:root{
  --brand:#B5443A; --brand-d:#8E322A; --brand-l:#F3E2DF;
  --gold:#D99A3C; --gold-l:#FBEED8;
  --bg:#FAF7F2; --card:#FFFFFF; --ink:#26211E; --muted:#8A817A;
  --line:#ECE6DE; --ok:#3E8E5A;
  --tab-h:62px;
  --r:16px; --r-s:11px;
  --shadow:0 6px 22px rgba(70,45,30,.08);
  --shadow-s:0 2px 10px rgba(70,45,30,.06);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.55;
  -webkit-font-smoothing:antialiased; overscroll-behavior-y:none;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
img{max-width:100%;display:block}

/* ---------- topbar ---------- */
.topbar{
  position:sticky; top:0; z-index:40;
  height:52px; display:flex; align-items:center; gap:8px; padding:0 12px;
  background:rgba(250,247,242,.92); backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar-title{font-weight:700;font-size:16.5px;flex:1;text-align:center;letter-spacing:.02em}
.topbar-back,.topbar-act{
  width:36px;height:36px;border-radius:10px;font-size:22px;line-height:1;
  display:flex;align-items:center;justify-content:center;color:var(--brand);
}
.topbar-back:active,.topbar-act:active{background:var(--brand-l)}
.topbar-act{font-size:18px}

/* ---------- view ---------- */
.view{
  max-width:540px; margin:0 auto; padding:14px 14px calc(var(--tab-h) + 26px);
  min-height:calc(100vh - 52px);
}
.view.nopad{padding:0 0 calc(var(--tab-h) + 20px)}

/* ---------- hero ---------- */
.hero{
  background:linear-gradient(140deg,var(--brand),#C65A44 60%,var(--gold));
  color:#fff; border-radius:20px; padding:20px 18px 18px; position:relative; overflow:hidden;
  box-shadow:var(--shadow);
}
.hero:after{content:"汉";position:absolute;right:-14px;bottom:-30px;font-size:130px;opacity:.13;font-weight:700}
.hero h1{margin:0 0 4px;font-size:21px;letter-spacing:.02em}
.hero p{margin:0;font-size:13px;opacity:.92}
.hero .chips{margin-top:12px;display:flex;gap:8px;flex-wrap:wrap}
.hero .chip{background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.35);color:#fff;
  font-size:12px;padding:4px 10px;border-radius:999px}

/* ---------- section title ---------- */
.sec-title{display:flex;align-items:baseline;gap:8px;margin:22px 4px 10px}
.sec-title h2{margin:0;font-size:15.5px;letter-spacing:.02em}
.sec-title span{font-size:12px;color:var(--muted)}

/* ---------- special cards ---------- */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:11px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.special{
  background:var(--card);border-radius:var(--r);padding:14px;box-shadow:var(--shadow-s);
  border:1px solid var(--line);text-align:left;display:flex;gap:11px;align-items:center;
}
.special.col{flex-direction:column;align-items:center;text-align:center;gap:8px;padding:15px 8px}
.special.col .ic{width:44px;height:44px}
.special:active{transform:scale(.98)}
.special .ic{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;flex:0 0 auto}
.special .ic.blue{background:#E7EEF6;color:#3A6EA5}
.special .ic.gold{background:var(--gold-l);color:var(--gold)}
.special .ic.green{background:#E4F1E7;color:#3E8E5A}
.special b{display:block;font-size:14px}
.special small{color:var(--muted);font-size:11.5px;line-height:1.35;display:block}

/* ---------- lesson list ---------- */
.lesson{
  background:var(--card);border-radius:var(--r);padding:13px 14px;margin-bottom:10px;
  box-shadow:var(--shadow-s);border:1px solid var(--line);
  display:flex;align-items:center;gap:12px;width:100%;text-align:left;
}
.lesson:active{transform:scale(.99)}
.lesson .no{
  width:38px;height:38px;border-radius:11px;background:var(--brand-l);color:var(--brand-d);
  font-weight:700;display:flex;align-items:center;justify-content:center;font-size:15px;flex:0 0 auto
}
.lesson .mid{flex:1;min-width:0}
.lesson .mid b{font-size:15px}
.lesson .mid small{display:block;color:var(--muted);font-size:11.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lesson .st{font-size:11px;color:var(--muted);flex:0 0 auto}
.lesson .st.done{color:var(--ok);font-weight:600}
.progressbar{height:6px;background:var(--line);border-radius:99px;overflow:hidden;margin-top:7px}
.progressbar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--gold));border-radius:99px}

