:root{
  --bg:#f4f5f8;--bg-2:#ffffff;--line:#e6e8ee;--panel:#ffffff;--panel-2:#f7f8fa;
  --text:#101828;--muted:#5d6b82;--primary:#2b4fd8;--primary-2:#1c3aa8;
  --ok:#13703f;--ok-bg:#e7f6ec;--ok-line:#bfe5cc;--bad:#b42318;--bad-bg:#fef3f2;--bad-line:#f2c6c2;
  --mark:#e0a030;--card:#ffffff;--ink:#101828;--ink-muted:#5d6b82;--ink-line:#e6e8ee;
  --surface:#ffffff;--surface-2:#f7f8fa;--surface-3:#f1f5f9;--line-2:#eef1f5;
  --ink-2:#475569;--ink-3:#334155;--topbar:rgba(255,255,255,.92);--grid-line:rgba(16,24,40,.028);--on-primary:#ffffff;--toast-bg:#101828;--toast-text:#ffffff;
}
html[data-theme="liantie-dark"]{
  --bg:#0d1422;--bg-2:#131c2b;--line:#263247;--panel:#161f31;--panel-2:#1b2537;
  --text:#eef3ff;--muted:#9aa8be;--primary:#5b7cff;--primary-2:#4463e0;
  --ok:#8ee0b0;--ok-bg:#12301f;--ok-line:#2f7d52;--bad:#ffb4ae;--bad-bg:#341614;--bad-line:#a34b45;
  --mark:#e0a030;--card:#161f31;--ink:#eef3ff;--ink-muted:#9aa8be;--ink-line:#263247;
  --surface:#161f31;--surface-2:#1b2537;--surface-3:#202b40;--line-2:#263247;
  --ink-2:#b6c2d6;--ink-3:#c9d4e6;--topbar:rgba(22,31,49,.92);--grid-line:rgba(160,190,255,.05);--on-primary:#0d1422;--toast-bg:#202b40;--toast-text:#eef3ff;
}
*{box-sizing:border-box}
html,body{margin:0}
body{
  min-height:100vh;color:var(--text);
  font:15px/1.55 "Instrument Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:
    linear-gradient(var(--grid-line) 1px,transparent 1px) 0 0/48px 48px,
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px) 0 0/48px 48px,
    var(--bg);
}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer}
.hidden{display:none !important}
kbd{display:inline-flex;align-items:center;justify-content:center;min-width:18px;height:18px;padding:0 5px;border-radius:4px;border:1px solid currentColor;font:11px/1 ui-monospace,SFMono-Regular,Menlo,monospace;opacity:.75}

/* 顶栏 */
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:18px;height:64px;padding:0 22px;background:var(--topbar);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand .logo{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--primary);color:var(--on-primary);font-size:20px;font-weight:900;flex:none;text-decoration:none}
.brand-text{min-width:0}
.brand-text h1{display:block;margin:0;font-size:14px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:34vw}
.brand-text h1 a{color:inherit;text-decoration:none}
.brand-text h1 a:hover{color:var(--primary)}
.brand-text small{display:block;margin-top:1px;color:var(--muted);font-size:11px}
.brand-text small a{color:inherit;text-decoration:none}
.brand-text small a:hover{color:var(--primary)}
.progress{flex:1;display:flex;gap:3px;max-width:420px;margin:0 auto}
.progress span{flex:1;height:4px;border-radius:999px;background:var(--line)}
.progress span.done{background:var(--primary)}
.progress span.cur{background:var(--text)}
.top-actions{display:flex;align-items:center;gap:8px;flex:none}
.pill{display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 12px;border-radius:999px;background:var(--panel-2);border:1px solid var(--line);font-size:12px;color:var(--text)}
.pill i{font-style:normal;color:var(--mark)}
.pill b{font-weight:700;font-variant-numeric:tabular-nums}
.pill.timer b{font-variant-numeric:tabular-nums}
.ghost{display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 12px;border-radius:999px;border:1px solid var(--line);background:transparent;color:var(--muted);font-size:12px}
.ghost:hover{color:var(--text);border-color:var(--line)}
.ghost.on{color:var(--on-primary);background:var(--primary);border-color:var(--primary)}
.btn.outline{background:var(--surface);border-color:var(--ink-line);color:var(--ink-2)}
.btn.outline:hover{border-color:var(--line);color:var(--ink)}
.ghost.icon{width:32px;padding:0;justify-content:center}

/* 布局 */
.layout{max-width:1320px;margin:0 auto;padding:22px;display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:20px;align-items:start}
.layout.results-mode{grid-template-columns:1fr}
.layout.results-mode .side{display:none}
.quiz-card{background:var(--card);color:var(--ink);border-radius:20px;padding:26px 30px 22px;min-height:520px;border:1px solid var(--line);box-shadow:0 10px 30px rgba(16,24,40,.06)}

/* 题头 */
.q-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.q-index{display:flex;align-items:baseline;gap:2px;font-family:"Noto Serif SC",Georgia,serif;font-weight:800}
.q-index b{font-size:52px;line-height:1;letter-spacing:-.03em;font-weight:800}
.q-index span{font-size:18px;color:var(--muted)}
.type-badge{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:6px;background:color-mix(in srgb, var(--primary) 12%, var(--surface));color:var(--primary);font-size:12px;font-weight:700}
.chapter-label{color:var(--ink-muted);font-size:12px;display:inline-flex;align-items:center;gap:6px;border:0;background:transparent;padding:2px 4px;border-radius:6px}
.chapter-label:hover{background:var(--surface-3);color:var(--ink-3)}
.q-tools{margin-left:auto;display:flex;gap:8px}
.chip{display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 12px;border-radius:8px;border:1px solid var(--ink-line);background:var(--surface);color:var(--ink-2);font-size:12px}
.chip:hover{border-color:var(--line);color:var(--ink)}
.chip.on{border-color:var(--mark);color:var(--mark);background:color-mix(in srgb, var(--mark) 16%, var(--surface))}

/* 题干与选项 */
.material{margin-top:14px;padding:14px 16px;border:1px solid var(--ink-line);border-radius:12px;background:var(--surface-2);color:var(--ink-3);font-size:14px;line-height:1.7}
.stem{margin:18px 0 20px;font-size:20px;font-weight:600;line-height:1.7;color:var(--ink)}
.opts{display:flex;flex-direction:column;gap:10px}
.opt{display:flex;align-items:center;gap:12px;width:100%;min-height:54px;padding:12px 16px;border:1px solid var(--ink-line);border-radius:12px;background:var(--surface);color:var(--ink);text-align:left;font-size:15px;transition:border-color .15s,background .15s}
.opt:hover{border-color:var(--line);background:var(--surface-2)}
.opt .k{display:grid;place-items:center;width:28px;height:28px;flex:none;border-radius:50%;border:1px solid var(--line);color:var(--muted);font-size:12px;font-weight:700}
.opt .txt{flex:1;min-width:0}
.opt .tag{flex:none;font-size:12px;color:var(--ink-muted)}
.opt.sel{border-color:var(--primary);background:color-mix(in srgb, var(--primary) 12%, var(--surface))}
.opt.sel .k{border-color:var(--primary);color:var(--primary)}
.opt.ok{border-color:var(--ok);background:var(--ok-bg)}
.opt.ok .k{border-color:var(--ok);background:var(--ok);color:var(--on-primary)}
.opt.ok .tag{color:var(--ok);font-weight:700}
.opt.bad{border-color:var(--bad);background:var(--bad-bg)}
.opt.bad .k{border-color:var(--bad);background:var(--bad);color:var(--on-primary)}
.opt.bad .tag{color:var(--bad);font-weight:700}
.opt:disabled{cursor:default;opacity:1}
.opt:disabled:hover{background:inherit}
.opt.ok:disabled:hover{background:var(--ok-bg)}
.opt.bad:disabled:hover{background:var(--bad-bg)}
textarea{width:100%;min-height:110px;border:1px solid var(--ink-line);border-radius:12px;padding:12px 14px;font:inherit;color:var(--ink);resize:vertical}
textarea:focus{outline:2px solid rgba(36,87,230,.35);outline-offset:1px;border-color:var(--primary)}
.hint{color:var(--ink-muted);font-size:12px;margin:10px 2px 0}
.sub-card{border:1px solid var(--ink-line);border-radius:14px;padding:16px;margin-bottom:12px}
.sub-card .sub-label{color:var(--ink-muted);font-size:12px;margin-bottom:6px}
.sub-card .stem{font-size:16px;margin:6px 0 12px}
.seq-box{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.seq-box .item{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--ink-line);border-radius:10px;background:var(--surface-2);font-size:13px}
.ord-actions{display:flex;gap:8px;margin-top:12px}

