/* ============================================================
   乐学中文 · 样式表
   主色：中国红 / 金色（中泰共通元素）/ 暖白底
   ============================================================ */

:root{
  --red:#E0403F;
  --red-d:#C22F2E;
  --red-l:#FDECEB;
  --gold:#F7B32B;
  --gold-l:#FFF6E2;
  --teal:#2FA6A0;
  --teal-l:#E7F6F5;
  --ink:#2B2118;
  --ink-2:#5A4B3F;
  --muted:#93857A;
  --bg:#FFF8F3;
  --card:#FFFFFF;
  --line:#F1E5DA;
  --shadow:0 2px 10px rgba(120,80,50,.06);
  --shadow-lg:0 8px 30px rgba(120,80,50,.12);
  --r:16px;
  --r-sm:10px;
  --ok:#23A06B;
  --warn:#E8892B;
  --nav-h:62px;
  --top-h:56px;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans Thai",
    "Leelawadee UI",system-ui,-apple-system,"Segoe UI",sans-serif;
  background:var(--bg);color:var(--ink);
  font-size:15px;line-height:1.6;
  padding-bottom:calc(var(--nav-h) + 10px);
  padding-top:var(--top-h);
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;font-size:inherit}
input,select,textarea{font-family:inherit;font-size:15px;color:var(--ink)}
h1,h2,h3,h4{margin:0;font-weight:700}
ul{margin:0;padding:0;list-style:none}

/* ---------------- 顶栏 ---------------- */
#topbar{
  position:fixed;top:0;left:0;right:0;height:var(--top-h);z-index:50;
  background:linear-gradient(100deg,var(--red),var(--red-d) 70%,#9E2422);
  color:#fff;display:flex;align-items:center;justify-content:space-between;
  padding:0 14px;box-shadow:0 2px 12px rgba(160,40,40,.25);
}
.tb-left{display:flex;align-items:center;gap:8px;min-width:0}
.tb-logo{
  width:30px;height:30px;border-radius:9px;background:var(--gold);color:#7A3B00;
  display:grid;place-items:center;font-weight:800;font-size:17px;flex:none;
  box-shadow:0 2px 6px rgba(0,0,0,.15);
}
.tb-name{font-weight:700;font-size:16px;white-space:nowrap}
.tb-sub{font-size:11.5px;opacity:.8;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:none}
@media(min-width:760px){.tb-sub{display:block}}
.tb-right{display:flex;align-items:center;gap:6px;flex:none}
.tb-right .chip{background:rgba(255,255,255,.16);color:#fff;border:none}
.chip-gold{background:rgba(247,179,43,.28)!important;color:#FFE9B8!important}

/* ---------------- 底部导航 ---------------- */
#navbar{
  position:fixed;left:0;right:0;bottom:0;height:var(--nav-h);z-index:50;
  background:rgba(255,255,255,.96);backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
  display:flex;align-items:stretch;overflow-x:auto;scrollbar-width:none;
  padding:0 4px;box-shadow:0 -2px 14px rgba(120,80,50,.06);
}
#navbar::-webkit-scrollbar{display:none}
.nav-btn{
  flex:1 0 auto;min-width:66px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:3px;color:var(--muted);font-size:10.5px;padding:6px 4px;border-radius:12px;
  transition:.16s;position:relative;
}
.nav-btn i{font-size:19px;font-style:normal;line-height:1;transition:.16s}
.nav-btn.on{color:var(--red);font-weight:700}
.nav-btn.on i{transform:translateY(-1px) scale(1.08)}
.nav-btn.on::after{
  content:"";position:absolute;top:4px;width:26px;height:3px;border-radius:3px;background:var(--red);
}

/* ---------------- 布局 ---------------- */
#view{max-width:900px;margin:0 auto;padding:14px 14px 24px;min-height:60vh}

