:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --panel: #ffffff;
  --panel-soft: #f2f4f8;
  --text: #111318;
  --muted: #69707d;
  --subtle: #949aa6;
  --border: #dfe3ea;
  --border-strong: #c8ced8;
  --accent: #1f6feb;
  --accent-soft: #edf4ff;
  --code-bg: #0e1525;
  --code-text: #edf4ff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.72;
}

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

code {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-soft);
  padding: 0.06rem 0.34rem;
  color: #24292f;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.doc-shell {
  display: grid;
  grid-template-columns: 288px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.92);
  padding: 32px 20px;
  overflow-y: auto;
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  margin-bottom: 36px;
  padding: 0 10px;
}

.brand strong,
.brand span {
  display: block;
  line-height: 1.24;
}

.brand strong {
  font-size: 20px;
  font-weight: 850;
}

.brand small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
}

.nav {
  display: grid;
  gap: 22px;
}

.nav-section,
.nav-group {
  display: grid;
  gap: 6px;
}

.nav-title,
.nav-group summary {
  margin: 0 10px 4px;
  color: var(--subtle);
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 30px;
  cursor: pointer;
  list-style: none;
}

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

.nav-group summary::after {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--subtle);
  border-bottom: 2px solid var(--subtle);
  transform: rotate(-45deg);
  transition: transform 160ms ease;
}

.nav-group[open] summary::after {
  transform: rotate(45deg);
}

.nav-group-links {
  display: grid;
  gap: 4px;
}

.nav a {
  display: flex;
  align-items: center;
  min-height: 38px;
  border-radius: 10px;
  padding: 0 10px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 720;
}

.nav a:hover,
.nav a.active {
  background: var(--accent-soft);
  color: var(--text);
}

.content {
  width: min(100%, 1160px);
  margin: 0 auto;
  padding: 0 42px 96px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  border-bottom: 1px solid rgba(223, 227, 234, 0.78);
  background: rgba(246, 247, 251, 0.9);
  backdrop-filter: blur(18px);
}

.mobile-doc-nav {
  display: none;
}

.compact {
  display: none;
  margin: 0;
  padding: 0;
  font-weight: 850;
}

.app-link,
.hero-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border: 1px solid var(--text);
  border-radius: 999px;
  padding: 0 16px;
  background: var(--text);
  color: #ffffff;
  font-size: 13px;
  font-weight: 800;
}

.app-link {
  border-color: var(--border-strong);
  background: var(--panel);
  color: var(--text);
}

.hero {
  padding: 78px 0 60px;
}

.eyebrow {
  display: inline-flex;
  margin-bottom: 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 11px;
  background: var(--panel);
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
  line-height: 1.16;
}

h1 {
  max-width: 820px;
  font-size: clamp(42px, 5.6vw, 74px);
}

.hero p,
.lead {
  max-width: 840px;
  color: var(--muted);
  font-size: 18px;
}

.hero p {
  margin: 24px 0 0;
}

.hero-subtitle {
  margin: 42px 0 16px;
  font-size: clamp(26px, 3vw, 38px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-actions .secondary {
  border-color: var(--border-strong);
  background: var(--panel);
  color: var(--text);
}

.doc-section {
  padding: 58px 0;
}

.hero,
.doc-section {
  display: none;
}

.hero.active-page,
.doc-section.active-page {
  display: block;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.section-heading span {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 12px;
  background: var(--text);
  color: #ffffff;
  font-size: 14px;
  font-weight: 900;
}

.section-heading h2 {
  font-size: clamp(28px, 3.2vw, 42px);
}

.lead {
  margin: 0 0 24px;
}

.format-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 980px;
  margin: -4px 0 12px;
}

.format-list article {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  padding: 13px 15px;
}

.format-list span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 13px;
  font-weight: 850;
}

.format-list code {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.helper-text {
  max-width: 840px;
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.feature-grid,
.rule-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.feature-grid article,
.rule-list article {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 10px 30px rgba(17, 19, 24, 0.04);
}

.feature-grid article,
.rule-list article {
  padding: 20px;
}

.feature-grid h3,
.rule-list h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.feature-grid p,
.rule-list p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.notice {
  margin: 22px 0 0;
  border: 1px solid #f0c998;
  border-radius: 12px;
  background: #fff6e9;
  padding: 16px 18px;
  color: #6b3b00;
  font-size: 15px;
}

.notice strong {
  display: block;
  margin-bottom: 4px;
  color: #321a00;
}

.notice.neutral {
  border-color: var(--border);
  background: var(--panel);
  color: var(--muted);
}

