:root {
    --bg: #f3f4f6;
    --surface: #ffffff;
    --surface-alt: #111827;
    --text: #0f172a;
    --muted: #64748b;
    --line: #dbe2ea;
    --primary: #0f766e;
    --primary-dark: #115e59;
    --accent: #f59e0b;
    --danger: #b91c1c;
    --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
    --radius: 22px;
    color-scheme: light;
}

[data-theme="dark"] {
    --bg: #0b1220;
    --surface: rgba(17, 24, 39, 0.92);
    --surface-alt: #0b1220;
    --text: #e5e7eb;
    --muted: rgba(226, 232, 240, 0.7);
    --line: rgba(148, 163, 184, 0.22);
    --primary: #14b8a6;
    --primary-dark: #2dd4bf;
    --accent: #fbbf24;
    --danger: #ef4444;
    --shadow: 0 22px 70px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    background:
        radial-gradient(circle at top left, rgba(245, 158, 11, 0.16), transparent 30%),
        linear-gradient(180deg, #f8fafc 0%, #eef2f7 100%);
    color: var(--text);
}

[data-theme="dark"] body {
    background:
        radial-gradient(circle at top left, rgba(245, 158, 11, 0.1), transparent 36%),
        radial-gradient(circle at top right, rgba(20, 184, 166, 0.12), transparent 40%),
        linear-gradient(180deg, #070b14 0%, #0b1220 100%);
}

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

button,
input,
select,
textarea {
    font: inherit;
}

.auth-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 32px 18px;
}

.auth-panel {
    width: min(1120px, 100%);
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 24px;
    align-items: stretch;
}

.auth-copy,
.auth-card,
.sidebar,
.panel-card,
.stat-card,
.flash-success {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(219, 226, 234, 0.9);
    box-shadow: var(--shadow);
    border-radius: var(--radius);
}

[data-theme="dark"] .auth-copy,
[data-theme="dark"] .auth-card,
[data-theme="dark"] .panel-card,
[data-theme="dark"] .stat-card,
[data-theme="dark"] .flash-success {
    background: rgba(17, 24, 39, 0.78);
    border-color: rgba(148, 163, 184, 0.18);
}

.auth-copy {
    padding: 44px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.auth-copy h1,
.topbar h1,
.card-header h2,
.section-head h2 {
    margin: 0;
    line-height: 1.05;
}

.auth-copy h1 {
    font-size: clamp(2.6rem, 4vw, 4.6rem);
    max-width: 10ch;
}

.auth-lead,
.panel-copy {
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.7;
}

.auth-points {
    margin: 24px 0 0;
    padding-left: 20px;
    color: var(--text);
}

.auth-card {
    padding: 32px;
}

.card-header {
    margin-bottom: 22px;
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--primary);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.auth-form,
.auth-form label {
    display: grid;
    gap: 10px;
}

.auth-form {
    gap: 18px;
}

.form-note {
    margin: 18px 0 0;
    color: var(--muted);
}

.form-note a {
    color: var(--primary-dark);
    font-weight: 700;
}

input[type="email"],
input[type="password"],
input[type="text"],
select,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    background: #fff;
    padding: 14px 16px;
    border-radius: 16px;
    outline: none;
}

[data-theme="dark"] input[type="email"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="datetime-local"],
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: rgba(2, 6, 23, 0.42);
    color: var(--text);
    border-color: rgba(148, 163, 184, 0.24);
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
    color: rgba(226, 232, 240, 0.55);
}

input:focus,
select:focus,
textarea:focus {
    border-color: rgba(15, 118, 110, 0.7);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.1);
}

textarea {
    resize: vertical;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
}

.primary-button,
.ghost-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: 0;
    border-radius: 999px;
    padding: 13px 18px;
    cursor: pointer;
    transition: transform 0.2s ease, background 0.2s ease;
}

.compact-button {
    padding: 9px 14px;
    font-size: 0.92rem;
}

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

.ghost-button {
    background: #fff;
    color: var(--text);
    border: 1px solid var(--line);
}

[data-theme="dark"] .ghost-button {
    background: rgba(2, 6, 23, 0.24);
    border-color: rgba(148, 163, 184, 0.22);
}

[data-theme="dark"] .user-pill {
    background: rgba(2, 6, 23, 0.22);
    border-color: rgba(148, 163, 184, 0.22);
}

[data-theme="dark"] table {
    color: var(--text);
}

.primary-button:hover,
.ghost-button:hover {
    transform: translateY(-1px);
}

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

.admin-shell {
    min-height: 100vh;
}

.admin-frame {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 280px 1fr;
}

.sidebar {
    margin: 20px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: linear-gradient(180deg, rgba(17, 24, 39, 0.98) 0%, rgba(15, 23, 42, 0.98) 100%);
    color: #f8fafc;
}

.brand {
    display: flex;
    gap: 14px;
    align-items: center;
    margin-bottom: 34px;
}

.brand-mark {
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--accent), #fb7185);
    color: #111827;
    font-weight: 700;
}

.brand strong,
.user-pill strong {
    display: block;
}

.brand span,
.sidebar-footer small {
    color: rgba(248, 250, 252, 0.66);
}

.sidebar-nav {
    display: grid;
    gap: 10px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 13px 16px;
    border-radius: 14px;
    color: #e2e8f0;
}

.sidebar-nav a.active,
.sidebar-nav a:hover {
    background: rgba(255, 255, 255, 0.08);
}

.disabled-link {
    opacity: 0.55;
    pointer-events: none;
}

.content-area {
    padding: 28px 28px 42px 8px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: center;
    margin-bottom: 24px;
}

.topbar > div:first-child {
    display: grid;
    gap: 10px;
}

.sidebar-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(2px);
    border: 0;
    padding: 0;
    cursor: pointer;
    z-index: 40;
}

.topbar h1 {
    font-size: clamp(2rem, 3vw, 3rem);
}

.topbar-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.user-pill {
    background: rgba(255, 255, 255, 0.9);
    padding: 10px 16px;
    border-radius: 999px;
    border: 1px solid var(--line);
}

.flash-success {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    margin-bottom: 20px;
}

.flash-success button {
    border: 0;
    background: transparent;
    cursor: pointer;
    font-size: 1.2rem;
}

.stats-grid,
.panel-grid,
.toolbar-grid,
.form-grid,
.detail-grid {
    display: grid;
    gap: 18px;
}

.stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: 18px;
}

.stat-card,
.panel-card {
    padding: 22px;
}

.stat-card span {
    color: var(--muted);
    display: block;
    margin-bottom: 12px;
}

.stat-card strong {
    font-size: 2.1rem;
}

.panel-grid {
    grid-template-columns: 1fr 1.4fr;
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.link-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.toolbar-grid {
    grid-template-columns: 2fr 1fr 1fr auto;
    margin-bottom: 18px;
}

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

.form-grid-span {
    grid-column: 1 / -1;
}

.admin-form label,
.detail-grid div {
    display: grid;
    gap: 8px;
}

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

.detail-grid span {
    color: var(--muted);
}

.checkbox-stack {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 18px;
}

.form-actions {
    margin-top: 20px;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    text-align: left;
    padding: 14px 10px;
    vertical-align: middle;
    border-bottom: 1px solid var(--line);
}

th {
    color: var(--muted);
    font-weight: 600;
}

.table-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.action-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    font-weight: 600;
    white-space: nowrap;
}

.action-button {
    border: 0;
    background: transparent;
    cursor: pointer;
    padding: 0;
}

.badge {
    display: inline-flex;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.12);
    color: var(--primary-dark);
}

.badge.muted {
    background: rgba(148, 163, 184, 0.18);
    color: #475569;
}

.pagination-wrap {
    margin-top: 18px;
}

.empty-cell {
    text-align: center;
    color: var(--muted);
}

.media-stats {
    margin-bottom: 20px;
}

.media-toolbar {
    margin-bottom: 22px;
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.media-card {
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
}

[data-theme="dark"] .media-card {
    background: rgba(2, 6, 23, 0.22);
    border-color: rgba(148, 163, 184, 0.22);
}

