:root{
  --paper:#ffffff;
  --paper-2:#ffffff;
  --paper-3:#ffffff;
  --ink:#171613;
  --ink-2:#33302b;
  --muted:#888176;
  --muted-2:#b4ac9f;
  --line:rgba(23,22,19,.15);
  --line-2:rgba(23,22,19,.32);
  --line-3:rgba(23,22,19,.68);
  --red:#b13a2b;
  --red-2:#d95643;
  --red-wash:rgba(177,58,43,.08);
  --green:#42624d;
  --hover-grey:#ececec;
  --serif:"vivo Sans","vivo Sans Bold","Noto Sans SC","Microsoft YaHei",sans-serif;
  --sans:"vivo Sans","Noto Sans SC","Microsoft YaHei","PingFang SC",sans-serif;
  --mono:"Cascadia Mono","SFMono-Regular",Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow:0 22px 60px rgba(36,30,22,.10);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;min-height:100%}
body{
  color:var(--ink);
  background:#ffffff;
  font-family:var(--sans);
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.exam-mode{overflow:hidden}
body.exam-mode #topbar{display:none}
body.exam-mode #view{min-height:100vh}
body.scan-page-mode{overflow:hidden}
body.scan-page-mode #topbar{display:flex}
body.scan-page-mode #view{height:calc(100vh - 92px);min-height:calc(100vh - 92px)}
body[data-motion="off"] .book-page{animation:none}
button{font:inherit;color:inherit;border:0;background:none;padding:0;cursor:pointer}
[hidden]{display:none !important}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
input,select{font:inherit;color:inherit}
::selection{background:var(--red);color:#fff}

#grain{
  display:none;
}

/* ---------------- 顶栏 ---------------- */
#topbar{
  position:relative;z-index:30;height:92px;padding:0 46px;
  display:flex;align-items:center;justify-content:space-between;
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:16px}
.brand-cn{font-family:var(--serif);font-size:22px;font-weight:900;letter-spacing:.16em}
.top-right{display:flex;align-items:center;gap:26px}
.today{font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--muted)}
.due-pill{
  display:inline-flex;align-items:center;gap:8px;font-size:11px;letter-spacing:.1em;
  color:var(--muted);border-bottom:1px solid transparent;padding:4px 0;transition:.25s var(--ease);
}
.due-pill b{font-family:var(--serif);font-size:18px;color:var(--red);font-weight:700}
.due-pill:hover{color:var(--ink);border-color:var(--ink)}

/* ---------------- 通用 ---------------- */
#view{position:relative;z-index:1;min-height:calc(100vh - 92px)}
.page{max-width:1320px;margin:0 auto;padding:54px 46px 120px}
.book-page{animation:book-page-in 1.02s var(--ease) both}
@keyframes book-page-in{
  from{opacity:0;transform:translateY(9px)}
  to{opacity:1;transform:none}
}
.scan-page{
  height:calc(100vh - 92px);max-width:1320px;padding:18px 46px 0;
  display:flex;flex-direction:column;overflow:hidden;
}
.scan-utility-bar{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);
  align-items:center;column-gap:30px;
  min-height:36px;flex:0 0 auto;
}
.scan-utility-bar .back{margin:0}
.scan-mini-identity{
  grid-column:1;justify-self:end;display:flex;align-items:center;gap:16px;
  margin-left:0;position:relative;top:-20px;font-size:9px;color:var(--muted);
}
.scan-mini-identity strong{font-family:var(--serif);font-size:12px;letter-spacing:.14em;color:var(--ink)}
.scan-mini-identity a{display:inline-flex;align-items:center;gap:5px;white-space:nowrap}
.scan-mini-identity a b{font-family:var(--serif);font-size:13px;color:var(--red)}
.scan-mini-user i{
  width:22px;height:22px;display:grid;place-items:center;border-radius:50%;
  background:var(--ink);color:#fff;font-style:normal;font-size:9px;
}
.page-head{
  display:grid;grid-template-columns:1fr auto;align-items:end;gap:24px;
  border-bottom:1px solid var(--ink);padding-bottom:24px;margin-bottom:30px;
}
.page-head .lead{display:flex;align-items:baseline;gap:22px}
.page-head h1{
  margin:0;font-family:var(--serif);font-weight:700;font-size:clamp(40px,5vw,68px);
  line-height:.95;letter-spacing:-.04em;
}
.page-head .sub{font-size:11px;letter-spacing:.24em;color:var(--muted)}
.book-switcher{display:flex;align-items:center;gap:8px;align-self:end}
.book-switcher .ghost-btn{text-decoration:none}
.scan-page-head{padding-bottom:14px;margin-bottom:18px;flex:0 0 auto}
.scan-page-head h1{font-size:clamp(32px,3.8vw,48px)}
.scan-title-lead{position:relative}
.scan-title-trigger{display:inline-block;cursor:default}
.scan-layout.has-result .scan-title-trigger{transition:transform .9s var(--ease)}
.scan-layout.has-result .scan-title-trigger.pointer-active{transform:translateX(16px);cursor:none}
.scan-layout.has-result .scan-title-lead .sub{
  max-width:90px;overflow:hidden;white-space:nowrap;
  transition:opacity .54s,transform .81s var(--ease),max-width .81s var(--ease);
}
.scan-layout.has-result .scan-title-lead.title-hover .sub{
  opacity:0;transform:translateX(16px);max-width:0;
}
.scan-pointer-cursor{
  position:fixed;left:0;top:0;z-index:300;width:84px;height:62px;
  isolation:isolate;pointer-events:none;
  opacity:0;visibility:hidden;will-change:transform;
  transition:opacity .16s ease,visibility .16s ease;
}
.scan-pointer-cursor.on{opacity:1;visibility:visible}
.scan-pointer-field{
  position:absolute;left:6px;right:6px;top:6px;bottom:6px;
  overflow:hidden;background:#111;
}
.scan-pointer-title{
  position:absolute;left:0;top:0;color:#fff;white-space:nowrap;
  font-family:var(--serif);font-weight:700;
  font-size:clamp(32px,3.8vw,48px);line-height:.95;letter-spacing:-.04em;
}
.scan-pointer-frame,
.scan-pointer-lines{
  position:absolute;inset:0;width:84px;height:62px;
}
.scan-pointer-frame{color:#6f6f6f}
.scan-pointer-lines{
  color:#fff;
  mix-blend-mode:difference;
}
.page-no{
  font-family:var(--serif);font-size:clamp(54px,7vw,96px);line-height:.8;color:transparent;
  -webkit-text-stroke:1px var(--line-2);letter-spacing:-.04em;
}
.back{
  display:inline-flex;align-items:center;gap:10px;font-size:11px;letter-spacing:.16em;
  color:var(--muted);margin-bottom:34px;transition:.2s;
}
.back::before{content:"";width:34px;height:1px;background:var(--line-2);transition:.2s}
.back:hover{color:var(--ink)}
.back:hover::before{width:48px;background:var(--ink)}
.micro{font-size:10.5px;letter-spacing:.18em;color:var(--muted);text-transform:uppercase}
.rule{height:1px;background:var(--line);border:0;margin:0}
.primary-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:46px;padding:0 22px;background:var(--ink);color:#fff;
  border:1px solid var(--ink);font-size:12px;letter-spacing:.1em;
  transition:.25s var(--ease);
}
.primary-btn:hover{background:var(--red);border-color:var(--red);transform:translateY(-1px)}
.primary-btn:disabled{opacity:.35;cursor:not-allowed;transform:none}
.ghost-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;
  padding:0 16px;border:1px solid var(--line-2);font-size:11.5px;color:var(--ink);
  background:transparent;transition:.2s;
}
.ghost-btn:hover{border-color:var(--ink);background:rgba(255,255,255,.55)}
.ghost-btn.on{background:var(--ink);border-color:var(--ink);color:#fff}
.danger-btn{color:var(--red);border-color:rgba(177,58,43,.35)}
.danger-btn:hover{background:var(--red);border-color:var(--red);color:#fff}
.icon-btn{
  width:38px;height:38px;display:inline-grid;place-items:center;border:1px solid var(--line);
  background:var(--paper-3);transition:.2s;
}
.icon-btn:hover{border-color:var(--ink);background:#fff}
.icon-btn svg{width:16px;height:16px}

