/* theme-luo —— 与 explorox.top 定制站同款设计 */
:root{
  --bg:#f4f6f5; --surface:#ffffff; --surface2:#eef2f0;
  --ink:#1c2b2e; --ink2:#43545a; --muted:#718086;
  --line:#dde4e1; --line2:#cbd6d2;
  --accent:#0d6e5f; --accent-ink:#0a574b; --accent-soft:#e2f0ec;
  --h3c:#1d6fb8; --h4c:#7a4fa3; --h5c:#b05e14; --h6c:#b03a2e;
  --radius:10px;
  --topbar-h:60px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#10161a; --surface:#182126; --surface2:#1f2b30;
    --ink:#e7edeb; --ink2:#b9c6c2; --muted:#8b9a97;
    --line:#2b3a3f; --line2:#3a4c51;
    --accent:#3cbfa5; --accent-ink:#7fe0cb; --accent-soft:#173b34;
    --h3c:#63a4e6; --h4c:#b48ce0; --h5c:#e09a4e; --h6c:#e07a6a;
  }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:"Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
::selection{background:var(--accent-soft)}
img{max-width:100%}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:50;height:var(--topbar-h);
  background:var(--surface);border-bottom:1px solid var(--line);
  display:flex;align-items:center;gap:20px;padding:0 20px}
.brand{display:flex;align-items:center;gap:10px;white-space:nowrap;min-width:0}
.brand .mark{width:30px;height:30px;flex:none;border-radius:7px;
  object-fit:cover;display:block;border:1px solid var(--line2)}
.brand b{font-size:16.5px;font-weight:900;letter-spacing:.01em}
nav.mainnav{display:flex;gap:4px;margin-left:6px;height:100%}
nav.mainnav a{color:var(--ink2);font-size:14.5px;font-weight:500;padding:6px 12px;border-radius:7px}
nav.mainnav a:hover{background:var(--surface2);text-decoration:none;color:var(--ink)}
.nav-item{position:relative;display:flex;align-items:center;height:100%}
.nav-item.has-children > a::after{content:"▾";font-size:10px;margin-left:5px;color:var(--muted)}
.nav-dropdown{display:none;position:absolute;top:100%;left:0;min-width:230px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:0 12px 32px rgba(20,40,35,.14);padding:6px;z-index:60}
.nav-dropdown::before{content:"";position:absolute;top:-8px;left:0;right:0;height:8px}
.nav-item:hover .nav-dropdown,.nav-item:focus-within .nav-dropdown{display:block}
.nav-dropdown a{display:block;padding:8px 12px;color:var(--ink);white-space:nowrap}
.nav-dropdown a:hover{background:var(--surface2)}
.searchbox{position:relative;width:min(300px,38vw);flex:none}
.searchbox input{width:100%;height:38px;border:1px solid var(--line2);border-radius:8px;
  background:var(--bg);color:var(--ink);font:inherit;font-size:14px;padding:0 12px 0 34px;outline:none}
.searchbox input:focus{border-color:var(--accent);background:var(--surface)}
.searchbox svg{position:absolute;left:10px;top:50%;transform:translateY(-50%);width:16px;height:16px;stroke:var(--muted);fill:none;stroke-width:2;pointer-events:none}
.topbar .spacer{flex:1}
.menu-btn{display:none;border:1px solid var(--line2);background:var(--surface);color:var(--ink);
  height:38px;padding:0 12px;border-radius:8px;font:inherit;font-size:14px;cursor:pointer;
  white-space:nowrap;flex:none}

/* ---------- layout ---------- */
.layout{max-width:1240px;margin:0 auto;display:grid;grid-template-columns:272px minmax(0,1fr);gap:0;align-items:start}
aside{position:sticky;top:var(--topbar-h);height:calc(100vh - var(--topbar-h));overflow-y:auto;
  padding:26px 18px 40px 22px;border-right:1px solid var(--line)}
aside h3{font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--muted);margin:26px 6px 10px}
aside h3:first-child{margin-top:0}
.side-item{display:flex;align-items:baseline;gap:8px;padding:7px 10px;border-radius:8px;font-size:14.5px;line-height:1.45;color:var(--ink);font-weight:700}
a.side-item:hover{background:var(--surface2);text-decoration:none}
.col-empty{font-size:13px;color:var(--muted);padding:4px 10px 6px;line-height:1.6}
.column{margin-bottom:6px}
.col-head{display:flex;align-items:baseline;gap:8px;width:100%;text-align:left;
  padding:8px 10px;border-radius:8px;font-size:15px;font-weight:900;color:var(--ink);
  cursor:pointer;line-height:1.45}
.col-head:hover{background:var(--surface2)}
.col-head .no{color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums;flex:none;font-weight:400}
.col-head a.col-name{color:var(--ink);font-weight:900}
.col-head a.col-name:hover{text-decoration:none}
.col-head .chev{margin-left:auto;flex:none;align-self:center;width:14px;height:14px;
  stroke:var(--muted);fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;
  transition:transform .18s ease}
.column.open .col-head .chev{transform:rotate(180deg)}
.col-body{display:none;padding:2px 0 6px 14px}
.column.open .col-body{display:block}
.col-body .cat-label{font-size:11.5px;font-weight:700;letter-spacing:.1em;color:var(--muted);margin:8px 6px 4px}
.side-item.sub{padding-left:22px;font-size:14px}
main{padding:38px 44px 30px;min-width:0}
article{max-width:780px}

/* ---------- article head ---------- */
.crumb{font-size:13px;color:var(--muted);margin:0 0 14px}
.crumb b{color:var(--ink2);font-weight:500}
h1{font-family:"Noto Serif SC",serif;font-size:clamp(28px,4.2vw,38px);line-height:1.25;font-weight:900;margin:0 0 10px}
h1.list-title{font-family:"Noto Sans SC",sans-serif;font-size:26px;margin-bottom:20px}
.list-desc{color:var(--ink2);margin:-8px 0 20px}
.meta{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13.5px;color:var(--muted);
  padding-bottom:20px;border-bottom:1px solid var(--line);margin-bottom:26px}
.meta b{color:var(--ink2);font-weight:500}
figure{margin:22px 0}
figure img{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:9px}

/* ---------- post list ---------- */
.post-list{max-width:780px}
.post-card{display:flex;gap:18px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);padding:20px 22px;margin:0 0 14px}
.post-card-main{min-width:0;flex:1}
.post-card-title{font-size:19px;font-weight:900;line-height:1.4;margin:0 0 6px}
.post-card-title a{color:var(--ink)}
.post-card-title a:hover{color:var(--accent-ink);text-decoration:none}
.post-card-meta{font-size:13px;color:var(--muted);margin-bottom:8px}
.post-card-meta a{color:var(--muted)}
.post-card-excerpt{margin:0;font-size:14.5px;color:var(--ink2);line-height:1.65;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.post-card-cover{flex:none;width:150px}
.post-card-cover img{width:150px;height:110px;object-fit:cover;border-radius:8px;border:1px solid var(--line);display:block}
.pager{display:flex;align-items:center;gap:18px;font-size:14px;color:var(--muted);margin:22px 0 6px}