/* ---------------- 通用组件 ---------------- */
.card{
  background:var(--card);border-radius:var(--r);padding:15px;margin-bottom:12px;
  box-shadow:var(--shadow);border:1px solid rgba(241,229,218,.8);
}
.card-title{font-size:15px;margin-bottom:10px;display:flex;align-items:center;gap:6px}
.muted{color:var(--muted);font-size:13.5px;line-height:1.7}
.muted.sm{font-size:12px}
.mt8{margin-top:8px}.mt12{margin-top:12px}.mb12{margin-bottom:12px}
.w50{width:50%}.w100{width:100%}
.row{display:flex;align-items:center}
.row-between{display:flex;align-items:center;justify-content:space-between;gap:10px}
.row-center{display:flex;align-items:center;justify-content:center}
.gap8{gap:8px}
.row.gap8>.btn,.row-center.gap8>.btn{flex:0 1 auto}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}

.btn{
  padding:10px 16px;border-radius:11px;font-size:14.5px;font-weight:600;
  background:#F4EDE7;color:var(--ink-2);transition:.15s;display:inline-flex;
  align-items:center;justify-content:center;gap:6px;white-space:nowrap;
}
.btn:active{transform:scale(.975)}
.btn:disabled{opacity:.45;pointer-events:none}
.btn-primary{background:linear-gradient(135deg,var(--red),var(--red-d));color:#fff;box-shadow:0 3px 10px rgba(224,64,63,.28)}
.btn-ok{background:linear-gradient(135deg,#2DB37A,#1E8F60);color:#fff;box-shadow:0 3px 10px rgba(35,160,107,.25)}
.btn-soft{background:var(--red-l);color:var(--red-d)}
.btn-ghost{background:#fff;border:1.5px solid var(--line);color:var(--ink-2)}
.btn-sm{padding:7px 12px;font-size:13px;border-radius:9px}
.btn-round{border-radius:999px}
.mini{
  min-width:30px;height:30px;border-radius:9px;background:#F4EDE7;color:var(--ink-2);
  font-size:13px;display:inline-grid;place-items:center;padding:0 8px;
}
.mini.on{background:var(--ok);color:#fff}

.chip{
  display:inline-flex;align-items:center;gap:4px;padding:4px 11px;border-radius:999px;
  background:#F4EDE7;color:var(--ink-2);font-size:12.5px;font-weight:600;white-space:nowrap;
  border:1.5px solid transparent;
}
.chip.on{background:var(--red);color:#fff}
.chip.sm{padding:3px 9px;font-size:12px;min-width:30px;justify-content:center}
.chip.has{background:var(--teal-l);color:#1B7C77}
.chip.has.on{background:var(--red);color:#fff}
.chips{display:flex;align-items:center;gap:6px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
.chips.wrap{flex-wrap:wrap;overflow:visible}
.chips::-webkit-scrollbar{display:none}
.badge-soft{background:var(--gold-l);color:#9A6200;font-size:12px;padding:3px 10px;border-radius:999px;font-weight:600}

.bar{height:7px;border-radius:999px;background:#F1E8E0;overflow:hidden;margin-top:7px}
.bar.lg{height:10px;margin-bottom:14px}
.bar.sm{height:5px;margin-top:5px}
.bar>i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--red),var(--gold));transition:.4s}

.tip-soft{
  background:var(--gold-l);border-left:3px solid var(--gold);border-radius:8px;
  padding:9px 12px;font-size:12.5px;color:#8A5B00;line-height:1.65;margin-bottom:12px;
}
.banner{
  border-radius:var(--r);padding:13px 15px;margin-bottom:12px;display:flex;
  align-items:center;justify-content:space-between;gap:10px;font-size:13.5px;font-weight:600;cursor:pointer;
}
.banner.warn{background:linear-gradient(100deg,#FFF1DC,#FFE6C4);color:#8A5B00;border:1px solid #FFDCA8}
.big-ok{font-size:16px;font-weight:700;color:var(--ok);text-align:center;padding:16px 0 8px}

/* ---------------- 页面头 ---------------- */
.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:14px}
.ph-hi{font-size:19px;font-weight:800;letter-spacing:.2px}
.ph-sub{font-size:12.5px;color:var(--muted);margin-top:2px}

/* ---------------- 数据卡 ---------------- */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:12px}
.stat-grid.four{grid-template-columns:repeat(4,1fr)}
.stat{
  background:var(--card);border-radius:var(--r-sm);padding:10px 6px;text-align:center;
  box-shadow:var(--shadow);border:1px solid rgba(241,229,218,.8);
}
.st-i{font-size:17px}
.st-v{font-size:18px;font-weight:800;color:var(--red-d);line-height:1.25}
.st-l{font-size:10.5px;color:var(--muted);margin-top:1px}