/* ---------------- 首页 ---------------- */
.home{
  max-width:1320px;margin:0 auto;padding:42px 46px 90px;
  display:grid;grid-template-columns:minmax(0,1.18fr) minmax(360px,.82fr);
  gap:70px;align-items:start;min-height:calc(100vh - 92px);
}
.home-left{position:relative;padding-top:24px}
.home-kicker{display:flex;align-items:center;gap:14px;margin-bottom:30px}
.home-kicker::before{content:"";width:42px;height:1px;background:var(--ink)}
.home-kicker span{font-size:10px;letter-spacing:.3em;color:var(--muted)}
.home h1{
  margin:0;font-family:var(--serif);font-weight:700;
  font-size:clamp(56px,7.4vw,118px);line-height:.96;letter-spacing:-.055em;
}
.home h1 .line{display:block;white-space:nowrap}
.home h1 .red{color:var(--red)}
.home-lede{
  margin:34px 0 0;max-width:490px;font-family:var(--serif);font-size:16px;
  line-height:2;color:var(--ink-2);letter-spacing:.02em;
}
.home-meta{
  display:flex;gap:34px;margin-top:48px;padding-top:20px;border-top:1px solid var(--line);
  max-width:520px;
}
.home-meta b{display:block;font-family:var(--serif);font-size:27px;font-weight:700;line-height:1}
.home-meta span{display:block;margin-top:8px;font-size:9.5px;letter-spacing:.2em;color:var(--muted)}
.home-ghost{
  position:absolute;right:-20px;bottom:-140px;z-index:-1;font-family:var(--serif);
  font-size:clamp(260px,35vw,520px);line-height:.8;color:transparent;
  -webkit-text-stroke:1px rgba(23,22,19,.07);pointer-events:none;user-select:none;
}
.doors{display:flex;flex-direction:column;border-top:1px solid var(--ink);margin-top:20px}
.door{
  position:relative;display:grid;grid-template-columns:48px minmax(0,1fr) 74px;
  gap:22px;align-items:center;text-align:left;padding:28px 4px 30px;
  border-bottom:1px solid var(--line-2);overflow:hidden;transition:.35s var(--ease);
}
.door::before{
  content:"";position:absolute;inset:0;background:var(--hover-grey);transform:scaleY(.2);
  transform-origin:bottom;opacity:0;transition:.35s var(--ease);z-index:-1;
}
.door>*{transition:transform .35s var(--ease)}
.door:hover{border-color:var(--ink)}
.door:hover>*{transform:translateX(12px)}
.door:hover::before{opacity:1;transform:scaleY(1)}
.door-no{font-family:var(--mono);font-size:10px;color:var(--muted);letter-spacing:.12em;align-self:start;padding-top:8px}
.door-title{font-family:var(--serif);font-size:clamp(26px,2.8vw,38px);font-weight:700;line-height:1.1;letter-spacing:-.02em}
.door-desc{margin-top:10px;font-size:11.5px;line-height:1.8;color:var(--muted);letter-spacing:.04em}
.door-art{width:74px;height:58px;justify-self:end;color:var(--ink);opacity:.75;transition:.35s}
.door:hover .door-art{opacity:1;transform:translateX(4px)}
.door.future{opacity:.45}
.door.future:hover{opacity:.7}
.door-tag{
  display:inline-block;margin-top:10px;font-size:8.5px;letter-spacing:.22em;
  color:var(--red);border:1px solid rgba(177,58,43,.4);padding:2px 7px;
}
.home-foot{
  display:flex;justify-content:space-between;align-items:center;margin-top:34px;
  font-size:9px;letter-spacing:.2em;color:var(--muted);
}

/* ---------------- 题目正文 ---------------- */
.qbody{font-family:var(--serif);color:var(--ink-2)}
.shared-stem{
  margin:0 0 22px;padding:18px 20px;border-left:3px solid var(--ink);
  background:rgba(255,255,255,.5);font-size:15px;line-height:1.95;
}
.shared-stem .micro{margin-bottom:8px;font-family:var(--sans)}
.qtext{font-size:17px;line-height:2.02;letter-spacing:.005em;word-break:break-word}
.qtext p{margin:0}
.qfigs{display:flex;flex-wrap:wrap;gap:14px;margin:20px 0 4px}
.qfigs img{
  max-width:min(100%,520px);max-height:400px;object-fit:contain;
  border:1px solid var(--line);background:#fff;
}
.inline-fig{height:1.42em;vertical-align:-.28em;display:inline-block;margin:0 2px}
.formula-gap{
  display:inline-block;padding:0 5px;margin:0 1px;border:1px dashed var(--line-2);
  color:var(--muted);font-family:var(--sans);font-size:10px;line-height:1.5;vertical-align:1px;
}
.qopts{list-style:none;margin:20px 0 0;padding:0}
.qopts li{
  position:relative;padding-left:30px;font-size:16px;line-height:1.95;
  color:var(--ink-2);min-height:32px;
}
.qopts li + li{margin-top:7px}
.qopts li .letter{
  position:absolute;left:0;top:.2em;width:21px;height:21px;display:grid;place-items:center;
  border:1px solid var(--line-2);font-family:var(--sans);font-size:10px;font-weight:700;
}
.qopts.cols{display:grid;grid-template-columns:1fr 1fr;gap:4px 26px}
.qopts.cols li + li{margin-top:0}
.opt-photos{display:flex;gap:8px;margin-top:6px}
.opt-photos img{max-width:140px;max-height:110px;object-fit:contain;border:1px solid var(--line)}
.part-opts{margin-top:24px;padding-top:18px;border-top:1px dashed var(--line-2)}
.part-opts .part-label{font-family:var(--sans);font-size:9.5px;letter-spacing:.2em;color:var(--muted);margin-bottom:8px}
.q-meta{display:flex;flex-wrap:wrap;align-items:center;gap:7px;font-family:var(--sans)}
.q-src{font-size:11px;font-weight:700;letter-spacing:.03em}
.q-no{font-family:var(--mono);font-size:9px;color:var(--muted);letter-spacing:.08em;margin-left:4px}
.chip{
  display:inline-flex;align-items:center;min-height:21px;padding:1px 7px;
  background:rgba(23,22,19,.055);color:var(--ink-2);font-size:9.5px;letter-spacing:.05em;
}
.chip.dark{background:var(--ink);color:#fff}
.chip.red{background:var(--red-wash);color:var(--red);font-weight:700}
.chip.line{background:transparent;border:1px solid var(--line)}
.tags-row{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}

.answer-block{
  margin-top:34px;padding-top:28px;border-top:1px solid var(--ink);
}
.answer-head{display:flex;align-items:center;gap:12px;margin-bottom:18px}
.answer-head .micro{color:var(--red)}
.answer-head::after{content:"";flex:1;height:1px;background:var(--line)}
.analysis{
  font-family:var(--serif);font-size:15.5px;line-height:2.02;color:var(--ink-2);
  word-break:break-word;
}
.analysis .katex{font-size:1.02em}
.analysis:empty::before{content:"这道题暂时没有解析。";color:var(--muted)}
.answer-only{
  display:flex;flex-direction:column;align-items:flex-start;gap:12px;padding:8px 0 4px;
}
.answer-only b{
  font-family:var(--serif);font-size:48px;line-height:1;color:var(--red);
  letter-spacing:-.03em;
}
.answer-only p{margin:0;font-size:11.5px;line-height:1.9;color:var(--muted)}

/* ---------------- 扫描 ---------------- */
.scan-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:30px;align-items:start}
.scan-layout{
  flex:1;height:100%;min-height:0;align-items:stretch;
}
.scan-layout.has-result{grid-template-columns:minmax(0,1fr) minmax(0,2fr);align-items:stretch}
.scan-left-column{
  width:100%;height:100%;min-width:0;min-height:0;display:flex;flex-direction:column;
}
.scan-left-column #scanArea{
  width:100%;min-width:0;height:0;min-height:0;flex:1;display:flex;flex-direction:column;
}
.dropzone{
  position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;
  min-height:430px;border:1px solid var(--line-2);background:rgba(255,255,255,.38);
  border-radius:0;cursor:pointer;overflow:hidden;transition:.3s var(--ease);
}
.dropzone::before,.dropzone::after{
  content:"";position:absolute;width:44px;height:44px;border-color:var(--ink);border-style:solid;
  transition:.3s;
}
.dropzone::before{left:18px;top:18px;border-width:1px 0 0 1px}
.dropzone::after{right:18px;bottom:18px;border-width:0 1px 1px 0}
.dropzone:hover{border-color:var(--ink);background:rgba(255,255,255,.68)}
.dropzone:hover::before{left:22px;top:22px}
.dropzone:hover::after{right:22px;bottom:22px}
.dropzone input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.drop-icon{width:92px;height:92px;margin-bottom:28px;color:var(--ink);opacity:.7}
.drop-title{font-family:var(--serif);font-size:40px;font-weight:700;letter-spacing:-.03em}
.drop-sub{margin-top:14px;font-size:11px;letter-spacing:.12em;color:var(--muted)}
.drop-cta{
  display:inline-flex;align-items:center;gap:10px;padding:12px 22px;
  border:1px solid var(--ink);font-size:11.5px;letter-spacing:.12em;background:var(--paper-3);
  border-radius:0;cursor:pointer;white-space:nowrap;transition:.2s;
}
.drop-cta::after{content:"→"}
.drop-cta:hover{background:var(--ink);color:#fff}
.drop-actions{display:flex;gap:10px;margin-top:30px;flex-wrap:wrap;justify-content:center}
.scan-preview-modal{width:min(860px,100%)}
.scan-preview-modal img{
  width:100%;max-height:68vh;object-fit:contain;margin-top:20px;background:#f4f4f1;border:1px solid var(--line);
}
.answer-source-modal{width:min(420px,100%)}
.answer-source-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:24px}
.answer-source-btn{
  height:46px;border:1px solid var(--ink);background:#fff;color:var(--ink);
  font-size:12px;letter-spacing:.08em;transition:.2s var(--ease);
}
.answer-source-btn:hover{background:var(--ink);color:#fff}
.scan-mode{
  display:inline-flex;align-items:center;gap:7px;margin-top:16px;
  font-size:9.5px;letter-spacing:.04em;color:var(--muted);cursor:pointer;
}
.scan-mode input{accent-color:var(--ink)}
.scan-notes{padding-top:8px}
.scan-note{display:grid;grid-template-columns:34px 1fr;gap:16px;padding:22px 0;border-bottom:1px solid var(--line)}
.scan-note b{font-family:var(--mono);font-size:10px;color:var(--red);font-weight:400;padding-top:3px}
.scan-note h4{margin:0;font-family:var(--serif);font-size:18px;font-weight:700}
.scan-note p{margin:8px 0 0;font-size:11.5px;line-height:1.9;color:var(--muted)}
.scan-privacy{margin-top:24px;font-size:9.5px;line-height:1.9;letter-spacing:.06em;color:var(--muted-2)}

.scan-busy{
  position:relative;min-height:430px;border:1px solid var(--line-2);background:#24221e;
  border-radius:0;display:grid;place-items:center;overflow:hidden;
}
.scan-busy img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;opacity:.34;filter:grayscale(1)}
.scan-busy .scanline{
  position:absolute;left:0;right:0;height:2px;background:var(--red-2);
  box-shadow:0 0 26px 5px rgba(217,86,67,.55);animation:scanline 1.8s ease-in-out infinite;
}
.busy-copy{position:relative;z-index:2;text-align:center;color:#fff}
.busy-copy b{display:block;font-family:var(--serif);font-size:30px;font-weight:400;letter-spacing:.06em}
.busy-copy span{display:block;margin-top:12px;font-size:10px;letter-spacing:.2em;color:rgba(255,255,255,.55)}
@keyframes scanline{0%,100%{top:12%}50%{top:88%}}

