:root{
  --red:#d23b2e; --red-d:#a82a20; --gold:#f4b400; --ink:#22303c; --paper:#fff8f0;
  --green:#2e9e5b; --green-l:#e6f6ec; --wrong:#d23b2e; --wrong-l:#fde9e7;
  --card:#ffffff; --line:#eadfce; --muted:#8a7d6c;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC","Heiti SC",sans-serif;
  background:var(--paper); color:var(--ink); line-height:1.7;
  max-width:680px;margin:0 auto;min-height:100vh;
}
.hidden{display:none!important}
button{font-family:inherit;cursor:pointer;border:none}

/* 顶栏 */
.topbar{position:sticky;top:0;z-index:5;background:var(--red);color:#fff;
  display:flex;align-items:center;justify-content:space-between;padding:12px 16px;
  box-shadow:0 2px 8px rgba(0,0,0,.12)}
.topbar .brand{font-size:20px;font-weight:800;letter-spacing:1px}
.stats{display:flex;gap:14px;font-size:14px;font-weight:700}
.stats .pill{background:rgba(255,255,255,.18);padding:3px 10px;border-radius:20px}

/* 主页 */
.wrap{padding:16px}
.levelcard{background:linear-gradient(135deg,#fff,#fff3e0);border:1px solid var(--line);
  border-radius:18px;padding:18px;margin-bottom:18px;box-shadow:0 4px 14px rgba(180,120,30,.08)}
.levelcard .lvlname{font-size:22px;font-weight:800;color:var(--red-d)}
.levelcard .sub{color:var(--muted);font-size:14px;margin-top:2px}
.bar{height:14px;background:#f0e6d6;border-radius:10px;overflow:hidden;margin-top:12px}
.bar > i{display:block;height:100%;background:linear-gradient(90deg,var(--gold),#ff8a3d);border-radius:10px;transition:width .6s}
.badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.badge{font-size:13px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:4px 10px}
.badge.lock{opacity:.35}

.sectitle{font-size:17px;font-weight:800;margin:6px 2px 12px}
.lesson{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);
  border-radius:16px;padding:16px;margin-bottom:12px;box-shadow:0 2px 8px rgba(0,0,0,.04);
  transition:transform .12s}
.lesson:active{transform:scale(.985)}
.lesson .num{width:44px;height:44px;flex:none;border-radius:50%;background:var(--red);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px}
.lesson .done .num,.lesson.done .num{background:var(--green)}
.lesson .t{font-weight:800;font-size:18px}
.lesson .tag{color:var(--muted);font-size:13px}
.lesson .go{margin-left:auto;color:var(--red);font-weight:800;font-size:22px}

/* 课程进度条（步骤）*/
.steps{display:flex;gap:6px;padding:14px 16px}
.steps > i{flex:1;height:8px;background:#eadfce;border-radius:6px}
.steps > i.on{background:var(--gold)}
.steps > i.ok{background:var(--green)}

.stepwrap{padding:8px 16px 120px}
.steplabel{font-size:14px;color:var(--muted);font-weight:700;margin-bottom:6px}
.h{font-size:22px;font-weight:800;margin:2px 0 14px}

/* 阅读 */
.passage{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;font-size:21px}
.passage .s{margin-bottom:14px}
.passage .py{display:block;color:var(--red);font-size:14px;margin-bottom:2px}
.passage .py.hidden{display:none}
.passage .vw{color:var(--red-d);border-bottom:2px dotted var(--gold);cursor:pointer}
.passage .spk{cursor:pointer}
.toolrow{display:flex;gap:10px;margin:14px 0}
.tbtn{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 14px;font-weight:700;font-size:15px}
.tbtn.active{background:var(--gold);color:#3a2c00;border-color:var(--gold)}

/* 朗读 */
.bigsent{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;font-size:24px;text-align:center}
.micbtn{display:block;margin:20px auto;width:90px;height:90px;border-radius:50%;background:var(--red);color:#fff;font-size:34px;box-shadow:0 6px 16px rgba(210,59,46,.35)}
.micbtn.rec{animation:pulse 1s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(210,59,46,.5)}100%{box-shadow:0 0 0 22px rgba(210,59,46,0)}}
.scorebox{text-align:center;font-size:18px;margin-top:8px;min-height:28px}
.scorebox .pct{font-size:40px;font-weight:800}

/* 选择 / 填空 */
.q{font-size:21px;font-weight:700;margin-bottom:16px}
.opt{display:block;width:100%;text-align:left;background:#fff;border:2px solid var(--line);
  border-radius:14px;padding:15px 16px;margin-bottom:12px;font-size:19px;font-weight:600}
.opt.correct{background:var(--green-l);border-color:var(--green);color:var(--green)}
.opt.wrong{background:var(--wrong-l);border-color:var(--wrong);color:var(--wrong)}
.opt:disabled{opacity:.9}

/* 底部主按钮 */
.footbar{position:fixed;left:0;right:0;bottom:0;max-width:680px;margin:0 auto;
  padding:14px 16px;background:linear-gradient(transparent,var(--paper) 30%)}
.primary{display:block;width:100%;background:var(--green);color:#fff;font-size:19px;font-weight:800;
  border-radius:14px;padding:16px;box-shadow:0 4px 12px rgba(46,158,91,.3)}
.primary:disabled{background:#c8c0b4;box-shadow:none}
.primary.red{background:var(--red);box-shadow:0 4px 12px rgba(210,59,46,.3)}

/* 完成页 */
.finish{text-align:center;padding:40px 20px}
.finish .big{font-size:64px}
.finish h2{font-size:26px;margin:8px 0}
.gain{font-size:20px;color:var(--green);font-weight:800}
.newbadge{display:inline-block;background:#fff;border:1px solid var(--gold);border-radius:16px;
  padding:10px 14px;margin:6px;font-weight:700}

.toast{position:fixed;left:50%;bottom:96px;transform:translateX(-50%);background:var(--ink);color:#fff;
  padding:10px 16px;border-radius:24px;font-size:15px;z-index:30;opacity:0;transition:opacity .25s}
.toast.show{opacity:1}
.note{color:var(--muted);font-size:13px;text-align:center;margin-top:8px}
.pop{position:fixed;inset:0;background:rgba(0,0,0,.35);display:flex;align-items:center;justify-content:center;z-index:40;padding:24px}
.pop .card{background:#fff;border-radius:18px;padding:22px;max-width:360px;text-align:center}
.pop .word{font-size:30px;font-weight:800;color:var(--red-d)}
.pop .pyt{color:var(--red);margin:4px 0 8px}
.pop .def{font-size:18px}
.pop button{margin-top:16px;background:var(--red);color:#fff;border-radius:12px;padding:10px 20px;font-weight:700}