:root{
  --bg:#f3f5f1; --surface:#ffffff; --ink:#1b2420; --muted:#5e6b64; --line:#d9e0da;
  --jade:#0f6b5c; --jade-soft:#dcebe6; --seal:#b4342a; --seal-soft:#f6e1de; --gold:#8a6a1f; --gold-soft:#f3ead2;
  --shadow:0 1px 2px rgb(20 40 30 / .06),0 8px 24px rgb(20 40 30 / .07);
  --f-display:"Bricolage Grotesque",ui-sans-serif,system-ui,sans-serif;
  --f-body:"Noto Sans SC",ui-sans-serif,system-ui,"PingFang SC","Microsoft YaHei",sans-serif;
  --f-han:"Noto Serif SC","Songti SC","SimSun",serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#121815; --surface:#1a221e; --ink:#e7ede9; --muted:#9aa9a1; --line:#2c3832;
  --jade:#5cc2a8; --jade-soft:#1d3a32; --seal:#ef7d70; --seal-soft:#3d2320; --gold:#d8b860; --gold-soft:#3a3220;
  --shadow:0 1px 2px rgb(0 0 0 / .3),0 8px 24px rgb(0 0 0 / .3); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#121815; --surface:#1a221e; --ink:#e7ede9; --muted:#9aa9a1; --line:#2c3832;
  --jade:#5cc2a8; --jade-soft:#1d3a32; --seal:#ef7d70; --seal-soft:#3d2320; --gold:#d8b860; --gold-soft:#3a3220;
  --shadow:0 1px 2px rgb(0 0 0 / .3),0 8px 24px rgb(0 0 0 / .3); color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:15px;line-height:1.5;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:0 40px}
.wrap{max-width:760px;margin:0 auto}
header{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-block:18px 10px}
.brand{display:flex;align-items:center;gap:10px}
.seal{width:40px;height:40px;border-radius:8px;background:var(--seal);color:#fff;display:grid;place-items:center;font-family:var(--f-han);font-weight:700;font-size:22px;transform:rotate(-4deg)}
.brand h1{font-family:var(--f-display);font-size:22px;margin:0;letter-spacing:-.01em}
.brand p{margin:0;color:var(--muted);font-size:12.5px}
nav{display:flex;gap:4px;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:4px}
nav a{padding:7px 14px;border-radius:999px;color:var(--muted);text-decoration:none;font-weight:500;font-size:14px}
nav a[aria-current="page"]{background:var(--jade);color:var(--surface)}
nav a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--jade);outline-offset:2px}
/* Decks: one horizontally scrolling row, with fades and arrows showing when there's more to see. */
.deckscroll{position:relative;margin:6px 0 14px}
.decks{display:flex;flex-wrap:nowrap;gap:6px;overflow-x:auto;overscroll-behavior-x:contain;scroll-behavior:smooth;scroll-snap-type:x proximity;
  scrollbar-width:none;-webkit-overflow-scrolling:touch;touch-action:pan-x;padding:2px 0}
.decks::-webkit-scrollbar{display:none}
.chip{flex:none;scroll-snap-align:start}
.deckscroll::before,.deckscroll::after{content:"";position:absolute;top:0;bottom:0;width:40px;pointer-events:none;opacity:0;transition:opacity .2s;z-index:1}
.deckscroll::before{left:0;background:linear-gradient(to right,var(--bg),transparent)}
.deckscroll::after{right:0;background:linear-gradient(to left,var(--bg),transparent)}
.deckscroll.more-l::before,.deckscroll.more-r::after{opacity:1}
.deckarrow{position:absolute;top:50%;transform:translateY(-50%);z-index:2;width:30px;height:30px;border-radius:50%;border:1px solid var(--line);
  background:var(--surface);color:var(--ink);box-shadow:var(--shadow);cursor:pointer;display:none;place-items:center;font:inherit;font-size:15px;line-height:1;padding:0}
.deckarrow.l{left:0}.deckarrow.r{right:0}
.deckscroll.more-l .deckarrow.l,.deckscroll.more-r .deckarrow.r{display:grid}
@media (hover:none){.deckscroll .deckarrow{display:none!important}}
.chip{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:6px 12px;font:inherit;font-size:13.5px;cursor:pointer;display:flex;gap:6px;align-items:center}
.chip .n{color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}
.chip[aria-pressed="true"]{background:var(--jade-soft);border-color:var(--jade);color:var(--ink)}
.label{font-size:11.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:500}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.spread{justify-content:space-between}
select,input[type=text]{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:7px 10px}
button.btn{font:inherit;font-weight:500;border-radius:10px;padding:10px 16px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer}
button.btn.primary{background:var(--jade);border-color:var(--jade);color:var(--surface)}
button.btn.again{background:var(--seal-soft);border-color:transparent;color:var(--seal)}
button.btn.got{background:var(--jade-soft);border-color:transparent;color:var(--jade)}
button.btn:disabled{opacity:.45;cursor:default}
button.ghost{background:none;border:none;color:var(--muted);font:inherit;font-size:13px;cursor:pointer;padding:6px 8px;border-radius:8px}
button.ghost:hover{color:var(--ink)}

