:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-deep: #1d4ed8;
    --primary-light: #60a5fa;
    --primary-rgb: 59, 130, 246;
    --bg-soft: #eff6ff;
    --bg-border: #dbeafe;
    --accent-border: #93c5fd;
    --bg-page: #f0f7ff;
    --header-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --font-size: 16px;
}

html {
    font-size: var(--font-size, 16px);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: var(--bg-page);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

main.container {
    flex: 1;
    padding: 36px 20px 64px;
}

a {
    color: var(--primary-dark);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Header */
.site-header {
    background: var(--header-bg);
    border-bottom: 1px solid var(--bg-border);
    position: sticky;
    top: 0;
    z-index: 20;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
}

/* Hamburger (mobile only; toggled via footer script) */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    padding: 10px;
    background: var(--bg-soft);
    border: 1px solid var(--bg-border);
    border-radius: 10px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    border-radius: 2px;
    background: var(--primary-deep);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
}

.brand:hover {
    text-decoration: none;
}

.site-logo {
    max-height: 42px;
    width: auto;
    display: block;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 18px;
}

.nav-user {
    color: var(--text-muted);
}

.main-nav a:hover {
    text-decoration: none;
}

.main-nav a.active {
    color: #f97316;
    font-weight: 700;
    position: relative;
}

.main-nav a.active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 3px;
    border-radius: 3px;
    background: linear-gradient(90deg, #f97316, #fb923c);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 8px 18px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    text-align: center;
}

.btn:hover {
    text-decoration: none;
    filter: brightness(0.94);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-ghost {
    background: #fff;
    color: var(--primary-dark);
    border-color: var(--primary);
}

.btn-danger {
    background: #dc2626;
    color: #fff;
}

.btn-sm {
    padding: 4px 10px;
    font-size: 0.75rem;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-lg {
    padding: 12px 18px;
    font-size: 1rem;
}

.btn-white {
    background: #fff;
    color: var(--primary-dark);
}

.btn-white:hover {
    background: var(--bg-page);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.7);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: #fff;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-top: 26px;
    flex-wrap: wrap;
}

.hero-cta .btn {
    min-width: 170px;
    font-size: 0.9375rem;
    padding: 12px 22px;
    border-radius: 999px;
    box-shadow: 0 6px 18px rgba(59, 130, 246, 0.3);
}

.page-head .hero-cta {
    justify-content: flex-start;
    margin-top: 18px;
}

.page-head .hero-cta .btn {
    box-shadow: none;
}

/* Hero */
.hero {
    text-align: center;
    padding: 46px 20px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
    border-radius: 16px;
    color: #fff;
}

.hero h1 {
    font-size: 2.375rem;
    margin: 0 0 10px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}

.hero p {
    font-size: 1.0625rem;
    margin: 0;
    opacity: 0.95;
}

/* CTA panel */
.cta-panel {
    margin-top: 36px;
    text-align: center;
    padding: 44px 24px;
    border-radius: 16px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-deep));
    box-shadow: 0 12px 32px rgba(var(--primary-rgb), 0.25);
}

.cta-panel h2 {
    margin: 0 0 8px;
    font-size: 1.75rem;
}

.cta-panel p {
    margin: 0;
    font-size: 1rem;
    opacity: 0.95;
}

/* Category filter */
.category-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 20px 0 4px;
}

.chip {
    display: inline-block;
    background: #fff;
    border: 1px solid var(--accent-border);
    color: var(--primary-deep);
    font-size: 0.8125rem;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 999px;
}

.chip:hover {
    text-decoration: none;
    border-color: var(--primary-dark);
    background: var(--bg-border);
}

.chip.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* Notes grid */
.note-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.note-card {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 5px solid var(--primary);
    border-radius: 12px;
    padding: 20px;
    transition: box-shadow 0.15s ease;
}

.note-card:hover {
    box-shadow: 0 8px 20px rgba(var(--primary-rgb), 0.15);
}

.note-card h3 {
    margin: 10px 0;
    font-size: 1.125rem;
}

.note-card h3 a {
    color: var(--text-main);
}

.note-card h3 a:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

.note-card p {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.5;
    margin: 0 0 14px;
}

.note-category {
    display: inline-block;
    background: var(--bg-border);
    color: var(--primary-deep);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.note-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.note-full {
    background: var(--bg-soft);
    border: 1px solid var(--bg-border);
    border-radius: 10px;
    padding: 12px 14px;
    margin: 0 0 14px;
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-main);
}

.note-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 16px;
}

/* Note detail */
.note-detail {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 5px solid var(--primary);
    border-radius: 12px;
    padding: 28px;
}

.note-detail-head {
    border-bottom: 1px solid var(--bg-border);
    padding-bottom: 16px;
    margin-bottom: 20px;
}

.note-detail-head h1 {
    margin: 12px 0 8px;
    font-size: 1.875rem;
}

.note-content {
    line-height: 1.7;
    color: var(--text-main);
    font-size: 0.9375rem;
}

/* Alerts */
.alert {
    border-radius: 10px;
    padding: 12px 16px;
    margin-bottom: 16px;
    font-size: 0.875rem;
}

