:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --card-bg: #f9fafb;
  --card-hover: #f3f4f6;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --accent-soft: #dbeafe;
  --success: #047857;
  --success-soft: #d1fae5;
  --warning: #b45309;
  --warning-soft: #fef3c7;
  --info: #0369a1;
  --info-soft: #e0f2fe;
  --surface: #ffffff;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --radius: 8px;
  --maxw: 760px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #8b949e;
    --border: #21262d;
    --card-bg: #161b22;
    --card-hover: #1c2330;
    --accent: #4493f8;
    --accent-fg: #0d1117;
    --accent-soft: #10233f;
    --success: #34d399;
    --success-soft: #063b2c;
    --warning: #fbbf24;
    --warning-soft: #3f2d08;
    --info: #38bdf8;
    --info-soft: #082f49;
    --surface: #0f1623;
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.75;
  font-size: 16px;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 24px 96px;
}

header.site {
  margin-bottom: 40px;
}

header.site h1 {
  font-size: 1.9rem;
  margin: 0 0 8px;
  letter-spacing: 0;
}

header.site p {
  margin: 0;
  color: var(--muted);
}

h2 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 48px 0 16px;
}

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

a:hover {
  text-decoration: underline;
}

/* Link cards are clickable navigation only: use a.card[href]. */
.cards {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .cards.two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cards.three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

a.card[href] {
  display: block;
  padding: 18px 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: inherit;
  transition: background 0.15s ease, border-color 0.15s ease;
}

a.card[href]:hover {
  background: var(--card-hover);
  border-color: var(--accent);
  text-decoration: none;
}

/* Non-link information blocks use a separate vocabulary and no pointer affordance. */
.info-card {
  display: block;
  padding: 18px 20px 18px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--muted);
  border-radius: var(--radius);
  cursor: default;
}

a.card[href] .title,
.info-card .title {
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 4px;
}

a.card[href] .desc,
.info-card .desc {
  color: var(--muted);
  font-size: 0.9rem;
}

/* 本文ページ向け */
main.doc h1 {
  font-size: 1.8rem;
  letter-spacing: 0;
  margin: 0 0 12px;
}

main.doc h2 {
  color: var(--fg);
  text-transform: none;
  letter-spacing: normal;
  font-size: 1.35rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

main.doc h3 {
  font-size: 1.1rem;
}

main.doc code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 6px;
}

main.doc pre {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
}

main.doc pre code {
  background: none;
  border: none;
  padding: 0;
}

main.doc blockquote {
  margin: 16px 0;
  padding: 4px 18px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.toc {
  margin: 28px 0;
  padding: 16px 18px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.toc-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 8px;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
}

.toc li {
  margin: 4px 0;
}

.toc .toc-h3 {
  margin-left: 16px;
}

main.doc .lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 24px;
}

.component-library section {
  margin: 48px 0;
}

main.doc table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
}

main.doc th,
main.doc td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

main.doc th {
  background: var(--card-bg);
}

.back-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: 24px;
}

.back {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 0.9rem;
}

.back-links .back {
  margin-bottom: 0;
}

footer.site {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

/* コンポーネント語彙 */
.hero {
  display: grid;
  gap: 18px;
  margin: 24px 0 40px;
  padding: 32px;
  background: linear-gradient(135deg, var(--card-bg), var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero .eyebrow,
.section-label {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.doc .hero h1 {
  margin: 0;
  font-size: 2.15rem;
  line-height: 1.25;
}

.hero p {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--fg);
  background: var(--surface);
  font-weight: 600;
  line-height: 1.3;
}

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

.button:hover {
  text-decoration: none;
  border-color: var(--accent);
}

.callout {
  margin: 16px 0;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--info);
  border-radius: var(--radius);
  background: var(--info-soft);
}

.callout.warning {
  border-left-color: var(--warning);
  background: var(--warning-soft);
}

.callout.tip {
  border-left-color: var(--success);
  background: var(--success-soft);
}

.callout .title {
  margin: 0 0 4px;
  font-weight: 700;
}

.callout p {
  margin: 0;
}

.steps {
  display: grid;
  gap: 14px;
  margin: 16px 0;
  padding: 0;
  list-style: none;
  counter-reset: steps;
}

.steps li {
  position: relative;
  padding: 16px 18px 16px 58px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
  counter-increment: steps;
}

.steps li::before {
  position: absolute;
  top: 16px;
  left: 18px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--accent-fg);
  background: var(--accent);
  content: counter(steps);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
}

.steps .title {
  margin: 0 0 4px;
  font-weight: 700;
}

.figure-panel {
  margin: 20px 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
}

.figure-panel img,
.figure-panel svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.figure-panel figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

pre.mermaid {
  min-height: 160px;
  white-space: pre-wrap;
  text-align: center;
}

.compare {
  display: grid;
  gap: 12px;
  margin: 16px 0;
}

@media (min-width: 720px) {
  .compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.compare > div,
.stat,
.timeline li,
.code-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
}

.compare > div {
  padding: 16px 18px;
}

.stats {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin: 16px 0;
}

.stat {
  padding: 16px;
}

.stat .value {
  display: block;
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1.2;
}

.stat .label {
  color: var(--muted);
  font-size: 0.9rem;
}

.timeline {
  display: grid;
  gap: 12px;
  margin: 16px 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  position: relative;
  padding: 16px 18px 16px 42px;
}

.timeline li::before {
  position: absolute;
  top: 22px;
  left: 18px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: var(--bg);
  content: "";
}

.timeline time {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
}

details.disclosure {
  margin: 16px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
}

details.disclosure summary {
  cursor: pointer;
  padding: 14px 16px;
  font-weight: 700;
}

details.disclosure > div {
  padding: 0 16px 16px;
}

.code-block {
  margin: 16px 0;
  overflow: hidden;
}

.code-block .code-title {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

main.doc .code-block pre {
  margin: 0;
  border: 0;
  border-radius: 0;
}

@media (max-width: 640px) {
  .container {
    padding: 36px 18px 72px;
  }

  .hero {
    padding: 24px;
  }

  .doc .hero h1 {
    font-size: 1.75rem;
  }
}