/* ============ 小狐数学 · 设计系统（浅色主题） ============ */
:root{
  --primary:#6366f1; --primary-d:#4f46e5; --primary-l:#eef2ff;
  --accent:#f97316; --accent-l:#fff7ed;
  --green:#10b981; --green-l:#ecfdf5;
  --amber:#f59e0b; --amber-l:#fffbeb;
  --red:#ef4444; --red-l:#fef2f2;
  --bg:#f5f6fb; --card:#fff;
  --text:#1e293b; --muted:#64748b; --faint:#94a3b8;
  --line:#e8eaf2; --line-s:#f1f2f7;
  --r:14px; --r-s:10px;
  --sh:0 1px 2px rgba(16,24,40,.04),0 4px 14px rgba(16,24,40,.05);
  --sh-l:0 4px 12px rgba(16,24,40,.06),0 16px 40px rgba(16,24,40,.08);
  --sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
/* 全局兜底：任何带 hidden 属性的元素都隐藏（防止 .modal{display:grid} 之类规则让遮罩卡在显示态） */
[hidden]{display:none!important}
body{
  font-family:var(--sans); background:var(--bg); color:var(--text);
  font-size:14px; line-height:1.6;
}
/* 防御性规则：确保主交互区域永远可点击 */
.app,.main,.sidebar,.views,.view,.view.active,
.nav,.tabbar,.nav-item,.tab,.card,.btn,
button,input,select,textarea,[role=button],[onclick]{pointer-events:auto!important}
#modal[hidden]{display:none!important;pointer-events:none!important}
#toast:not(.show){pointer-events:none!important}
#printArea{display:none!important;pointer-events:none!important}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
h1,h2,h3,h4{margin:0;font-weight:650}
a{color:var(--primary);text-decoration:none}

/* ---------- 布局 ---------- */
.app{display:flex;min-height:100vh}
.sidebar{
  width:214px;flex:0 0 214px;background:#fff;border-right:1px solid var(--line);
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh;
}
.brand{display:flex;align-items:center;gap:10px;padding:18px 16px 14px}
.brand-logo{
  width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-size:21px;
  background:linear-gradient(135deg,#fff1e6,#ffe4d1);box-shadow:inset 0 0 0 1px #ffd9bd;
}
.brand-txt strong{display:block;font-size:15px;letter-spacing:.2px}
.brand-txt small{display:block;font-size:11px;color:var(--faint);margin-top:-1px}

.nav{display:flex;flex-direction:column;gap:2px;padding:6px 10px;flex:1}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:9px 11px;border:0;border-radius:var(--r-s);
  background:transparent;cursor:pointer;color:var(--muted);font-size:13.5px;font-weight:500;
  text-align:left;transition:.15s;position:relative;
}
.nav-item:hover{background:var(--line-s);color:var(--text)}
.nav-item.active{background:var(--primary-l);color:var(--primary-d);font-weight:600}
.nav-item .ni{font-size:15px;width:18px;text-align:center}
.nav-item .badge{
  margin-left:auto;font-style:normal;font-size:11px;background:var(--line);color:var(--muted);
  padding:1px 6px;border-radius:20px;min-width:18px;text-align:center;
}
.nav-item.active .badge{background:#fff;color:var(--primary-d)}

.side-foot{padding:10px 12px 14px}
.side-card{
  background:linear-gradient(135deg,var(--primary),#818cf8);color:#fff;border-radius:var(--r);
  padding:12px 14px;cursor:pointer;transition:.15s;
}
.side-card:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(99,102,241,.3)}
.side-card-t{font-size:11.5px;opacity:.85}
.side-card-n{font-size:26px;font-weight:750;line-height:1.15}
.side-card-s{font-size:11.5px;opacity:.85}
.side-tip{font-size:10.5px;color:var(--faint);margin-top:10px;line-height:1.5}

.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 26px 14px;position:sticky;top:0;z-index:20;
  background:#f5f6fb;
}
.page-title{font-size:20px}
.page-sub{margin:1px 0 0;font-size:12.5px;color:var(--muted)}
.topbar-right{display:flex;align-items:center;gap:10px}
.who{font-size:12.5px;color:var(--muted);background:#fff;border:1px solid var(--line);padding:5px 11px;border-radius:20px}
.who:empty{display:none}

/* 学期教材选择器（顶栏） */
.book-picker{
  display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);
  padding:5px 12px;border-radius:20px;font-size:12.5px;cursor:pointer;
}
.book-picker select{
  border:0;background:transparent;padding:0;width:auto;min-width:0;outline:0;
  font-size:12.5px;font-weight:600;color:var(--primary-d);cursor:pointer;
}
.book-picker select:focus{box-shadow:none;border:0}

/* 录题：单元快捷选择 */
.unit-chips{display:flex;flex-wrap:wrap;gap:7px}
.unit-chip{
  border:1px solid var(--line);background:#fff;padding:5px 12px;border-radius:18px;
  cursor:pointer;font-size:12.5px;color:var(--muted);transition:.15s;
}
.unit-chip:hover{border-color:#cbd5e1;background:#f8fafc}
.unit-chip.on{background:var(--primary);color:#fff;border-color:transparent;font-weight:600}

/* 错题卡片：单元小标签 */
.mcard-unit{
  display:inline-block;margin-left:6px;padding:0 7px;border-radius:10px;
  font-size:10.5px;font-weight:500;background:var(--primary-l);color:var(--primary-d);
  vertical-align:1px;white-space:nowrap;max-width:110px;overflow:hidden;text-overflow:ellipsis;
}