.alert-success { background: #dcfce7; color: #166534; }
.alert-error   { background: #fee2e2; color: #991b1b; }
.alert-info    { background: var(--bg-border); color: var(--primary-deep); }

/* Auth */
.auth-card {
    max-width: 420px;
    margin: 40px auto;
    background: #fff;
    border: 1px solid var(--bg-border);
    border-top: 5px solid var(--primary);
    border-radius: 12px;
    padding: 28px;
}

.auth-lock {
    width: 64px;
    height: 64px;
    margin: -4px auto 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-soft);
    color: var(--primary-deep);
}

.auth-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin: -10px 0 18px;
    font-size: 0.95rem;
}

.auth-card h1 {
    margin-top: 0;
    text-align: center;
    color: var(--primary-deep);
}

.auth-alt,
.auth-note {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.auth-note {
    font-size: 0.75rem;
    margin-top: 18px;
    padding-top: 12px;
    border-top: 1px dashed var(--bg-border);
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    font-size: 0.875rem;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.18);
}

.form-card {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 12px;
    padding: 24px;
    max-width: 640px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
}

/* Admin */
.admin-bar {
    display: flex;
    align-items: center;
    gap: 18px;
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 12px;
    padding: 10px 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.admin-bar a {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-main);
}

.admin-bar a:hover {
    text-decoration: none;
    color: var(--primary-dark);
}

.admin-bar a.active {
    color: var(--primary-dark);
    border-bottom: 2px solid var(--primary);
    padding-bottom: 2px;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.stat-card {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-top: 4px solid var(--primary);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.stat-card strong {
    display: block;
    font-size: 1.75rem;
    color: var(--primary-dark);
}

.stat-card span {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* About page: "What we offer" feature grid */
.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
    gap: 16px;
    margin-top: 6px;
}

.about-feature {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 12px;
    padding: 20px 22px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.about-feature h3 {
    margin: 0 0 10px;
    font-size: 1rem;
    color: var(--primary-deep);
}

.about-feature p {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.65;
}

/* About page: feature grid */
.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 14px;
}

.about-feature {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 12px;
    padding: 18px 20px;
}

.about-feature h3 {
    margin: 0 0 8px;
    font-size: 1rem;
    color: var(--primary-deep);
}

.about-feature p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

@media (max-width: 720px) {
    .about-features {
        grid-template-columns: 1fr;
    }
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 12px;
    overflow: hidden;
}

.data-table th,
.data-table td {
    text-align: left;
    padding: 12px 14px;
    border-bottom: 1px solid var(--bg-border);
    font-size: 0.875rem;
}

.data-table th {
    background: var(--bg-soft);
    color: var(--primary-deep);
    font-weight: 700;
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tbody tr:hover {
    background: var(--bg-page);
}

.row-actions {
    display: flex;
    gap: 10px;
}

.row-actions a {
    color: var(--primary-dark);
}

.inline-form {
    display: inline;
    margin: 0;
}

/* Status / badges */
.badge {
    display: inline-block;
    background: var(--bg-border);
    color: var(--primary-deep);
    font-size: 0.6875rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    margin-left: 6px;
    vertical-align: middle;
}

.status {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
}

.status-published { background: #dcfce7; color: #166534; }
.status-draft    { background: var(--bg-border); color: var(--primary-deep); }
.status-approved { background: #dcfce7; color: #166534; }
.status-pending  { background: #fef3c7; color: #92400e; }
.status-rejected { background: #fee2e2; color: #991b1b; }

/* Student answer submissions */
.answer-form {
    margin-top: 2px;
}

.answer-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.answer-status-row {
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.answer-badge {
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.4px;
}

.answer-feedback {
    font-size: 0.875rem;
    color: var(--text-main);
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: 8px;
    padding: 8px 12px;
}

.answer-feedback-visible {
    display: block;
    margin-top: 10px;
}

.answer-login-hint {
    margin: 0 0 10px;
    font-size: 0.875rem;
    color: var(--text-muted);
    background: var(--bg-soft);
    border: 1px dashed var(--accent-border);
    border-radius: 8px;
    padding: 10px 12px;
}

/* Admin: answer review cards */
.answer-card {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 6px solid var(--primary);
    border-radius: 12px;
    padding: 18px 20px;
    margin-bottom: 16px;
}

.answer-card-head {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.answer-student {
    font-weight: 700;
    color: var(--text-main);
}

.answer-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.answer-question {
    margin: 0 0 10px;
    font-size: 0.9375rem;
}

.answer-body {
    background: var(--bg-soft);
    border: 1px solid var(--bg-border);
    border-radius: 10px;
    padding: 14px;
    line-height: 1.7;
    white-space: pre-line;
    color: var(--text-main);
}

.answer-reviews {
    display: flex;
    gap: 14px;
    margin-top: 12px;
    align-items: flex-start;
    flex-wrap: wrap;
}

.reject-form textarea {
    width: 100%;
    min-width: 240px;
    padding: 8px 10px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    font-size: 0.875rem;
    font-family: inherit;
    margin-bottom: 8px;
    resize: vertical;
}

