@import url('https://fonts.googleapis.com/css2?family=Hind+Siliguri:wght@400;500;600;700;800&display=swap');
:root {
    --bg: #f6f7fb;
    --surface: #ffffff;
    --surface-2: #eef2ff;
    --text: #172033;
    --muted: #657084;
    --border: #dfe5f1;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #0f9f6e;
    --warning: #f59e0b;
    --danger: #dc2626;
    --purple: #7c3aed;
    --shadow: 0 18px 45px rgba(25, 39, 74, .10);
    --radius: 22px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Hind Siliguri", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); line-height: 1.65; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.site-header, .admin-header { background: rgba(255,255,255,.88); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.header-inner, .admin-header-inner, .footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 14px 0; }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand.centered { justify-content: center; margin-bottom: 20px; }
.brand-mark { width: 44px; height: 44px; border-radius: 15px; display: grid; place-items: center; background: linear-gradient(135deg, var(--primary), var(--purple)); color: #fff; font-weight: 900; letter-spacing: .5px; box-shadow: var(--shadow); }
.brand small { display: block; color: var(--muted); font-size: 12px; margin-top: -2px; }
.top-nav { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.top-nav a { padding: 9px 13px; color: var(--muted); border-radius: 999px; }
.top-nav a:hover { background: var(--surface-2); color: var(--primary); }
.hero { padding: 58px 0 34px; background: radial-gradient(circle at top left, #dbeafe 0, transparent 35%), radial-gradient(circle at top right, #ede9fe 0, transparent 30%); }
.hero-grid { display: grid; grid-template-columns: 1.6fr .8fr; gap: 28px; align-items: center; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; color: var(--primary); font-weight: 800; font-size: 12px; margin: 0 0 8px; }
h1, h2, h3 { line-height: 1.25; margin-top: 0; }
.hero h1 { font-size: clamp(32px, 6vw, 58px); margin-bottom: 16px; letter-spacing: -.04em; }
.hero-text { color: var(--muted); font-size: 18px; max-width: 760px; }
.hero-card, .admin-card, .detail-card, .empty-state, .stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-card { padding: 26px; }
.hero-card ul { padding-left: 22px; color: var(--muted); }
.search-bar { display: grid; grid-template-columns: minmax(220px, 1.4fr) minmax(150px, .8fr) minmax(150px, .8fr) minmax(130px, .7fr) auto; gap: 10px; background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: 10px; box-shadow: var(--shadow); margin-top: 22px; }
input, select, textarea { width: 100%; border: 1px solid var(--border); border-radius: 14px; padding: 12px 13px; font: inherit; color: var(--text); background: #fff; }
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 3px solid rgba(37, 99, 235, .15); border-color: var(--primary); }
button, .primary-btn, .ghost-btn, .icon-btn { border: 0; border-radius: 14px; padding: 11px 16px; font: inherit; cursor: pointer; display: inline-flex; justify-content: center; align-items: center; gap: 6px; }
.primary-btn, .search-bar button { background: var(--primary); color: #fff; font-weight: 800; }
.primary-btn:hover, .search-bar button:hover { background: var(--primary-dark); }
.ghost-btn { background: var(--surface-2); color: var(--primary); border: 1px solid #c7d2fe; }
.ghost-btn.danger, .icon-btn.danger { color: var(--danger); background: #fef2f2; border-color: #fecaca; }
.icon-btn { background: #f8fafc; border: 1px solid var(--border); color: var(--muted); padding: 9px 11px; }
.icon-btn.active, .question-card.is-bookmarked [data-local-action="bookmark"] { color: #a16207; background: #fef3c7; border-color: #fde68a; }
.question-card.is-highlighted, .detail-card.is-highlighted { outline: 3px solid rgba(245, 158, 11, .35); background: #fffbeb; }
.is-hidden-local { display: none !important; }
.full { width: 100%; }
.large { padding: 14px 24px; }
.muted { color: var(--muted); }
.center-text { text-align: center; }
.layout-grid { display: grid; grid-template-columns: 280px 1fr; gap: 26px; padding: 34px 0 60px; }
.chapter-panel { position: sticky; top: 86px; align-self: start; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.chapter-panel h2 { font-size: 20px; }
.chapter-link { display: flex; justify-content: space-between; gap: 12px; padding: 12px 14px; color: var(--muted); border-radius: 14px; margin: 5px 0; }
.chapter-link:hover, .chapter-link.active { background: var(--surface-2); color: var(--primary); }
.chapter-link span { font-weight: 800; }
.local-actions { display: grid; gap: 8px; margin-top: 20px; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 20px; }
.section-heading h1, .section-heading h2 { margin: 0; }
.mini-link { color: var(--primary); font-weight: 700; }
.question-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.question-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform .18s ease, box-shadow .18s ease; }
.question-card:hover { transform: translateY(-3px); box-shadow: 0 22px 55px rgba(25, 39, 74, .14); }
.card-image { width: 100%; height: 190px; object-fit: cover; background: #e5e7eb; }
.card-body { padding: 20px; }
.card-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--muted); font-size: 13px; margin-bottom: 10px; }
.badge, .status { display: inline-flex; align-items: center; border-radius: 999px; padding: 4px 10px; font-weight: 800; font-size: 12px; }
.badge-blue { background: #dbeafe; color: #1d4ed8; }
.badge-green { background: #dcfce7; color: #15803d; }
.badge-purple { background: #ede9fe; color: #6d28d9; }
.status.published { background: #dcfce7; color: #15803d; }
.status.draft { background: #fef3c7; color: #a16207; }
.question-card h3 { margin-bottom: 8px; font-size: 21px; }
.question-card p { color: var(--muted); margin-top: 0; }
.tiny-tags { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0; }
.tiny-tags span { background: #f1f5f9; color: #475569; padding: 5px 9px; border-radius: 999px; font-size: 12px; }
.card-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.empty-state { text-align: center; padding: 45px 24px; color: var(--muted); }
.alert { border-radius: 16px; padding: 12px 14px; margin: 14px 0; border: 1px solid transparent; }
.alert-success { background: #ecfdf5; color: #047857; border-color: #bbf7d0; }
.alert-error { background: #fef2f2; color: #b91c1c; border-color: #fecaca; }
.site-footer { color: var(--muted); border-top: 1px solid var(--border); background: #fff; }
.question-page { padding: 34px 0 60px; }
.breadcrumb { color: var(--muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--primary); font-weight: 700; }
.detail-card { padding: 26px; }
.detail-head { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.detail-head h1 { font-size: clamp(28px, 4vw, 44px); margin-bottom: 0; }
.compact-actions { justify-content: flex-end; }
.rich-text { white-space: normal; color: #233044; font-size: 17px; }
.answer-text { background: #f8fafc; border: 1px solid var(--border); padding: 18px; border-radius: 18px; }
.answer-image { margin: 16px 0; border: 1px solid var(--border); border-radius: 18px; overflow: hidden; background: #fff; }
.answer-image img { width: 100%; max-height: 520px; object-fit: contain; background: #f8fafc; }
.answer-image figcaption { padding: 9px 12px; color: var(--muted); font-size: 13px; }
.answer-carousel { position: relative; }
.carousel-track { overflow: hidden; }
.carousel-slide { display: none; min-height: 260px; animation: fadeIn .18s ease; }
