:root{
  --bg:#f7f4ef; --card:#ffffff; --ink:#22201d; --muted:#7d766c;
  --line:#e9e3d9; --accent:#1f6f5c; --accent-soft:#e4efe9;
  --warm:#c2703d; --warm-soft:#f7ece3; --ok:#2f7d4f; --bad:#b64a3c;
  --r:18px; --r-sm:12px;
  --shadow:0 1px 2px rgba(34,32,29,.05), 0 8px 24px rgba(34,32,29,.06);
  --mono:"Segoe UI","Lucida Sans Unicode","Noto Sans",system-ui,sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:16px; line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
h1,h2,h3,p{margin:0}

#app{max-width:720px;margin:0 auto;padding:0 16px 104px}

/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:20;margin:0 -16px;padding:14px 16px 10px;
  display:flex;align-items:center;gap:10px;
  background:linear-gradient(var(--bg) 72%,rgba(247,244,239,0));
}
.topbar h1{font-size:19px;font-weight:650;letter-spacing:.2px}
.topbar .spacer{flex:1}
.back{
  width:38px;height:38px;border-radius:50%;display:grid;place-items:center;
  background:var(--card);box-shadow:var(--shadow);font-size:17px;flex:none;
}
.icon-btn{
  width:38px;height:38px;border-radius:50%;display:grid;place-items:center;
  background:var(--card);box-shadow:var(--shadow);font-size:16px;flex:none;
}

/* ---------- generic ---------- */
.section{margin-top:26px}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:10px}
.section-head h2{font-size:15px;font-weight:650;letter-spacing:.3px}
.section-head .more{font-size:13px;color:var(--muted)}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:18px}
.muted{color:var(--muted)}
.small{font-size:13px}
.tiny{font-size:11.5px}
.center{text-align:center}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 18px;border-radius:999px;background:var(--card);
  box-shadow:var(--shadow);font-weight:600;font-size:15px;
  transition:transform .12s ease, opacity .12s ease;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(31,111,92,.25)}
.btn-warm{background:var(--warm);color:#fff}
.btn-ghost{background:transparent;box-shadow:none;color:var(--muted);font-weight:500}
.btn-block{display:flex;width:100%}
.btn-lg{padding:16px 20px;font-size:16px;border-radius:16px}
.btn[disabled]{opacity:.45;pointer-events:none}
.row{display:flex;gap:10px}
.row > *{flex:1}

/* ---------- hero / path ---------- */
.hero{
  margin-top:14px;border-radius:26px;padding:22px;
  background:linear-gradient(145deg,#24614f,#1b4a3d);color:#f3efe7;
  box-shadow:0 14px 34px rgba(28,74,61,.22);
}
.hero .date{font-size:12.5px;opacity:.72;letter-spacing:.6px}
.hero h2{font-size:23px;margin-top:6px;font-weight:650;line-height:1.35}
.hero p{font-size:13.5px;opacity:.8;margin-top:6px}
.hero-stats{display:flex;gap:18px;margin-top:18px}
.hero-stats div{font-size:11.5px;opacity:.72}
.hero-stats b{display:block;font-size:22px;font-weight:650;opacity:1;color:#fff}

.hero-cta{display:flex;align-items:center;gap:16px;margin-top:20px}
.hero-btn{
  display:inline-flex;align-items:center;gap:6px;background:#fff;color:#1b4a3d;
  padding:13px 22px;border-radius:999px;font-weight:650;font-size:15px;
  box-shadow:0 6px 18px rgba(0,0,0,.22);transition:transform .12s ease;
}
.hero-btn:active{transform:scale(.97)}
.hero-link{color:rgba(255,255,255,.85);font-size:13.5px;border-bottom:1px solid rgba(255,255,255,.4);padding-bottom:1px}

.chev{color:#c3bbae;font-size:22px;line-height:1;flex:none;margin-left:-2px}

.play.speaking,.speak-big.speaking{animation:pulse .55s ease}
@keyframes pulse{0%{transform:scale(1)}40%{transform:scale(1.14)}100%{transform:scale(1)}}