.filter-tabs {
    display: flex;
    gap: 8px;
    margin: 14px 0 22px;
    flex-wrap: wrap;
}

.filter-tabs a {
    padding: 6px 14px;
    border: 1px solid var(--bg-border);
    border-radius: 999px;
    font-size: 0.875rem;
    color: var(--text-muted);
    background: #fff;
}

.filter-tabs a.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    font-weight: 600;
}

.checkbox-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 12px 0 18px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9375rem;
    color: var(--text-main);
}

.badge-pill {
    display: inline-block;
    background: #ef4444;
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    min-width: 18px;
    line-height: 18px;
    border-radius: 999px;
    padding: 0 5px;
    text-align: center;
    vertical-align: middle;
}

/* Misc */
.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 30px;
    background: #fff;
    border: 1px dashed var(--accent-border);
    border-radius: 12px;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--bg-border);
    background: var(--header-bg);
    padding: 28px 0 18px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.footer-logo {
    max-height: 40px;
    width: auto;
    margin: 0 0 8px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 28px;
    text-align: left;
    margin-bottom: 24px;
}

.footer-col h3 {
    margin: 0 0 10px;
    font-size: 0.9375rem;
    color: var(--text-main);
}

.footer-about {
    line-height: 1.7;
    margin: 0;
    white-space: normal;
}

.footer-links,
.footer-contact {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links li,
.footer-contact li {
    margin-bottom: 6px;
}

.footer-links a,
.footer-contact a {
    color: var(--text-muted);
    text-decoration: none;
}

.footer-links a:hover,
.footer-contact a:hover {
    color: var(--primary);
}

.footer-contact li {
    line-height: 1.6;
}

.footer-bottom {
    margin: 0;
    padding-top: 14px;
    border-top: 1px solid var(--bg-border);
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }
}

/* Breadcrumbs */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-bottom: 18px;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--primary-dark);
}

.breadcrumb span:last-child {
    color: var(--text-main);
    font-weight: 600;
}

/* Section head */
.section-head {
    margin-bottom: 22px;
}

.section-head h1 {
    margin: 0 0 4px;
    font-size: 1.875rem;
    color: var(--primary-deep);
}

.section-head p {
    margin: 0;
    color: var(--text-muted);
}

.muted {
    color: var(--text-muted);
}

/* Class cards */
.class-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 28px;
}

.class-section {
    margin-top: 32px;
}

.class-section-title {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin: 0 0 4px;
    color: var(--primary-deep);
    font-size: 1.375rem;
}

.class-section-count {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--primary-dark);
    background: var(--bg-soft);
    border: 1px solid var(--bg-border);
    padding: 3px 10px;
    border-radius: 999px;
}

.chapters-grid {
    margin-top: 16px;
}

.class-card {
    display: block;
    background: #fff;
    border: 1px solid var(--bg-border);
    border-top: 6px solid var(--primary);
    border-radius: 14px;
    padding: 24px 20px;
    color: var(--text-main);
    transition: transform 0.12s ease, box-shadow 0.15s ease;
}

.class-card:hover {
    text-decoration: none;
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(var(--primary-rgb), 0.18);
    border-color: var(--accent-border);
}

.class-card h2 {
    margin: 0 0 12px;
    font-size: 1.375rem;
    color: var(--primary-deep);
}

.class-card h3 {
    margin: 0 0 12px;
    font-size: 1.0625rem;
    color: var(--primary-deep);
    line-height: 1.4;
}

.class-stats {
    display: flex;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 16px;
}

.class-link {
    display: inline-block;
    font-weight: 700;
    color: var(--primary-dark);
    font-size: 0.875rem;
    padding: 7px 14px;
    border: 1px solid var(--accent-border);
    border-radius: 999px;
    background: var(--bg-soft);
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.class-card:hover .class-link {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
}

/* Chapter list */
.chapter-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chapter-card {
    display: flex;
    align-items: center;
    gap: 18px;
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 6px solid var(--primary);
    border-radius: 12px;
    padding: 18px 20px;
    color: var(--text-main);
    transition: box-shadow 0.15s ease;
}

.chapter-card:hover {
    text-decoration: none;
    box-shadow: 0 6px 18px rgba(var(--primary-rgb), 0.14);
    border-color: var(--accent-border);
}

.chapter-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    background: var(--bg-border);
    color: var(--primary-deep);
    font-weight: 800;
    font-size: 1.125rem;
    border-radius: 12px;
}

.chapter-body {
    flex: 1;
    min-width: 0;
}

.chapter-body h2 {
    margin: 0 0 4px;
    font-size: 1.125rem;
}

.note-count {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.chapter-arrow {
    color: var(--primary-dark);
    font-size: 1.375rem;
    flex-shrink: 0;
}

/* Inline admin forms */
.form-inline-card {
    max-width: none;
    margin-bottom: 20px;
}

.form-inline-card h2 {
    margin: 0 0 12px;
    font-size: 1.125rem;
    color: var(--primary-deep);
}

.inline-fields {
    display: flex;
    align-items: flex-end;
    gap: 14px;
    flex-wrap: wrap;
}

.inline-fields .form-group {
    margin-bottom: 0;
    min-width: 220px;
    flex: 1;
}