.media-preview {
    position: relative;
    min-height: 200px;
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.14), rgba(251, 113, 133, 0.14));
}

.media-preview img,
.media-show-preview img,
.course-cover img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.media-placeholder {
    min-height: 200px;
    display: grid;
    place-items: center;
    color: var(--primary-dark);
    font-size: 2rem;
}

.media-placeholder.large {
    min-height: 340px;
}

.media-badges {
    position: absolute;
    top: 14px;
    left: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.media-body {
    padding: 18px;
    display: grid;
    gap: 14px;
}

.media-body h3 {
    margin: 0;
    font-size: 1.35rem;
}

.media-collection {
    margin: 0 0 8px;
    color: var(--muted);
    font-size: 0.92rem;
}

.media-link {
    margin: 0;
    color: var(--muted);
    word-break: break-all;
    line-height: 1.6;
}

.media-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    color: var(--muted);
    font-size: 0.92rem;
}

.feature-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(245, 158, 11, 0.12);
    color: #b45309;
}

.media-empty {
    padding: 48px 24px;
    border: 1px dashed var(--line);
    border-radius: 20px;
    text-align: center;
    color: var(--muted);
}

.media-empty i {
    font-size: 2rem;
    color: var(--primary-dark);
}

.media-show-grid {
    align-items: start;
}

.media-show-preview {
    overflow: hidden;
    border-radius: 18px;
    border: 1px solid var(--line);
    margin-bottom: 18px;
}

[data-theme="dark"] .media-show-preview {
    border-color: rgba(148, 163, 184, 0.22);
    background: rgba(2, 6, 23, 0.22);
}

.media-feature-toggle {
    margin-top: 18px;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 22px;
}

.course-grid--compact {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.course-card {
    overflow: hidden;
    border: 1px solid rgba(219, 226, 234, 0.95);
    border-radius: 26px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 250, 252, 0.96));
    box-shadow: 0 22px 42px rgba(15, 23, 42, 0.08);
    display: grid;
    transition: transform 0.22s ease, box-shadow 0.22s ease;
}

[data-theme="dark"] .course-card {
    border-color: rgba(148, 163, 184, 0.22);
    background: linear-gradient(180deg, rgba(2, 6, 23, 0.22), rgba(15, 23, 42, 0.42));
    box-shadow: 0 22px 62px rgba(0, 0, 0, 0.35);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 28px 52px rgba(15, 23, 42, 0.12);
}

.course-card--compact {
    border-radius: 20px;
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.07);
}

.course-cover {
    position: relative;
    aspect-ratio: 16 / 9;
    min-height: 0;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.14), rgba(251, 113, 133, 0.14));
}

.course-card--compact .course-cover {
    aspect-ratio: 16 / 8.5;
}

.course-cover__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.02) 0%, rgba(15, 23, 42, 0.58) 100%);
    pointer-events: none;
}

.media-badges--floating {
    z-index: 1;
}

.course-cover__footer {
    position: absolute;
    left: 18px;
    right: 18px;
    bottom: 16px;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    color: #f8fafc;
    font-size: 0.9rem;
}

.course-card--compact .course-cover__footer {
    left: 12px;
    right: 12px;
    bottom: 10px;
    gap: 8px;
    font-size: 0.78rem;
}

.course-cover__footer span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.34);
    backdrop-filter: blur(10px);
}

.course-card--compact .course-cover__footer span {
    padding: 6px 10px;
}

.course-subtitle {
    margin: 10px 0 0;
    color: var(--muted);
    line-height: 1.6;
    min-height: 3.2em;
}

.course-card--compact .media-body {
    padding: 14px;
    gap: 10px;
}

.course-card--compact .media-body h3 {
    font-size: 1.05rem;
    line-height: 1.3;
}

.course-card--compact .course-subtitle {
    margin-top: 6px;
    min-height: auto;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 0.92rem;
    line-height: 1.45;
}

.course-meta-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    color: var(--muted);
    font-size: 0.95rem;
}

.course-meta-grid span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.course-meta-grid--compact {
    grid-template-columns: 1fr;
    gap: 8px;
    font-size: 0.88rem;
}

