/* 小学学习助手 · 样式 —— 暖纸文具风
 * 主色：墨青绿（作业本封皮）；点缀：荧光橙；底：米白纸纹
 */
:root{
  --bg:#f6f3ec; --card:#fff;
  --ink:#2c2a24; --muted:#8b8577;
  --line:#e7e1d3; --line-strong:#d9d1bf;
  --primary:#0e7a6c; --primary-deep:#0a5f54; --primary-soft:#e3f2ee;
  --accent:#e8890c; --accent-soft:#fdf3e3;
  --green:#1a9a5c; --green-soft:#e9f6ee;
  --red:#d64541; --red-soft:#fceeee;
  --radius:16px;
  --shadow:0 1px 2px rgba(60,50,30,.04),0 5px 16px rgba(60,50,30,.06);
  --shadow-up:0 2px 4px rgba(60,50,30,.06),0 10px 24px rgba(60,50,30,.09);
  --num-font:Georgia,"Times New Roman",serif;
  /* 顶栏高度：手机端在媒体查询里改小，layout/sidenav 的高度计算同步跟随 */
  --topbar-h:66px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  /* 顶部安全区由 .topbar 的内 padding 负责（背景垫进状态栏区域，滚动内容不再穿出）；
     底部安全区留给 home indicator */
  padding-bottom:env(safe-area-inset-bottom);
  background:var(--bg);
  background-image:radial-gradient(rgba(96,84,58,.055) 1px,transparent 1px);
  background-size:20px 20px;
  color:var(--ink);
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:15px;line-height:1.65;
}
h1,h2,h3{margin:0}
::selection{background:var(--primary-soft);color:var(--primary-deep)}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#d8d1c0;border-radius:6px;border:2px solid var(--bg)}
::-webkit-scrollbar-track{background:transparent}
.muted{color:var(--muted);font-size:13px;font-weight:400}
.ic{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* ---------- 顶栏 ---------- */
.topbar{
  /* 从视口顶部贴起，用内 padding 撑出状态栏安全区：毛玻璃背景覆盖状态栏，滚动内容被完整遮住。
     用 min-height 而非 height：极端情况下内容超高会把顶栏撑开，而不是被裁掉 */
  min-height:calc(var(--topbar-h) + env(safe-area-inset-top));padding-top:env(safe-area-inset-top);
  background:rgba(255,255,255,.82);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;padding-left:22px;padding-right:22px;
  position:sticky;top:0;z-index:20;overflow:hidden;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-seal{
  width:38px;height:38px;border-radius:11px;flex:none;
  background:linear-gradient(145deg,#12897a,#0a5f54);
  color:#fdf9ee;display:flex;align-items:center;justify-content:center;
  font-size:21px;font-weight:700;font-family:"Kaiti SC","STKaiti",KaiTi,serif;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.25),0 3px 8px rgba(10,95,84,.28);
  letter-spacing:0;
}
.brand h1{font-size:18px;font-weight:800;letter-spacing:.5px;white-space:nowrap}
.brand .sub{display:block;font-size:12px;color:var(--muted);margin-top:-2px;letter-spacing:.2px;white-space:nowrap}
.top-stats{display:flex;gap:30px;flex:none}
.top-stats .stat{text-align:center;line-height:1.2}
.top-stats b{
  display:block;font-size:21px;color:var(--primary-deep);
  font-family:var(--num-font);font-weight:700;font-variant-numeric:tabular-nums;
}
.top-stats span{font-size:11.5px;color:var(--muted);letter-spacing:.5px}

/* ---------- 布局 ---------- */
.layout{display:flex;min-height:calc(100vh - var(--topbar-h) - env(safe-area-inset-top))}
.sidenav{
  width:198px;flex:none;background:rgba(255,255,255,.65);backdrop-filter:blur(6px);
  border-right:1px solid var(--line);
  padding:18px 12px 14px;display:flex;flex-direction:column;gap:3px;
  position:sticky;top:calc(var(--topbar-h) + env(safe-area-inset-top));height:calc(100vh - var(--topbar-h) - env(safe-area-inset-top));
}
.nav-title{font-size:11px;color:var(--muted);letter-spacing:2px;padding:8px 12px 4px;font-weight:600}
.nav-title:first-child{padding-top:0}
.nav-item{
  position:relative;display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:11px;
  color:var(--ink);text-decoration:none;font-size:14.5px;cursor:pointer;transition:background .15s,color .15s;
}
.nav-item:hover{background:rgba(14,122,108,.07)}
.nav-item.active{background:var(--primary-soft);color:var(--primary-deep);font-weight:600}
.nav-item.active::before{
  content:'';position:absolute;left:-12px;top:9px;bottom:9px;width:3.5px;
  border-radius:0 4px 4px 0;background:var(--primary);
}
.nav-item .ic{width:19px;height:19px}
.nav-badge{
  margin-left:auto;background:var(--red);color:#fff;font-size:11px;font-style:normal;
  min-width:19px;height:19px;border-radius:10px;display:none;align-items:center;justify-content:center;padding:0 5px;
  font-family:var(--num-font)
}
.nav-badge.show{display:flex}
.nav-foot{margin-top:auto;display:flex;flex-direction:column;gap:6px;padding-top:14px;border-top:1px dashed var(--line-strong)}
.content{flex:1;padding:24px;min-width:0}
/* 内容限宽居中：放在 .view 上（block width:auto 不受内容 min-content 撑破，竖屏/桌面通吃） */
.view.active{width:100%;max-width:832px;margin:0 auto}
.view{display:none}
.view.active{display:block;animation:viewIn .25s ease}
@keyframes viewIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- 卡片 ---------- */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 22px;margin-bottom:20px;box-shadow:var(--shadow)
}
.card-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.card-head h2{font-size:16.5px;font-weight:700;letter-spacing:.3px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:900px){.grid-2{grid-template-columns:1fr}.layout{flex-direction:column}.sidenav{width:100%;height:auto;position:static;flex-direction:row;overflow-x:auto;padding:10px 12px;flex-wrap:nowrap;-webkit-overflow-scrolling:touch;scrollbar-width:none}.sidenav::-webkit-scrollbar{display:none}.nav-item{flex:0 0 auto;white-space:nowrap}.nav-title,.nav-foot{display:none}}

/* ---------- 手机端适配 ---------- */
@media(max-width:640px){
  :root{--topbar-h:56px}
  .content{padding:14px 12px}
  .card{padding:16px 14px}
  /* 顶栏瘦身：窄屏塞不下“品牌 + 副标题 + 三组统计”，去掉副标题并整体缩小，
     避免横向挤压后文字换行、被固定高度裁掉 */
  .topbar{padding-left:12px;padding-right:12px;gap:10px}
  .brand{gap:9px}
  .brand-seal{width:30px;height:30px;border-radius:9px;font-size:17px}
  .brand h1{font-size:15.5px}
  .brand .sub{display:none}
  .top-stats{gap:15px}
  .top-stats b{font-size:16px}
  .top-stats span{font-size:10px;letter-spacing:0}
  /* 导航：7 个项目若强制均分，每项只剩 60px 会把“打印练习卷”挤变形；
     改为保持自然宽度 + 横向滚动，字号略收，文字不再被压扁 */
  .sidenav{gap:6px;padding:8px 10px;flex-wrap:nowrap}
  .nav-item{flex:0 0 auto;justify-content:center;white-space:nowrap;gap:5px;padding:7px 12px;font-size:12.5px;min-width:0}
  .nav-item .ic{width:16px;height:16px;flex:none}
  .nav-item .nav-badge{margin-left:3px}
  .nav-item.active::before{display:none}
  .row{flex-direction:column;gap:0;align-items:stretch}
  .row.wrap{align-items:stretch}
  .row .field{width:100%;flex:none}
  .field.grow{display:none}
  .segment{width:100%;flex-wrap:nowrap}
  .segment .seg{flex:1 1 0;min-width:0;text-align:center;padding:7px 4px;white-space:nowrap}
  .row .segment.sm .seg{padding:6px 4px;font-size:12.5px}
  /* 粤语分组有 20+ 个，均分会把每项压成一条竖线；改自然宽度 + 横向滚动（隐藏滚动条） */
  #yueGroupSeg{overflow-x:auto;justify-content:flex-start;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  #yueGroupSeg::-webkit-scrollbar{display:none}
  #yueGroupSeg .seg{flex:0 0 auto;padding:7px 13px}
}

.field{margin-bottom:15px}
.field>label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:8px;font-weight:600;letter-spacing:.5px}
.row{display:flex;gap:18px}
.row.wrap{flex-wrap:wrap;align-items:flex-end}
.row .field{flex:1}
.field.grow{flex:1}
.btn-row{display:flex;gap:8px;flex-wrap:wrap}
/* iPad 适配：打印设置行字段不被挤成竖条（最小宽度触发 wrap），checkbox 文字永不竖排 */
#view-print .row .field{min-width:150px}
#view-print .row .field.grow{display:none}
#view-print .row .field:last-child{margin-left:auto}
.cb{white-space:nowrap}
/* iPad 竖屏（≤900 顶栏布局）：打印设置行改两列网格，字段随轨道收缩，彻底消除横向溢出 */
@media (max-width:900px){
  #view-print .row.wrap{display:grid;grid-template-columns:1fr 1fr;gap:10px 18px;align-items:end}
  #view-print .row .field{min-width:0;margin-bottom:4px}
  #view-print .row .field.grow{display:none}
  #view-print .row .field:last-child{grid-column:1 / -1;margin-left:0}
}

