:root{
  --bg:#f5f7f5; --panel:#ffffff; --panel-2:#fbfcfb;
  --ink:#14211c; --muted:#6d7d77; --line:#e3e9e6; --line-2:#eef2f0;
  --accent:#0f766e; --accent-ink:#0b5d57; --accent-soft:#e7f4f1; --accent-soft-2:#d7ece8;
  --cite:#b45309; --cite-bg:#fdf3e3;
  --shadow:0 1px 2px rgba(16,32,27,.05), 0 8px 24px -12px rgba(16,32,27,.18);
  --radius:16px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
  --mono:ui-monospace,"Cascadia Code","SF Mono",Consolas,monospace;
}
html[data-theme="dark"]{
  --bg:#0d1412; --panel:#151f1c; --panel-2:#121a18;
  --ink:#e9f0ed; --muted:#8fa39c; --line:#24332e; --line-2:#1b2824;
  --accent:#3fb8a6; --accent-ink:#7fd8c9; --accent-soft:#12302b; --accent-soft-2:#173d36;
  --cite:#e0a458; --cite-bg:#2e2314;
  --shadow:0 1px 2px rgba(0,0,0,.35), 0 10px 30px -14px rgba(0,0,0,.7);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink); font-family:var(--font);
  font-size:15.5px; line-height:1.72; -webkit-font-smoothing:antialiased;
  padding-bottom:60px;
}
h1,h2,h3,h4{line-height:1.35;margin:0}
button,input,textarea,select{font-family:inherit;font-size:inherit;color:inherit}
.muted{color:var(--muted)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------------- 顶栏 ---------------- */
.topbar{
  position:sticky; top:0; z-index:30;
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding:14px 22px; background:color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter:saturate(1.4) blur(14px); border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.logo{
  width:38px;height:38px;flex:none;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(145deg,var(--accent),var(--accent-ink));color:#fff;font-size:19px;
  box-shadow:0 4px 12px -4px color-mix(in srgb,var(--accent) 70%, transparent);
}
.brand h1{font-size:17px;letter-spacing:.2px;font-weight:650}
.tagline{margin:0;font-size:12px;color:var(--muted);letter-spacing:.2px}
.topbar-right{display:flex;align-items:center;gap:8px}
.chip{
  display:inline-flex;align-items:center;gap:7px;padding:5px 11px;border-radius:999px;
  background:var(--panel);border:1px solid var(--line);font-size:12.5px;color:var(--muted);
  white-space:nowrap;
}
.dot{width:7px;height:7px;border-radius:50%;background:#9aa7a2;flex:none}
.dot.ok{background:#12a37a;box-shadow:0 0 0 3px color-mix(in srgb,#12a37a 22%,transparent)}
.dot.bad{background:#d9534f;box-shadow:0 0 0 3px color-mix(in srgb,#d9534f 20%,transparent)}
.dot.busy{background:#d99a2b;animation:pulse 1.2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.login-chip{
  background:var(--accent-soft);color:var(--accent-ink);border-color:var(--accent-soft-2);
  font-weight:600;cursor:pointer;
}
.login-chip:hover{text-decoration:none;filter:brightness(.97)}
.model-select{
  max-width:190px;padding:6px 10px;border-radius:10px;border:1px solid var(--line);
  background:var(--panel);font-size:12.5px;color:var(--muted);cursor:pointer;
}
.icon-btn{
  width:34px;height:34px;border-radius:10px;border:1px solid var(--line);
  background:var(--panel);cursor:pointer;display:grid;place-items:center;color:var(--muted);
}
.icon-btn:hover{color:var(--accent);border-color:var(--accent-soft-2)}

