:root {
  --bg: #0b0c10;
  --surface: #111217;
  --muted: #1a1b23;
  --text: #e7e9ee;
  --text-muted: #a9afc3;
  --primary: #00b4cc;
  --primary-contrast: #0b1736;
  --accent: #6de3c1;
  --border: #262838;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
  --bg-gradient: radial-gradient(1200px 600px at 10% -20%, #111217 0%, #0b0c10 35%, #0b0c10 100%);
  --navbar-gradient: linear-gradient(180deg, rgba(17, 18, 23, 0.9) 0%, rgba(17, 18, 23, 0.75) 100%);
  --hero-kicker-gradient: linear-gradient(0deg, rgba(17, 18, 23, 1) 0%, rgba(17, 18, 23, 0.9) 100%);
  --surface-180-strong: linear-gradient(180deg, rgba(17, 18, 23, 1) 0%, rgba(17, 18, 23, 0.96) 100%);
  --surface-180-medium: linear-gradient(180deg, rgba(17, 18, 23, 1) 0%, rgba(17, 18, 23, 0.98) 100%);
  --mobile-nav-gradient: linear-gradient(180deg, rgba(17, 18, 23, 0.98) 0%, rgba(17, 18, 23, 0.94) 100%);
  --code-bg: #0e0f14;
  --nav-height: 68px;
}

[data-theme="light"] {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --muted: #f1f4f9;
  --text: #101322;
  --text-muted: #616a7f;
  --primary: #00b4cc;
  --primary-contrast: #e8f0ff;
  --accent: #00b894;
  --border: #d9deea;
  --shadow: 0 8px 30px rgba(16, 19, 34, 0.08);
  --bg-gradient: radial-gradient(1200px 600px at 10% -20%, #ffffff 0%, #f7f8fb 35%, #f7f8fb 100%);
  --navbar-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.82) 100%);
  --hero-kicker-gradient: linear-gradient(0deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0.96) 100%);
  --surface-180-strong: linear-gradient(180deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0.98) 100%);
  --surface-180-medium: linear-gradient(180deg, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0.98) 100%);
  --mobile-nav-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.94) 100%);
  --code-bg: #f5f7fb;
}

html {
  font-size: 16px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg-gradient);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(150%) blur(8px);
  background: var(--navbar-gradient);
  border-bottom: 1px solid var(--border);
  min-height: var(--nav-height);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
}

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

.brand .logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  box-shadow: var(--shadow);
}

.brand .title {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-links a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text);
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--muted);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.06s ease, background 0.2s ease, border-color 0.2s ease;
}

#menu-toggle {
  display: none;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
}

.hero {
  padding: 56px 0 8px;
  display: grid;
  gap: 22px;
}

.hero .kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px;
  background: var(--hero-kicker-gradient);
  width: max-content;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.2px;
}

.hero p {
  margin: 0;
  font-size: 1rem;
  color: var(--text-muted);
}

.grid {
  padding: 24px 0 44px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}

.card {
  grid-column: span 6;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-180-strong);
  box-shadow: var(--shadow);
  padding: 18px;
  display: grid;
  gap: 12px;
  transition: transform 0.06s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: 0 12px 40px rgba(91, 141, 239, 0.15);
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  overflow-wrap: anywhere;
  word-break: break-word;
}

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

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  padding: 24px 0 44px;
}

.sidebar {
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  overflow: auto;
  scroll-behavior: smooth;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-180-strong);
  padding: 16px;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .sidebar {
    position: relative;
    top: 0;
    height: auto;
    overflow: visible;
    padding: 12px;
  }
}

.sidebar h4 {
  margin: 0 0 10px 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.toc {
  display: grid;
  gap: 6px;
}

.toc a {
  display: block;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text);
  border: 1px solid transparent;
}

.toc a:hover {
  background: var(--muted);
  border-color: var(--border);
}

.toc a.active {
  background: var(--primary-contrast);
  border-color: var(--primary);
}

.content {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-180-medium);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.content h2 {
  margin-top: 12px;
  margin-bottom: 10px;
  font-size: 1.4rem;
  letter-spacing: -0.2px;
}

.content h3 {
  margin-top: 10px;
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.section {
  display: grid;
  gap: 8px;
  padding: 8px 0 16px;
  border-top: 1px dashed var(--border);
}

.section:first-of-type {
  border-top: 0;
}

.list {
  display: grid;
  gap: 8px;
  overflow-wrap: anywhere;
}

.kbd {
  display: inline-block;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--muted);
  font-size: 0.85em;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--muted);
  color: var(--text-muted);
  font-size: 0.85em;
}

.footer {
  padding: 32px 24px 44px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.search {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  margin-bottom: 12px;
}

.search input {
  width: 100%;
  padding: 8px 10px;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--text);
}

.search .kbd {
  align-self: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--muted);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.code {
  display: block;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--code-bg);
  overflow: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.95rem;
}

.code.highlight {
  border-color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--primary-contrast);
}

.mark {
  color: var(--primary);
  font-weight: 700;
}

.cmd {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 8px;
  background: var(--muted);
  color: var(--primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.alert {
  display: block;
  padding: 12px 14px;
  border-radius: 12px;
  border-left: 4px solid var(--primary);
  background: rgba(0, 180, 204, 0.12);
  color: var(--text);
}

.alert-info {
  border-left-color: var(--primary);
  background: rgba(0, 180, 204, 0.12);
}

.alert-warning {
  border-left-color: #ef9a00;
  background: rgba(239, 154, 0, 0.12);
}

.alert-danger {
  border-left-color: #e53935;
  background: rgba(229, 57, 53, 0.12);
}

.alert-success {
  border-left-color: #2e7d32;
  background: rgba(46, 125, 50, 0.12);
}

.row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.doc-img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  margin: 6px 0;
}

@media (max-width: 960px) {
  .nav-inner {
    padding: 12px 16px;
  }

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

  .card {
    grid-column: span 1;
  }

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

  .sidebar {
    position: relative;
    height: auto;
    padding: 12px;
  }

  .row {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}

@media (max-width: 640px) {
  :root {
    --nav-height: 72px;
  }

  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 40px 0 8px;
    gap: 18px;
  }

  .hero .kicker {
    font-size: 0.8rem;
    padding: 6px 10px;
  }

  .nav-inner {
    padding: 16px 18px;
  }

  .content {
    padding: 16px;
  }

  .toc a {
    padding: 8px 8px;
  }

  .code {
    font-size: 0.9rem;
    padding: 10px 12px;
  }

  .btn {
    padding: 6px 10px;
  }

  .pill {
    padding: 5px 8px;
    font-size: 0.8em;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    padding: 12px 24px;
    background: var(--mobile-nav-gradient);
    border-bottom: 1px solid var(--border);
  }

  .nav-links[data-open="true"] {
    display: grid;
    grid-template-columns: 1fr;
  }

  .nav-actions #menu-toggle {
    display: inline-flex;
  }
}