:root{
    --cream:#FFFBF3;
    --card:#FFFFFF;
    --ink:#33281D;
    --ink2:#6E5C49;
    --ink3:#A89883;
    --orange:#FF8A1E;
    --orange-d:#E96A00;
    --orange-l:#FFF1E0;
    --ok:#2E9C7C;
    --ok-l:#E9F7F1;
    --bad:#D45C3E;
    --bad-l:#FDEDE8;
    --line:#F2E7D7;
    --shadow:0 2px 10px rgba(180,140,90,.08);
  }
  *{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
  html,body{margin:0;padding:0}
  body{
    background:var(--cream);
    color:var(--ink);
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
    font-size:17px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
    -webkit-text-size-adjust:100%;
  }
  .app{max-width:520px;margin:0 auto;padding:0 18px calc(34px + env(safe-area-inset-bottom))}
  .view{display:none;animation:fade .28s ease}
  .view.on{display:block}
  @keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

  /* ---------- 通用 ---------- */
  .tag{display:inline-block;font-size:12px;letter-spacing:.06em;color:var(--orange-d);
       background:var(--orange-l);padding:4px 10px;border-radius:99px;font-weight:600}
  .btn{
    display:flex;align-items:center;justify-content:center;gap:8px;
    width:100%;border:0;border-radius:16px;padding:16px;font-size:17.5px;font-weight:700;
    font-family:inherit;color:#fff;background:linear-gradient(135deg,#FFA03C,#F27000);
    box-shadow:0 6px 18px rgba(242,112,0,.22);cursor:pointer;
    transition:transform .12s ease,opacity .2s;
  }
  .btn:active{transform:scale(.985)}
  .btn[disabled]{opacity:.4;box-shadow:none}
  .btn.ghost{background:#fff;color:var(--ink2);border:1.5px solid var(--line);box-shadow:none;font-weight:600}
  .link{color:var(--orange-d);font-weight:600;text-decoration:none;cursor:pointer}

  /* ---------- 首页 ---------- */
  .hero{padding:34px 0 8px}
  .hero h1{font-size:34px;line-height:1.18;margin:14px 0 6px;letter-spacing:-.01em}
  .hero h1 small{display:block;font-size:14px;font-weight:500;color:var(--ink3);letter-spacing:.02em;margin-top:8px}
  .chips{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0 22px}
  .chip{font-size:13px;color:var(--ink2);background:#fff;border:1px solid var(--line);
        padding:7px 10px;border-radius:99px;white-space:nowrap}
  .field{margin-bottom:13px}
  .field label{display:block;font-size:13.5px;color:var(--ink2);font-weight:600;margin-bottom:7px}
  .field input{
    width:100%;border:1.5px solid var(--line);background:#fff;border-radius:14px;
    padding:15px 16px;font-size:17px;font-family:inherit;color:var(--ink);outline:none;
    transition:border-color .18s;
  }
  .field input:focus{border-color:var(--orange)}
  .field input::placeholder{color:#C9BCAA}
  .card{background:var(--card);border-radius:20px;padding:20px;box-shadow:var(--shadow);margin-top:18px}
  .story-card{
    display:flex;align-items:center;gap:15px;background:linear-gradient(135deg,#FFF6E6,#FFEBD2);
    border:1px solid #FBE3C4;border-radius:20px;padding:18px;margin-top:14px;cursor:pointer;
  }
  .story-card .moon{width:46px;height:46px;flex:0 0 46px}
  .story-card h3{margin:0;font-size:16.5px}
  .story-card p{margin:3px 0 0;font-size:13px;color:#9A7A54}
  .foot{margin-top:34px;text-align:center}
  .foot .entry{font-size:12px;color:#DCCDBA;letter-spacing:.08em;text-decoration:none}

  /* ---------- 答题 ---------- */
  .qtop{position:sticky;top:0;z-index:9;background:linear-gradient(180deg,var(--cream) 72%,rgba(255,251,243,0)) ;
         padding:14px 0 10px;margin:0 -18px;padding-left:18px;padding-right:18px}
  .qtop .row{display:flex;justify-content:space-between;align-items:baseline;font-size:13px;color:var(--ink3)}
  .qtop .row b{color:var(--orange-d);font-size:15px}
  .bar{height:6px;background:#F3E7D6;border-radius:99px;margin-top:9px;overflow:hidden}
  .bar i{display:block;height:100%;width:0;border-radius:99px;
         background:linear-gradient(90deg,#FFB457,#F27000);transition:width .35s ease}
  .qtype{font-size:12.5px;color:var(--ink3);margin:22px 0 8px;font-weight:600;letter-spacing:.04em}
  .stem{font-size:19px;line-height:1.72;font-weight:600;margin:0 0 20px;letter-spacing:.01em}
  .stem .blank{display:inline-block;min-width:74px;border-bottom:2px solid var(--orange);
               margin:0 3px;text-align:center}

