:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1a1a2e;
  --muted: #6b7280;
  --accent: #4f46e5;
  --border: #e5e7eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --card: #1a1d29;
    --text: #f5f6f8;
    --muted: #9ca3af;
    --accent: #818cf8;
    --border: #2a2f3d;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 24px 16px;
}

.doc {
  max-width: 760px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px clamp(20px, 5vw, 48px);
}

.back {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}
.back img { border-radius: 8px; }

h1 { font-size: 28px; margin: 24px 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
h3 { font-size: 16px; margin: 20px 0 6px; }
.meta { color: var(--muted); font-size: 14px; margin-top: 0; }
a { color: var(--accent); }
ul { padding-left: 20px; }
li { margin-bottom: 6px; }

table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }