:root{
  --background:#f5f7fb;
  --foreground:#07111f;
  --card:#ffffff;
  --surface:#fbfcfe;
  --surface-soft:#f7f9fc;
  --primary:#2563eb;
  --primary-strong:#1d4ed8;
  --primary-foreground:#ffffff;
  --secondary:#f1f5f9;
  --muted:#f8fafc;
  --muted-foreground:#6b7b8f;
  --subtle:#98a6b8;
  --accent:#eff6ff;
  --accent-foreground:#1d4ed8;
  --destructive:#e11d48;
  --success:#16a34a;
  --warning:#f59e0b;
  --border:#dfe7f0;
  --border-strong:#c9d6e5;
  --input:#cbd7e6;
  --radius:14px;
  --shadow-xs:0 1px 2px rgba(15,23,42,.035);
  --shadow-sm:0 4px 14px rgba(15,23,42,.045);
  --shadow-card:0 18px 44px rgba(15,23,42,.075);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  min-height:100vh;
  overflow:hidden;
  background:linear-gradient(180deg,#fbfcfe 0%,var(--background) 100%);
  color:var(--foreground);
  font-family:var(--font);
  font-size:14px;
  line-height:1.45;
}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.app-shell{
  width:min(1500px,calc(100vw - 32px));
  height:100vh;
  margin:0 auto;
  padding:12px 0;
  display:grid;
  grid-template-rows:auto minmax(0,1fr);
  gap:10px;
}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-xs)}
.topbar{display:grid;grid-template-columns:minmax(220px,1fr) 330px 360px;gap:12px;align-items:end}
.eyebrow{font-size:11px;color:var(--primary);font-weight:700;letter-spacing:.08em;text-transform:uppercase}
.topbar h1{margin:4px 0 2px;font-size:25px;line-height:1.05;letter-spacing:-.04em;color:#0f172a;font-weight:800}
.topbar p{margin:0;color:var(--muted-foreground);font-size:13px}
label{display:block;margin:0 0 5px;font-size:12px;font-weight:600;color:var(--muted-foreground)}
input,select,textarea{width:100%;border:1px solid var(--input);background:#fff;border-radius:10px;outline:none;transition:border-color .16s ease,box-shadow .16s ease}
input,select{height:36px;padding:0 10px}
textarea{padding:10px 12px;min-height:130px;resize:vertical;line-height:1.65}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.10)}
.bank-switcher{padding:10px;display:grid;grid-template-columns:1fr auto;gap:8px;align-items:end;background:#fff}
.bank-switcher label{grid-column:1/-1;margin:0}
.btn{height:36px;border-radius:10px;padding:0 11px;border:1px solid var(--border);background:#fff;color:var(--foreground);font:inherit;cursor:pointer;transition:background .15s ease,border-color .15s ease,box-shadow .15s ease,transform .15s ease;white-space:nowrap}
.btn:hover{background:var(--secondary);border-color:var(--border-strong)}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:700;box-shadow:0 8px 18px rgba(37,99,235,.16)}
.btn.primary:hover{background:var(--primary-strong);transform:translateY(-1px)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;background:#fff}
.quick-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.quick-stats div{padding:9px 11px;background:#fff;border:1px solid var(--border);border-radius:12px;text-align:left}
.quick-stats b{display:block;font-size:20px;line-height:1;color:#0f172a}
.quick-stats span{display:block;margin-top:4px;font-size:12px;color:var(--muted-foreground)}
.quick-stats .danger b{color:var(--destructive)}
.layout{min-height:0;display:grid;grid-template-columns:220px minmax(0,1fr);gap:12px;align-items:stretch}
.sidebar{padding:12px;min-height:0;overflow:hidden;background:#fcfdff;border-color:#e5ecf4;box-shadow:none}
.side-section+.side-section{margin-top:11px;padding-top:11px;border-top:1px solid var(--border)}
.side-section h2{margin:0 0 9px;font-size:13px;color:#475569;font-weight:700}
.two-cols{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:8px}
.jump-row{display:grid;grid-template-columns:1fr 60px;gap:7px}
.side-actions{display:grid;gap:7px;margin-top:7px}
.side-actions .btn{height:33px;color:#475569}
.muted-btn{color:#64748b!important}