/* ---------------- 首页 ---------------- */
.task-row{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px dashed var(--line);cursor:pointer}
.task-row:last-child{border-bottom:none}
.tr-dot{width:7px;height:7px;border-radius:50%;background:var(--red);flex:none}
.tr-body{flex:1;min-width:0}
.tr-t{font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tr-s{font-size:11.5px;color:var(--muted)}
.tr-go{color:var(--red);font-weight:700}

.lesson-hero{
  display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;
  background:linear-gradient(120deg,var(--red),var(--red-d) 60%,#A82624);
  color:#fff;border-radius:var(--r);padding:16px;box-shadow:var(--shadow-lg);margin:-4px 0 2px;
}
.lh-t{font-size:17px;font-weight:800}
.lh-s{font-size:12px;opacity:.85;margin-top:3px}
.lh-btn{background:#fff;color:var(--red-d);padding:8px 14px;border-radius:999px;font-size:13px;font-weight:700;white-space:nowrap}

.badge-row{display:flex;gap:10px;overflow-x:auto;scrollbar-width:none;padding-bottom:2px}
.badge-row.wrap{flex-wrap:wrap;overflow:visible}
.badge-row::-webkit-scrollbar{display:none}
.badge{
  flex:0 0 auto;width:84px;text-align:center;background:var(--gold-l);border-radius:12px;
  padding:9px 6px;border:1px solid #FFE4B0;
}
.badge span{font-size:24px;display:block}
.badge i{font-style:normal;font-size:11.5px;font-weight:700;color:#8A5B00;display:block}
.badge em{font-style:normal;font-size:9.5px;color:#B08A4A;display:block;line-height:1.3;margin-top:2px}
.badge.off{background:#F6F2EE;border-color:#EDE4DB;filter:grayscale(1);opacity:.55}

/* ---------------- 课程 ---------------- */
.book-scroll{display:flex;gap:8px;overflow-x:auto;padding:2px 0 12px;scrollbar-width:none}
.book-scroll::-webkit-scrollbar{display:none}
.book-chip{
  flex:0 0 auto;min-width:78px;padding:9px 12px;border-radius:12px;background:var(--card);
  border:1.5px solid var(--line);display:flex;flex-direction:column;align-items:center;gap:1px;
  box-shadow:var(--shadow);transition:.15s;
}
.book-chip b{font-size:13px}
.book-chip span{font-size:10.5px;color:var(--muted)}
.book-chip.on{background:linear-gradient(135deg,var(--red),var(--red-d));border-color:transparent;color:#fff}
.book-chip.on span{color:rgba(255,255,255,.8)}

.unit-block{margin-bottom:14px}
.unit-head{
  display:flex;align-items:center;justify-content:space-between;padding:0 4px 7px;
  font-size:13.5px;font-weight:800;color:var(--ink-2);
}
.unit-head span{display:inline-flex;align-items:center;gap:6px}
.unit-head span::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--red)}
.unit-head em{font-style:normal;font-size:11px;color:var(--muted);font-weight:500}

.lesson-row{
  display:flex;align-items:center;gap:11px;background:var(--card);border-radius:13px;
  padding:11px 12px;margin-bottom:7px;box-shadow:var(--shadow);cursor:pointer;
  border:1px solid rgba(241,229,218,.8);transition:.15s;
}
.lesson-row:active{transform:scale(.99)}
.lesson-row.dim{opacity:.62;cursor:default}
.lr-no{
  width:32px;height:32px;border-radius:10px;background:var(--red-l);color:var(--red-d);
  display:grid;place-items:center;font-weight:800;font-size:14px;flex:none;
}
.lr-body{flex:1;min-width:0}
.lr-t{font-size:14.5px;font-weight:700}
.lr-s{font-size:11.5px;color:var(--muted)}
.lr-st{font-size:13px;font-weight:800;color:var(--ok);flex:none}
.tag-wait{background:#F1EAE3;color:var(--muted);padding:1px 7px;border-radius:6px;font-size:10.5px}

