .ai-lab-section .ai-card .login-btn:hover {
    background: #d71920 !important;
    border-color: #d71920 !important;
    color: #ffffff !important;
}

/* Keep every old AI tool card identical; overrides earlier nth-child feature-card rules. */
.ai-lab-section .ai-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)) !important;
}

.ai-lab-section .ai-card,
.ai-lab-section .ai-card:nth-child(1),
.ai-lab-section .ai-card:nth-child(2),
.ai-lab-section .ai-card:nth-child(3),
.ai-lab-section .ai-card:nth-child(4),
.ai-lab-section .ai-card:nth-child(5),
.ai-lab-section .ai-card:nth-child(6),
.ai-lab-section .ai-card:nth-child(7),
.ai-lab-section .ai-card:nth-child(8),
.ai-lab-section .ai-card:nth-child(11),
.ai-lab-section .ai-card:nth-child(n+9) {
    grid-column: auto !important;
    min-height: 210px !important;
}

.ai-lab-section .ai-card:nth-child(1) p,
.ai-lab-section .ai-card:nth-child(2) p,
.ai-lab-section .ai-card:nth-child(6) p,
.ai-lab-section .ai-card:nth-child(11) p {
    color: #626a76 !important;
}

.ai-lab-section .ai-card:hover p,
.ai-lab-section .ai-card:nth-child(1):hover p,
.ai-lab-section .ai-card:nth-child(2):hover p,
.ai-lab-section .ai-card:nth-child(6):hover p,
.ai-lab-section .ai-card:nth-child(11):hover p {
    color: rgba(255, 255, 255, 0.72) !important;
}

@media (max-width: 1120px) {
    .ai-lab-section .ai-grid {
        grid-template-columns: repeat(6, minmax(0, 1fr));
    }

    .ai-lab-section .ai-card,
    .ai-lab-section .ai-card:nth-child(1),
    .ai-lab-section .ai-card:nth-child(2),
    .ai-lab-section .ai-card:nth-child(3),
    .ai-lab-section .ai-card:nth-child(4),
    .ai-lab-section .ai-card:nth-child(5),
    .ai-lab-section .ai-card:nth-child(6),
    .ai-lab-section .ai-card:nth-child(7),
    .ai-lab-section .ai-card:nth-child(8),
    .ai-lab-section .ai-card:nth-child(n+9) {
        grid-column: span 2;
    }
}

@media (max-width: 780px) {
    .ai-lab-header {
        grid-template-columns: 1fr;
    }

    .ai-lab-section .ai-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .ai-lab-section .ai-card,
    .ai-lab-section .ai-card:nth-child(1),
    .ai-lab-section .ai-card:nth-child(2),
    .ai-lab-section .ai-card:nth-child(3),
    .ai-lab-section .ai-card:nth-child(4),
    .ai-lab-section .ai-card:nth-child(5),
    .ai-lab-section .ai-card:nth-child(6),
    .ai-lab-section .ai-card:nth-child(7),
    .ai-lab-section .ai-card:nth-child(8),
    .ai-lab-section .ai-card:nth-child(n+9) {
        grid-column: span 1;
    }
}

@media (max-width: 520px) {
    .ai-lab-section {
        padding: 2.6rem 0;
    }

    .ai-lab-header {
        border-radius: 22px;
    }

    .ai-lab-section .ai-grid {
        grid-template-columns: 1fr;
    }

    .ai-lab-section .ai-card {
        min-height: 0;
    }
}

/* AI tools section polish */
.ai-lab-header::after {
    content: "AI tools\A inside website\A no redirects";
}

.ai-lab-section .ai-card {
    backdrop-filter: blur(18px);
}

.ai-lab-section .ai-card:nth-child(4n) .ai-icon {
    background: #d71920;
    color: white;
}

.ai-lab-section .ai-card:nth-child(4n):hover .login-btn {
    background: #d71920 !important;
    border-color: #d71920;
    color: white;
}

/* Final mobile/header visibility fixes */
.video-btn,
.video-btn:visited,
.video-library-link .video-btn {
    color: var(--light) !important;
}

.video-btn.secondary,
.video-btn.ghost {
    color: var(--dark) !important;
}

[data-theme="dark"] .video-btn,
[data-theme="dark"] .video-btn:visited,
[data-theme="dark"] .video-library-link .video-btn {
    background: #ffffff !important;
    border-color: #ffffff !important;
    color: #111111 !important;
}

[data-theme="dark"] .video-btn:hover,
[data-theme="dark"] .video-library-link .video-btn:hover {
    background: #d71920 !important;
    border-color: #d71920 !important;
    color: #ffffff !important;
}

[data-theme="dark"] .contact-socials a {
    background: #ffffff !important;
    border-color: #ffffff !important;
    color: #111111 !important;
    box-shadow: 0 10px 28px rgba(255, 255, 255, 0.14) !important;
}

[data-theme="dark"] .contact-socials a:hover,
[data-theme="dark"] .contact-socials a:focus-visible {
    background: #d71920 !important;
    border-color: #d71920 !important;
    color: #ffffff !important;
}

[data-theme="dark"] .video-badge,
[data-theme="dark"] .video-badge.inline {
    background: #ffffff !important;
    border-color: #ffffff !important;
    color: #111111 !important;
}

@media (max-width: 900px) {
    .header {
        padding: 0.55rem 0.65rem;
    }

    .nav-container {
        align-items: center;
        display: grid !important;
        grid-template-columns: minmax(0, 1fr) auto auto auto;
        gap: 0.5rem;
        min-height: 62px;
        padding: 0.55rem 0.65rem;
    }

    .logo {
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .nav-menu {
        grid-column: 1 / -1;
        left: 0.75rem !important;
        right: 0.75rem !important;
        top: 4.7rem !important;
    }

    .header-actions,
    .auth-container,
    .mobile-menu-toggle {
        align-items: center;
        align-self: center;
        display: inline-flex;
        justify-self: end;
        margin: 0 !important;
        position: static !important;
        transform: none !important;
    }

    .auth-container {
        max-height: none !important;
        overflow: visible !important;
    }

    .theme-toggle,
    .mobile-menu-toggle,
    .mini-btn {
        min-height: 40px;
    }
}

@media (max-width: 520px) {
    .nav-container {
        grid-template-columns: minmax(0, 1fr) 40px 40px 46px;
    }