.legend{display:flex;flex-wrap:wrap;gap:9px;font-size:12px;color:var(--muted-foreground)}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px}.dot.done{background:var(--success)}.dot.wrong{background:var(--destructive)}.dot.star{background:var(--warning)}
.shortcut-mini{margin-top:9px;padding:8px 9px;border-radius:10px;background:#f6f8fb;display:grid;gap:2px;font-size:12px;color:var(--muted-foreground)}
.shortcut-mini b{color:#475569}
.content{min-width:0;min-height:0;display:grid;grid-template-rows:5px minmax(0,1fr);gap:10px}
.progress-wrap{height:5px;background:#e5ebf3;border-radius:999px;overflow:hidden}
#progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--primary),#7db3ff);transition:width .28s ease}
.quiz-grid{height:100%;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) 400px;gap:12px;align-items:stretch;animation:cardIn .22s ease}
.quiz-grid.switching{animation:cardSwitch .20s ease}
@keyframes cardIn{from{opacity:.64;transform:translateY(4px)}to{opacity:1;transform:none}}
@keyframes cardSwitch{from{opacity:.45;transform:translateY(6px)}to{opacity:1;transform:none}}
.question-pane,.answer-pane,.nav-panel{background:#fff;border:1px solid var(--border);border-radius:var(--radius)}
.question-pane{padding:24px 26px 20px;min-height:0;display:flex;flex-direction:column;border-color:#d9e5f3;box-shadow:var(--shadow-card);overflow:auto;background:linear-gradient(180deg,#ffffff 0%,#fcfdff 100%)}
.right-rail{display:grid;grid-template-rows:auto minmax(0,1fr);gap:10px;min-height:0}
.answer-pane{padding:14px;background:#fff;box-shadow:var(--shadow-xs)}
.answer-pane-inner{min-height:0}
.question-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start}
.type-pill{display:inline-flex;align-items:center;height:24px;padding:0 9px;border-radius:999px;background:#eef5ff;color:var(--primary-strong);font-size:12px;font-weight:700;margin-bottom:9px}
.question-head h2{margin:0;font-size:34px;line-height:1.08;letter-spacing:-.052em;color:#020617;font-weight:850}
.star-btn{height:36px;background:#fff}
.meta-line{display:flex;gap:10px;align-items:center;margin:9px 0 13px;color:#738195;font-size:12px}
.meta-line:before{content:"当前题";display:inline-flex;height:21px;align-items:center;border-radius:999px;padding:0 8px;background:#f2f5fa;color:#5b6a7d;font-weight:700;flex:0 0 auto}
.question-text{padding:18px 20px;border-radius:13px;background:#f7f9fc;border:1px solid #d8e3ef;font-size:21px;line-height:1.72;color:#07111f;font-weight:760;letter-spacing:-.015em;white-space:pre-wrap;word-break:break-word}
.option-list{display:grid;gap:9px;margin-top:14px}
.option{display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:center;text-align:left;min-height:47px;padding:10px 13px;border:1px solid #dfe7f0;border-radius:12px;background:#fff;cursor:pointer;color:#172033;transition:border-color .15s ease,background .15s ease,box-shadow .15s ease,transform .15s ease}
.option:hover{border-color:#b9c9dc;background:#fbfdff}
.option .label{display:inline-flex;align-items:center;justify-content:center;width:29px;height:29px;border-radius:9px;background:#eef2f7;color:#334155;font-size:13px;font-weight:800}
.option .text{line-height:1.55;white-space:pre-wrap}
.option.selected{border-color:#3b82f6;box-shadow:0 0 0 3px rgba(59,130,246,.10);background:#f6f9ff}
.option.selected .label{background:var(--primary);color:#fff}
.option.correct{border-color:#86d7a8;background:#f0fdf4}.option.correct .label{background:var(--success);color:#fff}
.option.wrong{border-color:#f7b8c2;background:#fff1f2}.option.wrong .label{background:var(--destructive);color:#fff}
.submit-wrap{margin-top:12px}.submit-wrap .btn{min-width:116px}
.answer-area{margin-top:14px;padding:14px;border:1px solid var(--border);border-radius:12px;background:#f9fbfe}
.answer-area .btn{margin-top:10px}
.hint-line,.mapping-options-title,.logic-note,.result-meta{color:var(--muted-foreground);font-size:12px;line-height:1.55}
.mapping-fields{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0}
