/* Same design tokens as the full app (src/app/globals.css). */
:root {
  --bg: #f5f4ef; --surface: #ffffff; --surface-2: #efede6; --ink: #12161c; --ink-2: #3b434e; --muted: #646d78;
  --line: #dedbd1; --line-strong: #c7c3b6; --accent: #2346d9; --accent-ink: #ffffff; --accent-soft: #e6ebff;
  --pad: #e8590c; --pad-soft: #fff0e6; --ok: #1f7a4d; --ok-soft: #e3f4ea; --warn: #9a6200; --warn-soft: #fdf1d8;
  --info: #1f5f99; --info-soft: #e2eef9; --violet: #6a3fb5; --violet-soft: #efe8fb; --danger: #b42318; --danger-soft: #fdeaea;
  --shadow: 0 1px 2px rgb(18 22 28 / 0.06), 0 1px 1px rgb(18 22 28 / 0.04);
  --radius-card: 14px; --radius-control: 10px;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116; --surface: #161a21; --surface-2: #1d222b; --ink: #eef0f3; --ink-2: #c5cad2; --muted: #949ca8;
    --line: #2a313c; --line-strong: #3a4250; --accent: #7d95ff; --accent-ink: #0b0e14; --accent-soft: #1e2748;
    --pad: #ff8a4c; --pad-soft: #3a2316; --ok: #5cc98f; --ok-soft: #13291e; --warn: #f0b44c; --warn-soft: #2e2412;
    --info: #79b4ea; --info-soft: #142536; --violet: #b79bf0; --violet-soft: #251c38; --danger: #ff8278; --danger-soft: #3a1714;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.4);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); font-size: 15px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }
.container { max-width: 72rem; margin: 0 auto; padding-inline: 16px; }
@media (min-width: 640px) { .container { padding-inline: 24px; } }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 6px 10px; border-radius: 6px; z-index: 50; }
.skip:focus { left: 16px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.xs { font-size: 12px; }

.demo-banner { background: var(--pad-soft); color: var(--ink-2); border-bottom: 1px solid var(--line); font-size: 13px; padding: 8px 16px; text-align: center; }
.site-header { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.header-row { display: flex; align-items: center; gap: 20px; min-height: 56px; flex-wrap: wrap; }
.wordmark { display: flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 600; font-size: 17px; letter-spacing: -0.01em; }
.wordmark:hover { text-decoration: none; }
.wordmark svg { width: 28px; height: 28px; }
.primary-nav { display: flex; gap: 2px; overflow-x: auto; flex: 1; min-width: 0; }
.primary-nav a { color: var(--muted); font-size: 14px; font-weight: 500; padding: 8px 12px; border-radius: var(--radius-control); white-space: nowrap; }
.primary-nav a:hover { color: var(--ink); text-decoration: none; }
.primary-nav a[aria-current="page"] { background: var(--surface-2); color: var(--ink); }
@media (max-width: 560px) { .header-row { padding-block: 6px; gap: 6px; } .primary-nav { flex-basis: 100%; } }
.site-footer { margin-top: 64px; border-top: 1px solid var(--line); padding-block: 28px; color: var(--muted); font-size: 14px; }
.footer-row { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.footer-row p { margin: 0; }

.page-header { border-bottom: 1px solid var(--line); padding-block: 36px 24px; display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: flex-end; }
.eyebrow { margin: 0 0 8px; font-size: 12px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--pad); }
h1 { margin: 0; font-size: clamp(24px, 3.2vw, 32px); font-weight: 600; letter-spacing: -0.015em; text-wrap: balance; }
.lede { margin: 8px 0 0; color: var(--muted); max-width: 42rem; }
h2 { font-size: 16px; font-weight: 600; margin: 0 0 12px; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-card); box-shadow: var(--shadow); }
.pad { padding: 16px; }
.grid { display: grid; gap: 12px; list-style: none; margin: 0; padding: 0; }
@media (min-width: 640px) { .grid.cols { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .grid.cols { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.entry-card { position: relative; display: flex; flex-direction: column; gap: 10px; height: 100%; padding: 16px; }
.entry-card:hover { border-color: var(--line-strong); }
.entry-card h3 { margin: 0; font-size: 16px; line-height: 1.3; }
.entry-card h3 a { color: var(--ink); }
.entry-card h3 a::after { content: ""; position: absolute; inset: 0; }
.entry-card .summary { margin: 0; color: var(--ink-2); font-size: 14px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.row { display: flex; gap: 12px; align-items: flex-start; }
.wrap { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.push { margin-top: auto; }
.min0 { min-width: 0; flex: 1; }