.views{padding:4px 26px 40px;display:flex;flex-direction:column}
.view{display:none;flex-direction:column;gap:16px}
.view.active{display:flex;animation:fade .22s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- 通用组件 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;box-shadow:var(--sh)}
.card-h{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.card-h h3{font-size:14.5px}
.card-h .hint,.hint{font-size:11.5px;color:var(--faint)}
.card-h-x{font-size:12px;color:var(--muted)}
.muted{color:var(--muted);font-size:12.5px}
.link{font-size:12.5px;cursor:pointer}
.row-gap{display:flex;gap:8px;flex-wrap:wrap;align-items:center}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid-add{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
.grid-paper{display:grid;grid-template-columns:minmax(320px,400px) 1fr;gap:16px;align-items:start}

.btn{
  border:1px solid transparent;background:var(--primary);color:#fff;padding:8px 15px;
  border-radius:var(--r-s);cursor:pointer;font-size:13px;font-weight:600;transition:.15s;white-space:nowrap;
}
.btn:hover{background:var(--primary-d)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-sm{padding:6px 11px;font-size:12.5px}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--muted)}
.btn-ghost:hover{background:var(--line-s);color:var(--text);border-color:#dcdfeb}
.btn-danger-ghost{background:#fff;border-color:#fecaca;color:var(--red)}
.btn-danger-ghost:hover{background:var(--red-l)}
.btn-col{display:flex;flex-direction:column;gap:8px}
.btn-col .btn{text-align:left}
.actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}

/* 表单 */
.field{margin-bottom:13px;min-width:0}
.field>label{display:block;font-size:12.5px;font-weight:600;color:var(--muted);margin-bottom:6px}
.field .opt{font-weight:400;color:var(--faint);font-size:11.5px}
.field .req{color:var(--red)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
input[type=text],input:not([type]),input[type=search],select,textarea{
  width:100%;padding:8px 11px;border:1px solid var(--line);border-radius:var(--r-s);
  background:#fff;outline:0;transition:.15s;font-size:13.5px;
}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,102,241,.12)}
textarea{resize:vertical;line-height:1.65}
input[type=range]{width:100%;accent-color:var(--primary)}

.seg{display:inline-flex;background:var(--line-s);border-radius:9px;padding:3px;gap:2px}
.seg.wide{display:flex}
.seg button{
  border:0;background:transparent;padding:6px 13px;border-radius:7px;cursor:pointer;
  font-size:12.5px;color:var(--muted);font-weight:500;transition:.15s;flex:1;
}
.seg button.on{background:#fff;color:var(--primary-d);font-weight:650;box-shadow:0 1px 3px rgba(16,24,40,.1)}
.mode-desc{margin:7px 0 0;font-size:11.5px;color:var(--faint);line-height:1.5}

.checks{display:flex;gap:14px;flex-wrap:wrap}
.chk{display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--muted);cursor:pointer}
.chk input{width:15px;height:15px;accent-color:var(--primary);cursor:pointer}

.reasons{display:flex;flex-wrap:wrap;gap:7px}
.reason-chip{
  border:1px solid var(--line);background:#fff;padding:6px 12px;border-radius:20px;
  cursor:pointer;font-size:12.5px;color:var(--muted);transition:.15s;
}
.reason-chip:hover{border-color:#cbd5e1}
.reason-chip.on{color:#fff;border-color:transparent;font-weight:600}

.suggest{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:7px}
.sg-label{font-size:11.5px;color:var(--faint);align-self:center;margin-right:2px}
.sg-chip{
  border:1px dashed var(--primary);background:var(--primary-l);color:var(--primary-d);
  padding:4px 10px;border-radius:16px;cursor:pointer;font-size:12px;transition:.15s;
}
.sg-chip:hover{background:#e0e7ff}

/* 知识点搜索筛选（录入页归类） */
.topic-filter{margin-top:2px}
.tf-input{margin-bottom:7px}
.tf-selected{margin-bottom:7px;font-size:12.5px;color:var(--muted);background:var(--primary-l);border:1px solid #c7d2fe;border-radius:8px;padding:6px 10px;display:flex;align-items:center;gap:8px}
.tf-selected b{color:var(--primary-d)}
.tf-clear{margin-left:auto;border:1px solid var(--line);background:#fff;color:var(--muted);font-size:12px;padding:3px 9px;border-radius:14px;cursor:pointer}
.tf-clear:hover{color:var(--red);border-color:#fecaca}
.tf-list{max-height:230px;overflow:auto;border:1px solid var(--line);border-radius:10px;padding:6px;background:#fff}
.tf-group{margin-bottom:2px}
.tf-ghead{font-size:11px;font-weight:700;color:var(--faint);padding:4px 6px 2px;letter-spacing:.3px}
.tf-items{display:flex;flex-wrap:wrap;gap:6px;padding:0 2px 5px}
.tf-item{border:1px solid var(--line);background:#fff;padding:5px 11px;border-radius:16px;cursor:pointer;font-size:12.5px;color:var(--muted);transition:.15s}
.tf-item:hover{border-color:#cbd5e1;background:#f8fafc}
.tf-item.on{background:var(--primary);color:#fff;border-color:transparent;font-weight:600}
.tf-empty{font-size:12.5px;color:var(--faint);text-align:center;padding:18px 10px}

/* ---------- KPI ---------- */
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.kpi{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:15px 17px;box-shadow:var(--sh);position:relative;overflow:hidden}
.kpi-t{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:5px}
.kpi-n{font-size:29px;font-weight:750;line-height:1.25;letter-spacing:-.5px}
.kpi-s{font-size:11.5px;color:var(--faint)}
.kpi-s b{font-weight:600}
.kpi .up{color:var(--red)} .kpi .down{color:var(--green)}
.kpi::after{content:"";position:absolute;right:-14px;top:-14px;width:66px;height:66px;border-radius:50%;opacity:.09}
.kpi.c1::after{background:var(--primary)} .kpi.c2::after{background:var(--green)}
.kpi.c3::after{background:var(--accent)} .kpi.c4::after{background:var(--amber)}

