/* ═══════════════════════════════════════════════════
   Oxford School — Computer Lab
   Premium Light-Mode Design System
   ═══════════════════════════════════════════════════ */

/* ── Reset ───────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    /* Brand Palette */
    --oxford-navy:    #1B2A4A;
    --oxford-gold:    #C9A84C;
    --oxford-gold-l:  #F5EDDA;
    --oxford-blue:    #3B5998;
    --oxford-blue-l:  #E8EDF5;

    /* Neutral */
    --bg:          #FAF9F7;
    --bg-warm:     #F5F3EF;
    --card:        #FFFFFF;
    --text:        #1A1A1A;
    --text-2:      #555555;
    --text-3:      #999999;
    --border:      #E8E5DF;
    --border-2:    #D5D0C8;

    /* Accents for classes */
    --c3: #E74C3C; --c4: #E67E22; --c5: #F1C40F;
    --c6: #2ECC71; --c7: #1ABC9C; --c8: #3498DB;
    --c9: #9B59B6; --c10: #E91E63;

    /* Shadows */
    --sh-sm: 0 1px 3px rgba(0,0,0,.04), 0 1px 2px rgba(0,0,0,.06);
    --sh-md: 0 4px 12px rgba(0,0,0,.06), 0 2px 4px rgba(0,0,0,.04);
    --sh-lg: 0 10px 30px rgba(0,0,0,.08), 0 4px 8px rgba(0,0,0,.04);
    --sh-xl: 0 20px 50px rgba(0,0,0,.10);

    --radius:    16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ── Top Navbar ──────────────────────────────────── */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.navbar .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    text-decoration: none;
    color: var(--text);
}
.navbar .brand .logo {
    width: 38px; height: 38px;
    background: linear-gradient(135deg, var(--oxford-navy), var(--oxford-blue));
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem;
    color: #fff;
    box-shadow: var(--sh-sm);
}
.navbar .brand-text {
    font-weight: 700;
    font-size: 1.08rem;
    letter-spacing: -.3px;
}
.navbar .brand-text span {
    color: var(--oxford-gold);
}
.navbar .breadcrumbs {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: .88rem;
    color: var(--text-3);
}
.navbar .breadcrumbs .sep { opacity: .4; }
.navbar .breadcrumbs .current {
    color: var(--oxford-navy);
    font-weight: 600;
}
.nav-back {
    display: flex; align-items: center; gap: 6px;
    background: var(--bg-warm);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: .85rem;
    font-weight: 500;
    color: var(--text-2);
    cursor: pointer;
    transition: all .2s;
    text-decoration: none;
}
.nav-back:hover {
    background: var(--oxford-blue-l);
    color: var(--oxford-navy);
    border-color: var(--oxford-blue);
}

/* ── Hero / Home ─────────────────────────────────── */
.hero {
    position: relative;
    padding: 80px 24px 60px;
    text-align: center;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -120px; left: 50%;
    transform: translateX(-50%);
    width: 800px; height: 800px;
    background: radial-gradient(circle, rgba(201,168,76,.12) 0%, transparent 60%);
    pointer-events: none;
}
.hero .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--oxford-gold-l);
    color: #8B7028;
    font-weight: 600;
    font-size: .78rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 8px 20px;
    border-radius: 50px;
    margin-bottom: 24px;
    border: 1px solid rgba(201,168,76,.25);
    animation: fadeDown .6s ease;
}
.hero h1 {
    font-family: 'Playfair Display', serif;
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--oxford-navy);
    line-height: 1.15;
    margin-bottom: 16px;
    animation: fadeDown .7s ease;
}
.hero h1 .gold { color: var(--oxford-gold); }
.hero .tagline {
    font-size: 1.12rem;
    color: var(--text-2);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
    animation: fadeDown .8s ease;
}

/* ── Classes Grid ────────────────────────────────── */
.section-wrap {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px 80px;
}
.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
}
.section-title .dot {
    width: 8px; height: 8px;
    background: var(--oxford-gold);
    border-radius: 50%;
}
.section-title h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -.3px;
}
.section-title h2 span { color: var(--text-3); font-weight: 400; margin-left: 6px; }