.carousel-slide.active { display: block; }
@keyframes fadeIn { from { opacity: .6; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.carousel-controls { display: flex; align-items: center; justify-content: space-between; gap: 10px; border-top: 1px solid var(--border); padding-top: 16px; margin-top: 20px; }
.carousel-controls button { background: var(--surface-2); color: var(--primary); border: 1px solid #c7d2fe; font-weight: 800; }
[data-carousel-dots] { display: flex; gap: 6px; align-items: center; }
.dot { width: 10px; height: 10px; border-radius: 50%; padding: 0; background: #cbd5e1 !important; border: 0 !important; }
.dot.active { background: var(--primary) !important; }
.option-list { display: grid; gap: 10px; margin: 12px 0 20px; }
.option { border: 1px solid var(--border); background: #fff; padding: 12px 14px; border-radius: 15px; display: flex; gap: 8px; align-items: center; }
.option.correct { border-color: #86efac; background: #f0fdf4; color: #166534; }
.option span { margin-left: auto; background: #dcfce7; color: #15803d; font-weight: 800; border-radius: 999px; padding: 2px 8px; font-size: 12px; }
.part-list { display: grid; gap: 10px; margin: 14px 0 22px; }
details { border: 1px solid var(--border); border-radius: 16px; background: #fff; padding: 12px 15px; }
summary { font-weight: 800; cursor: pointer; }
.code-box { position: relative; border-radius: 18px; overflow: hidden; border: 1px solid #1e293b; background: #0f172a; }
.code-box pre { margin: 0; padding: 20px; overflow: auto; color: #e2e8f0; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: 14px; }
.copy-code { position: absolute; top: 10px; right: 10px; background: #fff; color: #0f172a; font-weight: 800; padding: 6px 10px; border-radius: 10px; }
.modal { display: none; position: fixed; inset: 0; z-index: 100; }
.modal.show { display: block; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(15, 23, 42, .58); backdrop-filter: blur(6px); }
.modal-card { position: relative; width: min(930px, calc(100% - 26px)); max-height: calc(100vh - 40px); margin: 20px auto; overflow: auto; background: var(--surface); border-radius: 26px; box-shadow: 0 30px 90px rgba(0,0,0,.35); padding: 24px; }
.modal-close { position: sticky; top: 0; float: right; z-index: 2; width: 40px; height: 40px; border-radius: 50%; background: #f1f5f9; color: var(--text); font-size: 28px; padding: 0; }
.modal-titlebar { display: flex; justify-content: space-between; gap: 14px; margin-bottom: 20px; clear: both; }
.loader { padding: 50px; text-align: center; color: var(--muted); }
.login-body { min-height: 100vh; display: grid; place-items: center; background: radial-gradient(circle at top left, #dbeafe 0, transparent 35%), var(--bg); padding: 24px; }
.login-card { width: min(440px, 100%); background: var(--surface); border: 1px solid var(--border); border-radius: 28px; box-shadow: var(--shadow); padding: 28px; display: grid; gap: 14px; }
.login-card.wide { width: min(560px, 100%); }
.install-note { background: #f8fafc; border: 1px dashed var(--border); border-radius: 18px; padding: 14px; color: var(--muted); }
.admin-body { background: #f8fafc; }
.admin-shell { display: grid; grid-template-columns: 240px 1fr; gap: 22px; padding: 24px 0 60px; }
.admin-sidebar { position: sticky; top: 86px; align-self: start; background: #fff; border: 1px solid var(--border); border-radius: 22px; padding: 12px; box-shadow: var(--shadow); }
.admin-sidebar a { display: block; padding: 12px 14px; border-radius: 14px; color: var(--muted); font-weight: 700; }
.admin-sidebar a:hover { background: var(--surface-2); color: var(--primary); }
.admin-content { min-width: 0; }
.admin-card { padding: 22px; margin-bottom: 18px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 18px; }