    .theme-toggle,
    .mobile-menu-toggle {
        height: 38px;
        width: 38px;
    }

    .mini-btn {
        height: 38px;
        min-width: 42px;
        padding: 0;
    }

    .mini-btn i {
        margin: 0;
    }

    .login-mini {
        font-size: 0;
    }

    .login-mini i {
        font-size: 0.95rem;
    }
}

/* Homepage PYQ most repeated questions panel */
.pyq-repeat-home-card {
    background: color-mix(in srgb, var(--white) 94%, #fff7d6);
    border: 1px solid color-mix(in srgb, var(--primary) 24%, var(--border));
    grid-column: span 2;
    min-height: 430px;
}

.pyq-repeat-home-head h3 {
    color: var(--dark);
    font-size: clamp(1rem, 1.45vw, 1.35rem);
    margin: 0.35rem 0 0;
}

.pyq-repeat-home-controls {
    display: grid;
    gap: 0.5rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin: 0.8rem 0;
}

.pyq-repeat-home-controls label {
    color: var(--gray);
    display: grid;
    font-size: 0.68rem;
    font-weight: 800;
    gap: 0.25rem;
}

.pyq-repeat-home-controls select {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--dark);
    font: inherit;
    font-size: 0.72rem;
    min-height: 36px;
    padding: 0.45rem;
    width: 100%;
}

.pyq-repeat-question-list {
    display: grid;
    gap: 0.5rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-height: 282px;
    overflow-y: auto;
    padding-right: 0.25rem;
}

.pyq-repeat-question {
    background: var(--light);
    border: 1px solid var(--border);
    border-radius: 10px;
    display: grid;
    gap: 0.32rem;
    padding: 0.65rem;
}

.pyq-repeat-question strong {
    color: var(--dark);
    font-size: 0.78rem;
    line-height: 1.35;
}

.pyq-repeat-question strong i { color: #f59e0b; }

.pyq-repeat-question span {
    color: var(--primary);
    font-size: 0.7rem;
    font-weight: 900;
}

.pyq-repeat-question small {
    color: var(--gray);
    font-size: 0.68rem;
    font-weight: 700;
}

.pyq-repeat-all-btn {
    margin-top: 0.8rem;
    width: 100%;
}

[data-theme="dark"] .pyq-repeat-home-card,
body[data-theme="dark"] .pyq-repeat-home-card {
    background: color-mix(in srgb, var(--white) 86%, #171100);
}

@media (max-width: 900px) {
    .pyq-repeat-home-card { grid-column: span 1; }
    .pyq-repeat-home-controls,
    .pyq-repeat-question-list { grid-template-columns: 1fr; }
    .pyq-repeat-question-list { max-height: none; }
}
/* v66: two-column repeated-question CTA with the same row height as PYQ cards */
.pyq-grid .pyq-repeat-cta-card {
    align-content: start;
    align-items: stretch;
    align-self: stretch !important;
    background: var(--white) !important;
    border-color: color-mix(in srgb, #10b981 34%, var(--border)) !important;
    box-shadow: 0 10px 32px rgba(15, 23, 42, 0.08);
    display: grid;
    gap: 0.8rem;
    grid-column: span 2 !important;
    justify-content: stretch;
    min-height: 0;
    overflow: hidden;
    padding: 1rem;
}

.pyq-repeat-cta-top {
    align-items: start;
    display: flex;
    gap: 0.75rem;
}

.pyq-repeat-mini-icon {
    align-items: center;
    background: var(--dark);
    border-radius: 999px;
    color: var(--light);
    display: inline-flex;
    flex: 0 0 42px;
    height: 42px;
    justify-content: center;
    width: 42px;
}

.pyq-repeat-cta-top h3 {
    color: var(--dark);
    font-size: clamp(1.05rem, 1.8vw, 1.45rem);
    line-height: 1.1;
    margin: 0.35rem 0 0.25rem;
}

.pyq-repeat-cta-top p {
    color: var(--gray);
    font-size: 0.8rem;
    line-height: 1.45;
}

.pyq-repeat-cta-stats {
    display: grid;
    gap: 0.5rem;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.pyq-repeat-cta-stats span,
.pyq-repeat-cta-list span {
    background: var(--light);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--gray);
    display: grid;
    font-size: 0.68rem;
    font-weight: 800;
    gap: 0.1rem;
    min-width: 0;
    padding: 0.55rem;
}

.pyq-repeat-cta-stats strong {
    color: var(--dark);
    font-size: 0.75rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pyq-repeat-cta-list {
    display: grid;
    gap: 0.45rem;
}

.pyq-repeat-cta-list span {
    grid-template-columns: auto minmax(0, 1fr);
}

.pyq-repeat-cta-list i {
    color: #f59e0b;
    grid-row: span 2;
    margin-top: 0.15rem;
}

.pyq-repeat-cta-list strong {
    color: var(--dark);
    font-size: 0.72rem;
    line-height: 1.3;
}

.pyq-repeat-cta-list small {
    color: var(--gray);
    font-size: 0.66rem;
}

.pyq-grid .pyq-repeat-cta-card .pyq-repeat-all-btn {
    font-size: 0.95rem;
    line-height: 1.25;
    margin-top: auto;
    min-height: 54px;
    white-space: normal;
    width: 100%;
}

.pyq-library-actions {
    display: grid;
    gap: 0.5rem;
    grid-template-columns: repeat(auto-fit, minmax(116px, 1fr));
    margin-top: auto;
}

.pyq-library-actions .pyq-btn {
    border: 0;
    cursor: pointer;
    justify-content: center;
    min-height: 42px;
    text-align: center;
}

.pyq-viewer-dialog {
    background: transparent;
    border: 0;
    max-width: min(1180px, 96vw);
    padding: 0;
    width: min(1180px, 96vw);
}

.pyq-viewer-dialog::backdrop {
    background: rgba(2, 6, 23, 0.78);
    backdrop-filter: blur(10px);
}

.pyq-viewer-shell {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 34px 90px rgba(2, 6, 23, 0.32);
    color: var(--dark);
    display: grid;
    gap: 0.8rem;
    max-height: 92vh;
    overflow: hidden;
    padding: 1rem;
}

.pyq-viewer-top {
    align-items: start;
    display: flex;
    gap: 1rem;
    justify-content: space-between;
}

.pyq-viewer-top h2 {
    color: var(--dark);
    font-size: clamp(1rem, 2.4vw, 1.35rem);
    line-height: 1.2;
    margin: 0.25rem 0;
}

