:root{
  --brand:#2563eb; --brand2:#7c3aed; --brand-dark:#1d4ed8;
  --ok:#16a34a; --ok-bg:#ecfdf5; --err:#dc2626; --err-bg:#fef2f2;
  --bg:#f4f6fb; --card:#fff; --text:#1f2937; --muted:#6b7280; --line:#e5e7eb;
  --warn:#f59e0b; --warn-bg:#fffbeb;
  --radius:14px; --shadow:0 2px 10px rgba(30,41,59,.06);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg); color:var(--text); font-size:15px; line-height:1.75;
  padding-bottom:env(safe-area-inset-bottom);
}
a{color:var(--brand);text-decoration:none}
button{font-family:inherit;font-size:inherit;cursor:pointer;border:none;background:none;color:inherit}
.hide{display:none !important}

/* ---------- 顶部 ---------- */
header{
  position:sticky;top:0;z-index:50;background:linear-gradient(120deg,var(--brand),var(--brand2));
  color:#fff;padding:12px 16px;box-shadow:0 2px 12px rgba(37,99,235,.25)
}
.hd-inner{max-width:1080px;margin:0 auto;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.logo{font-size:17px;font-weight:700;letter-spacing:.5px;display:flex;align-items:center;gap:8px}
.logo .badge{background:rgba(255,255,255,.22);border-radius:20px;padding:2px 10px;font-size:12px;font-weight:500}
.hd-nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.hd-nav button{color:rgba(255,255,255,.85);padding:6px 12px;border-radius:20px;font-size:14px;transition:.15s}
.hd-nav button:hover{background:rgba(255,255,255,.15);color:#fff}
.hd-nav button.active{background:#fff;color:var(--brand);font-weight:600}
.hd-stat{font-size:12px;opacity:.9;display:flex;gap:10px;align-items:center}

/* ---------- 布局 ---------- */
main{max-width:1080px;margin:0 auto;padding:18px 14px 40px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin-bottom:16px}
h1,h2,h3,h4{margin:0 0 10px;line-height:1.4}
h1{font-size:20px}
h2{font-size:17px}
h3{font-size:15px}
.sec-title{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.sec-title .bar{width:4px;height:17px;border-radius:3px;background:linear-gradient(var(--brand),var(--brand2))}
.muted{color:var(--muted);font-size:13px}
.grid{display:grid;gap:12px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:10px 18px;border-radius:10px;font-size:14px;font-weight:600;
  background:var(--brand);color:#fff;transition:.15s;border:1px solid transparent
}
.btn:hover{background:var(--brand-dark)}
.btn.alt{background:#fff;color:var(--brand);border-color:var(--brand)}
.btn.gray{background:#f1f5f9;color:#475569}
.btn.ok{background:var(--ok)}
.btn.sm{padding:6px 12px;font-size:13px;border-radius:8px}
.btn.block{display:flex;width:100%}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}

/* ---------- 首页 ---------- */
.hero{
  background:linear-gradient(135deg,#eef4ff,#f5f0ff);border:1px solid #e0e9ff;
  border-radius:var(--radius);padding:18px;margin-bottom:16px
}
.hero h1{font-size:20px;margin-bottom:6px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.chip{background:#fff;border:1px solid #dbe4f5;border-radius:20px;padding:4px 12px;font-size:12px;color:#44507a}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.stat{background:#fff;border-radius:10px;padding:10px;text-align:center;border:1px solid #eef1f7}
.stat .n{font-size:20px;font-weight:700;color:var(--brand);line-height:1.3}
.stat .t{font-size:11px;color:var(--muted)}

table{width:100%;border-collapse:collapse;font-size:13px}
th,td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left}
th{background:#f8fafc;font-weight:600;color:#475569}
td.score{color:var(--brand);font-weight:700;white-space:nowrap}

