:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --accent: #0f3460;
  --primary: #e94560;
  --text: #eee;
  --muted: #999;
  --success: #4ade80;
  --warn: #fbbf24;
  --radius: 12px;
  --maxw: 760px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg); color: var(--text);
  min-height: 100vh; line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  border-bottom: 1px solid var(--accent);
  padding: 16px 24px;
  display: flex; gap: 24px; align-items: center; flex-wrap: wrap;
  max-width: var(--maxw); margin: 0 auto;
}
.nav .brand { font-weight: 700; color: var(--text); }
.nav .brand:hover { text-decoration: none; }
.nav .crumb { color: var(--muted); font-size: 0.9rem; }
.nav .crumb a { color: var(--muted); }
.nav .crumb a:hover { color: var(--text); }

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 24px 80px;
}
main h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin-bottom: 12px; letter-spacing: -0.5px;
}
main .lede {
  font-size: 1.05rem; color: var(--muted);
  margin-bottom: 32px;
}
main h2 {
  font-size: 1.3rem;
  margin: 36px 0 16px;
  color: var(--text);
}
main h3 {
  font-size: 1.05rem;
  margin: 24px 0 10px;
  color: var(--text);
}
main p { margin-bottom: 14px; }
main ol, main ul { margin: 0 0 16px 24px; }
main li { margin-bottom: 8px; }
main code {
  background: var(--surface);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--text);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.card {
  background: var(--surface);
  padding: 20px;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  display: flex; flex-direction: column; gap: 8px;
  border: 1px solid transparent;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover {
  border-color: var(--primary);
  text-decoration: none;
  transform: translateY(-2px);
}
.card .icon { font-size: 1.5rem; }
.card h3 { margin: 0; font-size: 1.05rem; }
.card p { color: var(--muted); font-size: 0.9rem; margin: 0; }

.note {
  background: var(--surface);
  border-left: 3px solid var(--accent);
  padding: 14px 16px;
  border-radius: 6px;
  margin: 16px 0;
  font-size: 0.95rem;
}
.note.tip { border-left-color: var(--success); }
.note.warn { border-left-color: var(--warn); }
.note strong { color: var(--text); }

.steps {
  counter-reset: step;
  list-style: none;
  margin-left: 0;
}
.steps li {
  counter-increment: step;
  padding-left: 44px;
  position: relative;
  margin-bottom: 16px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  width: 30px; height: 30px;
  background: var(--accent);
  color: var(--text);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: bold;
  font-size: 0.9rem;
}

.platform-tabs {
  display: flex;
  gap: 0;
  margin: 16px 0;
  border-bottom: 1px solid var(--accent);
}
.platform-tab {
  background: none;
  border: none;
  color: var(--muted);
  padding: 10px 18px;
  cursor: pointer;
  font-size: 0.95rem;
  border-bottom: 2px solid transparent;
}
.platform-tab.active {
  color: var(--text);
  border-bottom-color: var(--primary);
}

footer {
  border-top: 1px solid var(--accent);
  padding: 32px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}
footer a { color: var(--muted); margin: 0 8px; }
footer a:hover { color: var(--text); }