:root {
    --bg: #0A0C10;
    --surface: #0F1217;
    --text: #F4F6FA;
    --text-muted: #9AA3AF;
    --border: #2A3039;
    --accent: #4C82F0;
}
* { box-sizing: border-box; }
html, body {
    margin: 0; padding: 0;
    background: var(--bg); color: var(--text);
    font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Helvetica Neue",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 20px 64px; }
h1 { font-size: 24px; font-weight: 700; color: var(--text); margin: 24px 0 16px; }
h2 { font-size: 18px; font-weight: 600; color: var(--text); margin: 28px 0 12px; }
p, li { font-size: 15px; color: var(--text-muted); margin: 10px 0; }
strong { color: var(--text); font-weight: 600; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { padding-left: 22px; }
hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }