/* Kllix Docs — Geist design system (monochrome, 1px borders, 6/8px radius) */
:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-hover: #f2f2f2;
  --line: #eaeaea;
  --line-hover: #d4d4d4;
  --fg: #000000;
  --fg-2: #666666;
  --fg-3: #8f8f8f;
  --info: #0070f3;
  --success: #0e9f6e;
  --warning: #f5a623;
  --radius-sm: 4px;
  --radius: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --ease: cubic-bezier(0.175, 0.885, 0.32, 1.1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'Geist Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --header-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 24px); }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; }
::selection { background: #000; color: #fff; }

/* ─── Header ─────────────────────────────────────────── */
.docs-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1400px; height: 100%; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.logo-link { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-img { height: 20px; width: auto; display: block; }
.logo-sep { color: var(--line-hover); font-size: 20px; font-weight: 300; }
.logo-text { font-size: 14px; font-weight: 500; color: var(--fg-2); }
.header-nav { display: flex; align-items: center; gap: 4px; }
.header-nav a {
  font-size: 14px; color: var(--fg-2); text-decoration: none;
  padding: 6px 10px; border-radius: var(--radius);
  transition: color 150ms var(--ease), background 150ms var(--ease);
}
.header-nav a:hover { color: var(--fg); background: var(--surface-hover); }
.header-nav .btn-start {
  margin-inline-start: 8px; color: #fff; background: #000; font-weight: 500;
  border: 1px solid #000;
}
.header-nav .btn-start:hover { background: #333; color: #fff; }
.menu-toggle {
  display: none; border: 1px solid var(--line); background: var(--surface);
  border-radius: var(--radius); width: 36px; height: 36px; cursor: pointer; font-size: 16px;
}

/* ─── Layout ─────────────────────────────────────────── */
.docs-layout {
  max-width: 1400px; margin: 0 auto;
  display: grid; grid-template-columns: 260px minmax(0, 1fr) 220px;
}
.docs-sidebar {
  position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h)); overflow-y: auto;
  border-inline-end: 1px solid var(--line);
}
.sidebar-inner { padding: 24px 16px 48px; }
.docs-home-link {
  display: block; font-size: 13px; font-weight: 600; text-decoration: none;
  padding: 6px 10px; margin-bottom: 16px;
}
.nav-group { margin-bottom: 20px; }
.nav-section {
  margin: 0 0 6px; padding: 0 10px;
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.06em; color: var(--fg-3);
}
.nav-group ul { list-style: none; margin: 0; padding: 0; }
.nav-group a {
  display: block; padding: 6px 10px; border-radius: var(--radius);
  font-size: 14px; color: var(--fg-2); text-decoration: none;
  transition: color 150ms var(--ease), background 150ms var(--ease);
}
.nav-group a:hover { color: var(--fg); background: var(--surface-hover); }
.nav-group a.active { color: var(--fg); background: var(--surface-hover); font-weight: 500; }

.docs-main { padding: 40px 56px 80px; min-width: 0; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--fg-3); margin-bottom: 24px; }
.breadcrumb a { color: var(--fg-2); text-decoration: none; }
.breadcrumb a:hover { color: var(--fg); }

.docs-toc { position: sticky; top: var(--header-h); height: calc(100vh - var(--header-h)); overflow-y: auto; padding: 40px 16px; }
.toc-title { margin: 0 0 10px; font-size: 13px; font-weight: 600; }
.toc ul { list-style: none; margin: 0; padding: 0; border-inline-start: 1px solid var(--line); }
.toc li a {
  display: block; padding: 4px 12px; margin-inline-start: -1px;
  font-size: 13px; color: var(--fg-3); text-decoration: none;
  border-inline-start: 1px solid transparent;
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}
.toc li.toc-sub a { padding-inline-start: 24px; }
.toc li a:hover { color: var(--fg); }
.toc li a.active { color: var(--fg); border-inline-start-color: var(--fg); }

/* ─── Content ────────────────────────────────────────── */
.doc-content { max-width: 760px; }
.doc-content h1 { font-size: 40px; line-height: 1.15; letter-spacing: -0.04em; font-weight: 700; margin: 0 0 16px; }
.doc-content h2 { font-size: 24px; letter-spacing: -0.02em; font-weight: 600; margin: 48px 0 12px; padding-top: 24px; border-top: 1px solid var(--line); }
.doc-content h3 { font-size: 18px; letter-spacing: -0.01em; font-weight: 600; margin: 32px 0 8px; }
.doc-content p { margin: 0 0 16px; color: #333; }
.doc-content h1 + p { font-size: 18px; color: var(--fg-2); }
.doc-content ul, .doc-content ol { padding-inline-start: 22px; margin: 0 0 16px; color: #333; }
.doc-content li { margin: 4px 0; }
.doc-content li::marker { color: var(--fg-3); }
.doc-content a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--line-hover); }
.doc-content a:hover { text-decoration-color: var(--fg); }
.doc-content strong { font-weight: 600; color: var(--fg); }
.doc-content hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
.inline-code {
  font-family: var(--mono); font-size: 0.86em;
  padding: 2px 6px; border-radius: var(--radius-sm);
  background: var(--surface-hover); border: 1px solid var(--line);
}
.code-block {
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
  background: #0a0a0a; color: #ededed;
  padding: 16px 20px; border-radius: var(--radius-lg); overflow-x: auto; margin: 0 0 20px;
}
blockquote {
  margin: 0 0 20px; padding: 12px 16px;
  border: 1px solid var(--line); border-inline-start: 3px solid var(--info);
  border-radius: var(--radius); background: var(--bg); color: #333; font-size: 14px;
}
.table-wrap { overflow-x: auto; margin: 0 0 20px; border: 1px solid var(--line); border-radius: var(--radius-lg); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: start; font-weight: 500; color: var(--fg-2); background: var(--bg); }
th, td { padding: 10px 14px; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: 0; }