.stat-card { padding: 20px; }
.stat-card span { color: var(--muted); display: block; }
.stat-card strong { font-size: 34px; }
.admin-grid-2 { display: grid; grid-template-columns: 420px 1fr; gap: 20px; align-items: start; }
.form-grid { display: grid; gap: 14px; }
.form-grid.three { grid-template-columns: repeat(3, 1fr); }
.big-form { display: grid; gap: 18px; }
.form-section { border: 1px solid var(--border); border-radius: 20px; padding: 18px; display: grid; gap: 14px; background: #fff; }
.checkbox-label { display: flex; align-items: center; gap: 9px; }
.checkbox-label input { width: auto; }
.table-wrap { overflow: auto; }
.data-table { width: 100%; border-collapse: collapse; min-width: 720px; }
.data-table th, .data-table td { text-align: left; padding: 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.data-table th { color: var(--muted); font-size: 13px; }
.row-actions { display: flex; gap: 9px; flex-wrap: wrap; align-items: center; }
.row-actions form { display: inline; }
.link-btn, .link-danger { background: none; border: 0; padding: 0; color: var(--primary); font-weight: 700; cursor: pointer; }
.link-danger { color: var(--danger); }
.filter-form { display: grid; grid-template-columns: 1fr 180px 160px auto; gap: 10px; }
.repeat-row { display: grid; grid-template-columns: 70px 90px 1fr 1.2fr; gap: 10px; align-items: start; border: 1px solid var(--border); border-radius: 18px; padding: 12px; background: #f8fafc; }
.mcq-row { display: grid; grid-template-columns: 34px 70px 1fr; gap: 10px; align-items: center; margin-bottom: 8px; }
.mcq-row input[type="radio"] { width: auto; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }
.image-admin-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
.image-admin-item { border: 1px solid var(--border); border-radius: 16px; overflow: hidden; padding: 8px; background: #f8fafc; display: grid; gap: 7px; }
.image-admin-item img { height: 110px; width: 100%; object-fit: cover; border-radius: 12px; }
.image-admin-item input { width: auto; }
.sticky-submit { position: sticky; bottom: 0; display: flex; gap: 10px; align-items: center; background: rgba(248,250,252,.88); backdrop-filter: blur(12px); padding: 14px; border: 1px solid var(--border); border-radius: 20px; }
hr { border: 0; border-top: 1px solid var(--border); width: 100%; }
@media (max-width: 980px) {
    .hero-grid, .layout-grid, .admin-shell, .admin-grid-2 { grid-template-columns: 1fr; }
    .chapter-panel, .admin-sidebar { position: static; }
    .search-bar, .filter-form { grid-template-columns: 1fr; }
    .question-grid, .stats-grid { grid-template-columns: 1fr 1fr; }
    .form-grid.three { grid-template-columns: 1fr; }
    .repeat-row { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
    .container { width: min(100% - 20px, 1180px); }
    .header-inner, .admin-header-inner, .detail-head, .modal-titlebar, .footer-inner { flex-direction: column; align-items: flex-start; }
    .question-grid, .stats-grid { grid-template-columns: 1fr; }
    .hero { padding-top: 32px; }
    .hero-card, .detail-card, .admin-card, .modal-card { border-radius: 18px; padding: 16px; }
    .carousel-controls { flex-wrap: wrap; }
    .mcq-row { grid-template-columns: 30px 60px 1fr; }
}

/* Final admin-only colorful classroom UI */
:root {
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --pink: #ec4899;
    --cyan: #06b6d4;
    --orange: #f97316;
    --green: #22c55e;
    --soft-blue: #eef2ff;
    --soft-pink: #fdf2f8;
    --soft-green: #ecfdf5;
    --soft-orange: #fff7ed;
}
body { font-family: "Hind Siliguri", system-ui, sans-serif !important; background: radial-gradient(circle at top left, rgba(99,102,241,.16), transparent 32%), radial-gradient(circle at top right, rgba(236,72,153,.12), transparent 28%), #f8fafc; }