/* flashcard */
.stage{perspective:1400px;margin:12px 0}
.card{position:relative;height:340px;cursor:pointer;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.3,.7,.3,1)}
.card.flipped{transform:rotateY(180deg)}
/* Padding clears the corner label (top), the hint and speaker button (bottom); content never touches the edges. */
.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);display:flex;flex-direction:column;padding:44px 28px 60px;text-align:center;overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain}
.fc{margin:auto 0;display:flex;flex-direction:column;align-items:center;gap:6px;min-width:0;width:100%}
.fc>*{max-width:100%;overflow-wrap:anywhere}
.face.back{transform:rotateY(180deg)}
.face .corner{position:absolute;top:14px;left:16px;right:16px;display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}
.han{font-family:var(--f-han);font-weight:500;line-height:1.15;font-size:clamp(44px,13vw,96px);word-break:keep-all}
.han.long{font-size:clamp(28px,7vw,46px)}
.han.xlong{font-size:clamp(24px,5.5vw,34px);line-height:1.3}
.py{color:var(--jade);font-size:clamp(20px,4.5vw,28px);font-weight:500}
.en{font-family:var(--f-display);font-size:clamp(22px,5vw,34px);font-weight:600;letter-spacing:-.01em}
.hk{color:var(--gold);font-size:13.5px;background:var(--gold-soft);padding:2px 10px;border-radius:999px}
.ex{margin-top:10px;border-top:1px dashed var(--line);padding-top:10px;max-width:520px}
.ex .h{font-family:var(--f-han);font-size:19px}
.ex .p{color:var(--jade);font-size:14px}
.ex .e{color:var(--muted);font-size:13.5px;font-style:italic}
.exsay{font:inherit;font-size:12.5px;color:var(--jade);background:var(--jade-soft);border:none;border-radius:999px;padding:3px 10px;margin:4px 0 2px;cursor:pointer}
.hint{color:var(--muted);font-size:12.5px;position:absolute;bottom:20px;left:56px;right:56px}
.speak{position:absolute;bottom:12px;right:12px;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--jade);cursor:pointer;display:grid;place-items:center}
.ctrl{display:grid;grid-template-columns:auto 1fr 1fr auto;gap:8px;align-items:center}
.ctrl .btn{padding:12px}
.progressbar{height:6px;background:var(--line);border-radius:99px;overflow:hidden;margin-top:12px}
.progressbar i{display:block;height:100%;background:var(--jade);transition:width .3s}
.boxes{display:flex;gap:3px}
.boxes span{width:8px;height:8px;border-radius:2px;background:var(--line)}
.boxes span.on{background:var(--jade)}