.course-card__actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 4px;
    border-top: 1px solid rgba(219, 226, 234, 0.9);
}

.course-card--compact .course-card__actions {
    gap: 10px;
    padding-top: 10px;
}

.catalog-hero {
    margin-bottom: 22px;
    padding: 22px 24px;
    border-radius: 24px;
    color: #f8fafc;
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 18px;
}

.catalog-hero--compact {
    padding: 14px 16px;
    border-radius: 18px;
    margin-bottom: 16px;
}

.catalog-hero h3 {
    margin: 0;
    max-width: 18ch;
    font-size: clamp(1.4rem, 2vw, 2rem);
    line-height: 1.12;
}

.catalog-hero--compact h3 {
    font-size: 1.05rem;
    max-width: none;
}

.catalog-hero .eyebrow {
    color: rgba(248, 250, 252, 0.72);
}

.catalog-hero--admin {
    background: linear-gradient(135deg, #0f172a 0%, #134e4a 48%, #0f766e 100%);
}

.catalog-hero--student {
    background: linear-gradient(135deg, #1d4ed8 0%, #0f766e 55%, #f59e0b 100%);
}

.catalog-hero--learning {
    background: linear-gradient(135deg, #111827 0%, #b45309 45%, #f59e0b 100%);
}

.catalog-hero__stats {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
}

.catalog-hero__stats span,
.badge-success {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.catalog-hero__stats span {
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    backdrop-filter: blur(10px);
}

.catalog-hero--compact .catalog-hero__stats span {
    padding: 7px 11px;
    font-size: 0.86rem;
}

.badge-success {
    background: rgba(22, 163, 74, 0.15);
    color: #166534;
}

.course-tags {
    gap: 8px;
}

.media-show-preview--course {
    aspect-ratio: 16 / 9;
    min-height: 0;
}

.course-preview-stats {
    margin-bottom: 18px;
}

.curriculum-grid {
    align-items: start;
}

.curriculum-board {
    display: grid;
    gap: 18px;
}

.curriculum-board--compact {
    gap: 12px;
}

.section-card,
.lesson-card {
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
}

[data-theme="dark"] .section-card,
[data-theme="dark"] .lesson-card {
    background: rgba(2, 6, 23, 0.22);
    border-color: rgba(148, 163, 184, 0.22);
}

.section-card {
    padding: 22px;
}

.lesson-card {
    padding: 18px;
}

.curriculum-board--compact .section-card {
    padding: 16px;
    border-radius: 18px;
}

.curriculum-board--compact .lesson-card {
    padding: 14px;
    border-radius: 16px;
}

.curriculum-board--compact .lesson-stack {
    gap: 10px;
    margin: 14px 0;
}

.curriculum-board--compact .panel-copy {
    margin: 10px 0 0;
    font-size: 0.96rem;
    line-height: 1.6;
}

.curriculum-board--compact .section-inline-form,
.curriculum-board--compact .lesson-inline-form,
.curriculum-board--compact .lesson-create-form {
    margin-top: 12px;
}

.curriculum-board--compact .form-grid {
    gap: 12px;
}

.curriculum-board--compact input[type="email"],
.curriculum-board--compact input[type="password"],
.curriculum-board--compact input[type="text"],
.curriculum-board--compact input[type="datetime-local"],
.curriculum-board--compact select,
.curriculum-board--compact textarea {
    padding: 10px 12px;
    border-radius: 14px;
}

.curriculum-board--compact textarea {
    min-height: 96px;
}

.curriculum-board--compact .table-actions {
    gap: 10px;
}

.curriculum-board--compact .ghost-button,
.curriculum-board--compact .primary-button {
    padding: 10px 14px;
    font-size: 0.95rem;
}

.curriculum-board--compact .drag-handle {
    padding-top: 2px;
}

.section-card__header,
.lesson-card__header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 16px;
}

.section-card__header h3,
.lesson-card__header h4 {
    margin: 0;
}

.drag-handle {
    color: var(--muted);
    cursor: grab;
    padding-top: 4px;
}

