:root {
  --bg: #f8fafc;
  --panel: #ffffff;
  --panel-muted: #f8fafc;
  --border: #dbe4f0;
  --border-strong: #c6d4e3;
  --text: #0f172a;
  --muted: #475569;
  --muted-2: #64748b;
  --brand: #2563eb;
  --brand-strong: #1d4ed8;
  --brand-soft: #eff6ff;
  --code-bg: #f6f8fa;
  --code-border: #d0d7de;
  --success: #166534;
  --warning: #92400e;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.07);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), transparent 30%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 35%, #f8fafc 100%);
}

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-strong); }
code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.site-shell { min-height: 100vh; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(203, 213, 225, 0.85);
}
.topbar-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text);
}
.brand img { width: 168px; height: auto; }
.brand-copy { display: flex; flex-direction: column; gap: 0.15rem; }
.brand-kicker {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.brand-title {
  font-size: 0.95rem;
  color: var(--muted);
  font-weight: 600;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.topnav a {
  display: inline-flex;
  align-items: center;
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
}
.topnav a:hover { background: var(--brand-soft); color: var(--brand-strong); }
.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 0.9rem;
  padding: 0.55rem 0.8rem;
  font-weight: 700;
  color: var(--text);
}

.page {
  max-width: 1320px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}
.hero {
  padding: 1rem 0 2rem;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.16);
  color: var(--brand-strong);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.hero h1 {
  margin: 1rem 0 0.8rem;
  font-family: "Space Grotesk", Inter, sans-serif;
  font-size: clamp(2.4rem, 5vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}
.hero p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.75;
}
.hero-actions {
  margin-top: 1.4rem;
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.2rem;
  border-radius: 1rem;
  font-weight: 700;
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: white;
  box-shadow: 0 10px 26px rgba(37, 99, 235, 0.22);
}
.btn-primary:hover { color: white; filter: brightness(1.03); }
.btn-secondary {
  background: white;
  color: var(--brand-strong);
  border-color: var(--border-strong);
}

.docs-layout {
  display: grid;
  grid-template-columns: minmax(0, 18rem) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}
.sidebar {
  position: sticky;
  top: 5.9rem;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  border-radius: 1.35rem;
  box-shadow: var(--shadow);
  padding: 1.1rem;
}
.sidebar-group + .sidebar-group { margin-top: 1.15rem; }
.sidebar-label {
  font-size: 0.74rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted-2);
  margin: 0 0 0.55rem;
}
.sidebar a {
  display: block;
  padding: 0.7rem 0.82rem;
  border-radius: 0.85rem;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}
.sidebar a:hover { background: #f8fafc; color: var(--text); }
.sidebar a.active {
  background: var(--brand-soft);
  color: var(--brand-strong);
  border: 1px solid rgba(37, 99, 235, 0.16);
}
.sidebar hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 1rem 0;
}
.sidebar-card {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 1rem;
  background: linear-gradient(180deg, rgba(239, 246, 255, 0.9) 0%, rgba(248, 250, 252, 0.92) 100%);
  border: 1px solid rgba(37, 99, 235, 0.12);
}
.sidebar-card h4 {
  margin: 0 0 0.35rem;
  font-size: 0.98rem;
}
.sidebar-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.55;
}

.article {
  min-width: 0;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(219, 228, 240, 0.8);
  border-radius: 1.5rem;
  box-shadow: var(--shadow);
  padding: 1.8rem 2rem 2.4rem;
}
.article-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}
.article-header h2,
.section h2,
.section h3 {
  font-family: "Space Grotesk", Inter, sans-serif;
  letter-spacing: -0.03em;
}
.article-header h2 {
  margin: 0.35rem 0 0.6rem;
  font-size: 2rem;
}
.lead {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.75;
}
.outline-grid, .card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.outline-card, .card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1.2rem;
  padding: 1.15rem 1.2rem;
}
.outline-card h3, .card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
}
.outline-card ul, .card p, .card ul {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}
.chapter-links a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  border: 1px solid var(--border);
  background: #fbfdff;
  margin-top: 0.55rem;
}
.kbd {
  font-size: 0.72rem;
  color: var(--muted-2);
  padding: 0.18rem 0.45rem;
  border-radius: 999px;
  background: #f1f5f9;
}

