*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sidebar-bg: #0f1117;
  --sidebar-width: 240px;
  --accent: #6c8ebf;
  --accent-light: #e8f0fc;
  --text: #1a1d23;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --code-bg: #f3f4f6;
  --code-block-bg: #1e2230;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
}

body {
  font-family: var(--font);
  color: var(--text);
  background: #fff;
  display: flex;
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.6;
}

/* ── Sidebar ──────────────────────────────────────────────── */
nav.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  position: fixed;
  top: 0; left: 0; bottom: 0;
  overflow-y: auto;
  padding: 28px 0 40px;
  display: flex;
  flex-direction: column;
}

.sidebar .logo {
  padding: 0 20px 24px;
  border-bottom: 1px solid #ffffff18;
  margin-bottom: 16px;
}

.sidebar .logo a {
  color: #fff;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar .logo .tag {
  font-size: 10px;
  font-weight: 500;
  background: #ffffff22;
  color: #ffffffaa;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.sidebar-section {
  margin-bottom: 4px;
}

.sidebar-section-label {
  color: #ffffff44;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 8px 20px 4px;
}

.sidebar a {
  display: block;
  padding: 7px 20px;
  color: #ffffffaa;
  text-decoration: none;
  font-size: 13.5px;
  transition: color 0.15s, background 0.15s;
  border-left: 2px solid transparent;
}

.sidebar a:hover {
  color: #fff;
  background: #ffffff0a;
}

.sidebar a.active {
  color: #fff;
  border-left-color: var(--accent);
  background: #ffffff10;
}

/* ── Main content ─────────────────────────────────────────── */
main {
  margin-left: var(--sidebar-width);
  flex: 1;
  max-width: 860px;
  padding: 52px 64px 80px;
}

.page-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.page-header .eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

h1 { font-size: 28px; font-weight: 700; line-height: 1.25; color: var(--text); }
h2 { font-size: 20px; font-weight: 600; margin-top: 40px; margin-bottom: 12px; color: var(--text); }
h3 { font-size: 15px; font-weight: 600; margin-top: 28px; margin-bottom: 8px; color: var(--text); }

p { margin-bottom: 14px; }
p:last-child { margin-bottom: 0; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

ul, ol { padding-left: 20px; margin-bottom: 14px; }
li { margin-bottom: 4px; }
li > ul, li > ol { margin-top: 4px; margin-bottom: 4px; }

strong { font-weight: 600; }

/* ── Code ─────────────────────────────────────────────────── */
code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 4px;
  color: #c94f7c;
}

pre {
  background: var(--code-block-bg);
  border-radius: 8px;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 16px 0;
}

pre code {
  background: none;
  color: #cdd6f4;
  font-size: 13px;
  padding: 0;
  line-height: 1.65;
}

/* ── Callouts ─────────────────────────────────────────────── */
.callout {
  border-radius: 8px;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 14px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.callout .icon { flex-shrink: 0; margin-top: 1px; }

.callout.info { background: #eff6ff; border-left: 3px solid #3b82f6; }
.callout.tip  { background: #f0fdf4; border-left: 3px solid #22c55e; }
.callout.warn { background: #fffbeb; border-left: 3px solid #f59e0b; }

/* ── Step list ────────────────────────────────────────────── */
.steps { counter-reset: step; list-style: none; padding: 0; margin: 20px 0; }

.steps li {
  counter-increment: step;
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.steps li::before {
  content: counter(step);
  flex-shrink: 0;
  width: 26px; height: 26px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  margin-top: 1px;
}

.steps li .step-content { flex: 1; }
.steps li .step-content strong { display: block; margin-bottom: 4px; }

/* ── Table ────────────────────────────────────────────────── */
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
th { text-align: left; font-weight: 600; padding: 8px 12px; background: #f9fafb; border-bottom: 2px solid var(--border); }
td { padding: 8px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
tr:last-child td { border-bottom: none; }

/* ── Diagram ──────────────────────────────────────────────── */
.diagram {
  background: var(--code-block-bg);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 16px 0;
  font-family: var(--mono);
  font-size: 13px;
  color: #cdd6f4;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
}

/* ── Next/prev nav ────────────────────────────────────────── */
.page-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 52px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  gap: 12px;
}

.page-nav a {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  max-width: 220px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.page-nav a:hover { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); text-decoration: none; }

.page-nav .nav-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.page-nav .nav-title { font-size: 14px; font-weight: 500; color: var(--text); }
.page-nav .prev { text-align: left; }
.page-nav .next { text-align: right; margin-left: auto; }

@media (max-width: 768px) {
  nav.sidebar { display: none; }
  main { margin-left: 0; padding: 32px 24px 60px; }
}