.scan-result-head{display:flex;align-items:center;justify-content:flex-end;gap:20px;margin-bottom:18px}
.scan-result-head .micro{color:var(--muted)}
.scan-board{
  position:relative;display:flex;justify-content:center;background:#fff;
  border:1px solid var(--line-2);border-radius:0;padding:14px;min-height:0;flex:1;overflow:hidden;
}
.scan-stage{position:relative;display:inline-block;max-width:100%;line-height:0}
.scan-stage img{max-height:100%;width:auto;max-width:100%;object-fit:contain;background:#fff}
.scan-layout:not(.has-result) .dropzone,
.scan-layout:not(.has-result) .scan-busy{height:100%;min-height:360px}
.scan-layout:not(.has-result){
  flex:0 1 auto;height:min(760px,calc(100vh - 280px));min-height:360px;
}
.scan-box{
  position:absolute;border:1.5px solid rgba(177,58,43,.88);
  border-radius:4px;background:rgba(177,58,43,.045);transition:.2s;
}
.scan-box:hover{background:rgba(177,58,43,.12)}
.scan-box.active{border-width:2px;background:rgba(177,58,43,.13);box-shadow:0 0 0 3px rgba(177,58,43,.1)}
.scan-box .box-no{
  position:absolute;left:-1px;top:-24px;height:23px;min-width:34px;padding:0 8px;
  display:flex;align-items:center;justify-content:center;background:var(--ink);color:#fff;
  font-family:var(--mono);font-size:9.5px;letter-spacing:.08em;
}
.scan-box.active .box-no{background:var(--red)}
.scan-box .box-state{
  position:absolute;right:4px;bottom:4px;padding:2px 6px;background:#fff;
  font-family:var(--sans);font-size:8px;letter-spacing:.05em;color:var(--muted);
}
.scan-box.active .box-state{color:var(--red)}

/* ---------------- 右侧解析面板 ---------------- */
.scan-detail{
  display:none;min-width:0;height:100%;min-height:0;
  flex-direction:column;overflow:hidden;background:#fff;
  border:0;box-shadow:none;position:relative;
}
.scan-layout.has-result .scan-detail{display:flex}
.scan-frame-nav{
  display:flex;gap:10px;overflow-x:auto;padding:14px 18px 12px;
  border-bottom:1px solid var(--line);flex:0 0 auto;
  scrollbar-width:none;
}
.scan-frame-nav::-webkit-scrollbar{display:none}
.scan-frame{
  width:126px;min-width:126px;padding:5px;border:1px solid var(--line-2);
  background:#fff;border-radius:4px;text-align:left;transition:border-color .2s,background .2s;
}
.scan-frame:hover{border-color:var(--ink)}
.scan-frame.active{border-color:var(--red);box-shadow:0 0 0 2px rgba(177,58,43,.12)}
.scan-frame-thumb{
  display:block;width:114px;height:70px;background-color:#fff;background-repeat:no-repeat;
  border:1px solid var(--line);border-radius:4px;overflow:hidden;
}
.scan-frame-meta{display:flex;align-items:center;justify-content:space-between;gap:6px;padding:7px 2px 2px}
.scan-frame-meta b{font-family:var(--mono);font-size:9px;font-weight:500;letter-spacing:.05em;color:var(--ink)}
.scan-frame-meta small{font-size:8px;color:var(--red)}
.scan-frame-meta small.matched{color:var(--ink)}
.scan-frame-meta small.ambiguous{color:var(--red)}
.scan-frame-meta small.not_found{color:var(--red)}
.sheet-top{
  display:flex;align-items:center;gap:12px;padding:12px 18px 14px;border-bottom:0;
  flex:0 0 auto;flex-wrap:wrap;
}
.scan-source{
  font-size:11px;font-weight:700;letter-spacing:.03em;color:var(--ink);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:38%;
}
.question-source{
  margin-bottom:12px;text-align:left;font-size:10.5px;font-weight:700;
  letter-spacing:.03em;color:var(--ink);
}
.sheet-top .micro{white-space:nowrap}
.q-select{
  width:96px;height:30px;border:1px solid var(--line-2);background:var(--paper-3);padding:0 30px 0 10px;
  border-radius:4px;font-size:10.5px;letter-spacing:.04em;appearance:none;
  background-image:linear-gradient(45deg,transparent 50%,var(--ink) 50%),linear-gradient(135deg,var(--ink) 50%,transparent 50%);
  background-position:calc(100% - 14px) 52%,calc(100% - 9px) 52%;
  background-size:5px 5px,5px 5px;background-repeat:no-repeat;cursor:pointer;
}
.status-pill{
  display:inline-flex;align-items:center;gap:7px;padding:4px 10px;font-size:9.5px;letter-spacing:.1em;
  border:1px solid var(--line-2);border-radius:4px;color:var(--muted);white-space:nowrap;
}
.status-pill::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--muted)}
.status-pill.ok{color:var(--green);border-color:rgba(66,98,77,.35)}
.status-pill.ok::before{background:var(--green)}
.status-pill.bad{color:var(--red);border-color:rgba(177,58,43,.35)}
.status-pill.bad::before{background:var(--red)}
.sheet-top .spacer{flex:1}
.add-wrong{
  width:96px;height:30px;min-height:30px;padding:0 8px;border:1px solid var(--line-2);border-radius:4px;
  font-size:10.5px;letter-spacing:.04em;display:inline-flex;align-items:center;gap:5px;
  justify-content:center;transition:.2s;background:#f1f1ef;color:var(--muted);
  white-space:nowrap;flex:0 0 auto;
}
.add-wrong svg{width:13px;height:13px}
.add-wrong:hover{background:#fff;color:var(--ink);border-color:var(--line-2)}
.add-wrong.added{background:var(--ink);border-color:var(--ink);color:#fff}
.add-wrong.removed,
.add-wrong.removed:hover{background:#fff;border-color:var(--line-2);color:var(--ink)}
.sheet-body{flex:1;min-height:0;overflow-y:auto;padding:20px 18px 30px;overscroll-behavior:contain}
.scan-detail .sheet-grid{grid-template-columns:minmax(0,1.08fr) minmax(280px,.92fr);gap:30px}
.scan-detail .sheet-col + .sheet-col{border-left:1px solid var(--line);padding-left:30px}
.sheet-col .micro{margin-bottom:14px}
.sheet-col .answer-block{border-top:0;margin-top:0;padding-top:0}
.not-found{padding:40px 0 10px;text-align:center}
.not-found b{display:block;font-family:var(--serif);font-size:46px;font-weight:700;letter-spacing:-.03em;color:var(--red)}
.not-found p{margin:14px auto 0;max-width:460px;font-size:11.5px;line-height:1.9;color:var(--muted)}
.scan-help-actions{
  display:flex;align-items:center;justify-content:center;gap:10px;
  flex-wrap:wrap;margin-top:22px;padding-top:18px;border-top:1px solid var(--line);
}
.scan-answer-btn{
  height:40px;padding:0 16px;border:1px solid var(--line-2);border-radius:0;
  background:#fff;color:var(--ink);font-size:11px;transition:.2s;
}
.scan-answer-btn:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.scan-ask-btn:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.scan-ask-btn.asked{background:var(--ink);border-color:var(--ink);color:#fff}
.scan-help-draft{
  width:100%;text-align:center;font-size:9px;color:var(--muted);letter-spacing:.04em;
}
.scan-help-status{
  display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;
  margin-top:20px;padding:12px;border:1px solid var(--line);background:#fafafa;text-align:left;
}
.scan-help-status b{font-size:10px}
.scan-help-status span{font-size:9.5px;color:var(--muted)}
.ocr-raw{
  margin-top:28px;padding:16px 18px;background:rgba(23,22,19,.035);border-left:2px solid var(--line-2);
  font-family:var(--serif);font-size:12px;line-height:1.9;color:var(--muted);text-align:left;
  max-height:180px;overflow:auto;white-space:pre-wrap;
}
.candidate-list{display:flex;flex-direction:column;gap:8px;margin-top:22px;text-align:left}
.candidate{
  width:100%;display:flex;flex-direction:column;align-items:stretch;gap:7px;
  padding:9px 10px;border:1px solid var(--line-2);border-radius:4px;
  background:#fff;text-align:left;transition:border-color .2s,background .2s;
}
.candidate:hover{border-color:var(--ink);background:#fdfdfc}
.candidate-head{display:flex;align-items:center;justify-content:space-between;gap:12px;text-align:left}
.candidate .c-src{
  min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  font-size:10px;font-weight:700;color:var(--ink);letter-spacing:.025em;
}
.candidate .c-score{font-family:var(--mono);font-size:9px;color:var(--muted);flex:0 0 auto}
.candidate-scroll{
  max-height:calc(6 * 1.75em);overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;
  scrollbar-width:none;-ms-overflow-style:none;padding-right:2px;
}
.candidate-scroll::-webkit-scrollbar{width:0;height:0;display:none}
.candidate .c-text{font-family:var(--serif);font-size:12px;line-height:1.75;color:var(--ink-2)}
.c-options{
  list-style:none;margin:7px 0 0;padding:0;display:flex;flex-direction:column;gap:3px;
  font-family:var(--serif);font-size:11.5px;line-height:1.65;color:var(--muted);
}
.c-options li{display:flex;gap:6px}
.c-options b{flex:0 0 auto;font-family:var(--mono);font-size:9px;font-weight:500;color:var(--ink)}
.alt-cands{margin-top:26px;border-top:1px dashed var(--line-2);padding-top:14px}
.alt-cands summary{
  cursor:pointer;font-size:10px;letter-spacing:.08em;color:var(--muted);
  list-style:none;
}
.alt-cands summary::-webkit-details-marker{display:none}
.alt-cands summary::before{content:"＋ ";color:var(--red)}
.alt-cands[open] summary::before{content:"－ "}

