:root{
  --brand:#d1502e; --brand2:#b23f21; --ink:#2e2a23; --muted:#8a8172;
  --ok:#4a7c59; --bad:#c2401f; --line:#e2d8c3; --bg:#f5efe3; --card:#fffdf6;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  background-color:#f5efe3;
  background-image:repeating-linear-gradient(0deg,rgba(46,42,35,.03) 0 1px,transparent 1px 32px);
  color:var(--ink); min-height:100vh;
}
/* topbar */
.topbar{
  position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:8px;
  padding:12px 18px;background:rgba(255,255,255,.82);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);
}
.brand{font-weight:800;color:var(--brand);text-decoration:none;font-size:18px}
.brand-sep{color:var(--muted)}
.brand-cur{font-weight:600;font-size:15px}
.topnav{margin-left:auto;display:flex;gap:6px}
.topnav a{
  text-decoration:none;color:var(--ink);font-size:14px;padding:7px 14px;
  border-radius:20px;background:#fff;border:1px solid var(--line);
}
.topnav a.active{background:var(--brand);color:#fff;border-color:var(--brand)}
.stage{max-width:760px;margin:0 auto;padding:18px}
.view{display:none;animation:fade .25s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* steps */
.steps{display:flex;gap:8px;margin-bottom:18px;flex-wrap:wrap}
.step{font-size:13px;color:var(--muted);background:#fff;border:1px solid var(--line);
  padding:6px 12px;border-radius:20px}
.step.active{color:var(--brand);border-color:var(--brand);font-weight:600}
.pane-title{font-size:19px;margin:0 0 14px}
.pane-title small{color:var(--muted);font-weight:400;font-size:13px;margin-left:6px}

/* book grid */
.book-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.book-card{
  background:var(--card);border:1px solid var(--line);border-radius:16px;
  padding:18px;cursor:pointer;transition:.18s;text-align:left;position:relative;overflow:hidden;
}
.book-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(91,83,224,.12)}
.book-card .bc-grade{font-size:22px;font-weight:800}
.book-card .bc-sub{color:var(--muted);font-size:13px;margin-top:6px}
.book-card .bc-tag{display:inline-block;margin-top:10px;font-size:12px;color:var(--brand);
  background:rgba(91,83,224,.1);padding:3px 10px;border-radius:10px}
.book-card .bc-go{position:absolute;right:16px;top:16px;color:var(--brand);font-size:20px}

/* lesson list */
.lesson-tools,.word-tools{display:flex;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.muted{color:var(--muted);font-size:13px}
.lesson-list{max-height:46vh;overflow:auto;display:flex;flex-direction:column;gap:8px}
.lesson-item{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);
  border-radius:12px;padding:11px 14px;cursor:pointer}
.lesson-item .li-title{font-weight:600}
.lesson-item .li-meta{color:var(--muted);font-size:12px;margin-left:auto}
.lesson-item.sel{background:rgba(209,80,46,.1);border-color:var(--brand)}

/* buttons */
button{font-family:inherit;cursor:pointer;border:none}
.primary{background:var(--brand);color:#fff;padding:11px 22px;border-radius:12px;font-weight:600;font-size:15px}
.primary:hover{background:var(--brand2)}
.ghost{background:#fff;color:var(--ink);border:1px solid var(--line);padding:11px 20px;border-radius:12px;font-size:15px}
.mini{background:#fff;color:var(--brand);border:1px solid var(--brand);padding:7px 14px;border-radius:10px;font-size:13px}
.seg{display:inline-flex;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.seg-btn{background:#fff;color:var(--ink);padding:9px 16px;font-size:14px;border:none}
.seg-btn.active{background:var(--brand);color:#fff}
.pane-actions{display:flex;justify-content:space-between;gap:12px;margin-top:20px}
.pane-actions.center{justify-content:center}