.pyq-viewer-top p {
    color: var(--gray);
    font-size: 0.78rem;
    margin: 0;
}

.pyq-viewer-frame-wrap {
    background: #0b0b0d;
    border-radius: 14px;
    min-height: min(72vh, 760px);
    overflow: hidden;
    position: relative;
}

.pyq-viewer-frame {
    border: 0;
    display: block;
    height: min(72vh, 760px);
    width: 100%;
}

.pyq-speed-stat {
    grid-column: span 2;
}

.pyq-speed-stat strong {
    color: #10b981 !important;
}

[data-theme="dark"] .pyq-viewer-shell,
body[data-theme="dark"] .pyq-viewer-shell {
    background: #101010;
    border-color: rgba(255, 255, 255, 0.16);
}

[data-theme="dark"] .pyq-viewer-top h2,
body[data-theme="dark"] .pyq-viewer-top h2 {
    color: #fff;
}

[data-theme="dark"] .pyq-grid .pyq-repeat-cta-card,
body[data-theme="dark"] .pyq-grid .pyq-repeat-cta-card {
    background: #101010 !important;
    border-color: rgba(255, 255, 255, 0.16) !important;
}

/* v69: keep PYQ paper and repeated-question card sides aligned. */
.pyq-grid {
    align-items: stretch !important;
    grid-auto-rows: minmax(430px, auto);
}

.pyq-grid .pyq-card,
.pyq-grid .pyq-paper-card,
.pyq-grid .pyq-repeat-cta-card {
    align-self: stretch !important;
    height: 100%;
    min-height: 430px;
}

.pyq-grid .pyq-paper-card,
.pyq-grid .pyq-repeat-cta-card {
    display: grid;
}

.pyq-grid .pyq-paper-card .pyq-actions,
.pyq-grid .pyq-repeat-cta-card .pyq-repeat-all-btn {
    margin-top: auto;
}

@media (max-width: 900px) {
    .pyq-grid .pyq-repeat-cta-card {
        grid-column: span 1 !important;
        min-height: 0;
    }

    .pyq-repeat-cta-stats {
        grid-template-columns: 1fr;
    }
}

/* v70: keep all PYQ/repeated cards in the same row height. */
.pyq-grid {
    align-items: stretch !important;
    grid-auto-rows: 1fr !important;
}

.pyq-grid .pyq-card,
.pyq-grid .pyq-paper-card,
.pyq-grid .pyq-repeat-cta-card {
    align-self: stretch !important;
    display: flex !important;
    flex-direction: column;
    height: 100% !important;
}

.pyq-grid .pyq-actions,
.pyq-grid .pyq-library-actions,
.pyq-grid .pyq-repeat-all-btn {
    margin-top: auto !important;
}
/* v64: match Branch, Video, PYQ, and Contact banners to the black AI study banner */
#branches .branch-hero-panel,
#videos .section-heading,
#pyq .pyq-hero,
#contact .section-heading {
    align-items: end;
    background: #0b0b0d !important;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 28px;
    box-shadow: 0 34px 100px rgba(15, 23, 42, 0.18);
    color: #fff;
    display: grid;
    gap: 1rem;
    grid-template-columns: minmax(0, 1fr);
    margin-bottom: 1rem;
    overflow: hidden;
    padding: clamp(1.2rem, 4vw, 2rem);
    position: relative;
    text-align: left;
}

#branches .branch-hero-panel::after,
#videos .section-heading::after,
#pyq .pyq-hero::after,
#contact .section-heading::after {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 26px 26px;
    content: "";
    inset: 0;
    opacity: 0.45;
    pointer-events: none;
    position: absolute;
    z-index: 0;
}

#branches .branch-hero-panel > div,
#videos .section-heading > *,
#pyq .pyq-hero > div,
#contact .section-heading > * {
    position: relative;
    z-index: 1;
}

#branches .branch-hero-panel .section-kicker,
#pyq .pyq-hero .pyq-kicker,
#videos .section-heading::before,
#contact .section-heading::before {
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 999px;
    color: #fff;
    display: inline-flex;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0;
    padding: 0.35rem 0.75rem;
    position: relative;
    text-transform: uppercase;
    width: max-content;
    z-index: 1;
}

#videos .section-heading::before {
    content: "Video Library";
}

#contact .section-heading::before {
    content: "Support Desk";
}

#branches .branch-hero-panel h2,
#videos .section-heading h2,
#pyq .pyq-hero h2,
#contact .section-heading h2 {
    color: #fff !important;
    font-size: clamp(2rem, 5vw, 4.4rem);
    letter-spacing: 0;
    line-height: 1;
    margin: 0.9rem 0;
    max-width: 820px;
}

#branches .branch-hero-panel p,
#videos .section-heading p,
#pyq .pyq-hero p,
#contact .section-heading p {
    color: rgba(255, 255, 255, 0.72) !important;
    font-size: clamp(0.9rem, 1.2vw, 1rem);
    line-height: 1.55;
    margin: 0;
    max-width: 720px;
}

#branches .branch-tabs,
#pyq .pyq-hero-stats {
    display: none !important;
}

[data-theme="dark"] #branches .branch-hero-panel,
[data-theme="dark"] #videos .section-heading,
[data-theme="dark"] #pyq .pyq-hero,
[data-theme="dark"] #contact .section-heading,
body[data-theme="dark"] #branches .branch-hero-panel,
body[data-theme="dark"] #videos .section-heading,
body[data-theme="dark"] #pyq .pyq-hero,
body[data-theme="dark"] #contact .section-heading {
    background: #0b0b0d !important;
}

@media (max-width: 560px) {
    #branches .branch-hero-panel,
    #videos .section-heading,
    #pyq .pyq-hero,
    #contact .section-heading {
        border-radius: 20px;
        padding: 1rem;
    }

    #branches .branch-hero-panel h2,
    #videos .section-heading h2,
    #pyq .pyq-hero h2,
    #contact .section-heading h2 {
        font-size: clamp(2rem, 12vw, 3rem);
    }
}


/* v67: professional PYQ library and repeated-priority polish */
.pyq-library-page {
    max-width: 1560px;
    padding: clamp(5.8rem, 8vw, 7.4rem) clamp(1rem, 3vw, 2rem) 4rem;
}