  .opts{display:flex;flex-direction:column;gap:11px}
  .opt{
    display:flex;gap:13px;align-items:flex-start;background:#fff;border:1.5px solid var(--line);
    border-radius:16px;padding:15px 16px;font-size:16.5px;line-height:1.55;cursor:pointer;
    transition:border-color .16s,background .16s;
  }
  .opt .k{flex:0 0 25px;height:25px;border-radius:50%;background:#F7EEE1;color:var(--ink2);
          font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:1px}
  .opt.sel{border-color:var(--orange);background:var(--orange-l)}
  .opt.sel .k{background:var(--orange);color:#fff}
  .opt.right{border-color:var(--ok);background:var(--ok-l)}
  .opt.right .k{background:var(--ok);color:#fff}
  .opt.wrong{border-color:var(--bad);background:var(--bad-l)}
  .opt.wrong .k{background:var(--bad);color:#fff}
  .opt.dim{opacity:.5}
  .opt .num{flex:0 0 25px;height:25px;border-radius:50%;border:1.5px dashed #E2D3BE;color:var(--ink3);
            font-size:12.5px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:1px}
  .opt .num.filled{background:var(--orange);border-color:var(--orange);color:#fff;border-style:solid}

  .fills{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:4px}
  .fill{display:flex;flex-direction:column;gap:6px;flex:1 1 46%}
  .fill span{font-size:12.5px;color:var(--ink3);font-weight:600}
  .fill input{width:100%;border:1.5px solid var(--line);background:#fff;border-radius:13px;
              padding:14px;font-size:17px;font-family:inherit;outline:none;text-align:center}
  .fill input:focus{border-color:var(--orange)}
  .fill input.right{border-color:var(--ok);background:var(--ok-l)}
  .fill input.wrong{border-color:var(--bad);background:var(--bad-l)}
  .fillok{font-size:13px;color:var(--ok);font-weight:600}

  .fb{margin-top:18px;border-radius:16px;padding:15px 17px;font-size:15px;line-height:1.68;display:none}
  .fb.on{display:block;animation:fade .25s ease}
  .fb.ok{background:var(--ok-l);color:#1F6E56;border:1px solid #CDEADF}
  .fb.no{background:var(--bad-l);color:#9C3B23;border:1px solid #F7D5CB}
  .fb b{display:block;margin-bottom:3px;font-size:15.5px}
  .fb .ans{color:#9C3B23;font-weight:700}
  .qbottom{
    position:fixed;left:0;right:0;bottom:0;z-index:20;
    max-width:520px;margin:0 auto;
    padding:12px 18px calc(12px + env(safe-area-inset-bottom));
    background:linear-gradient(0deg,var(--cream) 68%,rgba(255,251,243,0));
  }
  #v-quiz{padding-bottom:112px}

  /* ---------- 结果 ---------- */
  .score-wrap{text-align:center;padding:26px 0 6px}
  .score{font-size:68px;font-weight:800;line-height:1;letter-spacing:-.03em;
         background:linear-gradient(135deg,#FFA03C,#EE6A00);-webkit-background-clip:text;background-clip:text;color:transparent}
  .score small{font-size:19px;font-weight:700;color:var(--ink3);margin-left:3px;-webkit-text-fill-color:var(--ink3)}
  .score-tip{font-size:15px;color:var(--ink2);margin-top:10px}
  .mini{display:flex;gap:10px;margin-top:20px}
  .mini div{flex:1;background:#fff;border-radius:16px;padding:13px 8px;text-align:center;box-shadow:var(--shadow)}
  .mini b{display:block;font-size:19px}
  .mini span{font-size:12px;color:var(--ink3)}
  .sec-t{font-size:14px;font-weight:700;color:var(--ink2);margin:26px 0 12px;display:flex;align-items:center;gap:8px}
  .sec-t:before{content:"";width:3px;height:14px;border-radius:2px;background:var(--orange)}
  .wrong-item{background:#fff;border-radius:16px;padding:15px 17px;margin-bottom:11px;box-shadow:var(--shadow)}
  .wrong-item .q{font-size:15.5px;font-weight:600;line-height:1.6;margin:0 0 9px}
  .wrong-item .l{font-size:13.5px;line-height:1.75;color:var(--ink2)}
  .wrong-item .l em{font-style:normal;color:var(--bad);font-weight:700}
  .wrong-item .l i{font-style:normal;color:var(--ok);font-weight:700}
  .wrong-item .ex{margin-top:7px;font-size:13px;color:var(--ink3);line-height:1.65;
                  border-top:1px dashed var(--line);padding-top:8px}
  .uploading{font-size:12.5px;color:var(--ink3);text-align:center;margin-top:16px}