.table-input {
    width: auto !important;
    display: inline-block;
    padding: 6px 8px;
    margin-right: 6px;
    font-size: 0.875rem;
}

.table-input-sm {
    width: 70px !important;
}

/* Page head + content */
.page-head {
    margin-bottom: 22px;
}

.page-head h1 {
    margin: 0 0 6px;
    font-size: 2rem;
    color: var(--primary-deep);
}

.page-head p {
    margin: 0;
    color: var(--text-muted);
}

.content-block {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 5px solid var(--primary);
    border-radius: 12px;
    padding: 24px;
    line-height: 1.7;
    color: var(--text-main);
}

/* Search */
.search-form {
    display: flex;
    gap: 10px;
    margin-top: 16px;
    max-width: 520px;
}

.search-form input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    font-size: 0.875rem;
}

.search-form input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.18);
}

/* Sub-navigation tabs */
.tab-nav {
    display: flex;
    gap: 8px;
    border-bottom: 2px solid var(--bg-border);
    margin-bottom: 24px;
}

.tab-nav a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
}

.tab-nav a:hover {
    text-decoration: none;
    color: var(--primary-dark);
}

.tab-nav a.active {
    color: var(--primary-dark);
    border-bottom-color: var(--primary);
}

.tab-count {
    background: var(--bg-border);
    color: var(--primary-deep);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 1px 8px;
    border-radius: 999px;
}

/* Questions */
.question-heading {
    margin: 28px 0 14px;
    color: var(--primary-deep);
}

.question-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 20px;
}

.q-card {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 6px solid var(--primary-light);
    border-radius: 12px;
    padding: 20px;
}

.q-text {
    margin: 0 0 14px;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.mcq-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mcq-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background 0.12s ease, border-color 0.12s ease;
}

.mcq-option:hover {
    background: var(--bg-soft);
}

.mcq-option input {
    accent-color: var(--primary);
}

.opt-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    flex-shrink: 0;
    background: var(--bg-border);
    color: var(--primary-deep);
    font-weight: 800;
    font-size: 0.75rem;
    border-radius: 6px;
}

.mcq-option.chosen-correct {
    background: #dcfce7;
    border-color: #22c55e;
}

.mcq-option.chosen-correct .opt-letter {
    background: #16a34a;
    color: #fff;
}

.mcq-option.chosen-wrong {
    background: #fee2e2;
    border-color: #ef4444;
}

.mcq-option.chosen-wrong .opt-letter {
    background: #dc2626;
    color: #fff;
}

.mcq-option.correct-highlight {
    border-color: #22c55e;
}

.mcq-option.correct-highlight:not(.chosen-correct) {
    background: #f0fdf4;
}

.mcq-feedback {
    margin-top: 12px;
}

.fb {
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.875rem;
}

.fb-correct { background: #dcfce7; color: #166534; }
.fb-wrong   { background: #fee2e2; color: #991b1b; }

.fb[hidden] {
    display: none;
}

.subj-answer {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.875rem;
    margin-bottom: 10px;
}

.subj-answer:focus {
    outline: none;
    border-color: var(--primary);
}

.model-answer {
    margin-top: 12px;
    padding: 12px;
    background: var(--bg-soft);
    border: 1px dashed var(--accent-border);
    border-radius: 8px;
    color: var(--text-main);
    line-height: 1.6;
    font-size: 0.875rem;
}

.mcq-option.selected {
    background: var(--bg-soft);
    border-color: var(--primary);
    box-shadow: inset 0 0 0 1px var(--primary);
}

.mcq-result {
    margin-top: 12px;
}

.mcq-explanation {
    margin-top: 8px;
    padding: 10px 12px;
    background: var(--bg-soft);
    border: 1px solid var(--bg-border);
    border-radius: 8px;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--primary-deep);
}

.check-box {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0 10px;
    padding: 14px 16px;
    background: var(--bg-soft);
    border: 1px solid var(--accent-border);
    border-radius: 10px;
}

.score-text {
    font-weight: 700;
    color: var(--primary-deep);
}

.btn-ghost {
    background: #fff;
    color: var(--primary);
    border-color: var(--accent-border);
}

.btn-ghost:hover {
    background: var(--bg-soft);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8125rem;
}

/* Admin questions */
.qtype {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.qtype-mcq        { background: #dcfce7; color: #166534; }
.qtype-subjective { background: var(--bg-border); color: #1e40af; }

.sub-heading {
    margin: 10px 0 8px;
    font-size: 1rem;
    color: var(--primary-deep);
}

.option-row {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 10px;
}

.option-row input[type="text"] {
    flex: 1;
    padding: 9px 12px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    font-size: 0.875rem;
}

.radio-inline {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8125rem;
    font-weight: 600;
    white-space: nowrap;
    cursor: pointer;
}

.radio-inline input {
    accent-color: var(--primary);
}

/* Contact messages */
.contact-message {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 12px;
    padding: 18px;
    margin-bottom: 14px;
}

.contact-message.unread {
    border-left: 6px solid var(--primary);
}

.contact-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.contact-subject {
    font-weight: 700;
    margin: 6px 0;
}