.chart-box{min-height:60px}

/* ---------- 薄弱知识点 ---------- */
.weak-list{display:flex;flex-direction:column;gap:11px}
.weak-item{display:flex;align-items:center;gap:11px}
.weak-rank{
  width:22px;height:22px;border-radius:7px;display:grid;place-items:center;
  font-size:11.5px;font-weight:700;background:var(--line-s);color:var(--muted);flex:0 0 auto;
}
.weak-item:nth-child(1) .weak-rank{background:#fee2e2;color:#dc2626}
.weak-item:nth-child(2) .weak-rank{background:#ffedd5;color:#ea580c}
.weak-item:nth-child(3) .weak-rank{background:#fef3c7;color:#d97706}
.weak-body{flex:1;min-width:0}
.weak-name{font-size:13px;font-weight:600;display:flex;justify-content:space-between;gap:8px}
.weak-name em{font-style:normal;font-size:11.5px;color:var(--faint);font-weight:500}
.weak-bar{height:6px;background:var(--line-s);border-radius:4px;overflow:hidden;margin-top:5px}
.weak-bar i{display:block;height:100%;border-radius:4px}
.weak-meta{font-size:11px;color:var(--faint);margin-top:3px}

/* 分析表格 */
.wtable{width:100%;border-collapse:collapse;font-size:13px}
.wtable th{
  text-align:left;font-size:11.5px;color:var(--faint);font-weight:600;
  padding:7px 10px;border-bottom:1px solid var(--line);white-space:nowrap;
}
.wtable td{padding:9px 10px;border-bottom:1px solid var(--line-s);vertical-align:middle}
.wtable tr:last-child td{border-bottom:0}
.wtable tr:hover td{background:#fafbff}
.pill{display:inline-block;padding:2px 8px;border-radius:20px;font-size:11px;font-weight:600}
.pill.high{background:var(--red-l);color:#dc2626}
.pill.mid{background:var(--amber-l);color:#d97706}
.pill.low{background:var(--green-l);color:#059669}
.tag{display:inline-block;padding:1px 7px;border-radius:5px;font-size:11px;background:var(--line-s);color:var(--muted)}

.donut-wrap{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.legend{display:flex;flex-direction:column;gap:7px;flex:1;min-width:150px}
.lg-item{display:flex;align-items:center;gap:8px;font-size:12.5px}
.lg-dot{width:9px;height:9px;border-radius:3px;flex:0 0 auto}
.lg-name{flex:1}
.lg-n{color:var(--muted);font-size:12px}
.lg-tip{font-size:11px;color:var(--faint);margin-left:17px;margin-top:-4px}

/* ---------- 上传 ---------- */
.dropzone{
  border:2px dashed #d5d9e8;border-radius:var(--r);padding:26px 18px;text-align:center;
  cursor:pointer;transition:.18s;background:#fcfcfe;outline:0;
}
.dropzone:hover,.dropzone:focus,.dropzone.over{border-color:var(--primary);background:var(--primary-l)}
.dz-icon{font-size:30px;line-height:1}
.dz-t{font-size:13.5px;font-weight:600;margin-top:7px}
.dz-s{font-size:11.5px;color:var(--faint);margin-top:2px}

.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:9px;margin-top:11px}
.thumbs:empty{display:none}
.thumb{position:relative;border-radius:var(--r-s);overflow:hidden;border:1px solid var(--line);aspect-ratio:1;background:#f8fafc}
.thumb img{width:100%;height:100%;object-fit:cover;display:block;cursor:zoom-in}
.thumb-ops{position:absolute;inset:auto 0 0 0;display:flex;background:rgba(15,23,42,.72);opacity:0;transition:.15s}
.thumb:hover .thumb-ops{opacity:1}
.thumb-ops button{flex:1;border:0;background:transparent;color:#fff;padding:5px 0;cursor:pointer;font-size:11.5px}
.thumb-ops button:hover{background:rgba(255,255,255,.16)}

.ocr-row{display:flex;align-items:center;gap:10px;margin-top:11px;flex-wrap:wrap}
.ocr-status{font-size:11.5px;color:var(--muted);flex:1;min-width:120px}
.ocr-bar{height:4px;background:var(--line-s);border-radius:3px;overflow:hidden;margin-top:4px}
.ocr-bar i{display:block;height:100%;background:var(--primary);border-radius:3px;transition:width .3s}

/* ---------- 整张卷提取 ---------- */
.add-tabs{margin:0 0 14px}
#paperPanel .card{margin-bottom:14px}
#paperCandidates{display:flex;flex-direction:column;gap:13px}
.paper-cand{
  border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:13px 14px;
  box-shadow:var(--sh);transition:.18s;
}
.paper-cand.removed{opacity:.45}
.pc-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
.pc-keep{display:flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--text);cursor:pointer}
.pc-keep input{width:16px;height:16px;accent-color:var(--primary);cursor:pointer}
.pc-del{border:0;background:transparent;color:var(--faint);font-size:15px;cursor:pointer;padding:2px 6px;border-radius:8px}
.pc-del:hover{background:var(--red-l);color:var(--red)}
.pc-body{display:flex;flex-direction:column;gap:9px}
.pc-field{display:flex;flex-direction:column;gap:4px;flex:1;min-width:0}
.pc-field>label{font-size:11.5px;font-weight:600;color:var(--muted)}
.pc-row{display:flex;gap:10px;flex-wrap:wrap}
.pc-text,.pc-field input,.pc-field select,.paper-cand textarea{
  width:100%;padding:7px 9px;font-size:13px;border:1px solid var(--line);border-radius:var(--r-s);
  background:#fff;color:var(--text);font-family:inherit;
}
.paper-cand textarea{resize:vertical;line-height:1.5}
.pc-raw{margin-top:2px}
.pc-raw summary{cursor:pointer;font-size:11.5px;color:var(--faint);width:max-content}
.pc-raw pre{
  white-space:pre-wrap;word-break:break-word;background:var(--line-s);border-radius:var(--r-s);
  padding:9px 10px;font-size:11.5px;color:var(--muted);margin:6px 0 0;max-height:160px;overflow:auto;font-family:var(--sans);
}
.pc-acts{display:flex;align-items:center;gap:6px}
.pc-view{border:1px solid var(--line);background:#fff;color:var(--primary-d);font-size:12px;font-weight:600;
  padding:3px 9px;border-radius:8px;cursor:pointer;white-space:nowrap}
.pc-view:hover{background:var(--indigo-l);border-color:var(--primary)}
.pc-view:disabled{color:var(--faint);cursor:not-allowed;background:#fff;border-color:var(--line)}
.pc-graph{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--primary-d);
  background:var(--indigo-l);border:1px solid var(--primary);border-radius:8px;padding:5px 9px;margin-bottom:9px}
.pc-graph::before{content:"📷"}

