:root {
    --bg: #f7f8f4;
    --surface: #ffffff;
    --surface-2: #eef2ea;
    --ink: #18211d;
    --muted: #657269;
    --line: #dce3da;
    --accent: #2f7d5c;
    --accent-ink: #0f3f2c;
    --accent-soft: #dfeee6;
    --danger: #9d3d35;
    --danger-soft: #f6dfdc;
    --amber: #9a6a22;
    --amber-soft: #f4ead8;
    --shadow: 0 20px 55px rgba(24, 33, 29, .08);
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html {
    min-height: 100%;
}

body {
    margin: 0;
    min-height: 100dvh;
    background: var(--bg);
    color: var(--ink);
    font-family: Geist, Satoshi, "Aptos", "Segoe UI", Arial, sans-serif;
    letter-spacing: 0;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image: linear-gradient(rgba(24, 33, 29, .025) 1px, transparent 1px), linear-gradient(90deg, rgba(24, 33, 29, .025) 1px, transparent 1px);
    background-size: 36px 36px;
}

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

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

button,
a,
select,
input,
textarea {
    -webkit-tap-highlight-color: transparent;
}

.site-shell {
    width: min(1240px, calc(100% - 32px));
    margin: 0 auto;
}

.topbar {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 18px;
    align-items: center;
    padding: 18px 0;
}

.brand {
    display: inline-flex;
    gap: 10px;
    align-items: center;
    min-width: 190px;
}

.brand-mark {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--accent-ink);
    font-size: 1.45rem;
    box-shadow: var(--shadow);
}

.brand strong,
.brand small {
    display: block;
}

.brand small {
    margin-top: 2px;
    color: var(--muted);
    font-size: .78rem;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

.nav a {
    border: 1px solid transparent;
    border-radius: var(--radius);
    color: var(--muted);
    padding: 9px 11px;
    transition: transform .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
    background: var(--surface);
    border-color: var(--line);
    color: var(--ink);
}

.nav a:active,
button:active,
.primary-button:active,
.secondary-button:active,
.action-card:active {
    transform: translateY(1px) scale(.99);
}

.topbar-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.locale-form select,
select,
input,
textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--ink);
    padding: 11px 12px;
    outline: none;
    transition: border-color .18s ease, box-shadow .18s ease;
}

input:focus,
select:focus,
textarea:focus {
    border-color: rgba(47, 125, 92, .65);
    box-shadow: 0 0 0 4px rgba(47, 125, 92, .12);
}

textarea {
    resize: vertical;
    min-height: 220px;
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

.main-shell {
    padding: 34px 0 72px;
}

.notice {
    margin-bottom: 18px;
    border: 1px solid rgba(47, 125, 92, .24);
    border-radius: var(--radius);
    background: var(--accent-soft);
    color: var(--accent-ink);
    padding: 13px 15px;
}

.notice-error {
    border-color: rgba(157, 61, 53, .24);
    background: var(--danger-soft);
    color: var(--danger);
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(360px, .85fr);
    gap: 48px;
    align-items: center;
    min-height: calc(100dvh - 160px);
}

.hero-copy {
    max-width: 700px;
}

.eyebrow,
.mini-label {
    margin: 0 0 12px;
    color: var(--accent);
    font-size: .82rem;
    font-weight: 700;
    letter-spacing: 0;
}

h1,
h2 {
    margin: 0;
    line-height: 1;
    letter-spacing: 0;
}

h1 {
    max-width: 780px;
    font-size: 2.65rem;
}

h2 {
    font-size: 1.45rem;
}

@media (min-width: 800px) {
    h1 {
        font-size: 4.25rem;
    }
}

.hero-copy p:not(.eyebrow),
.page-heading p:not(.eyebrow),
.empty-copy {
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.65;
    max-width: 62ch;
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.primary-button,
.secondary-button,
.ghost-button,
.rate-button {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    padding: 11px 16px;
    transition: transform .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
}

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

.secondary-button,
.ghost-button {
    background: var(--surface);
    border-color: var(--line);
    color: var(--ink);
}

.ghost-button {
    min-height: 39px;
    padding: 8px 12px;
}

.primary-button:hover {
    background: var(--accent-ink);
}

.secondary-button:hover,
.ghost-button:hover {
    border-color: rgba(47, 125, 92, .35);
}

.speak-button {
    display: inline-grid;
    width: 32px;
    height: 32px;
    place-items: center;
    margin-left: 8px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface);
    color: var(--accent-ink);
    font-size: .82rem;
    line-height: 1;
    vertical-align: middle;
    cursor: pointer;
}