/* test */
.panel{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow)}
.setup{display:grid;gap:16px}
.types{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px}
.type{border:1px solid var(--line);border-radius:12px;padding:10px 12px;cursor:pointer;display:flex;gap:10px;align-items:flex-start;background:var(--bg)}
.type input{margin-top:3px;accent-color:var(--jade)}
.type b{display:block;font-size:14px}
.type small{color:var(--muted);font-size:12px}
.q{text-align:center;display:grid;gap:6px;justify-items:center;padding:8px 0 16px}
.q .ask{color:var(--muted);font-size:13px}
.opts{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.opt{font:inherit;text-align:center;padding:14px 10px;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--ink);cursor:pointer;min-height:56px}
.opt.hanopt{font-family:var(--f-han);font-size:24px}
.opt.pyopt{font-size:19px;color:var(--jade)}
.opt.right{background:var(--jade-soft);border-color:var(--jade)}
.opt.wrong{background:var(--seal-soft);border-color:var(--seal);color:var(--seal)}
.feedback{min-height:24px;text-align:center;margin-top:12px;font-size:14px}
.feedback.ok{color:var(--jade)} .feedback.no{color:var(--seal)}
.typein{display:flex;gap:8px}
.typein input{flex:1;min-width:0;font-size:18px;padding:12px}
.score{font-family:var(--f-display);font-size:56px;font-weight:700;color:var(--jade);line-height:1}
.miss{display:grid;gap:6px;margin-top:12px}
.miss div{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;align-items:baseline;border-bottom:1px solid var(--line);padding:6px 0}
.miss .mh{font-family:var(--f-han);font-size:22px}
.miss small{color:var(--muted)}
.hist{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.hist span{font-size:12px;padding:3px 8px;border-radius:6px;background:var(--bg);border:1px solid var(--line);font-variant-numeric:tabular-nums}

/* progress */
.deckrows{display:grid;gap:12px}
.deckrow{display:grid;grid-template-columns:150px 1fr auto;gap:12px;align-items:center}
.bar{height:12px;border-radius:6px;background:var(--line);overflow:hidden;display:flex}
.bar i:nth-child(1){background:var(--jade)} .bar i:nth-child(2){background:var(--gold)}
.legend{display:flex;gap:14px;font-size:12.5px;color:var(--muted);flex-wrap:wrap}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px}
.wordgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:6px;margin-top:14px}
.wg{border:1px solid var(--line);border-radius:10px;padding:6px;text-align:center;background:var(--surface)}
.wg .h{font-family:var(--f-han);font-size:20px;line-height:1.2}
.wg small{display:block;color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.wg.s0{border-left:4px solid var(--seal)} .wg.s1{border-left:4px solid var(--gold)} .wg.s2{border-left:4px solid var(--jade)}
@media (max-width:560px){
  .ctrl{grid-template-columns:1fr 1fr}
  .ctrl .nav{display:none}
  .deckrow{grid-template-columns:1fr auto}
  .deckrow .bar{grid-column:1/-1;order:3}
  .card{height:320px}
  .face{padding:42px 18px 58px}
}
@media (prefers-reduced-motion:reduce){.card{transition:none}}

/* ---------- app shell ---------- */
html{-webkit-text-size-adjust:100%}
body{padding-top:env(safe-area-inset-top,0px);-webkit-tap-highlight-color:transparent;overscroll-behavior-y:none}
nav a .ic{display:none}
.streak{font-size:12.5px;color:var(--gold);background:var(--gold-soft);padding:3px 10px;border-radius:999px;font-variant-numeric:tabular-nums}
.decksbar{display:flex;align-items:center;gap:8px}
.decksbar .label{flex:none}
@media (max-width:700px){
  header{padding-block:12px 6px}
  .brand p{display:none}
  body{padding-bottom:calc(78px + env(safe-area-inset-bottom,0px))}
  nav{position:fixed;left:0;right:0;bottom:0;z-index:20;border-radius:0;border:none;border-top:1px solid var(--line);
    padding:6px 6px calc(6px + env(safe-area-inset-bottom,0px));justify-content:space-around;gap:0;
    background:color-mix(in srgb,var(--surface) 92%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
  nav a{display:flex;flex-direction:column;align-items:center;gap:1px;padding:5px 4px;font-size:10.5px;flex:1;border-radius:10px}
  nav a .ic{display:block;font-size:20px;line-height:1.1;font-family:var(--f-han)}
  nav a[aria-current="page"]{background:var(--jade-soft);color:var(--jade)}
  .deckscroll{margin-inline:-16px}
  .decks{padding-inline:16px;scroll-padding-inline:16px}
}
@media (display-mode:standalone){header{padding-top:8px}}
button,select{touch-action:manipulation}