/* 整卷原图定位灯箱 */
.md-lb{max-width:780px}
.md-lb .md-f{justify-content:flex-end}
.lb-wrap{position:relative;display:block;width:fit-content;max-width:100%;margin:6px auto;line-height:0;cursor:zoom-in}
.lb-img{display:block;max-width:100%;max-height:62vh;width:auto;border-radius:10px;background:#fff}
.lb-wrap.zoomed .lb-img{max-height:none;width:auto;cursor:zoom-out}
.lb-rect{position:absolute;border:3px solid #ef4444;background:rgba(239,68,68,.10);
  box-shadow:0 0 0 9999px rgba(15,23,42,.22);box-sizing:border-box;pointer-events:none;border-radius:3px}
.lb-tip{font-size:12px;color:var(--faint);margin-top:8px}

/* ---------- 错题本 ---------- */
.filters{display:flex;gap:9px;flex-wrap:wrap;align-items:center}
.fl{width:auto;min-width:112px;padding:7px 10px;font-size:12.5px}
.fl-search{flex:1;min-width:200px;padding:7px 12px;font-size:13px}
.book-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:12px;padding-top:12px;border-top:1px solid var(--line-s);flex-wrap:wrap}

.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(252px,1fr));gap:14px}
.mcard{
  background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;
  box-shadow:var(--sh);cursor:pointer;transition:.18s;display:flex;flex-direction:column;
}
.mcard:hover{transform:translateY(-2px);box-shadow:var(--sh-l);border-color:#d9dcea}
.mcard.done{opacity:.62}
.mcard-img{height:118px;background:#f1f5f9;position:relative;overflow:hidden}
.mcard-img img{width:100%;height:100%;object-fit:cover;display:block}
.mcard-img.no{display:grid;place-items:center;font-size:26px;color:#cbd5e1}
.mcard-badge{
  position:absolute;top:7px;right:7px;background:rgba(16,185,129,.94);color:#fff;
  font-size:10.5px;padding:2px 8px;border-radius:20px;font-weight:600;
}
.mcard-b{padding:11px 12px;flex:1;display:flex;flex-direction:column;gap:6px}
.mcard-topic{font-size:12.5px;font-weight:650;color:var(--primary-d)}
.mcard-text{
  font-size:12px;color:var(--muted);line-height:1.55;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.mcard-f{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:auto;padding-top:2px}
.mcard-f .dot{width:6px;height:6px;border-radius:50%;flex:0 0 auto}
.mcard-f small{font-size:11px;color:var(--faint)}
.stars{color:var(--amber);font-size:11px;letter-spacing:.5px}

/* 详情弹窗 */
.modal{position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:20px}
.modal-mask{position:absolute;inset:0;background:rgba(15,23,42,.55)}
.modal-box{
  position:relative;background:#fff;border-radius:16px;max-width:660px;width:100%;
  max-height:88vh;overflow:auto;box-shadow:0 24px 60px rgba(2,6,23,.3);animation:pop .2s ease;
}
@keyframes pop{from{opacity:0;transform:scale(.97) translateY(8px)}to{opacity:1;transform:none}}
.md-h{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;z-index:2}
.md-h h3{font-size:15px}
.md-x{border:0;background:var(--line-s);width:28px;height:28px;border-radius:8px;cursor:pointer;color:var(--muted);font-size:15px}
.md-x:hover{background:var(--line)}
.md-b{padding:18px 20px}
.md-f{display:flex;justify-content:space-between;gap:8px;padding:14px 20px;border-top:1px solid var(--line);position:sticky;bottom:0;background:#fff;flex-wrap:wrap}
.md-imgs{display:flex;gap:9px;overflow-x:auto;margin-bottom:14px;padding-bottom:4px}
.md-imgs img{max-height:250px;border-radius:var(--r-s);border:1px solid var(--line);cursor:zoom-in}
.md-row{display:flex;gap:10px;padding:8px 0;border-bottom:1px solid var(--line-s);font-size:13px}
.md-row:last-child{border-bottom:0}
.md-k{width:74px;flex:0 0 auto;color:var(--faint);font-size:12.5px}
.md-v{flex:1;min-width:0;word-break:break-word}
.md-explain{margin:14px 0 4px;background:linear-gradient(180deg,#f5f7ff,#eef2ff);border:1px solid var(--line-s);border-radius:12px;overflow:hidden}
.mde-h{font-size:13.5px;font-weight:700;color:#4338ca;padding:10px 14px;background:rgba(99,102,241,.08);border-bottom:1px solid var(--line-s)}
.mde-sec{padding:10px 14px;border-bottom:1px dashed var(--line-s)}
.mde-sec:last-child{border-bottom:0}
.mde-t{font-size:12.5px;font-weight:700;color:#4f46e5;margin-bottom:3px}
.mde-b{font-size:13px;line-height:1.7;color:#1f2937}
.lightbox{position:fixed;inset:0;background:rgba(2,6,23,.9);z-index:300;display:grid;place-items:center;cursor:zoom-out;padding:24px}
.lightbox img{max-width:100%;max-height:100%;border-radius:8px}