/* ---------- lesson header ---------- */
.lhead{padding:18px 4px 6px}
.lhead .k{font-size:12px;color:var(--brand);font-weight:700;letter-spacing:.08em}
.lhead h1{margin:4px 0 2px;font-size:23px}
.lhead p{margin:0;color:var(--muted);font-size:13px}
.gh-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:13px 14px;margin:10px 0;box-shadow:var(--shadow-s)
}
.gh-card .tag{display:inline-block;font-size:11px;background:var(--gold-l);color:#9A6A18;
  padding:2px 8px;border-radius:99px;margin-bottom:6px;font-weight:600}
.gh-card b{display:block;font-size:14.5px;margin-bottom:3px}
.gh-card p{margin:0 0 6px;font-size:13px;color:#5B544E}
.gh-card .exs{display:flex;flex-direction:column;gap:3px}
.gh-card .exs button{text-align:left;font-size:13.5px;color:var(--brand-d);display:flex;gap:6px;align-items:center}
.gh-card .exs button:before{content:"🔊";font-size:11px;opacity:.7}

/* ---------- word row ---------- */
.word{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:11px 13px;margin-bottom:9px;display:flex;align-items:center;gap:12px;
  box-shadow:var(--shadow-s);width:100%;text-align:left
}
.word:active{transform:scale(.99)}
.word .hz{font-size:25px;font-weight:600;letter-spacing:.02em;min-width:66px}
.word .info{flex:1;min-width:0}
.word .py{color:var(--brand);font-size:13.5px;font-weight:600}
.word .en{color:var(--muted);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.word .lk{width:32px;height:32px;border-radius:50%;background:#F2EEE8;display:flex;
  align-items:center;justify-content:center;font-size:14px;color:var(--brand);flex:0 0 auto}

/* ---------- bottom sheet (word detail) ---------- */
.sheet-mask{position:fixed;inset:0;background:rgba(40,28,20,.42);z-index:60;animation:fade .18s}
@keyframes fade{from{opacity:0}}
.sheet{
  position:fixed;left:0;right:0;bottom:0;z-index:61;margin:0 auto;max-width:540px;
  background:var(--card);border-radius:22px 22px 0 0;padding:8px 18px calc(20px + env(safe-area-inset-bottom));
  max-height:92vh;overflow-y:auto;animation:up .26s cubic-bezier(.2,.8,.25,1);
  box-shadow:0 -8px 30px rgba(50,30,20,.18)
}
@keyframes up{from{transform:translateY(100%)}}
.sheet .handle{width:40px;height:4px;border-radius:99px;background:var(--line);margin:6px auto 12px}
.sheet .top{display:flex;gap:16px;align-items:flex-start}
.sheet .hanzibox{width:132px;height:132px;flex:0 0 auto;background:#FCFAF7;border:1px solid var(--line);border-radius:14px;position:relative}
.sheet .hanzibox .grid-bg{position:absolute;inset:0;border-radius:14px;pointer-events:none}
.sheet .hmeta{flex:1;min-width:0}
.sheet .hmeta .py{font-size:19px;color:var(--brand);font-weight:700}
.sheet .hmeta .pos{display:inline-block;font-size:11px;background:var(--brand-l);color:var(--brand-d);padding:2px 8px;border-radius:99px;margin-left:6px;vertical-align:middle}
.sheet .hmeta .en{font-size:14px;color:#5B544E;margin-top:6px}
.sheet .hmeta .enrow{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.sheet .wbtn{display:flex;gap:9px;flex-wrap:wrap;margin-top:12px}
.btn{border-radius:11px;padding:9px 13px;font-size:13px;font-weight:600;display:inline-flex;align-items:center;gap:6px}
.btn.primary{background:var(--brand);color:#fff}
.btn.ghost{background:#F3EFE9;color:var(--ink)}
.btn.ghost.on{background:var(--gold-l);color:#9A6A18}
.btn:active{transform:scale(.97)}
.note{background:#FBF6EF;border:1px dashed #E7D8C4;border-radius:12px;padding:11px 12px;margin-top:14px;font-size:13.5px;color:#5B544E}
.note b{color:var(--brand-d)}
.ex-block{margin-top:14px}
.ex-block .lb{font-size:11.5px;color:var(--muted);letter-spacing:.06em;margin-bottom:6px}
.ex-block .zh{font-size:18px;font-weight:600;display:flex;align-items:center;gap:8px}
.ex-block .zh button{width:28px;height:28px;border-radius:50%;background:var(--brand-l);color:var(--brand-d);font-size:13px;display:flex;align-items:center;justify-content:center}
.ex-block .py{color:var(--brand);font-size:13.5px;margin-top:4px}
.ex-block .en{color:var(--muted);font-size:13px;margin-top:2px;font-style:italic}
.sheet .nav{display:flex;gap:10px;margin-top:18px}
.sheet .nav .btn{flex:1;justify-content:center}