/* ---------- 考点卡片 ---------- */
.pt-card{
  background:#fff;border-radius:12px;border:1px solid var(--line);padding:14px;
  display:flex;flex-direction:column;gap:6px;transition:.15s;position:relative;overflow:hidden
}
.pt-card:hover{border-color:var(--brand);box-shadow:0 4px 14px rgba(37,99,235,.12);transform:translateY(-2px)}
.pt-card .top{display:flex;align-items:center;justify-content:space-between;gap:6px}
.pt-card .nm{font-weight:600;font-size:14px}
.pt-card .en{font-size:11px;color:var(--muted)}
.pt-card .meta{font-size:11px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap}
.pt-bar{height:5px;border-radius:3px;background:#eef1f7;overflow:hidden;margin-top:4px}
.pt-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));border-radius:3px;transition:width .4s}
.tag{display:inline-block;font-size:11px;padding:1px 8px;border-radius:20px;background:#eef2ff;color:#44507a;white-space:nowrap}
.tag.ok{background:var(--ok-bg);color:var(--ok)}
.tag.warn{background:var(--warn-bg);color:#b45309}
.tag.err{background:var(--err-bg);color:var(--err)}
.tag.done{background:linear-gradient(90deg,var(--brand),var(--brand2));color:#fff}
.stars{color:#f59e0b;font-size:11px;letter-spacing:-1px}

/* ---------- 训练页 ---------- */
.train-wrap{display:grid;grid-template-columns:230px 1fr;gap:16px;align-items:start}
.pt-list{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:10px;position:sticky;top:76px;max-height:calc(100vh - 100px);overflow:auto}
.pt-list .mod-title{font-size:12px;color:var(--muted);margin:10px 8px 6px;font-weight:600}
.pt-item{padding:7px 10px;border-radius:8px;font-size:13px;display:flex;align-items:center;gap:6px;transition:.12s}
.pt-item:hover{background:#f1f5f9}
.pt-item.active{background:#eef4ff;color:var(--brand);font-weight:600}
.pt-item .dot{width:6px;height:6px;border-radius:50%;background:#cbd5e1;flex:none}
.pt-item.done .dot{background:var(--ok)}

.qhead{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.qhead .idx{font-size:13px;color:var(--muted)}
.lvl{font-size:11px;padding:2px 9px;border-radius:20px;background:#eef2ff;color:#44507a}
.lvl.l2{background:#fff7ed;color:#c2410c}
.lvl.l3{background:#fef2f2;color:#b91c1c}
.qtext{font-size:16px;line-height:1.9;white-space:pre-wrap;word-break:break-word}
.qtext .en{font-weight:500}
.passage{
  background:#fbfcfe;border:1px solid var(--line);border-radius:10px;padding:12px 14px;
  font-size:14px;line-height:1.9;max-height:280px;overflow:auto;margin-bottom:14px;white-space:pre-wrap
}
.opts{display:grid;gap:10px;margin-top:14px}
.opt{
  display:flex;gap:10px;align-items:flex-start;background:#fbfcfe;border:1.5px solid var(--line);
  border-radius:10px;padding:11px 14px;font-size:15px;line-height:1.7;text-align:left;transition:.12s;width:100%
}
.opt:hover:not(:disabled){border-color:var(--brand);background:#f5f9ff}
.opt .k{
  flex:none;width:24px;height:24px;border-radius:50%;background:#fff;border:1.5px solid #cbd5e1;
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:#64748b;margin-top:1px
}
.opt.picked{border-color:var(--brand);background:#eef4ff}
.opt.right{border-color:var(--ok);background:var(--ok-bg)}
.opt.right .k{background:var(--ok);color:#fff;border-color:var(--ok)}
.opt.wrong{border-color:var(--err);background:var(--err-bg)}
.opt.wrong .k{background:var(--err);color:#fff;border-color:var(--err)}
.opt:disabled{cursor:default}

.fill-row{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}
.fill-row input{
  flex:1;min-width:200px;padding:11px 14px;border:1.5px solid var(--line);border-radius:10px;
  font-size:15px;font-family:inherit;outline:none;background:#fbfcfe
}
.fill-row input:focus{border-color:var(--brand)}
.res-banner{border-radius:10px;padding:10px 14px;font-size:14px;font-weight:600;margin-top:14px;display:flex;align-items:center;gap:8px}
.res-banner.ok{background:var(--ok-bg);color:var(--ok);border:1px solid #a7f3d0}
.res-banner.err{background:var(--err-bg);color:var(--err);border:1px solid #fecaca}