.lesson-stack {
    display: grid;
    gap: 14px;
    margin: 18px 0;
}

.section-inline-form,
.lesson-inline-form,
.lesson-create-form {
    margin-top: 16px;
}

.curriculum-delete-form {
    margin-top: 12px;
}

.curriculum-actions {
    justify-content: space-between;
}

.media-empty.compact {
    padding: 18px;
}

[data-section-item].dragging,
[data-lesson-item].dragging {
    opacity: 0.45;
}

.player-shell {
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 18px;
}

.player-sidebar,
.player-content {
    min-height: 100%;
}

.progress-panel {
    margin-bottom: 18px;
}

.progress-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.progress-bar {
    height: 12px;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.18);
    overflow: hidden;
}

.progress-bar span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--primary), #fb7185);
}

.player-sections {
    display: grid;
    gap: 18px;
}

.player-section h3 {
    margin: 0 0 12px;
}

.player-lessons {
    display: grid;
    gap: 10px;
}

.player-lesson {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
}

[data-theme="dark"] .player-lesson {
    background: rgba(2, 6, 23, 0.22);
    border-color: rgba(148, 163, 184, 0.22);
}

.player-lesson.active {
    border-color: rgba(15, 118, 110, 0.35);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

.player-lesson__content strong,
.player-lesson__content small {
    display: block;
}

.player-lesson__content small {
    margin-top: 4px;
    color: var(--muted);
}

.player-lesson__status {
    color: var(--primary-dark);
}

.lesson-hero {
    margin-bottom: 18px;
}

.lesson-media-placeholder,
.lesson-resource {
    min-height: 220px;
    display: grid;
    place-items: center;
    text-align: center;
    padding: 24px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.12), rgba(251, 113, 133, 0.12));
}

.lesson-media-placeholder i {
    font-size: 2.2rem;
    color: var(--primary-dark);
}

.lesson-reading {
    margin-bottom: 18px;
}

.learning-actions {
    align-items: center;
}

.quiz-options-list {
    display: grid;
    gap: 12px;
    margin-top: 16px;
}

.quiz-import-strip {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 18px;
    padding: 14px;
    border: 1px dashed var(--line);
    border-radius: 18px;
    background: rgba(248, 250, 252, 0.9);
}

[data-theme="dark"] .quiz-import-strip {
    background: rgba(2, 6, 23, 0.18);
    border-color: rgba(148, 163, 184, 0.22);
}

.quiz-import-form {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.quiz-import-form input[type="file"] {
    max-width: 260px;
    padding: 10px 12px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: #fff;
}

[data-theme="dark"] .quiz-import-form input[type="file"] {
    background: rgba(2, 6, 23, 0.22);
    border-color: rgba(148, 163, 184, 0.24);
    color: var(--text);
}

.quiz-option {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
    cursor: pointer;
    transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
}

[data-theme="dark"] .quiz-option {
    background: rgba(2, 6, 23, 0.22);
    border-color: rgba(148, 163, 184, 0.22);
}

.quiz-option:hover {
    border-color: rgba(15, 118, 110, 0.32);
    box-shadow: 0 10px 22px rgba(15, 23, 42, 0.08);
    transform: translateY(-1px);
}

.quiz-option input[type="radio"] {
    flex: 0 0 auto;
    margin-top: 3px;
    accent-color: var(--primary);
}

.quiz-option__text {
    display: block;
    line-height: 1.55;
}

.quiz-option input[type="radio"]:checked + .quiz-option__text {
    font-weight: 700;
}

.quiz-option:has(input[type="radio"]:checked) {
    border-color: rgba(15, 118, 110, 0.55);
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.1);
    background: linear-gradient(135deg, rgba(240, 253, 250, 0.9), rgba(255, 255, 255, 0.98));
}

[data-theme="dark"] .quiz-option:has(input[type="radio"]:checked) {
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.12), rgba(2, 6, 23, 0.18));
}

.tone-soft {
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), rgba(245, 158, 11, 0.08));
}