.badge { display: inline-flex; align-items: center; gap: 4px; border-radius: 999px; padding: 2px 8px; font-size: 12px; font-weight: 500; background: var(--surface-2); color: var(--ink-2); }
.badge .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.t-ok { background: var(--ok-soft); color: var(--ok); } .t-warn { background: var(--warn-soft); color: var(--warn); }
.t-info { background: var(--info-soft); color: var(--info); } .t-violet { background: var(--violet-soft); color: var(--violet); }
.t-danger { background: var(--danger-soft); color: var(--danger); } .t-accent { background: var(--accent-soft); color: var(--accent); }
.t-pad { background: var(--pad-soft); color: var(--pad); }

.search { display: grid; gap: 8px; margin-top: 24px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 760px) { .search { grid-template-columns: minmax(0, 1fr) auto auto auto; } }
input[type="search"], select, textarea, input[type="text"] {
  font: inherit; font-size: 15px; color: var(--ink); background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius-control); padding: 0 12px; height: 42px; width: 100%;
}
textarea { height: auto; padding: 10px 12px; line-height: 1.55; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent); }
.btn { font: inherit; font-size: 14px; font-weight: 500; border-radius: var(--radius-control); height: 36px; padding: 0 12px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); cursor: pointer; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn.primary:hover { opacity: 0.9; }
.btn.ghost { border-color: transparent; background: transparent; color: var(--ink-2); }
.btn[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { font-size: 12px; background: var(--surface-2); color: var(--ink-2); border: 0; border-radius: 999px; padding: 4px 10px; cursor: pointer; font-family: inherit; }
.chip:hover { background: var(--line); }

.empty { border: 1px dashed var(--line-strong); border-radius: var(--radius-card); padding: 40px 24px; text-align: center; }
.empty p { margin: 4px 0; }

.hero { background: var(--surface); border-bottom: 1px solid var(--line); }
.hero .container { display: flex; flex-direction: column; gap: 22px; padding-block: 44px; }
.hero h1 { font-size: clamp(28px, 4.2vw, 42px); line-height: 1.12; max-width: 48rem; }
.hero form { display: flex; gap: 8px; max-width: 36rem; }
.hero input { height: 48px; }
.hero .btn.primary { height: 48px; padding: 0 20px; font-size: 15px; }
.stats { display: flex; flex-wrap: wrap; gap: 12px 32px; margin: 0; }
.stats dt { color: var(--muted); font-size: 14px; }
.stats dd { margin: 0; font-size: 22px; font-weight: 600; font-variant-numeric: tabular-nums; }