.speak-button.large {
    width: 38px;
    height: 38px;
    font-size: .9rem;
}

.speak-button:hover {
    border-color: rgba(47, 125, 92, .35);
    background: var(--accent-soft);
}

.study-preview {
    display: grid;
    gap: 14px;
}

.preview-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.preview-card,
.metric-tile,
.panel,
.auth-panel,
.quiz-panel,
.flashcard,
.import-panel,
.admin-form,
.user-card,
.setup-panel {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, .84);
    box-shadow: var(--shadow);
}

.preview-card {
    min-height: 180px;
    padding: 24px;
}

.preview-card.large {
    min-height: 310px;
}

.preview-card strong {
    display: block;
    margin-top: 18px;
    font-size: 4.8rem;
    line-height: 1;
}

.preview-card small {
    display: block;
    margin-top: 14px;
    color: var(--muted);
}

.preview-card.ink {
    background: var(--ink);
    color: white;
}

.preview-card.ink .mini-label,
.preview-card.ink small {
    color: rgba(255, 255, 255, .72);
}

.page-heading {
    margin-bottom: 28px;
}

.page-heading.compact {
    margin-bottom: 20px;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 22px;
}

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

.metric-tile {
    min-height: 138px;
    padding: 18px;
}

.metric-tile span,
.word-meta span,
.detail-list dt {
    color: var(--muted);
    font-size: .86rem;
}

.metric-tile strong {
    display: block;
    margin-top: 18px;
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 2.35rem;
    line-height: 1;
}

.metric-tile.accent {
    background: var(--accent-soft);
    border-color: rgba(47, 125, 92, .22);
}

.split-section {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr);
    gap: 18px;
}

.panel {
    padding: 22px;
}

.level-list {
    display: grid;
    gap: 14px;
    margin-top: 22px;
}

.level-row {
    display: grid;
    grid-template-columns: 74px 1fr 64px;
    gap: 14px;
    align-items: center;
}

.progress-track {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: var(--surface-2);
}

.progress-track span {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--accent);
}

.quick-actions {
    display: grid;
    gap: 12px;
}

.action-card {
    display: grid;
    min-height: 126px;
    grid-template-columns: 1fr auto;
    gap: 16px;
    align-items: center;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 20px;
    transition: transform .18s ease, border-color .18s ease;
}

.action-card:hover {
    border-color: rgba(47, 125, 92, .35);
}

.action-card strong {
    font-size: 3.2rem;
    color: var(--accent-ink);
}

.course-progress-panel {
    margin-top: 18px;
}

.course-progress-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin-top: 18px;
}

.course-progress-card {
    display: grid;
    gap: 10px;
    min-height: 132px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    color: inherit;
    padding: 16px;
    text-decoration: none;
}

.course-progress-card:hover {
    border-color: rgba(47, 125, 92, .35);
}

.course-progress-card span,
.course-progress-card small {
    color: var(--muted);
}

.course-progress-card strong {
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 1.8rem;
    line-height: 1;
}

.data-health-panel {
    display: grid;
    gap: 16px;
    max-width: 980px;
    margin-bottom: 18px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 22px;
}

.data-health-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.data-health-grid article {
    display: grid;
    gap: 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-2);
    padding: 14px;
}

.data-health-grid span,
.data-health-grid small,
.health-course-list span {
    color: var(--muted);
}

.data-health-grid strong {
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: 1.9rem;
    line-height: 1;
}

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

.health-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .94rem;
}

.health-table th,
.health-table td {
    border-top: 1px solid var(--line);
    padding: 10px 8px;
    text-align: left;
}

.health-details summary {
    cursor: pointer;
    color: var(--accent-ink);
}

.health-course-list {
    display: grid;
    gap: 6px;
    margin-top: 12px;
}

.quizlet-coverage-panel {
    margin-top: 18px;
}

.quizlet-coverage-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.quizlet-coverage-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 14px;
    align-items: center;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    padding: 12px;
}

.quizlet-coverage-card.complete {
    border-color: rgba(47, 125, 92, .24);
    background: var(--accent-soft);
}

.quizlet-coverage-card strong,
.quizlet-coverage-card span,
.quizlet-coverage-card small {
    display: block;
}

.quizlet-coverage-card span,
.quizlet-coverage-card small {
    color: var(--muted);
    font-size: .86rem;
}

.quizlet-coverage-card b {
    display: block;
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    text-align: right;
}