.pyq-library-hero {
    background: #0b0b0d;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 28px;
    box-shadow: 0 34px 100px rgba(15, 23, 42, 0.18);
    grid-template-columns: minmax(0, 1fr) minmax(220px, 0.32fr);
    isolation: isolate;
    min-height: clamp(180px, 19vw, 265px);
    overflow: hidden;
    position: relative;
}

.pyq-library-hero::before {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 26px 26px;
    content: "";
    inset: 0;
    opacity: 0.46;
    pointer-events: none;
    position: absolute;
    z-index: -1;
}

.pyq-library-hero .pyq-kicker {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.16);
    color: #fff;
}

.pyq-library-hero h1 {
    font-size: clamp(2.1rem, 4.8vw, 4.8rem);
    letter-spacing: 0;
    line-height: 0.98;
    max-width: 980px;
}

.pyq-library-hero p {
    color: rgba(255, 255, 255, 0.72);
    font-size: clamp(0.92rem, 1.2vw, 1.08rem);
    line-height: 1.65;
}

.pyq-library-stats span {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.14);
    border-radius: 18px;
    min-height: 92px;
}

.pyq-step-flow,
.pyq-repeat-panel,
.pyq-step-papers,
.pyq-library-filters,
.pyq-library-toolbar,
.pyq-library-card {
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 24px;
    box-shadow: 0 22px 70px rgba(17, 24, 39, 0.1);
}

.pyq-step-flow {
    padding: clamp(1rem, 2.3vw, 1.45rem);
}

.pyq-step-flow-head {
    align-items: end;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    padding-bottom: 1rem;
}

.pyq-step-flow-head h2,
.pyq-repeat-title h2,
.pyq-library-toolbar h2 {
    color: var(--dark);
    font-weight: 900;
    letter-spacing: 0;
}

.pyq-step-flow-head h2 {
    font-size: clamp(1.55rem, 3vw, 2.6rem);
}

.pyq-step-crumbs a,
.pyq-step-picklists,
.pyq-step-card,
.pyq-repeat-card,
.pyq-library-card,
.pyq-detail-dialog {
    border-radius: 22px;
}

.pyq-step-crumbs a {
    min-height: 42px;
    padding: 0.5rem 0.8rem;
}

.pyq-step-picklists {
    background: rgba(17, 24, 39, 0.035);
    border: 1px solid rgba(0, 0, 0, 0.08);
    margin: 1rem 0;
    padding: 0.85rem;
}

.pyq-step-picklists select,
.pyq-library-filters select,
.pyq-library-filters input,
.pyq-repeat-controls select {
    border-radius: 16px;
    min-height: 48px;
}

.pyq-step-card,
.pyq-repeat-card,
.pyq-library-card {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 16px 48px rgba(17, 24, 39, 0.08);
    padding: 1.05rem;
}

.pyq-step-card:hover,
.pyq-library-card:hover,
.pyq-repeat-card:hover {
    border-color: rgba(17, 24, 39, 0.28);
    box-shadow: 0 24px 70px rgba(17, 24, 39, 0.14);
    transform: translateY(-3px);
}

.pyq-step-card h3,
.pyq-library-card h3,
.pyq-repeat-card h3 {
    font-weight: 900;
    letter-spacing: 0;
}

.pyq-step-card p,
.pyq-library-card p,
.pyq-repeat-title p,
.pyq-repeat-card > p,
.pyq-step-papers-head p,
.pyq-library-toolbar p {
    line-height: 1.55;
}

.pyq-step-index,
.pyq-code,
.pyq-repeat-rank,
.pyq-repeat-unit,
.pyq-year {
    border-radius: 999px;
    font-weight: 900;
    letter-spacing: 0;
}

.pyq-step-index,
.pyq-code,
.pyq-repeat-rank {
    background: #0f172a;
    border-color: #0f172a;
    color: #fff;
}

.pyq-year,
.pyq-repeat-unit {
    background: rgba(17, 24, 39, 0.06);
    color: #111827;
}

.pyq-step-meta span,
.pyq-repeat-metrics span,
.pyq-library-meta span,
.pyq-detail-grid span,
.pyq-library-notice {
    border-radius: 14px;
}

.pyq-repeat-panel {
    padding: clamp(1rem, 2.4vw, 1.35rem);
}

.pyq-repeat-icon,
.pyq-repeat-reset {
    border-radius: 16px;
}

.pyq-repeat-controls {
    background: rgba(17, 24, 39, 0.035);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 20px;
    padding: 0.85rem;
}

.pyq-repeat-summary {
    border-radius: 18px;
    padding: 0.8rem 0.95rem;
}

.pyq-repeat-grid,
.pyq-library-grid,
.pyq-step-paper-grid {
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
}

.pyq-btn,
.pyq-load-more {
    border-radius: 999px;
    font-weight: 900;
    min-height: 44px;
}

.pyq-btn:hover,
.pyq-load-more:hover {
    background: #d71920;
    border-color: #d71920;
    color: #fff;
}

.pyq-btn.secondary:hover {
    background: #0f172a;
    border-color: #0f172a;
    color: #fff;
}

[data-theme="dark"] .pyq-step-flow,
[data-theme="dark"] .pyq-repeat-panel,
[data-theme="dark"] .pyq-step-papers,
[data-theme="dark"] .pyq-library-filters,
[data-theme="dark"] .pyq-library-toolbar,
[data-theme="dark"] .pyq-library-card,
[data-theme="dark"] .pyq-step-card,
[data-theme="dark"] .pyq-repeat-card,
body[data-theme="dark"] .pyq-step-flow,
body[data-theme="dark"] .pyq-repeat-panel,
body[data-theme="dark"] .pyq-step-papers,
body[data-theme="dark"] .pyq-library-filters,
body[data-theme="dark"] .pyq-library-toolbar,
body[data-theme="dark"] .pyq-library-card,
body[data-theme="dark"] .pyq-step-card,
body[data-theme="dark"] .pyq-repeat-card {
    background: rgba(18, 18, 18, 0.82);
    border-color: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .pyq-step-flow-head h2,
[data-theme="dark"] .pyq-repeat-title h2,
[data-theme="dark"] .pyq-library-toolbar h2,
[data-theme="dark"] .pyq-step-card h3,
[data-theme="dark"] .pyq-library-card h3,
[data-theme="dark"] .pyq-repeat-card h3,
[data-theme="dark"] .pyq-step-meta strong,
[data-theme="dark"] .pyq-repeat-metrics strong,
body[data-theme="dark"] .pyq-step-flow-head h2,
body[data-theme="dark"] .pyq-repeat-title h2,
body[data-theme="dark"] .pyq-library-toolbar h2,
body[data-theme="dark"] .pyq-step-card h3,
body[data-theme="dark"] .pyq-library-card h3,
body[data-theme="dark"] .pyq-repeat-card h3,
body[data-theme="dark"] .pyq-step-meta strong,
body[data-theme="dark"] .pyq-repeat-metrics strong {
    color: #fff;
}