.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 18px;
    animation: fadeUp .7s ease;
}
.class-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    cursor: pointer;
    transition: all .3s cubic-bezier(.25,.8,.25,1);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: var(--text);
}
.class-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    border-radius: var(--radius) var(--radius) 0 0;
    transition: height .3s;
}
.class-card[data-class="3"]::before  { background: var(--c3); }
.class-card[data-class="4"]::before  { background: var(--c4); }
.class-card[data-class="5"]::before  { background: var(--c5); }
.class-card[data-class="6"]::before  { background: var(--c6); }
.class-card[data-class="7"]::before  { background: var(--c7); }
.class-card[data-class="8"]::before  { background: var(--c8); }
.class-card[data-class="9"]::before  { background: var(--c9); }
.class-card[data-class="10"]::before { background: var(--c10); }

.class-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--sh-lg);
    border-color: transparent;
}
.class-card:hover::before { height: 6px; }
.class-card .class-num {
    font-family: 'Playfair Display', serif;
    font-size: 2.4rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 8px;
}
.class-card[data-class="3"]  .class-num { color: var(--c3); }
.class-card[data-class="4"]  .class-num { color: var(--c4); }
.class-card[data-class="5"]  .class-num { color: var(--c5); }
.class-card[data-class="6"]  .class-num { color: var(--c6); }
.class-card[data-class="7"]  .class-num { color: var(--c7); }
.class-card[data-class="8"]  .class-num { color: var(--c8); }
.class-card[data-class="9"]  .class-num { color: var(--c9); }
.class-card[data-class="10"] .class-num { color: var(--c10); }

.class-card .class-label {
    font-size: .88rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}
.class-card .class-count {
    font-size: .78rem;
    color: var(--text-3);
}
.class-card .arrow {
    position: absolute;
    bottom: 20px; right: 20px;
    width: 32px; height: 32px;
    background: var(--bg-warm);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: .85rem;
    color: var(--text-3);
    transition: all .3s;
}
.class-card:hover .arrow {
    background: var(--oxford-navy);
    color: #fff;
    transform: translateX(3px);
}

/* ── Category Page (PPT / Notes) ─────────────────── */
.category-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 48px 24px 80px;
    animation: fadeUp .5s ease;
}
.category-header {
    text-align: center;
    margin-bottom: 44px;
}
.category-header .class-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 700;
    font-size: .82rem;
    letter-spacing: .8px;
    text-transform: uppercase;
    margin-bottom: 18px;
}
.category-header h1 {
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--oxford-navy);
    margin-bottom: 8px;
}
.category-header p {
    color: var(--text-2);
    font-size: .95rem;
}

.cat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}
.cat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 28px;
    text-align: center;
    cursor: pointer;
    transition: all .3s cubic-bezier(.25,.8,.25,1);
    text-decoration: none;
    color: var(--text);
}
.cat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--sh-lg);
    border-color: transparent;
}
.cat-card .cat-icon {
    width: 64px; height: 64px;
    border-radius: 18px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem;
    margin: 0 auto 18px;
}
.cat-card.ppt .cat-icon  { background: #FFF3E0; }
.cat-card.notes .cat-icon { background: #E8F5E9; }
.cat-card .cat-label {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 6px;
}
.cat-card .cat-desc {
    font-size: .84rem;
    color: var(--text-3);
    line-height: 1.5;
}
.cat-card .cat-count {
    display: inline-block;
    margin-top: 14px;
    background: var(--bg-warm);
    padding: 4px 14px;
    border-radius: 50px;
    font-size: .76rem;
    font-weight: 600;
    color: var(--text-2);
}

/* ── Lessons List ────────────────────────────────── */
.lessons-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 48px 24px 80px;
    animation: fadeUp .5s ease;
}
.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.lesson-item {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 28px;
    display: flex;
    align-items: center;
    gap: 18px;
    cursor: pointer;
    transition: all .3s cubic-bezier(.25,.8,.25,1);
    text-decoration: none;
    color: var(--text);
}
.lesson-item:hover {
    transform: translateX(6px);
    box-shadow: var(--sh-md);
    border-color: var(--oxford-blue);
}
.lesson-item .lesson-num {
    width: 44px; height: 44px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800;
    font-size: 1rem;
    flex-shrink: 0;
}
.lesson-item .lesson-info {
    flex: 1;
}
.lesson-item .lesson-name {
    font-weight: 600;
    font-size: .98rem;
    margin-bottom: 2px;
}
.lesson-item .lesson-type {
    font-size: .78rem;
    color: var(--text-3);
}
.lesson-item .lesson-arrow {
    font-size: 1rem;
    color: var(--text-3);
    transition: transform .3s, color .3s;
}
.lesson-item:hover .lesson-arrow {
    transform: translateX(4px);
    color: var(--oxford-blue);
}