/* ---------------- 错题本 ---------------- */
.wb-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-bottom:26px;border:1px solid var(--line-2)}
.wb-summary div{padding:20px 22px;border-right:1px solid var(--line)}
.wb-summary div:last-child{border-right:0}
.wb-summary b{display:block;font-family:var(--serif);font-size:34px;font-weight:700;line-height:1}
.wb-summary span{display:block;margin-top:8px;font-size:9px;letter-spacing:.2em;color:var(--muted)}
.wb-toolbar{
  display:flex;align-items:center;gap:20px;flex-wrap:wrap;padding:14px 0 16px;
  border-bottom:1px solid var(--ink);position:sticky;top:0;z-index:12;
  background:rgba(255,255,255,.94);backdrop-filter:blur(10px);
}
.segmented{display:inline-flex;border:1px solid var(--line-2)}
.segmented button{padding:8px 14px;font-size:10.5px;letter-spacing:.06em;color:var(--muted)}
.segmented button + button{border-left:1px solid var(--line)}
.segmented button.on{background:var(--ink);color:#fff}
.toolbar-spacer{flex:1}
.sort-group{display:flex;align-items:center;gap:8px}
.sort-group .micro{font-size:9px}
.sort-btn{
  display:inline-flex;align-items:center;gap:6px;padding:7px 10px;font-size:10.5px;color:var(--muted);
  border-bottom:1px solid transparent;
}
.sort-btn.on{color:var(--ink);border-color:var(--ink);font-weight:700}
.sort-btn .arrow{font-size:8px}
.start-btn{height:40px;min-height:40px}
.mobile-start-review{display:none}
.start-btn .count{
  display:inline-grid;place-items:center;min-width:19px;height:19px;padding:0 5px;
  background:#fff;color:var(--ink);border:1px solid var(--ink);
  font-family:var(--mono);font-size:9px;
}
.wb-select-row{display:flex;align-items:center;gap:14px;padding:18px 0 10px}
.check-btn{display:inline-flex;align-items:center;gap:9px;font-size:10.5px;color:var(--muted);letter-spacing:.08em}
.check-btn .box{width:16px;height:16px;border:1px solid var(--line-2);display:grid;place-items:center;font-size:10px;color:transparent}
.check-btn.on{color:var(--ink)}
.check-btn.on .box{background:var(--ink);border-color:var(--ink);color:#fff}
.wb-count{margin-left:auto;font-family:var(--mono);font-size:9px;color:var(--muted)}
.wb-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding-top:10px}
.wb-card{
  position:relative;display:flex;flex-direction:column;min-height:300px;padding:26px 26px 20px;
  background:#ffffff;border:1px solid var(--line);transition:.3s var(--ease);
}
.wb-card:hover{border-color:var(--line-3);background:#fafafa;box-shadow:var(--shadow);transform:translateY(-2px)}
.wb-card.in-cart{border-color:var(--ink);box-shadow:4px 4px 0 rgba(23,22,19,.08)}
.wb-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.cart-toggle{
  display:inline-flex;align-items:center;gap:7px;padding:5px 9px;border:1px solid var(--line-2);
  font-size:9px;letter-spacing:.06em;color:var(--muted);transition:.2s;
}
.cart-toggle:hover{border-color:var(--ink);color:var(--ink)}
.cart-toggle.on{background:var(--ink);border-color:var(--ink);color:#fff}
.cart-toggle svg{width:13px;height:13px}
.trash-btn{width:30px;height:30px;display:grid;place-items:center;color:var(--muted-2);border:1px solid transparent;transition:.2s}
.trash-btn:hover{color:var(--red);border-color:rgba(177,58,43,.3)}
.trash-btn svg{width:14px;height:14px}
.wb-card .q-meta{margin-top:20px}
.wb-card .qbody{margin-top:14px;flex:1}
.wb-card .qtext{font-size:15.5px;line-height:1.95;max-height:7.8em;overflow:hidden;position:relative}
.wb-card .qtext::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2.4em;
  background:linear-gradient(transparent,var(--paper-3));
}
.wb-card:hover .qtext::after{background:linear-gradient(transparent,rgba(255,253,248,.9))}
.wb-card .qfigs{display:none}
.wb-card .qopts{display:none}
.help-book-note{
  padding:14px 16px;margin-bottom:22px;border:1px solid var(--line);
  font-size:10px;line-height:1.8;color:var(--muted);
}
.help-card .status-pill{font-size:9px}
.help-question-img{
  width:100%;max-height:280px;object-fit:contain;margin-top:16px;
  border:1px solid var(--line);background:#fff;
}
.help-question-text{
  margin-top:16px;font-family:var(--serif);font-size:14px;line-height:1.9;color:var(--ink-2);
  white-space:pre-wrap;
}
.help-question-text>span{
  display:block;margin-bottom:6px;font-family:var(--sans);font-size:8.5px;
  letter-spacing:.13em;color:var(--muted-2);
}
.help-question-text p{margin:0}
.help-answer-text{
  margin-top:16px;padding-top:14px;border-top:1px solid var(--line);
  font-size:11px;line-height:1.8;
}
.help-answer-text b{display:block;margin-bottom:6px;font-size:9px;letter-spacing:.12em;color:var(--green)}
.help-answer-text p{margin:0;font-family:var(--serif);font-size:14px;line-height:1.9}
.help-answer-images{display:grid;grid-template-columns:1fr;gap:10px;margin-top:14px}
.help-answer-img{width:100%;max-height:260px;object-fit:contain;border:1px solid var(--line)}
.help-card .wb-foot .primary-btn{
  height:34px;min-height:34px;padding:0 15px;font-size:11px;
  background:#fff;color:var(--ink);border:1px solid var(--ink);
  transform:none;
}
.help-card .wb-foot .primary-btn:hover{
  background:var(--ink);color:#fff;border-color:var(--ink);transform:none;
}
.wb-foot{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:20px;padding-top:14px;
  border-top:1px solid var(--line);font-family:var(--mono);font-size:8.5px;color:var(--muted);
  letter-spacing:.03em;
}
.wb-foot .due{margin-left:auto;color:var(--red);font-family:var(--sans);font-size:9px;letter-spacing:.06em}
.wb-foot .due.future{color:var(--muted)}
.wb-foot .attempt{color:var(--ink-2)}
.empty-state{
  padding:100px 20px;text-align:center;border-top:1px solid var(--line);
}
.empty-state b{display:block;font-family:var(--serif);font-size:48px;font-weight:700;letter-spacing:-.04em}
.empty-state p{margin:16px 0 0;font-size:11.5px;line-height:1.9;color:var(--muted)}
.empty-state .primary-btn{margin-top:28px}
.load-more{display:flex;justify-content:center;padding:34px 0 10px}

/* ---------------- 弹窗 / toast ---------------- */
#toast{
  position:fixed;left:50%;bottom:42px;z-index:120;transform:translate(-50%,20px);
  background:var(--ink);color:#fff;padding:12px 20px;font-size:11.5px;letter-spacing:.04em;
  opacity:0;pointer-events:none;transition:.28s var(--ease);max-width:min(520px,calc(100vw - 40px));
  text-align:center;line-height:1.6;
}
#toast.show{opacity:1;transform:translate(-50%,0)}
.modal-mask{
  position:fixed;inset:0;z-index:100;background:rgba(23,22,19,.46);backdrop-filter:blur(3px);
  display:grid;place-items:center;padding:20px;animation:fadein .2s;
}
.modal{
  width:min(620px,100%);max-height:86vh;overflow:auto;background:var(--paper-3);
  border:1px solid var(--ink);padding:34px 36px;box-shadow:var(--shadow);
}
.modal h3{margin:0;font-family:var(--serif);font-size:30px;font-weight:700;letter-spacing:-.03em}
.modal p{margin:14px 0 0;font-size:12px;line-height:1.9;color:var(--muted)}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:28px}
.modal .qbody{margin-top:20px}
.modal-close{float:right;font-size:20px;color:var(--muted)}
@keyframes fadein{from{opacity:0}to{opacity:1}}

