:root{
  --bg:#f0f2f5; --surface:#fff; --surface-2:#f0f2f5; --fg:#080809; --muted:#65676b;
  --accent:#1877f2; --accent-press:#166fe5; --green:#42b72a; --green-press:#36a420;
  --red:#e4573d; --border:#ced0d4; --divider:#e4e6eb; --chip:#e7f0fe; --chip-fg:#1877f2;
  --shadow:0 1px 2px rgba(0,0,0,.1),0 1px 3px rgba(0,0,0,.06);
  --banner:linear-gradient(120deg,#1877f2,#0a4da6 60%,#083a7d);
  --ff:"Segoe UI",Roboto,Helvetica,Arial,-apple-system,BlinkMacSystemFont,sans-serif;
  --topbar-h:56px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#18191a; --surface:#242526; --surface-2:#3a3b3c; --fg:#e4e6eb; --muted:#b0b3b8;
  --accent:#2d88ff; --accent-press:#4a9bff; --green:#45bd62; --green-press:#5ac973;
  --red:#ff6a52; --border:#3e4042; --divider:#3e4042; --chip:#263951; --chip-fg:#60a5fa;
  --shadow:0 1px 2px rgba(0,0,0,.4); --banner:linear-gradient(120deg,#1b3b63,#13294a 60%,#0d1d36);
  color-scheme:dark;
}}
:root[data-theme="dark"]{
  --bg:#18191a; --surface:#242526; --surface-2:#3a3b3c; --fg:#e4e6eb; --muted:#b0b3b8;
  --accent:#2d88ff; --accent-press:#4a9bff; --green:#45bd62; --green-press:#5ac973;
  --red:#ff6a52; --border:#3e4042; --divider:#3e4042; --chip:#263951; --chip-fg:#60a5fa;
  --shadow:0 1px 2px rgba(0,0,0,.4); --banner:linear-gradient(120deg,#1b3b63,#13294a 60%,#0d1d36);
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--fg);font-family:var(--ff);font-size:15px;line-height:1.34}
h1,h2,h3{margin:0;text-wrap:balance}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select,textarea{font-family:inherit;font-size:15px}
a{color:var(--accent);text-decoration:none}
img{max-width:100%}
[hidden]{display:none!important}
.tnum{font-variant-numeric:tabular-nums}
.topbar{position:sticky;top:0;z-index:50;background:var(--surface);box-shadow:var(--shadow);display:flex;align-items:center;gap:12px;height:var(--topbar-h);padding:0 max(12px,env(safe-area-inset-left,0px)) 0 max(12px,env(safe-area-inset-right,0px))}
.brand{display:flex;align-items:center;gap:9px;flex:0 0 auto;cursor:pointer}
.logo{width:40px;height:40px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:800;font-size:17px;letter-spacing:.5px}
.wordmark{font-weight:800;font-size:19px;letter-spacing:-.3px;line-height:1}
.wordmark small{display:block;font-weight:600;font-size:10px;letter-spacing:2.5px;color:var(--muted);text-transform:uppercase;margin-top:2px}
.gsearch{flex:1 1 200px;min-width:0;max-width:360px;display:flex;align-items:center;gap:8px;background:var(--surface-2);border-radius:20px;padding:9px 14px}
.gsearch input{border:none;background:none;outline:none;color:var(--fg);width:100%;min-width:0}
.gsearch svg{flex:0 0 auto;opacity:.6}
.spacer{flex:1 1 auto}
.iconbtn{width:40px;height:40px;border-radius:50%;background:var(--surface-2);display:grid;place-items:center;flex:0 0 auto;overflow:hidden}
.iconbtn:hover{background:var(--divider)}
.iconbtn svg{width:20px;height:20px}
.tabs{display:flex;justify-content:center;gap:2px;background:var(--surface);box-shadow:var(--shadow);position:sticky;top:var(--topbar-h);z-index:40;overflow-x:auto}
.tab{padding:11px 10px 0;min-width:76px;flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:6px;color:var(--muted);font-size:11px;font-weight:600;border-bottom:3px solid transparent}
.tab svg{width:24px;height:24px}
.tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.tab span{padding-bottom:9px}
.shell{max-width:680px;margin:0 auto;display:grid;grid-template-columns:1fr;gap:16px;padding:16px max(16px,env(safe-area-inset-left,0px)) 48px max(16px,env(safe-area-inset-right,0px))}