/* ---------------- 课内五步 ---------------- */
.steps{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;margin-bottom:12px}
.steps::-webkit-scrollbar{display:none}
.step{
  flex:1 0 auto;min-width:76px;display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:8px 4px;border-radius:12px;background:var(--card);border:1.5px solid var(--line);
  font-size:11px;color:var(--muted);font-weight:600;transition:.15s;
}
.step i{
  width:22px;height:22px;border-radius:50%;background:#F1EAE3;color:var(--muted);
  display:grid;place-items:center;font-style:normal;font-size:11.5px;font-weight:800;
}
.step.on{border-color:var(--red);color:var(--red-d);background:var(--red-l)}
.step.on i{background:var(--red);color:#fff}
.step.done i{background:var(--ok);color:#fff}
.step.done{color:var(--ok)}
.sec-title{font-size:14px;font-weight:800;color:var(--red-d);margin-bottom:12px}

.sent-card{background:#FFFCF8;border:1px solid var(--line);border-radius:13px;padding:13px;margin-bottom:10px}
.sc-cn{font-size:19px;font-weight:700;letter-spacing:.5px}
.sc-py{font-size:12.5px;color:var(--teal);margin-top:2px;font-family:"Segoe UI",sans-serif}
.sc-th{font-size:13.5px;color:var(--ink-2);margin-top:3px}

.text-line{position:relative;padding:10px 40px 10px 0;border-bottom:1px dashed var(--line)}
.text-line:last-of-type{border-bottom:none}
.tl-cn{font-size:16px;line-height:1.75}
.tl-py{font-size:11.5px;color:var(--teal);font-family:"Segoe UI",sans-serif}
.tl-th{font-size:12.5px;color:var(--muted)}
.tl-play{
  position:absolute;right:0;top:12px;width:30px;height:30px;border-radius:9px;
  background:var(--red-l);display:grid;place-items:center;font-size:13px;
}

.word-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:9px}
.word-card{
  position:relative;background:linear-gradient(160deg,#FFFDFB,#FFF4EE);border:1.5px solid var(--line);
  border-radius:13px;padding:16px 10px 42px;text-align:center;cursor:pointer;transition:.2s;
  min-height:118px;display:flex;flex-direction:column;justify-content:center;
}
.word-card.seen{border-color:#BFE7D3;background:linear-gradient(160deg,#F7FFFB,#EDFBF4)}
.wc-cn{font-size:25px;font-weight:800;letter-spacing:2px}
.wc-py{font-size:12px;color:var(--teal);font-family:"Segoe UI",sans-serif;min-height:16px}
.word-card .wc-back{display:none}
.word-card.flip .wc-front{display:none}
.word-card.flip .wc-back{display:block;animation:fadeIn .25s}
.wc-th{font-size:14px;font-weight:700;color:var(--red-d)}
.wc-ex{font-size:11.5px;color:var(--ink-2);margin-top:5px;line-height:1.5}
.wc-exth{font-size:11px;color:var(--muted);margin-top:2px}
.wc-actions{position:absolute;left:0;right:0;bottom:8px;display:flex;justify-content:center;gap:6px}
@keyframes fadeIn{from{opacity:0;transform:translateY(3px)}to{opacity:1}}

.hanzi-row{display:flex;flex-wrap:wrap;gap:10px}
.hz{text-align:center;width:108px}
.grid-box{
  width:100px;height:100px;margin:0 auto;border:1.5px solid #E8B9B8;border-radius:10px;
  position:relative;background:#FFFDFC;display:grid;place-items:center;overflow:hidden;
  cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation;
  transition:box-shadow .15s,transform .12s;
}
.grid-box:hover{box-shadow:0 0 0 3px rgba(224,64,63,.12)}
.grid-box:active{transform:scale(.96)}
/* 笔顺 SVG 撑满田字格并居中：绘制时田字格内只保留这一个子元素，
   SVG 与格子同为 100px，字符自然落在正中 */
.grid-box>svg{display:block;width:100%;height:100%;max-width:100%;max-height:100%;position:relative;z-index:1}
.grid-box::before,.grid-box::after{content:"";position:absolute;z-index:2}
.grid-box::before{
  left:50%;top:0;bottom:0;width:1px;
  background:repeating-linear-gradient(#EDB8B7 0 4px,transparent 4px 8px);
}
.grid-box::after{
  top:50%;left:0;right:0;height:1px;
  background:repeating-linear-gradient(90deg,#EDB8B7 0 4px,transparent 4px 8px);
}
/* 静态汉字：只在"未绘制 / 该字无笔顺数据"时出现，所以要清晰可读（原来是浅粉描红底字，看不见） */
.grid-box .ch{font-size:56px;color:#3B4A5A;font-weight:700;font-family:"Kaiti SC","STKaiti",serif;line-height:1}
.hz .lab{font-size:11.5px;color:var(--muted);margin:5px 0 4px;min-height:17px}

