@import url(fonts.css);
:root{
  --bg:#f6f1e7; --bg2:#efe7d6; --card:#fffdf8; --ink:#1f2a24; --ink2:#4d5a52; --muted:#7c857f;
  --line:#e3dac6; --accent:#2f6b4f; --accent2:#3f8a66; --accent-soft:#e2efe6; --seal:#c8432b; --seal-soft:#f8e3dc;
  --gold:#b8862b; --gold-soft:#f6ebd2; --ok:#2e7d4f; --ok-soft:#dff1e5; --bad:#c0392b; --bad-soft:#fbe1dc;
  --t1:#d0473a; --t2:#d9892b; --t3:#3f8a66; --t4:#3466a8; --t5:#8b8f93;
  --shadow:0 1px 2px rgba(40,30,10,.06),0 6px 24px -8px rgba(40,30,10,.12);
  --radius:18px; --radius-sm:12px;
  --font:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --zh:'Truc Kai','LXGW WenKai','Kaiti SC','STKaiti','KaiTi','Noto Serif SC','Songti SC',serif;
  --zh-sans:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei','Source Han Sans SC',sans-serif;
}
[data-theme=dark]{
  --bg:#121815; --bg2:#18201c; --card:#1c2520; --ink:#ecebe4; --ink2:#c2c7bf; --muted:#8d978f;
  --line:#2c3831; --accent:#6dbb92; --accent2:#8fd1ad; --accent-soft:#1f3329; --seal:#ef7a62; --seal-soft:#3a221c;
  --gold:#e0b45c; --gold-soft:#33291a; --ok:#6fcf97; --ok-soft:#1b3326; --bad:#f08a7c; --bad-soft:#3a1f1b;
  --t1:#ff7d70; --t2:#f5b35c; --t3:#76c79c; --t4:#7fa7e8; --t5:#9aa0a6;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px -10px rgba(0,0,0,.5);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--font);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.5;
  background:radial-gradient(1200px 600px at 110% -10%,var(--accent-soft),transparent 60%),radial-gradient(900px 500px at -20% 120%,var(--gold-soft),transparent 60%)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
button{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--accent2);outline-offset:2px;border-radius:8px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--bg);padding:.5rem 1rem;z-index:99}
.skip:focus{left:1rem}
.zh{font-family:var(--zh);font-weight:400;letter-spacing:.02em}
.zh-sans{font-family:var(--zh-sans)}
.py{font-family:var(--font);color:var(--ink2);letter-spacing:.01em}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.hide{display:none!important}
h1,h2,h3{line-height:1.25;margin:0 0 .5rem;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(1.6rem,2.6vw,2.2rem)}
h2{font-size:1.3rem}
h3{font-size:1.08rem}
p{margin:.3rem 0 .8rem}

/* shell */
.shell{position:relative;display:grid;grid-template-columns:260px 1fr;min-height:100vh}
.sidebar{position:sticky;top:0;height:100vh;padding:22px 16px;display:flex;flex-direction:column;gap:18px;border-right:1px solid var(--line);background:color-mix(in srgb,var(--bg2) 70%,transparent);backdrop-filter:blur(6px)}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none!important}
.brand b{font-size:1.25rem;letter-spacing:-.01em}
.brand small{display:block;font-size:.95rem;color:var(--muted);margin-top:-4px}
.brand-mobile{display:none}
.nav{display:flex;flex-direction:column;gap:2px}
.nav a{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:12px;color:var(--ink2);font-weight:500;text-decoration:none}
.nav a svg{width:20px;height:20px;flex:none}
.nav a:hover{background:var(--card)}
.nav a.on{background:var(--card);color:var(--accent);box-shadow:var(--shadow)}
.nav .badge{margin-left:auto}
.nav-sep{height:1px;background:var(--line);margin:8px 6px}
.sidebar-foot{margin-top:auto;font-size:.85rem}
.sidebar-foot a{color:var(--muted)}
.main-col{min-width:0;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:12px clamp(16px,3vw,36px);background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid transparent}
.top-stats{margin-left:auto;display:flex;gap:8px;align-items:center}
.chip{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:999px;background:var(--card);border:1px solid var(--line);font-size:.86rem;font-weight:600;color:var(--ink2);white-space:nowrap}
.chip svg{width:16px;height:16px}
.chip.fire{color:var(--seal)}
.chip.goal{color:var(--accent)}
.icon-btn{width:40px;height:40px;border-radius:12px;border:1px solid var(--line);background:var(--card);display:grid;place-items:center;cursor:pointer;flex:none}
.icon-btn:hover{border-color:var(--accent)}
.icon-btn svg{width:20px;height:20px}
main{width:100%;max-width:1120px;margin:0 auto;padding:12px clamp(16px,3vw,36px) 96px;outline:none}
.tabbar{display:none}

