:root{color-scheme:light dark;--bg:#EEF6FC;--card:#FFFFFF;--ink:#0F2236;--sub:#52677B;--line:#CFE0EE;--accent:#1B7FD9;--link:#0F63B5}
@media (prefers-color-scheme:dark){:root{--bg:#0B1620;--card:#122231;--ink:#EAF3FB;--sub:#9DB3C6;--line:#223A50;--accent:#4DA6F5;--link:#7CBEF8}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.7 -apple-system,BlinkMacSystemFont,"Hiragino Sans","Apple SD Gothic Neo",system-ui,sans-serif;overflow-wrap:break-word}
main{max-width:720px;margin:0 auto;padding:40px 16px 80px}
.sign{display:inline-block;color:var(--ink);border-bottom:4px solid var(--accent);padding:2px 0;font-weight:800;font-size:20px;text-decoration:none}
h1{font-size:30px;line-height:1.2;margin:.6em 0 .3em;font-weight:800}
h2{font-size:20px;margin:2em 0 .4em;padding-left:10px;border-left:4px solid var(--accent)}
a{color:var(--link)}
.meta{color:var(--sub);font-size:15px}
.lang a{margin-right:12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:16px 0}
.card h2{margin-top:0}
hr{border:0;border-top:1px solid var(--line);margin:56px 0}
ul{padding-left:1.2em}li{margin:.3em 0}
footer{color:var(--sub);font-size:14px;text-align:center;margin-top:48px}