.review-stack {
    display: grid;
    gap: 16px;
}

.review-card {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}

[data-theme="dark"] .review-card {
    background: rgba(2, 6, 23, 0.22);
    border-color: rgba(148, 163, 184, 0.22);
}

.review-card p {
    margin: 10px 0 0;
    color: var(--muted);
    line-height: 1.7;
}

.review-card__header {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
}

.review-card__header p {
    margin: 6px 0 0;
}

.quiz-timer-card {
    --timer-progress: 1;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 18px;
    align-items: center;
    padding: 18px;
    border-radius: 22px;
    border: 1px solid rgba(15, 118, 110, 0.16);
    background:
        radial-gradient(circle at top left, rgba(15, 118, 110, 0.18), transparent 42%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(240, 253, 250, 0.96));
}

[data-theme="dark"] .quiz-timer-card {
    border-color: rgba(45, 212, 191, 0.22);
    background:
        radial-gradient(circle at top left, rgba(20, 184, 166, 0.18), transparent 42%),
        linear-gradient(135deg, rgba(2, 6, 23, 0.28), rgba(17, 24, 39, 0.72));
}

.quiz-timer-card.is-warning {
    border-color: rgba(217, 119, 6, 0.28);
    background:
        radial-gradient(circle at top left, rgba(245, 158, 11, 0.22), transparent 42%),
        linear-gradient(135deg, rgba(255, 251, 235, 0.98), rgba(255, 255, 255, 0.96));
}

[data-theme="dark"] .quiz-timer-card.is-warning {
    border-color: rgba(251, 191, 36, 0.22);
    background:
        radial-gradient(circle at top left, rgba(245, 158, 11, 0.18), transparent 42%),
        linear-gradient(135deg, rgba(2, 6, 23, 0.28), rgba(17, 24, 39, 0.72));
}

.quiz-timer-card.is-danger {
    border-color: rgba(220, 38, 38, 0.28);
    background:
        radial-gradient(circle at top left, rgba(248, 113, 113, 0.24), transparent 42%),
        linear-gradient(135deg, rgba(254, 242, 242, 0.98), rgba(255, 255, 255, 0.96));
    animation: quizPulse 1.2s ease-in-out infinite;
}

[data-theme="dark"] .quiz-timer-card.is-danger {
    border-color: rgba(248, 113, 113, 0.26);
    background:
        radial-gradient(circle at top left, rgba(239, 68, 68, 0.18), transparent 42%),
        linear-gradient(135deg, rgba(2, 6, 23, 0.28), rgba(17, 24, 39, 0.72));
}

.quiz-timer-card__ring {
    width: 112px;
    aspect-ratio: 1;
    border-radius: 50%;
    display: grid;
    place-items: center;
    text-align: center;
    background:
        radial-gradient(closest-side, #fff 78%, transparent 80% 100%),
        conic-gradient(var(--primary) calc(var(--timer-progress) * 1turn), rgba(148, 163, 184, 0.18) 0);
    box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.14);
}

[data-theme="dark"] .quiz-timer-card__ring {
    background:
        radial-gradient(closest-side, rgba(2, 6, 23, 0.92) 78%, transparent 80% 100%),
        conic-gradient(var(--primary) calc(var(--timer-progress) * 1turn), rgba(148, 163, 184, 0.22) 0);
    box-shadow:
        inset 0 0 0 1px rgba(148, 163, 184, 0.18),
        0 12px 28px rgba(0, 0, 0, 0.25);
}

.quiz-timer-card.is-warning .quiz-timer-card__ring {
    background:
        radial-gradient(closest-side, #fff 78%, transparent 80% 100%),
        conic-gradient(#d97706 calc(var(--timer-progress) * 1turn), rgba(148, 163, 184, 0.18) 0);
}

[data-theme="dark"] .quiz-timer-card.is-warning .quiz-timer-card__ring {
    background:
        radial-gradient(closest-side, rgba(2, 6, 23, 0.92) 78%, transparent 80% 100%),
        conic-gradient(#fbbf24 calc(var(--timer-progress) * 1turn), rgba(148, 163, 184, 0.22) 0);
}