/* 复习计划 */
.plan-row{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--line-s)}
.plan-row:last-child{border-bottom:0}
.plan-when{width:82px;flex:0 0 auto;font-size:12px;font-weight:650}
.plan-when.od{color:var(--red)} .plan-when.td{color:var(--accent)} .plan-when.up{color:var(--muted)}
.plan-body{flex:1;min-width:0;font-size:12.5px}
.plan-body b{font-weight:600}
.plan-n{font-size:12px;color:var(--faint)}

.due-item{display:flex;align-items:center;gap:11px;padding:9px 0;border-bottom:1px solid var(--line-s);cursor:pointer}
.due-item:last-child{border-bottom:0}
.due-item:hover{background:#fafbff}
.due-thumb{width:42px;height:42px;border-radius:8px;object-fit:cover;background:#f1f5f9;flex:0 0 auto}
.due-thumb.no{display:grid;place-items:center;font-size:17px;color:#cbd5e1}
.due-body{flex:1;min-width:0}
.due-t{font-size:13px;font-weight:600}
.due-s{font-size:11.5px;color:var(--faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* 知识点选择器 */
.topic-picker{max-height:270px;overflow:auto;border:1px solid var(--line);border-radius:var(--r-s);padding:10px}
.tp-area{font-size:11px;color:var(--faint);font-weight:650;margin:9px 0 6px}
.tp-area:first-child{margin-top:0}
.tp-list{display:flex;flex-wrap:wrap;gap:6px}
.tp-chip{
  border:1px solid var(--line);background:#fff;padding:4px 10px;border-radius:16px;
  cursor:pointer;font-size:12px;color:var(--muted);transition:.15s;position:relative;
}
.tp-chip:hover{border-color:#c7cbdb}
.tp-chip.on{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}
.tp-chip .w{
  position:absolute;top:-4px;right:-4px;width:7px;height:7px;border-radius:50%;background:var(--red);
}

.topic-overview{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.to-area h4{font-size:12px;color:var(--primary-d);margin-bottom:7px}
.to-area ul{margin:0;padding-left:16px;font-size:12.5px;color:var(--muted);line-height:1.85}

.usage{display:flex;gap:16px;flex-wrap:wrap;padding:11px 13px;background:var(--line-s);border-radius:var(--r-s);margin-bottom:13px}
.usage div{font-size:12px;color:var(--muted)}
.usage b{display:block;font-size:17px;color:var(--text);font-weight:700}
.tip{font-size:11.5px;color:var(--faint);margin:11px 0 0;line-height:1.6}

/* 试卷预览 */
.preview-card{display:flex;flex-direction:column;min-height:520px}
.preview-scroll{flex:1;overflow:auto;background:#eceef6;border-radius:var(--r-s);padding:16px;max-height:calc(100vh - 220px)}
.paper-preview{background:#fff;margin:0 auto;max-width:794px;box-shadow:0 2px 14px rgba(16,24,40,.13);border-radius:3px}
.paper-preview .empty{padding:70px 20px}

.empty{text-align:center;color:var(--faint);padding:36px 20px}
.empty-i{font-size:38px;margin-bottom:8px}
.empty p{font-size:13px;margin:0;line-height:1.75}

.toast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,20px);z-index:400;
  background:#1e293b;color:#fff;padding:10px 18px;border-radius:10px;font-size:13px;
  opacity:0;pointer-events:none;transition:.25s;box-shadow:0 10px 30px rgba(2,6,23,.28);max-width:80vw;
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.err{background:#dc2626}
.toast.ok{background:#059669}

.tabbar{display:none}
.tab i{font-style:normal}
#printArea{display:none}

/* 竖式分数（题目中的 \f{a}{b}） */
.fr{display:inline-flex;flex-direction:column;vertical-align:-0.45em;text-align:center;margin:0 2px;line-height:1.05}
.fr i{font-style:normal;font-size:.82em;padding:0 3px;border-bottom:1.2px solid currentColor}
.fr b{font-weight:400;font-size:.82em;padding:0 3px}

/* ---------- 响应式 · 电脑 / iPad / 手机三端适配 ---------- */
/* === 桌面窄屏 / iPad 横屏（1025-1240）=== */
@media (max-width:1240px){
  .grid-paper{grid-template-columns:1fr}       /* 出题：设置在上、预览在下 */
  .preview-scroll{max-height:560px}
}
@media (max-width:1100px){
  .kpis{grid-template-columns:repeat(2,1fr)}
  .preview-card{min-height:0}
}

/* === iPad 竖屏 / 窄屏笔记本（768-1024）：侧栏收窄为图标栏，内容收敛 === */
@media (max-width:1024px) and (min-width:768px){
  /* 侧栏：折叠成仅图标的紧凑栏，腾出横向空间给内容 */
  .sidebar{width:70px;flex:0 0 70px}
  .brand{justify-content:center;padding:16px 6px 12px}
  .brand-txt{display:none}
  .brand-logo{width:40px;height:40px;font-size:22px}
  .nav{padding:6px 8px}
  .nav-item{justify-content:center;padding:11px 6px;font-size:0}
  .nav-item .ni{width:auto;font-size:21px}
  .nav-item .badge{display:none}              /* 竖屏空间不足，隐藏角标 */
  .side-foot{padding:10px 8px}
  .side-card{display:none}
  .side-tip{display:none}
  /* 内容区留白收窄 */
  .views{padding:4px 18px 40px}
  .topbar{padding:16px 18px 12px}
  .grid-2,.grid-add{grid-template-columns:1fr}
  .grid-paper{grid-template-columns:1fr}
  .preview-scroll{max-height:none}
}