/* 分段控件 */
.segment{display:inline-flex;background:rgba(231,225,211,.55);border:1px solid var(--line);border-radius:11px;padding:3px;gap:2px;flex-wrap:wrap}
.seg{border:0;background:transparent;padding:7px 16px;border-radius:8px;font-size:14px;color:var(--ink);cursor:pointer;transition:.15s;font-family:inherit}
.seg:hover{color:var(--primary-deep)}
.seg.active{
  background:var(--primary);color:#fff;font-weight:600;
  box-shadow:0 2px 6px rgba(14,122,108,.28)
}
.segment.sm .seg{padding:5px 12px;font-size:13px}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  border:1px solid var(--line-strong);background:#fff;border-radius:20px;padding:6px 14px;font-size:13px;
  cursor:pointer;transition:.15s;user-select:none;color:#4a463c
}
.chip:hover{border-color:var(--primary);color:var(--primary-deep);transform:translateY(-1px)}
.chip.on{background:var(--primary-soft);border-color:var(--primary);color:var(--primary-deep);font-weight:600}
.link-btn{background:none;border:0;color:var(--primary);font-size:12px;cursor:pointer;padding:0 6px;font-family:inherit}
.link-btn:hover{color:var(--primary-deep)}

/* 按钮 */
.btn-primary{
  background:var(--primary);color:#fff;border:0;border-radius:11px;padding:10px 24px;font-size:15px;
  font-weight:600;cursor:pointer;transition:.15s;font-family:inherit;letter-spacing:.5px;
  box-shadow:0 3px 8px rgba(14,122,108,.22)
}
.btn-primary:hover{background:var(--primary-deep);transform:translateY(-1px);box-shadow:0 6px 14px rgba(14,122,108,.28)}
.btn-primary:active{transform:translateY(0)}
.btn-primary:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.btn-ghost{
  background:#fff;color:var(--ink);border:1px solid var(--line-strong);border-radius:11px;padding:9px 16px;
  font-size:14px;cursor:pointer;transition:.15s;font-family:inherit
}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary-deep);transform:translateY(-1px)}
.btn-ghost.sm{padding:6px 12px;font-size:13px;border-radius:9px}
.text-input{
  border:1px solid var(--line-strong);border-radius:10px;padding:9px 12px;font-size:14px;width:100%;
  font-family:inherit;background:#fff;color:var(--ink);transition:.15s
}
.text-input:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px rgba(14,122,108,.12)}
.checks{display:flex;gap:14px;align-items:center;height:38px;flex-wrap:wrap;height:auto;min-height:38px}
.cb{display:flex;align-items:center;gap:6px;font-size:13.5px;cursor:pointer}
.cb input{accent-color:var(--primary)}