.col-main{min-width:0;width:100%;display:flex;flex-direction:column;gap:16px}
.rail{display:none;min-width:0}
@media (min-width:1000px){
  .tabs{display:none}
  .shell{max-width:1000px;grid-template-columns:260px minmax(0,1fr);justify-content:center;align-items:start}
  .rail-left{display:flex;flex-direction:column;gap:16px;position:sticky;top:calc(var(--topbar-h) + 16px)}
}
@media (min-width:1200px){
  .shell{max-width:1500px;grid-template-columns:minmax(260px,300px) minmax(0,680px) minmax(280px,340px)}
  .rail-right{display:flex;flex-direction:column;gap:16px;position:sticky;top:calc(var(--topbar-h) + 16px)}
}
.card{background:var(--surface);border-radius:12px;box-shadow:var(--shadow);overflow:hidden}
.pad{padding:16px}
.row{display:flex;align-items:center;gap:10px}
.avatar{border-radius:50%;object-fit:cover;flex:0 0 auto;display:grid;place-items:center;color:#fff;font-weight:700;background:var(--accent);overflow:hidden}
.avatar img{width:100%;height:100%;object-fit:cover}
.btn{border-radius:6px;padding:0 16px;min-height:36px;font-weight:600;font-size:15px;line-height:1;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:background .12s,filter .12s}
.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-press)}
.btn-green{background:var(--green);color:#fff}.btn-green:hover{background:var(--green-press)}
.btn-ghost{background:var(--surface-2);color:var(--fg)}.btn-ghost:hover{background:var(--divider)}
.btn-danger{background:transparent;color:var(--red);border:1px solid var(--red)}
.btn-block{width:100%;min-height:40px}
.btn:disabled{opacity:.55;cursor:not-allowed}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13px;font-weight:600;color:var(--muted)}
.field input,.field select,.field textarea{background:var(--surface-2);border:1px solid var(--border);border-radius:8px;padding:11px 12px;color:var(--fg);outline:none;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--accent)}
.field textarea{resize:vertical;min-height:84px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
@media (max-width:460px){.grid2{grid-template-columns:1fr}}
.hint{font-size:12px;color:var(--muted)}
.err{color:var(--red);font-size:13px;font-weight:600}
.ok{color:var(--green);font-size:13px;font-weight:600}
.section-title{font-size:20px;font-weight:800;letter-spacing:-.3px}
.eyebrow{font-size:11px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted)}
.chip{background:var(--chip);color:var(--chip-fg);border-radius:20px;padding:5px 12px;font-size:12.5px;font-weight:600;display:inline-flex;gap:5px;cursor:pointer;border:none}
.chip:hover{filter:brightness(.97)}
.pill{background:var(--surface-2);border:1px solid var(--border);border-radius:20px;padding:6px 13px;font-size:13px;font-weight:600;color:var(--fg)}
.muted{color:var(--muted)}
.divider{height:1px;background:var(--divider)}
.verified-badge{color:var(--accent);font-size:13px;margin-left:5px}
.rnav{display:flex;flex-direction:column;gap:2px}
.rnav-item{display:flex;align-items:center;gap:12px;padding:6px 8px;border-radius:8px;color:var(--fg);font-weight:600;font-size:15px;cursor:pointer}
.rnav-item:hover{background:var(--surface-2)}
.rnav-item.active{color:var(--accent)}
.rico{width:36px;height:36px;border-radius:50%;background:var(--surface-2);display:grid;place-items:center;flex:0 0 auto;color:var(--fg)}
.rnav-item.active .rico{background:var(--chip);color:var(--accent)}
.rico svg{width:20px;height:20px}