/* ── Content View (Iframe / Embedded) ────────────── */
.content-page {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px 60px;
    animation: fadeUp .4s ease;
}
.content-frame-wrap {
    width: 100%;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--sh-md);
}
.content-frame-wrap iframe {
    width: 100%;
    min-height: 85vh;
    border: none;
    display: block;
}

/* ── Empty / No Content ──────────────────────────── */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    animation: fadeUp .5s ease;
}
.empty-state .empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: .6;
}
.empty-state h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-2);
    margin-bottom: 6px;
}
.empty-state p {
    font-size: .88rem;
    color: var(--text-3);
}

/* ── Footer ──────────────────────────────────────── */
.site-footer {
    text-align: center;
    padding: 30px 24px;
    border-top: 1px solid var(--border);
    background: var(--card);
    font-size: .8rem;
    color: var(--text-3);
}
.site-footer .heart { color: var(--c3); }
.site-footer strong { color: var(--oxford-navy); font-weight: 600; }

/* ── Animations ──────────────────────────────────── */
@keyframes fadeDown {
    from { opacity: 0; transform: translateY(-16px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Fullscreen Button ───────────────────────────── */
.content-frame-wrap {
    position: relative;
}
.fullscreen-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 10;
    background: rgba(27, 42, 74, 0.85); /* Navy transparent */
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    padding: 8px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
.fullscreen-btn:hover {
    background: var(--oxford-navy);
    transform: scale(1.05);
}
.fullscreen-btn .icon {
    font-size: 0.95rem;
}

/* Fullscreen Mode overrides */
.content-frame-wrap:fullscreen {
    width: 100vw;
    height: 100vh;
    border: none;
    border-radius: 0;
    padding: 0;
    background: #000;
}
.content-frame-wrap:fullscreen iframe {
    height: 100vh;
    min-height: 100vh;
}
.content-frame-wrap:fullscreen .fullscreen-btn {
    top: 16px;
    right: 16px;
    background: rgba(0, 0, 0, 0.6);
}

/* For older Webkit fullscreen API */
.content-frame-wrap:-webkit-full-screen {
    width: 100% !important;
    height: 100% !important;
    border: none;
    border-radius: 0;
    padding: 0;
}
.content-frame-wrap:-webkit-full-screen iframe {
    height: 100% !important;
}

/* Content View Mode (Native App feel on Desktop & Mobile) */
body.content-view-mode {
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
body.content-view-mode #app {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}
body.content-view-mode .content-page {
    flex: 1;
    width: 100%;
    max-width: none;
    padding: 24px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
body.content-view-mode .content-frame-wrap {
    flex: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    height: 100%;
}
body.content-view-mode .content-frame-wrap iframe {
    flex: 1;
    height: 100%;
    min-height: 0;
}

/* ── Responsive Spacing & Layouts ────────────────── */
@media (max-width: 768px) {
    /* Navbar compact mode */
    .navbar {
        height: 56px;
        padding: 0 16px;
    }
    .navbar .brand {
        gap: 8px;
    }
    .navbar .brand .logo {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }
    .navbar .brand-text {
        font-size: 0.95rem;
    }
    .navbar .breadcrumbs {
        display: none; /* Hide breadcrumbs on tablet/mobile */
    }
    .nav-back {
        padding: 6px 12px;
        font-size: 0.78rem;
    }

    /* Hero compact styling for smaller screens */
    .hero {
        padding: 40px 20px 24px;
        background: radial-gradient(circle at top, rgba(201,168,76,0.15) 0%, transparent 75%);
    }
    .hero::before {
        display: none; /* Hide expensive overlay gradients */
    }
    .hero h1 {
        font-size: 1.8rem;
        line-height: 1.25;
        margin-bottom: 12px;
        letter-spacing: -0.5px;
    }
    .hero .tagline {
        font-size: 0.9rem;
        line-height: 1.5;
        color: var(--text-2);
        max-width: 100%;
        padding: 0 8px;
    }
    .hero .badge {
        padding: 6px 14px;
        font-size: 0.68rem;
        letter-spacing: 0.5px;
        margin-bottom: 14px;
    }