[data-theme="dark"] .pyq-step-picklists,
[data-theme="dark"] .pyq-repeat-controls,
[data-theme="dark"] .pyq-step-meta span,
[data-theme="dark"] .pyq-repeat-metrics span,
[data-theme="dark"] .pyq-repeat-summary,
body[data-theme="dark"] .pyq-step-picklists,
body[data-theme="dark"] .pyq-repeat-controls,
body[data-theme="dark"] .pyq-step-meta span,
body[data-theme="dark"] .pyq-repeat-metrics span,
body[data-theme="dark"] .pyq-repeat-summary {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .pyq-step-picklists select,
[data-theme="dark"] .pyq-library-filters select,
[data-theme="dark"] .pyq-library-filters input,
[data-theme="dark"] .pyq-repeat-controls select,
body[data-theme="dark"] .pyq-step-picklists select,
body[data-theme="dark"] .pyq-library-filters select,
body[data-theme="dark"] .pyq-library-filters input,
body[data-theme="dark"] .pyq-repeat-controls select {
    background: rgba(12, 12, 12, 0.96);
    border-color: rgba(255, 255, 255, 0.14);
    color: #fff;
}

[data-theme="dark"] .pyq-step-card p,
[data-theme="dark"] .pyq-library-card p,
[data-theme="dark"] .pyq-repeat-title p,
[data-theme="dark"] .pyq-repeat-card > p,
[data-theme="dark"] .pyq-step-papers-head p,
[data-theme="dark"] .pyq-library-toolbar p,
body[data-theme="dark"] .pyq-step-card p,
body[data-theme="dark"] .pyq-library-card p,
body[data-theme="dark"] .pyq-repeat-title p,
body[data-theme="dark"] .pyq-repeat-card > p,
body[data-theme="dark"] .pyq-step-papers-head p,
body[data-theme="dark"] .pyq-library-toolbar p {
    color: rgba(255, 255, 255, 0.72);
}

@media (max-width: 900px) {
    .pyq-library-hero {
        grid-template-columns: 1fr;
    }

    .pyq-library-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {
    .pyq-library-hero,
    .pyq-step-flow,
    .pyq-repeat-panel {
        border-radius: 20px;
    }

    .pyq-library-stats,
    .pyq-repeat-metrics {
        grid-template-columns: 1fr;
    }
}

/* v75: Branch section Nothing UI redesign only. No data, links, or behavior changed. */
#branches.branch-showcase {
    --branch-ink: #080808;
    --branch-paper: rgba(255, 255, 255, 0.94);
    --branch-soft: #f6f6f3;
    --branch-line: rgba(8, 8, 8, 0.14);
    --branch-muted: #646464;
    --branch-red: #ed1c24;
    background:
        radial-gradient(circle, rgba(8, 8, 8, 0.13) 1px, transparent 1.4px) 0 0 / 18px 18px,
        linear-gradient(180deg, rgba(255, 255, 255, 0.78), rgba(246, 246, 243, 0.84));
    border: 1px solid var(--branch-line);
    border-radius: clamp(22px, 3vw, 38px);
    box-shadow: 0 24px 70px rgba(8, 8, 8, 0.08);
    overflow: hidden;
    padding: clamp(1rem, 2vw, 1.6rem);
}

#branches.branch-showcase .branch-hero-panel {
    align-items: end;
    background:
        linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(135deg, #050505 0%, #111111 62%, #241111 100%);
    background-size: 42px 42px, 42px 42px, auto;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: clamp(20px, 2.4vw, 32px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 18px 60px rgba(8, 8, 8, 0.16);
    color: #ffffff;
    display: grid;
    gap: 1.25rem;
    grid-template-columns: minmax(0, 1fr) auto;
    margin-bottom: clamp(1rem, 2vw, 1.45rem);
    overflow: hidden;
    padding: clamp(1.15rem, 3vw, 2.2rem);
    position: relative;
}

#branches.branch-showcase .branch-hero-panel::after {
    background: var(--branch-red);
    border-radius: 999px;
    box-shadow: 0 0 22px rgba(237, 28, 36, 0.65);
    content: "";
    height: 8px;
    position: absolute;
    right: clamp(1rem, 2vw, 1.6rem);
    top: clamp(1rem, 2vw, 1.6rem);
    width: 8px;
}

#branches.branch-showcase .branch-hero-panel .section-kicker {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: #ffffff;
}

#branches.branch-showcase .branch-hero-panel h2 {
    color: #ffffff;
    font-size: clamp(2.2rem, 6vw, 5.6rem);
    letter-spacing: 0;
    line-height: 0.92;
    margin: 0.65rem 0 0;
    max-width: 980px;
    text-transform: uppercase;
}

#branches.branch-showcase .branch-hero-panel p {
    color: rgba(255, 255, 255, 0.76);
    font-size: clamp(1rem, 1.6vw, 1.35rem);
    line-height: 1.45;
    margin-top: 0.9rem;
    max-width: 780px;
}

#branches.branch-showcase .branch-tabs {
    align-self: end;
}

#branches.branch-showcase .branch-tab {
    background: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.38);
    border-radius: 999px;
    color: #080808;
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    padding: 0.72rem 1rem;
    text-transform: uppercase;
    white-space: nowrap;
}

#branches.branch-showcase .branches-grid {
    align-items: start !important;
    display: grid !important;
    gap: clamp(0.9rem, 1.4vw, 1.2rem) !important;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 270px), 1fr)) !important;
}

