:root {
  --bg: #0b1020;
  --panel: #161b2e;
  --text: #e6e8f0;
  --muted: #9aa3b2;
  --accent: #5aa9ff;
  --border: #2a3150;
  --kbd-bg: #0f1730;
  --info-bg: #0e223a;
  --info-border: #2b79c2;
  --tip-bg: #0f2a1d;
  --tip-border: #2baf6b;
  --warn-bg: #2a2210;
  --warn-border: #c28a2b;
}

/* Light theme */
:root[data-theme="light"] {
  --bg: #ffffff;
  --panel: #f6f7fb;
  --text: #131722;
  --muted: #5b6472;
  --accent: #0b6bcb;
  --border: #e2e6f0;
  --kbd-bg: #eef1f6;
  --info-bg: #e9f3ff;
  --info-border: #2b79c2;
  --tip-bg: #e9fff3;
  --tip-border: #2baf6b;
  --warn-bg: #fff5e6;
  --warn-border: #c28a2b;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
}

.nav {
  width: 280px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 20px 14px;
  overflow: auto;
}
.nav.collapsed { width: 0; padding: 0; border-right: none; overflow: hidden; }
.nav.collapsed * { display: none; }
.nav h1 {
  font-size: 19px;
  margin: 0 0 16px 8px;
}
.nav .brand { color: var(--accent); font-weight: 600; }
.nav .muted { color: var(--muted); font-size: 12px; margin: 18px 8px 8px; letter-spacing: .02em; text-transform: uppercase; }
.nav input[type="search"] {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #10162b;
  color: var(--text);
  margin-bottom: 10px;
}
:root[data-theme="light"] .nav input[type="search"] { background: #ffffff; }
.nav a {
  display: block;
  color: var(--text);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 6px;
  margin: 2px 0;
}
.nav a:hover { background: #20274433; }
.nav a:visited { color: var(--text); }

.main { flex: 1; overflow: auto; }
.header {
  position: sticky; top: 0;
  background: linear-gradient(90deg, rgba(11,16,32,.9), rgba(11,16,32,.7));
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex; gap: 16px; align-items: center;
  z-index: 100;
}
:root[data-theme="light"] .header { background: linear-gradient(90deg, rgba(255,255,255,.9), rgba(255,255,255,.7)); }
.header .badge { border: 1px solid var(--border); padding: 2px 6px; border-radius: 6px; color: var(--muted); font-size: 12px; }
.header .spacer { flex: 1; }
.header .toggle { display:inline-flex; align-items:center; gap:8px; font-size:12px; color: var(--muted); }
.header .toggle button { cursor:pointer; border:1px solid var(--border); background:var(--panel); color:var(--text); padding:6px 10px; border-radius:8px; }
.header .toggle .ghost { background: transparent; }
.header .toggle button:hover { filter: brightness(1.05); }

.content { padding: 24px; max-width: 980px; }
.content h2 { margin-top: 36px; border-bottom: 2px solid var(--accent); padding-bottom: 8px; letter-spacing: .2px; }
.content h3 { margin-top: 20px; color: var(--muted); }
.content p { line-height: 1.7; }
.content ul { line-height: 1.6; }
.content pre {
  background: #10162b;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  overflow: auto;
  position: relative;
}
:root[data-theme="light"] .content pre { background: #f7f9fc; }
code, pre { color: #bfe9ff; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; font-size: 13px; }
:root[data-theme="light"] code,
:root[data-theme="light"] pre { color: #0f172a; }
.content a { color: var(--accent); }
.content a:visited { color: #8dc7ff; }
:root[data-theme="light"] .content a:visited { color: #0b6bcb; }

/* Copy button for code blocks */
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 12px;
  cursor: pointer;
}
.copy-btn:hover { background: #20274433; }

/* Focus states for accessibility */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.small { font-size: 12px; color: var(--muted); }

/* Anchor offset for sticky header */
.anchor { scroll-margin-top: 64px; }

/* Callouts */
.callout { border:1px solid; border-radius:10px; padding:12px 14px; margin:14px 0; }
.callout .title { font-weight:600; margin-bottom:6px; }
.callout.info { background: var(--info-bg); border-color: var(--info-border); }
.callout.tip { background: var(--tip-bg); border-color: var(--tip-border); }
.callout.warn { background: var(--warn-bg); border-color: var(--warn-border); }

/* Mermaid diagrams container: force readable background */
.content .mermaid {
  background: #ffffff;
  color: #111111;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin: 12px 0;
  overflow: auto;
}
:root[data-theme="light"] .content .mermaid { background: #ffffff; color: #111111; }