/* ---------------- 标签页 ---------------- */
.tabs{
  display:flex;gap:4px;padding:12px 22px 0;max-width:960px;margin:0 auto;
}
.tab{
  border:0;background:none;padding:8px 14px;border-radius:10px 10px 0 0;
  color:var(--muted);cursor:pointer;font-size:14px;border-bottom:2px solid transparent;
}
.tab.active{color:var(--accent-ink);border-bottom-color:var(--accent);font-weight:600}
.tab .count{
  display:inline-block;min-width:20px;padding:0 6px;border-radius:999px;
  background:var(--accent-soft);color:var(--accent-ink);font-size:11.5px;margin-left:4px;
}

main{max-width:960px;margin:0 auto;padding:0 22px 40px}
.view{display:none;animation:fade .25s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

/* ---------------- 提问 ---------------- */
.ask-card{
  position:relative;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;margin-top:16px;
}
.ask-box{display:flex;gap:10px;align-items:flex-end}
#q{
  flex:1;min-height:52px;max-height:200px;resize:none;border:0;outline:none;
  background:transparent;padding:12px 6px 10px;font-size:16px;line-height:1.6;
}
#q::placeholder{color:var(--muted)}
.primary{
  border:0;border-radius:12px;padding:12px 22px;font-size:14.5px;font-weight:600;cursor:pointer;
  background:linear-gradient(145deg,var(--accent),var(--accent-ink));color:#fff;
  box-shadow:0 6px 16px -8px color-mix(in srgb,var(--accent) 80%,transparent);
  transition:transform .12s ease, filter .12s;
}
.primary:hover{filter:brightness(1.06)}
.primary:active{transform:translateY(1px)}
.primary:disabled{opacity:.5;cursor:default;box-shadow:none}
.ask-hint{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--muted);padding:8px 6px 2px}
kbd{
  font-family:var(--mono);font-size:11px;padding:1px 5px;border-radius:5px;
  border:1px solid var(--line);background:var(--panel-2);
}

.quick{
  position:absolute;left:14px;right:14px;top:calc(100% + 6px);z-index:20;
  background:var(--panel);border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow);overflow:hidden;max-height:min(60vh,460px);overflow-y:auto;
}
.quick-item{
  display:block;width:100%;text-align:left;border:0;background:none;padding:11px 14px;
  border-bottom:1px solid var(--line-2);cursor:pointer;
}
.quick-item:last-child{border-bottom:0}
.quick-item:hover{background:var(--accent-soft)}
.quick-item .qt{font-size:13.5px;font-weight:600;display:block;margin-bottom:2px}
.quick-item .qs{font-size:12.5px;color:var(--muted);display:block;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.quick-empty{padding:14px;color:var(--muted);font-size:13px}

/* ---------------- 首页空状态 ---------------- */
.home-empty{margin-top:16px;padding:22px 24px;background:var(--panel);border:1px dashed var(--line);
  border-radius:var(--radius);}
.he-row{display:flex;gap:34px;margin-bottom:14px}
.he-stat b{display:block;font-size:24px;font-weight:650;letter-spacing:-.5px;line-height:1.2}
.he-stat span{font-size:12.5px;color:var(--muted)}
.he-tip{font-size:13px;color:var(--muted);line-height:1.8}
.he-tip code{font-family:var(--mono);font-size:12.5px;background:var(--line-2);padding:1px 6px;
  border-radius:5px;color:var(--accent-ink)}
.he-docs{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.he-doc{font-size:12.5px;padding:6px 12px;border-radius:999px;background:var(--accent-soft);
  color:var(--accent-ink);cursor:pointer;border:1px solid transparent;transition:border-color .15s}
.he-doc:hover{border-color:var(--accent-soft-2)}

/* ---------------- 回答 ---------------- */
.answer-card{
  margin-top:18px;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px 22px;
}
.answer-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px}
.answer-title{display:flex;align-items:center;gap:10px;min-width:0}
.badge{
  font-size:11.5px;letter-spacing:1px;padding:2px 9px;border-radius:6px;
  background:var(--accent-soft);color:var(--accent-ink);font-weight:600;
}
.answer-actions{display:flex;gap:6px;flex:none}
.ghost{
  border:1px solid var(--line);background:var(--panel);color:var(--muted);
  padding:5px 12px;border-radius:9px;cursor:pointer;font-size:12.5px;
}
.ghost:hover{color:var(--accent);border-color:var(--accent-soft-2)}
.answer{font-size:15.5px}
.cursor::after{content:"▍";color:var(--accent);animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}

