:root{
  --primary:#2563eb; --primary-dark:#1e40af; --primary-light:#dbeafe;
  --accent:#0ea5e9; --accent-light:#e0f2fe;
  --success:#059669; --success-light:#d1fae5;
  --warn:#d97706; --warn-light:#fef3c7;
  --danger:#dc2626; --danger-light:#fee2e2;
  --purple:#7c3aed; --purple-light:#ede9fe;
  --ink:#0f172a; --ink-2:#475569; --ink-3:#94a3b8;
  --bg:#f1f5f9; --card:#fff; --line:#e2e8f0;
  --radius:14px;
  --shadow:0 1px 3px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.07);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,select,textarea{font-family:inherit;font-size:14px;border:1px solid var(--line);border-radius:8px;padding:9px 12px;outline:none;transition:.15s}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
label{display:block;font-size:13px;font-weight:600;color:var(--ink-2);margin-bottom:5px}
a{color:var(--primary);text-decoration:none}

/* ===== Auth ===== */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--ink) 0%,#1e3a8a 60%,var(--primary) 100%);padding:20px;position:relative;overflow:hidden}
.auth-wrap::before{content:"";position:absolute;inset:0;background-image:linear-gradient(#fff 1px,transparent 1px),linear-gradient(90deg,#fff 1px,transparent 1px);background-size:42px 42px;opacity:.06}
.auth-box{position:relative;width:100%;max-width:420px;background:var(--card);border-radius:18px;box-shadow:0 20px 60px rgba(0,0,0,.35);padding:38px 34px}
.auth-box h1{font-size:22px;font-weight:800;text-align:center;color:var(--ink)}
.auth-box .sub{text-align:center;color:var(--ink-3);font-size:13px;margin:6px 0 26px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 18px;border-radius:9px;font-weight:600;font-size:14px;transition:.15s}
.btn-p{background:var(--primary);color:#fff}
.btn-p:hover{background:var(--primary-dark)}
.btn-o{background:#fff;border:1px solid var(--line);color:var(--ink-2)}
.btn-o:hover{background:var(--bg)}
.btn-s{background:var(--success);color:#fff}
.btn-d{background:var(--danger-light);color:var(--danger)}
.btn-w{background:var(--warn);color:#fff}
.btn-block{width:100%}
.btn:disabled{opacity:.6;cursor:not-allowed}

/* ===== SVG 图标 ===== */
.icv{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;color:inherit}
.icv svg{width:1em;height:1em;display:block}
.btn .icv svg,.btn .wi svg{width:15px;height:15px}
.btn-p .icv,.btn-s .icv{color:#fff}
.btn-o .icv{color:var(--ink-3)}
.card h3 .icv{width:20px;height:20px}
.card h3 .icv svg{width:18px;height:18px}
.card h3 .icv.t1{color:var(--primary)}
.card h3 .icv.t2{color:var(--accent)}
.avatar .icv svg,.avatar svg{width:16px;height:16px;color:#fff}
.logo .icv svg,.logo svg{width:19px;height:19px;color:#fff}
.nav-item .icv svg{width:17px;height:17px}
.toggle-link{text-align:center;margin-top:16px;font-size:13.5px;color:var(--ink-3)}
.toggle-link a{color:var(--primary);font-weight:600}
.err{background:var(--danger-light);color:var(--danger);padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:14px;display:none}

/* ===== Layout ===== */
.layout{display:flex;min-height:100vh}
.sidebar{width:230px;background:var(--ink);color:#cbd5e1;display:flex;flex-direction:column;flex-shrink:0;position:sticky;top:0;height:100vh}
.sidebar .brand{display:flex;align-items:center;gap:10px;padding:20px 18px;color:#fff;font-weight:800;font-size:16px;border-bottom:1px solid rgba(255,255,255,.08)}
.sidebar .brand .logo{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;font-size:17px}
.side-nav{padding:14px 10px;flex:1;overflow-y:auto}
.nav-item{display:flex;align-items:center;gap:11px;padding:11px 13px;border-radius:9px;margin-bottom:3px;font-size:14px;cursor:pointer;color:#cbd5e1;transition:.15s}
.nav-item:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-item.active{background:var(--primary);color:#fff;font-weight:600}
.nav-item .ni{font-size:10px;font-weight:700;width:28px;height:24px;line-height:24px;text-align:center;background:rgba(255,255,255,.12);border-radius:6px;letter-spacing:.5px;flex-shrink:0}
.nav-item.active .ni{background:rgba(255,255,255,.25)}
.nav-sec{font-size:11px;color:var(--ink-3);padding:12px 13px 5px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:rgba(148,163,184,.7)}
.sidebar-foot{padding:14px;border-top:1px solid rgba(255,255,255,.08)}
.user-chip{display:flex;align-items:center;gap:9px;font-size:13px;color:#cbd5e1}
.user-chip .avatar{width:30px;height:30px;border-radius:50%;background:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff}
.user-chip .logout{margin-left:auto;font-size:12px;color:var(--ink-3);cursor:pointer}
.user-chip .logout:hover{color:var(--danger)}