    /* Section layout */
    .section-wrap {
        padding: 0 16px 40px;
    }
    .section-title {
        margin-bottom: 16px;
        gap: 8px;
    }
    .section-title .dot {
        width: 6px;
        height: 6px;
    }
    .section-title h2 {
        font-size: 0.95rem;
    }
    .section-title h2 span {
        display: block;
        margin-left: 0;
        margin-top: 2px;
        font-size: 0.8rem;
    }

    /* Premium mobile classes grid - responsive 2 columns, beautiful layout */
    .classes-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    .class-card {
        padding: 16px 14px;
        border-radius: var(--radius-sm);
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        min-height: 110px;
    }
    .class-card .class-num {
        font-size: 1.6rem;
        margin-bottom: 2px;
    }
    .class-card .class-label {
        font-size: 0.85rem;
        font-weight: 700;
        margin-bottom: 2px;
    }
    .class-card .class-count {
        font-size: 0.7rem;
    }
    .class-card .arrow {
        display: none; /* Keep clean without arrow on small devices */
    }

    /* Category selection page */
    .category-page {
        padding: 24px 16px 48px;
    }
    .category-header {
        margin-bottom: 24px;
    }
    .category-header .class-badge {
        padding: 6px 16px;
        font-size: 0.75rem;
        margin-bottom: 12px;
    }
    .category-header h1 {
        font-size: 1.6rem;
    }
    .category-header p {
        font-size: 0.85rem;
    }
    .cat-cards {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .cat-card {
        padding: 24px 16px;
        border-radius: var(--radius-sm);
    }
    .cat-card .cat-icon {
        width: 48px;
        height: 48px;
        font-size: 1.4rem;
        margin-bottom: 12px;
        border-radius: 12px;
    }
    .cat-card .cat-label {
        font-size: 0.95rem;
        margin-bottom: 4px;
    }
    .cat-card .cat-desc {
        font-size: 0.78rem;
    }
    .cat-card .cat-count {
        margin-top: 10px;
        padding: 2px 10px;
        font-size: 0.7rem;
    }

    /* Lessons list page */
    .lessons-page {
        padding: 24px 16px 48px;
    }
    .lessons-list {
        gap: 10px;
    }
    .lesson-item {
        padding: 14px 16px;
        gap: 12px;
        border-radius: var(--radius-sm);
    }
    .lesson-item .lesson-num {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
        border-radius: 8px;
    }
    .lesson-item .lesson-name {
        font-size: 0.88rem;
    }
    .lesson-item .lesson-type {
        font-size: 0.72rem;
    }

    /* Content page inside iframe (eliminate padding to maximize view space) */
    body.content-view-mode .content-page {
        padding: 8px;
    }
    body.content-view-mode .content-frame-wrap {
        border-radius: var(--radius-sm);
    }
    .fullscreen-btn {
        top: 8px;
        right: 8px;
        padding: 6px 12px;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .classes-grid {
        grid-template-columns: 1fr;
    }
    /* Full edge-to-edge for content pages on tiny devices */
    body.content-view-mode .content-page {
        padding: 0;
    }
    body.content-view-mode .content-frame-wrap {
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
    .fullscreen-btn {
        top: 6px;
        right: 6px;
    }
}

/* ── Quiz Category Card ──────────────────────────── */
.cat-card.quiz .cat-icon {
    background: #E1F5FE; /* Light Blue background for quizzes */
    color: #0288D1;
}

/* ── Student Quiz Layout ─────────────────────────── */
.quiz-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
    animation: fadeUp 0.5s ease;
}
.quiz-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--sh-lg);
    position: relative;
    overflow: hidden;
}

/* Form Styles for Student Registration */
.quiz-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 24px;
    text-align: left;
}
.quiz-form .form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.quiz-form label {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-2);
}
.quiz-form input, .quiz-form select {
    padding: 12px 16px;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-warm);
    color: var(--text);
    transition: all 0.2s;
}
.quiz-form input:focus, .quiz-form select:focus {
    outline: none;
    border-color: var(--oxford-blue);
    background: #fff;
    box-shadow: 0 0 0 3px var(--oxford-blue-l);
}
.quiz-start-btn {
    padding: 14px;
    background: var(--oxford-navy);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 10px;
    text-align: center;
}
.quiz-start-btn:hover {
    background: var(--oxford-blue);
}