/* ---------- 练习 ---------- */
.quiz-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:16px}
.quiz-progress{display:flex;align-items:center;gap:10px;flex:1;min-width:180px;max-width:340px}
.bar{flex:1;height:8px;background:rgba(231,225,211,.8);border-radius:5px;overflow:hidden}
.bar i{display:block;height:100%;border-radius:5px;transition:.3s;
  background:linear-gradient(90deg,#12897a,#0e7a6c)}
#quizProgressText{font-size:13px;color:var(--muted);white-space:nowrap;font-family:var(--num-font)}
.quiz-list{display:flex;flex-direction:column;gap:13px}
.q-item{border:1px solid var(--line);border-left:3.5px solid transparent;border-radius:13px;padding:15px 17px;background:#fff;transition:border-color .2s}
.q-item.right{border-color:#cdeadb;border-left-color:var(--green);background:var(--green-soft)}
.q-item.wrong{border-color:#f3d6d4;border-left-color:var(--red);background:var(--red-soft)}
.q-top{display:flex;gap:11px;align-items:flex-start}
.q-no{
  flex:none;width:27px;height:27px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);
  display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:700;font-family:var(--num-font)
}
.q-body{flex:1;min-width:0}
.q-stem{font-size:16px;line-height:1.75;margin-bottom:8px}
.q-kp{display:inline-block;font-size:11.5px;color:var(--muted);background:rgba(231,225,211,.55);border-radius:5px;padding:1px 8px;margin-left:8px;vertical-align:2px}
/* 剪拼问题配图 */
.cutwrap{margin:10px 0 4px;text-align:center;overflow-x:auto}
.cutwrap .cutgrid{display:inline-block;max-width:100%;height:auto;vertical-align:middle}
.cutpair{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:center}
.cutpair .cutplus{font-size:20px;font-weight:700;color:#d9534f;line-height:1}
/* 题目出处：题卡顶部独立一行，墨绿浅底保证显眼 */
.q-src{
  display:flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--primary);
  background:rgba(14,122,108,.08);border-radius:6px;padding:3px 9px;margin-bottom:7px;line-height:1.5
}
.q-src .speak-btn{width:22px;height:22px;font-size:11px;line-height:22px;margin-left:auto;margin-right:0;flex:none}
.q-answer{margin-top:9px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.q-answer input{
  border:1px solid var(--line-strong);border-radius:9px;padding:8px 12px;font-size:15px;width:170px;font-family:inherit;
  transition:.15s;background:#fff;color:var(--ink)
}
.q-answer input:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px rgba(14,122,108,.12)}
.q-item.right .q-answer input{background:#fff;border-color:#bfe0cf}
.q-item.wrong .q-answer input{background:#fff;border-color:#eec3c1}
.q-opts{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.opt{
  border:1px solid var(--line-strong);background:#fff;border-radius:9px;padding:7px 15px;font-size:14.5px;cursor:pointer;transition:.15s;color:var(--ink)
}
.opt:hover{border-color:var(--primary);color:var(--primary-deep)}
.opt.on{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}
.opt.right-flag{background:var(--green);border-color:var(--green);color:#fff}
.opt.wrong-flag{background:var(--red);border-color:var(--red);color:#fff}
.speak-btn{
  width:26px;height:26px;border-radius:50%;border:none;background:rgba(14,122,108,.1);
  cursor:pointer;font-size:13px;line-height:26px;padding:0;margin-left:6px;
  vertical-align:middle;display:inline-flex;align-items:center;justify-content:center;
  transition:background .15s,transform .1s
}
.speak-btn:hover{background:rgba(14,122,108,.22)}
.speak-btn:active{transform:scale(.9)}
/* 云端同步卡片 */
.cloud-input{
  width:100%;box-sizing:border-box;border:1px solid var(--line-strong);border-radius:9px;
  padding:8px 10px;font-size:14px;color:var(--ink);background:#fff;resize:vertical;
  word-break:break-all;font-family:inherit
}
.cloud-input:focus{outline:none;border-color:var(--primary)}
.cloud-hint{font-size:12.5px;margin:8px 0 0;line-height:1.5}
.cloud-divider{height:1px;background:var(--line);margin:14px 0}
.q-feedback{margin-top:10px;font-size:14px;display:flex;gap:10px;align-items:flex-start;flex-wrap:wrap}
.q-feedback .mark{font-weight:700}
.q-item.right .q-feedback .mark{color:var(--green)}
.q-item.wrong .q-feedback .mark{color:var(--red)}
.q-explain{
  margin-top:8px;background:rgba(255,255,255,.85);border-left:3px solid var(--accent);border-radius:7px;padding:8px 12px;
  font-size:13.5px;color:#5a5344;width:100%
}
.q-hint{font-size:12.5px;color:var(--accent)}
.quiz-foot{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap}
.result{
  margin-top:18px;border-radius:14px;padding:18px 20px;
  background:linear-gradient(150deg,#eafaf3,var(--primary-soft));
  border:1px solid #cfe9df
}
.result h3{font-size:17px;margin-bottom:8px}
.result .score{font-size:32px;font-weight:700;color:var(--primary-deep);margin-right:6px;font-family:var(--num-font)}
.result .r-line{margin:4px 0;font-size:14px}
.result .r-actions{margin-top:12px;display:flex;gap:10px;flex-wrap:wrap}

/* ---------- 错题本 ---------- */
.stat-row{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.stat-box{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:10px 16px;min-width:98px}
.stat-box b{display:block;font-size:20px;color:var(--primary-deep);font-family:var(--num-font);font-weight:700}
.stat-box span{font-size:12px;color:var(--muted)}
.kp-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:13px}
.kp-tag{background:var(--accent-soft);border:1px solid #f2dfba;color:#9a6410;border-radius:20px;padding:4px 12px;font-size:12.5px}
.wrong-list{display:flex;flex-direction:column;gap:11px}
.w-item{border:1px solid var(--line);border-radius:13px;padding:13px 15px;display:flex;gap:12px;align-items:flex-start;background:#fff}
.w-item.mastered{opacity:.55}
.w-main{flex:1;min-width:0}
.w-stem{font-size:15px;margin-bottom:4px;word-break:break-word}
.w-meta{font-size:12.5px;color:var(--muted);display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.w-meta .badge{padding:1px 9px;border-radius:6px;background:var(--bg);border:1px solid var(--line)}
.w-meta .badge.red{background:var(--red-soft);color:var(--red);border-color:#f0cbc9}
.w-meta .badge.green{background:var(--green-soft);color:var(--green);border-color:#cdeadb}
.w-explain{font-size:13px;color:#5a5344;margin-top:7px;background:var(--bg);border-radius:8px;padding:8px 11px}
.w-actions{display:flex;flex-direction:column;gap:6px}