.quiz-timer-card.is-danger .quiz-timer-card__ring {
    background:
        radial-gradient(closest-side, #fff 78%, transparent 80% 100%),
        conic-gradient(#dc2626 calc(var(--timer-progress) * 1turn), rgba(148, 163, 184, 0.18) 0);
}

.quiz-timer-card__ring strong {
    display: block;
    font-size: 1.35rem;
    font-variant-numeric: tabular-nums;
}

.quiz-timer-card__ring span {
    display: block;
    font-size: 0.50rem;
    color: var(--muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.quiz-timer-card__content p,
.quiz-timer-card__content small {
    margin: 0;
}

.quiz-timer-card__content {
    display: grid;
    gap: 10px;
}

[data-theme="dark"] .quiz-timer-card.is-danger .quiz-timer-card__ring {
    background:
        radial-gradient(closest-side, rgba(2, 6, 23, 0.92) 78%, transparent 80% 100%),
        conic-gradient(#f87171 calc(var(--timer-progress) * 1turn), rgba(148, 163, 184, 0.22) 0);
}

.quiz-timer-chip {
    width: fit-content;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.12);
    color: var(--primary-dark);
    font-size: 0.82rem;
    font-weight: 700;
}

[data-theme="dark"] .quiz-timer-chip {
    background: rgba(20, 184, 166, 0.14);
    color: rgba(226, 232, 240, 0.92);
}

.quiz-submit-banner,
.quiz-attempt-note {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding: 16px 18px;
    margin-bottom: 18px;
    border-radius: 18px;
    border: 1px solid rgba(15, 118, 110, 0.14);
    background: linear-gradient(135deg, rgba(240, 253, 250, 0.96), rgba(255, 255, 255, 0.94));
}

[data-theme="dark"] .quiz-submit-banner,
[data-theme="dark"] .quiz-attempt-note {
    border-color: rgba(45, 212, 191, 0.18);
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.12), rgba(2, 6, 23, 0.22));
}

.quiz-submit-banner h3,
.quiz-submit-banner p,
.quiz-attempt-note p {
    margin: 0;
}

.quiz-attempt-note {
    justify-content: flex-start;
    align-items: flex-start;
    margin-top: 18px;
}

.quiz-attempt-note i {
    font-size: 1.1rem;
    color: #d97706;
    margin-top: 2px;
}

@keyframes quizPulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(248, 113, 113, 0.12);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(248, 113, 113, 0);
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 980px) {
    .auth-panel,
    .panel-grid,
    .stats-grid,
    .media-grid,
    .course-grid,
    .player-shell,
    .toolbar-grid,
    .form-grid,
    .detail-grid,
    .checkbox-stack {
        grid-template-columns: 1fr;
    }

    .admin-frame {
        grid-template-columns: 1fr;
    }

    .content-area {
        padding: 20px 18px 34px;
    }

    .topbar,
    .section-head,
    .catalog-hero,
    .quiz-import-strip,
    .quiz-timer-card,
    .quiz-submit-banner,
    .quiz-attempt-note {
        flex-direction: column;
        align-items: flex-start;
    }

    .catalog-hero__stats,
    .course-card__actions {
        justify-content: flex-start;
    }

    .quiz-timer-card {
        grid-template-columns: 1fr;
    }

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

    .sidebar {
        position: fixed;
        top: 14px;
        bottom: 14px;
        left: 14px;
        right: auto;
        width: min(320px, calc(100vw - 28px));
        margin: 0;
        transform: translateX(calc(-100% - 18px));
        transition: transform 0.22s ease;
        z-index: 50;
        overflow-y: auto;
        overscroll-behavior: contain;
    }

    body.sidebar-open .sidebar {
        transform: translateX(0);
    }

    body.sidebar-open .sidebar-overlay {
        display: block;
    }

    .topbar-actions {
        width: 100%;
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    .user-pill {
        width: 100%;
        border-radius: 18px;
    }
}

@media (max-width: 520px) {
    .stat-card strong {
        font-size: 1.75rem;
    }

    th,
    td {
        padding: 12px 8px;
    }
}