/* ---------------- 答题器 ---------------- */
.run-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.run-title{flex:1;text-align:center;font-size:13.5px;font-weight:700;color:var(--ink-2)}
.timer{
  font-family:"SF Mono",Consolas,monospace;font-weight:800;color:var(--red-d);
  background:var(--red-l);padding:3px 10px;border-radius:8px;font-size:13.5px;
}
.q-card{padding:20px 16px}
.q-prompt{font-size:22px;font-weight:800;text-align:center;letter-spacing:1px;margin-bottom:6px}
.q-prompt .py{display:block;font-size:13px;color:var(--teal);font-weight:500;letter-spacing:0;margin-top:4px;font-family:"Segoe UI",sans-serif}
.q-prompt.listen{display:flex;gap:10px;justify-content:center;align-items:center;flex-wrap:wrap}
.q-prompt.fill{font-size:18px;line-height:1.9;font-weight:700}
.q-prompt.read{font-size:20px;line-height:1.8}
.q-tip{text-align:center;font-size:12.5px;color:var(--muted);margin-bottom:14px}
.py-line{text-align:center;font-size:12.5px;color:var(--teal);font-family:"Segoe UI",sans-serif}
.th-line{text-align:center;font-size:13px;color:var(--ink-2)}

.opts{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:6px}
.opts.two{grid-template-columns:1fr 1fr}
.opt{
  padding:14px 12px;border-radius:12px;border:1.5px solid var(--line);background:#fff;
  font-size:15px;font-weight:600;transition:.15s;text-align:center;min-height:52px;
}
.opt:active{transform:scale(.98)}
.opt.sel{border-color:var(--red);background:var(--red-l);color:var(--red-d)}
.opt.right{border-color:var(--ok);background:#EAF8F1;color:#15804F}
.opt.wrong{border-color:#D9534F;background:#FDECEB;color:#B33A36}
.fb{margin-top:12px;padding:11px 13px;border-radius:11px;font-size:13.5px;font-weight:600}
.fb.ok{background:#EAF8F1;color:#15804F}
.fb.no{background:#FDECEB;color:#B33A36}

.result-hero{text-align:center;padding:26px 16px;border-radius:var(--r);margin-bottom:12px;color:#fff}
.result-hero.good{background:linear-gradient(135deg,#2DB37A,#1B8D5E)}
.result-hero.mid{background:linear-gradient(135deg,#F7B32B,#E08C10)}
.result-hero.low{background:linear-gradient(135deg,#E0403F,#B22F2E)}
.rh-ring{font-size:46px;font-weight:800;line-height:1}
.rh-ring small{font-size:15px;font-weight:600;margin-left:3px;opacity:.85}
.rh-txt{font-size:15px;font-weight:700;margin-top:8px}
.rh-sub{font-size:13px;opacity:.9;margin-top:3px}

.wrong-row{padding:11px 0;border-bottom:1px dashed var(--line)}
.wrong-row:last-child{border-bottom:none}
.wr-q{font-size:14px;font-weight:600;margin-bottom:5px}
.wr-a{display:flex;gap:12px;font-size:12.5px;flex-wrap:wrap}
.wr-a .no{color:#B33A36}
.wr-a .ok{color:#15804F;font-weight:700}
.wr-th{font-size:12px;color:var(--muted);margin-top:4px}