  /* ---------- 睡前故事 ---------- */
  .night{background:linear-gradient(180deg,#FFF8EC 0%,#FFF2DE 40%,#FFEBD1 100%);
         border-radius:0 0 30px 30px;margin:0 -18px;padding:26px 18px 22px;text-align:center;position:relative;overflow:hidden}
  .night h1{font-size:25px;margin:12px 0 6px;letter-spacing:.01em}
  .night p{margin:0;font-size:13px;color:#A98A63}
  .moonlg{width:74px;height:74px;margin:0 auto 6px}
  .player{display:flex;align-items:center;gap:14px;margin-top:6px}
  .play{flex:0 0 58px;width:58px;height:58px;border-radius:50%;border:0;cursor:pointer;
        background:linear-gradient(135deg,#FFA03C,#F27000);box-shadow:0 8px 22px rgba(242,112,0,.3);
        display:flex;align-items:center;justify-content:center;color:#fff;font-size:0}
  .play:active{transform:scale(.95)}
  .player .info{flex:1;text-align:left}
  .player .info b{font-size:15px;display:block}
  .player .info span{font-size:12.5px;color:var(--ink3)}
  .rates{display:flex;gap:7px;margin-top:4px}
  .rates button{border:1px solid var(--line);background:#fff;border-radius:99px;padding:5px 11px;
                font-size:12.5px;font-family:inherit;color:var(--ink2);cursor:pointer}
  .rates button.on{background:var(--orange);border-color:var(--orange);color:#fff;font-weight:600}
  .lines{padding:22px 0 128px}
  .lines p{font-size:17.5px;line-height:2.05;margin:0 0 2px;color:#6B5A47;
           transition:color .4s,opacity .4s;opacity:.68}
  .lines p.now{color:var(--ink);opacity:1;font-weight:600}
  .lines p.gap{height:14px;margin:0}
  .stopbar{position:fixed;left:0;right:0;bottom:0;padding:12px 18px calc(12px + env(safe-area-inset-bottom));
           background:linear-gradient(0deg,#FFEBD1 60%,rgba(255,235,209,0));
           display:flex;gap:10px;max-width:520px;margin:0 auto}
  .stopbar .btn{font-size:15px;padding:13px}

  /* ---------- 教师端 ---------- */
  .t-head{padding:24px 0 4px}
  .t-head h1{font-size:24px;margin:10px 0 2px}
  .t-head p{font-size:13px;color:var(--ink3);margin:0}
  .stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:18px}
  .stat{background:#fff;border-radius:16px;padding:15px;box-shadow:var(--shadow)}
  .stat b{display:block;font-size:26px;line-height:1.2}
  .stat span{font-size:12.5px;color:var(--ink3)}
  .rows{background:#fff;border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}
  .row-item{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid #FAF3E9}
  .row-item:last-child{border-bottom:0}
  .row-item .nm{flex:1;min-width:0}
  .row-item .nm b{font-size:15.5px;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .row-item .nm span{font-size:12px;color:var(--ink3)}
  .row-item .sc{font-size:19px;font-weight:800;color:var(--orange-d);width:52px;text-align:right}
  .row-item .sc.low{color:var(--bad)}
  .qrate{margin-bottom:13px}
  .qrate .lab{display:flex;justify-content:space-between;font-size:12.5px;color:var(--ink2);margin-bottom:5px}
  .qrate .lab span:first-child{max-width:78%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .qrate .rb{height:7px;background:#F5EBDC;border-radius:99px;overflow:hidden}
  .qrate .rb i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#FFB457,#F27000)}
  .empty{text-align:center;padding:44px 10px;color:var(--ink3);font-size:14px}
  .topnav{display:flex;justify-content:space-between;align-items:center;padding-top:16px}
  .topnav a{font-size:13.5px;color:var(--ink3);text-decoration:none}