/* ---------- 计划 ---------- */
.task-list{list-style:none;margin:0 0 15px;padding:0;display:flex;flex-direction:column;gap:8px}
.task-item{
  display:flex;align-items:center;gap:11px;padding:11px 13px;border:1px solid var(--line);
  border-radius:12px;cursor:pointer;transition:.15s;background:#fff
}
.task-item:hover{border-color:var(--primary);transform:translateY(-1px);box-shadow:var(--shadow)}
.task-item.done{background:var(--green-soft);border-color:#cdeadb}
.task-item.done .t-name{text-decoration:line-through;color:var(--muted)}
.t-box{
  width:20px;height:20px;border:2px solid var(--line-strong);border-radius:6px;flex:none;
  display:flex;align-items:center;justify-content:center;transition:.15s;background:#fff
}
.task-item.done .t-box{background:var(--green);border-color:var(--green)}
.t-box svg{width:13px;height:13px;stroke:#fff;stroke-width:3;fill:none;display:none}
.task-item.done .t-box svg{display:block}
.t-name{flex:1;font-size:14.5px}
.t-min{font-size:12px;color:var(--muted)}
.t-del{border:0;background:none;color:var(--muted);cursor:pointer;font-size:16px;padding:0 4px;border-radius:5px}
.t-del:hover{color:var(--red)}
.add-task{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.add-task input{flex:1;min-width:120px;height:40px;padding-top:0;padding-bottom:0}
.add-task .btn-add-task{
  flex-shrink:0;white-space:nowrap;border:0;border-radius:10px;background:var(--primary);color:#fff;
  padding:10px 18px;font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;transition:.15s;
  box-shadow:0 2px 6px rgba(14,122,108,.22)
}
.add-task .btn-add-task:hover{background:var(--primary-deep);transform:translateY(-1px)}
.add-task .btn-add-task:active{transform:translateY(0)}
.add-task .link-btn{flex-shrink:0;white-space:nowrap;font-size:13px}

/* ---------- 我的题目 ---------- */
.btn-primary.sm{padding:8px 16px;font-size:13.5px;border-radius:9px}
.mine-opts{display:flex;flex-direction:column;gap:8px}
.mine-opt-row{display:flex;align-items:center;gap:8px}
.mine-opt-row i{font-style:normal;color:var(--muted);font-size:13px;width:14px;text-align:center}
.mine-opt-row .mine-answer{accent-color:var(--primary);width:16px;height:16px;flex-shrink:0}
.mine-opt-row .text-input{flex:1;width:auto;min-width:0}
.mine-row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:640px){.mine-row2{grid-template-columns:1fr}}
.mine-list{display:flex;flex-direction:column;gap:10px}
.mine-item{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.mine-ans{font-size:12.5px;color:var(--muted)}
.mine-ans b{color:var(--ink)}

/* 粤语跟读 */
.yue-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:10px}
.yue-card{
  background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:14px 16px;
  display:flex;flex-direction:column;gap:3px;transition:.15s
}
.yue-card:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.yue-card.done{background:var(--green-soft);border-color:var(--green)}
.yue-word{font-size:26px;font-weight:700;color:var(--ink);letter-spacing:2px;line-height:1.2}
.yue-jp{font-size:13px;color:var(--primary-deep);letter-spacing:.5px;font-style:italic}
.yue-card.done .yue-jp{color:var(--green)}
.yue-mand{font-size:12.5px;color:var(--muted)}
.yue-actions{display:flex;align-items:center;gap:8px;margin-top:9px}
.yue-speak{
  width:38px;height:38px;border-radius:50%;border:1px solid var(--line-strong);background:#fff;
  font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.15s;flex-shrink:0
}
.yue-speak:hover{border-color:var(--primary);background:var(--primary-soft);transform:scale(1.06)}
.yue-speak:active{transform:scale(.94)}
.yue-done-btn{
  border:0;background:var(--line);color:var(--muted);font-size:12.5px;padding:7px 12px;
  border-radius:999px;cursor:pointer;font-family:inherit;transition:.15s
}
.yue-done-btn:hover{background:var(--line-strong)}
.yue-done-btn.on{background:var(--green);color:#fff}