.admin-header { background: rgba(255,255,255,.86); box-shadow: 0 8px 25px rgba(79,70,229,.08); }
.admin-sidebar { background: linear-gradient(180deg, #ffffff, #f8fbff); border-color: #dbeafe; }
.admin-sidebar a { margin-bottom: 6px; }
.admin-sidebar a.active, .admin-sidebar a:hover { background: linear-gradient(135deg, #eef2ff, #fdf2f8); color: var(--primary); box-shadow: inset 4px 0 0 var(--primary); }
.brand-mark { background: linear-gradient(135deg, #4f46e5, #ec4899, #06b6d4); }
.primary-btn { background: linear-gradient(135deg, #4f46e5, #7c3aed); box-shadow: 0 10px 22px rgba(79,70,229,.22); }
.primary-btn:hover { background: linear-gradient(135deg, #4338ca, #6d28d9); }
.ghost-btn { background: #f5f7ff; border-color: #c7d2fe; }
.toolbar-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.hero-mini { display: flex; justify-content: space-between; gap: 22px; align-items: center; background: linear-gradient(135deg, #ffffff, #eef2ff 50%, #fdf2f8); }
.colorful-stats .stat-card { color: #fff; border: 0; overflow: hidden; position: relative; }
.colorful-stats .stat-card span, .colorful-stats .stat-card strong { color: #fff; }
.stat-blue { background: linear-gradient(135deg, #2563eb, #4f46e5); }
.stat-purple { background: linear-gradient(135deg, #7c3aed, #ec4899); }
.stat-green { background: linear-gradient(135deg, #059669, #22c55e); }
.stat-orange { background: linear-gradient(135deg, #ea580c, #f59e0b); }
.badge-orange { background: #ffedd5; color: #c2410c; }
.classroom-filter { grid-template-columns: 1.3fr repeat(6, minmax(130px, .8fr)) auto auto; }
.manage-filter { grid-template-columns: 1.3fr repeat(4, minmax(150px, .8fr)) auto; }
.class-summary { background: linear-gradient(135deg, #eef2ff, #f8fafc); font-size: 18px; }
.class-summary strong { font-size: 28px; color: var(--primary); }
.question-title-list { display: grid; gap: 10px; }
.question-title-list.compact-list a { display: grid; gap: 3px; padding: 13px 15px; border: 1px solid var(--border); border-radius: 16px; background: #fff; }
.question-title-list.compact-list small { color: var(--muted); }
.question-list-item { border: 1px solid #dbeafe; border-radius: 20px; background: #fff; box-shadow: 0 14px 35px rgba(30,41,59,.07); overflow: hidden; padding: 0; }
.question-list-item summary { list-style: none; display: grid; gap: 8px; padding: 17px 20px; cursor: pointer; background: linear-gradient(135deg, #ffffff, #f8fbff); }
.question-list-item summary::-webkit-details-marker { display: none; }
.question-list-item[open] summary { border-bottom: 1px solid #e2e8f0; background: linear-gradient(135deg, #eef2ff, #fff); }
.title-text { font-size: 22px; font-weight: 800; color: #172033; }
.meta-line { display: flex; gap: 8px; flex-wrap: wrap; color: var(--muted); font-size: 14px; align-items: center; }
.answer-panel { padding: 20px; display: grid; gap: 16px; background: #fbfdff; }
.content-block { border: 1px solid #e2e8f0; border-radius: 18px; padding: 16px; background: #fff; }
.content-block h3, .answer-text h3 { margin-bottom: 8px; color: #4338ca; }
.stimulus-block { background: #fff7ed; border-color: #fed7aa; }
.explanation-box { border: 1px solid #bfdbfe; background: #eff6ff; border-radius: 18px; padding: 16px; }
.answer-actions { border-top: 1px dashed #cbd5e1; padding-top: 12px; }
.font-large .rich-text, .font-large .answer-panel, .font-large .option { font-size: 20px; }
.font-large .title-text { font-size: 25px; }
.font-xlarge .rich-text, .font-xlarge .answer-panel, .font-xlarge .option { font-size: 24px; line-height: 1.85; }
.font-xlarge .title-text { font-size: 29px; }
.colorful-section { background: linear-gradient(135deg, #ffffff, #eef2ff 55%, #fdf2f8); }
.button-field { display: flex; align-items: end; }