/* 反馈 */
.feedback{margin-top:18px;border:1px solid var(--ok-line);border-radius:14px;overflow:hidden;background:var(--ok-bg)}
.feedback.bad{border-color:var(--bad-line);background:var(--bad-bg)}
.feedback.manual{border-color:var(--line);background:var(--surface-2)}
.fb-head{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;padding:12px 16px;font-weight:700}
.fb-head .badge,.fb-head .ans,.fb-head .ai-tag{white-space:nowrap}
.fb-head .badge{display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:999px;background:var(--surface);font-size:13px;color:var(--ok)}
.feedback.bad .fb-head .badge{color:var(--bad)}
.feedback.manual .fb-head .badge{color:var(--ink-2)}
.fb-head .ans{font-weight:600;font-size:13px;color:var(--ink-3)}
.fb-head .ai-tag{font-size:10.5px;line-height:1;padding:3px 7px;border-radius:999px;background:color-mix(in srgb, var(--primary) 14%, var(--surface));color:var(--primary);font-weight:600;white-space:nowrap}
.fb-body{border-top:1px solid rgba(15,23,42,.08);background:var(--surface);padding:14px 16px;font-size:14px;line-height:1.8;color:var(--ink-3);white-space:pre-line}
.fb-body .section{margin-bottom:8px}
.fb-body .section:last-child{margin-bottom:0}
.fb-body .label{font-weight:700;color:var(--ink)}
.fb-tools{display:flex;gap:8px;margin-left:auto}
.fb-tools .chip{height:28px;font-size:12px}
.fb-collapsed{display:none}

/* 操作 */
.q-actions{display:flex;align-items:center;gap:10px;margin-top:22px;border-top:1px solid #eef1f5;padding-top:16px}
.spacer{flex:1}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 18px;border-radius:10px;border:1px solid transparent;font-size:14px;font-weight:700;white-space:nowrap}
.btn.primary{background:var(--primary);color:var(--on-primary)}
.btn.primary:hover{background:var(--primary-2)}
.btn.primary:disabled{background:var(--line);color:var(--muted);cursor:not-allowed}
.btn.ghost{background:var(--surface);border-color:var(--ink-line);color:var(--ink-2)}
.btn.ghost:hover{border-color:var(--line);color:var(--ink)}
.btn.ghost:disabled{color:var(--line);cursor:not-allowed}
.btn.outline{background:transparent;border-color:var(--ink-line);color:var(--text)}
.btn.outline:hover{border-color:var(--line)}
.btn.block{width:100%}

/* 侧栏 */
.side{display:flex;flex-direction:column;gap:16px}
.card-toggle{display:none}
.sheet-close{display:none}
.mobile-finish{display:none}
.sheet-backdrop{display:none}
.card-toggle b{font-weight:700;font-variant-numeric:tabular-nums;color:var(--primary)}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px}
@media(min-width:1024px){
  .side{position:sticky;top:80px;max-height:calc(100svh - 96px)}
  .side .panel{max-height:calc(100svh - 96px);overflow:auto}
}

.mode-switch{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:999px;background:var(--surface);padding:3px;gap:2px}
.mode-switch button{height:28px;padding:0 12px;border:0;border-radius:999px;background:transparent;color:var(--muted);font:inherit;font-size:12.5px;font-weight:600;cursor:pointer}
.mode-switch button.on{background:var(--primary);color:var(--on-primary)}
.mode-switch kbd{display:none}
.card-filters{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}
.card-filters button{height:28px;padding:0 10px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--muted);font:inherit;font-size:12px;cursor:pointer}
.card-filters button.on{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.card-page{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:10px;color:var(--muted);font-size:11.5px;font-variant-numeric:tabular-nums}
.card-page button{width:28px;height:28px;border-radius:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-size:14px;cursor:pointer}
.card-page button:disabled{opacity:.35;cursor:not-allowed}

.panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.panel-head h2{margin:0;font-size:15px;font-weight:700}
.panel-head .count{color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}
.cells{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.cell{position:relative;height:42px;border-radius:8px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink-2);font-size:12px;font-variant-numeric:tabular-nums;display:grid;place-items:center}
.cell:hover{border-color:var(--line)}
.cell.cur{border-color:var(--primary);color:var(--primary);background:var(--surface)}
.cell.ok{border-color:var(--ok-line);color:var(--ok);background:var(--ok-bg)}
.cell.bad{border-color:var(--bad-line);color:var(--bad);background:var(--bad-bg)}
.cell.m{border-color:var(--primary);color:var(--primary);background:color-mix(in srgb, var(--primary) 10%, var(--surface))}
.cell .dot{position:absolute;right:4px;top:4px;width:6px;height:6px;border-radius:50%;background:var(--mark)}
.legend{display:flex;gap:12px;margin-top:12px;color:var(--muted);font-size:11px;flex-wrap:wrap}
.legend i{display:inline-block;width:9px;height:9px;border-radius:2px;border:1px solid;margin-right:4px;vertical-align:-1px;font-style:normal}
.legend .ok{border-color:var(--ok)}.legend .bad{border-color:var(--bad)}.legend .mk{border-color:var(--mark)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:14px 0;padding:12px 0;text-align:center}
.stats b{display:block;font-size:20px;font-weight:800;font-variant-numeric:tabular-nums}
.stats span{display:block;color:var(--muted);font-size:11px;margin-top:2px}
.panel .btn.outline{height:40px}
.panel.cta h3{margin:0 0 6px;font-size:15px;font-weight:700}
.panel.cta p{margin:0 0 14px;color:var(--muted);font-size:12.5px;line-height:1.7}
.panel.cta .btn.primary{height:44px}

/* 快捷键条 */
.kbd-legend{max-width:1320px;margin:0 auto;padding:0 22px 30px;display:flex;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:11px;align-items:center}
.kbd-legend .item{display:inline-flex;align-items:center;gap:6px}
.kbd-legend .link{color:var(--primary);background:none;border:0;padding:0;font-size:11px}
.kbd-legend .link:hover{text-decoration:underline}

/* 开始/选择视图 */
.start-wrap{padding:8px 2px}
.start-wrap h2{margin:0 0 6px;font-size:20px;font-family:"Noto Serif SC",Georgia,serif}
.start-wrap p{margin:0 0 18px;color:var(--ink-muted);font-size:13px}
.unit-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.unit{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border:1px solid var(--ink-line);border-radius:12px;background:var(--surface);color:var(--ink);text-align:left}
.unit:hover{border-color:var(--line);background:var(--surface-2)}
.unit b{font-size:14px}
.unit span{color:var(--ink-muted);font-size:12px;font-variant-numeric:tabular-nums}

/* 结果 */
.result-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:20px}
.result-card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px;color:var(--text)}
.result-card.light{background:var(--surface);border-color:var(--ink-line);color:var(--ink)}
.result-label{color:var(--muted);font-size:12px;margin-bottom:14px}
.result-score{display:flex;align-items:baseline;gap:6px;font-family:"Noto Serif SC",Georgia,serif}
.result-score b{font-size:64px;line-height:1;letter-spacing:-.03em}
.result-score span{color:var(--muted);font-size:20px}
.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:22px;border-top:1px solid var(--line);padding-top:16px}
.result-stats b{display:block;font-size:18px;font-variant-numeric:tabular-nums}
.result-stats span{display:block;color:var(--muted);font-size:11px;margin-top:2px}
.type-rows{margin-top:6px}
.type-row{display:grid;grid-template-columns:64px 1fr 48px;align-items:center;gap:12px;margin:12px 0;font-size:12.5px;color:var(--ink-3)}
.type-row .bar{height:6px;border-radius:999px;background:var(--line-2);overflow:hidden}
.type-row .bar i{display:block;height:100%;border-radius:999px;background:var(--primary)}
.type-row .num{text-align:right;color:var(--ink-muted);font-variant-numeric:tabular-nums}
.result-foot{grid-column:1/-1;display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--surface);border-radius:18px;padding:18px 22px;color:var(--ink)}
.result-foot h3{margin:0 0 4px;font-size:15px}
.result-foot p{margin:0;color:var(--ink-muted);font-size:12px}
.result-foot .acts{display:flex;gap:10px;flex:none}
.result-foot .btn.ghost{height:40px}
.result-foot .btn.primary{height:40px}