/* ---------------- 作业 / 测试 ---------------- */
.hw-card.done{opacity:.72}
.hw-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:5px}
.hw-t{font-size:15px;font-weight:800}
.hw-st{font-size:11.5px;font-weight:700;padding:2px 9px;border-radius:999px;background:#F1EAE3;color:var(--muted)}
.hw-st.ok{background:#EAF8F1;color:#15804F}
.hw-st.over{background:#FDECEB;color:#B33A36}
.hw-meta{font-size:12px;color:var(--muted)}
.hw-row{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px dashed var(--line)}
.hw-row:last-child{border-bottom:none}
.hw-row>div{flex:1}
.hw-prog{font-weight:800;color:var(--red-d);font-size:14px;flex:none!important}

.quiz-row{display:flex;align-items:center;gap:10px;padding:11px 0;border-bottom:1px dashed var(--line)}
.quiz-row:last-child{border-bottom:none}
.qr-body{flex:1}
.qr-t{font-size:14.5px;font-weight:700}
.qr-s{font-size:11.5px;color:var(--muted)}
.hist-row{display:flex;align-items:center;gap:12px;padding:8px 0;border-bottom:1px dashed var(--line);font-size:13px}
.hist-row:last-child{border-bottom:none}
.hist-row span{flex:1;color:var(--ink-2)}
.hist-row b{font-size:16px}
.hist-row b.g{color:#15804F}.hist-row b.m{color:#C57B0A}.hist-row b.r{color:#B33A36}
.hist-row em{font-style:normal;font-size:11px;color:var(--muted)}

/* ---------------- 复习 ---------------- */
.due-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:8px}
.due-card{
  background:linear-gradient(160deg,#FFFDFB,#FFF6EF);border:1px solid var(--line);
  border-radius:11px;padding:10px 8px;text-align:center;position:relative;
}
.due-card b{font-size:19px;display:block;letter-spacing:1px}
.due-card i{font-style:normal;font-size:10.5px;color:var(--teal);font-family:"Segoe UI",sans-serif}
.due-card .box{
  position:absolute;top:5px;right:5px;font-size:9px;background:var(--gold-l);color:#9A6200;
  padding:1px 5px;border-radius:5px;font-weight:700;
}
.review-card{text-align:center;padding:34px 16px}
.rc-cn{font-size:40px;font-weight:800;letter-spacing:4px}
.rc-th{font-size:17px;color:var(--red-d);font-weight:700;margin-top:10px}
.rc-py{font-size:13px;color:var(--teal);font-family:"Segoe UI",sans-serif}
.rc-hide{font-size:13.5px;color:var(--muted);margin-top:12px}

/* ---------------- 错题本 ---------------- */
.wrong-card{}
.wr-top{display:flex;align-items:center;justify-content:space-between}
.wr-top b{font-size:20px;letter-spacing:1px}
.wr-badge{font-size:11px;background:#FDECEB;color:#B33A36;padding:2px 8px;border-radius:999px;font-weight:700}
.wr-mid{font-size:13px;color:var(--ink-2);margin-top:3px}
.wr-src{font-size:11.5px;color:var(--muted);margin-top:2px}

/* ---------------- AI 聊天 ---------------- */
.mode-switch{display:flex;gap:6px;background:#F4EDE7;padding:4px;border-radius:12px;margin-bottom:10px}
.mode-switch button{
  flex:1;padding:8px;border-radius:9px;font-size:13.5px;font-weight:700;color:var(--muted);transition:.15s;
}
.mode-switch button.on{background:#fff;color:var(--red-d);box-shadow:0 2px 8px rgba(120,80,50,.12)}

