:root {
  --bg: #07080A;
  --bg-element: #0F1115;
  --border: #1E222B;
  --text: #F8FAFC;
  --text-secondary: #94A3B8;
  --primary: #10B981;
  --primary-bright: #34D399;
  --max-w: 760px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* Header / brand */
header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 44px;
}
.brand-mark { width: 36px; height: 36px; border-radius: 10px; box-shadow: 0 4px 18px rgba(16,185,129,0.22); }
.brand-name { font-size: 18px; font-weight: 700; letter-spacing: -0.02em; }
header a { margin-left: auto; color: var(--text-secondary); text-decoration: none; font-size: 14px; font-weight: 600; }
header a:hover { color: var(--primary-bright); }

/* Document */
.doc h1 {
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 10px;
}
.doc .updated {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 12px;
}
.doc .intro {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 40px;
}
.doc h2 {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
  scroll-margin-top: 24px;
}
.doc h3 { font-size: 17px; font-weight: 700; margin: 24px 0 8px; }
.doc p { margin-bottom: 14px; color: #E2E8F0; }
.doc ul { margin: 0 0 16px 22px; }
.doc li { margin-bottom: 8px; color: #E2E8F0; }
.doc a { color: var(--primary-bright); text-decoration: none; }
.doc a:hover { text-decoration: underline; }
.doc strong { color: var(--text); }

.callout {
  background: rgba(16,185,129,0.06);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: 10px;
  padding: 16px 18px;
  margin: 24px 0;
  font-size: 15px;
  color: var(--text-secondary);
}

footer {
  border-top: 1px solid var(--border);
  padding: 32px 0 0;
  margin-top: 56px;
  color: var(--text-secondary);
  font-size: 14px;
  text-align: center;
}
footer a { color: var(--text-secondary); text-decoration: none; margin: 0 10px; }
footer a:hover { color: var(--primary-bright); }