:root{--bg:#F4F6F7;--surface:#FFFFFF;--ink:#1A1F23;--ink2:#5B656D;--line:#D9DEE2;--accent:#1F5FD1;color-scheme:light}
@media (prefers-color-scheme: dark){:root{--bg:#121517;--surface:#1B1F22;--ink:#E6EAED;--ink2:#9AA4AC;--line:#30373C;--accent:#5B8DEF;color-scheme:dark}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,"Apple SD Gothic Neo","Hiragino Sans","Noto Sans KR","Noto Sans JP","Malgun Gothic",sans-serif;line-height:1.7}
main{max-width:720px;margin:0 auto;padding:40px 20px 80px}
h1{font-size:28px;line-height:1.3;margin:0 0 6px}
h2{font-size:19px;margin:36px 0 8px}
p,li{color:var(--ink);font-size:16px}
.muted{color:var(--ink2);font-size:14px}
a{color:var(--accent)}
.tabs{display:flex;gap:8px;margin:20px 0 8px}
.tabs a{padding:6px 14px;border:1px solid var(--line);border-radius:999px;text-decoration:none;color:var(--ink2);font-size:14px}
.tabs a.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.lang{display:none}.lang.on{display:block}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin:14px 0}
.card h3{margin:0 0 4px;font-size:18px}