:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --heading: #f0f6fc;
  --accent: #58a6ff;
  --accent-dim: #1f6feb;
  --green: #3fb950;
  --orange: #d29922;
  --red: #f85149;
  --purple: #bc8cff;
  --mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'JetBrains Mono', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--sans); background: var(--bg); color: var(--text); line-height: 1.6; }
.container { max-width: 900px; margin: 0 auto; padding: 0 1.5rem; }
h1, h2, h3, h4 { color: var(--heading); font-weight: 600; }
h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }
h2 { font-size: 1.5rem; margin-top: 3rem; margin-bottom: 1rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
h3 { font-size: 1.1rem; margin-top: 1.5rem; margin-bottom: 0.5rem; }
h4 { font-size: 0.95rem; margin-top: 1.2rem; margin-bottom: 0.4rem; color: var(--accent); }
p { margin-bottom: 1rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); background: var(--surface); padding: 0.15em 0.4em; border-radius: 4px; font-size: 0.9em; }
pre { font-family: var(--mono); background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1.2rem; overflow-x: auto; font-size: 0.82rem; line-height: 1.5; margin-bottom: 1.5rem; }
pre code { background: none; padding: 0; }
strong { color: var(--heading); }
ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.3rem; }
/* Nav */
nav { position: sticky; top: 0; background: var(--bg); border-bottom: 1px solid var(--border); z-index: 100; padding: 0.6rem 0; }
nav .container { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
nav .logo { font-weight: 700; color: var(--heading); font-size: 1rem; white-space: nowrap; text-decoration: none; }
nav .logo span { color: var(--accent); }
nav a { color: var(--text-muted); font-size: 0.85rem; }
nav a:hover { color: var(--heading); text-decoration: none; }
nav a.active { color: var(--accent); }
/* Hero */
.hero { text-align: center; padding: 3rem 0 2rem; }
.hero .version { display: inline-block; background: var(--accent-dim); color: var(--heading); padding: 0.2em 0.7em; border-radius: 12px; font-size: 0.8rem; font-family: var(--mono); margin-bottom: 1rem; }
.hero .tagline { color: var(--text-muted); font-size: 1.15rem; max-width: 600px; margin: 0.5rem auto 2rem; }
.install-box { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.5rem; display: inline-block; font-family: var(--mono); font-size: 0.95rem; margin-bottom: 0.5rem; }
.install-box .prompt { color: var(--green); }
.install-box .cmd { color: var(--heading); }
/* Grid, Card */
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.5rem 0; }
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1.2rem; }
.card h3 { margin-top: 0; color: var(--accent); font-size: 1rem; }
.card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 0; }
/* Skill table */
.skill-table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.skill-table th { text-align: left; color: var(--text-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; padding: 0.5rem 0; border-bottom: 1px solid var(--border); }
.skill-table td { padding: 0.6rem 0; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.skill-table td:first-child { font-family: var(--mono); color: var(--accent); white-space: nowrap; padding-right: 1.5rem; }
/* Phase pipeline */
.phase { display: flex; align-items: center; gap: 0.5rem; padding: 0.4rem 0; }
.phase-num { background: var(--accent-dim); color: var(--heading); width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 600; flex-shrink: 0; }
.phase-label { font-weight: 600; color: var(--heading); }
.phase-arrow { color: var(--border); font-size: 1.2rem; margin: 0 0.2rem; }
/* Compare grid */
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin: 1rem 0; }
@media (max-width: 600px) { .compare-grid { grid-template-columns: 1fr; } }
.compare-item h3 { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 0.3rem; }
.compare-item p { font-size: 0.9rem; }
/* Concepts */
.concepts dt { color: var(--accent); font-weight: 600; font-size: 0.95rem; margin-top: 0.8rem; }
.concepts dd { color: var(--text-muted); margin-left: 0; margin-bottom: 0.5rem; font-size: 0.9rem; }
/* Walkthrough */
.wt-phase { border-left: 3px solid var(--accent-dim); padding-left: 1.2rem; margin: 1.5rem 0; }
.wt-phase.pause { border-left-color: var(--orange); }
.wt-label { font-family: var(--mono); font-size: 0.75rem; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.3rem; }
.wt-phase.pause .wt-label { color: var(--orange); }
.wt-persona { color: var(--purple); font-weight: 600; }
.wt-user { color: var(--green); font-weight: 600; }
.wt-muted { color: var(--text-muted); }
/* Complexity table */
.ciu-table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9rem; }
.ciu-table th { text-align: left; color: var(--text-muted); font-size: 0.8rem; padding: 0.4rem 0.8rem 0.4rem 0; border-bottom: 1px solid var(--border); }
.ciu-table td { padding: 0.4rem 0.8rem 0.4rem 0; border-bottom: 1px solid var(--border); }
.ciu-table td:first-child { font-family: var(--mono); color: var(--accent); }
/* Footer */
.footer { margin-top: 4rem; padding: 2rem 0; border-top: 1px solid var(--border); color: var(--text-muted); font-size: 0.85rem; text-align: center; }