.section-title{font-size:14px;font-weight:600;margin:26px 0 10px;letter-spacing:.3px;
  display:flex;align-items:center;gap:10px}
.section-title::after{content:"";flex:1;height:1px;background:var(--line)}

/* ---------------- 参考卡片 ---------------- */
.sources{display:grid;gap:10px}
.source{
  background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:13px 15px;
  cursor:pointer;transition:border-color .15s, transform .15s, box-shadow .15s;
  position:relative;
}
.source:hover{border-color:var(--accent-soft-2);transform:translateY(-1px);box-shadow:var(--shadow)}
.source.flash{border-color:var(--accent);background:var(--accent-soft)}
.source-top{display:flex;align-items:baseline;gap:9px;margin-bottom:5px}
.src-num{
  flex:none;width:20px;height:20px;border-radius:6px;display:grid;place-items:center;
  background:var(--cite-bg);color:var(--cite);font-size:11.5px;font-weight:700;
}
.src-title{font-weight:600;font-size:14px;line-height:1.4}
.src-loc{font-size:11.5px;color:var(--muted);margin-left:auto;white-space:nowrap}
.src-snippet{font-size:13px;color:var(--muted);line-height:1.65;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.src-score{font-size:11px;color:var(--muted);opacity:.7;font-family:var(--mono)}

/* ---------------- 资料库 ---------------- */
.docs-toolbar{display:flex;gap:10px;margin:16px 0 14px}
#docFilter{
  flex:1;padding:10px 14px;border-radius:11px;border:1px solid var(--line);
  background:var(--panel);outline:none;
}
#docFilter:focus{border-color:var(--accent-soft-2)}
.doc-list{display:grid;gap:10px}
.doc-item{
  background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:14px 16px;
  cursor:pointer;transition:border-color .15s, transform .15s;
}
.doc-item:hover{border-color:var(--accent-soft-2);transform:translateY(-1px)}
.doc-item h3{font-size:14.5px;font-weight:600;margin-bottom:4px;display:flex;gap:8px;align-items:center}
.doc-item .ext{
  font-size:10.5px;text-transform:uppercase;letter-spacing:.5px;padding:1px 6px;border-radius:5px;
  background:var(--line-2);color:var(--muted);font-weight:600;
}
.doc-item p{margin:0;font-size:12.5px;color:var(--muted);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.doc-item .warn{color:#c2410c;font-size:12.5px}

/* ---------------- 抽屉 ---------------- */
.mask{position:fixed;inset:0;background:rgba(10,20,17,.42);z-index:40;
  backdrop-filter:blur(2px);animation:fade .2s}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(760px,94vw);z-index:41;
  background:var(--panel);border-left:1px solid var(--line);
  display:flex;flex-direction:column;box-shadow:-20px 0 50px -30px rgba(0,0,0,.5);
  animation:slide .24s cubic-bezier(.2,.8,.3,1);
}
@keyframes slide{from{transform:translateX(30px);opacity:.4}to{transform:none;opacity:1}}
.drawer-head{
  display:flex;justify-content:space-between;align-items:flex-start;gap:14px;
  padding:16px 20px;border-bottom:1px solid var(--line);
}
.drawer-head h2{font-size:16px;font-weight:650}
.drawer-head p{margin:3px 0 0;font-size:12px;word-break:break-all}
.drawer-actions{display:flex;gap:8px;align-items:center;flex:none}
.drawer-body{padding:18px 22px 40px;overflow-y:auto;flex:1}
.summary-box{
  background:var(--accent-soft);border:1px solid var(--accent-soft-2);
  border-radius:12px;padding:13px 15px;margin-bottom:20px;font-size:13.5px;line-height:1.75;
}
.summary-box b{color:var(--accent-ink);display:block;font-size:12px;letter-spacing:1px;
  margin-bottom:5px}
.kw{display:inline-block;font-size:11.5px;padding:1px 8px;border-radius:999px;
  background:var(--panel);border:1px solid var(--line);color:var(--muted);margin:6px 5px 0 0}
.sec{border-top:1px solid var(--line-2);padding-top:12px;margin-top:14px}
.sec-loc{font-size:11.5px;color:var(--muted);font-family:var(--mono);margin-bottom:4px}