/* ---------- guided audio ---------- */
.lesson-opts{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:8px}
.mode{border:1px solid var(--line);border-radius:12px;padding:10px 12px;cursor:pointer;display:flex;gap:10px;align-items:flex-start;background:var(--bg)}
.mode input{margin-top:3px;accent-color:var(--jade)}
.mode b{display:block;font-size:14px}.mode small{color:var(--muted);font-size:12px}
.player{text-align:center;display:grid;gap:8px;justify-items:center;padding:12px 0}
.player .han{transition:opacity .3s}
.player .stepline{min-height:22px;color:var(--muted);font-size:13.5px}
.player .stepline.go{color:var(--seal);font-weight:500}
.pulse{width:14px;height:14px;border-radius:50%;background:var(--jade);opacity:.2}
.pulse.on{opacity:1;animation:pl 1s ease-in-out infinite}
@keyframes pl{50%{transform:scale(1.5);opacity:.5}}
.pctrl{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.pctrl .btn{min-width:56px;padding-inline:12px}
.veiled{filter:blur(10px);opacity:.5}
.note{font-size:12.5px;color:var(--muted);margin:10px 0 0}

/* ---------- characters ---------- */
.chargrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(54px,1fr));gap:6px}
.cg{font-family:var(--f-han);font-size:26px;line-height:1;padding:12px 0;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);cursor:pointer;position:relative}
.cg.s1{border-bottom:3px solid var(--gold)}.cg.s2{border-bottom:3px solid var(--jade)}
.cg[aria-pressed="true"]{outline:2px solid var(--jade);outline-offset:1px}
.charstudy{display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:start}
.writer{width:260px;height:260px;border:1px solid var(--line);border-radius:14px;background:var(--surface);position:relative;
  background-image:linear-gradient(var(--line),var(--line)),linear-gradient(var(--line),var(--line)),
    linear-gradient(45deg,transparent calc(50% - .5px),var(--line) 50%,transparent calc(50% + .5px)),
    linear-gradient(-45deg,transparent calc(50% - .5px),var(--line) 50%,transparent calc(50% + .5px));
  background-size:100% 1px,1px 100%,100% 100%,100% 100%;background-position:center;background-repeat:no-repeat;touch-action:none}
.writer .fallback{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--f-han);font-size:180px;line-height:1}
.charinfo{display:grid;gap:8px;align-content:start}
.charinfo .big{font-family:var(--f-han);font-size:44px;line-height:1}
.comp{color:var(--gold);font-family:var(--f-han);font-size:15px}
.story{font-size:15px}
.inwords{display:flex;flex-wrap:wrap;gap:6px}
.inwords button{font:inherit;font-size:13.5px;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:8px;padding:4px 8px;cursor:pointer}
.inwords .h{font-family:var(--f-han)}
.wstatus{min-height:22px;font-size:13.5px;color:var(--muted)}
.wstatus.ok{color:var(--jade)}.wstatus.no{color:var(--seal)}
.tabs2{display:flex;gap:4px;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:3px;width:max-content}
.tabs2 button{font:inherit;font-size:13px;border:none;background:none;color:var(--muted);padding:6px 12px;border-radius:7px;cursor:pointer}
.tabs2 button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
@media (max-width:620px){
  .charstudy{grid-template-columns:1fr;justify-items:center}
  .charinfo{justify-items:center;text-align:center}
  .writer{width:min(300px,80vw);height:min(300px,80vw)}
}
.toolrow{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
@media (hover:none){.kbd-hint{display:none}}

