/* Structure — all colors come from CSS vars defined by theme files. */
:root{--serif:"Noto Serif SC","Songti SC",SimSun,serif;--sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.85 var(--sans)}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1000px;margin:0 auto;padding:0 18px}
.muted{color:var(--muted)}

/* masthead */
.masthead{border-bottom:1px solid var(--line);background:var(--bg2);position:sticky;top:0;z-index:10;backdrop-filter:saturate(1.2)}
.mast-inner{display:flex;align-items:center;gap:18px;flex-wrap:wrap;padding:14px 18px}
.brand{font-family:var(--serif);font-weight:900;font-size:22px;color:var(--fg);letter-spacing:.02em}
.nav{display:flex;gap:14px;font-size:15px}
.nav a{color:var(--fg)}
.nav a.on{color:var(--accent);font-weight:700}
.searchbox{margin-left:auto}
.searchbox input{background:var(--bg);border:1px solid var(--line);color:var(--fg);border-radius:8px;padding:7px 12px;width:170px;font-size:14px}
.nav-user{color:var(--muted);font-size:14px}
.nav-login{border:1px solid var(--accent);border-radius:8px;padding:4px 12px;color:var(--accent)!important}

/* home */
.hero-home{padding:44px 0 10px;text-align:center}
.hero-title{font-family:var(--serif);font-size:36px;margin:0 0 6px;color:var(--fg)}
.hero-sub{color:var(--muted);margin:0}
.post-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;margin:26px 0}
.home-layout .post-grid{grid-template-columns:repeat(auto-fill,minmax(195px,1fr))}
.post-grid.three{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
.post-card{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}
.post-card:hover{transform:translateY(-2px);box-shadow:0 8px 26px var(--shadow)}
.card-cover{width:100%;height:150px;object-fit:cover}
.card-body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-title{font-size:18px;margin:0;line-height:1.45;font-family:var(--serif)}
.card-title a{color:var(--fg)}
.card-summary{color:var(--muted);font-size:14px;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{margin-top:auto;font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.chip{font-size:12px;border:1px solid var(--line);border-radius:20px;padding:1px 9px;color:var(--muted)}
.chip:hover{color:var(--accent);border-color:var(--accent)}
.pager{display:flex;justify-content:center;gap:18px;margin:30px 0;align-items:center}
.empty{grid-column:1/-1;text-align:center;color:var(--muted);padding:50px 0}

/* article */
.article{margin-top:34px}
.article-hero .kicker{color:var(--accent);font-size:13px;letter-spacing:.18em;text-transform:uppercase}
.article-hero h1{font-family:var(--serif);font-size:32px;line-height:1.35;margin:8px 0 10px}
.lede{color:var(--muted);font-size:17px;margin:0 0 10px}
.byline{display:flex;gap:10px;flex-wrap:wrap;align-items:center;font-size:13.5px;color:var(--muted);margin-bottom:18px}
.byline-name{color:var(--fg);font-weight:700}
.article-cover{width:100%;border-radius:12px;margin:6px 0 24px}
.prose{max-width:65ch;margin:0 auto;font-size:16.5px}
.prose h2{font-family:var(--serif);font-size:24px;margin:44px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.prose h3{font-size:19px;margin:32px 0 10px}
.prose img{max-width:100%!important;width:auto!important;min-width:0;height:auto;border-radius:10px;margin:18px auto;display:block}
.prose figcaption,.prose img+em{display:block;text-align:center;font-size:13px;color:var(--muted);font-style:italic}
.prose blockquote{margin:22px 0;padding:4px 0 4px 20px;border-left:4px solid var(--accent);font-family:var(--serif);font-style:italic;font-size:18.5px;color:var(--fg2)}
.prose pre{background:var(--code-bg);color:var(--code-fg);border-radius:10px;padding:14px 16px;overflow-x:auto;font:13.5px/1.6 var(--mono)}
.prose code{font:var(--mono);font-size:.92em;background:var(--code-bg);color:var(--code-fg);padding:1px 6px;border-radius:5px}
.prose pre code{background:none;padding:0}
.prose table{border-collapse:collapse;width:100%;margin:20px 0;font-size:15px;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.prose th{background:var(--bg2)}
.prose hr{border:none;border-top:1px solid var(--line);margin:34px 0}
.author-card{max-width:65ch;margin:40px auto 0;display:flex;gap:14px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.avatar{width:46px;height:46px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:900;flex:none}
.related{max-width:65ch;margin:46px auto 0}
.related h3{font-family:var(--serif)}

/* comments */
.comments{max-width:65ch;margin:50px auto 0;border-top:1px solid var(--line);padding-top:22px}
.comments h3{font-family:var(--serif);margin-top:0}
.comment-form textarea{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:10px;color:var(--fg);padding:12px;font:15px/1.7 var(--sans);resize:vertical}
.cf-foot{display:flex;justify-content:space-between;align-items:center;margin-top:8px;gap:10px}
.cf-hint{font-size:12.5px;color:var(--muted)}
.comment-form button,.authbox button{background:var(--accent);color:#fff;border:none;border-radius:9px;padding:9px 22px;font-size:15px;cursor:pointer;font-weight:700}
.cf-msg{padding:8px 12px;border-radius:8px;font-size:14px}
.cf-msg.ok{background:var(--ok-bg);color:var(--ok-fg)}
.cf-msg.err{background:var(--err-bg);color:var(--err-fg)}
.comment-list{list-style:none;padding:0;margin:20px 0 0;display:flex;flex-direction:column;gap:14px}
.comment{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px;display:flex;gap:10px}
.c-avatar{width:34px;height:34px;border-radius:50%;color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;flex:none}
.c-main{flex:1;min-width:0}
.c-head{display:flex;gap:10px;align-items:baseline;font-size:13px;color:var(--muted)}
.c-head b{color:var(--fg);font-size:14px}
.c-report{margin-left:auto;background:none;border:none;color:var(--muted);font-size:12px;cursor:pointer}
.c-report:hover{color:var(--err-fg)}
.c-body{white-space:pre-wrap;word-break:break-word;margin-top:6px;font-size:15px}
.login-hint{color:var(--muted)}