.notice.neutral strong {
  color: var(--text);
}

.code-block {
  position: relative;
  margin: 22px 0;
  border-radius: 12px;
  background: var(--code-bg);
  color: var(--code-text);
  overflow: hidden;
  box-shadow: 0 18px 44px rgba(17, 19, 24, 0.16);
}

.code-block pre {
  margin: 0;
  overflow-x: auto;
  padding: 24px;
}

.code-block code {
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: 14px;
  line-height: 1.8;
  white-space: pre-wrap;
}

.code-block.large pre {
  max-height: 620px;
  padding-top: 52px;
}

.copy {
  position: absolute;
  top: 12px;
  right: 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  padding: 7px 11px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
}

.subhead {
  margin: 28px 0 12px;
  font-size: 18px;
}

.tag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(218px, 1fr));
  gap: 10px;
}

.tag-grid span {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  padding: 11px 12px;
  color: var(--muted);
  font-size: 14px;
}

.tag-grid code {
  margin-right: 6px;
  color: var(--text);
}

.voice-search-panel {
  margin-top: 28px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--panel);
  padding: 22px;
  box-shadow: 0 16px 42px rgba(17, 19, 24, 0.06);
}

.voice-search-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.voice-search-heading h3 {
  font-size: 22px;
}

.voice-search-heading p {
  max-width: 720px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.voice-search-heading a,
.voice-search-form button,
.voice-result-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--text);
  border-radius: 999px;
  background: var(--text);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 850;
  white-space: nowrap;
}

.voice-search-heading a {
  min-height: 36px;
  padding: 0 14px;
}

.voice-search-form {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto;
  gap: 12px;
  align-items: end;
}

.voice-search-form label {
  display: grid;
  gap: 7px;
  min-width: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.voice-search-form input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: #ffffff;
  color: var(--text);
  padding: 0 13px;
  font: inherit;
  font-size: 15px;
  outline: none;
}

.voice-search-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.12);
}

.voice-search-form button {
  min-height: 44px;
  padding: 0 18px;
}

.voice-search-form button:disabled {
  cursor: wait;
  opacity: 0.72;
}

.voice-search-status {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.voice-search-status.error {
  color: #b42318;
}

.voice-result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.voice-result-card {
  display: grid;
  gap: 10px;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel-soft);
  padding: 16px;
}

.voice-result-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.voice-result-title strong {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 17px;
}

.voice-result-title span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.voice-result-id {
  width: 100%;
  overflow-wrap: anywhere;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #ffffff;
  padding: 9px 10px;
  color: var(--text);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  line-height: 1.5;
}

.voice-result-desc,
.voice-result-tags {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.voice-result-desc {
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.voice-result-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.voice-result-tags span {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #ffffff;
  padding: 2px 8px;
}

.voice-result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.voice-result-actions button {
  min-height: 32px;
  padding: 0 12px;
}

.voice-result-actions .secondary {
  border-color: var(--border-strong);
  background: #ffffff;
  color: var(--text);
}

@media (max-width: 920px) {
  .doc-shell {
    display: block;
  }

  .sidebar {
    display: none;
  }

  .content {
    padding: 0 18px 72px;
  }

  .compact {
    display: flex;
  }

  .topbar {
    height: 64px;
  }

  .mobile-doc-nav {
    position: sticky;
    top: 64px;
    z-index: 4;
    display: block;
    border-bottom: 1px solid var(--border);
    background: rgba(246, 247, 251, 0.94);
    padding: 12px 0;
    backdrop-filter: blur(18px);
  }

  .mobile-doc-nav select {
    width: 100%;
    min-height: 42px;
    border: 1px solid var(--border-strong);
    border-radius: 12px;
    background: var(--panel);
    color: var(--text);
    padding: 0 12px;
    font: inherit;
    font-weight: 750;
  }

  .app-link {
    min-height: 34px;
    padding: 0 12px;
    font-size: 12px;
  }

  .hero {
    padding: 44px 0 42px;
  }

  .hero p,
  .lead {
    font-size: 16px;
  }

  .format-list {
    grid-template-columns: 1fr;
  }

  .format-list article {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .format-list code {
    max-width: 100%;
  }

  .feature-grid,
  .rule-list {
    grid-template-columns: 1fr;
  }

  .doc-section {
    padding: 42px 0;
  }

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

  .section-heading span {
    flex: 0 0 auto;
  }

  .tag-grid {
    grid-template-columns: 1fr;
  }

  .voice-search-panel {
    padding: 16px;
  }

  .voice-search-heading,
  .voice-search-form {
    display: grid;
    grid-template-columns: 1fr;
  }

  .voice-search-heading a,
  .voice-search-form button {
    width: 100%;
  }

  .voice-result-grid {
    grid-template-columns: 1fr;
  }
}