/* ---------- pinyin ---------- */
.seg{display:flex;background:#F1ECE5;border-radius:12px;padding:4px;gap:4px;margin:12px 0 16px;
  overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.seg::-webkit-scrollbar{display:none}
.seg button{flex:1 0 auto;min-width:56px;padding:8px 10px;border-radius:9px;font-size:13px;font-weight:600;color:var(--muted);white-space:nowrap}
.seg button.on{background:#fff;color:var(--brand-d);box-shadow:var(--shadow-s)}

/* 田字格辅助线 */
.grid-bg{pointer-events:none;background:
  linear-gradient(to right,transparent calc(50% - 1px),#EAD3CD calc(50% - 1px) calc(50% + 1px),transparent calc(50% + 1px)),
  linear-gradient(to bottom,transparent calc(50% - 1px),#EAD3CD calc(50% - 1px) calc(50% + 1px),transparent calc(50% + 1px));
  opacity:.9}
.hzfallback{width:100%;height:100%;display:flex;align-items:center;justify-content:center;
  font-size:64px;font-weight:600;color:var(--brand-d)}
.hanzibox{position:relative;overflow:hidden}
.hanzibox svg{position:relative;z-index:1}
.fc .fc-back-none{display:none}
.tile-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(72px,1fr));gap:9px}
.tile{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 6px;
  text-align:center;box-shadow:var(--shadow-s)}
.tile:active{transform:scale(.96);background:var(--brand-l)}
.tile b{font-size:20px;color:var(--brand-d);font-weight:700}
.tile small{display:block;color:var(--muted);font-size:10.5px;margin-top:2px}
.tone-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:13px 14px;margin-bottom:10px;box-shadow:var(--shadow-s);display:flex;gap:14px;align-items:center}
.tone-card .big{font-size:34px;color:var(--brand);font-weight:700;width:54px;text-align:center}
.tone-card .t b{font-size:14px}
.tone-card .t p{margin:2px 0 0;font-size:12.5px;color:var(--muted)}
.info-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px;margin-bottom:11px;box-shadow:var(--shadow-s)}
.info-card b{display:block;font-size:14.5px;margin-bottom:4px}
.info-card p{margin:0;font-size:13.5px;color:#5B544E}

/* ---------- strokes ---------- */
.stroke-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:13px 14px;margin-bottom:10px;box-shadow:var(--shadow-s);display:flex;gap:14px;align-items:center}
.stroke-card .glyph{font-size:30px;font-weight:600;width:56px;height:56px;display:flex;align-items:center;justify-content:center;background:#FCFAF7;border:1px solid var(--line);border-radius:12px}
.stroke-card .b b{font-size:15px}
.stroke-card .b .py{color:var(--brand);font-size:12.5px;font-weight:600;margin-left:6px}
.stroke-card .b p{margin:3px 0 0;font-size:12.5px;color:var(--muted)}