/* === 手机 / 竖屏窄屏（≤767）=== */
@media (max-width:767px){
  .sidebar{display:none}
  html,body{overflow-x:hidden}                 /* 兜底：禁止任何水平滚动 */
  .main{width:100%;min-width:0}
  .views{padding:4px 12px calc(78px + env(safe-area-inset-bottom))}
  .topbar{
    padding:12px 12px 8px;gap:8px;flex-wrap:wrap;position:sticky;top:0;
    background:rgba(245,246,251,.92);backdrop-filter:blur(6px);
  }
  .topbar>div:first-child{flex:1;min-width:0}
  .topbar-right{flex-shrink:1;min-width:0;max-width:100%;flex-wrap:wrap;justify-content:flex-end}
  .page-title{font-size:17px}
  .page-sub{font-size:11.5px}
  .page-title,.page-sub{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  /* 顶部操作：学生chip藏起，学期选择与「录错题」并排可点 */
  .who{display:none}
  .book-picker{padding:5px 9px;font-size:12px}
  .book-picker select{max-width:108px;font-size:12px}
  #btnQuickAdd{font-size:12.5px;padding:6px 10px;white-space:nowrap}
  .topbar-right{gap:6px}

  .field-row{grid-template-columns:1fr}
  .kpis{gap:10px}
  .kpi{padding:13px 14px}
  .kpi-n{font-size:24px}
  .card{padding:13px 13px}
  .card-h{gap:8px;flex-wrap:wrap}
  .row-gap{flex-wrap:wrap}
  /* 卡片头部：标题占满一行，操作按钮组换行后占满整行 */
  .card-h>.row-gap{flex:1;min-width:0;width:100%;justify-content:flex-end}
  .row-gap .btn{
    flex:1 1 auto;min-width:0;max-width:100%;
    white-space:normal;line-height:1.35;text-align:center;justify-content:center;
  }
  .book-grid{grid-template-columns:repeat(auto-fill,minmax(148px,1fr));gap:11px}
  .mcard-img{height:104px}
  .mcard-b{padding:9px 10px}
  .grid-2,.grid-add,.grid-paper{grid-template-columns:1fr;gap:12px}

  /* 表单与触控目标放大 */
  input[type=text],input:not([type]),input[type=search],select,textarea{padding:10px 11px;font-size:15px}
  .btn{padding:10px 15px;font-size:14px}
  .btn-sm{padding:8px 12px;font-size:13px}
  .reason-chip,.unit-chip,.tf-item,.tp-chip,.sg-chip{padding:8px 13px;font-size:13px}
  .unit-chip,.reason-chip{margin-bottom:2px}
  .seg button{padding:9px 8px;font-size:13px}

  /* 顶部指标卡：手机两列足够，避免过挤 */
  .kpis{grid-template-columns:repeat(2,1fr)}

  /* 底部导航：6 项等宽，支持安全区 */
  .tabbar{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;background:rgba(255,255,255,.97);
    backdrop-filter:blur(8px);border-top:1px solid var(--line);
    padding:4px 0 calc(4px + env(safe-area-inset-bottom));
    box-shadow:0 -4px 18px rgba(16,24,40,.06);
    box-sizing:border-box;width:100%;
  }
  .tab{
    flex:1 1 0;min-width:0;border:0;background:transparent;display:flex;flex-direction:column;align-items:center;gap:1px;
    font-size:9px;color:var(--faint);cursor:pointer;padding:3px 2px;border-radius:9px;
    -webkit-tap-highlight-color:transparent;overflow:hidden;
  }
  .tab i{font-style:normal;font-weight:500;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .tab span{font-size:18px;line-height:1.15}
  .tab.active{color:var(--primary-d);font-weight:700}
  .tab.active i{color:var(--primary-d)}
  .tab.active{background:linear-gradient(180deg,var(--primary-l),transparent)}

  .preview-scroll{max-height:none;padding:10px;overflow:visible}
  .paper-preview{max-width:100%}

  /* 弹窗：底部抽屉式，提升单手持机体验 */
  .modal{padding:0;align-items:flex-end}
  .modal-box{max-height:94vh;border-radius:16px 16px 0 0;width:100%}
  .md-h{padding:13px 14px}
  .md-b{padding:14px 14px}
  .md-f{padding:12px 14px;gap:10px}
  .md-f .btn{flex:1;justify-content:center}
  .md-k{width:64px}
  .lightbox{padding:12px}

  /* 错题本筛选与工具栏：整排换行并给足间距 */
  .filters{gap:8px}
  .fl{flex:1 1 auto;min-width:0;font-size:13px}
  .fl-search{flex:1 1 100%;order:-1;min-width:0}
  .book-bar{gap:10px}
  .book-bar .row-gap{width:100%}
  .book-bar .row-gap .btn{flex:1;text-align:center}
  .book-bar .row-gap .chk{flex:1 1 100%;justify-content:flex-start;padding:3px 2px}
  .book-bar>span{margin-right:auto}

  /* 分析表格：小屏横向滚动，保证信息可读 */
  #weakTable,.wtable-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .wtable{min-width:560px}

  /* 知识点覆盖、单元 chips、候选题目列表细节 */
  .topic-overview{grid-template-columns:1fr 1fr;gap:10px}
  .tf-list{max-height:none}
  .to-area ul{padding-left:14px}