.mapping-field label{display:flex;justify-content:space-between;gap:8px;margin:0 0 6px;font-size:13px;color:#172033}
.mapping-field label span{font-size:12px;color:var(--muted-foreground)}
.mapping-field input{text-align:center;font-weight:700}
.mapping-options{display:grid;grid-template-columns:repeat(2,1fr);gap:7px;margin-top:7px}
.mapping-option{display:grid;grid-template-columns:30px 1fr;gap:8px;text-align:left;padding:8px;border-radius:10px;border:1px solid var(--border);background:#fff;cursor:pointer}
.mapping-option:hover{background:#fbfdff;border-color:#b9c9dc}
.mapping-option b{display:flex;align-items:center;justify-content:center;border-radius:8px;background:#eef2f7;color:#334155;font-size:12px}
.mapping-option span{line-height:1.45;font-size:12px}
.action-row{display:flex;justify-content:center;gap:10px;margin-top:auto;padding-top:14px}
.action-row .btn{min-width:104px}.action-row .primary{min-width:116px}
.answer-empty{padding:15px;border:1px solid #dce6f1;border-radius:12px;background:#f9fbfe;text-align:left}.answer-empty b{display:block;font-size:17px;margin-bottom:6px;color:#172033}.answer-empty span{display:block;color:var(--muted-foreground);line-height:1.58}
.result-panel{padding:15px;border:1px solid #dce6f1;border-radius:12px;background:#f9fbfe;animation:cardIn .18s ease;max-height:38vh;overflow:auto}.result-panel.good{border-color:#9fdfb9;background:#f0fdf4}.result-panel.bad{border-color:#f5b8c0;background:#fff1f2}
.answer-line{font-size:16px;font-weight:800;margin-bottom:8px;color:#172033}.explain,.ref-answer,.your-answer{white-space:pre-wrap;line-height:1.65;margin-top:10px}.result-meta{margin-top:10px}.self-grade{display:grid;grid-template-columns:1fr 1fr;gap:8px;align-items:center;margin-top:10px}.self-grade span{grid-column:1/-1;color:var(--muted-foreground);font-size:12px}.self-grade .ok{background:#f0fdf4;border-color:#bbf7d0;color:#15803d}.self-grade .bad{background:#fff1f2;border-color:#fecdd3;color:#be123c}
.logic-note{margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}
.nav-panel{padding:13px;min-height:0;overflow:hidden;background:#fff;box-shadow:var(--shadow-xs)}
.nav-head{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;margin-bottom:9px}
.nav-head h3{margin:0;font-size:16px;color:#172033}.nav-head p{margin:3px 0 0;color:var(--muted-foreground);font-size:12px}
.nav-actions{display:flex;align-items:center;gap:5px;color:var(--muted-foreground);font-size:12px;white-space:nowrap}.nav-actions .btn{height:29px;padding:0 8px}
.question-grid{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:7px}.qcell{height:31px;border-radius:8px;border:1px solid var(--border);background:#fff;color:#475569;font-size:12px;padding:0;transition:background .14s ease,border-color .14s ease,transform .14s ease}.qcell:hover{background:#fbfdff;border-color:#b9c9dc;transform:translateY(-1px)}.qcell.current{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:800;box-shadow:0 5px 14px rgba(37,99,235,.20)}.qcell.done{border-color:#bbf7d0;background:#f0fdf4}.qcell.wrong{background:#fff1f2;border-color:#fecdd3;color:#be123c}.qcell.starred{box-shadow:inset 0 0 0 2px rgba(245,158,11,.45)}
.hidden{display:none!important}
@media(max-width:1180px){body{overflow:auto}.app-shell{height:auto}.topbar{grid-template-columns:1fr}.quick-stats{grid-template-columns:repeat(4,1fr)}.layout{grid-template-columns:1fr}.quiz-grid{grid-template-columns:1fr;height:auto}.sidebar{overflow:visible}.right-rail{grid-template-rows:auto auto}.question-grid{grid-template-columns:repeat(10,1fr)}.result-panel{max-height:none}}
@media(max-width:960px){.app-shell{width:calc(100vw - 28px);padding:16px 0}.topbar h1{font-size:28px}.quick-stats{grid-template-columns:repeat(2,1fr)}.two-cols{grid-template-columns:1fr}.question-head h2{font-size:28px}.question-text{font-size:18px}.mapping-fields,.mapping-options{grid-template-columns:1fr}.question-grid{grid-template-columns:repeat(6,1fr)}}