/* Quiz Board and Progress */
.quiz-header {
    margin-bottom: 24px;
}
.quiz-progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-3);
    margin-bottom: 8px;
    font-weight: 600;
}
.quiz-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-warm);
    border-radius: 50px;
    overflow: hidden;
    margin-bottom: 20px;
}
.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--oxford-blue), var(--oxford-gold));
    width: 0%;
    transition: width 0.3s ease;
}
.quiz-qtext {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.5;
    color: var(--oxford-navy);
    margin-bottom: 24px;
    text-align: left;
}

/* Options list */
.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}
.quiz-option {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    text-align: left;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text);
}
.quiz-option:hover {
    border-color: var(--oxford-blue);
    background: var(--oxford-blue-l);
    transform: translateY(-1px);
}
.quiz-option.correct {
    background: #E8F5E9;
    border-color: #81C784;
    color: #2E7D32;
    font-weight: 600;
}
.quiz-option.incorrect {
    background: #FFEBEE;
    border-color: #EF9A9A;
    color: #C62828;
    font-weight: 600;
}
.quiz-option-status {
    font-size: 1.1rem;
    font-weight: 700;
}

/* Explanation Box */
.quiz-explanation {
    background: #FFFDE7;
    border-left: 4px solid var(--oxford-gold);
    padding: 16px 20px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 24px;
    text-align: left;
    animation: fadeUp 0.3s ease;
}
.quiz-explanation h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: #857018;
    margin-bottom: 4px;
    letter-spacing: 0.5px;
}
.quiz-explanation p {
    font-size: 0.88rem;
    color: var(--text-2);
    line-height: 1.6;
}

/* Next / Action Buttons */
.quiz-action-bar {
    display: flex;
    justify-content: flex-end;
}
.quiz-next-btn {
    padding: 12px 28px;
    background: var(--oxford-gold);
    color: #fff;
    border: none;
    border-radius: 50px;
    font-size: 0.92rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 10px rgba(201,168,76,0.3);
}
.quiz-next-btn:hover {
    background: var(--oxford-navy);
    box-shadow: 0 4px 10px rgba(27,42,74,0.3);
    transform: translateY(-1px);
}

/* ── Completion & Results Page ──────────────────── */
.quiz-results {
    text-align: center;
}
.quiz-results h2 {
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    color: var(--oxford-navy);
    margin-bottom: 8px;
}
.quiz-results .tagline {
    font-size: 0.95rem;
    color: var(--text-2);
    margin-bottom: 24px;
}
.score-circle-container {
    position: relative;
    width: 140px;
    height: 140px;
    margin: 0 auto 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-warm);
    border-radius: 50%;
    border: 6px solid var(--border);
}
.score-circle-container.pass {
    border-color: #81C784;
    background: #E8F5E9;
}
.score-circle-container.fail {
    border-color: #E8E4DE;
    background: var(--bg-warm);
}
.score-circle-text {
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--oxford-navy);
}
.score-circle-label {
    font-size: 0.72rem;
    color: var(--text-3);
    position: absolute;
    bottom: 24px;
    font-weight: 700;
    text-transform: uppercase;
}
.results-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 32px;
}
.results-btn {
    padding: 12px 24px;
    border-radius: 50px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    border: 1px solid transparent;
    display: inline-block;
}
.results-btn.primary {
    background: var(--oxford-navy);
    color: #fff;
}
.results-btn.primary:hover {
    background: var(--oxford-blue);
}
.results-btn.secondary {
    background: var(--bg-warm);
    border-color: var(--border);
    color: var(--text-2);
}
.results-btn.secondary:hover {
    background: #fff;
    border-color: var(--oxford-blue);
    color: var(--oxford-blue);
}