  /* ---------- 注音：拼音标在具体的字上 ---------- */
  ruby{ruby-align:center;ruby-position:over;margin:0 1px}
  ruby rt{font-size:.56em;color:#8E7C66;font-weight:600;letter-spacing:0;line-height:1.15}
  .opt .t{line-height:2.0}
  .qnote{font-size:12.5px;color:var(--ink3);line-height:1.65}

  /* ---------- 手写 ---------- */
  .hwgrid{display:flex;gap:10px;justify-content:center;margin:6px -6px 12px}
  .cellwrap{flex:1 1 0;min-width:0;text-align:center}
  .pytxt{font-size:13.5px;color:var(--orange-d);font-weight:600;margin-bottom:7px;
         font-family:"Times New Roman",Georgia,serif;letter-spacing:.02em}
  .cell{position:relative;aspect-ratio:1/1;border:1.5px solid #E7D8C2;border-radius:12px;
        background-color:#fff;overflow:hidden;
        background-image:
          linear-gradient(to right,transparent calc(50% - .5px),#F1E7D7 calc(50% - .5px),#F1E7D7 calc(50% + .5px),transparent calc(50% + .5px)),
          linear-gradient(to bottom,transparent calc(50% - .5px),#F1E7D7 calc(50% - .5px),#F1E7D7 calc(50% + .5px),transparent calc(50% + .5px))}
  .cell canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;
               -webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
  .hwline{position:relative;margin:0 0 26px;background:#fff;border:1.5px solid #E7D8C2;
          border-radius:14px;padding:8px;height:112px}
  .hwline canvas{display:block;width:100%;height:100%;touch-action:none;
                 -webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
  .hwl{position:absolute;left:11px;top:-10px;background:var(--cream);padding:0 7px;
       font-size:11.5px;color:var(--ink3);font-weight:700}
  .hwmark{font-size:12px;color:var(--ink3);margin-top:7px;min-height:16px;text-align:center;
          white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .hwline .hwmark{position:absolute;left:13px;bottom:-20px;margin:0;text-align:left}
  .hwmark.ok{color:var(--ok);font-weight:600}
  .hwmark.no{color:var(--bad);font-weight:600}
  .cellwrap.ok .cell,.hwline.ok,.hwgrid.ok .cell{border-color:var(--ok);box-shadow:0 0 0 3px rgba(46,156,124,.13)}
  .cellwrap.no .cell,.hwline.no,.hwgrid.no .cell{border-color:var(--bad);box-shadow:0 0 0 3px rgba(212,92,62,.12)}
  .hwclear{display:block;margin:16px auto 0;border:1px solid var(--line);background:#fff;
           color:var(--ink3);border-radius:99px;padding:8px 18px;font-size:13px;
           font-family:inherit;cursor:pointer}
  .btn.busy{pointer-events:none;opacity:.9}
  .btn.busy:after{content:"";width:14px;height:14px;border:2px solid rgba(255,255,255,.45);
                  border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}
  @keyframes spin{to{transform:rotate(360deg)}}

  /* ---------- 音频播放 ---------- */
  .ptime{font-size:12.5px;color:var(--ink3);margin-top:4px;font-variant-numeric:tabular-nums}
  .pbar{height:5px;background:#F3E2C8;border-radius:99px;margin:16px 0 2px;overflow:hidden}
  .pbar i{display:block;height:100%;width:0;border-radius:99px;
          background:linear-gradient(90deg,#FFB457,#F27000);transition:width .2s linear}
  .lines p.ln{cursor:pointer}
  .lines p.kid{color:#7C5A34}

  /* 班级固定展示 */
  .field input.locked{background:#F7EFE2;color:#6B5B48;font-weight:700;-webkit-text-fill-color:#6B5B48}

  /* 成绩页署名 */
  .who{text-align:center;font-size:13.5px;color:var(--ink3);margin-top:2px;letter-spacing:.02em}
  /* 教师端：最需回看标记 */
  .qrate .lab em{font-style:normal;font-size:11px;color:#C0492A;background:#FDEDE8;
                 padding:1px 6px;border-radius:99px;margin-left:6px;font-weight:600}