.path{display:flex;flex-direction:column;gap:2px}
.step{
  display:flex;align-items:center;gap:14px;padding:14px 4px;
  border-bottom:1px solid var(--line);
}
.step:last-child{border-bottom:0}
.step .num{
  width:28px;height:28px;border-radius:50%;display:grid;place-items:center;
  font-size:12.5px;font-weight:700;background:var(--bg);color:var(--muted);flex:none;
}
.step.done .num{background:var(--accent-soft);color:var(--accent)}
.step .t{flex:1}
.step .t b{display:block;font-size:14.5px;font-weight:600}
.step .t span{font-size:12.5px;color:var(--muted)}
.step .go{font-size:13px;color:var(--accent);font-weight:600}
.step.locked{opacity:.55}

/* ---------- today ---------- */
.today-card{margin-top:12px;padding:16px 18px 14px}
.today-title{font-size:16px;font-weight:650}
.today-row{display:flex;gap:26px;margin:12px 0 14px}
.today-row div{display:flex;flex-direction:column}
.today-row b{font-size:26px;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums}
.today-row span{font-size:11.5px;color:var(--muted);margin-top:2px}

/* ---------- listen ---------- */
.listen-box{text-align:center;padding:22px 0 6px}
.listen-play{
  width:92px;height:92px;border-radius:50%;background:var(--accent);color:#fff;
  font-size:34px;display:inline-flex;align-items:center;justify-content:center;
  box-shadow:0 10px 26px rgba(31,111,92,.3);transition:transform .12s ease;
}
.listen-play:active{transform:scale(.94)}
.listen-play.speaking{animation:pulse .55s ease}

/* ---------- streak ---------- */
.streak-card{margin-top:12px;padding:16px 18px}
.streak-num{font-size:24px;font-weight:700;color:var(--warm);letter-spacing:-.5px}
.streak-num small{font-size:12px;font-weight:500;color:var(--muted);margin-left:4px;letter-spacing:0}

/* ---------- progress ---------- */
.bar{height:6px;border-radius:99px;background:var(--line);overflow:hidden}
.bar > i{display:block;height:100%;border-radius:99px;background:var(--accent);transition:width .4s ease}
.bar.warm > i{background:var(--warm)}

/* ---------- group list ---------- */
.group{
  display:flex;align-items:center;gap:14px;padding:16px 18px;margin-bottom:10px;
  background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);
}
.group .g-ico{
  width:42px;height:42px;border-radius:13px;display:grid;place-items:center;
  background:var(--accent-soft);font-size:20px;flex:none;
}
.group .g-main{flex:1;min-width:0}
.group .g-main b{font-size:15px;font-weight:600;display:flex;align-items:center;gap:8px}
.group .g-main span{font-size:12.5px;color:var(--muted);display:block;margin-top:2px}
.group .g-num{font-size:12.5px;color:var(--muted);text-align:right;flex:none}
.group .bar{margin-top:9px}

/* ---------- IPA grid ---------- */
.seg{
  display:flex;gap:4px;padding:4px;background:#efe9df;border-radius:999px;margin:16px 0 18px;
}
.seg button{
  flex:1;padding:9px 10px;border-radius:999px;font-size:13.5px;font-weight:600;color:var(--muted);
}
.seg button.on{background:var(--card);color:var(--ink);box-shadow:0 1px 4px rgba(0,0,0,.08)}

.ipa-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
@media(max-width:420px){.ipa-grid{grid-template-columns:repeat(3,1fr)}}
.ph{
  background:var(--card);border-radius:14px;box-shadow:var(--shadow);
  padding:12px 6px 10px;text-align:center;position:relative;
}
.ph .sym{font-family:var(--mono);font-size:22px;font-weight:600;letter-spacing:.5px}
.ph .word{font-size:11.5px;color:var(--muted);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ph.seen::after{
  content:"";position:absolute;top:8px;right:8px;width:6px;height:6px;border-radius:50%;
  background:var(--accent);
}
.ph.big .sym{font-size:54px}
.ph.big .sym .lm{
  display:inline-block;position:relative;width:.30em;height:.60em;
  margin-left:.10em;vertical-align:baseline;letter-spacing:0;
}
.ph.big .sym .lm::before,.ph.big .sym .lm::after{
  content:"";position:absolute;left:0;width:.14em;height:.14em;
  border-radius:50%;background:currentColor;
}
.ph.big .sym .lm::before{top:.02em}
.ph.big .sym .lm::after{top:.26em}
.ph.big{padding:26px 10px 20px;border-radius:22px}

/* ---------- category grid ---------- */
.cats{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.cat{
  position:relative;display:flex;flex-direction:column;
  background:var(--card);border-radius:18px;padding:15px 15px 13px;
  box-shadow:var(--shadow);min-height:118px;
}
.cat:active{transform:scale(.985)}
.cat .ci{font-size:24px;line-height:1}
.cat b{font-size:16.5px;font-weight:650;margin-top:8px}
.cat span{font-size:11.5px;color:var(--muted);line-height:1.45;margin-top:3px}
.cat .bar{margin-top:auto;margin-bottom:0}
.cat-n{position:absolute;right:14px;top:16px;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}
.cat-tag{
  position:absolute;right:12px;top:14px;font-size:10.5px;color:var(--warm);
  background:var(--warm-soft);padding:2px 8px;border-radius:999px;
}
.cat.planned{box-shadow:none;background:#f1ece4;opacity:.75}
.cat.planned b{color:#6f6860}

/* ---------- word list ---------- */
.wlist{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden}
.wrow{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line)}
.wrow:last-child{border-bottom:0}
.wrow .w-main{flex:1;min-width:0}
.wrow .w-en{font-weight:600;font-size:15.5px}
.wrow .w-en .ip{font-family:var(--mono);font-weight:400;font-size:13px;color:#6a635a;margin-left:7px}
.wrow .w-zh{font-size:12.5px;color:var(--muted)}
.wrow .dot{width:7px;height:7px;border-radius:50%;background:var(--line);flex:none}
.wrow .dot.learn{background:var(--warm)}
.wrow .dot.done{background:var(--accent)}
.play{
  width:34px;height:34px;border-radius:50%;display:grid;place-items:center;
  background:var(--accent-soft);color:var(--accent);font-size:14px;flex:none;
}
.play.sm{width:30px;height:30px;font-size:13px}

/* ---------- flashcard ---------- */
.flashwrap{margin-top:18px}
.face{
  width:100%;flex:none;
  background:var(--card);border-radius:24px;box-shadow:var(--shadow);
  padding:28px 22px;min-height:330px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;
}
.face.back{display:none;justify-content:center;gap:6px}
.flashcard.flipped .face.front{display:none}
.flashcard.flipped .face.back{display:flex;animation:fade .2s ease both}
.face .pos{font-size:11.5px;letter-spacing:1px;color:var(--muted);text-transform:uppercase}
.face .word{font-size:40px;font-weight:650;letter-spacing:-.5px;margin:6px 0 2px;line-height:1.15}
.face .ipa{font-family:var(--mono);color:#4d4740;font-size:18px;margin-top:2px}
.face.back .ipa{margin-bottom:6px}
.face .zh{font-size:26px;font-weight:600;margin-bottom:4px}
.face .colloc{font-size:14px;color:var(--warm);margin-top:6px}
.face .ex{font-size:15px;margin-top:14px;line-height:1.5}
.face .ex-zh{font-size:13px;color:var(--muted)}
.face .note{font-size:12.5px;color:var(--muted);background:var(--bg);border-radius:10px;padding:8px 12px;margin-top:14px;max-width:100%}
.hint{font-size:12.5px;color:var(--muted);margin-top:22px}

.grades{display:flex;gap:10px;margin-top:16px}
.grades .btn{flex:1;border-radius:14px;padding:15px 8px;font-size:14.5px}
.g-again{background:#f8e6e2;color:var(--bad)}
.g-hard{background:#f9efe1;color:#9a6b2f}
.g-good{background:var(--accent);color:#fff}

.qprog{display:flex;align-items:center;gap:12px;margin-top:16px}
.qprog .bar{flex:1}
.qprog span{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}