  /* 整卷候选：字段纵向堆叠更友好 */
  .pc-row{flex-direction:column;gap:8px}
  .actions{position:sticky;bottom:calc(70px + env(safe-area-inset-bottom));z-index:5;
    background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-radius:12px;
    padding:8px;margin:-4px -2px 2px;box-shadow:0 -2px 14px rgba(16,24,40,.07)}
  .actions .btn{flex:1;text-align:center;justify-content:center}

  /* 裁剪 / 分题编辑器全屏化，触摸区大 */
  .crop-ov,.crop-box{padding:0}
  .crop-box{max-width:100vw;max-height:100vh;width:100%;height:100%;border-radius:0}
  .crop-stage{max-width:94vw;margin:12px auto}
  .crop-f{padding:12px 12px calc(12px + env(safe-area-inset-bottom));flex-wrap:wrap}
  .crop-f .btn{flex:1;text-align:center}
  /* 打印前排版预览：全屏纸张流，卡片缩放手柄热区加大 */
  .lyt-ov{padding:0}
  .lyt-box{width:100vw;max-height:100vh;height:100%;border-radius:0}
  .lyt-body{padding:10px 6px 18px}
  .lyt-sheet{max-width:none}
  .lyt-card{padding:0 3px 8px}
  .lyt-card-head{left:6px;top:6px}
  .lyt-handle{width:36px;height:36px}
  .lyt-handle::after{right:8px;bottom:8px;width:15px;height:15px;border-width:4px}
  .sp-stage{display:block;width:100%}
  .sp-img{width:100%}
  .sp-line{height:0}
  .sp-line::before{top:-16px;height:32px}
  .sp-line .sp-no,.sp-line .sp-x{font-size:12px;padding:2px 9px;height:24px;line-height:24px;top:-12px}
  .sp-line .sp-x{width:24px}

  /* 提示/按钮安全区 */
  .toast{bottom:calc(84px + env(safe-area-inset-bottom))}
  .side-tip{display:none}
}

/* ==================== 裁剪选区弹窗 ==================== */
.crop-ov{position:fixed;inset:0;z-index:10000;background:rgba(15,23,42,.72);display:flex;align-items:center;justify-content:center;padding:18px;outline:none}
.crop-box{background:#fff;border-radius:14px;max-width:94vw;max-height:92vh;display:flex;flex-direction:column;overflow:hidden}
.crop-h{padding:12px 16px;display:flex;align-items:baseline;gap:10px;border-bottom:1px solid var(--line)}
.crop-h b{font-size:15px}
.crop-h span{font-size:12.5px;color:var(--muted)}
.crop-stage{position:relative;margin:14px auto;overflow:hidden;cursor:crosshair;touch-action:none;user-select:none;background:#f1f5f9;line-height:0;max-width:92vw}
.crop-img{width:100%;height:100%;display:block;pointer-events:none}
.crop-sel{position:absolute;border:2px dashed #6366f1;background:rgba(99,102,241,.12);box-shadow:0 0 0 9999px rgba(15,23,42,.45);pointer-events:none}
.crop-f{display:flex;align-items:center;gap:8px;padding:10px 16px 14px;border-top:1px solid var(--line);background:#fff;flex-shrink:0;box-shadow:0 -2px 8px rgba(15,23,42,.05)}
.crop-spacer{flex:1}

/* ==================== 圈选手写区编辑器（打印去手写的手动补充） ==================== */
.mask-ov{align-items:center}
.mask-h{flex-wrap:wrap;gap:2px 10px}
.mask-hint{flex-basis:100%}
.mask-label{font-size:13.5px;color:#334155;padding:10px 16px 0;line-height:1.6}
.mask-progress{display:flex;gap:7px;align-items:center;padding:9px 16px 0}
.mask-progress .pg{width:9px;height:9px;border-radius:50%;background:#cbd5e1;cursor:pointer;transition:transform .15s}
.mask-progress .pg.on{background:#6366f1;transform:scale(1.3)}
.mask-progress .pg.done{background:#10b981}
.mask-progress .pg.seen{background:#a5b4fc}
.mask-stage{border-radius:10px;box-shadow:0 2px 10px rgba(15,23,42,.18);flex:0 0 auto;align-self:center;max-width:100%;overflow:auto}
.mask-body{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden;background:#f8fafc;align-items:center;padding:8px 0}
.mask-wrap{position:relative;display:block}
.mask-stage img{display:block;width:100%;height:100%;pointer-events:none}
.mask-zoom-bar{display:flex;align-items:center;gap:6px;padding:7px 16px;border-top:1px solid var(--line);background:#fafbff;font-size:13px}
.mask-zoom-bar #maskZoom{min-width:52px;text-align:center;font-weight:600;color:#475569;font-variant-numeric:tabular-nums}
.mask-zoom-bar button{min-width:30px;padding:3px 8px;font-size:13px}
.mask-ink{position:absolute;inset:0;pointer-events:none}
.mask-zoom-bar .mask-brush-label{font-size:12.5px;color:var(--muted)}
.mask-zoom-bar .mask-brush-btn.on{background:#fee2e2;border-color:#ef4444;color:#b91c1c;font-weight:600}
.mask-note{font-size:12.5px;color:var(--muted);padding:7px 16px 0;line-height:1.5;min-height:20px}
.mask-count{font-size:12px;color:var(--muted)}
.mask-f{flex-wrap:wrap}