/* auth & simple pages */
.authbox{max-width:420px;margin:60px auto;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:26px 28px}
.authbox h2{font-family:var(--serif);margin-top:0}
.authbox label{display:block;margin:14px 0 0;font-size:14px;color:var(--muted)}
.authbox input{width:100%;margin-top:5px;background:var(--bg);border:1px solid var(--line);border-radius:8px;color:var(--fg);padding:9px 12px;font-size:15px}
.authbox button{margin-top:20px;width:100%}
.capwrap img{vertical-align:middle;border-radius:6px;border:1px solid var(--line);cursor:pointer}
.page-title{font-family:var(--serif)}
.arch-month h2{font-family:var(--serif);border-bottom:1px solid var(--line);padding-bottom:6px}
.arch-month ul{list-style:none;padding:0}
.arch-month li{padding:6px 0;border-bottom:1px dashed var(--line)}
.arch-month li a{color:var(--fg)}

/* footer */
.site-foot{margin-top:70px;border-top:1px solid var(--line);background:var(--bg2);padding:26px 0;color:var(--muted);font-size:13.5px;text-align:center}
.site-foot p{margin:4px 0}
.site-foot a{color:var(--muted)}

/* home 2-col + side category nav */
.home-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:26px;align-items:start;margin:26px 0}
.post-list{min-width:0}
.post-list{margin:0}
.side-nav{position:sticky;top:16px;display:flex;flex-direction:column;gap:16px}
.side-card{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.side-title{margin:0 0 10px;font-size:15px;color:var(--fg)}
.cat-list{list-style:none;margin:0;padding:0}
.cat-list li a{display:flex;justify-content:space-between;align-items:center;padding:8px 10px;border-radius:8px;color:var(--fg);text-decoration:none;font-size:14.5px}
.cat-list li a:hover{background:var(--bg)}
.cat-list li.on a{background:var(--accent);color:#fff}
.cat-list li.on a .cat-n{color:rgba(255,255,255,.85)}
.cat-n{font-size:12px;color:var(--muted)}
.side-about{font-size:13px;color:var(--muted);line-height:1.7;margin:6px 0}
.card-cover{width:100%;aspect-ratio:2.35/1;object-fit:cover;border-radius:10px 10px 0 0;display:block}
@media (max-width:820px){
  .post-grid,.home-layout .post-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .home-layout{grid-template-columns:minmax(0,1fr);gap:0}

  .side-nav{position:static;order:-1;flex-direction:row;margin:10px 0 4px}
  .side-nav .side-card:last-child{display:none}
  .side-nav .side-card{padding:0;border:none;background:none;width:100%}
  .side-title{display:none}
  .cat-list{display:flex;gap:8px;overflow-x:auto;padding:2px 2px 10px;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .cat-list::-webkit-scrollbar{display:none}
  .cat-list li{flex:0 0 auto}
  .cat-list li a{display:inline-flex;gap:6px;padding:6px 14px;border:1px solid var(--line);border-radius:20px;background:var(--card);white-space:nowrap;font-size:13.5px}
  .cat-list li.on a{border-color:var(--accent)}
  .cat-n{font-size:11px}
}

@media (max-width:640px){
  .post-grid,.home-layout .post-grid{grid-template-columns:minmax(0,1fr)}
  .mast-inner{padding:12px 14px}
  .searchbox{margin-left:0;width:100%}
  .searchbox input{width:100%}
  .hero-title{font-size:27px}
  .article-hero h1{font-size:24px}
  .prose{font-size:16px}
  .container{padding:0 14px}
}

/* ---- image lightbox ---- */
.lightbox{position:fixed;inset:0;z-index:1000;background:rgba(15,13,10,.92);display:none;align-items:center;justify-content:center;opacity:0;transition:opacity .18s}
.lightbox.open{display:flex;opacity:1}
.lightbox .lb-fig{margin:0;max-width:92vw;max-height:88vh;display:flex;align-items:center;justify-content:center}
.lightbox .lb-fig img{max-width:92vw;max-height:88vh;width:auto;height:auto;object-fit:contain;border-radius:6px;box-shadow:0 10px 50px rgba(0,0,0,.5);background:#fff}
.lightbox .lb-close,.lightbox .lb-prev,.lightbox .lb-next{position:absolute;background:rgba(255,255,255,.12);color:#fff;border:none;cursor:pointer;line-height:1;transition:background .15s}
.lightbox .lb-close:hover,.lightbox .lb-prev:hover,.lightbox .lb-next:hover{background:rgba(255,255,255,.28)}
.lightbox .lb-close{top:16px;right:18px;width:42px;height:42px;border-radius:50%;font-size:26px}
.lightbox .lb-prev,.lightbox .lb-next{top:50%;transform:translateY(-50%);width:48px;height:64px;font-size:40px;border-radius:10px}
.lightbox .lb-prev{left:10px}.lightbox .lb-next{right:10px}
.article .prose img,.article .article-cover{cursor:zoom-in}
@media (max-width:640px){
  .lightbox .lb-prev,.lightbox .lb-next{width:40px;height:56px;font-size:32px}
  .lightbox .lb-close{width:38px;height:38px;font-size:24px;top:12px;right:12px}
}