#branches.branch-showcase .branch-card,
#branches.branch-showcase .branch-card:nth-child(n) {
    align-self: start !important;
    background:
        linear-gradient(var(--branch-paper), var(--branch-paper)) padding-box,
        linear-gradient(145deg, rgba(8, 8, 8, 0.2), rgba(255, 255, 255, 0.7)) border-box !important;
    border: 1px solid transparent !important;
    border-radius: 20px !important;
    box-shadow: 0 18px 42px rgba(8, 8, 8, 0.08) !important;
    color: var(--branch-ink) !important;
    display: flex !important;
    flex-direction: column !important;
    gap: 0 !important;
    grid-column: auto !important;
    height: auto !important;
    justify-content: flex-start !important;
    min-height: 0 !important;
    overflow: hidden !important;
    padding: 0 !important;
    position: relative;
    text-decoration: none !important;
}

#branches.branch-showcase .branch-card::after {
    background: var(--branch-red);
    border-radius: 999px;
    content: "";
    height: 7px;
    opacity: 0;
    position: absolute;
    right: 14px;
    top: 14px;
    transform: scale(0.7);
    transition: opacity 0.2s ease, transform 0.2s ease;
    width: 7px;
}

#branches.branch-showcase .branch-card:hover {
    border-color: rgba(8, 8, 8, 0.34) !important;
    box-shadow: 0 26px 70px rgba(8, 8, 8, 0.14) !important;
    transform: translateY(-4px);
}

#branches.branch-showcase .branch-card:hover::after {
    opacity: 1;
    transform: scale(1);
}

#branches.branch-showcase .branch-image {
    align-items: flex-start !important;
    background:
        radial-gradient(circle, rgba(255, 255, 255, 0.12) 1px, transparent 1.5px) 0 0 / 15px 15px,
        linear-gradient(135deg, #080808 0%, #1a1a1a 66%, #2a1111 100%) !important;
    border: 0 !important;
    border-radius: 0 !important;
    display: flex !important;
    flex: 0 0 auto !important;
    justify-content: space-between !important;
    margin: 0 !important;
    min-height: 108px !important;
    padding: 1rem !important;
    width: 100% !important;
}

#branches.branch-showcase .branch-image i {
    align-items: center !important;
    background: rgba(255, 255, 255, 0.1) !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    border-radius: 16px !important;
    color: #ffffff !important;
    display: inline-flex !important;
    font-size: 1.35rem !important;
    height: 52px !important;
    justify-content: center !important;
    width: 52px !important;
}

#branches.branch-showcase .branch-image .rank {
    background: rgba(255, 255, 255, 0.82) !important;
    border: 1px solid rgba(255, 255, 255, 0.55) !important;
    border-radius: 999px !important;
    color: #080808 !important;
    font-size: 0.76rem !important;
    font-weight: 950 !important;
    padding: 0.42rem 0.62rem !important;
}

#branches.branch-showcase .branch-content {
    align-content: start !important;
    display: grid !important;
    flex: 0 0 auto !important;
    gap: 0.85rem !important;
    margin: 0 !important;
    padding: 1rem !important;
}

#branches.branch-showcase .branch-content h3 {
    color: var(--branch-ink) !important;
    font-size: clamp(1.05rem, 1.25vw, 1.26rem) !important;
    font-weight: 950 !important;
    letter-spacing: 0 !important;
    line-height: 1.12 !important;
    margin: 0 !important;
}

#branches.branch-showcase .sem-subjects {
    display: grid !important;
    gap: 0.52rem !important;
    grid-template-columns: 1fr !important;
    margin: 0 !important;
}

#branches.branch-showcase .sem-row {
    background: var(--branch-soft) !important;
    border: 1px solid var(--branch-line) !important;
    border-radius: 14px !important;
    color: var(--branch-muted) !important;
    font-size: 0.78rem !important;
    line-height: 1.34 !important;
    padding: 0.58rem 0.68rem !important;
}

#branches.branch-showcase .sem-row span {
    color: var(--branch-ink) !important;
    font-weight: 950 !important;
}

body[data-theme="dark"] #branches.branch-showcase {
    --branch-paper: rgba(18, 18, 18, 0.96);
    --branch-soft: #0f0f0f;
    --branch-ink: #ffffff;
    --branch-muted: rgba(255, 255, 255, 0.68);
    --branch-line: rgba(255, 255, 255, 0.14);
    background:
        radial-gradient(circle, rgba(255, 255, 255, 0.12) 1px, transparent 1.4px) 0 0 / 18px 18px,
        linear-gradient(180deg, rgba(8, 8, 8, 0.92), rgba(16, 16, 16, 0.9));
    border-color: rgba(255, 255, 255, 0.12);
}

@media (max-width: 860px) {
    #branches.branch-showcase .branch-hero-panel {
        grid-template-columns: 1fr;
    }

    #branches.branch-showcase .branch-tabs {
        justify-self: start;
    }
}

@media (max-width: 560px) {
    #branches.branch-showcase {
        border-radius: 22px;
        padding: 0.85rem;
    }

    #branches.branch-showcase .branch-hero-panel {
        border-radius: 20px;
        padding: 1.05rem;
    }

    #branches.branch-showcase .branch-image {
        min-height: 92px !important;
    }
}

/* v78: Branch cards book page UI. */
#branches.branch-showcase .branch-card.branch-book-card,
#branches.branch-showcase .branch-card.branch-book-card:nth-child(n) {
    height: clamp(398px, 30vw, 430px) !important;
}

#branches.branch-showcase .branch-book-card .branch-content {
    display: grid !important;
    grid-template-rows: auto minmax(0, 1fr) !important;
    gap: 0.72rem !important;
    min-height: 0 !important;
    overflow: hidden !important;
    padding: 0.95rem !important;
}

#branches.branch-showcase .branch-book-card .branch-content h3 {
    min-height: 2.25em !important;
}

#branches.branch-showcase .branch-book {
    display: grid !important;
    grid-template-rows: minmax(0, 1fr) auto !important;
    min-height: 0 !important;
    overflow: hidden !important;
}

#branches.branch-showcase .branch-book-pages {
    background:
        linear-gradient(90deg, rgba(0, 0, 0, 0.08), transparent 12px),
        linear-gradient(180deg, #fffdf8, #f8f7f2) !important;
    border: 1px solid rgba(8, 8, 8, 0.16) !important;
    border-radius: 16px !important;
    box-shadow: inset 10px 0 18px rgba(8, 8, 8, 0.06), 0 10px 22px rgba(8, 8, 8, 0.06) !important;
    min-height: 0 !important;
    overflow: hidden !important;
    position: relative !important;
}

#branches.branch-showcase .branch-book-pages::after {
    background: linear-gradient(90deg, rgba(8, 8, 8, 0.1), transparent);
    content: "";
    inset: 0 auto 0 0;
    pointer-events: none;
    position: absolute;
    width: 14px;
}