.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{background:#fff;border-bottom:1px solid var(--line);padding:14px 26px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:40}
.topbar h2{font-size:18px;font-weight:800}
.topbar .crumb{font-size:12px;color:var(--ink-3)}
.content{padding:26px;flex:1}
.page{display:none;animation:fade .25s}
.page.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ===== Cards / grids ===== */
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:16px}
.card h3{font-size:15px;font-weight:700;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.card .dim{color:var(--ink-3);font-size:13px}
.stat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;text-align:center}
.stat-card .num{font-size:30px;font-weight:800;color:var(--primary)}
.stat-card .lbl{font-size:13px;color:var(--ink-2);margin-top:4px}

/* ===== Forms ===== */
.f-row{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-bottom:14px}
.f-field{margin-bottom:14px}
textarea{width:100%;min-height:90px;resize:vertical}
.hint{font-size:12px;color:var(--ink-3);margin-top:4px}

/* ===== Doc editor ===== */
.editor-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.editor-grid .card{margin-bottom:0}
.edit-ta{width:100%;min-height:520px;font-family:"SFMono-Regular",Consolas,"Courier New",monospace;font-size:13.5px;line-height:1.7;background:#0b1220;color:#e2e8f0;border:1px solid #1e293b;border-radius:10px;padding:16px;white-space:pre-wrap}
.preview{min-height:520px;border:1px solid var(--line);border-radius:10px;padding:22px;background:#fdfbf7;overflow-y:auto}
.preview h1{font-size:24px;color:var(--ink);text-align:center;border-bottom:2px solid var(--primary);padding-bottom:12px;margin-bottom:16px}
.preview h2{font-size:18px;color:var(--primary-dark);margin:18px 0 8px;border-left:4px solid var(--primary);padding-left:10px}
.preview h3{font-size:15px;color:var(--ink);margin:12px 0 6px}
.preview p{margin:6px 0;font-size:14px;line-height:1.8}
.preview li{list-style-position:inside;margin:4px 0;font-size:14px;line-height:1.7}
.preview a{color:var(--primary)}
.preview b{color:var(--ink)}
.preview pre{background:#0b1220;color:#e2e8f0;padding:12px;border-radius:8px;overflow-x:auto;margin:10px 0;font-size:13px;line-height:1.6}
.preview pre code{background:none;padding:0;color:inherit}
.preview code{background:#eef2f7;color:#c0392b;padding:2px 5px;border-radius:4px;font-size:13px;font-family:"SFMono-Regular",Consolas,monospace}
.preview table{border-collapse:collapse;width:100%;margin:10px 0;font-size:13.5px}
.preview th,.preview td{border:1px solid #e2e0da;padding:8px 10px;text-align:left}
.preview th{background:#f3f1ea;color:var(--ink);font-weight:600}
.preview blockquote{margin:10px 0;padding:8px 14px;border-left:4px solid var(--primary);background:#f7f5ee;color:var(--ink-2);border-radius:0 8px 8px 0}
.preview img{max-width:100%;height:auto;border-radius:8px;margin:8px 0}
.preview hr{border:none;border-top:1px solid var(--line);margin:14px 0}
.preview ul,.preview ol{padding-left:22px;margin:6px 0}
.preview .md-gap{height:10px}

/* ===== Chat ===== */
.chat-box{display:flex;flex-direction:column;height:62vh;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--card)}
.chat-msgs{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:12px}
.msg{max-width:80%;padding:11px 15px;border-radius:12px;font-size:14px;white-space:pre-wrap;line-height:1.7}
.msg.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}
.msg.ai{align-self:flex-start;background:var(--bg);border:1px solid var(--line);border-bottom-left-radius:4px}
.msg.sys{align-self:center;background:var(--warn-light);color:var(--warn);font-size:12.5px;border-radius:999px;padding:6px 16px}
.chat-input{display:flex;gap:10px;padding:14px;border-top:1px solid var(--line);background:#f8fafc}
.chat-input textarea{flex:1;min-height:44px;max-height:120px}

/* ===== Checklist (检查结果) ===== */
.check-item{border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:10px}
.check-item .head{display:flex;align-items:center;gap:9px;font-weight:600;font-size:14px;margin-bottom:5px}
.sev-pass{color:var(--success)} .sev-warn{color:var(--warn)} .sev-fail{color:var(--danger)}
.sev-badge{font-size:11px;padding:2px 9px;border-radius:999px;font-weight:700}
.sev-badge.pass{background:var(--success-light);color:var(--success)}
.sev-badge.warn{background:var(--warn-light);color:var(--warn)}
.sev-badge.fail{background:var(--danger-light);color:var(--danger)}
.score-ring{width:120px;height:120px;margin:0 auto 14px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-direction:column;background:conic-gradient(var(--success) calc(var(--score)*1%),var(--line) 0);position:relative}
.score-ring::before{content:"";position:absolute;inset:9px;background:#fff;border-radius:50%}
.score-ring .val{position:relative;font-size:28px;font-weight:800}
.score-ring .lab{position:relative;font-size:12px;color:var(--ink-3)}