/* ==================== 打印前排版预览（layoutui：拖排序 + 拖缩放-连续百分比） ==================== */
.lyt-ov{align-items:stretch}
.lyt-box{width:min(960px,96vw);max-height:94vh}
.lyt-h{flex-wrap:wrap;gap:2px 10px}
.lyt-h span{flex-basis:100%}
.lyt-body{flex:1;overflow:auto;-webkit-overflow-scrolling:touch;padding:14px 12px 22px;background:#e9eef6}
.lyt-tip{position:sticky;top:4px;z-index:5;text-align:center;font-size:12.5px;color:#fff;min-height:0;pointer-events:none;transition:opacity .18s;opacity:0;margin:0 auto 8px;background:#7c3aed;border-radius:14px;padding:3px 14px;width:fit-content;max-width:92%}
.lyt-tip.on{opacity:1}
/* flex 流式排布：卡宽为任意百分比（20~100，inline style），同行总宽≤100% 自动并排；
   间距用外层占位卡 padding 均摊（4px+4px/5px+5px），两端留半距 → 视觉与 grid 时代一致 */
.lyt-sheet{display:flex;flex-wrap:wrap;width:100%;max-width:880px;margin:0 auto;align-items:flex-start}
.lyt-card{
  flex:none;box-sizing:border-box;padding:0 5px 10px;cursor:grab;
  user-select:none;-webkit-user-select:none;touch-action:pan-y;
}
.lyt-vis{
  position:relative;background:#fff;border:1px solid #e2e8f0;border-radius:12px;
  box-shadow:0 1px 4px rgba(15,23,42,.09);overflow:hidden;
}
.lyt-card.drag{opacity:.62}
.lyt-card.drag .lyt-vis{box-shadow:0 14px 34px rgba(15,23,42,.3);transform:scale(1.015);cursor:grabbing;z-index:4}
.lyt-card.resizing .lyt-vis{outline:2px dashed #7c3aed;outline-offset:3px}
.lyt-card.notext .lyt-vis{background:#f6f8fb}
.lyt-card-head{position:absolute;left:8px;top:8px;z-index:2;display:flex;gap:5px;align-items:center;pointer-events:none;max-width:calc(100% - 16px)}
.lyt-no{background:#6366f1;color:#fff;font-size:12px;font-weight:700;border-radius:8px;padding:1px 8px;line-height:19px;flex:none}
.lyt-topic{background:rgba(255,255,255,.92);border:1px solid #e2e8f0;color:#475569;font-size:11px;border-radius:8px;padding:0 7px;line-height:18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lyt-card-body{padding:5px;background:#fff}
.lyt-card.notext .lyt-card-body{padding:12px 14px 16px}
.lyt-card-body.single{padding:3px}
.lyt-card-body:not(.single){display:grid;grid-template-columns:1fr 1fr;gap:3px}
.lyt-img{display:block;width:100%;height:auto;pointer-events:none}
.lyt-text{font-size:13px;color:#334155;line-height:1.6;text-align:justify;margin-top:24px}
.lyt-text.dim{color:#94a3b8;font-style:italic}
.lyt-handle{
  position:absolute;right:0;bottom:0;width:30px;height:30px;z-index:3;cursor:nwse-resize;touch-action:none;
  border-bottom-right-radius:11px;background:transparent;
}
.lyt-handle::after{content:'';position:absolute;right:6px;bottom:6px;width:13px;height:13px;border-right:3px solid #94a3b8;border-bottom:3px solid #94a3b8;border-bottom-right-radius:3px}
.lyt-handle:hover::after{border-color:#6366f1}
.lyt-f{flex-wrap:wrap}

/* ==================== 整卷分题编辑器 ==================== */
#paperSplit{margin-top:14px}
.sp-hint{font-size:13px;color:var(--muted);margin-bottom:8px;line-height:1.6}
.sp-stage{position:relative;display:inline-block;max-width:100%;overflow:hidden;touch-action:none;user-select:none;cursor:crosshair;border:1px solid var(--line);border-radius:10px;background:#f8fafc;line-height:0}
.sp-img{max-width:100%;display:block;pointer-events:none}
.sp-line{position:absolute;left:0;right:0;height:0;border-top:2px dashed #3b82f6;cursor:ns-resize;touch-action:none}
/* 扩宽可抓取热区（透明），视觉虚线仍为 2px，便于手指/鼠标命中拖动 */
.sp-line::before{content:'';position:absolute;left:0;right:0;top:-13px;height:26px;cursor:ns-resize;touch-action:none}
.sp-line .sp-no{position:absolute;left:6px;top:-9px;background:#3b82f6;color:#fff;font-size:11px;border-radius:9px;padding:0 7px;line-height:18px;z-index:1}
.sp-line .sp-x{position:absolute;right:6px;top:-9px;width:18px;height:18px;background:#ef4444;color:#fff;border-radius:50%;font-size:10px;line-height:18px;text-align:center;cursor:pointer;z-index:1}
.sp-spacer{flex:1}

/* ==================== 候选题卡片：本题截图 ==================== */
.pc-thumb{display:block;max-width:100%;max-height:280px;border:1px solid var(--line);border-radius:8px;margin-bottom:10px}

/* ==================== 云同步状态 ==================== */
.sync-status{font-size:13.5px;line-height:1.7;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:10px 14px}

/* ============ 三端精细加固 ============ */
/* iPad 竖屏 / 平板：分析表格可横向滚动，错题筛选两列对齐 */
@media (min-width:768px) and (max-width:1024px){
  #weakTable{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .wtable{min-width:560px}
  .donut-wrap{gap:14px}
  .actions .btn{min-width:120px}
}

/* 大触屏上可点区块略加高，避免误触 */
@media (hover:none) and (pointer:coarse){
  .tp-chip,.tf-item,.sg-chip{padding:9px 13px}
  .unit-chip,.reason-chip{padding:9px 13px}
}

/* 桌面端超大屏：内容区限宽居中，避免信息行过长难读 */
@media (min-width:1500px){
  .views{max-width:1500px;margin:0 auto;width:100%}
}