/* 学习工具：错题本 / 模拟考试 */
.side-tools{display:flex;gap:8px;margin:0 0 12px}
.side-tools .btn{flex:1;height:36px;font-size:12.5px;padding:0 10px}
.side-tools b[hidden]{display:none}
.side-tools b{display:inline-grid;place-items:center;min-width:18px;height:18px;margin-left:4px;padding:0 5px;border-radius:999px;background:var(--bad);color:var(--on-primary);font-size:10.5px}
.info-view{max-width:1320px;margin:0 auto;padding:22px}
.info-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:16px}
.info-head h2{margin:0;font-size:24px;font-weight:900}
.info-head .ghost{height:34px;padding:0 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2)}
.info-meta{margin-left:auto;color:var(--muted);font-size:12.5px}
.wrong-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.wrong-tabs button{height:32px;padding:0 13px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);font-size:12.5px}
.wrong-tabs button.on{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.wrong-tabs b{font-weight:700;margin-left:4px}
.wrong-actions{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}
.wrong-actions .btn{height:38px;font-size:13px}
.wrong-list{display:flex;flex-direction:column;gap:8px}
.wrong-row{display:grid;grid-template-columns:auto minmax(0,1fr) auto auto;gap:12px;align-items:center;padding:13px 15px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.wrong-row .txt{min-width:0}
.wrong-row .txt b{display:block;font-size:14px;line-height:1.55;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.wrong-row .txt small{display:block;margin-top:3px;color:var(--muted);font-size:11.5px}
.wrong-row .num{color:var(--bad);font-size:12px;font-weight:700;white-space:nowrap}
.wrong-row .acts{display:flex;gap:6px}
.wrong-row .acts button{height:30px;padding:0 10px;border-radius:8px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink-2);font-size:12px}
.wrong-empty{padding:30px 20px;text-align:center;color:var(--muted);font-size:13.5px;border:1px dashed var(--line);border-radius:14px;background:var(--surface-2)}
.mock-intro{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:6px 0 12px}
.mock-intro>div,.mock-report-head>div{padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
.mock-k{display:block;color:var(--muted);font-size:11.5px;margin-bottom:6px}
.mock-intro b{font-size:26px;font-weight:800;font-variant-numeric:tabular-nums}
.mock-report-head{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:6px 0 14px}
.mock-report-head b{font-size:26px;font-weight:800;font-variant-numeric:tabular-nums}
.mock-wrong-list{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.mock-wrong-list .row{padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.mock-wrong-list .row b{display:block;font-size:13.5px;line-height:1.6;font-weight:600}
.mock-wrong-list .row small{display:block;margin-top:4px;color:var(--muted);font-size:11.5px}
@media(max-width:640px){
  .info-view{padding:14px}
  .info-head h2{font-size:20px}
  .mock-intro,.mock-report-head{grid-template-columns:repeat(2,1fr)}
  .wrong-row{grid-template-columns:auto minmax(0,1fr)}
  .wrong-row .num{grid-column:2}
  .wrong-row .acts{grid-column:2}
}

body.exam-mode .side-tools,body.exam-mode #finishBtn,body.exam-mode #finishBtnMobile,body.exam-mode .mobile-finish{display:none !important}
body.tools-mode .side,body.tools-mode .mobile-finish,body.tools-mode .kbd-legend,body.tools-mode .quiz-card{display:none !important}
body.tools-mode .mode-switch,body.tools-mode .pill.timer,body.tools-mode .pill.streak{display:none !important}
body.tools-mode .layout{grid-template-columns:1fr}