.batch-question-block { border: 1px solid #c7d2fe; border-radius: 22px; padding: 18px; margin-bottom: 18px; background: linear-gradient(180deg, #ffffff, #f8fbff); box-shadow: 0 12px 28px rgba(79,70,229,.08); display: grid; gap: 13px; }
.batch-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-bottom: 8px; border-bottom: 1px dashed #cbd5e1; }
.batch-head strong { font-size: 22px; color: var(--primary); }
.batch-head span { color: var(--muted); }
.mcq-options-box { border: 1px dashed #86efac; background: #f0fdf4; border-radius: 18px; padding: 14px; }
.board-grid { background: #fff7ed; border: 1px solid #fed7aa; border-radius: 18px; padding: 12px; }
.login-card { background: rgba(255,255,255,.94); }
.admin-card, .detail-card, .stat-card { backdrop-filter: blur(10px); }
@media (max-width: 1150px) {
    .classroom-filter, .manage-filter { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 700px) {
    .classroom-filter, .manage-filter { grid-template-columns: 1fr; }
    .hero-mini, .batch-head { flex-direction: column; align-items: flex-start; }
    .title-text { font-size: 19px; }
}

/* Update: collapsible icon sidebar, full-screen classroom, important marks, flexible answer blocks */
.sidebar-top-toggle { border: 1px solid #c7d2fe; background: #eef2ff; color: #3730a3; border-radius: 999px; padding: 8px 12px; font-weight: 900; cursor: pointer; }
.admin-sidebar a { display: flex; align-items: center; gap: 10px; white-space: nowrap; }
.admin-sidebar .nav-icon { width: 24px; text-align: center; font-size: 18px; flex: 0 0 24px; }
.sidebar-collapsed .admin-shell { grid-template-columns: 74px 1fr; }
.sidebar-collapsed .admin-sidebar { padding: 10px; }
.sidebar-collapsed .admin-sidebar a { justify-content: center; padding: 13px 10px; }
.sidebar-collapsed .admin-sidebar .nav-text { display: none; }
.sidebar-collapsed .admin-sidebar .nav-icon { font-size: 21px; }

.classroom-mode .admin-shell { width: min(100% - 20px, 1680px); grid-template-columns: 74px 1fr; }
.classroom-mode:not(.sidebar-collapsed) .admin-shell { grid-template-columns: 220px 1fr; }
.classroom-mode .admin-content { min-height: calc(100vh - 120px); }
.classroom-topbar { position: sticky; top: 76px; z-index: 35; display: flex; justify-content: space-between; gap: 16px; align-items: center; background: linear-gradient(135deg, rgba(255,255,255,.94), rgba(238,242,255,.94)); border: 1px solid #dbeafe; border-radius: 24px; padding: 16px 18px; margin-bottom: 16px; box-shadow: 0 18px 42px rgba(79,70,229,.12); backdrop-filter: blur(16px); }
.classroom-topbar h1 { margin: 0; }
.classroom-layout { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 18px; align-items: start; }
.class-nav-panel { position: sticky; top: 168px; max-height: calc(100vh - 190px); overflow: auto; border-radius: 24px; border: 1px solid #dbeafe; background: linear-gradient(180deg, #fff, #f8fbff); padding: 14px; box-shadow: 0 18px 38px rgba(30,41,59,.08); }
.class-nav-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; gap: 8px; }
.class-nav-head a, .class-nav-special, .chapter-nav-links a { border: 1px solid #dbeafe; background: #fff; color: #475569; border-radius: 14px; padding: 9px 11px; font-weight: 700; }
.class-nav-special { display: block; margin-bottom: 8px; }
.class-nav-special.active, .chapter-nav-links a:hover, .class-nav-head a:hover { background: linear-gradient(135deg, #eef2ff, #fdf2f8); color: #4338ca; }
.chapter-nav-item { border: 1px solid #e2e8f0; border-radius: 18px; background: #fff; margin: 9px 0; overflow: hidden; }
.chapter-nav-item summary { cursor: pointer; list-style: none; display: grid; grid-template-columns: 28px 1fr auto; gap: 8px; align-items: center; padding: 12px; }
.chapter-nav-item summary::-webkit-details-marker { display: none; }