/* ---------- article content (markdown) ---------- */
.content{font-size:16px;line-height:1.85;word-wrap:break-word}
.content h1{font-size:26px;font-weight:900;line-height:1.4;margin:40px 0 16px;color:var(--accent-ink)}
.content h2{font-size:22px;font-weight:900;line-height:1.4;margin:38px 0 14px;color:var(--accent)}
.content h3{font-size:18.5px;font-weight:800;margin:30px 0 10px;color:var(--h3c)}
.content h4{font-size:16px;font-weight:700;margin:26px 0 10px;color:var(--h4c)}
.content h5{font-size:15px;font-weight:700;margin:22px 0 8px;color:var(--h5c)}
.content h6{font-size:15px;font-weight:700;margin:22px 0 8px;color:var(--h6c)}
.content img{max-width:100%;height:auto;display:block;margin:18px auto;border-radius:8px}
#toc-box{padding-bottom:14px}
body.no-sidebar .layout{grid-template-columns:minmax(0,1fr)}
body.no-sidebar aside{display:none}
body.no-sidebar main{max-width:920px;margin:0 auto;width:100%}
body.no-sidebar #menuBtn{display:none}
#toc-box[hidden] + h3{margin-top:0}
#toc-list{list-style:none;margin:0;padding:0}
#toc-list a{display:block;padding:4px 10px;border-radius:6px;color:var(--ink2);font-size:14px;line-height:1.5}
#toc-list a:hover{background:var(--surface2);text-decoration:none}
#toc-list a.active{color:var(--accent);font-weight:700;background:var(--accent-soft)}
#toc-list .toc-h3 a{padding-left:22px;font-size:13.5px}
#toc-list .toc-h4 a{padding-left:34px;font-size:13px;color:var(--muted)}
#toc-list .toc-h4 a.active{color:var(--accent)}
.content h2,.content h3,.content h4{scroll-margin-top:76px}
mark.hl-hit{background:#ffe58a;color:#1c2b2e;border-radius:2px;padding:0 1px}
mark.hl-hit.hl-current{background:#ff8c1a;color:#fff}
#findbar{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:80;display:flex;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--line2);border-radius:999px;box-shadow:0 10px 30px rgba(10,30,25,.22);padding:6px 8px 6px 14px;font-size:13.5px;color:var(--ink);max-width:92vw}
#findbar .fb-kw{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:34vw}
#findbar .fb-count{color:var(--muted);white-space:nowrap}
#findbar button{border:1px solid var(--line2);background:var(--surface2);color:var(--ink);width:30px;height:30px;border-radius:50%;cursor:pointer;font-size:14px;line-height:1;flex:none}
#findbar button:hover{border-color:var(--accent);color:var(--accent)}
.content p{margin:0 0 14px}
.content ul,.content ol{margin:0 0 14px;padding-left:24px}
.content li{margin:5px 0}
.content li::marker{color:var(--accent)}
.content strong{font-weight:700}
.content img{display:block;max-width:100%;height:auto;margin:18px auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.content table{border-collapse:collapse;width:100%;font-size:14.5px;margin:14px 0; display:block;overflow-x:auto}
.content th,.content td{padding:10px 14px;text-align:left;border:1px solid var(--line)}
.content thead th{background:var(--surface2);font-size:13.5px;color:var(--ink2);font-weight:700}
.content blockquote{margin:16px 0;padding:12px 18px;background:var(--accent-soft);
  border-left:3px solid var(--accent);border-radius:0 8px 8px 0;color:var(--ink)}
.content blockquote p{margin:0}
.content code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88em;
  background:var(--surface2);border-radius:5px;padding:1px 5px}
.content pre{background:var(--surface2);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px 16px;overflow-x:auto;line-height:1.6}
.content pre code{background:transparent;padding:0}
.content hr{border:0;border-top:1px solid var(--line);margin:28px 0}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:28px 0 6px}
.tag-chip{font-size:13px;color:var(--accent-ink);background:var(--accent-soft);
  border-radius:99px;padding:3px 12px}
.tag-chip:hover{text-decoration:none;background:var(--surface2)}
.tag-row.big .tag-chip{font-size:14.5px;padding:5px 14px}

/* ---------- archives / categories ---------- */
.archive-year{font-size:20px;font-weight:900;margin:26px 0 10px}
.archive-list{list-style:none;margin:0 0 6px;padding:0;max-width:780px}
.archive-list li{display:flex;gap:14px;padding:8px 4px;border-bottom:1px dashed var(--line);font-size:15px}
.archive-date{color:var(--muted);font-variant-numeric:tabular-nums;flex:none}
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;max-width:900px}
h2.home-sec{font-size:20px;font-weight:900;margin:30px 0 14px}
h2.home-sec:first-child{margin-top:6px}
.home-cats{margin-bottom:8px}
.cat-card .cat-count{display:block;font-size:12.5px;color:var(--accent);margin-bottom:2px}
.cat-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;color:var(--ink)}
.cat-card:hover{text-decoration:none;border-color:var(--accent)}
.cat-card b{display:block;font-size:16px;margin-bottom:4px}
.cat-card span{font-size:13.5px;color:var(--muted)}

/* ---------- footer / error ---------- */
footer.site{border-top:1px solid var(--line);margin-top:44px;padding:22px 0 34px;
  display:flex;flex-wrap:wrap;gap:6px 22px;font-size:13px;color:var(--muted);max-width:780px}
footer.site b{color:var(--ink2);font-weight:500}
footer.site .foot-note{flex-basis:100%}
footer.site a{color:var(--accent);text-decoration:none}
.error-main{max-width:640px;margin:80px auto;padding:0 20px}

@media (max-width:900px){
  .topbar{gap:10px;padding:0 12px}
  .brand b{font-size:14.5px}
  nav.mainnav{display:none}
  .menu-btn{display:block}
  .searchbox{width:auto;flex:1 1 0;max-width:150px;min-width:0}
  .searchbox input{padding-left:28px;font-size:13px}
  .searchbox svg{left:8px;width:14px;height:14px}
  .layout{grid-template-columns:1fr}
  aside{display:none;position:fixed;inset:var(--topbar-h) auto 0 0;width:min(300px,84vw);z-index:40;
    background:var(--surface);height:calc(100dvh - var(--topbar-h));border-right:1px solid var(--line2)}
  aside.open{display:block;box-shadow:0 12px 40px rgba(0,0,0,.18)}
  main{padding:26px 18px 20px}
  .post-card{flex-direction:column}
  .post-card-cover,.post-card-cover img{width:100%}
  .post-card-cover img{height:160px}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
}