.contact-body {
    color: var(--text-main);
    line-height: 1.6;
}

.form-divider {
    border: none;
    border-top: 1px dashed var(--accent-border);
    margin: 20px 0;
}

.admin-bar.sub {
    background: var(--bg-page);
}

/* Banner slider */
.slider {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 30px;
    aspect-ratio: 16 / 6;
    min-height: 260px;
    max-height: 420px;
    background: #fff;
}

.slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.6s ease;
    pointer-events: none;
}

.slide.active {
    opacity: 1;
    pointer-events: auto;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.slide-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 24px;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.15), rgba(0, 0, 0, 0.55));
    color: #fff;
}

.slide-overlay h2 {
    margin: 0 0 8px;
    font-size: 2.125rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.slide-overlay p {
    margin: 0 0 14px;
    font-size: 1rem;
    max-width: 640px;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

.btn-light {
    background: #fff;
    color: var(--primary-deep);
}

.btn-light:hover {
    filter: brightness(0.95);
    color: var(--primary-dark);
}

.slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.85);
    border: none;
    color: var(--primary-deep);
    font-size: 1.25rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    z-index: 5;
    transition: background 0.15s ease;
}

.slider-arrow:hover {
    background: #fff;
}

.slider-arrow.prev { left: 14px; }
.slider-arrow.next { right: 14px; }

.slider-dots {
    position: absolute;
    bottom: 14px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 8px;
    z-index: 5;
}

.slider-dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    border: none;
    background: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    padding: 0;
}

.slider-dot.active {
    background: #fff;
    width: 24px;
}

/* Admin: banner + logo previews */
.banner-thumb {
    width: 90px;
    height: 48px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--bg-border);
    display: block;
}

.banner-preview {
    max-width: 320px;
    width: 100%;
    border-radius: 10px;
    border: 1px solid var(--bg-border);
}

.logo-preview {
    max-height: 44px;
    width: auto;
    vertical-align: middle;
    margin-right: 8px;
}

/* Admin profile */
.admin-user {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.avatar-sm {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-border);
}

.avatar-lg {
    max-width: 96px;
    max-height: 96px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--accent-border);
    vertical-align: middle;
    margin-right: 12px;
}

/* Contact us page */
.contact-info {
    max-width: 680px;
}

.contact-info-blurb {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--text-main);
}

.contact-details {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-details li {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 12px 16px;
    background: var(--bg-soft);
    border: 1px solid var(--bg-border);
    border-radius: 10px;
}

.cd-label {
    flex-shrink: 0;
    min-width: 90px;
    font-weight: 700;
    color: var(--primary-deep);
    font-size: 0.8125rem;
    text-transform: uppercase;
}

.cd-value {
    font-size: 0.9375rem;
    color: var(--text-main);
    word-break: break-word;
}

/* Buy a coffee section */
.coffee-card {
    margin-top: 28px;
    display: flex;
    align-items: center;
    gap: 28px;
    background: linear-gradient(135deg, var(--bg-soft), var(--bg-border));
    border: 1px solid var(--accent-border);
    border-radius: 16px;
    padding: 28px;
    flex-wrap: wrap;
}

.coffee-text {
    flex: 1 1 300px;
}

.coffee-text h2 {
    margin: 0 0 10px;
    color: var(--primary-deep);
    font-size: 1.5rem;
}

.coffee-text p {
    margin: 0 0 10px;
    color: var(--text-main);
    line-height: 1.6;
}

.coffee-info {
    padding: 10px 14px;
    background: #fff;
    border: 1px solid var(--accent-border);
    border-radius: 10px;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--primary-deep);
    word-break: break-word;
    white-space: pre-line;
}

.coffee-qr {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    background: #fff;
    border: 2px dashed var(--accent-border);
    border-radius: 14px;
    padding: 14px;
}

.coffee-qr img {
    display: block;
    max-width: 190px;
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.qr-placeholder {
    display: block;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--primary);
    font-weight: 700;
    border: 2px dashed var(--accent-border);
    border-radius: 10px;
    margin-bottom: 6px;
}

.qr-open {
    color: var(--primary-dark);
    font-weight: 700;
    font-size: 0.8125rem;
}

.qr-preview {
    max-width: 150px;
    max-height: 150px;
    border: 1px solid var(--bg-border);
    border-radius: 10px;
    vertical-align: middle;
    margin-right: 8px;
}

/* Theme editor */
.theme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 16px;
    margin: 8px 0 16px;
}

.theme-grid input[type="color"] {
    width: 100%;
    height: 44px;
    padding: 4px;
    border: 1px solid var(--bg-border);
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
}

.form-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Class group: shared answers */
.group-answers {
    margin-top: 12px;
    border: 1px solid var(--bg-border);
    border-radius: 10px;
    background: #fff;
}

.group-answers summary {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 10px 14px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-deep);
    list-style: none;
}

.group-answers summary::-webkit-details-marker {
    display: none;
}

.group-answers summary::before {
    content: "\25B8";
    transition: transform 0.15s ease;
    color: var(--primary);
}

