:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-subtle: #edf1f4;
  --border: #d9e0e6;
  --border-subtle: #e8edf1;
  --text: #17212b;
  --text-muted: #596775;
  --text-faint: #7f8b96;
  --accent: #a85000;
  --accent-subtle: #fff1df;
  --card: var(--surface);
  --fg: var(--text);
  --muted: var(--text-muted);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Pretendard Variable", Pretendard, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas,
    monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101419;
  --surface: #181e24;
  --surface-subtle: #222a32;
  --border: #35404a;
  --border-subtle: #29323a;
  --text: #e8edf1;
  --text-muted: #a2adb7;
  --text-faint: #7f8b96;
  --accent: #f0a34a;
  --accent-subtle: #352719;
}

* {
  box-sizing: border-box;
}

html {
  scrollbar-gutter: stable;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
}

a {
  color: var(--accent);
}

.navbar {
  background: var(--surface);
  border-bottom-color: var(--border);
}

.nav-inner {
  width: min(1180px, 100%);
  max-width: 1180px;
  height: 56px;
}

.nav-title {
  color: var(--text);
  letter-spacing: -0.01em;
  text-decoration: none;
}

.nav-title:hover {
  color: var(--accent);
  text-decoration: none;
}

.nav-actions {
  gap: 18px;
}

.section-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.section-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 11px;
  border: 1px solid transparent;
  border-radius: 7px;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 550;
  white-space: nowrap;
  transition:
    background-color 140ms ease,
    border-color 140ms ease,
    color 140ms ease;
}

.section-nav a:hover {
  background: var(--surface-subtle);
  color: var(--text);
  text-decoration: none;
}

.section-nav a[aria-current="page"] {
  background: var(--accent-subtle);
  border-color: color-mix(in srgb, var(--accent) 22%, transparent);
  color: var(--accent);
}

.theme-btn {
  border-color: var(--border);
  border-radius: 7px;
  color: var(--text-muted);
}

.theme-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.container {
  width: min(1180px, 100%);
  max-width: 1180px;
  padding: 36px 24px 80px;
}

.page-header {
  margin-bottom: 36px;
}

.title-row {
  gap: 14px;
  margin-bottom: 10px;
}

h1 {
  letter-spacing: -0.04em;
}

.version-tag {
  border-radius: 6px;
}

.page-desc {
  max-width: 68ch;
  line-height: 1.7;
}

.section {
  margin-bottom: 38px;
}

.section-header {
  border-bottom-color: var(--border);
}

.summary-card,
.specs-grid,
.parity-card,
.note-card,
.corpus-block,
.segment-control {
  border-color: var(--border);
  border-radius: 10px;
}

.overview-section {
  margin: 0 0 34px;
}

.overview-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.overview-heading h2 {
  margin: 0;
  font-size: 1.3rem;
  letter-spacing: -0.025em;
}

.overview-heading p {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.overview-heading > a {
  flex: none;
  font-size: 0.84rem;
  font-weight: 600;
}

.overview-panel {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

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

.overview-meta {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.79rem;
}

.overview-table {
  width: 100%;
  border-collapse: collapse;
  color: var(--text);
  font-size: 0.88rem;
  text-align: left;
}

.overview-table th,
.overview-table td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.overview-table thead th {
  background: var(--surface-subtle);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 650;
  white-space: nowrap;
}

.overview-table tbody th {
  font-weight: 600;
}

.overview-table td:not(:first-child),
.overview-table thead th:not(:first-child) {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.overview-table tbody tr:last-child th,
.overview-table tbody tr:last-child td {
  border-bottom: 0;
}

.overview-footnote {
  margin: 0;
  padding: 12px 16px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.84rem;
}

.overview-footnote strong {
  color: var(--text);
}

.overview-subtitle {
  margin: 0;
  padding: 11px 16px;
  border-top: 1px solid var(--border-subtle);
  background: var(--surface-subtle);
  font-size: 0.79rem;
  font-weight: 650;
}

.runtime-api {
  margin-left: 6px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
}

.overview-loading,
.overview-error {
  margin: 0;
  padding: 18px 16px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.overview-error {
  color: #a33b32;
}

:root[data-theme="dark"] .overview-error {
  color: #f0958d;
}

.theme-btn:focus-visible,
.section-nav a:focus-visible,
.nav-back:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (max-width: 760px) {
  .nav-inner {
    height: auto;
    min-height: 56px;
    flex-wrap: wrap;
    gap: 6px 12px;
    padding: 8px 16px;
  }

  .nav-actions {
    width: 100%;
    gap: 8px;
    justify-content: space-between;
  }

  .section-nav {
    min-width: 0;
    flex: 1;
    overflow-x: auto;
  }

  .section-nav a {
    min-height: 32px;
    padding: 0 9px;
  }

  .container {
    padding: 28px 16px 60px;
  }

  .overview-heading {
    align-items: flex-start;
  }

  .overview-heading > a {
    margin-top: 4px;
    white-space: nowrap;
  }

  .overview-table {
    min-width: 440px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}