.page-nav { max-width: 760px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 56px; }
.nav-btn {
  display: flex; flex-direction: column; gap: 2px;
  padding: 16px; border: 1px solid var(--line); border-radius: var(--radius-lg);
  text-decoration: none; font-weight: 500; font-size: 15px;
  transition: border-color 150ms var(--ease), box-shadow 150ms var(--ease);
}
.nav-btn small { font-size: 12px; font-weight: 400; color: var(--fg-3); }
.nav-btn:hover { border-color: var(--line-hover); box-shadow: var(--shadow-md); }
.nav-btn.next { text-align: end; grid-column: 2; }

/* ─── Index ──────────────────────────────────────────── */
.docs-index-main { max-width: 1100px; margin: 0 auto; padding: 80px 24px 96px; }
.index-hero { max-width: 680px; margin-bottom: 56px; }
.eyebrow {
  font-family: var(--mono); font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--fg-3); margin: 0 0 12px;
}
.index-hero h1 { font-size: 48px; line-height: 1.1; letter-spacing: -0.045em; margin: 0 0 16px; }
.index-hero p { font-size: 18px; color: var(--fg-2); margin: 0 0 28px; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 6px; height: 40px; padding: 0 16px;
  background: #000; color: #fff; border-radius: var(--radius);
  font-size: 14px; font-weight: 500; text-decoration: none;
  transition: background 150ms var(--ease);
}
.btn-primary:hover { background: #333; }
.index-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  border-top: 1px solid var(--line); border-inline-start: 1px solid var(--line);
  border-radius: var(--radius-lg); overflow: hidden;
}
.index-card {
  display: block; padding: 24px; text-decoration: none; background: var(--surface);
  border-inline-end: 1px solid var(--line); border-bottom: 1px solid var(--line);
  transition: background 150ms var(--ease);
}
.index-card:hover { background: var(--bg); }
.index-num { font-family: var(--mono); font-size: 12px; color: var(--fg-3); }
.index-card h2 { font-size: 16px; font-weight: 600; margin: 12px 0 6px; letter-spacing: -0.01em; }
.index-card p { font-size: 14px; color: var(--fg-2); margin: 0; line-height: 1.6; }

/* ─── Footer / 404 ───────────────────────────────────── */
.docs-footer { border-top: 1px solid var(--line); background: var(--bg); }
.footer-inner {
  max-width: 1400px; margin: 0 auto; padding: 24px;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  font-size: 13px; color: var(--fg-2);
}
.footer-inner p { margin: 0; }
.footer-inner nav { display: flex; gap: 16px; }
.footer-inner a { text-decoration: none; color: var(--fg-2); }
.footer-inner a:hover { color: var(--fg); }
.error-page { max-width: 560px; margin: 0 auto; padding: 120px 24px; text-align: center; }
.error-code { font-family: var(--mono); color: var(--fg-3); margin: 0 0 8px; }
.error-page h1 { font-size: 32px; letter-spacing: -0.03em; margin: 0 0 12px; }
.error-page p { color: var(--fg-2); margin: 0 0 28px; }

/* ─── Responsive ─────────────────────────────────────── */
@media (max-width: 1200px) {
  .docs-layout { grid-template-columns: 240px minmax(0, 1fr); }
  .docs-toc { display: none; }
}
@media (max-width: 860px) {
  .docs-layout { grid-template-columns: 1fr; }
  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .header-nav a:not(.btn-start) { display: none; }
  .docs-sidebar {
    position: fixed; inset: var(--header-h) auto 0 0; width: 280px; z-index: 40;
    background: var(--surface); transform: translateX(-100%);
    transition: transform 200ms var(--ease); box-shadow: var(--shadow-md);
  }
  .docs-sidebar.open { transform: translateX(0); }
  .docs-main { padding: 28px 20px 64px; }
  .doc-content h1, .index-hero h1 { font-size: 32px; }
  .page-nav { grid-template-columns: 1fr; }
  .nav-btn.next { grid-column: auto; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}