:root{
  --bg:#fbfaf7; --fg:#22252b; --muted:#6b6f78; --line:#e6e2da; --card:#ffffff;
  --accent:#1f5fa8; --accent-soft:#e7eef8; --tag:#f1ede6; --code:#f4f1ea;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Noto Sans SC","Source Han Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#14161a; --fg:#e4e2dc; --muted:#9a9ea7; --line:#2a2e35; --card:#1b1e23;
    --accent:#7fb2ec; --accent-soft:#1f2b3a; --tag:#24282f; --code:#22262c; }
  .figure svg{ filter:brightness(.92); }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:17px;line-height:1.85;letter-spacing:.01em}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
.wrap{max-width:760px;margin:0 auto;padding:0 22px}
.site-header{border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:5}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{display:flex;align-items:center;gap:10px;color:var(--fg);font-family:var(--serif);font-size:21px;font-weight:700;letter-spacing:.08em}
.brand:hover{text-decoration:none}
.brand .dot{width:14px;height:14px;border-radius:50%;background:radial-gradient(circle at 40% 40%,#f6d27d,#e0a83c);box-shadow:0 0 0 4px var(--accent-soft)}
.nav a{color:var(--muted);margin-left:22px;font-size:15px}
.nav a[aria-current="page"],.nav a:hover{color:var(--fg);text-decoration:none}
.hero{padding:56px 0 30px}
.hero h1{font-family:var(--serif);font-size:34px;margin:0 0 8px;letter-spacing:.06em}
.hero p{margin:0;color:var(--muted)}
.section-title{font-size:14px;color:var(--muted);letter-spacing:.2em;margin:34px 0 8px;font-weight:600}
.post-list{list-style:none;margin:0;padding:0}
.post-item{padding:24px 0;border-bottom:1px solid var(--line)}
.post-item:last-child{border-bottom:0}
.post-item h2{font-family:var(--serif);font-size:23px;margin:4px 0 6px;line-height:1.45}
.post-item h2 a{color:var(--fg)}
.post-item p{margin:6px 0 10px;color:var(--muted);font-size:15.5px}
.meta{font-size:13.5px;color:var(--muted);display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tag{display:inline-block;background:var(--tag);color:var(--muted);border-radius:999px;padding:1px 11px;font-size:12.5px;line-height:1.9}
a.tag:hover{color:var(--accent);text-decoration:none}
.tag-index{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 10px}
.tag-group{margin:18px 0 6px}
.tag-group h3{font-size:16px;margin:0 0 4px}
.tag-group ul{margin:0;padding-left:1.2em;color:var(--muted)}
article.post{padding:44px 0 20px}
article.post header h1{font-family:var(--serif);font-size:32px;line-height:1.4;margin:0 0 12px;letter-spacing:.03em}
.figure{margin:28px 0 8px}
.figure svg{width:100%;height:auto;display:block;border-radius:14px}
.prose{font-size:17.5px}
.prose p{margin:0 0 1.15em;text-align:justify}
.prose h2{font-family:var(--serif);font-size:22px;margin:2em 0 .7em;padding-left:12px;border-left:4px solid var(--accent);line-height:1.4}
.prose ol{padding-left:1.4em;margin:0 0 1.2em}
.prose li{margin:.35em 0}
.prose .lead{font-size:18.5px;color:var(--fg)}
.note{background:var(--accent-soft);border-radius:12px;padding:14px 18px;font-size:14.5px;color:var(--muted);margin:30px 0}
.post-nav{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:22px 0;margin-top:10px;font-size:15px}
.post-nav a{max-width:48%}
.post-nav .next{text-align:right;margin-left:auto}
.post-nav small{display:block;color:var(--muted);font-size:12.5px}
.about{padding:48px 0 20px}
.about h1{font-family:var(--serif);font-size:30px;margin:0 0 18px}
.about p{margin:0 0 1.1em}
.notfound{padding:90px 0 70px;text-align:center}
.notfound .code{font-family:var(--serif);font-size:84px;line-height:1;color:var(--accent);letter-spacing:.08em}
.notfound h1{font-family:var(--serif);font-size:26px;margin:16px 0 8px}
.notfound p{color:var(--muted);margin:0 0 26px}
.btn{display:inline-block;border:1px solid var(--accent);color:var(--accent);border-radius:999px;padding:6px 22px;font-size:15px}
.btn:hover{background:var(--accent);color:var(--bg);text-decoration:none}
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:26px 0 40px;color:var(--muted);font-size:13.5px}
.site-footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.brand .logo{width:30px;height:30px;border-radius:50%;display:block}
.figure figcaption{font-size:13.5px;color:var(--muted);text-align:center;margin-top:8px;line-height:1.6}
.figure.photo img{width:100%;height:auto;display:block;border-radius:14px;background:var(--tag)}
.figure.cover{margin:26px 0 10px}
.prose .figure{margin:22px 0 26px}
.video{margin:36px 0 10px}
.video-title{font-family:var(--serif);font-size:20px;margin:0 0 12px}
.video-frame{position:relative;width:100%;aspect-ratio:16/9;border-radius:14px;overflow:hidden;background:#000}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-cap{font-size:13.5px;color:var(--muted);margin:8px 0 0}
.post-item{display:flex;gap:20px;align-items:flex-start}
.thumb{flex:0 0 200px;display:block}
.thumb img{width:200px;height:auto;aspect-ratio:16/9;object-fit:cover;border-radius:10px;display:block;margin-top:6px}
.post-text{min-width:0;flex:1}
@media (max-width:600px){
  .post-item{flex-direction:column;gap:10px}
  .thumb{flex:none;width:100%}
  .thumb img{width:100%;margin-top:0}
  body{font-size:16px}
  .wrap{padding:0 18px}
  .site-header .wrap{height:56px}
  .brand{font-size:19px}
  .nav a{margin-left:16px}
  .hero{padding:38px 0 18px}
  .hero h1{font-size:27px}
  .post-item h2{font-size:20px}
  article.post{padding:30px 0 12px}
  article.post header h1{font-size:25px}
  .prose{font-size:16.5px}
  .prose h2{font-size:19.5px}
  .post-nav{flex-direction:column}
  .post-nav a{max-width:100%}
  .post-nav .next{text-align:left;margin-left:0}
  .notfound .code{font-size:64px}
}