.eyebrow {
  margin: 0;
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--brand-strong);
}
.section {
  padding-top: 1.1rem;
  margin-top: 1.25rem;
}
.section:first-of-type { margin-top: 0; }
.section h2 {
  margin: 0.45rem 0 0.8rem;
  font-size: 1.85rem;
}
.section h3 {
  margin: 1.2rem 0 0.6rem;
  font-size: 1.28rem;
}
.section p,
.section li,
.section dd {
  color: var(--muted);
  line-height: 1.78;
  font-size: 1rem;
}
.section ul,
.section ol {
  padding-left: 1.25rem;
}
.section blockquote {
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  border-left: 4px solid var(--brand);
  background: var(--brand-soft);
  color: var(--text);
  border-radius: 0 0.9rem 0.9rem 0;
}
.section table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  overflow: hidden;
  display: block;
}
.section thead, .section tbody, .section tr {
  width: 100%;
  display: table;
  table-layout: fixed;
}
.section th, .section td {
  padding: 0.85rem 0.95rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.section th {
  color: var(--text);
  background: #f8fafc;
  font-size: 0.88rem;
}
.section td code {
  color: var(--text);
  background: #eef2f7;
  padding: 0.16rem 0.38rem;
  border-radius: 0.45rem;
}

.code-block,
.output-block {
  margin: 1rem 0 1.15rem;
  border: 1px solid var(--code-border);
  border-radius: 1rem;
  overflow: hidden;
  background: white;
}
.code-head,
.output-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0.95rem;
  background: #f8fafc;
  border-bottom: 1px solid var(--code-border);
}
.code-language,
.output-label {
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.copy-button {
  border: 1px solid var(--code-border);
  background: white;
  color: var(--muted);
  border-radius: 0.75rem;
  padding: 0.45rem 0.7rem;
  font-weight: 700;
  font-size: 0.84rem;
  cursor: pointer;
}
.copy-button.is-copied {
  color: var(--success);
  border-color: rgba(22, 101, 52, 0.25);
}
.copy-button.is-failed {
  color: #b91c1c;
  border-color: rgba(185, 28, 28, 0.25);
}
.code-block pre,
.output-block pre {
  margin: 0;
  padding: 1rem 1.05rem 1.1rem;
  overflow-x: auto;
  background: var(--code-bg);
}
.code-block code,
.output-block code {
  color: #24292f;
  white-space: pre;
  line-height: 1.65;
  font-size: 0.95rem;
}

.note {
  margin: 1rem 0;
  padding: 1rem 1rem 1rem 1.1rem;
  border-radius: 1rem;
  border: 1px solid var(--border);
  background: #fff;
}
.note h4 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}
.note p { margin: 0; }
.note.tip {
  background: #f0fdf4;
  border-color: rgba(22, 101, 52, 0.18);
}
.note.warn {
  background: #fff7ed;
  border-color: rgba(146, 64, 14, 0.18);
}

.footer {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}
.footer-inner {
  border-top: 1px solid var(--border);
  padding-top: 1.8rem;
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.footer-copy {
  color: var(--muted);
  max-width: 420px;
  line-height: 1.7;
}
.footer-links {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
}
.footer-column h4 {
  margin: 0 0 0.6rem;
  font-size: 0.9rem;
}
.footer-column a {
  display: block;
  margin-top: 0.45rem;
  color: var(--muted);
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }
  .topnav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding-top: 0.8rem;
  }
  .topnav.is-open { display: flex; }
  .topbar-inner { flex-wrap: wrap; }
  .docs-layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: static;
  }
  .outline-grid,
  .card-grid {
    grid-template-columns: 1fr;
  }
  .article {
    padding: 1.25rem;
  }
}

@media (max-width: 640px) {
  .page {
    padding: 1.1rem 1rem 2.5rem;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .brand img {
    width: 144px;
  }
}