/* ---------- home dashboard ---------- */
.hello{margin:4px 0 14px}
.hello h2{font-family:var(--f-display);font-size:28px;margin:2px 0 0;letter-spacing:-.01em}
.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:14px}
.tile{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px;box-shadow:var(--shadow);display:grid;gap:2px;min-width:0}
.tile .big{font-family:var(--f-display);font-size:34px;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums;color:var(--ink)}
.tile small{color:var(--muted);font-size:12.5px}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;align-items:end;height:150px;margin-top:12px}
.wk{display:grid;grid-template-rows:1fr auto;height:100%;gap:6px;position:relative;text-align:center}
.wk .col{display:flex;flex-direction:column;justify-content:flex-end;align-items:center;border-bottom:1px solid var(--line)}
.wk .b{width:min(28px,70%);border-radius:4px 4px 0 0;background:var(--jade);min-height:0}
.wk .b.zero{height:2px!important;background:var(--line);border-radius:0}
.wk .d{font-size:11.5px;color:var(--muted)}
.wk.today .d{color:var(--ink);font-weight:600}
.wk .v{font-size:12px;color:var(--ink);font-variant-numeric:tabular-nums;margin-bottom:3px}
.wk .tip{position:absolute;left:50%;bottom:calc(100% - 4px);transform:translateX(-50%);background:var(--ink);color:var(--surface);font-size:12px;
  padding:4px 8px;border-radius:6px;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .15s;z-index:3}
.wk:hover .tip,.wk:focus .tip{opacity:1}
.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.quick a{display:grid;gap:2px;align-content:start;text-decoration:none;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px;box-shadow:var(--shadow)}
.quick a:hover{border-color:var(--jade)}
.quick .qi{font-family:var(--f-han);font-size:22px;width:38px;height:38px;border-radius:10px;display:grid;place-items:center;background:var(--jade-soft);color:var(--jade);margin-bottom:6px}
.quick b{font-size:14.5px}.quick small{color:var(--muted);font-size:12.5px}
.allwords{margin-top:14px}
.allwords summary{cursor:pointer;color:var(--jade);font-size:14px;font-weight:500}
.resetbox{margin-top:14px;padding:14px;border-radius:12px;background:var(--seal-soft);display:grid;gap:8px}
.resetbox p{margin:0;font-size:13.5px}
@media (max-width:700px){
  .tiles,.quick{grid-template-columns:1fr 1fr}
  .tile .big{font-size:28px}
  .week{height:130px;gap:5px}
}
/* Edge tooltips anchor inward so they never widen the page. */
.wk:nth-child(-n+2) .tip{left:0;transform:none}
.wk:nth-last-child(-n+2) .tip{left:auto;right:0;transform:none}
.bar i:nth-child(2){box-shadow:-2px 0 0 var(--surface)}
label.btn{font:inherit;font-weight:500;border-radius:10px;padding:10px 16px;border:1px solid var(--line);background:var(--surface);color:var(--ink);display:inline-flex;align-items:center}
.resetbox .btn.again{background:var(--seal);border-color:var(--seal);color:#fff}

/* ---------- test: stop + pinyin questions ---------- */
button.btn.stopbtn{padding:7px 12px;font-size:13.5px;color:var(--seal);border-color:var(--seal-soft)}
.stopbox{margin-top:10px;padding:12px 14px;border-radius:12px;background:var(--seal-soft);display:grid;gap:8px}
.pybig{font-size:clamp(28px,7vw,42px);overflow-wrap:anywhere}

/* ---------- test: speaking ---------- */
.speakbox{display:grid;justify-items:center;gap:10px;text-align:center}
.mic{width:84px;height:84px;border-radius:50%;border:none;background:var(--jade);color:#fff;font-size:34px;cursor:pointer;box-shadow:var(--shadow);display:grid;place-items:center}
.mic.on{background:var(--seal);animation:micpulse 1.1s ease-in-out infinite}
.mic:disabled{opacity:.45;cursor:default;animation:none}
@keyframes micpulse{50%{box-shadow:0 0 0 14px color-mix(in srgb,var(--seal) 20%,transparent)}}
.micstate{font-size:14px;color:var(--muted);min-height:21px}
.micstate.ok{color:var(--jade);font-weight:500}.micstate.no{color:var(--seal)}
.heard{font-size:14px;color:var(--muted);min-height:20px}
.heard .h{font-family:var(--f-han);font-size:20px;color:var(--ink)}
.syl{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.sy{display:grid;gap:1px;min-width:52px;padding:6px 8px;border-radius:10px;border:1px solid var(--line);font-size:17px;color:var(--ink);background:var(--bg)}
.sy small{font-size:11px}
.sy.ok{background:var(--jade-soft);border-color:var(--jade)}.sy.ok small{color:var(--jade)}
.sy.tone{background:var(--gold-soft);border-color:var(--gold)}.sy.tone small{color:var(--gold)}
.sy.miss{background:var(--seal-soft);border-color:var(--seal)}.sy.miss small{color:var(--seal)}
@media (prefers-reduced-motion:reduce){.mic.on{animation:none}}
.recbox{display:grid;gap:8px;justify-items:center;padding:12px;border-radius:12px;background:var(--bg);border:1px solid var(--line);width:100%;max-width:420px}
#recBtn.rec{background:var(--seal);border-color:var(--seal);color:#fff}
.micstate .fix{display:block;margin-top:6px;color:var(--muted);font-size:12.5px;line-height:1.45}