.auth-panel,
.import-panel,
.profile-panel,
.admin-form,
.user-card {
    display: grid;
    gap: 24px;
    max-width: 560px;
    padding: 26px;
}

.import-panel.wide {
    max-width: 980px;
    margin-top: 18px;
}

.order-selector {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
}

.order-grid {
    display: grid;
    gap: 18px;
}

.order-table input[type="number"] {
    width: 92px;
    min-width: 92px;
}

.order-table td:nth-child(2) {
    font-size: 1.1rem;
    font-weight: 800;
}

.metadata-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.metadata-wide {
    grid-column: 1 / -1;
}

.line-counter {
    display: inline-grid;
    min-width: 54px;
    min-height: 24px;
    place-items: center;
    margin-left: 8px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-2);
    color: var(--muted);
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
    font-size: .75rem;
}

.line-counter.is-ok {
    border-color: rgba(47, 125, 92, .28);
    background: var(--accent-soft);
    color: var(--accent-ink);
}

.form-stack,
.import-panel,
.profile-panel,
.admin-form,
.user-edit-form,
.filter-bar,
.mode-tabs {
    display: grid;
    gap: 14px;
}

.form-stack label,
.import-panel label,
.profile-panel label,
.metadata-grid label,
.admin-form label,
.user-edit-form label,
.filter-bar label,
.mode-tabs label,
.typed-answer,
.canvas-tools label {
    display: grid;
    gap: 7px;
}

.form-stack label span,
.import-panel label span,
.profile-panel label span,
.metadata-grid label span,
.admin-form label span,
.user-edit-form label span,
.filter-bar label span,
.mode-tabs label span,
.typed-answer span,
.canvas-tools label span {
    color: var(--muted);
    font-size: .88rem;
}

.filter-bar {
    grid-template-columns: minmax(220px, 1fr) 130px minmax(190px, .7fr) minmax(160px, .55fr) 170px auto;
    align-items: end;
    margin-bottom: 18px;
}

.admin-grid {
    display: grid;
    grid-template-columns: minmax(280px, 420px) minmax(0, 1fr);
    gap: 18px;
    align-items: start;
}

.admin-form,
.user-card {
    background: var(--surface);
}

.user-list {
    display: grid;
    gap: 12px;
}

.user-card {
    max-width: none;
    gap: 12px;
}

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

.check-row {
    display: flex !important;
    gap: 10px;
    align-items: center;
}

.check-row input {
    width: auto;
}

.admin-actions {
    display: flex;
    align-items: end;
}

.ghost-button.danger {
    color: var(--danger);
}

.ghost-button:disabled {
    cursor: not-allowed;
    opacity: .45;
}

.word-list {
    display: grid;
    gap: 8px;
}

.word-row {
    display: grid;
    grid-template-columns: minmax(140px, .45fr) minmax(220px, 1fr) 110px;
    gap: 16px;
    align-items: center;
    border-top: 1px solid var(--line);
    padding: 15px 4px;
}

.word-main strong {
    display: block;
    font-size: 1.9rem;
    line-height: 1.1;
}

.word-main a {
    color: inherit;
    text-decoration: none;
}

.word-main a:hover {
    color: var(--accent-ink);
}

.word-main span,
.word-translation small,
.word-meta small {
    color: var(--muted);
}

.word-translation {
    display: grid;
    gap: 4px;
}

.word-meta {
    display: grid;
    gap: 5px;
    justify-items: end;
}

.favorite-form {
    margin-top: 4px;
}

.favorite-button {
    display: grid;
    width: 36px;
    height: 36px;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--muted);
    cursor: pointer;
    font-size: 1.15rem;
}

.favorite-button.active {
    border-color: rgba(47, 125, 92, .35);
    background: var(--accent-soft);
    color: var(--accent-ink);
}

.word-detail-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr);
    gap: 18px;
    align-items: start;
}

.word-hero-panel,
.word-progress-panel,
.word-section {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 24px;
}

.word-hero-main {
    display: grid;
    gap: 10px;
}

.word-hero-main strong {
    font-size: 5rem;
    line-height: 1;
}

.word-hero-main span,
.word-hero-main small {
    color: var(--muted);
}

.word-hero-main p {
    margin: 6px 0 0;
    font-size: 1.45rem;
}

.detail-action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.word-progress-panel {
    display: grid;
    gap: 18px;
}

.word-section {
    margin-top: 18px;
}

.hanzi-chip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 10px;
    margin-top: 14px;
}

.hanzi-chip {
    display: grid;
    gap: 6px;
    min-height: 118px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-2);
    color: inherit;
    padding: 14px;
    text-decoration: none;
}

