/* 自然拼读 · 第一版风格（米白纸感 / 墨黑按钮 / 小圆角卡片）
   课程页 → 字素页 → GPC 练习 → Decoding 解码 */
:root{
  --paper:#F4F2EC;
  --card:#FDFCF8;
  --line:#E7E3D8;
  --line2:#EFEBE1;
  --ink:#242220;
  --ink2:#4A463F;
  --muted:#8C877C;
  --muted2:#ADA79B;
  --hl:#F0E7CB;
  --shadow:0 1px 0 rgba(36,34,32,.03), 0 6px 18px rgba(36,34,32,.05);
  --r:16px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%}
body{background:var(--paper);color:var(--ink);
  font-family:Andika,"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;font-size:14px}
.app{max-width:720px;margin:0 auto;padding:14px 16px 28px;min-height:100%}
.loading{padding:80px 0;text-align:center;color:var(--muted)}
button{font-family:inherit;cursor:pointer}
.chev{font-size:16px;margin-left:4px;opacity:.75;line-height:1}

/* ---------- 通用 ---------- */
.pill{display:inline-flex;align-items:center;justify-content:center;background:var(--ink);color:#FBF9F4;
  border:none;border-radius:999px;padding:13px 26px;font-size:15px;font-weight:600;letter-spacing:.3px;
  box-shadow:0 8px 18px rgba(36,34,32,.16);transition:transform .12s,opacity .12s}
.pill:active{transform:translateY(1px);opacity:.92}
.pill.off{background:#DCD7CB;color:#9C968A;box-shadow:none}
.iconbtn{border:none;background:none;padding:0;width:30px;height:30px;display:grid;place-items:center;
  font-size:19px;color:var(--ink2);line-height:1;border-radius:8px}
.iconbtn:active{background:rgba(36,34,32,.06)}
.toast{position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(8px);opacity:0;
  background:rgba(36,34,32,.92);color:#FBF9F4;padding:10px 16px;border-radius:12px;font-size:12.5px;
  transition:opacity .18s,transform .18s;pointer-events:none;z-index:20;max-width:88%;text-align:center}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.fade{animation:fade .18s ease}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

/* ---------- 顶栏（课程页） ---------- */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:6px 0 14px}
.brand{font-size:15px;font-weight:600;letter-spacing:.2px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topright{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.badge{display:inline-flex;align-items:center;gap:6px;background:#FBF9F4;border:1px solid var(--line);
  border-radius:999px;padding:6px 12px;font-size:12px;color:var(--ink2)}
.badge i{width:5px;height:5px;border-radius:50%;background:var(--ink);display:inline-block}
.crumb{display:flex;align-items:center;justify-content:space-between;gap:10px;
  font-size:12px;color:var(--muted);padding:0 2px 12px}
.crumb .done{font-variant-numeric:tabular-nums}

/* ---------- 等级标签 ---------- */
.lvtabs{display:flex;gap:8px;overflow-x:auto;padding:2px 2px 14px;scrollbar-width:none;-ms-overflow-style:none}
.lvtabs::-webkit-scrollbar{display:none}
.lv{flex:0 0 auto;background:#FBF9F4;border:1px solid var(--line);border-radius:999px;
  padding:8px 14px;font-size:12.5px;color:var(--ink2);white-space:nowrap;line-height:1.2}
.lv i{font-style:normal;font-size:11.5px;opacity:.6;margin-left:3px}
.lv.on{background:var(--ink);border-color:var(--ink);color:#FBF9F4}
.lv.on i{opacity:.5}
.lv.on i{color:#CFC9BC}

/* ---------- 套卡 ---------- */
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.setcard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:13px 13px 11px;
  display:flex;flex-direction:column;gap:9px;box-shadow:var(--shadow);transition:transform .12s}
.setcard:active{transform:scale(.99)}
.tiles{display:flex;flex-wrap:wrap;gap:6px}
.tile{flex:1 1 0;min-width:0;height:38px;padding:0 4px;display:inline-flex;align-items:center;justify-content:center;
  background:#FFFDF7;border:1px solid var(--line);border-radius:9px;font-size:18px;color:var(--ink);line-height:1;overflow:hidden}
.tile.more{color:var(--muted);font-size:12px;background:none;border-style:dashed}
.ctitle{font-size:13.5px;color:var(--ink);line-height:1.35}
.cmeta{font-size:11.5px;color:var(--muted);line-height:1.5}
.cfoot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:2px}
.cdots{display:flex;gap:4px}
.cdots i{width:4px;height:4px;border-radius:50%;background:#E1DCD0}
.cdots i.on{background:var(--ink)}
.cgo{font-size:11.5px;color:var(--muted)}

/* ---------- 分段落进度 ---------- */
.segbar{display:flex;gap:5px;flex:1 1 auto;align-items:center}
.segbar i{flex:1 1 0;height:3px;border-radius:2px;background:#E2DED2}
.segbar i.on{background:var(--ink)}