.group-answers[open] summary::before {
    transform: rotate(90deg);
}

.ga-title {
    color: var(--text-main);
}

.group-answers-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 0 14px 14px;
}

.group-answer {
    background: var(--bg-soft);
    border: 1px solid var(--bg-border);
    border-radius: 10px;
    padding: 12px 14px;
}

.group-answer-self {
    border-color: var(--primary);
    box-shadow: inset 3px 0 0 var(--primary);
}

.ga-self-tag {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 999px;
    padding: 1px 8px;
}

.ga-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.ga-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 0.8125rem;
    font-weight: 700;
}

.ga-name {
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--text-main);
}

.ga-date {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.ga-body {
    line-height: 1.7;
    white-space: pre-line;
    color: var(--text-main);
}

/* Class group page */
.group-stats {
    display: flex;
    gap: 16px;
    margin: 6px 0 24px;
    flex-wrap: wrap;
}

.group-stats .stat-card {
    min-width: 140px;
    padding: 16px;
}

.group-stats .stat-card .stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-dark);
    line-height: 1;
    margin-bottom: 6px;
}

.group-stats .stat-card .stat-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.group-class-picker {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 6px 0 18px;
    font-size: 0.875rem;
}

.group-class-picker select {
    padding: 7px 10px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    font-family: inherit;
}

.chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 10px 0 20px;
}

.chip-self {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.group-chapter {
    margin-bottom: 22px;
}

.group-chapter-title {
    font-size: 1.05rem;
    color: var(--primary-deep);
    border-bottom: 2px solid var(--bg-border);
    padding-bottom: 6px;
    margin-bottom: 14px;
}

.group-question {
    margin-bottom: 16px;
}

.group-answers-section {
    margin-top: 8px;
}

.group-summary {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 5px solid var(--primary);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 24px;
}

.group-summary h2 {
    margin: 0 0 6px;
    font-size: 1.05rem;
    color: var(--primary-deep);
}

.group-summary p {
    margin: 0 0 12px;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Admin: student list */
.student-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

.student-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 5px solid var(--primary);
    border-radius: 12px;
    padding: 14px 18px;
}

.student-info {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.student-name {
    font-weight: 700;
    color: var(--text-main);
}

.student-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.student-assign {
    display: flex;
    align-items: center;
    gap: 10px;
}

.student-assign select {
    padding: 7px 10px;
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    font-family: inherit;
    background: #fff;
}

/* Registration helper text */
.field-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Admin: class-wise / chapter-wise notes overview */
.admin-group {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 5px solid var(--primary);
    border-radius: 12px;
    margin-bottom: 14px;
    overflow: hidden;
}

.admin-group[open] {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.admin-group > summary {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    cursor: pointer;
    padding: 14px 18px;
    list-style: none;
    font-size: 0.9375rem;
}

.admin-group > summary::-webkit-details-marker {
    display: none;
}

.admin-group > summary::before {
    content: "\25B8";
    color: var(--primary);
    transition: transform 0.15s ease;
}

.admin-group[open] > summary::before {
    transform: rotate(90deg);
}

.admin-group-title {
    font-weight: 700;
    color: var(--text-main);
}

.admin-group-count {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.admin-group-body {
    padding: 4px 18px 18px 30px;
}

.admin-group-nested {
    border-left: 4px solid var(--accent-border);
    margin: 10px 0;
}

.admin-group-nested > summary {
    padding: 10px 16px;
}

.admin-group-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin: 10px 0;
    font-size: 0.875rem;
}

.admin-group-actions a:first-child {
    color: var(--text-muted);
}

/* Admin: class cards with inline chapter management */
.class-add-block {
    margin-bottom: 22px;
}

.class-add-block .admin-group-body .form-card {
    margin: 0;
    box-shadow: none;
}

.class-admin-card {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-left: 5px solid var(--primary);
    border-radius: 12px;
    margin-bottom: 20px;
    overflow: hidden;
}

.class-admin-head {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding: 15px 20px;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--bg-border);
}

.class-admin-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
}

.class-admin-counts {
    margin-left: 12px;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.class-admin-head-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.class-admin-body {
    padding: 18px 20px 20px;
}

.class-admin-edit {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    flex-wrap: wrap;
    padding-bottom: 16px;
    border-bottom: 1px dashed var(--accent-border);
}

.class-admin-edit .form-group {
    margin: 0;
}

.class-admin-edit label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.class-admin-edit input[type="text"].table-input {
    min-width: 240px;
}

.class-admin-subhead {
    font-size: 0.95rem;
    color: var(--primary-deep);
    margin: 18px 0 10px;
}

.class-admin-links a {
    color: var(--primary-dark);
}

.chapter-add-form {
    margin-top: 18px;
    padding-top: 16px;
    border-top: 2px solid var(--bg-border);
}

.chapter-add-form h3 {
    margin: 0 0 12px;
    font-size: 0.95rem;
    color: var(--primary-deep);
}

.chapter-add-form .inline-fields {
    align-items: flex-end;
}

.class-admin-links,
.chapter-add-form {
    font-size: 0.875rem;
}

/* Chapter files & downloads */
.section-subtitle {
    margin: 32px 0 0;
    font-size: 1.25rem;
    color: var(--primary-deep);
}