/* generic */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.card.flat{box-shadow:none}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.between{justify-content:space-between}
.stack>*+*{margin-top:12px}
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:18px 0 20px}
.page-head p{margin:0;color:var(--ink2)}
.eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:12px;border:1px solid var(--line);background:var(--card);font-weight:600;cursor:pointer;text-decoration:none!important;color:var(--ink);transition:transform .08s,background .15s,border-color .15s;min-height:44px}
.btn:hover{border-color:var(--accent)}
.btn:active{transform:translateY(1px)}
.btn svg{width:18px;height:18px}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
[data-theme=dark] .btn.primary{color:#0e1512}
.btn.primary:hover{filter:brightness(1.07)}
.btn.seal{background:var(--seal);border-color:var(--seal);color:#fff}
.btn.ghost{background:transparent}
.btn.sm{padding:6px 12px;min-height:36px;font-size:.9rem;border-radius:10px}
.btn.lg{padding:14px 24px;font-size:1.05rem}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn.block{width:100%}
.badge{display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 7px;border-radius:999px;background:var(--seal);color:#fff;font-size:.75rem;font-weight:700}
.tag{display:inline-flex;align-items:center;gap:4px;padding:2px 9px;border-radius:999px;font-size:.75rem;font-weight:700;background:var(--accent-soft);color:var(--accent)}
.tag.l1{background:#e4f1e8;color:#2c6e4b}.tag.l2{background:#f7ecd5;color:#8d6418}.tag.l3{background:#f8e1da;color:#a5402c}
[data-theme=dark] .tag.l1{background:#1d3428;color:#8fd1ad}[data-theme=dark] .tag.l2{background:#352b17;color:#e7bf6f}[data-theme=dark] .tag.l3{background:#3a221c;color:#f39a86}
.seg{display:inline-flex;background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:3px;gap:2px;flex-wrap:wrap}
.seg button{border:0;background:transparent;padding:7px 14px;border-radius:9px;cursor:pointer;font-weight:600;color:var(--ink2);font-size:.92rem}
.seg button.on{background:var(--card);color:var(--accent);box-shadow:var(--shadow)}
.progress{height:8px;background:var(--bg2);border-radius:99px;overflow:hidden}
.progress>i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:99px;transition:width .4s}
.input{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--ink);font:inherit;min-height:46px}
.input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
label.field{display:block;font-weight:600;margin-bottom:6px}
.empty{text-align:center;padding:40px 20px;color:var(--ink2)}
.empty .big{font-size:3rem;font-family:var(--zh);color:var(--accent);opacity:.8}
.speak{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--card);display:inline-grid;place-items:center;cursor:pointer;flex:none;color:var(--accent)}
.speak:hover{background:var(--accent-soft)}
.speak svg{width:18px;height:18px}
.speak.sm{width:30px;height:30px}.speak.sm svg{width:15px;height:15px}
.speaking{animation:pulse 1s infinite}
@keyframes pulse{50%{box-shadow:0 0 0 6px var(--accent-soft)}}