/* ---------- 解析面板 ---------- */
.analysis{margin-top:14px;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.an-box{padding:12px 14px;border-bottom:1px solid var(--line)}
.an-box:last-child{border-bottom:none}
.an-box .h{font-weight:700;font-size:13px;display:flex;align-items:center;gap:6px;margin-bottom:5px}
.an-box .c{font-size:14px;line-height:1.85;color:#374151;white-space:pre-wrap}
.an-how{background:#fffbeb}.an-how .h{color:#b45309}
.an-ex{background:#f8fafc}.an-ex .h{color:var(--brand)}
.an-base{background:#f5f3ff}.an-base .h{color:var(--brand2)}
.an-trap{background:#fef2f2}.an-trap .h{color:#b91c1c}
.an-ref{background:#ecfdf5}.an-ref .h{color:var(--ok)}
.an-pts{background:#eef2ff}.an-pts .h{color:#4338ca}

/* ---------- 总结 ---------- */
.sum-hero{text-align:center;padding:22px 16px;background:linear-gradient(135deg,#eef4ff,#f5f0ff);border-radius:var(--radius);margin-bottom:16px}
.sum-hero .big{font-size:40px;font-weight:800;color:var(--brand);line-height:1.2}
.sum-hero .big.good{color:var(--ok)}.sum-hero .big.mid{color:var(--warn)}.sum-hero .big.bad{color:var(--err)}
.sum-hero .cmt{font-size:14px;color:#475569;margin-top:4px}
.sum-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:14px}
.sum-grid .s{background:#fff;border-radius:10px;padding:10px;text-align:center;border:1px solid #eef1f7}
.sum-grid .s .n{font-size:19px;font-weight:700}
.sum-grid .s .t{font-size:11px;color:var(--muted)}
.kf-item{background:#f8fafc;border-left:3px solid var(--brand);border-radius:0 8px 8px 0;padding:8px 12px;margin-bottom:7px;font-size:13.5px;line-height:1.8}
.wrong-item{border:1px solid #fecaca;background:var(--err-bg);border-radius:10px;padding:10px 12px;margin-bottom:8px;font-size:13.5px}
.wrong-item .qs{font-weight:600;margin-bottom:3px}

/* ---------- 路线图 ---------- */
.road{position:relative;padding-left:24px}
.road::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--brand),var(--brand2))}
.road-item{position:relative;margin-bottom:16px}
.road-item::before{content:"";position:absolute;left:-22px;top:6px;width:12px;height:12px;border-radius:50%;background:#fff;border:3px solid var(--brand)}
.road-item .st{font-weight:700;font-size:15px;color:var(--brand)}
.road-item .tg{font-size:12px;color:var(--muted);margin-bottom:4px}
.road-item .ds{font-size:13.5px;line-height:1.8}
.road-item .its{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}

/* ---------- 错题本 ---------- */
.wb-item{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-bottom:10px}
.wb-item .q{font-size:14.5px;line-height:1.8;margin-bottom:6px}
.wb-item .a{font-size:13px;color:var(--muted)}
.empty{text-align:center;padding:40px 16px;color:var(--muted)}
.empty .ico{font-size:40px;margin-bottom:8px}

/* ---------- 浮动提示 ---------- */
.toast{
  position:fixed;left:50%;bottom:80px;transform:translateX(-50%);
  background:rgba(17,24,39,.92);color:#fff;padding:10px 18px;border-radius:24px;
  font-size:13.5px;z-index:200;opacity:0;transition:.25s;pointer-events:none;max-width:90vw;text-align:center
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(-6px)}

/* ---------- 底部导航（移动端） ---------- */
.tabbar{
  display:none;position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);
  z-index:60;padding:6px 0 env(safe-area-inset-bottom)
}
.tabbar .t{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;font-size:11px;color:var(--muted);padding:4px}
.tabbar .t.active{color:var(--brand);font-weight:600}
.tabbar .t .ic{font-size:18px;line-height:1}