/* ---------------- Markdown ---------------- */
.md{word-wrap:break-word;overflow-wrap:anywhere}
.md h1,.md h2,.md h3,.md h4{margin:22px 0 8px;font-weight:650}
.md h1{font-size:20px}.md h2{font-size:17.5px}.md h3{font-size:15.5px}.md h4{font-size:14.5px}
.md p{margin:9px 0}
.md ul,.md ol{margin:9px 0;padding-left:22px}
.md li{margin:4px 0}
.md strong{font-weight:650}
.md code{font-family:var(--mono);font-size:13px;background:var(--line-2);
  padding:1.5px 5px;border-radius:5px}
.md pre{background:var(--panel-2);border:1px solid var(--line);border-radius:10px;
  padding:12px 14px;overflow-x:auto;margin:12px 0}
.md pre code{background:none;padding:0;font-size:12.5px;line-height:1.6}
.md blockquote{margin:12px 0;padding:6px 14px;border-left:3px solid var(--accent-soft-2);
  color:var(--muted);background:var(--panel-2);border-radius:0 8px 8px 0}
.md table{border-collapse:collapse;margin:12px 0;font-size:13.5px;width:100%}
.md th,.md td{border:1px solid var(--line);padding:7px 10px;text-align:left}
.md th{background:var(--panel-2);font-weight:600}
.md hr{border:0;border-top:1px solid var(--line);margin:18px 0}
.cite{
  display:inline-flex;align-items:center;justify-content:center;min-width:17px;height:17px;
  padding:0 4px;margin:0 1px;border-radius:5px;background:var(--cite-bg);color:var(--cite);
  font-size:11px;font-weight:700;cursor:pointer;vertical-align:2px;
  font-family:var(--mono);transition:transform .1s;
}
.cite:hover{transform:translateY(-1px)}
.cite.flash{outline:2px solid var(--cite);outline-offset:1px}

.empty{padding:22px 4px;color:var(--muted);font-size:13.5px;text-align:center}
.toast{
  position:fixed;left:50%;bottom:26px;transform:translateX(-50%);z-index:60;
  background:var(--ink);color:var(--bg);padding:9px 16px;border-radius:10px;font-size:13px;
  box-shadow:var(--shadow);
}
.skeleton{height:13px;border-radius:6px;background:linear-gradient(90deg,var(--line-2),var(--line),var(--line-2));
  background-size:200% 100%;animation:shimmer 1.3s infinite}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ---------------- 移动端 ---------------- */
@media (max-width:720px){
  body{font-size:15px}
  .topbar{padding:10px 14px;gap:8px;flex-wrap:wrap}
  .tagline{display:none}
  .brand h1{font-size:15.5px}
  .logo{width:32px;height:32px;font-size:16px;border-radius:9px}
  .model-select{max-width:110px}
  .tabs{padding:10px 14px 0}
  main{padding:0 14px 30px}
  .ask-card{padding:10px;border-radius:14px;margin-top:12px}
  #q{font-size:16px;min-height:76px} /* 防止 iOS 自动放大；容纳两行占位符 */
  .primary{padding:11px 16px}
  .ask-hint{display:none}
  .answer-card{padding:15px 15px 18px}
  .drawer{width:100vw;border-left:0}
  .src-loc{display:none}
  .he-row{gap:24px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}