/* word grid */
.word-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(84px,1fr));gap:10px;
  max-height:46vh;overflow:auto;padding:2px}
.word-chip{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 6px;text-align:center;
  cursor:pointer;transition:.15s;user-select:none
}
.word-chip .wc-text{font-size:22px;font-weight:700;line-height:1.1}
.word-chip .wc-py{font-size:11px;color:var(--muted);margin-top:4px}
.word-chip.sel{background:var(--brand);color:#fff;border-color:var(--brand)}
.word-chip.sel .wc-py{color:rgba(255,255,255,.8)}

/* dictation */
.dict-bar{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);
  border-radius:14px;padding:10px 14px;margin-bottom:14px}
.dict-progress{font-weight:700;font-size:16px}
.dict-progress span{color:var(--brand)}
.dict-mode{margin-left:auto;display:flex}
.dict-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:20px}
.dict-hint{font-size:18px;text-align:center;color:var(--ink);min-height:26px;font-weight:600}
.pad-wrap{position:relative;margin:16px 0;border-radius:14px;overflow:hidden;
  background:repeating-linear-gradient(0deg,var(--card),var(--card) 35px,#efe6d2 36px);
  border:1px dashed var(--brand)}
#pad{display:block;width:100%;height:auto;touch-action:none}
.pad-empty{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:#c9c7e0;font-size:18px;pointer-events:none}
.dict-controls{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.big{padding:13px 26px;border-radius:14px;font-size:16px;font-weight:700;background:#fff;
  border:1px solid var(--line);color:var(--ink)}
.big.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.big.ok{background:var(--ok);color:#fff;border-color:var(--ok)}
.big.bad{background:var(--bad);color:#fff;border-color:var(--bad)}
.check{margin-top:18px;border-top:1px dashed var(--line);padding-top:16px;text-align:center}
.check-answer{display:inline-flex;align-items:center;gap:14px;margin-bottom:14px}
.ans-char{font-size:64px;font-weight:800;color:var(--brand);
  width:96px;height:96px;line-height:96px;border-radius:18px;background:rgba(91,83,224,.08)}
.ans-meta{text-align:left}
.ans-meta #ans-pinyin{font-size:16px;font-weight:600}
.ans-meta #ans-phrases{display:block;margin-top:4px;font-size:13px}
.check-btns{display:flex;gap:12px;justify-content:center}

/* result */
.result-card,.wrong-head{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px}
.result-stats{display:flex;gap:12px;margin:18px 0}
.stat{flex:1;background:#f6f5fb;border-radius:14px;padding:16px;text-align:center}
.stat b{display:block;font-size:30px}
.stat.ok b{color:var(--ok)} .stat.bad b{color:var(--bad)}
.stat span{font-size:13px;color:var(--muted)}
.wrong-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}
.wrong-list .wl{background:rgba(232,84,63,.1);color:var(--bad);border-radius:10px;
  padding:8px 12px;font-size:16px;font-weight:600}

/* wrong book */
.wrong-book{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.wb-item{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);
  border-radius:14px;padding:12px 16px}
.wb-char{font-size:34px;font-weight:800;width:54px;text-align:center}
.wb-info{flex:1}
.wb-info .wb-py{color:var(--muted);font-size:13px}
.wb-stage{font-size:12px;margin-top:4px}
.wb-due{display:inline-block;background:var(--bad);color:#fff;padding:2px 9px;border-radius:8px;font-size:11px}
.wb-done{display:inline-block;background:rgba(43,182,115,.15);color:var(--ok);padding:2px 9px;border-radius:8px;font-size:11px}
.wb-review{background:var(--brand);color:#fff;border:none;padding:8px 14px;border-radius:10px;font-size:13px}
.wb-review:disabled{background:#dcdbea;color:#fff;cursor:default}
.review-plan{background:rgba(91,83,224,.08);border-radius:12px;padding:12px 16px;font-size:14px;margin-top:14px}
.demofoot{text-align:center;color:var(--muted);font-size:12px;padding:24px}
.empty{text-align:center;color:var(--muted);padding:40px 0}
@media(max-width:560px){
  .book-grid{grid-template-columns:1fr}
  .result-stats{flex-direction:column}
}