/* ---------- flashcards ---------- */
.fc-stage{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;gap:16px}
.fc{width:min(86vw,340px);height:min(56vh,420px);background:var(--card);border:1px solid var(--line);
  border-radius:24px;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:24px;text-align:center;cursor:pointer;position:relative;user-select:none;transition:transform .18s}
.fc:active{transform:scale(.98)}
.fc .hz{font-size:64px;font-weight:600;letter-spacing:.04em}
.fc .hint{position:absolute;bottom:16px;font-size:12px;color:var(--muted)}
.fc .back .py{font-size:26px;color:var(--brand);font-weight:700}
.fc .back .en{font-size:17px;margin-top:10px;color:#5B544E}
.fc .back .ex{margin-top:14px;font-size:14px;color:var(--muted)}
.fc .tone{position:absolute;top:14px;left:16px;font-size:11px;background:var(--brand-l);color:var(--brand-d);padding:2px 9px;border-radius:99px;font-weight:600}
.fc-bar{display:flex;gap:10px;align-items:center}
.fc-bar .btn{min-width:78px;justify-content:center}
.fc-count{font-size:12.5px;color:var(--muted);font-variant-numeric:tabular-nums}

/* ---------- quiz ---------- */
.quiz-q{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px 16px;text-align:center;box-shadow:var(--shadow-s);margin-bottom:14px}
.quiz-q .hz{font-size:52px;font-weight:600}
.quiz-q .py{color:var(--brand);font-size:19px;font-weight:700;margin-top:8px}
.quiz-q small{color:var(--muted);font-size:12px}
.opt{display:block;width:100%;text-align:left;background:var(--card);border:1.5px solid var(--line);
  border-radius:13px;padding:14px 15px;font-size:14.5px;margin-bottom:9px;box-shadow:var(--shadow-s)}
.opt:active{transform:scale(.99)}
.opt.right{border-color:var(--ok);background:#EDF7F0;color:#26603C;font-weight:600}
.opt.wrong{border-color:#C0574C;background:#FBECEA;color:#963128}
.opt[disabled]{opacity:.92}

/* ---------- me ---------- */
.stat-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin:6px 0 4px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 8px;text-align:center;box-shadow:var(--shadow-s)}
.stat b{display:block;font-size:22px;color:var(--brand)}
.stat small{color:var(--muted);font-size:11.5px}
.list-item{background:var(--card);border:1px solid var(--line);border-radius:13px;padding:14px;margin-bottom:9px;
  display:flex;align-items:center;gap:11px;width:100%;text-align:left;box-shadow:var(--shadow-s);font-size:14.5px}
.list-item .ic{width:34px;height:34px;border-radius:10px;background:#F1ECE5;display:flex;align-items:center;justify-content:center;font-size:17px}
.list-item .arw{margin-left:auto;color:var(--muted)}
.foot{text-align:center;color:var(--muted);font-size:11.5px;margin:22px 0 6px;line-height:1.7}

/* ---------- tabbar ---------- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:50;height:calc(var(--tab-h) + env(safe-area-inset-bottom));
  padding-bottom:env(safe-area-inset-bottom);
  background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-top:1px solid var(--line);
  display:flex;max-width:540px;margin:0 auto
}
.tab{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--muted)}
.tab span{font-size:20px;line-height:1;filter:grayscale(1) opacity(.6)}
.tab i{font-style:normal;font-size:10.5px}
.tab.is-on{color:var(--brand)}
.tab.is-on span{filter:none}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:calc(var(--tab-h) + 26px);transform:translateX(-50%);z-index:90;
  background:rgba(38,33,30,.92);color:#fff;font-size:13px;padding:10px 16px;border-radius:99px;
  max-width:80vw;text-align:center;animation:fade .2s
}

/* empty */
.empty{text-align:center;color:var(--muted);font-size:13.5px;padding:40px 10px}
.spin{width:34px;height:34px;border:3px solid var(--line);border-top-color:var(--brand);border-radius:50%;margin:26px auto;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
@media (min-width:600px){
  body{background:#F3EEE7}
  .view, .tabbar{background:var(--bg)}
}