/* ---------- quiz ---------- */
.qword{font-size:30px;font-weight:650;text-align:center;margin:30px 0 6px}
.qsub{text-align:center;color:var(--muted);font-size:13px}
.opts{display:flex;flex-direction:column;gap:10px;margin-top:26px}
.opt{
  padding:16px 18px;border-radius:14px;background:var(--card);box-shadow:var(--shadow);
  font-size:16px;text-align:left;display:flex;align-items:center;gap:10px;
  transition:transform .1s ease;
}
.opt:active{transform:scale(.985)}
.opt.right{background:#e7f2ea;box-shadow:inset 0 0 0 1.5px var(--ok);color:#1e5a38}
.opt.wrong{background:#fbeae6;box-shadow:inset 0 0 0 1.5px var(--bad);color:#8b3427}
.opt .k{width:22px;color:var(--muted);font-size:12.5px;flex:none}
.opt .ip{font-family:var(--mono);font-size:12.5px;color:var(--muted);margin-left:auto}

/* ---------- empty ---------- */
.empty{text-align:center;padding:56px 20px}
.empty .ico{font-size:40px;margin-bottom:12px;opacity:.8}
.empty h3{font-size:16px;font-weight:600;margin-bottom:6px}
.empty p{font-size:13.5px;color:var(--muted)}

/* ---------- summary ---------- */
.summary{text-align:center;padding:30px 10px}
.summary .big{font-size:52px;font-weight:650;color:var(--accent)}
.summary .lbl{font-size:13px;color:var(--muted);margin-bottom:24px}
.stats3{display:flex;gap:10px;margin:18px 0 26px}
.stats3 div{flex:1;background:var(--card);border-radius:14px;padding:14px 8px;box-shadow:var(--shadow)}
.stats3 b{display:block;font-size:20px;font-weight:650}
.stats3 span{font-size:11.5px;color:var(--muted)}

/* ---------- tabbar ---------- */
#tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:30;
  background:rgba(255,255,255,.92);backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
  padding-bottom:env(safe-area-inset-bottom);
}
#tabbar .inner{max-width:720px;margin:0 auto;display:flex}
#tabbar a{
  flex:1;padding:10px 0 12px;display:flex;flex-direction:column;align-items:center;gap:3px;
  font-size:10.5px;color:var(--muted);
}
#tabbar a .ti{font-size:19px;line-height:1}
#tabbar a.on{color:var(--accent);font-weight:600}

/* ---------- sheet ---------- */
.sheet-mask{position:fixed;inset:0;z-index:60;background:rgba(20,18,15,.42);display:flex;align-items:flex-end;justify-content:center;animation:fade .18s ease both}
.sheet{width:100%;max-width:520px;background:var(--card);border-radius:24px 24px 0 0;padding:24px 20px calc(22px + env(safe-area-inset-bottom));box-shadow:0 -10px 40px rgba(0,0,0,.16);animation:up .22s ease both}
.sheet h3{font-size:17px;font-weight:650}
.sheet .sub{font-size:13px;color:var(--muted);margin-top:5px;margin-bottom:20px;line-height:1.55}
.opts-row{display:flex;gap:8px}
.opt-pill{flex:1;padding:14px 0;border-radius:13px;background:var(--bg);font-weight:650;font-size:16px;color:var(--ink)}
.opt-pill.on{background:var(--accent);color:#fff}
@keyframes up{from{transform:translateY(26px);opacity:.5}to{transform:none;opacity:1}}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:16px;right:16px;bottom:92px;z-index:80;max-width:688px;margin:0 auto;
  background:#2b2825;color:#fff;padding:13px 16px;border-radius:14px;font-size:13.5px;line-height:1.55;
  box-shadow:0 10px 30px rgba(0,0,0,.28);animation:fade .2s ease both;
}
.toast b{color:#ffd9a8;font-weight:600}

/* ---------- misc ---------- */
.kv{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.chip{
  display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border-radius:999px;
  background:var(--bg);font-size:12px;color:var(--muted);
}
.chip.on{background:var(--accent-soft);color:var(--accent);font-weight:600}
.divider{height:1px;background:var(--line);margin:16px 0}
.fade{animation:fade .28s ease both}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.speak-big{
  margin-top:18px;padding:12px 22px;border-radius:999px;background:var(--accent-soft);
  color:var(--accent);font-weight:600;font-size:14.5px;
}