.hanzi-chip strong {
    font-size: 2.35rem;
    line-height: 1;
}

.hanzi-chip span,
.hanzi-chip small {
    color: var(--muted);
}

.word-nav-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: space-between;
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.history-list {
    display: grid;
    gap: 8px;
    margin-top: 12px;
}

.history-list div {
    border-top: 1px solid var(--line);
    padding-top: 8px;
}

.history-list strong,
.history-list span {
    display: block;
}

.history-list span {
    color: var(--muted);
    font-size: .88rem;
}

.history-page-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 18px;
    align-items: start;
}

.history-panel {
    min-width: 0;
}

.timeline-list {
    display: grid;
    gap: 10px;
    margin-top: 16px;
}

.timeline-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(190px, .55fr);
    gap: 16px;
    align-items: start;
    border-top: 1px solid var(--line);
    padding-top: 12px;
}

.timeline-title {
    display: inline-block;
    color: var(--ink);
    font-size: 1.18rem;
    font-weight: 800;
}

.timeline-item span,
.timeline-item small {
    display: block;
    color: var(--muted);
    font-size: .88rem;
}

.timeline-meta {
    text-align: right;
}

.timeline-meta strong {
    display: block;
    margin-bottom: 4px;
}

.mode-tabs {
    grid-template-columns: repeat(3, minmax(180px, 1fr));
    max-width: 920px;
    margin-bottom: 16px;
}

.flashcard {
    display: grid;
    gap: 18px;
    max-width: 780px;
    min-height: 360px;
    padding: 28px;
}

.flashcard-face,
.flashcard-answer {
    display: grid;
    gap: 16px;
    align-content: center;
}

.flashcard-face strong {
    font-size: 4.4rem;
    line-height: 1;
}

.flashcard-answer strong {
    display: block;
    font-size: 3.2rem;
    line-height: 1;
}

.flashcard-answer p {
    margin: 0;
    font-size: 1.5rem;
}

.flashcard-answer span,
.flashcard-answer small {
    color: var(--muted);
}

.flashcard-examples {
    display: grid;
    gap: 10px;
    max-width: 640px;
    justify-self: center;
    border-top: 1px solid var(--line);
    padding-top: 14px;
    color: var(--muted);
}

.flashcard-examples > span {
    color: var(--ink);
    font-weight: 700;
}

.flashcard-examples p {
    margin: 0;
}

.example-chip-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.flashcard-examples .example-chip-list {
    justify-content: center;
}

.example-chip {
    display: inline-grid;
    gap: 3px;
    max-width: 230px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface);
    padding: 8px 10px;
}

.example-chip strong {
    color: var(--ink);
    font-size: 1.05rem;
    line-height: 1.15;
}

.example-chip small {
    color: var(--muted);
    font-size: .82rem;
    line-height: 1.25;
}

.rating-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    max-width: 780px;
    margin-top: 14px;
}

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

.rate-button {
    background: var(--surface);
    border-color: var(--line);
    color: var(--ink);
}

.rate-button.again {
    background: var(--danger-soft);
    border-color: rgba(157, 61, 53, .24);
    color: var(--danger);
}

.rate-button.hard {
    background: var(--amber-soft);
    border-color: rgba(154, 106, 34, .24);
    color: var(--amber);
}

.rate-button.good,
.rate-button.easy {
    background: var(--accent-soft);
    border-color: rgba(47, 125, 92, .24);
    color: var(--accent-ink);
}

.quiz-panel {
    display: grid;
    gap: 22px;
    max-width: 780px;
    padding: 28px;
}

.quiz-panel > strong {
    font-size: 2.9rem;
    line-height: 1.1;
}

.choice-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.choice-option input {
    position: absolute;
    opacity: 0;
}

.choice-option span {
    display: block;
    min-height: 58px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 16px;
    transition: background .18s ease, border-color .18s ease;
}

.choice-option input:checked + span {
    border-color: rgba(47, 125, 92, .5);
    background: var(--accent-soft);
}

.hanzi-layout {
    display: grid;
    grid-template-columns: minmax(320px, 620px) minmax(280px, 1fr);
    gap: 22px;
    align-items: start;
}

