:root{--ink:#1a1f36;--ink-soft:#525c75;--accent:#635bff;--bg:#fff;--rule:#e6e8eb;--max:720px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.65;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
header{border-bottom:1px solid var(--rule);padding:18px 24px}
header .row{max-width:var(--max);margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:24px}
header a.brand{color:var(--ink);text-decoration:none;font-weight:600;font-size:18px;letter-spacing:-0.01em}
header a.brand:hover{color:var(--accent)}
header .lang{display:flex;gap:14px;font-size:14px}
header .lang a{color:var(--ink-soft);text-decoration:none}
header .lang a:hover{color:var(--ink)}
header .lang a.active{color:var(--accent);font-weight:600}
main{max-width:var(--max);margin:0 auto;padding:48px 24px 96px}
h1{font-size:32px;line-height:1.25;margin:0 0 12px;letter-spacing:-0.02em;font-weight:700}
.meta{color:var(--ink-soft);font-size:14px;margin:0 0 40px}
article h2{font-size:22px;margin:40px 0 12px;line-height:1.35;letter-spacing:-0.01em;font-weight:600}
article h3{font-size:18px;margin:28px 0 10px;line-height:1.4;font-weight:600}
article p{margin:0 0 16px;color:var(--ink)}
article ul,article ol{margin:0 0 16px;padding-left:24px}
article li{margin:6px 0}
article li>p{margin:0 0 8px}
article a{color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:2px}
article a:hover{text-decoration-thickness:2px}
article strong{font-weight:600;color:var(--ink)}
footer{border-top:1px solid var(--rule);padding:24px;color:var(--ink-soft);font-size:13px;text-align:center}
footer .row{max-width:var(--max);margin:0 auto}
@media (max-width:520px){h1{font-size:26px}article h2{font-size:19px}main{padding:32px 20px 64px}header{padding:14px 20px}}
@media (prefers-color-scheme:dark){:root{--ink:#e8eaf2;--ink-soft:#9aa3b7;--bg:#0e1320;--rule:#23293a;--accent:#a4a0ff}}