.two-col { display: grid; gap: 32px; margin-top: 24px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1024px) { .two-col { grid-template-columns: minmax(0, 1fr) 20rem; } }
.stack { display: flex; flex-direction: column; gap: 28px; min-width: 0; }
.claim { padding: 16px; }
.claim p { margin: 0; }
details summary { cursor: pointer; color: var(--accent); font-size: 14px; margin-top: 8px; list-style: none; }
details summary::-webkit-details-marker { display: none; }
.excerpt { border-left: 2px solid var(--line-strong); padding-left: 12px; margin-top: 8px; font-size: 14px; }
.excerpt q { font-style: italic; color: var(--ink-2); }
.sources { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; font-size: 14px; }
.sources li { display: flex; gap: 10px; }
.num { font-family: var(--mono); color: var(--muted); min-width: 1.8rem; text-align: right; }
.side-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.tile { display: block; border: 1px solid var(--line); border-radius: var(--radius-control); background: var(--surface); padding: 8px 12px; color: var(--ink); }
.tile:hover { border-color: var(--line-strong); text-decoration: none; }
.breadcrumb { padding-top: 24px; font-size: 14px; color: var(--muted); }
.breadcrumb a { color: var(--muted); }
.entry-head { display: flex; flex-wrap: wrap; gap: 20px; justify-content: space-between; border-bottom: 1px solid var(--line); padding-block: 12px 24px; }
.big-summary { font-size: 18px; line-height: 1.6; margin: 0; }
.notice { border-radius: var(--radius-control); padding: 12px 16px; font-size: 14px; border: 1px solid var(--line); }
.notice b { display: block; }
.notice.warn { background: var(--warn-soft); } .notice.info { background: var(--info-soft); }
.answer p { margin: 0 0 10px; white-space: pre-line; }
sup a { font-weight: 600; font-size: 12px; }
.history a { display: block; padding: 8px 12px; border-radius: var(--radius-control); color: var(--ink); font-size: 14px; }
.history a:hover { background: var(--surface-2); text-decoration: none; }
.history a[aria-current="true"] { background: var(--surface-2); }
.pager { display: flex; justify-content: space-between; align-items: center; margin-top: 24px; font-size: 14px; }

.anim-loading { aspect-ratio: 16 / 9; display: grid; place-items: center; border: 1px dashed var(--line-strong); border-radius: var(--radius-card); color: var(--muted); font-size: 14px; }

/* Skill animator. Uses the app's colour tokens (--surface, --ink, --accent …). */
.anim { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.anim-stage { position: relative; border: 1px solid var(--line); border-radius: var(--radius-card, 14px); overflow: hidden; background: var(--surface-2); }
.anim-viewport { aspect-ratio: 16 / 9; width: 100%; max-width: 100%; max-height: 62vh; }
.anim-caption { position: absolute; left: 10px; right: 10px; bottom: 10px; background: color-mix(in srgb, var(--surface) 90%, transparent); border-radius: 8px; padding: 6px 10px; font-size: 13px; color: var(--ink-2, var(--ink)); pointer-events: none; }
.anim-caption:empty { display: none; }
@media (max-width: 600px) { .anim-caption { position: static; border-radius: 0; border-top: 1px solid var(--line); background: var(--surface); } }
.anim-caption b { color: var(--ink); margin-right: 4px; }
.anim-controls { display: flex; align-items: center; gap: 10px; }
.anim-btn { font: inherit; font-size: 14px; font-weight: 500; height: 34px; padding: 0 12px; border-radius: var(--radius-control, 10px); border: 1px solid var(--line-strong, var(--line)); background: var(--surface); color: var(--ink); cursor: pointer; white-space: nowrap; }
.anim-btn:hover { background: var(--surface-2); }
.anim-btn:disabled { opacity: 0.55; cursor: progress; }
.anim-play { width: 44px; padding: 0; background: var(--accent); color: var(--accent-ink, #fff); border-color: transparent; }
.anim-play:hover { background: var(--accent); opacity: 0.9; }
.anim-scrub { position: relative; flex: 1; min-width: 0; }
.anim-scrub input { width: 100%; accent-color: var(--accent); }
.anim-marks { position: absolute; inset: auto 8px -2px 8px; height: 6px; pointer-events: none; }
.anim-marks span { position: absolute; width: 2px; height: 6px; background: var(--pad); border-radius: 1px; }
.anim-time { font-variant-numeric: tabular-nums; font-size: 13px; color: var(--muted); min-width: 3.5em; text-align: right; }
.anim-options { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; font-size: 13px; color: var(--muted); }
.anim-options select { font: inherit; font-size: 13px; height: 30px; padding: 0 6px; border-radius: 8px; border: 1px solid var(--line-strong, var(--line)); background: var(--surface); color: var(--ink); width: auto; }
.anim-check { display: inline-flex; align-items: center; gap: 4px; }
.anim-rec-status a { color: var(--accent); }
.anim-phases { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
@media (min-width: 720px) { .anim-phases { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); } }
.anim-phases button { display: flex; flex-direction: column; gap: 2px; width: 100%; height: 100%; text-align: left; font: inherit; font-size: 13px; color: var(--ink-2, var(--ink)); background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; cursor: pointer; }
.anim-phases button b { color: var(--ink); font-size: 14px; }
.anim-phases li[aria-current] button { border-color: var(--accent); background: var(--accent-soft); }
.anim-ph-t { font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
.anim-physics { font-size: 13px; color: var(--ink-2, var(--ink)); border: 1px solid var(--line); border-radius: 10px; background: var(--surface); padding: 8px 12px; }
.anim-physics summary { cursor: pointer; font-weight: 600; color: var(--ink); }
.anim-physics-scroll { overflow-x: auto; margin-top: 8px; }
.anim-physics table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
.anim-physics th, .anim-physics td { text-align: right; padding: 4px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.anim-physics thead th { font-weight: 600; font-size: 12px; white-space: normal; vertical-align: bottom; min-width: 70px; }
.anim-physics th[scope="row"], .anim-physics thead th:first-child { text-align: left; }
.anim-physics p { margin: 8px 0 0; }
.anim-note { margin: 0; font-size: 13px; color: var(--ink-2, var(--ink)); }
.anim-note:empty { display: none; }
.anim-disclaimer { margin: 0; font-size: 12px; color: var(--muted); }
.anim :focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.anim-studio { display: flex; flex-direction: column; gap: 14px; }
.anim-tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.anim-tabs button { font: inherit; font-size: 14px; border: 0; border-radius: 999px; padding: 6px 14px; background: var(--surface-2); color: var(--ink-2, var(--ink)); cursor: pointer; }
.anim-tabs button[aria-selected="true"] { background: var(--ink); color: var(--bg); }
.anim-panel { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; font-size: 14px; }
.anim-panel[hidden] { display: none; }
.anim-panel select, .anim-panel input { font: inherit; font-size: 14px; height: 36px; padding: 0 10px; border-radius: var(--radius-control, 10px); border: 1px solid var(--line-strong, var(--line)); background: var(--surface); color: var(--ink); width: auto; max-width: 100%; }
.anim-panel input { width: 8rem; font-family: var(--mono, ui-monospace, monospace); }
.anim-fig { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; }
.anim-help { margin: 0; flex-basis: 100%; font-size: 13px; color: var(--muted); line-height: 2; }
.anim-chip { font: inherit; font-size: 12px; border: 0; border-radius: 999px; padding: 3px 10px; background: var(--surface-2); color: var(--ink-2, var(--ink)); cursor: pointer; }
.anim-chip:hover { background: var(--line); }
.anim-error { margin: 0; flex-basis: 100%; color: var(--danger); font-size: 13px; }
.anim-error:empty { display: none; }
.anim-combo-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; flex-basis: 100%; }
.anim-combo-list { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0; padding: 0; flex-basis: 100%; counter-reset: c; }
.anim-combo-list li { counter-increment: c; display: inline-flex; align-items: center; gap: 4px; font-size: 13px; background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 3px 4px 3px 10px; }
.anim-combo-list li::before { content: counter(c) "."; font-weight: 600; }
.anim-combo-list li.anim-empty { background: none; color: var(--muted); padding-left: 0; }
.anim-combo-list li.anim-empty::before { content: none; }
.anim-x { border: 0; background: transparent; color: inherit; cursor: pointer; font-size: 12px; padding: 0 6px; }
.anim-link a { color: var(--accent); font-size: 13px; }