/* home */
.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:16px;margin-top:8px}
.hero-main{position:relative;overflow:hidden;background:linear-gradient(135deg,var(--accent) 0%,#24543e 100%);color:#f4ecd8;border:0}
[data-theme=dark] .hero-main{background:linear-gradient(135deg,#24543e,#173527)}
.hero-main h1{color:#fff}
.hero-main .eyebrow{color:#cfe6d7}
.hero-main .btn.primary{background:#f4ecd8;color:#1f3a2c;border-color:#f4ecd8}
.hero-main .btn.ghost{color:#f4ecd8;border-color:rgba(244,236,216,.35)}
.hero-main .bg-zh{position:absolute;right:-10px;bottom:-40px;font-size:11rem;line-height:1;opacity:.09;font-family:var(--zh);pointer-events:none}
.next-lesson{margin:16px 0 18px;padding:14px 16px;border-radius:14px;background:rgba(255,255,255,.1);display:flex;gap:14px;align-items:center}
.next-lesson .zh{font-size:2rem;line-height:1}
.ring{--p:0;width:92px;height:92px;border-radius:50%;background:conic-gradient(var(--c,var(--accent)) calc(var(--p)*1%),var(--bg2) 0);display:grid;place-items:center;flex:none}
.ring>span{width:74px;height:74px;border-radius:50%;background:var(--card);display:grid;place-items:center;text-align:center;font-weight:700;line-height:1.1}
.ring small{display:block;font-size:.7rem;color:var(--muted);font-weight:600}
.level-card{display:flex;gap:16px;align-items:center}
.goal-bar{display:flex;align-items:center;gap:12px}
.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.quick a{display:flex;flex-direction:column;gap:6px;padding:16px;border-radius:16px;background:var(--card);border:1px solid var(--line);color:var(--ink);text-decoration:none;box-shadow:var(--shadow);transition:transform .12s}
.quick a:hover{transform:translateY(-2px);border-color:var(--accent)}
.quick a svg{width:26px;height:26px;color:var(--accent)}
.quick a b{font-size:.98rem}
.quick a span{font-size:.82rem;color:var(--muted)}
.wod{display:flex;gap:18px;align-items:center}
.wod .zh{font-size:3.4rem;line-height:1}

/* roadmap */
.stage{position:relative;margin:0 0 26px}
.stage-head{display:flex;gap:16px;align-items:flex-start;justify-content:space-between;flex-wrap:wrap;padding:20px;border-radius:var(--radius);background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow)}
.stage-head .lvl{font-family:var(--zh);font-size:2.6rem;line-height:1;color:var(--accent)}
.stage-meta{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}
.stage-can{margin:.4rem 0 0;padding-left:1.1rem;color:var(--ink2);font-size:.93rem}
.units{position:relative;margin:18px 0 0 34px;padding-left:28px;border-left:6px solid var(--accent-soft)}
.unit{position:relative;margin-bottom:20px}
.unit::before{content:"";position:absolute;left:-41px;top:14px;width:20px;height:20px;border-radius:50%;background:var(--card);border:5px solid var(--accent)}
.unit.locked::before{border-color:var(--line)}
.unit h3{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.lesson-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.lesson-node{display:flex;gap:12px;align-items:center;padding:12px 14px;border-radius:14px;background:var(--card);border:1px solid var(--line);color:var(--ink);text-decoration:none!important;transition:transform .1s,border-color .15s;min-height:64px}
.lesson-node:hover{border-color:var(--accent);transform:translateY(-1px)}
.lesson-node .dot{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;font-weight:700;background:var(--bg2);color:var(--ink2);flex:none}
.lesson-node.done .dot{background:var(--accent);color:#fff}
.lesson-node.current{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.lesson-node.current .dot{background:var(--seal);color:#fff}
.lesson-node.locked{opacity:.55;cursor:not-allowed}
.lesson-node .t{font-weight:600;font-size:.94rem;line-height:1.3}
.lesson-node .s{font-size:.82rem;color:var(--muted)}
.lesson-node .zh{font-size:1.05rem}
.lesson-node.reading .dot{background:var(--gold-soft);color:var(--gold)}
.lesson-node.reading.done .dot{background:var(--gold);color:#fff}
.lesson-node.test .dot{background:var(--seal-soft);color:var(--seal)}
.pre-stage .stage-head{background:linear-gradient(135deg,var(--gold-soft),var(--card))}