/* 英语句子跟读 */
.eng-list{display:flex;flex-direction:column;gap:10px}
.eng-card{
  background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:13px 16px;
  display:flex;flex-direction:column;gap:5px;transition:.15s
}
.eng-card:hover{border-color:var(--primary)}
.eng-card.ok{background:var(--green-soft);border-color:var(--green)}
.eng-sent{font-size:19px;font-weight:700;color:var(--ink);line-height:1.35;letter-spacing:.2px}
.eng-sent span.hit{color:var(--green)}
.eng-sent span.half{color:var(--accent)}
.eng-sent span.miss{color:var(--red);text-decoration:underline wavy rgba(214,69,65,.5)}
.eng-zh{font-size:12.5px;color:var(--muted)}
.eng-actions{display:flex;align-items:center;gap:8px;margin-top:6px;flex-wrap:wrap}
.eng-mic{
  border:1px solid var(--line-strong);background:#fff;color:var(--ink);font-size:13px;padding:8px 14px;
  border-radius:999px;cursor:pointer;font-family:inherit;transition:.15s
}
.eng-mic:hover{border-color:var(--primary);background:var(--primary-soft)}
.eng-mic.rec{background:var(--red);border-color:var(--red);color:#fff;animation:engPulse 1.2s infinite}
@keyframes engPulse{0%,100%{box-shadow:0 0 0 0 rgba(214,69,65,.35)}50%{box-shadow:0 0 0 6px rgba(214,69,65,0)}}
.eng-best{font-size:12px;color:var(--primary-deep);font-weight:600}
.eng-score{margin-top:8px;padding:10px 12px;background:#fff;border:1px dashed var(--line-strong);border-radius:10px}
.eng-score-line{font-size:14px;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.eng-score-num{font-size:22px;color:var(--primary-deep);font-family:var(--num-font)}
.eng-heard{font-size:12px;color:var(--muted);margin-top:4px;word-break:break-all}
.eng-wait{font-size:13px;color:var(--muted)}
.eng-self-actions{display:flex;gap:8px;flex-wrap:wrap}
.calendar{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-bottom:16px}
.cal-head{text-align:center;font-size:12px;color:var(--muted);padding:2px 0;font-weight:600;letter-spacing:1px}
.cal-cell{
  aspect-ratio:1;border-radius:10px;border:1px solid var(--line);display:flex;flex-direction:column;
  align-items:center;justify-content:center;font-size:13px;background:#fff;position:relative;transition:.15s
}
.cal-cell:hover{border-color:var(--primary)}
.cal-cell.empty{border:0;background:transparent}
.cal-cell.today{border:1.5px dashed var(--primary)}
.cal-cell.on{background:var(--primary-soft);border-color:#bfe0d8}
.cal-cell.on::after{content:'';width:5px;height:5px;border-radius:50%;background:var(--primary);position:absolute;bottom:5px}
.cal-cell .cn{font-size:10px;color:var(--primary-deep);margin-top:1px;font-family:var(--num-font)}
.history-list{display:flex;flex-direction:column;gap:7px}
.h-item{display:flex;gap:14px;align-items:center;font-size:13.5px;padding:8px 13px;background:var(--bg);border:1px solid var(--line);border-radius:10px;flex-wrap:wrap}
.h-item .h-date{color:var(--muted);flex:none;font-family:var(--num-font)}
.h-item .h-sub{font-weight:600;color:var(--primary-deep)}
.h-empty{color:var(--muted);font-size:13.5px}

/* ---------- 空状态 ---------- */
.empty-illo{text-align:center;padding:28px 0 12px;color:var(--muted);font-size:13.5px}
.empty-illo svg{width:86px;height:86px;stroke:#cfc7b2;fill:none;stroke-width:1.3;stroke-linecap:round;stroke-linejoin:round;margin-bottom:6px}