.rail-title{font-size:15px;font-weight:700}
.rail-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.rail-stats{display:flex;gap:8px;margin-top:12px}
.rail-stats>div{flex:1;background:var(--surface-2);border-radius:8px;padding:10px 6px;text-align:center}
.rail-stats b{display:block;font-size:19px;font-variant-numeric:tabular-nums}
.rail-stats span{font-size:11px;color:var(--muted)}
.post .head{display:flex;gap:10px;align-items:center;padding:14px 16px 0}
.post .name{font-weight:700}
.post .meta{font-size:12.5px;color:var(--muted)}
.post .body{padding:6px 16px 12px;white-space:pre-wrap;word-wrap:break-word}
.post .actions{display:flex;border-top:1px solid var(--divider)}
.post .actions button{flex:1;padding:9px;color:var(--muted);font-weight:600;font-size:14px;display:flex;align-items:center;justify-content:center;gap:7px}
.post .actions button:hover{background:var(--surface-2)}
.filterbar{display:flex;flex-wrap:wrap;gap:10px}
.filterbar .field{margin:0;flex:1 1 150px;min-width:0}
.doccard{display:flex;gap:14px;align-items:center;padding:14px 16px}
.doccard .avatar{cursor:pointer}
.doccard .info{min-width:0;flex:1}
.doccard .dn{font-weight:700;font-size:16px;cursor:pointer}
.doccard .dn:hover{text-decoration:underline}
.doccard .spec{color:var(--accent);font-weight:600;font-size:13.5px}
.doccard .loc{font-size:13px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.result-count{font-size:13px;color:var(--muted);padding:2px}
.banner{height:200px;background:var(--banner)}
.profile-head{padding:0 16px 16px;display:flex;flex-direction:column;align-items:center;text-align:center}
.profile-head .avatar{margin-top:-60px;border:4px solid var(--surface);width:136px;height:136px;font-size:48px}
.profile-head h2{font-size:28px;margin-top:10px;letter-spacing:-.4px}
.profile-head .hl{color:var(--accent);font-weight:700;margin-top:2px}
.profile-head .sub{color:var(--muted);font-size:14px;margin-top:4px}
.profile-cta{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap;justify-content:center}
.about-row{display:flex;gap:12px;align-items:flex-start;padding:7px 0}
.about-row svg{width:20px;height:20px;flex:0 0 auto;margin-top:1px;opacity:.7}
.about-row b{font-weight:600}
.empty{text-align:center;padding:40px 20px;color:var(--muted)}
.empty svg{width:46px;height:46px;opacity:.5;margin-bottom:10px}
.empty .t{font-weight:700;color:var(--fg);font-size:17px}
.skel{background:linear-gradient(90deg,var(--surface-2),var(--divider),var(--surface-2));background-size:200% 100%;animation:sh 1.3s infinite;border-radius:8px}
@keyframes sh{to{background-position:-200% 0}}
@media (prefers-reduced-motion:reduce){.skel{animation:none}}
.modal-bg{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:100;display:grid;place-items:center;padding:16px}
.modal{background:var(--surface);border-radius:12px;max-width:500px;width:100%;box-shadow:0 12px 40px rgba(0,0,0,.4);max-height:92vh;overflow:auto}
.modal .mhead{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--divider)}
.modal .mhead h3{font-size:18px}
.x{width:34px;height:34px;border-radius:50%;background:var(--surface-2);display:grid;place-items:center;font-size:17px}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:#242526;color:#fff;padding:12px 20px;border-radius:10px;z-index:200;box-shadow:0 8px 24px rgba(0,0,0,.4);font-weight:600;font-size:14px;max-width:90vw}
.linklike{color:var(--accent);font-weight:600;cursor:pointer}
.auth-switch{text-align:center;margin-top:12px;font-size:14px;color:var(--muted)}