.hanzi-board {
    position: relative;
    aspect-ratio: 1 / 1;
    width: 100%;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background-color: var(--surface);
    background-image:
        linear-gradient(rgba(24, 33, 29, .11) 1px, transparent 1px),
        linear-gradient(90deg, rgba(24, 33, 29, .11) 1px, transparent 1px),
        linear-gradient(45deg, transparent calc(50% - 1px), rgba(47, 125, 92, .16) calc(50% - 1px), rgba(47, 125, 92, .16) calc(50% + 1px), transparent calc(50% + 1px)),
        linear-gradient(-45deg, transparent calc(50% - 1px), rgba(47, 125, 92, .16) calc(50% - 1px), rgba(47, 125, 92, .16) calc(50% + 1px), transparent calc(50% + 1px));
    background-size: 25% 25%, 25% 25%, 100% 100%, 100% 100%;
    box-shadow: var(--shadow);
}

.hanzi-template {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: var(--ink);
    font-family: "Kaiti SC", "STKaiti", "Songti SC", serif;
    font-size: 58vw;
    line-height: 1;
    user-select: none;
    pointer-events: none;
}

@media (min-width: 800px) {
    .hanzi-template {
        font-size: 23rem;
    }
}

.hanzi-board canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    touch-action: none;
}

.hanzi-side {
    display: grid;
    gap: 16px;
}

.hanzi-character {
    font-family: "Kaiti SC", "STKaiti", "Songti SC", serif;
    font-size: 6rem;
    line-height: 1;
}

.stroke-order-hint {
    display: grid;
    gap: 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-2);
    padding: 14px;
}

.stroke-order-hint a {
    color: var(--accent-ink);
}

.stroke-order-hint code {
    white-space: pre-wrap;
    word-break: break-word;
}

.stroke-player-panel {
    display: grid;
    gap: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface-2);
    padding: 14px;
}

.stroke-player {
    display: grid;
    width: min(100%, 240px);
    aspect-ratio: 1;
    place-items: center;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: white;
}

.stroke-player svg {
    display: block;
    max-width: 100%;
    height: auto;
}

.stroke-player-status {
    color: var(--danger);
}

.detail-list {
    display: grid;
    gap: 10px;
    margin: 0;
}

.detail-list div {
    display: grid;
    grid-template-columns: 84px 1fr;
    gap: 12px;
    border-top: 1px solid var(--line);
    padding-top: 10px;
}

.detail-list dd {
    margin: 0;
}

.canvas-tools {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.canvas-tools label {
    grid-column: 1 / -1;
}

input[type="range"] {
    padding: 0;
    accent-color: var(--accent);
}

.examples-list {
    display: grid;
    gap: 8px;
    border-top: 1px solid var(--line);
    padding-top: 14px;
}

.examples-list span {
    color: var(--muted);
}

.empty-state,
.setup-panel {
    display: grid;
    gap: 14px;
    align-items: start;
    max-width: 660px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 28px;
    box-shadow: var(--shadow);
}

.empty-state strong {
    font-size: 1.35rem;
}

code,
pre {
    border-radius: var(--radius);
    background: var(--surface-2);
    color: var(--ink);
    font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

code {
    padding: 2px 5px;
}

pre {
    overflow: auto;
    padding: 14px;
}

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

@media (max-width: 920px) {
    .topbar {
        grid-template-columns: 1fr;
    }

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

    .hero-grid,
    .split-section,
    .word-detail-grid,
    .history-grid,
    .history-page-grid,
    .hanzi-layout {
        grid-template-columns: 1fr;
        min-height: auto;
    }

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

    .filter-bar,
    .mode-tabs,
    .admin-grid,
    .data-health-grid,
    .metadata-grid,
    .quizlet-coverage-list,
    .timeline-item,
    .user-edit-form,
    .word-row {
        grid-template-columns: 1fr;
    }

    .timeline-meta {
        text-align: left;
    }

    .word-meta {
        justify-items: start;
    }
}

@media (max-width: 620px) {
    .site-shell {
        width: min(100% - 24px, 1240px);
    }

    .main-shell {
        padding-top: 20px;
    }

    h1 {
        font-size: 2.25rem;
    }

    .hero-copy p:not(.eyebrow) {
        font-size: 1rem;
    }

    .preview-grid,
    .metric-grid,
    .order-selector,
    .choice-grid,
    .rating-row,
    .rating-row.compact,
    .canvas-tools {
        grid-template-columns: 1fr;
    }

.flashcard,
.quiz-panel,
.auth-panel,
.profile-panel,
.import-panel,
.empty-state {
        padding: 20px;
    }

    .flashcard-face strong {
        font-size: 3rem;
    }

    .quiz-panel > strong {
        font-size: 2.2rem;
    }

    .hanzi-character {
        font-size: 4rem;
    }

    .word-hero-main strong {
        font-size: 3.6rem;
    }
}