/* ---------- 打印卷 ---------- */
.paper-wrap{display:flex;justify-content:center;overflow-x:auto;padding-bottom:20px}
.paper{
  width:210mm;max-width:100%;min-height:297mm;background:#fff;padding:16mm 14mm;
  box-shadow:0 1px 3px rgba(60,50,30,.1),0 14px 34px rgba(60,50,30,.12);
  border-radius:3px;color:#111;font-size:12.5pt;line-height:1.9
}
.paper h1{font-size:17pt;text-align:center;margin:0 0 4mm;letter-spacing:2px}
.paper .p-meta{display:flex;justify-content:space-between;font-size:10.5pt;color:#444;border-bottom:1.5px solid #333;padding-bottom:2mm;margin-bottom:5mm}
.paper .p-sec{font-weight:700;margin:4mm 0 2mm;font-size:12.5pt}
.paper ol{margin:0;padding-left:6mm;columns:2;column-gap:8mm}
.paper li{margin-bottom:2.6mm;break-inside:avoid;line-height:1.8}
.paper .p-ans{page-break-before:always;margin-top:8mm}
.paper .p-ans h2{font-size:14pt;text-align:center;margin-bottom:4mm}
.paper .p-ans .a-grid{columns:3;column-gap:6mm;font-size:11pt}
.paper .a-item{margin-bottom:1.8mm;break-inside:avoid}
.paper .p-blank{display:inline-block;min-width:22mm;border-bottom:1px solid #333;height:1em;vertical-align:-2px;margin:0 2px}
.paper .p-opts{font-size:10.5pt;color:#333}
.p-empty{text-align:center;color:#999;padding:40px 0;font-size:14px}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(16px);
  background:var(--ink);color:#fdf9ee;padding:10px 20px;border-radius:10px;font-size:14px;
  opacity:0;pointer-events:none;transition:.25s;z-index:99;box-shadow:var(--shadow-up)
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- 打印 ---------- */
@media print{
  body{background:#fff;background-image:none}
  .topbar,.sidenav,.toast,.card,.paper-wrap>*{display:none!important}
  .layout,.content{padding:0;margin:0;display:block}
  .view.active{max-width:none;margin:0}
  .view{display:none!important}
  #view-print{display:block!important}
  #view-print .card{display:none!important}
  .paper-wrap{display:block;overflow:visible;padding:0}
  .paper{box-shadow:none;border-radius:0;width:auto;min-height:0;padding:0;margin:0;font-size:12pt}
  @page{size:A4;margin:14mm}
}

/* ---------- 立体几何 3D 动态演示（geo3d.js） ---------- */
.g3{margin:8px 0 2px;text-align:center}
.g3-bar{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;align-items:center;margin-top:6px}
.g3-hint{font-size:12px;color:var(--muted,#8a97ad)}
.g3-b{
  border:1px solid #c9d6ea;background:#fff;color:#2a4a7a;border-radius:999px;
  padding:6px 13px;font-size:13px;line-height:1.2;cursor:pointer;font-family:inherit;
  -webkit-tap-highlight-color:transparent
}
.g3-b:active{transform:scale(.96)}
.g3-b.on{background:#3b6fd4;color:#fff;border-color:#3b6fd4}
.g3-stage{margin-top:8px}
.g3-scene{
  position:relative;perspective:900px;margin:0 auto;max-width:100%;
  background:linear-gradient(180deg,#f8fbfe,#eaf1fa);
  border:1px solid #dce6f4;border-radius:12px;overflow:hidden;
  touch-action:none;cursor:grab;-webkit-user-select:none;user-select:none
}
.g3-scene:active{cursor:grabbing}
.g3-obj{position:absolute;left:50%;top:50%;transform-style:preserve-3d}
.g3-face{
  position:absolute;transform-style:preserve-3d;
  display:flex;align-items:center;justify-content:center;font-weight:700;
  color:#1d2b48;font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif
}
/* 正反双层纸片：正面带数字，反面空白纸——转到背面时不再被裁掉 */
.g3-fb{
  position:absolute;left:0;top:0;width:100%;height:100%;box-sizing:border-box;
  border:1.5px solid #4a6fa5;background:#e8f0fb;
  display:flex;align-items:center;justify-content:center;
  backface-visibility:hidden;-webkit-backface-visibility:hidden
}
.g3-fb.f{transform:translateZ(0.4px)}
.g3-fb.b{transform:rotateX(180deg) translateZ(0.4px)}
.g3-face.hi .g3-fb.f{background:#fff3c4;border:2px solid #d33;color:#a00}
.g3-cube{position:absolute;transform-style:preserve-3d}
.g3-cf{position:absolute;box-sizing:border-box;border:1px solid #4a6fa5;backface-visibility:hidden}
.g3-msg{margin-top:7px;font-size:13px;color:#2a4a7a;min-height:18px;padding:0 6px}
.g3-slot{margin-top:4px}
.g3-slider{
  width:min(320px,86%);accent-color:#3b6fd4;cursor:pointer;height:22px;
  -webkit-appearance:none;appearance:none;background:transparent
}
.g3-slider::-webkit-slider-runnable-track{
  height:8px;border-radius:999px;
  background:linear-gradient(90deg,#bfd4f2,#e6eefb)
}
.g3-slider::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;width:22px;height:22px;border-radius:50%;
  background:#3b6fd4;border:3px solid #fff;box-shadow:0 1px 4px rgba(30,64,140,.35);
  margin-top:-7px
}
.g3-slider:active::-webkit-slider-thumb{background:#2a55b0}