/* ── Teacher Gradebook Dashboard ─────────────────── */
.gradebook-container {
    max-width: 1000px;
    margin: 40px auto 80px;
    padding: 0 24px;
    animation: fadeUp 0.5s ease;
}
.gradebook-header {
    margin-bottom: 28px;
    text-align: left;
}
.gradebook-header h1 {
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    color: var(--oxford-navy);
    margin-bottom: 6px;
}
.gradebook-header p {
    color: var(--text-2);
    font-size: 0.95rem;
}
.gradebook-filters {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px 24px;
    margin-bottom: 20px;
    display: flex;
    gap: 16px;
    align-items: center;
    box-shadow: var(--sh-sm);
}
.gradebook-filters input, .gradebook-filters select {
    padding: 10px 14px;
    font-size: 0.9rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    background: var(--bg-warm);
    color: var(--text);
    outline: none;
    transition: all 0.2s;
}
.gradebook-filters input:focus, .gradebook-filters select:focus {
    border-color: var(--oxford-blue);
    background: #fff;
}
.gradebook-filters input {
    flex: 1;
}

.table-wrapper {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--sh-sm);
}
.gradebook-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    text-align: left;
}
.gradebook-table th {
    background: var(--bg-warm);
    color: var(--oxford-navy);
    font-weight: 700;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
}
.gradebook-table td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    color: var(--text-2);
}
.gradebook-table tr:last-child td {
    border-bottom: none;
}
.gradebook-table tr:hover td {
    background: var(--bg-warm);
}
.gradebook-score-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
}
.gradebook-score-badge.high {
    background: #E8F5E9;
    color: #2E7D32;
}
.gradebook-score-badge.mid {
    background: #FFFDE7;
    color: #F57F17;
}
.gradebook-score-badge.low {
    background: #FFEBEE;
    color: #C62828;
}

/* Passcode Gate View */
.gate-page {
    max-width: 400px;
    margin: 80px auto;
    padding: 0 20px;
}
.gate-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--sh-lg);
}
.gate-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}
.gate-card h2 {
    font-family: 'Playfair Display', serif;
    font-size: 1.7rem;
    color: var(--oxford-navy);
    margin-bottom: 8px;
}
.gate-card p {
    font-size: 0.88rem;
    color: var(--text-2);
    margin-bottom: 24px;
}
.gate-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    text-align: left;
}
.gate-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-warm);
    color: var(--text);
    outline: none;
    transition: all 0.2s;
}
.gate-input:focus {
    border-color: var(--oxford-blue);
    background: #fff;
    box-shadow: 0 0 0 3px var(--oxford-blue-l);
}
.gate-btn {
    padding: 12px;
    background: var(--oxford-navy);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    text-align: center;
}
.gate-btn:hover {
    background: var(--oxford-blue);
}

/* ── Certificate / Report Print Layout ───────────── */
@media print {
    body {
        background: #fff;
        color: #000;
    }
    /* Hide all standard site UI during printing */
    .navbar, .site-footer, .results-actions, .quiz-progress-bar, .quiz-progress-info, .quiz-action-bar {
        display: none !important;
    }
    
    .quiz-container {
        max-width: 100% !important;
        margin: 0 !important;
        padding: 0 !important;
    }
    
    .quiz-card {
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }
    
    /* Format the Results into a Certificate */
    .print-certificate {
        display: block !important;
        border: 8px double var(--oxford-navy) !important;
        padding: 40px !important;
        margin: 20px auto !important;
        max-width: 650px !important;
        text-align: center !important;
        background: #fff !important;
    }
    
    .print-cert-header {
        font-family: 'Playfair Display', serif;
        color: var(--oxford-navy);
        margin-bottom: 24px;
    }
    .print-cert-header h2 {
        font-size: 1.8rem;
        text-transform: uppercase;
        letter-spacing: 1px;
    }
    
    .print-cert-body {
        margin-bottom: 40px;
        line-height: 1.8;
    }
    .print-cert-body p {
        font-size: 1.05rem;
        margin: 12px 0;
    }
    .print-student-name {
        font-family: 'Playfair Display', serif;
        font-size: 2rem;
        font-weight: 800;
        color: var(--oxford-gold);
        text-decoration: underline;
        margin: 16px 0 !important;
    }
    
    .print-cert-footer {
        display: flex !important;
        justify-content: space-between;
        margin-top: 60px;
        padding: 0 40px;
    }
    
    .sig-line {
        border-top: 1px solid #000;
        width: 160px;
        padding-top: 6px;
        font-size: 0.8rem;
        font-weight: 600;
        text-transform: uppercase;
    }
}

/* Hide Print Certificate View on normal web display */
.print-certificate {
    display: none;
}