#branches.branch-showcase .branch-book-page {
    display: none !important;
    grid-template-rows: auto minmax(0, 1fr) auto !important;
    height: 100% !important;
    min-height: 0 !important;
    padding: 0.72rem 0.74rem 0.62rem 0.92rem !important;
}

#branches.branch-showcase .branch-book-page.active {
    animation: branchBookPageIn 0.22s ease both;
    display: grid !important;
}

#branches.branch-showcase .branch-book-page-head,
#branches.branch-showcase .branch-book-page-foot {
    align-items: center !important;
    display: flex !important;
    justify-content: space-between !important;
    gap: 0.55rem !important;
}

#branches.branch-showcase .branch-book-page-head span {
    color: #080808 !important;
    font-size: 0.86rem !important;
    font-weight: 950 !important;
    letter-spacing: 0 !important;
}

#branches.branch-showcase .branch-book-page-head small,
#branches.branch-showcase .branch-book-page-foot {
    color: rgba(8, 8, 8, 0.55) !important;
    font-size: 0.66rem !important;
    font-weight: 800 !important;
}

#branches.branch-showcase .branch-book-subjects {
    display: grid !important;
    gap: 0.32rem !important;
    list-style: none !important;
    margin: 0.5rem 0 !important;
    min-height: 0 !important;
    overflow-x: hidden !important;
    overflow-y: auto !important;
    padding: 0 0.18rem 0 0 !important;
    scrollbar-color: rgba(8, 8, 8, 0.3) transparent;
    scrollbar-width: thin;
}

#branches.branch-showcase .branch-book-subjects::-webkit-scrollbar {
    width: 4px;
}

#branches.branch-showcase .branch-book-subjects::-webkit-scrollbar-thumb {
    background: rgba(8, 8, 8, 0.26);
    border-radius: 999px;
}

#branches.branch-showcase .branch-book-subjects li {
    border-bottom: 1px dotted rgba(8, 8, 8, 0.18) !important;
    color: rgba(8, 8, 8, 0.72) !important;
    display: -webkit-box !important;
    font-size: 0.68rem !important;
    font-weight: 650 !important;
    line-height: 1.24 !important;
    overflow: hidden !important;
    padding: 0 0 0.26rem !important;
    text-overflow: ellipsis !important;
    -webkit-box-orient: vertical !important;
    -webkit-line-clamp: 2 !important;
}

#branches.branch-showcase .branch-book-controls {
    align-items: center !important;
    display: grid !important;
    gap: 0.42rem !important;
    grid-template-columns: 32px auto minmax(0, 1fr) 32px !important;
    margin-top: 0.58rem !important;
}

#branches.branch-showcase .branch-book-turn {
    align-items: center !important;
    background: #080808 !important;
    border: 1px solid rgba(8, 8, 8, 0.2) !important;
    border-radius: 999px !important;
    color: #ffffff !important;
    cursor: pointer !important;
    display: inline-flex !important;
    height: 32px !important;
    justify-content: center !important;
    transition: transform 0.18s ease, background 0.18s ease !important;
    width: 32px !important;
}

#branches.branch-showcase .branch-book-turn:hover {
    background: var(--branch-red, #ed1c24) !important;
    transform: translateY(-1px);
}

#branches.branch-showcase .branch-book-count {
    color: var(--branch-ink, #080808) !important;
    font-size: 0.72rem !important;
    font-weight: 950 !important;
    white-space: nowrap !important;
}

#branches.branch-showcase .branch-book-dots {
    align-items: center !important;
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 0.28rem !important;
    justify-content: center !important;
}

#branches.branch-showcase .branch-book-dot {
    background: rgba(8, 8, 8, 0.18) !important;
    border-radius: 999px !important;
    cursor: pointer !important;
    height: 7px !important;
    transition: background 0.18s ease, width 0.18s ease !important;
    width: 7px !important;
}

#branches.branch-showcase .branch-book-dot.active {
    background: var(--branch-red, #ed1c24) !important;
    width: 18px !important;
}

body[data-theme="dark"] #branches.branch-showcase .branch-book-pages {
    background:
        linear-gradient(90deg, rgba(255, 255, 255, 0.1), transparent 12px),
        linear-gradient(180deg, #131313, #080808) !important;
    border-color: rgba(255, 255, 255, 0.14) !important;
}

body[data-theme="dark"] #branches.branch-showcase .branch-book-page-head span,
body[data-theme="dark"] #branches.branch-showcase .branch-book-count {
    color: #ffffff !important;
}

body[data-theme="dark"] #branches.branch-showcase .branch-book-page-head small,
body[data-theme="dark"] #branches.branch-showcase .branch-book-page-foot,
body[data-theme="dark"] #branches.branch-showcase .branch-book-subjects li {
    color: rgba(255, 255, 255, 0.72) !important;
}

body[data-theme="dark"] #branches.branch-showcase .branch-book-subjects li {
    border-bottom-color: rgba(255, 255, 255, 0.16) !important;
}

@keyframes branchBookPageIn {
    from {
        opacity: 0;
        transform: translateX(12px) rotateY(-4deg);
    }
    to {
        opacity: 1;
        transform: translateX(0) rotateY(0);
    }
}

@media (max-width: 560px) {
    #branches.branch-showcase .branch-card.branch-book-card,
    #branches.branch-showcase .branch-card.branch-book-card:nth-child(n) {
        height: 404px !important;
    }
}



/* v79: branch detail PYQ panel and filter containment */
.branch-detail-layout {
    align-items: start;
    grid-template-columns: minmax(250px, 320px) minmax(0, 1fr);
}

.branch-filter-panel {
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
}

.branch-filter-panel label,
.branch-detail-content,
.branch-detail-panel {
    min-width: 0;
}

.branch-filter-panel select,
.branch-filter-panel input,
.branch-filter-panel .video-btn {
    box-sizing: border-box;
    max-width: 100%;
    width: 100%;
}

.branch-resource-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.branch-pyq-card .pyq-btn {
    white-space: nowrap;
}

@media (max-width: 1020px) {
    .branch-detail-layout {
        grid-template-columns: 1fr;
    }
}

/* v81: branch section responsive book-card stabilization */
#branches.branch-showcase,
.branch-detail-page {
    max-inline-size: 100%;
    overflow-x: hidden;
}