/* ---------- 页面通用顶栏 ---------- */
.top{display:flex;align-items:center;gap:12px;padding:2px 0 10px}
.counter{font-size:11px;color:var(--muted2);letter-spacing:.3px;margin-left:auto;white-space:nowrap}

/* ---------- 字素页 ---------- */
.center{display:flex;flex-direction:column;align-items:center;justify-content:center;
  min-height:calc(100vh - 210px);gap:0;text-align:center}
.bigletter{font-size:118px;line-height:1.02;color:var(--ink);letter-spacing:-1px;cursor:pointer}
.ipa{font-size:17px;color:var(--muted);margin-top:2px}
.desc{font-size:12px;color:var(--muted);margin-top:10px;max-width:280px;line-height:1.6}
.exrow{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:20px;max-width:320px}
.expill{display:inline-flex;align-items:center;gap:7px;background:#FBF9F4;border:1px solid var(--line);
  border-radius:11px;padding:9px 13px;font-size:15px;color:var(--ink);line-height:1}
.expill:active{background:#F3EFE4}
.expill b{font-size:10px;color:var(--muted2);font-weight:400}
.bottom{display:flex;flex-direction:column;align-items:center;gap:8px;padding:18px 0 4px}
.bottom .pill{min-width:220px}
.tapdot{font-size:11px;color:var(--muted2);letter-spacing:.2px}

/* ---------- GPC / 解码 ---------- */
.body{display:flex;flex-direction:column;gap:14px;min-height:calc(100vh - 150px)}
.deckrow{display:flex;flex-direction:column;gap:7px}
.decklabel{font-size:11px;color:var(--muted);letter-spacing:.2px}
.deckcard{display:flex;gap:7px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:9px}
.deckcard .dc{flex:1 1 0;min-width:0;background:#FFFDF7;border:1px solid var(--line);border-radius:10px;
  padding:8px 2px;display:flex;flex-direction:column;align-items:center;gap:1px;color:var(--ink)}
.deckcard .dc:active{background:#F3EFE4}
.deckcard .dc .l{font-size:21px;line-height:1.15}
.deckcard .dc .i{font-size:9.5px;color:var(--muted2)}
.stagewrap{flex:1 1 auto;display:flex;flex-direction:column;justify-content:center}
.stage{display:flex;flex-direction:column;align-items:center;gap:16px;padding:4px 0 10px}
.wordimg{width:170px;height:120px;object-fit:cover;border-radius:14px;border:1px solid var(--line);background:#FFFDF7}
.wordbox{display:flex;flex-direction:column;align-items:center;gap:6px}
.wordrow{display:flex;align-items:center;gap:6px}
.slot{width:52px;height:62px;border:2px dashed #CFC9BA;border-radius:12px;background:#FFFDF7;
  display:inline-flex;align-items:center;justify-content:center;font-size:34px;color:var(--ink)}
.slot.filled{border:2px solid var(--ink);background:#FFFDF7}
.slot.bad{animation:shake .4s;border-color:#C98C74}
@keyframes shake{25%{transform:translateX(-4px)}50%{transform:translateX(4px)}75%{transform:translateX(-2px)}}
.ltr{font-size:38px;line-height:1.1}
.hintdrag{font-size:11.5px;color:var(--muted)}
.meaning{font-size:14px;color:var(--ink2)}
.player{display:flex;align-items:center;gap:9px;background:var(--card);border:1px solid var(--line);
  border-radius:999px;padding:8px 14px}
.pbtn{border:none;background:none;padding:0;font-size:11px;color:var(--ink);line-height:1}
.replay{font-size:11.5px;color:var(--muted);white-space:nowrap}
.track{flex:1 1 auto;height:3px;background:#E7E3D8;border-radius:2px;overflow:hidden;min-width:40px}
.track i{display:block;height:100%;width:0;background:var(--ink);border-radius:2px}
.speed{font-size:11px;color:var(--muted);min-width:30px;text-align:right}

/* ---------- 句子 ---------- */
.sentence{display:flex;flex-wrap:wrap;justify-content:center;align-items:flex-end;gap:3px 9px;
  font-size:27px;line-height:1.5;padding:2px 0 0;color:var(--ink)}
.sentence .w{display:inline-flex;flex-direction:column;align-items:center;padding:0 2px;border-radius:8px}
.sentence .w:active{background:#EFEBDF}
.sentence .wl{display:inline-flex;align-items:center;gap:3px}
.sentence .spk{width:11px;height:11px;color:#C6C0B2;flex:0 0 auto}
.sentence .hl{background:var(--hl);border-radius:5px;padding:0 2px;box-decoration-break:clone}
.sentence .hl.pulse{animation:hlp .9s}
@keyframes hlp{0%,100%{background:var(--hl)}40%{background:#E3D5A8}}
.wdots{display:flex;gap:2.5px;justify-content:center;margin-top:3px;min-height:5px}
.wdots i{width:4px;height:4px;border-radius:50%;background:#D8D3C6}
.zh{font-size:12.5px;color:var(--muted);margin-top:2px;text-align:center}

@media (max-width:360px){
  .grid{grid-template-columns:1fr}
  .bigletter{font-size:100px}
}