.file-section {
    margin-top: 8px;
}

.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.file-card {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: box-shadow 0.15s ease;
}

.file-card:hover {
    box-shadow: 0 8px 20px rgba(var(--primary-rgb), 0.15);
}

.file-thumb {
    display: block;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--bg-border);
    background: var(--bg-soft);
}

.file-thumb img {
    display: block;
    width: 100%;
    height: 140px;
    object-fit: cover;
}

.file-icon {
    height: 100px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.05rem;
    font-weight: 800;
    letter-spacing: 0.6px;
    color: #fff;
    background: var(--primary);
}

.file-icon-pdf {
    background: #d64545;
}

.file-icon-doc {
    background: #2b6cb0;
}

.file-info {
    display: flex;
    flex-direction: column;
    gap: 3px;
    flex: 1;
}

.file-title {
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.35;
}

.file-meta {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.file-type-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--bg-border);
    color: var(--primary-deep);
    letter-spacing: 0.4px;
}

.file-type-badge.file-type-pdf {
    background: #fde2e2;
    color: #a12b2b;
}

.file-type-badge.file-type-doc {
    background: #dbeafe;
    color: #1d4ed8;
}

.file-type-badge.file-type-image {
    background: #dcfce7;
    color: #15803d;
}

.file-type-badge.file-type-text {
    background: #eef2ff;
    color: #4338ca;
}

.admin-files-section {
    margin-top: 36px;
    padding-top: 20px;
    border-top: 2px solid var(--bg-border);
}

.admin-files-section .form-inline-card {
    margin: 16px 0 20px;
}

.admin-files-section .inline-fields {
    align-items: flex-end;
}

.inline-form {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* Notes filters + pagination */
.notes-filter-form {
    margin-top: 16px;
}

.filter-fields {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: flex-end;
}

.filter-fields .form-group {
    flex: 1 1 180px;
    min-width: 160px;
}

.filter-actions {
    display: flex;
    gap: 8px;
}

.notes-result-count {
    margin: 18px 0 0;
}

.pagination {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin: 28px 0;
}

.page-link {
    display: inline-block;
    padding: 7px 12px;
    border: 1px solid var(--bg-border);
    border-radius: 8px;
    background: #fff;
    color: var(--text-main);
    font-size: 0.875rem;
}

.page-link:hover {
    border-color: var(--primary);
    color: var(--primary-dark);
    text-decoration: none;
}

.page-link.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.file-group-title {
    margin: 26px 0 0;
    font-size: 1rem;
    color: var(--primary-deep);
}

/* Admin questions toolbar */
.question-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin: 20px 0;
}

.question-toolbar .table-input {
    max-width: 300px;
}

.filter-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.filter-pill {
    border: 1px solid var(--bg-border);
    background: #fff;
    border-radius: 999px;
    padding: 7px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
}

.filter-pill:hover {
    border-color: var(--primary);
    color: var(--primary-dark);
}

.filter-pill.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* Class group member roster */
.member-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.member-name {
    background: #fff;
    border: 1px solid var(--accent-border);
    color: var(--primary-deep);
    font-size: 0.875rem;
    font-weight: 600;
    padding: 7px 16px;
    border-radius: 999px;
}

.member-self {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* ------------------------------------------------ mobile */
@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
        gap: 6px 10px;
        padding: 10px 14px;
    }

    .brand {
        font-size: 1.25rem;
    }

    .site-logo {
        max-height: 32px;
        width: auto;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .main-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 2px;
        padding-top: 10px;
        border-top: 1px solid var(--bg-border);
        margin-top: 4px;
    }

    body.nav-open .main-nav {
        display: flex;
    }

    .main-nav a {
        padding: 12px 4px;
        font-size: 0.9375rem;
        border-bottom: 1px solid var(--bg-border);
    }

    .main-nav a.btn {
        width: 100%;
        text-align: center;
        margin: 4px 0 0;
        padding: 11px 12px;
    }

    .main-nav a.active::after {
        left: 0;
        right: 100%;
        bottom: -1px;
        height: 3px;
    }

    main.container {
        padding: 24px 20px 40px;
    }

    .slider {
        aspect-ratio: 16 / 9;
        min-height: 190px;
        max-height: 320px;
        margin-bottom: 24px;
    }

    .slide-overlay {
        padding: 16px;
    }

    .slide-overlay h2 {
        font-size: 1.375rem;
    }

    .slide-overlay p {
        font-size: 0.875rem;
        max-width: 100%;
    }

    .slider-arrow {
        width: 32px;
        height: 32px;
        font-size: 0.95rem;
    }

    .slider-arrow.prev { left: 8px; }
    .slider-arrow.next { right: 8px; }

    .slider-dots { bottom: 10px; }

    .hero {
        padding: 28px 14px;
    }

    .hero h1 {
        font-size: 1.625rem;
    }

    .hero p {
        font-size: 0.9375rem;
    }

    .hero-cta .btn {
        min-width: 140px;
        padding: 10px 16px;
        font-size: 0.875rem;
    }

