:root {
  color-scheme: dark;
  --bg: #07100e;
  --panel: #0d1a16;
  --panel-strong: #12251f;
  --line: #244238;
  --text: #eefbf6;
  --muted: #9db6ac;
  --accent: #67f6bd;
  --accent-2: #8bc5ff;
  --warm: #ffc76d;
  --danger: #ff8f7d;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  --max: 1240px;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f8f5;
  --panel: #ffffff;
  --panel-strong: #eaf5ef;
  --line: #c9ddd3;
  --text: #10241d;
  --muted: #557066;
  --accent: #087a54;
  --accent-2: #176db6;
  --warm: #9a5b00;
  --danger: #b33a2b;
  --shadow: 0 24px 60px rgba(32, 72, 57, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(rgba(103, 246, 189, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(103, 246, 189, 0.045) 1px, transparent 1px),
    radial-gradient(circle at 12% 8%, rgba(103, 246, 189, 0.11), transparent 28rem),
    var(--bg);
  background-size: 64px 64px, 64px 64px, auto, auto;
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 20;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--accent);
  color: #04110c;
  font-weight: 800;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 12px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--accent);
  border-radius: 13px;
  background: rgba(103, 246, 189, 0.12);
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-weight: 900;
}

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

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-actions a,
.header-actions button {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  text-decoration: none;
}

.header-actions a:hover,
.header-actions button:hover {
  border-color: var(--accent);
  color: var(--text);
}

.landing-shell,
.doc-layout {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 48px;
  padding: 88px 0 56px;
  align-items: end;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1,
.doc-article h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 86px);
  letter-spacing: -0.055em;
  line-height: 1.02;
}

.hero-copy {
  margin: 26px 0 0;
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 21px);
}

.source-panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.source-panel strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.source-panel p {
  margin: 0 0 16px;
  color: var(--muted);
}

.source-panel a {
  color: var(--accent);
  font-weight: 800;
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  margin-bottom: 64px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
}

.stat {
  padding: 20px 24px;
  border-right: 1px solid var(--line);
}

.stat:last-child {
  border-right: 0;
}

.stat strong,
.stat span {
  display: block;
}

.stat strong {
  font-size: 28px;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.surface-section,
.directory-section,
.policy-section {
  padding: 24px 0 72px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.section-heading p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
}

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

.surface-card {
  position: relative;
  display: flex;
  min-height: 248px;
  flex-direction: column;
  padding: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(145deg, var(--panel-strong), var(--panel));
}

.surface-card::after {
  position: absolute;
  right: -26px;
  top: -44px;
  width: 154px;
  height: 154px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  content: "";
  opacity: 0.18;
}

.surface-number {
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
}

.surface-card h3 {
  margin: 42px 0 6px;
  font-size: 28px;
}

.surface-card p {
  margin: 0;
  color: var(--muted);
}

.surface-card a {
  width: fit-content;
  margin-top: auto;
  color: var(--accent);
  font-weight: 800;
}

.directory-toolbar {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto;
  gap: 16px;
  margin-bottom: 28px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}

.search-box input {
  width: 100%;
  padding: 13px 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
}

.search-result-count {
  align-self: center;
  color: var(--muted);
  font-size: 14px;
}

.directory-group {
  margin-bottom: 22px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
}

.directory-group summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

.directory-group summary::-webkit-details-marker {
  display: none;
}

.directory-group summary strong {
  font-size: 20px;
}

.directory-group summary span {
  margin-left: auto;
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
}

.directory-group summary p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.directory-pages {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  border-top: 1px solid var(--line);
  background: var(--line);
}

.directory-page {
  display: flex;
  min-height: 92px;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--panel);
  text-decoration: none;
}

.directory-page:hover {
  background: var(--panel-strong);
}

.directory-page-index {
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}

.directory-page strong,
.directory-page small {
  display: block;
}

.directory-page small {
  color: var(--muted);
}

.policy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.policy-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
}

