:root {
  --navy: #283593;
  --navy-dark: #1a237e;
  --indigo: #6366f1;
  --indigo-light: #818cf8;
  --sky: #4fc3f7;
  --pink: #ec407a;
  --orange: #ffb74d;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --code-bg: #0f172a;
  --sidebar-w: 280px;
  --header-h: 64px;
  --radius: 10px;
  --shadow: 0 1px 3px rgb(15 23 42 / 8%), 0 8px 24px rgb(15 23 42 / 6%);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
}

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

a:hover {
  color: var(--navy);
  text-decoration: underline;
}

/* ── Layout ── */
.docs-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: linear-gradient(180deg, var(--navy-dark) 0%, var(--navy) 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  z-index: 100;
  border-right: 1px solid rgb(255 255 255 / 8%);
}

.sidebar-brand {
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid rgb(255 255 255 / 10%);
}

.sidebar-brand a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}

.sidebar-brand img {
  height: 36px;
  width: auto;
  border-radius: 6px;
  background: #fff;
  padding: 4px 6px;
}

.sidebar-brand span {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
}

.version-badge {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.15rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 999px;
  background: rgb(99 102 241 / 35%);
  color: #e0e7ff;
  border: 1px solid rgb(129 140 248 / 40%);
}

.sidebar-search {
  padding: 0.75rem 1rem;
}

.sidebar-search input {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid rgb(255 255 255 / 15%);
  border-radius: 8px;
  background: rgb(0 0 0 / 20%);
  color: #fff;
  font-size: 0.875rem;
}

.sidebar-search input::placeholder {
  color: rgb(255 255 255 / 45%);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0 1.5rem;
}

.nav-group {
  margin-bottom: 0.25rem;
}

.nav-group-title {
  padding: 0.65rem 1.25rem 0.35rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgb(255 255 255 / 45%);
}

.nav-link {
  display: block;
  padding: 0.45rem 1.25rem 0.45rem 1.5rem;
  color: rgb(255 255 255 / 78%);
  font-size: 0.875rem;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
  background: rgb(255 255 255 / 6%);
  color: #fff;
  text-decoration: none;
}

.nav-link.active {
  background: rgb(99 102 241 / 25%);
  color: #fff;
  border-left-color: var(--sky);
  font-weight: 600;
}

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgb(255 255 255 / 10%);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-footer a {
  color: rgb(255 255 255 / 65%);
  font-size: 0.8rem;
  text-decoration: none;
}

.sidebar-footer a:hover {
  color: var(--sky);
}

.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgb(255 255 255 / 85%);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}

.topbar-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.topbar-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.topbar-actions a {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}

.topbar-actions a.primary {
  background: var(--indigo);
  border-color: var(--indigo);
  color: #fff;
}

.topbar-actions a.primary:hover {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
  text-decoration: none;
}

.content-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

/* ── Hero (landing) ── */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--indigo) 55%, #7c3aed 100%);
  border-radius: 16px;
  padding: 2.75rem 2.5rem;
  color: #fff;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--sky) 0%, transparent 70%);
  opacity: 0.25;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.hero p {
  margin: 0;
  font-size: 1.05rem;
  opacity: 0.92;
  max-width: 540px;
}

.hero-dots {
  display: flex;
  gap: 6px;
  margin-top: 1.25rem;
}

.hero-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.hero-dots span:nth-child(1) { background: var(--sky); }
.hero-dots span:nth-child(2) { background: var(--pink); }
.hero-dots span:nth-child(3) { background: var(--orange); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgb(15 23 42 / 10%);
  text-decoration: none;
  color: inherit;
}

.card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  color: var(--navy);
}

.card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.card-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
  background: #eef2ff;
  color: var(--indigo);
}

/* ── Markdown content ── */
.doc-content h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--navy);
  margin: 0 0 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border);
}

.doc-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--navy);
  margin: 2.5rem 0 1rem;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.doc-content h3 {
  font-size: 1.15rem;
  font-weight: 650;
  margin: 1.75rem 0 0.75rem;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.doc-content h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.25rem 0 0.5rem;
}

.doc-content p,
.doc-content li {
  color: var(--text);
}

.doc-content ul,
.doc-content ol {
  padding-left: 1.35rem;
}

.doc-content li {
  margin: 0.35rem 0;
}

.doc-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.doc-content blockquote {
  margin: 1.25rem 0;
  padding: 0.85rem 1.1rem;
  border-left: 4px solid var(--indigo);
  background: #eef2ff;
  border-radius: 0 8px 8px 0;
  color: var(--navy-dark);
  font-size: 0.925rem;
}

.doc-content blockquote p {
  margin: 0;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin: 1.25rem 0;
  display: block;
  overflow-x: auto;
}

.doc-content th,
.doc-content td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.85rem;
  text-align: left;
}

.doc-content th {
  background: #f1f5f9;
  font-weight: 600;
  color: var(--navy);
}

.doc-content tr:nth-child(even) td {
  background: #fafbfc;
}

.doc-content code:not(pre code) {
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  font-size: 0.85em;
  background: #f1f5f9;
  color: #be185d;
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.code-block-wrap {
  position: relative;
  margin: 1.25rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.code-block-wrap pre {
  margin: 0;
  padding: 1.1rem 1.25rem;
  background: var(--code-bg);
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.55;
}

.code-block-wrap pre code {
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  color: #e2e8f0;
  background: none;
  padding: 0;
}

.code-lang {
  position: absolute;
  top: 0;
  left: 0;
  padding: 0.25rem 0.65rem;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgb(255 255 255 / 50%);
  background: rgb(0 0 0 / 30%);
  border-bottom-right-radius: 6px;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.3rem 0.65rem;
  font-size: 0.72rem;
  font-weight: 600;
  border: 1px solid rgb(255 255 255 / 15%);
  border-radius: 6px;
  background: rgb(255 255 255 / 8%);
  color: rgb(255 255 255 / 80%);
  cursor: pointer;
}

.copy-btn:hover {
  background: rgb(255 255 255 / 15%);
  color: #fff;
}

.copy-btn.copied {
  background: rgb(79 195 247 / 25%);
  border-color: var(--sky);
  color: var(--sky);
}

.loading {
  text-align: center;
  padding: 4rem;
  color: var(--text-muted);
}

.loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--indigo);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.error-banner {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin: 1rem 0;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main {
    margin-left: 0;
  }

  .mobile-toggle {
    display: block;
  }

  .content-wrap {
    padding: 1.5rem 1.25rem 3rem;
  }

  .topbar {
    padding: 0 1rem;
  }
}