.chat-box{
  background:var(--card);border-radius:var(--r);padding:14px;min-height:280px;max-height:52vh;
  overflow-y:auto;box-shadow:var(--shadow);border:1px solid rgba(241,229,218,.8);margin-bottom:12px;
}
.chat-hello{display:flex;gap:10px;margin-bottom:12px}
.ch-avatar{width:34px;height:34px;border-radius:11px;background:var(--gold-l);display:grid;place-items:center;font-size:18px;flex:none}
.ch-bubble{background:#FAF6F2;border-radius:4px 14px 14px 14px;padding:11px 13px;font-size:13.5px;line-height:1.7}
.sug-row{display:flex;flex-direction:column;gap:7px;margin-top:6px}
.sug{
  text-align:left;padding:10px 13px;border-radius:11px;background:var(--red-l);color:var(--red-d);
  font-size:13px;font-weight:600;border:1px solid #FBD9D7;
}
.msg{display:flex;gap:9px;margin-bottom:12px;align-items:flex-start}
.msg.me{justify-content:flex-end}
.msg .bubble{
  background:#EAF8F1;border-radius:14px 4px 14px 14px;padding:11px 13px;font-size:13.5px;
  line-height:1.7;max-width:82%;
}
.msg.ai .bubble{background:#FAF6F2;border-radius:4px 14px 14px 14px;color:var(--ink)}
.msg.ai.warn .bubble{background:#FFF4E4;border:1px solid #FFDCA8}
.avatar{width:32px;height:32px;border-radius:10px;background:var(--gold-l);display:grid;place-items:center;font-size:17px;flex:none}
.msg .th{color:var(--muted);font-size:12.5px;margin-top:6px;padding-top:6px;border-top:1px dashed #E8DDD3}
.msg .src{font-size:11.5px;color:#1B7C77;background:var(--teal-l);border-radius:7px;padding:4px 9px;margin-top:7px;display:inline-block}
.chat-input{display:flex;gap:8px;position:sticky;bottom:0}
.chat-input input{flex:1;padding:12px 14px;border-radius:12px;border:1.5px solid var(--line);background:#fff}
.chat-input input:focus{outline:none;border-color:var(--red)}

/* ---------------- 我的 ---------------- */
.me-name{font-size:20px;font-weight:800;margin-bottom:10px}
.kv{display:flex;align-items:center;justify-content:space-between;font-size:13.5px;padding:4px 0}
.kv.big b{font-size:22px;letter-spacing:3px;color:var(--red-d);font-family:"SF Mono",Consolas,monospace}
.form-row{display:flex;align-items:center;gap:10px;margin-bottom:9px}
.form-row label{width:88px;font-size:12.5px;color:var(--muted);flex:none}
.form-row input,.form-row select,.form-row textarea{
  flex:1;padding:10px 12px;border-radius:10px;border:1.5px solid var(--line);background:#FEFCFA;min-width:0;
}
.form-row textarea{resize:vertical;line-height:1.6}
.form-row input:focus,.form-row select:focus,.form-row textarea:focus{outline:none;border-color:var(--red);background:#fff}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.form-grid input{padding:10px 12px;border-radius:10px;border:1.5px solid var(--line);background:#FEFCFA;min-width:0}
.form-grid input:focus{outline:none;border-color:var(--red);background:#fff}

/* ---------------- 教师端 ---------------- */
.stu-row{display:flex;align-items:center;gap:11px;padding:10px 0;border-bottom:1px dashed var(--line)}
.stu-row:last-child{border-bottom:none}
.sr-avatar{
  width:36px;height:36px;border-radius:11px;background:var(--red-l);color:var(--red-d);
  display:grid;place-items:center;font-weight:800;flex:none;
}
.sr-body{flex:1;min-width:0}
.sr-t{font-size:14.5px;font-weight:700}
.sr-s{font-size:11.5px;color:var(--muted)}
.sr-time{font-size:11px;color:var(--muted);flex:none}

.top-row{display:flex;align-items:center;gap:10px;padding:8px 0}
.tr-i{width:22px;height:22px;border-radius:7px;background:var(--gold-l);color:#9A6200;display:grid;place-items:center;font-size:11.5px;font-weight:800;flex:none}
.tr-b{flex:1;min-width:0}
.tr-t{font-size:13.5px;font-weight:700}
.tr-t em{font-style:normal;font-size:11.5px;color:var(--muted);font-weight:400;margin-left:5px}
.tr-n{font-size:11px;color:var(--muted);flex:none}

.tbl-wrap{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;font-size:13px}
.tbl th{text-align:left;padding:8px 6px;color:var(--muted);font-weight:600;font-size:11.5px;border-bottom:1.5px solid var(--line);white-space:nowrap}
.tbl td{padding:9px 6px;border-bottom:1px dashed var(--line);white-space:nowrap}
.tbl tr:last-child td{border-bottom:none}