@media (max-width:860px){
  .train-wrap{grid-template-columns:1fr}
  .pt-list{position:static;max-height:none;display:flex;gap:6px;overflow-x:auto;padding:8px}
  .pt-list .mod-title{display:none}
  .pt-item{white-space:nowrap;border:1px solid var(--line)}
  .g4,.g3,.g2{grid-template-columns:repeat(2,1fr)}
  .stat-row,.sum-grid{grid-template-columns:repeat(2,1fr)}
  .hd-nav{display:none}
  .tabbar{display:flex}
  main{padding-bottom:70px}
  .hero h1{font-size:18px}
  .qtext{font-size:15px}
}
@media (max-width:420px){
  .g4,.g3,.g2{grid-template-columns:1fr}
}

/* ===== 核心词汇表 ===== */
.wb-group{border:1px solid var(--line);border-radius:10px;margin-bottom:10px;overflow:hidden}
.wb-head{padding:10px 14px;background:#f8fafc;font-weight:600;font-size:14px;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.wb-head:hover{background:#f1f5f9}
.wb-body{padding:12px 14px}
.wb-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:6px 18px}
.wbl-item{display:flex;justify-content:space-between;gap:10px;padding:4px 0;border-bottom:1px dashed var(--line);font-size:14px}
.wbl-item .en{color:#1d4ed8;font-weight:600}
.wbl-item .zh{color:var(--muted);font-size:13px;text-align:right}
@media (max-width:860px){.wb-grid{grid-template-columns:1fr}}

/* ===== 模拟卷计时 ===== */
.mock-clock{background:#fef3c7;color:#b45309;font-weight:600}

/* ===== tabbar 六项适配 ===== */
@media (max-width:420px){
  .tabbar .t{font-size:10px}
  .tabbar .t .ic{font-size:16px}
}

/* ===== 错题归因 ===== */
.cause-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.cause-chip{background:#eef2ff;color:#4338ca;border-radius:20px;padding:4px 12px;font-size:13px}
.cause-chip b{color:#1d4ed8}
.cause-line{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:8px 0}
.cause-btn{background:#f8fafc;border:1px solid var(--line);border-radius:16px;padding:3px 11px;font-size:12.5px;cursor:pointer;color:var(--muted);font-family:inherit}
.cause-btn:hover{background:#eef2ff}
.cause-btn.on{background:#4338ca;color:#fff;border-color:#4338ca}

/* ===== 多科目平台：科目切换器 ===== */
.subj-sel{
  padding:8px 12px;border-radius:10px;border:1px solid var(--line);
  background:var(--card);color:var(--text);font-size:14px;font-weight:600;
  cursor:pointer;margin-left:12px;outline:none;
}
.subj-sel:hover{border-color:var(--brand)}
@media (max-width:640px){
  .subj-sel{margin-left:0;margin-right:8px;font-size:13px;padding:6px 8px;max-width:96px}
}

/* ===== 多选：已选项高亮 ===== */
.opt.picked{border-color:var(--brand);background:var(--brand-soft,rgba(47,111,237,.10));font-weight:600}

/* ===== 图形题容器 ===== */
.figbox{margin:10px 0;padding:8px;background:var(--card);border:1px solid var(--line);border-radius:10px;overflow-x:auto}
.figbox svg{display:block;max-width:100%;height:auto}
.search-label{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:12px 0}
.search-label input,.answer-draft{font:inherit;padding:10px;border:1px solid var(--line);border-radius:8px;max-width:100%}
.answer-draft{display:block;width:100%;min-height:150px;margin-top:12px}
.answer-grid{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0}
.answer-grid button{border:1px solid var(--line);padding:5px 10px;border-radius:6px}
.answer-grid .answered{background:var(--ok-bg);border-color:var(--ok)}
.answer-grid .current{outline:2px solid var(--brand)}
.reference-options{border:1px solid var(--line);border-radius:8px;padding:12px;margin:12px 0;font-size:13px}
button:focus-visible,input:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--brand);outline-offset:3px}
.score-input{font:inherit;width:90px;padding:5px;border:1px solid var(--line);border-radius:6px}
.exam-table-wrap{overflow-x:auto}
.confirm-dialog{border:1px solid var(--line);border-radius:14px;padding:22px;max-width:min(420px,90vw);color:var(--text);box-shadow:0 8px 40px #0003}
.confirm-dialog::backdrop{background:#0006}