:root {
  --bg: #0a0a0a;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --text: #f5f5f5;
  --text-muted: #999;
  --accent: #007AFF;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}
.back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  text-decoration: none;
  font-size: 15px;
  margin-bottom: 32px;
}
.back:hover { text-decoration: underline; }
h1 {
  font-size: 36px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}
.meta {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0 0 40px;
}
h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 40px 0 12px;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
}
p, li {
  color: var(--text);
  margin: 0 0 12px;
}
ul, ol {
  padding-left: 24px;
  margin: 0 0 16px;
}
li { margin-bottom: 6px; }
a { color: var(--accent); }
strong { font-weight: 600; }
.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  border-radius: 6px;
  margin: 24px 0;
  font-size: 15px;
}
.callout p:last-child { margin-bottom: 0; }
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0 24px;
}
footer {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 24px;
}
footer a { color: var(--text-muted); margin: 0 12px; }