.qa-card.done{opacity:.8}
.qa-top{display:flex;align-items:center;gap:8px;margin-bottom:7px;flex-wrap:wrap}
.qa-user{font-size:12.5px;font-weight:700;color:var(--red-d)}
.qa-time{font-size:11px;color:var(--muted);flex:1}
.qa-q{font-size:14.5px;font-weight:600;background:#FAF6F2;border-radius:10px;padding:10px 12px;margin-bottom:10px}
.qa-a{background:var(--teal-l);border-radius:10px;padding:10px 12px;font-size:13.5px;line-height:1.7}
.qa-a b{font-size:12px;color:#1B7C77;display:block;margin-bottom:3px}
.qa-a .th{font-size:12.5px;color:var(--muted);margin-top:5px;padding-top:5px;border-top:1px dashed #CDE7E4}

.draft-body{background:#FAF6F2;border-radius:10px;padding:11px 13px}
.db-main{font-size:19px;font-weight:800;letter-spacing:1px}
.db-sub{font-size:12.5px;color:var(--teal);font-family:"Segoe UI",sans-serif}
.db-ex{font-size:12.5px;color:var(--ink-2);margin-top:4px}

.prev-sec{padding:7px 0;border-bottom:1px dashed var(--line);font-size:13px;line-height:1.8}
.prev-sec:last-child{border-bottom:none}
.prev-sec b{display:block;font-size:12px;color:var(--muted);margin-bottom:2px}

/* ---------------- 登录页 ---------------- */
.login-wrap{display:flex;flex-direction:column;gap:0;padding:0 0 20px}
.login-hero{
  background:linear-gradient(150deg,var(--red),var(--red-d) 55%,#9A2422);
  color:#fff;border-radius:0 0 26px 26px;padding:34px 22px 30px;margin:-14px -14px 18px;
  box-shadow:var(--shadow-lg);
}
.lh-badge{
  width:54px;height:54px;border-radius:16px;background:var(--gold);color:#7A3B00;
  display:grid;place-items:center;font-size:29px;font-weight:800;margin-bottom:14px;
  box-shadow:0 4px 14px rgba(0,0,0,.18);
}
.login-hero h1{font-size:27px;letter-spacing:1px}
.login-hero p{font-size:13px;opacity:.86;margin:6px 0 16px}
.lh-points{display:flex;flex-direction:column;gap:7px;font-size:12.5px;opacity:.94}
.lh-points li{background:rgba(255,255,255,.12);padding:8px 12px;border-radius:10px}
.login-card{background:var(--card);border-radius:var(--r);padding:18px;box-shadow:var(--shadow);border:1px solid rgba(241,229,218,.8)}
.tabs{display:flex;gap:6px;background:#F4EDE7;padding:4px;border-radius:12px;margin-bottom:16px}
.tabs button{flex:1;padding:9px;border-radius:9px;font-weight:700;font-size:14px;color:var(--muted)}
.tabs button.on{background:#fff;color:var(--red-d);box-shadow:0 2px 8px rgba(120,80,50,.12)}
.divider{display:flex;align-items:center;gap:10px;margin:16px 0;color:var(--muted);font-size:12px}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line)}

/* ---------------- toast ---------------- */
#toast{position:fixed;left:50%;bottom:calc(var(--nav-h) + 16px);transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast-item{
  background:rgba(43,33,24,.93);color:#fff;padding:10px 18px;border-radius:999px;font-size:13.5px;
  font-weight:600;opacity:0;transform:translateY(10px);transition:.28s;max-width:84vw;text-align:center;
  box-shadow:0 8px 24px rgba(0,0,0,.2);
}
.toast-item.in{opacity:1;transform:translateY(0)}
.toast-item.ok{background:rgba(21,128,79,.95)}
.toast-item.warn{background:rgba(196,110,20,.95)}

/* ---------------- 页脚 ---------------- */
.foot{
  max-width:900px;margin:0 auto;padding:8px 14px 20px;text-align:center;
  font-size:11px;color:#B7A99C;line-height:1.7;
}

@media(max-width:400px){
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .opts{grid-template-columns:1fr}
  .opts.two{grid-template-columns:1fr 1fr}
  .form-grid{grid-template-columns:1fr}
}
@media(min-width:760px){
  #navbar{justify-content:center;gap:4px}
  .nav-btn{flex:0 1 92px}
  .stat-grid{grid-template-columns:repeat(4,1fr)}
}