:root {
  --bg: #0b0d12;
  --bg-elev: #11141b;
  --bg-code: #0a0c11;
  --border: #1f2430;
  --border-strong: #2a3142;
  --fg: #e7ebf3;
  --fg-muted: #98a2b3;
  --fg-dim: #6b7280;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --accent-2: #c4b5fd;
  --warn: #fbbf24;
  --danger: #f87171;
  --ok: #34d399;
  --radius: 12px;
  --radius-sm: 8px;
  --max-w: 1180px;
  --content-w: 760px;
  --sidebar-w: 260px;
  --toc-w: 220px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted transparent;
  transition: border-color .15s ease, color .15s ease;
}
a:hover { color: var(--accent-strong); border-bottom-color: currentColor; }

code, pre { font-family: var(--mono); font-size: 0.92em; }

p code, li code, td code, h1 code, h2 code, h3 code, h4 code {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 0.08em 0.4em;
  border-radius: 5px;
  font-size: 0.88em;
  color: #f1d29b;
  white-space: nowrap;
}

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  margin: 18px 0;
  line-height: 1.6;
}
pre code { background: transparent; border: 0; padding: 0; color: var(--fg); white-space: pre; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11,13,18,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--fg);
  font-size: 15px;
  border: 0;
}
.brand:hover { color: var(--accent); border: 0; }
.brand .dot { color: var(--accent); }
.nav { margin-left: auto; display: flex; gap: 18px; font-size: 14px; }
.nav a { color: var(--fg-muted); border: 0; }
.nav a:hover { color: var(--fg); }

/* Hero / landing */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 64px 24px 24px;
}
.hero h1 {
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.25;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.hero .lead {
  color: var(--fg-muted);
  font-size: 17px;
  max-width: 640px;
}

/* Topic grid (top page) */
.topics {
  max-width: var(--max-w);
  margin: 24px auto 80px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}
.topic-card {
  display: block;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px 20px;
  border-bottom: 1px solid var(--border);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.topic-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: #131722;
  border-bottom-color: var(--border-strong);
  color: var(--fg);
}
.topic-card .tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(56,189,248,0.08);
  padding: 3px 8px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.topic-card h3 { margin: 0 0 8px; font-size: 18px; color: var(--fg); }
.topic-card p { margin: 0; color: var(--fg-muted); font-size: 14px; line-height: 1.7; }
.topic-card.coming { opacity: 0.55; pointer-events: none; }
.topic-card.coming .tag { color: var(--fg-dim); background: rgba(255,255,255,0.04); }

/* Doc layout (sidebar + main) */
.doc-shell {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 28px 24px 80px;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}
.sidebar {
  position: sticky;
  top: 72px;
  max-height: calc(100vh - 92px);
  overflow-y: auto;
  padding-right: 8px;
  font-size: 14px;
}
.sidebar-section {
  margin-bottom: 18px;
}
.sidebar-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-dim);
  padding: 4px 10px;
  margin: 8px 0 4px;
}
.sidebar a {
  display: block;
  padding: 7px 10px;
  border-radius: 6px;
  color: var(--fg-muted);
  border: 0;
  line-height: 1.4;
}
.sidebar a:hover { background: var(--bg-elev); color: var(--fg); }
.sidebar a.current {
  background: rgba(56,189,248,0.08);
  color: var(--accent);
  font-weight: 500;
}

.doc-main { min-width: 0; }
.doc-main h1 {
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1.25;
  margin: 0 0 8px;
  letter-spacing: -0.005em;
}
.doc-main .doc-lead {
  color: var(--fg-muted);
  margin: 0 0 28px;
  font-size: 16px;
}
.doc-main h2 {
  font-size: 22px;
  margin: 44px 0 12px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  padding-top: 28px;
}
.doc-main h2:first-of-type { border-top: 0; padding-top: 0; }
.doc-main h3 { font-size: 17px; margin: 28px 0 10px; color: var(--fg); }
.doc-main h4 { font-size: 15px; margin: 22px 0 8px; color: var(--accent); }
.doc-main p { margin: 12px 0; }
.doc-main ul, .doc-main ol { padding-left: 1.4em; }
.doc-main li { margin: 4px 0; }
.doc-main hr { border: 0; border-top: 1px solid var(--border); margin: 36px 0; }

/* Callouts */
.callout {
  border: 1px solid var(--border);
  border-left-width: 3px;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 18px 0;
  background: var(--bg-elev);
  font-size: 14.5px;
}
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.callout-title {
  font-weight: 600;
  margin-bottom: 4px;
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; letter-spacing: 0.04em; text-transform: uppercase;
}
.callout.note { border-left-color: var(--accent); }
.callout.note .callout-title { color: var(--accent); }
.callout.warn { border-left-color: var(--warn); }
.callout.warn .callout-title { color: var(--warn); }
.callout.danger { border-left-color: var(--danger); }
.callout.danger .callout-title { color: var(--danger); }
.callout.tip { border-left-color: var(--ok); }
.callout.tip .callout-title { color: var(--ok); }

/* Tables */
.doc-main table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
  margin: 18px 0;
}
.doc-main th, .doc-main td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
.doc-main th { background: var(--bg-elev); font-weight: 600; }

/* Footer / pager */
.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.pager a {
  flex: 1;
  display: block;
  padding: 14px 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  border-bottom: 1px solid var(--border);
}
.pager a:hover { border-color: var(--accent); border-bottom-color: var(--accent); color: var(--fg); }
.pager .next { text-align: right; }
.pager small {
  display: block;
  color: var(--fg-dim);
  font-size: 12px;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  padding: 28px 24px;
  color: var(--fg-dim);
  font-size: 13px;
  text-align: center;
}

/* Code title bar */
.code-block { position: relative; margin: 18px 0; }
.code-block .code-title {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-dim);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-bottom: 0;
  padding: 6px 12px;
  border-radius: var(--radius) var(--radius) 0 0;
}
.code-block .code-title + pre {
  margin: 0;
  border-radius: 0 0 var(--radius) var(--radius);
}

/* Inline kbd */
kbd {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 5px;
  color: var(--fg);
}

/* Mobile */
@media (max-width: 900px) {
  .doc-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    max-height: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    margin-bottom: 18px;
    background: var(--bg-elev);
  }
  .pager { flex-direction: column; }
}

/* Prism overrides (subtle) */
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: #6b7280; font-style: italic; }
.token.punctuation { color: #94a3b8; }
.token.property, .token.tag, .token.boolean, .token.number, .token.constant, .token.symbol { color: #f0a8a8; }
.token.selector, .token.attr-name, .token.string, .token.char, .token.builtin { color: #a7d8a4; }
.token.operator, .token.entity, .token.url, .language-css .token.string, .style .token.string { color: #c4b5fd; }
.token.atrule, .token.attr-value, .token.keyword { color: #7dd3fc; }
.token.function, .token.class-name { color: #fbbf24; }
.token.regex, .token.important, .token.variable { color: #fda4af; }