:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #0f766e;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.container {
  max-width: 860px;
  margin: 32px auto;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
}
h1, h2 { line-height: 1.25; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.note { color: var(--muted); font-size: 0.95rem; }
ul { padding-left: 20px; }
@media (max-width: 640px) {
  .container { margin: 12px; padding: 16px; }
}