/* ---------------- 做题界面 ---------------- */
.exam{position:fixed;inset:0;z-index:80;background:#efefef;display:flex;flex-direction:column}
.exam-bar{
  height:58px;flex:0 0 auto;display:flex;align-items:center;gap:22px;padding:0 26px;
  background:var(--paper-3);border-bottom:1px solid var(--ink);
}
.exam-back{display:inline-flex;align-items:center;gap:9px;font-size:10.5px;letter-spacing:.1em;color:var(--muted)}
.exam-back:hover{color:var(--ink)}
.exam-title{font-family:var(--serif);font-size:17px;font-weight:700;letter-spacing:.04em}
.exam-sub{font-family:var(--mono);font-size:8.5px;color:var(--muted);letter-spacing:.09em}
.mobile-exam-hint{display:none}
.orientation-toggle{
  display:inline-flex;align-items:center;gap:7px;padding:7px 10px;
  border:1px solid var(--line-2);background:#fff;color:var(--muted);
  font-size:9px;letter-spacing:.08em;white-space:nowrap;transition:.2s;
}
.orientation-toggle:hover{border-color:var(--ink);color:var(--ink)}
.orientation-icon{
  width:11px;height:16px;border:1px solid currentColor;display:block;position:relative;
}
.orientation-icon::after{
  content:"";position:absolute;left:50%;bottom:2px;width:2px;height:2px;
  background:currentColor;transform:translateX(-50%);
}
.exam-progress{margin-left:auto;display:flex;align-items:center;gap:14px}
.exam-progress .bar{width:140px;height:2px;background:var(--line)}
.exam-progress .bar i{display:block;height:100%;background:var(--red);transition:width .3s}
.exam-progress b{font-family:var(--mono);font-size:9px;color:var(--muted);font-weight:400}
.exam-scroll{
  flex:1;position:relative;overflow:auto;overscroll-behavior:contain;
  padding:34px 0 120px;touch-action:none;cursor:crosshair;
}
.exam-scroll.grading{touch-action:pan-y;cursor:auto}
.exam-scroll img{user-select:none;-webkit-user-drag:none}
.exam-scroll:not(.grading) .paper-stage{
  user-select:none;-webkit-user-select:none;
}
.paper-wrap{margin:0 auto;position:relative;will-change:width,height}
.paper-stage{
  width:1000px;position:relative;transform-origin:top left;
  background:var(--paper-3);box-shadow:0 24px 70px rgba(23,22,19,.18);
  padding:0 0 40px;will-change:transform;
}
.paper-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:20px;
  padding:54px 72px 30px;border-bottom:1px solid var(--ink);
}
.paper-head .ph-left .micro{margin-bottom:9px}
.paper-head h2{margin:0;font-family:var(--serif);font-size:38px;font-weight:700;letter-spacing:-.04em}
.paper-head .ph-right{text-align:right;font-family:var(--mono);font-size:8.5px;line-height:1.9;color:var(--muted)}
.exam-q{
  position:relative;padding:58px 72px 54px;border-bottom:1px solid var(--line);
}
.exam-q:last-of-type{border-bottom:0}
.exam-q .q-meta{padding-right:120px}
.exam-q .qbody{margin-top:22px}
.exam-q .qtext{font-size:18px;line-height:2.08}
.exam-q .qopts li{font-size:17px;line-height:2.02}
.cant-btn{
  position:absolute;left:18px;top:18px;z-index:6;display:inline-flex;align-items:center;gap:7px;
  padding:6px 10px;border:1px solid rgba(177,58,43,.42);background:rgba(255,253,248,.92);
  font-family:var(--sans);font-size:9.5px;color:var(--red);letter-spacing:.08em;transition:.2s;
}
.cant-btn::before{content:"";width:6px;height:6px;border:1px solid currentColor;border-radius:50%}
.cant-btn:hover{background:var(--red);color:#fff}
.cant-btn.on{background:var(--red);border-color:var(--red);color:#fff}
.cant-btn.on::before{background:#fff;border-color:#fff}
.exam-mark{position:absolute;left:18px;top:18px;z-index:7;display:flex;gap:5px}
.mark-btn{
  padding:6px 9px;border:1px solid var(--line-2);background:rgba(255,255,255,.94);
  font-family:var(--sans);font-size:9px;letter-spacing:.06em;color:var(--muted);
  transition:.2s;
}
.mark-btn:hover{border-color:var(--ink);color:var(--ink)}
.mark-btn[data-mark="yes"].on{background:var(--green);border-color:var(--green);color:#fff}
.mark-btn[data-mark="no"].on{background:var(--red);border-color:var(--red);color:#fff}
.grading-banner{
  margin:0 72px;padding:18px 0;border-bottom:1px solid var(--line);
  font-family:var(--serif);font-size:16px;font-weight:700;color:var(--red);
  position:relative;z-index:6;background:#fff;
}
.grade-box{
  position:relative;z-index:6;margin-top:30px;padding:24px 0 4px;
  border-top:1px solid var(--ink);background:#fff;
}
.grade-box .answer-block{border-top:0;margin-top:0;padding-top:0}
.grade-premark{
  margin-bottom:14px;font-family:var(--sans);font-size:9px;letter-spacing:.08em;
  color:var(--muted);
}
.grade-actions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
.grade-btn{
  min-height:38px;padding:0 16px;border:1px solid var(--line-2);background:#fff;
  font-family:var(--sans);font-size:10px;letter-spacing:.08em;color:var(--muted);
  transition:.2s;
}
.grade-btn:hover{border-color:var(--ink);color:var(--ink)}
.grade-btn.no.on{background:var(--red);border-color:var(--red);color:#fff}
.grade-btn.full.on{background:var(--green);border-color:var(--green);color:#fff}
.ink-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:4;pointer-events:none}
.paper-end{
  padding:80px 72px 60px;text-align:center;border-top:1px solid var(--ink);
}
.paper-end b{display:block;font-family:var(--serif);font-size:42px;font-weight:700;letter-spacing:-.04em}
.paper-end p{margin:14px 0 0;font-size:11px;letter-spacing:.08em;color:var(--muted)}
.paper-end .end-mark{
  width:58px;height:58px;margin:0 auto 20px;border:1px solid var(--red);color:var(--red);
  display:grid;place-items:center;font-family:var(--serif);font-size:17px;transform:rotate(-4deg);
}
.ink-tools{
  position:fixed;left:24px;bottom:24px;z-index:90;display:flex;align-items:center;gap:14px;
  padding:11px 14px;background:rgba(255,253,248,.96);border:1px solid var(--ink);
  box-shadow:0 10px 30px rgba(23,22,19,.12);
}
.ink-colors{display:flex;gap:7px;align-items:center}
.ink-color{width:19px;height:19px;border:1px solid var(--line-2);border-radius:50%;position:relative}
.ink-color.on{box-shadow:0 0 0 2px var(--paper-3),0 0 0 3px var(--ink)}
.ink-size{display:flex;align-items:center;gap:8px}
.ink-size input{width:86px;accent-color:var(--ink)}
.ink-size span{font-family:var(--mono);font-size:8px;color:var(--muted);width:22px}
.ink-tools .divider{width:1px;height:22px;background:var(--line)}
.tool-btn{width:30px;height:30px;display:grid;place-items:center;border:1px solid transparent;font-size:13px;color:var(--muted)}
.tool-btn:hover{border-color:var(--line-2);color:var(--ink)}
.tool-btn svg{width:15px;height:15px}
.ink-hint{
  position:fixed;left:50%;bottom:26px;transform:translateX(-50%);z-index:88;
  font-size:9px;letter-spacing:.12em;color:rgba(23,22,19,.45);pointer-events:none;
}
.finish-btn{
  position:fixed;right:26px;bottom:24px;z-index:92;min-width:148px;height:50px;
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  background:var(--ink);color:#fff;border:1px solid var(--ink);font-size:12px;letter-spacing:.12em;
  opacity:0;transform:translateY(14px);pointer-events:none;transition:.3s var(--ease);
}
.finish-btn.show{opacity:1;transform:none;pointer-events:auto}
.finish-btn:hover{background:var(--red);border-color:var(--red)}
.rotate-hint{display:none}

/* ---------------- 结果 ---------------- */
.result-page{max-width:1000px;margin:0 auto;padding:70px 46px 120px}
.result-hero{display:grid;grid-template-columns:1fr auto;gap:30px;align-items:end;border-bottom:1px solid var(--ink);padding-bottom:28px}
.result-hero h1{margin:0;font-family:var(--serif);font-size:clamp(44px,6vw,78px);font-weight:700;letter-spacing:-.05em;line-height:.95}
.result-hero .stamp{
  width:92px;height:92px;border:2px solid var(--red);color:var(--red);display:grid;place-items:center;
  font-family:var(--serif);font-size:21px;line-height:1.25;text-align:center;transform:rotate(-5deg);
}
.result-stats{display:grid;grid-template-columns:repeat(3,1fr);margin-top:30px;border:1px solid var(--line-2)}
.result-stats div{padding:22px;border-right:1px solid var(--line)}
.result-stats div:last-child{border-right:0}
.result-stats b{display:block;font-family:var(--serif);font-size:38px;font-weight:700;line-height:1}
.result-stats span{display:block;margin-top:8px;font-size:9px;letter-spacing:.2em;color:var(--muted)}
.result-list{margin-top:40px;border-top:1px solid var(--ink)}
.result-row{
  display:grid;grid-template-columns:minmax(0,1fr) auto;gap:22px;align-items:center;
  padding:20px 4px;border-bottom:1px solid var(--line);
}
.result-row .r-title{font-family:var(--serif);font-size:16px;line-height:1.6}
.result-row .r-meta{margin-top:6px;font-family:var(--mono);font-size:8.5px;color:var(--muted);letter-spacing:.04em}
.result-row .r-state{display:flex;align-items:center;gap:14px;text-align:right}
.state-pill{display:inline-flex;padding:4px 9px;font-size:9px;letter-spacing:.08em;border:1px solid var(--line-2)}
.state-pill.ok{color:var(--green);border-color:rgba(66,98,77,.4)}
.state-pill.no{color:var(--red);border-color:rgba(177,58,43,.4)}
.result-row .r-next{font-family:var(--mono);font-size:8.5px;color:var(--muted)}
.result-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:38px}

/* ---------------- 组卷 ---------------- */
.compose-page{padding-bottom:130px}
.compose-head{grid-template-columns:1fr auto;align-items:end}
.compose-basket-shortcut{
  display:inline-flex;align-items:center;gap:9px;font-size:11px;color:var(--muted);
  border-bottom:1px solid var(--line-2);padding:7px 0;
}
.compose-basket-shortcut b{font-family:var(--mono);font-size:15px;color:var(--red);font-weight:500}
.compose-source-row{
  display:flex;align-items:center;gap:18px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.compose-source-row button,.compose-source-row a{
  padding:14px 2px;font-size:10.5px;letter-spacing:.08em;color:var(--muted);border-bottom:1px solid transparent;
}
.compose-source-row button.on{color:var(--ink);border-color:var(--ink)}
.compose-source-row a:hover{color:var(--ink)}
.compose-search{display:grid;grid-template-columns:1fr auto;gap:8px;margin-top:22px}
.compose-search input{
  height:44px;border:1px solid var(--line-2);background:#fff;padding:0 14px;font-size:12px;
}
.compose-search button{min-width:72px;border:1px solid var(--ink);background:var(--ink);color:#fff;font-size:10px;letter-spacing:.08em}
.compose-filter-row{
  display:flex;gap:8px;overflow-x:auto;padding:14px 0;scrollbar-width:none;
}
.compose-filter-row::-webkit-scrollbar{display:none}
.compose-filter-row button{
  flex:0 0 auto;padding:8px 11px;border:1px solid var(--line-2);background:#fff;
  font-size:9.5px;color:var(--muted);letter-spacing:.05em;
}
.compose-filter-row button.on{background:var(--ink);border-color:var(--ink);color:#fff}
.compose-filter-row button b{font-family:var(--mono);font-weight:400;color:var(--red)}
.compose-active-filters{display:flex;gap:7px;flex-wrap:wrap;padding:2px 0 16px}
.compose-active-filter{
  display:inline-flex;align-items:center;gap:7px;padding:6px 9px;border:1px solid var(--line-2);
  font-size:9px;color:var(--ink-2);background:#fff;
}
.compose-active-filter i{font-style:normal;color:var(--red)}
.compose-active-filters>button:last-child{font-size:9px;color:var(--muted);padding:6px 3px}
.compose-result-head{
  display:flex;justify-content:space-between;gap:20px;padding:13px 0;border-top:1px solid var(--ink);
  font-size:10px;color:var(--muted);
}
.compose-result-head b{font-family:var(--mono);color:var(--red);font-weight:500}
.compose-question-list{border-top:1px solid var(--line)}
.compose-q-card{
  padding:22px 2px 20px;border-bottom:1px solid var(--line);transition:.2s;
}
.compose-q-card.selected{background:rgba(23,22,19,.025)}
.compose-q-meta{display:flex;justify-content:space-between;gap:16px;font-family:var(--mono);font-size:8.5px;color:var(--muted)}
.compose-q-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.compose-q-text{
  margin-top:13px;font-family:var(--serif);font-size:15px;line-height:1.85;color:var(--ink-2);
}
.compose-q-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}
.compose-preview-btn,.compose-pick{
  min-height:36px;padding:0 13px;border:1px solid var(--line-2);font-size:9.5px;
  letter-spacing:.06em;color:var(--muted);background:#fff;
}
.compose-pick{border-color:var(--ink);color:var(--ink)}
.compose-pick.on{background:var(--ink);color:#fff}
.compose-bottom-bar{
  position:fixed;left:50%;bottom:max(14px,env(safe-area-inset-bottom));z-index:45;
  width:min(720px,calc(100vw - 32px));transform:translateX(-50%);
  min-height:52px;padding:0 18px;display:flex;align-items:center;justify-content:space-between;
  background:var(--ink);color:#fff;border:1px solid var(--ink);box-shadow:0 12px 35px rgba(23,22,19,.2);
  font-size:11px;letter-spacing:.04em;
}
.compose-bottom-bar b{font-family:var(--mono);font-size:16px;color:#fff}
.compose-bottom-bar strong{font-size:10px;font-weight:500;letter-spacing:.08em}
.compose-filter-modal{width:min(720px,100%);height:min(82dvh,760px);display:flex;flex-direction:column}
.compose-filter-body{flex:1;overflow:auto;margin-top:18px;border-top:1px solid var(--line)}
.compose-filter-node label,.compose-filter-node summary{
  min-height:42px;display:flex;align-items:center;gap:10px;padding:8px 4px 8px calc(var(--depth) * 15px + 4px);
  border-bottom:1px solid var(--line);font-size:11.5px;color:var(--ink-2);
}
.compose-filter-node summary{list-style:none;cursor:pointer}
.compose-filter-node summary::-webkit-details-marker{display:none}
.compose-filter-node summary::after{content:"＋";color:var(--red);font-size:12px;margin-left:4px}
.compose-filter-node details[open]>summary::after{content:"−"}
.compose-filter-check{flex:1;border-bottom:0!important;padding:0!important;min-height:auto!important}
.compose-filter-node input{accent-color:var(--ink);width:15px;height:15px}
.compose-filter-node label span{flex:1}
.compose-filter-node small{font-family:var(--mono);font-size:8px;color:var(--muted)}
.compose-filter-children{border-left:1px solid var(--line);margin-left:11px}
.compose-filter-actions{flex:0 0 auto}
.compose-basket-page{padding-bottom:120px}
.compose-basket-list{border-top:1px solid var(--ink)}
.compose-basket-item{
  display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:14px;align-items:start;
  padding:20px 2px;border-bottom:1px solid var(--line);
}
.compose-basket-index{font-family:var(--mono);font-size:9px;color:var(--muted);padding-top:4px}
.compose-basket-main .q-meta{justify-content:flex-start}
.compose-basket-text{margin-top:10px;font-family:var(--serif);font-size:13px;line-height:1.7;color:var(--muted)}
.compose-basket-actions{display:flex;gap:5px;flex-wrap:wrap;justify-content:flex-end}
.compose-basket-actions button{
  min-width:30px;height:30px;padding:0 8px;border:1px solid var(--line-2);font-size:9px;color:var(--muted);
}
.compose-basket-actions button:disabled{opacity:.25}
.compose-start-paper{
  position:fixed;left:50%;bottom:max(14px,env(safe-area-inset-bottom));transform:translateX(-50%);
  z-index:45;width:min(720px,calc(100vw - 32px));height:52px;background:var(--ink);color:#fff;
  border:1px solid var(--ink);font-size:11px;letter-spacing:.1em;
}
.compose-done-page{max-width:900px;margin:0 auto;padding:80px 46px 120px}
.compose-done-page h1{font-family:var(--serif);font-size:clamp(46px,7vw,82px);line-height:.98;letter-spacing:-.05em;margin:14px 0 34px}
.compose-done-note{font-size:11px;line-height:1.9;color:var(--muted);margin-top:24px}
.wb-card-actions{display:flex;align-items:center;gap:4px}
.compose-toggle{
  display:inline-flex;align-items:center;gap:6px;padding:5px 8px;border:1px solid var(--line-2);
  font-size:8.5px;color:var(--muted);
}
.compose-toggle svg{width:13px;height:13px}
.compose-toggle.on{border-color:var(--ink);color:var(--ink);background:rgba(23,22,19,.04)}
.compose-verdict{display:flex;gap:7px;flex-wrap:wrap;margin-top:22px}
.compose-review-controls{
  margin:0 0 22px;padding:0 0 18px;border-bottom:1px solid var(--line-2);
}
.compose-review-controls .compose-verdict{margin-top:0}
.compose-verdict button{
  min-height:38px;padding:0 13px;border:1px solid var(--line-2);background:#fff;
  font-size:9.5px;color:var(--muted);letter-spacing:.04em;
}
.compose-verdict button.on{background:var(--ink);border-color:var(--ink);color:#fff}
.compose-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px;padding-top:12px;border-top:1px dashed var(--line-2)}
.compose-actions[hidden],.compose-actions button[hidden]{display:none}
.compose-actions button{
  min-height:36px;padding:0 13px;border:1px solid var(--line-2);background:#fff;
  font-size:9px;color:var(--muted);
}
.compose-actions button.on{border-color:var(--red);color:var(--red);background:rgba(177,58,43,.05)}
.compose-actions button:disabled{opacity:.35}

/* ---------------- 账号 / 个人主页 ---------------- */
.user-chip{
  display:inline-flex;align-items:center;gap:9px;font-size:10.5px;color:var(--muted);
  letter-spacing:.04em;transition:.2s;
}
.user-chip:hover{color:var(--ink)}
.user-name{max-width:96px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-avatar{
  width:30px;height:30px;border-radius:50%;display:grid;place-items:center;
  background:var(--ink);color:#fff;font-size:11px;font-weight:700;line-height:1;
}
.user-avatar.guest{
  background:#fff;color:var(--ink);border:1px solid var(--ink);border-radius:0;
  font-weight:500;
}
.avatar-red{background:#b13a2b}
.avatar-green{background:#42624d}
.avatar-blue{background:#315a83}
.avatar-amber{background:#a06a1f}
.avatar-violet{background:#6b4b7a}
.avatar-ink{background:#171613}

.feynman-quote{
  margin:34px 0 0;padding:0 0 0 22px;border-left:2px solid var(--ink);max-width:610px;
}
.feynman-quote p{
  margin:0;font-size:16px;line-height:2;color:var(--ink-2);font-weight:500;
  letter-spacing:.005em;
}
.feynman-quote cite{
  display:block;margin-top:12px;font-style:normal;font-size:10px;letter-spacing:.14em;
  color:var(--muted);
}

.login-wrap{
  max-width:1240px;min-height:calc(100vh - 92px);margin:0 auto;padding:52px 46px 80px;
  display:grid;grid-template-columns:1.02fr .98fr;gap:88px;align-items:center;
  --login-pad:46px;--login-title:clamp(52px,6.4vw,100px);
}
.login-left{position:relative;padding-top:0}
.login-left::before{
  content:"";position:absolute;left:calc(-1 * (var(--login-pad) + max(0px, (100vw - 1240px) / 2)));
  top:0;width:calc(var(--login-pad) + max(0px, (100vw - 1240px) / 2) + 2 * var(--login-title));
  height:1px;background:var(--ink);
}
.login-left h1{
  margin:30px 0 0;font-size:var(--login-title);line-height:.94;letter-spacing:-.065em;
  font-weight:700;
}
.login-left h1 .red{color:var(--red)}
.login-left .feynman-quote{
  margin:26px 0 0;padding:0;border-left:0;max-width:490px;
}
.login-left .feynman-quote p{font-size:13px;line-height:2;color:var(--muted);font-weight:400}
.login-left .feynman-quote cite{font-size:9.5px;color:var(--muted-2)}
.login-card{
  width:100%;max-width:430px;justify-self:end;border-top:1px solid var(--ink);padding-top:28px;
}
.auth-head .micro{margin-bottom:9px}
.auth-head h2{margin:0;font-size:30px;font-weight:700;letter-spacing:-.035em}
.auth-head p{margin:10px 0 0;font-size:11px;line-height:1.8;color:var(--muted)}
.auth-form{margin-top:28px}
.field{margin:0 0 20px}
.field label{display:block;font-size:9px;letter-spacing:.2em;color:var(--muted);margin-bottom:7px}
.field input,.field select{
  width:100%;border:0;border-bottom:1px solid var(--line-2);background:transparent;
  padding:10px 0;font-size:15px;outline:0;border-radius:0;
}
.field input:focus,.field select:focus{border-color:var(--ink)}
.field select{cursor:pointer}
.auth-submit{
  width:100%;min-height:48px;background:var(--ink);color:#fff;border:1px solid var(--ink);
  font-size:11.5px;letter-spacing:.12em;transition:.2s;
}
.auth-submit:hover{background:var(--red);border-color:var(--red)}
.auth-switch{
  margin-top:18px;font-size:10.5px;color:var(--muted);text-align:center;
}
.auth-switch button{color:var(--ink);border-bottom:1px solid var(--line-2);padding-bottom:2px}
.auth-switch button:hover{border-color:var(--ink)}
.auth-error{
  margin:0 0 16px;padding:9px 11px;border-left:2px solid var(--red);
  background:#fff5f3;color:var(--red);font-size:10.5px;line-height:1.7;
}

