:root{
  --bg:#f4f6fa; --card:#ffffff; --text:#1f2937; --muted:#6b7280; --line:#e5e7eb;
  --primary:#2563eb; --primary-dark:#1d4ed8; --primary-soft:#eff4ff;
  --ok:#16a34a; --ok-soft:#ecfdf5; --err:#dc2626; --err-soft:#fef2f2;
  --warn:#d97706; --warn-soft:#fffbeb;
  --shadow:0 1px 3px rgba(16,24,40,.06),0 1px 2px rgba(16,24,40,.04);
  --radius:12px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;font-size:14px}
input,select,textarea{font-family:inherit;font-size:14px;color:var(--text)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}

/* ---------- 顶栏 ---------- */
.topbar{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.topbar .wrap{display:flex;align-items:center;gap:16px;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:700}
.logo .dot{width:28px;height:28px;border-radius:8px;background:var(--primary);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:14px}
.logo a{color:inherit;text-decoration:none}
.spacer{flex:1}
.navbtn{padding:6px 14px;border-radius:8px;color:var(--muted);font-size:14px;text-decoration:none;display:inline-block}
.navbtn:hover{background:var(--bg);color:var(--text)}
.navbtn.on{background:var(--primary-soft);color:var(--primary);font-weight:600}

/* ---------- 通用 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.pad{padding:24px}
.muted{color:var(--muted)}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.btn{padding:10px 20px;border-radius:9px;background:var(--primary);color:#fff;font-weight:600;font-size:15px;transition:.15s}
.btn:hover{background:var(--primary-dark)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.ghost{background:var(--card);color:var(--text);border:1px solid var(--line)}
.btn.ghost:hover{background:var(--bg)}
.btn.sm{padding:6px 14px;font-size:14px;font-weight:500}
.btn.danger{background:var(--card);color:var(--err);border:1px solid #fecaca}
.btn.danger:hover{background:var(--err-soft)}
.tag{display:inline-block;padding:2px 9px;border-radius:6px;font-size:12px;font-weight:600;line-height:1.7}
.t-single{background:var(--primary-soft);color:var(--primary)}
.t-multi{background:#f3e8ff;color:#7e22ce}
.t-judge{background:var(--warn-soft);color:var(--warn)}
.sec-title{font-size:15px;font-weight:700;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.sec-title::before{content:"";width:3px;height:15px;background:var(--primary);border-radius:2px}
.lt{display:inline-block;width:19px;height:19px;line-height:19px;text-align:center;border-radius:5px;
  font-size:11px;font-weight:700;margin-right:3px}
.lt.g{background:var(--ok);color:#fff} .lt.r{background:var(--err);color:#fff}
.lt.y{background:var(--warn);color:#fff} .lt.n{background:#e5e7eb;color:#6b7280}

/* ---------- 首页 ---------- */
.hero{padding:40px 0 28px}
.hero h1{font-size:28px;margin-bottom:8px;letter-spacing:-.3px}
.hero p{color:var(--muted);font-size:15px}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:22px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.stat .n{font-size:26px;font-weight:700;line-height:1.2}
.stat .l{font-size:13px;color:var(--muted);margin-top:2px}
.opt-group{margin-bottom:20px}
.opt-group>label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:8px}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{padding:7px 15px;border-radius:8px;border:1px solid var(--line);background:var(--card);font-size:14px;transition:.15s}
.chip:hover{border-color:#c7d2fe}
.chip.on{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}
.home-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:18px;align-items:start}
.start-row{margin-top:22px;padding-top:20px;border-top:1px solid var(--line);display:flex;align-items:center;gap:14px}
.start-tip{font-size:13px;color:var(--muted)}
.rec{display:flex;justify-content:space-between;align-items:center;padding:9px 0;border-bottom:1px dashed var(--line);font-size:14px}
.rec:last-child{border:none}
.rec .sc{font-weight:700}
.sc.pass{color:var(--ok)} .sc.fail{color:var(--err)}