.policy-card strong {
  display: block;
  margin-bottom: 8px;
}

.policy-card p {
  margin: 0;
  color: var(--muted);
}

.doc-layout {
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  gap: 52px;
  padding: 48px 0 80px;
}

.doc-sidebar {
  position: sticky;
  top: 104px;
  align-self: start;
  max-height: calc(100vh - 128px);
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
}

.doc-sidebar h2 {
  margin: 0 0 12px;
  font-size: 16px;
}

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

.sidebar-section > strong {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.sidebar-section a {
  display: block;
  padding: 7px 9px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
}

.sidebar-section a:hover,
.sidebar-section a[aria-current="page"] {
  background: var(--panel-strong);
  color: var(--accent);
}

.doc-article {
  min-width: 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb a {
  color: var(--muted);
}

.doc-article h1 {
  max-width: 900px;
  font-size: clamp(38px, 6vw, 70px);
}

.official-title {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.doc-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 42px;
}

.badge {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
}

.badge.is-accent {
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line));
  color: var(--accent);
}

.learning-card,
.outline-card,
.source-card,
.license-card {
  margin: 18px 0;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
}

.learning-card h2,
.outline-card h2,
.source-card h2,
.license-card h2 {
  margin: 0 0 14px;
  font-size: 25px;
}

.learning-card > p,
.outline-card > p,
.source-card > p,
.license-card > p {
  color: var(--muted);
}

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

.learning-list li {
  position: relative;
  padding: 13px 16px 13px 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-strong);
}

.learning-list li::before {
  position: absolute;
  left: 16px;
  color: var(--accent);
  content: "→";
  font-weight: 900;
}

.official-outline {
  display: grid;
  gap: 1px;
  overflow: hidden;
  padding: 1px;
  border-radius: 14px;
  background: var(--line);
}

.outline-item {
  display: flex;
  gap: 12px;
  padding: 12px 16px;
  background: var(--panel-strong);
}

.outline-item span {
  color: var(--accent-2);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
}

.source-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  padding: 11px 16px;
  border-radius: 12px;
  font-weight: 800;
  text-decoration: none;
}

.primary-action {
  background: var(--accent);
  color: #04110c;
}

.secondary-action {
  border: 1px solid var(--line);
  color: var(--accent-2);
}

.source-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.source-meta div {
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.source-meta strong,
.source-meta code {
  display: block;
}

.source-meta strong {
  color: var(--muted);
  font-size: 12px;
}

.source-meta code {
  overflow-wrap: anywhere;
  color: var(--text);
}

.license-card {
  border-color: color-mix(in srgb, var(--warm) 34%, var(--line));
}

.license-card h2 {
  color: var(--warm);
}

.doc-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.doc-pager a {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--muted);
  text-decoration: none;
}

.doc-pager a:last-child {
  text-align: right;
}

.doc-pager strong {
  display: block;
  color: var(--text);
}

.empty-pager {
  min-height: 1px;
}

.site-footer {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
  padding: 28px 0 46px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.site-footer p {
  margin: 4px 0;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .hero,
  .doc-layout {
    grid-template-columns: 1fr;
  }

  .doc-sidebar {
    position: static;
    max-height: 360px;
  }

  .stat-strip,
  .policy-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat:nth-child(2) {
    border-right: 0;
  }

  .stat:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 680px) {
  .site-header {
    align-items: flex-start;
    padding: 12px 18px;
  }

  .brand small,
  .header-actions a {
    display: none;
  }

  .landing-shell,
  .doc-layout,
  .site-footer {
    width: min(calc(100% - 28px), var(--max));
  }

  .hero {
    gap: 28px;
    padding-top: 58px;
  }

  .surface-grid,
  .directory-pages,
  .policy-grid,
  .source-meta,
  .doc-pager {
    grid-template-columns: 1fr;
  }

  .section-heading {
    display: block;
  }

  .section-heading p {
    margin-top: 12px;
  }

  .stat-strip {
    grid-template-columns: 1fr 1fr;
  }

  .directory-toolbar {
    grid-template-columns: 1fr;
  }

  .directory-group summary p {
    display: none;
  }

  .doc-pager a:last-child {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}