.profile-page{max-width:1240px;margin:0 auto;padding:46px 46px 100px}
.profile-hero{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:28px;align-items:center;
  padding:30px 0 28px;border-bottom:1px solid var(--ink);
}
.profile-avatar{
  width:92px;height:92px;border-radius:50%;display:grid;place-items:center;
  color:#fff;font-size:32px;font-weight:700;line-height:1;
}
.profile-hero h1{margin:0;font-size:clamp(38px,4.6vw,64px);line-height:1;letter-spacing:-.055em;font-weight:700}
.profile-meta{margin-top:10px;font-size:10px;letter-spacing:.1em;color:var(--muted)}
.profile-bio{margin:12px 0 0;font-size:12px;line-height:1.8;color:var(--ink-2)}
.profile-actions{display:flex;flex-direction:column;gap:8px;align-items:stretch}
.profile-stats{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line-2);margin-top:26px}
.profile-stat{padding:18px 20px;border-right:1px solid var(--line)}
.profile-stat:last-child{border-right:0}
.profile-stat b{display:block;font-size:32px;line-height:1;font-weight:700}
.profile-stat span{display:block;margin-top:8px;font-size:8.5px;letter-spacing:.18em;color:var(--muted)}
.profile-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:20px;margin-top:26px}
.profile-card{border:1px solid var(--line);padding:24px 26px;background:#fff}
.profile-card h3{margin:0;font-size:13px;letter-spacing:.06em;font-weight:700}
.profile-card .card-sub{margin:7px 0 0;font-size:9.5px;color:var(--muted);letter-spacing:.04em}
.activity-bars{display:flex;align-items:flex-end;gap:12px;height:132px;margin-top:28px}
.activity-day{flex:1;display:flex;flex-direction:column;align-items:center;gap:7px;height:100%;justify-content:flex-end}
.activity-day i{display:block;width:100%;min-height:3px;background:var(--ink);transition:.3s}
.activity-day.today i{background:var(--red)}
.activity-day b{font-family:var(--mono);font-size:8px;color:var(--muted);font-weight:400}
.activity-day span{font-size:8px;color:var(--muted-2)}
.profile-facts{display:grid;grid-template-columns:1fr 1fr;gap:0;margin-top:22px;border-top:1px solid var(--line)}
.profile-fact{padding:14px 0;border-bottom:1px solid var(--line)}
.profile-fact:nth-child(odd){border-right:1px solid var(--line);padding-right:16px}
.profile-fact:nth-child(even){padding-left:16px}
.profile-fact b{display:block;font-size:21px;font-weight:700;line-height:1}
.profile-fact span{display:block;margin-top:6px;font-size:8.5px;color:var(--muted);letter-spacing:.08em}
.recent-item{
  display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;
  padding:13px 0;border-bottom:1px solid var(--line);
}
.recent-item:last-child{border-bottom:0}
.recent-item .r-title{font-size:11px;line-height:1.6;color:var(--ink-2)}
.recent-item .r-sub{margin-top:4px;font-family:var(--mono);font-size:8px;color:var(--muted)}
.recent-item .r-state{font-size:9px;letter-spacing:.06em}
.recent-item .r-state.ok{color:var(--green)}
.recent-item .r-state.no{color:var(--red)}
.profile-empty{padding:34px 0;text-align:center;font-size:10.5px;line-height:1.9;color:var(--muted)}
.profile-edit-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:28px}

/* ---------------- 响应式 ---------------- */
@media (max-width:1120px){
  body.scan-page-mode{overflow:auto}
  .scan-page{height:auto;min-height:100vh;overflow:visible;padding-bottom:80px}
  .scan-utility-bar{grid-template-columns:1fr;row-gap:8px}
  .scan-mini-identity{grid-column:1}
  .home{grid-template-columns:1fr;gap:48px;padding-top:30px}
  .home-left{padding-top:0}
  .home-ghost{display:none}
  .doors{margin-top:0}
  .wb-grid{grid-template-columns:1fr}
  .scan-layout{grid-template-columns:1fr;gap:34px}
  .scan-layout.has-result{grid-template-columns:1fr}
  .scan-detail{
    position:relative;top:auto;right:auto;bottom:auto;z-index:auto;
    width:auto;height:auto;min-height:0;max-height:none;
  }
  .scan-board{min-height:320px}
  .scan-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .scan-note{grid-template-columns:1fr;padding:16px 0}
  .sheet-grid{grid-template-columns:1fr;gap:26px}
  .sheet-col + .sheet-col{border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:26px}
  .login-wrap{grid-template-columns:1fr;gap:44px;padding-top:34px}
  .login-card{justify-self:start;max-width:520px}
  .profile-grid{grid-template-columns:1fr}
}
@media (min-width:1121px){
  .login-left{transform:translateY(-40px)}
  .login-left::before{top:-7px}
}
@media (max-width:760px){
  #topbar{height:70px;padding:0 18px}
  .brand-cn{font-size:18px;letter-spacing:.12em}
  .brand-en{display:none}
  .top-right{gap:14px}
  #topbar .today{display:none}
  .seal{width:34px;height:34px;font-size:11px}
  .user-name{display:none}
  .user-avatar{width:28px;height:28px}
  .page{padding:30px 18px 100px}
  .home{padding:26px 18px 80px}
  .home h1{font-size:clamp(48px,14vw,78px)}
  .home h1 .line{white-space:normal}
  .home-lede{font-size:14px;margin-top:24px}
  .home-meta{gap:24px}
  .door{grid-template-columns:32px 1fr 44px;gap:14px;padding:22px 2px}
  .door-title{font-size:25px}
  .door-art{width:44px}
  .page-head{grid-template-columns:1fr;gap:10px}
  .page-no{display:none}
  .page-head h1{font-size:44px}
  .page-head .lead{gap:12px;flex-wrap:wrap}
  .dropzone{min-height:360px}
  .drop-title{font-size:32px}
  .scan-notes{grid-template-columns:1fr}
  .scan-board{padding:8px}
  .scan-stage img{max-height:54vh}
  .sheet-top{padding:10px 14px 12px;gap:10px;flex-wrap:wrap}
  .sheet-body{padding:18px 14px 30px}
  .wb-summary b{font-size:27px}
  .wb-toolbar{gap:10px}
  .start-btn{margin-left:auto}
  .wb-card{padding:20px 18px 16px}
  .result-page{padding:40px 18px 100px}
  .result-hero{grid-template-columns:1fr}
  .result-hero .stamp{display:none}
  .result-stats b{font-size:30px}
  .result-row{grid-template-columns:1fr;gap:10px}
  .result-row .r-state{justify-content:flex-start;text-align:left}
  .exam-bar{padding:0 14px;gap:12px}
  .exam-title{font-size:14px}
  .exam-sub{display:none}
  .paper-stage{width:900px}
  .paper-head{padding:40px 44px 24px}
  .paper-head h2{font-size:30px}
  .exam-q{padding:48px 44px 44px}
  .exam-q .qtext{font-size:17px}
  .ink-tools{left:12px;bottom:12px;right:12px;justify-content:space-between;gap:8px;padding:8px 10px}
  .ink-size input{width:56px}
  .finish-btn{right:12px;bottom:78px;min-width:120px;height:44px}
  .ink-hint{bottom:84px;font-size:8px}
  .login-wrap{padding:28px 18px 80px;min-height:calc(100vh - 70px);gap:34px;--login-pad:18px;--login-title:clamp(46px,13vw,72px)}
  .login-left h1{font-size:var(--login-title)}
  .login-card{max-width:none}
  .field-row{grid-template-columns:1fr}
  .profile-page{padding:28px 18px 80px}
  .profile-hero{grid-template-columns:1fr;gap:16px}
  .profile-avatar{width:72px;height:72px;font-size:26px}
  .profile-actions{flex-direction:row}
  .profile-actions .ghost-btn{flex:1}
  .profile-stats{grid-template-columns:1fr 1fr}
  .profile-stat:nth-child(2){border-right:0}
  .profile-stat:nth-child(3),.profile-stat:nth-child(4){border-top:1px solid var(--line)}
  .profile-grid{grid-template-columns:1fr}
}
@media (max-width:1180px){
  .book-page{animation:book-page-mobile-in 1.02s var(--ease) both}
  @keyframes book-page-mobile-in{from{opacity:0}to{opacity:1}}
  #view.mobile-page-leave{
    opacity:0;transform:translateY(26px);
    transition:opacity .64s ease,transform .68s var(--ease);pointer-events:none;
  }
  #view.mobile-page-leave-fade{
    opacity:0;transform:none;
    transition:opacity .58s ease;pointer-events:none;
  }
  #view.mobile-page-enter{animation:mobile-page-enter 1.04s var(--ease) both}
  @keyframes mobile-page-enter{
    from{opacity:0;transform:translateY(28px)}
    to{opacity:1;transform:none}
  }
  #topbar{
    position:sticky;top:0;z-index:55;height:64px;padding:0 16px;
    background:rgba(255,255,255,.97);backdrop-filter:blur(12px);
  }
  #topbar .brand-cn{font-size:19px;letter-spacing:.12em}
  .top-right{gap:12px}
  #topbar .today{display:none}
  .due-pill{font-size:10px;letter-spacing:.05em}
  .due-pill b{font-size:17px}
  .user-avatar{width:30px;height:30px}
  #view{min-height:calc(100dvh - 64px)}
  .page{padding:25px 16px 100px}
  .page-head{grid-template-columns:1fr;gap:13px}
  .page-head h1{font-size:37px}
  .page-head .sub{font-size:8.5px;letter-spacing:.13em}
  .home{padding:24px 16px 70px;gap:38px;min-height:0}
  .home-left{padding-top:0}
  .home-kicker{margin-bottom:22px}
  .home h1{font-size:clamp(48px,15vw,62px)}
  .feynman-quote{margin-top:25px;padding-left:16px}
  .feynman-quote p{font-size:14px;line-height:1.9}
  .home-meta{gap:24px;margin-top:34px}
  .home-meta b{font-size:25px}
  .doors{margin-top:6px}
  .door{grid-template-columns:28px minmax(0,1fr) 40px;gap:12px;padding:22px 0}
  .door-title{font-size:27px}
  .door-desc{font-size:10.5px;line-height:1.7}
  .door-art{width:40px}

  .scan-page{height:auto;min-height:calc(100dvh - 64px);padding:14px 14px 40px;overflow:visible}
  .scan-utility-bar{min-height:30px;margin-bottom:4px}
  .scan-page-head{padding-bottom:5px;margin-bottom:12px}
  .scan-page-head h1{font-size:33px}
  .scan-layout{gap:20px}
  .scan-layout:not(.has-result){height:auto;min-height:0}
  .scan-left-column{height:auto}
  .scan-left-column #scanArea{height:auto}
  .dropzone,.scan-busy{min-height:calc(100dvh - 250px);height:calc(100dvh - 250px)}
  .drop-icon{width:70px;height:70px;margin-bottom:20px}
  .drop-title{font-size:34px}
  .drop-actions{width:100%;padding:0 14px;gap:8px}
  .drop-actions .drop-cta{flex:0 0 auto;min-width:108px;justify-content:center;padding:11px 15px}
  .scan-board{min-height:300px;padding:8px}
  .scan-frame-nav{padding:8px 0 10px;gap:8px}
  .scan-frame{width:110px;min-width:110px}
  .scan-frame-thumb{width:98px;height:60px}
  .scan-detail{border-top:1px solid var(--line)}
  .sheet-top{position:sticky;top:64px;z-index:8;background:#fff;padding:9px 0 11px}
  .sheet-body{padding:15px 0 28px;overflow:visible}
  .scan-detail .sheet-grid{grid-template-columns:1fr;gap:20px}
  .scan-help-actions{position:sticky;bottom:12px;z-index:9;background:rgba(255,255,255,.96);padding:12px 0}
  .scan-answer-btn,.scan-ask-btn{height:42px}

  .wb-summary{margin-bottom:18px}
  .wb-summary div{padding:15px 10px}
  .wb-summary b{font-size:29px}
  .wb-summary span{font-size:8px;letter-spacing:.1em}
  .wb-toolbar{
    top:64px;display:grid;grid-template-columns:1fr 1fr;gap:8px;
    padding:9px 0 12px;margin:0 -2px;
  }
  #rangeSeg{grid-column:1/-1;width:100%}
  #rangeSeg button{flex:1;padding:9px 4px}
  .toolbar-spacer{display:none}
  .sort-group{grid-column:1/-1;overflow-x:auto;padding:2px 0;scrollbar-width:none}
  .sort-group::-webkit-scrollbar{display:none}
  .wb-toolbar>.ghost-btn{display:flex;align-items:center;justify-content:center;height:36px;padding:0 8px;text-decoration:none}
  #startReview{display:none}
  .mobile-start-review{
    position:fixed;left:16px;right:16px;bottom:max(14px,env(safe-area-inset-bottom));
    z-index:38;width:auto;height:48px;margin:0;display:flex;align-items:center;justify-content:center;gap:9px;
    border:1px solid var(--ink);background:var(--ink);color:#fff;font-size:12px;letter-spacing:.08em;
    box-shadow:0 10px 32px rgba(23,22,19,.18);
  }
  .mobile-start-review .count{
    display:inline-grid;place-items:center;min-width:19px;height:19px;padding:0 5px;
    background:#fff;color:var(--ink);border:1px solid #fff;font-family:var(--mono);font-size:9px;
  }
  .wb-select-row{padding:14px 0 5px}
  .wb-grid{gap:14px;padding-top:7px}
  .wb-card{min-height:0;padding:19px 17px 16px}
  .wb-card .qtext{font-size:15px;line-height:1.85}
  .wb-foot{gap:8px}
  .book-switcher{width:100%;display:grid;grid-template-columns:1fr 1fr;gap:8px}
  .book-switcher .ghost-btn{justify-content:center;display:flex;text-decoration:none}
  .help-book-note{margin-bottom:16px}
  #toast{bottom:82px}

  .modal-mask{align-items:end;padding:0}
  .modal{
    width:100%;max-height:92dvh;border-left:0;border-right:0;border-bottom:0;
    padding:24px 20px max(22px,env(safe-area-inset-bottom));
  }
  .scan-preview-modal img{max-height:62dvh}

  .exam-bar{height:54px;padding:0 12px;gap:9px}
  .exam-title{font-size:14px}
  .exam-sub{display:none}
  .orientation-toggle{padding:6px 8px;font-size:8.5px}
  .exam-progress{gap:7px}
  .exam-progress .bar{width:54px}
  .exam-progress b{display:none}
  .mobile-exam-hint{
    display:block;margin-left:auto;font-size:8px;letter-spacing:.06em;color:var(--muted-2);white-space:nowrap;
  }
  .exam-scroll{padding:12px 0 105px;touch-action:none}
  .paper-wrap{width:100%!important;height:auto!important}
  .paper-stage{width:100%!important;transform:none!important;box-shadow:none;padding-bottom:26px}
  .exam.orientation-portrait .paper-wrap{
    width:min(100vw,760px)!important;max-width:760px;margin-left:auto;margin-right:auto;
  }
  .exam.orientation-landscape .paper-wrap{
    width:max(100vw,900px)!important;max-width:none;
  }
  .paper-head{padding:24px 18px 18px}
  .paper-head h2{font-size:31px}
  .paper-head .ph-right{font-size:8px}
  .grading-banner{margin:0 18px;font-size:14px}
  .exam-q{padding:55px 18px 34px}
  .exam-q .q-meta{padding-right:0}
  .exam-mark,.cant-btn{left:14px;top:14px}
  .exam-q .qtext{font-size:16.5px;line-height:1.95}
  .exam-q .qopts li{font-size:15px;line-height:1.9}
  .grade-box{margin-top:22px;padding-top:20px}
  .paper-end{padding:50px 18px 36px}
  .paper-end b{font-size:32px}
  .ink-tools{
    left:12px;right:12px;bottom:max(10px,env(safe-area-inset-bottom));
    padding:8px 10px;gap:9px;justify-content:space-between;flex-wrap:wrap;
  }
  .ink-size input{width:62px}
  .ink-hint{display:none}
  .finish-btn{right:12px;bottom:78px;min-width:130px;height:44px}
  .rotate-hint{display:none!important}
}

@media (max-width:1180px){
  .compose-page{padding:22px 16px 132px}
  .compose-head{grid-template-columns:1fr auto;align-items:end}
  .compose-head h1{font-size:44px}
  .compose-basket-shortcut{font-size:9.5px}
  .compose-search{margin-top:16px}
  .compose-filter-row{margin-right:-16px;padding-right:16px}
  .compose-q-card{padding:19px 0}
  .compose-q-text{font-size:14.5px;line-height:1.8}
  .compose-bottom-bar,.compose-start-paper{width:calc(100vw - 24px);bottom:max(10px,env(safe-area-inset-bottom))}
  .compose-filter-modal{height:88dvh}
  .compose-basket-item{grid-template-columns:32px minmax(0,1fr);gap:10px}
  .compose-basket-actions{grid-column:2;justify-content:flex-start}
  .compose-basket-actions button{height:32px}
  .compose-done-page{padding:45px 18px 110px}
  .compose-done-page h1{font-size:48px}
  .compose-verdict{display:grid;grid-template-columns:1fr 1fr}
  .compose-verdict button:last-child{grid-column:1/-1}
  .compose-toggle span{display:none}
  .compose-toggle{padding:6px}
}

@media (orientation:portrait) and (max-width:900px){
  .rotate-hint{
    display:flex;position:fixed;inset:0;z-index:150;background:var(--paper);
    align-items:center;justify-content:center;flex-direction:column;gap:18px;text-align:center;padding:30px;
  }
  .rotate-hint .rot-icon{width:64px;height:64px;border:1px solid var(--ink);display:grid;place-items:center;font-size:26px}
  .rotate-hint b{font-family:var(--serif);font-size:30px;font-weight:700}
  .rotate-hint p{font-size:11px;line-height:1.9;color:var(--muted);max-width:300px}
  .rotate-hint button{margin-top:10px;padding:10px 18px;border:1px solid var(--line-2);font-size:10px;color:var(--muted)}
}
.exam.orientation-portrait .rotate-hint{display:none!important}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

@media (max-width:1180px){
  #view.mobile-page-leave{transition-duration:.68s !important}
  #view.mobile-page-leave-fade{transition-duration:.7s !important}
  #view.mobile-page-enter{animation-duration:1.04s !important}
}

@media (max-height:520px) and (orientation:landscape){
  .exam-bar{height:46px;gap:12px;padding:0 14px}
  .exam-title{font-size:14px}
  .exam-sub{display:none}
  .orientation-toggle{padding:5px 7px;font-size:8px}
  .exam-progress .bar{width:90px}
  .exam-scroll{padding:14px 0 92px}
  .paper-head{padding:24px 44px 16px}
  .paper-head h2{font-size:26px}
  .paper-head .ph-right{font-size:7.5px}
  .exam-q{padding:38px 44px 32px}
  .exam-q .qtext{font-size:16.5px;line-height:1.95}
  .cant-btn{top:10px;left:10px;padding:5px 8px;font-size:8.5px}
  .ink-tools{left:8px;bottom:8px;padding:6px 8px;gap:8px}
  .ink-size input{width:54px}
  .ink-hint{display:none}
  .finish-btn{right:8px;bottom:8px;min-width:112px;height:40px;font-size:10px}
}