/* ---------- 答题页 ---------- */
.exam-head{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:60px;z-index:40}
.exam-head .wrap{display:flex;align-items:center;gap:14px;height:56px}
.clock{font-size:20px;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:.5px}
.clock.low{color:var(--err)}
.prog{flex:1;height:7px;background:var(--line);border-radius:4px;overflow:hidden;max-width:300px}
.prog i{display:block;height:100%;background:var(--primary);transition:.3s}
.exam-grid{display:grid;grid-template-columns:1fr 268px;gap:20px;align-items:start;padding:22px 0 40px}
.qcard{padding:26px}
.qhead{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.qno{font-size:15px;font-weight:700;color:var(--primary)}
.qtitle{font-size:17px;line-height:1.75;margin-bottom:20px;font-weight:500}
.opts{display:flex;flex-direction:column;gap:11px}
.opt{display:flex;align-items:flex-start;gap:12px;padding:13px 16px;border:1px solid var(--line);
  border-radius:10px;cursor:pointer;transition:.15s;background:var(--card)}
.opt:hover{border-color:#93b4fd;background:#fafcff}
.opt .ltr{width:26px;height:26px;flex:0 0 26px;border-radius:50%;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;color:var(--muted)}
.opt .txt{flex:1;padding-top:1px}
.opt.sel{border-color:var(--primary);background:var(--primary-soft)}
.opt.sel .ltr{background:var(--primary);border-color:var(--primary);color:#fff}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}
.opt.right .ltr{background:var(--ok);border-color:var(--ok);color:#fff}
.opt.bad{border-color:var(--err);background:var(--err-soft)}
.opt.bad .ltr{background:var(--err);border-color:var(--err);color:#fff}
.fb{margin-top:18px;padding:13px 16px;border-radius:10px;font-size:14px;font-weight:600}
.fb.ok{background:var(--ok-soft);color:var(--ok)}
.fb.no{background:var(--err-soft);color:var(--err)}
.fb.pt{background:var(--warn-soft);color:var(--warn)}
.qfoot{display:flex;align-items:center;gap:10px;margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}
.side{position:sticky;top:138px}
.sheet{padding:18px}
.sheet h4{font-size:14px;margin-bottom:12px;display:flex;justify-content:space-between;align-items:center}
.cells{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.cell{aspect-ratio:1;border-radius:7px;border:1px solid var(--line);background:var(--card);position:relative;
  display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--muted);transition:.12s}
.cell::after{content:"";position:absolute;left:3px;bottom:3px;width:5px;height:5px;border-radius:50%;background:#e5e7eb}
.cell.d1::after{background:var(--ok)} .cell.d2::after{background:var(--warn)} .cell.d3::after{background:var(--err)}

/* ---------- 难度星级 ---------- */
.star{display:inline-block;font-size:12.5px;letter-spacing:.5px;font-weight:700;cursor:help;margin-right:6px;white-space:nowrap}
.star.s1{color:var(--ok)} .star.s2{color:var(--warn)} .star.s3{color:var(--err)}
.cell:hover{border-color:var(--primary)}
.cell.done{background:var(--primary-soft);border-color:#bfdbfe;color:var(--primary);font-weight:600}
.cell.mark{background:var(--warn-soft);border-color:#fde68a;color:var(--warn);font-weight:700}
.cell.done.mark{background:var(--primary-soft);color:var(--primary);border-color:var(--warn);box-shadow:inset 0 0 0 2px var(--warn)}
.cell.cur{outline:2px solid var(--primary);outline-offset:1px;font-weight:700}
.legend{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:4px;vertical-align:-1px}
.legend i.mk{background:var(--primary-soft);border:2px solid var(--warn);width:13px;height:13px}

/* ---------- 成绩页 ---------- */
.score-card{display:flex;align-items:center;gap:34px;padding:30px;margin-bottom:20px;flex-wrap:wrap}
.ring{width:132px;height:132px;flex:0 0 132px;position:relative}
.ring svg{transform:rotate(-90deg)}
.ring .val{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.ring .val b{font-size:32px;line-height:1}
.ring .val span{font-size:12px;color:var(--muted)}
.kpis{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;flex:1;min-width:320px}
.kpi .n{font-size:22px;font-weight:700} .kpi .l{font-size:13px;color:var(--muted)}
.kpi.ok .n{color:var(--ok)} .kpi.err .n{color:var(--err)} .kpi.warn .n{color:var(--warn)}
.rev{padding:0;overflow:hidden}
.rev-item{border-bottom:1px solid var(--line);padding:16px 22px}
.rev-item:last-child{border:none}
.rev-q{display:flex;gap:10px;align-items:flex-start}
.rev-badge{flex:0 0 24px;height:24px;border-radius:6px;color:#fff;font-size:12px;font-weight:700;
  display:flex;align-items:center;justify-content:center;margin-top:2px}
.rev-badge.ok{background:var(--ok)} .rev-badge.err{background:var(--err)} .rev-badge.pt{background:var(--warn)}
.rev-body{flex:1;min-width:0}
.rev-title{font-size:15px;line-height:1.7}
.rev-ans{margin-top:9px;font-size:13.5px;display:flex;gap:18px;flex-wrap:wrap}
.rev-ans b{font-weight:600}
.ansline{display:inline-flex;gap:6px;align-items:center}
.olist{margin-top:10px;display:flex;flex-direction:column;gap:6px}
.oli{display:flex;gap:9px;align-items:flex-start;padding:7px 11px;border-radius:8px;font-size:14px;background:#fafbfc}
.oli.right{background:var(--ok-soft)}
.oli.bad{background:var(--err-soft)}