/* 弹层 */
.overlay{position:fixed;inset:0;z-index:60;display:flex;align-items:center;justify-content:center;padding:20px;background:rgba(4,9,15,.62);backdrop-filter:blur(4px)}
.modal{width:min(560px,100%);max-height:86vh;overflow:auto;background:var(--surface);color:var(--ink);border-radius:18px;padding:22px;box-shadow:0 30px 80px rgba(0,0,0,.4)}
.modal.head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.modal h3{margin:0;font-size:17px}
.modal .close{height:32px;padding:0 12px;border-radius:8px;border:1px solid var(--ink-line);background:var(--surface);color:var(--ink-2);font-size:12px}
.kbd-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px 22px;font-size:12.5px;color:var(--ink-3)}
.kbd-grid .row{display:flex;align-items:center;justify-content:space-between;gap:10px;border-bottom:1px solid #f1f5f9;padding:7px 0}
.kbd-grid kbd{color:var(--ink-3);border-color:var(--line)}
.modal p{color:var(--ink-2);line-height:1.7;font-size:13px}
.modal .acts{display:flex;gap:10px;margin-top:16px}
.modal .acts .btn{flex:1;height:42px}
.modal .acts .btn.ghost{border:1px solid var(--ink-line)}
.unit-list{margin-top:6px;max-height:52vh;overflow:auto}
.unit-list button{display:flex;width:100%;align-items:center;justify-content:space-between;gap:12px;border:0;border-bottom:1px solid #f1f5f9;background:var(--surface);padding:12px 4px;font-size:14px;color:var(--ink)}
.unit-list button:hover{color:var(--primary)}
.unit-list button.cur{color:var(--primary);font-weight:700}
.unit-list small{color:var(--ink-muted);font-size:12px;font-variant-numeric:tabular-nums}
#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:80;background:var(--toast-bg);border:1px solid var(--line);color:var(--toast-text);padding:10px 16px;border-radius:10px;font-size:13px;box-shadow:0 10px 30px rgba(16,24,40,.25)}

@media(max-width:1023px){
  .layout{grid-template-columns:1fr;padding:14px}
  .side{display:none}
  .card-toggle{display:inline-flex}
  .sheet-close{display:inline-flex;height:24px;padding:0 8px;font-size:11px}
  .side.open{display:block;position:fixed;z-index:70;left:0;right:0;bottom:0;max-height:78vh;overflow:auto;padding:0 12px 12px;background:transparent}
  .side.open .panel{border-radius:18px 18px 0 0;box-shadow:0 -18px 50px rgba(16,24,40,.22);max-height:78vh;overflow:auto;padding-bottom:18px}
  .sheet-backdrop.open{display:block;position:fixed;inset:0;z-index:65;background:rgba(16,24,40,.38)}
  .side #finishBtn{display:none}
  .mobile-finish{display:block;max-width:1320px;margin:0 auto 18px;padding:0 14px}
  .mobile-finish .btn{width:100%;height:46px}
  body.sheet-open{overflow:hidden}
  .quiz-card{padding:20px 18px;border-radius:16px;min-height:0}
  .q-index b{font-size:42px}
  .stem{font-size:17px;margin:14px 0 16px}
  .progress{display:none}
  .brand-text h1{max-width:46vw}
  .pill.streak{display:none}
  .kbd-legend{display:none}
  .q-tools{margin-left:0;width:100%;justify-content:flex-end}
  .result-grid{grid-template-columns:1fr}
  .result-foot{flex-direction:column;align-items:stretch}
  .result-foot .acts{justify-content:stretch}
  .result-foot .acts .btn{flex:1}
  .top-actions .ghost .label{display:none}
}
@media(max-width:560px){
  .topbar{height:64px;flex-wrap:nowrap;padding:0 12px;gap:8px}
  .brand{flex:1;min-width:0}
  .brand-text h1{max-width:46vw}
  .top-actions{width:auto;justify-content:flex-end;gap:6px;flex:none}
  #autoReadBtn,#helpBtn,#exitLink,#themeBtn,.pill.timer{display:none}
  .brand .logo{width:30px;height:30px;font-size:16px;border-radius:8px}
  .brand-text h1{max-width:none;font-size:12.5px}
  .brand-text small{display:none}
  .card-toggle .label{display:none}
  .fb-tools{margin-left:0;width:100%;justify-content:flex-end}
  .mode-switch{padding:2px}
  .mode-switch button{height:26px;padding:0 8px;font-size:11.5px}
  #accountLink{max-width:8em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .pill.timer{padding:0 9px}
  .card-toggle{padding:0 9px}
  .top-actions .ghost{padding:0 9px}
  .q-head{gap:8px}
  .q-index b{font-size:36px}
  .q-actions{flex-wrap:wrap;gap:8px}
  .q-actions .spacer{display:none}
  .q-actions .btn{flex:1 1 calc(50% - 4px);min-width:0;padding:0 12px}
  .q-actions #submitBtn,.q-actions #nextBtn{flex-basis:100%}
  .cells{grid-template-columns:repeat(5,1fr)}
}
@media(prefers-reduced-motion:reduce){*{transition:none !important;scroll-behavior:auto !important}}