    .section-head h1,
    .page-head h1 {
        font-size: 1.5rem;
    }

    .page-head p {
        font-size: 0.9375rem;
    }

    .data-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    .data-table th,
    .data-table td {
        padding: 10px 12px;
    }

    .form-card {
        padding: 18px;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        font-size: 0.9375rem;
    }

    .cta-panel {
        padding: 32px 16px;
    }

    .cta-panel h2 {
        font-size: 1.375rem;
    }

    .footer-bottom {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .main-nav a {
        font-size: 0.875rem;
    }

    .hero-cta .btn {
        min-width: 100%;
    }

    .hero h1 {
        font-size: 1.4375rem;
    }

    .slide-overlay h2 {
        font-size: 1.1875rem;
    }

    .slider {
        min-height: 170px;
        max-height: 260px;
    }

    .class-grid {
        gap: 14px;
    }

    .stat-card strong {
        font-size: 1.5rem;
    }
}

/* Quick add */
.quick-add {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 14px;
    padding: 4px 22px 22px;
    margin-bottom: 8px;
}

.quick-add h2 {
    margin: 0 0 4px;
    color: var(--primary-deep);
}

.qa-tabs {
    display: flex;
    gap: 6px;
    border-bottom: 2px solid var(--bg-border);
}

.qa-tab {
    border: 0;
    background: none;
    padding: 12px 18px;
    font: inherit;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
}

.qa-tab:hover {
    color: var(--primary-dark);
}

.qa-tab.active {
    color: var(--primary-dark);
    border-bottom-color: var(--primary);
}

.qa-panel {
    display: none;
    padding-top: 18px;
}

.qa-panel.active {
    display: block;
}

.quick-add-form {
    background: var(--bg-soft);
    border-style: dashed;
    max-width: none;
    margin: 0;
}

.quick-add-form .sub-heading {
    margin-top: 16px;
}

/* Pagination */
.pagination {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin: 18px 0 4px;
}

.pager-link,
.pager-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid var(--bg-border);
    background: #fff;
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.9rem;
}

.pager-link:hover,
.pager-number:hover {
    border-color: var(--primary);
    color: var(--primary-dark);
}

.pager-number.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    font-weight: 700;
}

.q-range {
    white-space: nowrap;
    font-size: 0.88rem;
}

/* AI chat */
.ai-fab {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 1000;
    width: 58px;
    height: 58px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.5px;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(var(--primary-rgb), 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.ai-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(var(--primary-rgb), 0.5);
}

.ai-fab-icon {
    background: #fff;
    color: var(--primary-dark);
    border-radius: 10px;
    padding: 3px 7px;
    font-size: 0.85rem;
}

.ai-panel {
    position: fixed;
    right: 20px;
    bottom: 88px;
    z-index: 1000;
    width: 360px;
    max-width: calc(100vw - 32px);
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 14px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.25);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.ai-panel[hidden] {
    display: none;
}

.ai-panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--primary);
    color: #fff;
}

.ai-panel-title {
    display: flex;
    flex-direction: column;
}

.ai-panel-sub {
    font-size: 0.75rem;
    opacity: 0.9;
}

.ai-close {
    background: transparent;
    border: none;
    color: #fff;
    font-size: 1.3rem;
    line-height: 1;
    cursor: pointer;
}

.ai-msgs {
    flex: 1;
    overflow-y: auto;
    padding: 14px;
    background: var(--bg-page);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-widget-msgs {
    height: 320px;
}

.ai-msg {
    max-width: 85%;
    display: flex;
    flex-direction: column;
}

.ai-msg-user {
    align-self: flex-end;
    align-items: flex-end;
}

.ai-msg-bot {
    align-self: flex-start;
    align-items: flex-start;
}

.ai-msg-who {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 3px;
}

.ai-msg-body {
    padding: 9px 12px;
    border-radius: 12px;
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 0.92rem;
    line-height: 1.5;
}

.ai-msg-user .ai-msg-body {
    background: var(--primary);
    color: #fff;
    border-bottom-right-radius: 3px;
}

.ai-msg-bot .ai-msg-body {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-bottom-left-radius: 3px;
}

.ai-input {
    display: flex;
    gap: 8px;
    padding: 10px;
    border-top: 1px solid var(--bg-border);
    background: #fff;
}

.ai-input input {
    flex: 1;
    border: 1px solid var(--bg-border);
    border-radius: 8px;
    padding: 9px 12px;
    font-size: 0.92rem;
    font-family: inherit;
}

.ai-input input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--bg-soft);
}

.ai-foot {
    padding: 8px 12px;
    border-top: 1px dashed var(--bg-border);
    font-size: 0.8rem;
    text-align: center;
    background: #fff;
}

.ai-page {
    max-width: 760px;
    margin: 0 auto 40px;
}

.ai-page-box {
    background: #fff;
    border: 1px solid var(--bg-border);
    border-radius: 14px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.ai-page-msgs {
    height: 480px;
}

.ai-note {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 10px;
    margin: 0;
}

@media (max-width: 640px) {
    .ai-panel {
        right: 12px;
        left: 12px;
        bottom: 80px;
        width: auto;
    }
}