.chapter-nav-item summary em { font-style: normal; font-weight: 800; color: #4f46e5; background: #eef2ff; border-radius: 999px; padding: 2px 8px; }
.chapter-nav-links { display: grid; gap: 7px; padding: 0 10px 12px 42px; }
.topic-mini-title { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: #64748b; font-weight: 900; margin-top: 4px; }
.topic-link small { float: right; color: #7c3aed; }
.class-main-panel { min-width: 0; }
.classroom-filter { grid-template-columns: minmax(240px,1.4fr) repeat(7,minmax(120px,.8fr)) auto auto !important; }
.summary-main { min-width: 0; }
.question-list-item summary { grid-template-columns: minmax(0,1fr) auto; align-items: center; }
.summary-actions { display: flex; align-items: center; gap: 8px; }
.summary-actions form { margin: 0; }
.star-btn { width: 42px; height: 42px; border-radius: 14px; border: 1px solid #fde68a; background: #fffbeb; color: #b45309; font-size: 25px; line-height: 1; cursor: pointer; box-shadow: 0 8px 18px rgba(245,158,11,.15); }
.star-btn.on { background: linear-gradient(135deg, #f59e0b, #f97316); color: #fff; border-color: #f59e0b; }
.featured-question { border-color: #fbbf24; box-shadow: 0 18px 42px rgba(245,158,11,.16); }
.featured-question summary { background: linear-gradient(135deg, #fffbeb, #fff); }
.ghost-btn.small { padding: 7px 10px; font-size: 13px; }
.answer-flow { display: grid; gap: 14px; }
.answer-flow-image { margin: 0; border: 1px solid #dbeafe; border-radius: 22px; padding: 12px; background: linear-gradient(180deg, #fff, #f8fbff); }
.answer-flow-image img { width: 100%; max-height: 650px; object-fit: contain; border-radius: 16px; background: #f8fafc; }
.answer-flow-image figcaption, .inline-preview figcaption { color: #64748b; font-size: 14px; margin-top: 8px; text-align: center; }
.image-note { margin-top: 10px; }
.answer-block-editor .section-heading.mini { margin: 0 0 6px; }
.answer-block-row { display: grid; grid-template-columns: 92px 150px minmax(240px,1fr) 160px 190px 140px 120px; gap: 10px; align-items: start; border: 1px solid #c7d2fe; border-radius: 20px; background: linear-gradient(180deg, #fff, #f8fbff); padding: 12px; margin-bottom: 12px; }
.answer-block-row.compact { grid-template-columns: 130px minmax(240px,1fr) 180px 160px; }
.answer-block-row label { margin: 0; }
.inline-preview img { width: 170px; height: 110px; object-fit: contain; background: #fff; border: 1px solid #e2e8f0; border-radius: 14px; }
.danger-check { color: #dc2626; font-weight: 800; }
.answer-blocks-mini { border: 1px dashed #a5b4fc; background: #eef2ff; border-radius: 20px; padding: 14px; display: grid; gap: 8px; }
.answer-blocks-mini h3 { margin-bottom: 0; color: #4338ca; }
.important-add { background: #fffbeb; border: 1px solid #fde68a; border-radius: 16px; padding: 12px; font-weight: 800; color: #92400e; }

@media (max-width: 1300px) {
  .classroom-layout { grid-template-columns: 1fr; }
  .class-nav-panel { position: static; max-height: none; }
  .classroom-filter { grid-template-columns: 1fr 1fr !important; }
  .answer-block-row, .answer-block-row.compact { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .sidebar-collapsed .admin-shell, .classroom-mode .admin-shell, .classroom-mode:not(.sidebar-collapsed) .admin-shell { grid-template-columns: 1fr; }
  .admin-sidebar { position: static; display: grid; grid-template-columns: repeat(4, 1fr); }
  .admin-sidebar a { justify-content: center; }
  .admin-sidebar .nav-text { display: none; }
  .classroom-topbar { position: static; flex-direction: column; align-items: flex-start; }
  .classroom-filter, .answer-block-row, .answer-block-row.compact { grid-template-columns: 1fr !important; }
  .question-list-item summary { grid-template-columns: 1fr; }
  .summary-actions { justify-content: flex-start; }
}