:root{
  --bg:#ffffff; --frame:#f3f4f6; --card:#ffffff; --text:#0a0a0a; --body:#374151; --muted:#6b7280; --line:#e5e7eb;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0b0b0c; --frame:#161618; --card:#1e1e21; --text:#f4f4f5; --body:#d4d4d8; --muted:#a1a1aa; --line:#2c2c30;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0b0b0c; --frame:#161618; --card:#1e1e21; --text:#f4f4f5; --body:#d4d4d8; --muted:#a1a1aa; --line:#2c2c30;
  color-scheme:dark;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,sans-serif;font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:800px;margin:0 auto;padding:12px 16px 56px;display:flex;flex-direction:column;gap:20px}
.frame{background:var(--frame);border-radius:26px;padding:8px}
.card{background:var(--card);border-radius:18px;padding:40px}
.top{display:flex;justify-content:space-between;align-items:center;padding:12px 14px 12px 20px;border-radius:20px;font-size:14px;font-weight:500}
.top a{text-decoration:none}
.top .back{font-size:13px;background:var(--text);color:var(--bg);padding:8px 14px;border-radius:10px}
h1{font-size:30px;font-weight:500;letter-spacing:-.01em;line-height:1.2}
.date{color:var(--muted);font-size:14px;margin-top:6px}
.intro{margin-top:20px;color:var(--body)}
h2{font-size:18px;font-weight:500;margin:34px 0 8px;padding-top:26px;border-top:1px solid var(--line)}
h3{font-size:15px;font-weight:600;margin:18px 0 4px}
p,li{color:var(--body)}
p + p{margin-top:10px}
ul{margin:8px 0 0 20px;display:flex;flex-direction:column;gap:4px}
strong{color:var(--text);font-weight:600}
.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 16px;font-size:13px;color:var(--muted);padding:0 6px}
.foot nav{display:flex;gap:16px}
.foot a{text-decoration:none}
.foot a:hover{color:var(--text)}
@media (max-width:640px){
  .frame{padding:6px;border-radius:22px}
  .card{padding:26px 20px;border-radius:16px}
  h1{font-size:25px}
}