/* ===== Doc list ===== */
.doc-row{display:flex;align-items:center;gap:14px;padding:14px 16px;border:1px solid var(--line);border-radius:11px;margin-bottom:10px;background:var(--card);transition:.15s;cursor:pointer}
.doc-row:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.doc-row .icon{width:42px;height:42px;border-radius:10px;background:var(--primary-light);color:var(--primary-dark);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}
.doc-row .mid{flex:1;min-width:0}
.doc-row .title{font-weight:700;font-size:15px}
.doc-row .meta{font-size:12.5px;color:var(--ink-3);margin-top:2px}
.doc-row .actions{display:flex;gap:8px}
.docs-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.docs-head h3{margin-bottom:0}
.doc-filters{display:flex;gap:10px;align-items:center;margin-bottom:14px}.doc-filters input{flex:1;min-width:180px}.doc-filters select{min-width:132px}
.pager{display:flex;align-items:center;justify-content:flex-end;gap:8px;margin-top:16px;font-size:13px;color:var(--ink-3)}.pager .btn{padding:7px 11px;font-size:12px}
.tag{font-size:11px;padding:3px 9px;border-radius:6px;font-weight:700;white-space:nowrap}
.tag.draft{background:var(--warn-light);color:var(--warn)}
.tag.checked{background:var(--success-light);color:var(--success)}
.tag.type{background:var(--accent-light);color:var(--accent)}
.tag.ver{background:var(--purple-light);color:var(--purple)}
.kb-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.kb-item{border:1px solid var(--line);border-radius:10px;padding:14px 16px;background:#fff}
.kb-head{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-bottom:5px}
.kb-head b{font-size:13.5px;line-height:1.4}

/* ===== quick templates ===== */
.qt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}
.qt{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:14px;text-align:center;cursor:pointer;transition:.15s}
.qt:hover{border-color:var(--primary);background:var(--primary-light);transform:translateY(-2px)}
.qt .qi{font-size:24px;margin-bottom:6px}
.qt .qn{font-size:13px;font-weight:600}
.qt .qt2{font-size:11.5px;color:var(--ink-3);margin-top:2px}
.qt.active{outline:2px solid var(--primary)}

/* ===== loading ===== */
.loading{display:inline-flex;align-items:center;gap:10px;color:var(--ink-3);font-size:14px}
.spinner{width:18px;height:18px;border:3px solid var(--primary-light);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.empty{text-align:center;color:var(--ink-3);padding:40px 20px;font-size:14px}
.empty .ei{font-size:46px;margin-bottom:10px}

/* toast */
#toast{position:fixed;top:18px;left:50%;transform:translateX(-50%) translateY(-80px);background:var(--ink);color:#fff;padding:11px 20px;border-radius:9px;font-size:14px;z-index:200;transition:.3s;opacity:0}
#toast.show{transform:translateX(-50%) translateY(0);opacity:1}
#toast.err{background:var(--danger)}

/* responsive */
@media(max-width:900px){
  .sidebar{width:64px}
  .sidebar .brand span,.nav-item .nt,.nav-sec,.sidebar-foot .user-chip span,.user-chip .logout{display:none}
  .sidebar .brand{justify-content:center;padding:18px 0}
  .nav-item{justify-content:center;padding:12px}
  .editor-grid{grid-template-columns:1fr}
  .content{padding:18px}
  .topbar{padding:12px 18px}
}
@media(max-width:620px){
  body{padding-bottom:66px}
  .layout{display:block}
  .sidebar{position:fixed;z-index:80;bottom:0;top:auto;left:0;width:100%;height:66px;display:block;background:var(--ink);box-shadow:0 -4px 18px rgba(15,23,42,.16)}
  .sidebar .brand,.nav-sec,.sidebar-foot{display:none}
  .side-nav{display:flex;align-items:center;justify-content:space-around;height:66px;padding:6px 4px;overflow:visible}
  .nav-item{flex:1;flex-direction:column;gap:1px;padding:4px 2px;margin:0;font-size:10px;border-radius:7px;min-width:0}
  .nav-item .nt{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
  .nav-item .ni{display:none}
  .nav-item .icv svg{width:19px;height:19px}
  .content{padding:14px 12px}
  .topbar{position:static;padding:12px 14px}
  .topbar h2{font-size:16px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .card{padding:15px;border-radius:11px}
  .doc-row{align-items:flex-start;flex-wrap:wrap;padding:13px}
  .doc-row .actions{width:100%;padding-left:56px;overflow-x:auto}
  .doc-row .actions .btn{flex:1;white-space:nowrap}
  .docs-head{align-items:flex-start}.doc-filters{flex-wrap:wrap}.doc-filters input{width:100%}.doc-filters select{flex:1}.doc-filters .btn{flex:1}
  .chat-box{height:calc(100vh - 230px);min-height:380px}
  .chat-input{padding:10px;align-items:flex-end}
  .chat-input .btn{padding:10px 12px}
  .preview,.edit-ta{min-height:400px}
}