/* ---------- 错题本 ---------- */
.wb-item{padding:16px 22px;border-bottom:1px solid var(--line)}
.wb-item:last-child{border:none}
.wb-head{display:flex;align-items:center;gap:10px;margin-bottom:8px;flex-wrap:wrap}
.qid{font-size:12px;font-weight:700;color:var(--muted);background:var(--bg);
  border:1px solid var(--line);border-radius:6px;padding:1px 7px}
.wb-title{font-size:15.5px;line-height:1.7;margin-bottom:10px}
.wb-opts{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}
.wb-opts .oli{margin:0}
.wb-sum{display:flex;gap:16px;flex-wrap:wrap;font-size:13.5px;align-items:center}
.empty{text-align:center;padding:60px 20px;color:var(--muted)}
.empty .ic{font-size:44px;margin-bottom:10px;opacity:.35}
.sortbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap}

/* ---------- 管理页 ---------- */
.adm{display:grid;grid-template-columns:1fr 380px;gap:18px;align-items:start}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:6px}
.field input[type=text],.field textarea,.field select{
  width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:8px;outline:none;background:var(--card)}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--primary)}
.field textarea{min-height:80px;resize:vertical;line-height:1.6}
.optrow{display:flex;gap:8px;align-items:center;margin-bottom:8px}
.optrow .ltr2{flex:0 0 22px;font-weight:700;color:var(--muted)}
.optrow input{flex:1}
.optrow .pick{width:18px;height:18px;cursor:pointer}
.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th,.tbl td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{font-size:12px;color:var(--muted);font-weight:600}
.tbl tr:hover td{background:#fafbfc}
.tbl .ops{white-space:nowrap;text-align:right}
.search{display:flex;gap:8px;margin-bottom:14px}
.search input{flex:1;padding:9px 12px;border:1px solid var(--line);border-radius:8px;outline:none}
.search input:focus{border-color:var(--primary)}
.toast{position:fixed;left:50%;bottom:36px;transform:translateX(-50%);background:#111827;color:#fff;
  padding:11px 22px;border-radius:9px;font-size:14px;z-index:999;opacity:.96}
.login{max-width:340px;margin:80px auto;padding:28px}
.login h2{font-size:19px;margin-bottom:6px}
.login p{font-size:13px;color:var(--muted);margin-bottom:18px}

/* ---------- 部署教程页 ---------- */
.gd-form{display:grid;grid-template-columns:repeat(2,1fr);gap:0 18px}
.gd-form .field:last-child{display:flex;gap:8px;align-items:flex-end;flex-wrap:wrap}
.gd-form .field:last-child input{flex:1;min-width:160px}
.gd-layout{display:grid;grid-template-columns:240px 1fr;gap:20px;align-items:start}
.gd-side{position:sticky;top:80px}
.toc-item{display:flex;gap:9px;align-items:flex-start;padding:7px 9px;border-radius:8px;font-size:13.5px;
  cursor:pointer;color:var(--muted);line-height:1.5}
.toc-item:hover{background:var(--bg);color:var(--text)}
.toc-item.done{color:var(--ok)}
.toc-check{flex:0 0 18px;height:18px;border-radius:50%;background:var(--bg);border:1px solid var(--line);
  font-size:11px;display:flex;align-items:center;justify-content:center;margin-top:2px}
.toc-item.done .toc-check{background:var(--ok);border-color:var(--ok);color:#fff}
.gd-step{margin-bottom:18px;scroll-margin-top:80px}
.gd-head{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.gd-num{flex:0 0 30px;height:30px;border-radius:50%;background:var(--primary-soft);color:var(--primary);
  font-weight:700;display:flex;align-items:center;justify-content:center;font-size:14px}
.gd-num.done{background:var(--ok);color:#fff}
.gd-head h3{font-size:17px;font-weight:700}
.gd-body{font-size:14.5px;color:#374151;line-height:1.85}
.gd-body p{margin-bottom:8px}
.gd-ul{margin:6px 0 10px 20px}
.gd-ul li{margin-bottom:4px}
.gd-warn{background:var(--warn-soft);border-left:3px solid var(--warn);padding:8px 12px;border-radius:6px;font-size:13.5px}
.cmdwrap{margin:12px 0}
.cmdlabel{display:flex;justify-content:space-between;align-items:center;gap:10px;
  font-size:12.5px;color:var(--muted);margin-bottom:5px}
pre.cmd{background:#0f172a;color:#e2e8f0;padding:14px 16px;border-radius:9px;font-size:13px;line-height:1.7;
  overflow-x:auto;font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;white-space:pre;margin:0}
.gd-done{display:flex;align-items:center;gap:8px;margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);
  font-size:13.5px;color:var(--muted);cursor:pointer}
.gd-done input{width:16px;height:16px;cursor:pointer}
code{background:var(--bg);padding:1px 6px;border-radius:5px;font-size:13px;color:#be185d}

@media(max-width:900px){
  .gd-layout{grid-template-columns:1fr}
  .gd-side{position:static}
  .gd-form{grid-template-columns:1fr}
}

@media(max-width:900px){
  .home-grid,.exam-grid,.adm{grid-template-columns:1fr}
  .side{position:static;order:-1}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .kpis{grid-template-columns:repeat(3,1fr)}
  .cells{grid-template-columns:repeat(10,1fr)}
}