/* ---------- 答案动画图解（QANIM） ---------- */
.q-anim-bar{margin-top:8px}
.q-anim-btn{
  border:1px solid #c9d6ea;background:#fff;color:#2a4a7a;border-radius:999px;
  padding:6px 14px;font-size:13px;cursor:pointer;font-family:inherit;
  -webkit-tap-highlight-color:transparent
}
.q-anim-btn:active{transform:scale(.96)}
.q-anim{margin-top:8px;padding:10px 12px;background:#f7faff;border:1px solid #dce6f4;border-radius:12px;overflow-x:auto}
.vs-cap{font-size:13px;font-weight:600;color:#27406b;line-height:1.55;margin-bottom:6px}
.vs-tip{font-size:12px;color:#66789a;font-weight:400;margin-top:2px}
.vs-chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.vs-chip{
  background:#fff;border:1px solid #cdd9ec;border-radius:999px;padding:3px 10px;
  font-size:12px;color:#2a4a7a;opacity:0;animation:vsPop .4s ease forwards
}
.vstep{display:inline-flex;flex-direction:column;font-family:ui-monospace,SFMono-Regular,Consolas,"Courier New",monospace;font-size:21px;line-height:1.4}
.vs-row{display:grid}
.vs-line{border-top:2px solid #5b7cb1;height:0;margin:3px 0 1px;opacity:0;animation:vsPop .3s ease forwards}
.vd{height:1.5em;display:flex;align-items:center;justify-content:center;position:relative}
.vd.pop{opacity:0;animation:vsPop .3s ease forwards}
.vd.pop.hl{animation:vsPop .3s ease forwards,vsHL 1.1s ease forwards}
.vd.drop{opacity:0;animation:vsDrop .45s cubic-bezier(.2,.8,.3,1.15) forwards}
.vd.vtop{border-top:2px solid #5b7cb1}
.vd.vbring{box-shadow:0 0 0 2px #8fb1e8;border-radius:5px}
.vcarry{position:absolute;top:-4px;left:50%;transform:translateX(-50%);color:#d33;font-size:11px;font-weight:700;white-space:nowrap;opacity:0;animation:vsPop .3s ease forwards;z-index:1}
.vbracket{border-left:2.5px solid #5b7cb1;border-top:2.5px solid #5b7cb1;border-radius:0 8px 0 0;margin:0 2px}
.vpt{position:absolute;left:-5px;bottom:4px;font-size:1.15em;font-weight:700;color:#1d2b48;opacity:0;animation:vsDrop .4s ease forwards}
@keyframes vsPop{to{opacity:1}}
@keyframes vsDrop{from{opacity:0;transform:translateY(-16px) scale(.7)}to{opacity:1;transform:none}}
@keyframes vsHL{0%,55%{background:#ffe9a8}100%{background:transparent}}
.vgwrap{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-start}
.vgblk{background:#fff;border:1px solid #d5e0f0;border-radius:10px;padding:8px}
.vg-title{font-size:12px;color:#5a6c8c;text-align:center;margin-top:5px}
.vg{display:grid;gap:3px}
.vg-cnt{font-size:13px;color:#2a4a7a;display:flex;align-items:flex-end;justify-content:center;font-weight:700;opacity:0;animation:vsPop .35s ease forwards}
.vg-cell{width:26px;height:26px;border:1.5px solid #4a6fa5;background:#e8f0fb;border-radius:6px;position:relative;opacity:0;animation:vsPop .35s ease forwards}
.vg-cell.empty{visibility:hidden}
.vg-cell .m{position:absolute;right:-7px;bottom:-8px;background:#d33;color:#fff;border-radius:8px;font-size:10px;font-style:normal;padding:0 4px;line-height:14px;opacity:0;animation:vsPop .35s ease forwards}
.vg-cell.base{background:#c3d6ef;border-color:#38598f;color:#1d3a66;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}
@media (max-width:480px){.vstep{font-size:17px}.vg-cell{width:22px;height:22px}.vg{gap:2px}}
.q-anim-ctl{display:flex;align-items:center;gap:8px;margin:0 0 10px;padding:7px 10px;background:#eef4fb;border:1px solid #d5e2f2;border-radius:10px}
.q-anim-ctl .q-anim-play{border:none;background:#4a6fa5;color:#fff;border-radius:8px;font-size:12px;font-weight:600;padding:5px 12px;cursor:pointer;white-space:nowrap}
.q-anim-ctl .q-anim-play:active{background:#3a5a8c}
.q-anim-ctl input[type=range]{flex:1;min-width:60px;accent-color:#4a6fa5;height:20px;margin:0;cursor:pointer}
.q-anim-hint{font-size:11px;color:#7a8bab;white-space:nowrap}
.g3-face.hi2 .g3-fb.f{background:#e5f3ff;border:2px solid #1d78d2;color:#0c4c8c}