#branches.branch-showcase .branches-grid {
    align-items: start !important;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)) !important;
}

#branches.branch-showcase .branch-card.branch-book-card,
#branches.branch-showcase .branch-card.branch-book-card:nth-child(n) {
    height: clamp(420px, 30vw, 456px) !important;
    max-inline-size: 100% !important;
    min-inline-size: 0 !important;
}

#branches.branch-showcase .branch-card.branch-book-card .branch-image {
    min-height: 96px !important;
}

#branches.branch-showcase .branch-book-card .branch-content {
    height: calc(100% - 96px) !important;
    min-height: 0 !important;
    overflow: hidden !important;
}

#branches.branch-showcase .branch-book {
    grid-template-rows: minmax(0, 1fr) 42px !important;
    height: 100% !important;
    overflow: visible !important;
}

#branches.branch-showcase .branch-book-pages {
    min-height: 0 !important;
}

#branches.branch-showcase .branch-book-page {
    min-height: 0 !important;
}

#branches.branch-showcase .branch-book-subjects {
    min-height: 0 !important;
    overflow-y: auto !important;
}

#branches.branch-showcase .branch-book-subjects li {
    overflow-wrap: anywhere !important;
}

#branches.branch-showcase .branch-book-controls {
    align-self: end !important;
    grid-template-columns: 34px minmax(38px, auto) minmax(0, 1fr) 34px !important;
    margin-top: 0.5rem !important;
    min-height: 40px !important;
    overflow: visible !important;
    padding-bottom: 0.08rem !important;
}

#branches.branch-showcase .branch-book-turn {
    height: 34px !important;
    min-height: 34px !important;
    width: 34px !important;
}

#branches.branch-showcase .branch-book-dots {
    min-width: 0 !important;
    overflow: hidden !important;
}

.branch-detail-layout,
.branch-detail-content,
.branch-detail-panel,
.branch-filter-panel {
    min-inline-size: 0 !important;
    max-inline-size: 100% !important;
}

.branch-detail-panel {
    overflow: hidden;
}

.branch-filter-panel select,
.branch-filter-panel input,
.branch-filter-panel button {
    inline-size: 100% !important;
    max-inline-size: 100% !important;
}

.branch-resource-grid,
.branch-video-grid,
.branch-pyq-grid,
.branch-subject-grid {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 245px), 1fr)) !important;
}

@media (min-width: 1441px) {
    #branches.branch-showcase .branches-grid {
        grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)) !important;
    }
}

@media (max-width: 900px) {
    #branches.branch-showcase .branches-grid,
    .branch-resource-grid,
    .branch-video-grid,
    .branch-pyq-grid,
    .branch-subject-grid {
        grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)) !important;
    }

    #branches.branch-showcase .branch-card.branch-book-card,
    #branches.branch-showcase .branch-card.branch-book-card:nth-child(n) {
        height: 430px !important;
    }
}

@media (max-width: 560px) {
    #branches.branch-showcase .branches-grid,
    .branch-resource-grid,
    .branch-video-grid,
    .branch-pyq-grid,
    .branch-subject-grid {
        grid-template-columns: 1fr !important;
    }

    #branches.branch-showcase .branch-card.branch-book-card,
    #branches.branch-showcase .branch-card.branch-book-card:nth-child(n) {
        height: 412px !important;
    }

    #branches.branch-showcase .branch-card.branch-book-card .branch-image {
        min-height: 84px !important;
    }

    #branches.branch-showcase .branch-book-card .branch-content {
        height: calc(100% - 84px) !important;
    }

    #branches.branch-showcase .branch-book-controls {
        grid-template-columns: 32px minmax(36px, auto) minmax(0, 1fr) 32px !important;
    }

    #branches.branch-showcase .branch-book-turn {
        height: 32px !important;
        width: 32px !important;
    }
}


/* v80: branch study filter content type shortcuts */
.branch-content-type-control {
    display: grid;
    gap: 0.5rem;
    min-width: 0;
}

.branch-content-type-control > span {
    color: var(--gray);
    font-size: 0.82rem;
    font-weight: 700;
}

.branch-content-type-options {
    display: grid;
    gap: 0.45rem;
}

.branch-content-type-btn {
    align-items: center;
    background: color-mix(in srgb, var(--white) 94%, transparent);
    border: 2px solid color-mix(in srgb, var(--dark) 52%, var(--border));
    border-radius: 999px;
    box-sizing: border-box;
    color: var(--dark);
    display: flex;
    font-size: 0.92rem;
    font-weight: 700;
    justify-content: flex-start;
    min-height: 38px;
    padding: 0.55rem 0.95rem;
    text-decoration: none;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
    width: 100%;
}

.branch-content-type-btn:hover,
.branch-content-type-btn:focus-visible {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-1px);
}

.branch-content-type-btn.active {
    background: #111;
    border-color: #111;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 10px 22px rgba(0, 0, 0, 0.16);
    color: #fff;
}

[data-theme="dark"] .branch-content-type-btn {
    background: color-mix(in srgb, var(--white) 8%, transparent);
    border-color: color-mix(in srgb, var(--white) 52%, var(--border));
    color: var(--dark);
}

[data-theme="dark"] .branch-content-type-btn.active {
    background: var(--white);
    border-color: var(--white);
    color: var(--black);
}

/* v83: Lecture unit filter and clearer in-page video action. */
.lecture-card .video-badge {
    display: inline-flex;
    margin-bottom: 0.25rem;
    position: static;
}

.lecture-meta-line strong {
    color: var(--dark);
}

.lecture-card .lecture-watch-btn {
    justify-content: center;
    margin-top: 0.55rem;
    min-height: 42px;
    width: 100%;
}

.lecture-card .video-btn.secondary {
    justify-content: center;
    margin-top: 0.45rem;
    width: 100%;
}

@media (max-width: 720px) {
    .lecture-card {
        grid-template-columns: 46px minmax(0, 1fr);
    }

    .lecture-card-icon {
        height: 46px;
        width: 46px;
    }
}

/* Scroll stability: keep mouse wheel and mobile touch scrolling available. */
html,
body {
    height: auto;
    min-height: 100%;
    overflow-y: auto !important;
    overscroll-behavior-y: auto;
}

body {
    -webkit-overflow-scrolling: touch;
}

@media (hover: none), (pointer: coarse) {
    html,
    body {
        touch-action: pan-y;
    }
}