/* lesson player */
.player{max-width:780px;margin:0 auto}
.player-top{display:flex;align-items:center;gap:14px;margin:10px 0 18px}
.player-top .progress{flex:1;height:10px}
.steps{display:flex;gap:6px;margin-bottom:16px;flex-wrap:wrap}
.steps span{padding:4px 12px;border-radius:999px;font-size:.8rem;font-weight:700;background:var(--bg2);color:var(--muted)}
.steps span.on{background:var(--accent);color:#fff}
.steps span.done{background:var(--accent-soft);color:var(--accent)}
.word-card{text-align:center;padding:30px 22px}
.word-card .hz{font-family:var(--zh);font-size:clamp(4rem,14vw,7rem);line-height:1.1;margin:6px 0}
.word-card .py{font-size:1.5rem;font-weight:500}
.word-card .vi{font-size:1.2rem;font-weight:600;margin:.4rem 0}
.example{margin-top:18px;padding:14px 16px;border-radius:14px;background:var(--bg2);text-align:left}
.example .zh{font-size:1.35rem;line-height:1.5}
.example .py{font-size:.92rem}
.example .vi{font-size:.95rem;color:var(--ink2);font-weight:400;margin:0}
.src{font-size:.75rem;color:var(--muted)}
.src a{color:var(--muted);text-decoration:underline}
.tone1{color:var(--t1)}.tone2{color:var(--t2)}.tone3{color:var(--t3)}.tone4{color:var(--t4)}.tone5{color:var(--t5)}
.q-card{padding:26px}
.q-prompt{text-align:center;margin-bottom:20px}
.q-prompt .hz{font-family:var(--zh);font-size:clamp(3rem,10vw,4.6rem);line-height:1.15}
.q-prompt .sent{font-family:var(--zh);font-size:1.6rem;line-height:1.5}
.q-prompt .ask{font-size:.9rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:8px}
.q-prompt .vi-big{font-size:1.5rem;font-weight:700}
.opts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.opt{padding:14px 16px;border-radius:14px;border:2px solid var(--line);background:var(--card);cursor:pointer;text-align:left;font-weight:600;min-height:58px;display:flex;align-items:center;gap:10px;transition:border-color .12s,background .12s}
.opt:hover{border-color:var(--accent2)}
.opt .k{width:26px;height:26px;border-radius:8px;background:var(--bg2);display:grid;place-items:center;font-size:.8rem;color:var(--muted);flex:none}
.opt.zhopt{font-family:var(--zh);font-size:1.6rem;font-weight:400;justify-content:center}
.opt.zhopt .k{font-family:var(--font)}
.opt.ok{border-color:var(--ok);background:var(--ok-soft)}
.opt.bad{border-color:var(--bad);background:var(--bad-soft)}
.opt[disabled]{cursor:default}
.feedback{margin-top:16px;padding:14px 16px;border-radius:14px;display:flex;gap:12px;align-items:flex-start;justify-content:space-between;flex-wrap:wrap}
.feedback.ok{background:var(--ok-soft);color:var(--ok)}
.feedback.bad{background:var(--bad-soft);color:var(--bad)}
.feedback .detail{color:var(--ink);font-weight:400}
.type-row{display:flex;gap:10px}
.result-hero{text-align:center;padding:34px 20px}
.result-hero .score{font-size:3.4rem;font-weight:800;color:var(--accent);line-height:1}
.confetti{font-family:var(--zh);font-size:4rem;color:var(--seal)}

/* flashcard */
.fc-wrap{max-width:620px;margin:0 auto}
.flash{perspective:1400px;cursor:pointer;margin:8px 0 18px}
.flash-inner{position:relative;min-height:360px;transition:transform .5s cubic-bezier(.2,.7,.2,1);transform-style:preserve-3d}
.flash.flipped .flash-inner{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:26px;text-align:center;border-radius:24px;background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow)}
.flash-face.back{transform:rotateY(180deg)}
.flash-face .hz{font-family:var(--zh);font-size:clamp(4rem,15vw,6.5rem);line-height:1.1}
.flash-face .hint{position:absolute;bottom:14px;font-size:.8rem;color:var(--muted)}
.rate{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.rate .btn{flex-direction:column;gap:0;padding:10px}
.rate .btn small{font-weight:500;font-size:.75rem;color:var(--muted)}
.rate .again{border-color:var(--bad);color:var(--bad)}
.rate .good{border-color:var(--accent);color:var(--accent)}
.rate .easy{border-color:var(--gold);color:var(--gold)}

/* dictionary */
.search-box{position:relative}
.search-box svg{position:absolute;left:14px;top:50%;transform:translateY(-50%);width:20px;height:20px;color:var(--muted)}
.search-box .input{padding-left:44px;font-size:1.05rem;min-height:52px;border-radius:14px}
.word-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px}
.word-item{display:flex;gap:14px;align-items:center;padding:12px 14px;border-radius:14px;background:var(--card);border:1px solid var(--line);color:var(--ink);text-decoration:none!important}
.word-item:hover{border-color:var(--accent)}
.word-item .zh{font-size:1.9rem;line-height:1;min-width:2.2em}
.word-item .meta{min-width:0}
.word-item .py{font-size:.92rem}
.word-item .vi{font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.detail-head{display:flex;gap:24px;align-items:center;flex-wrap:wrap}
.detail-head .hz{font-family:var(--zh);font-size:clamp(4rem,12vw,6rem);line-height:1}
.char-tiles{display:flex;gap:12px;flex-wrap:wrap}
.char-tile{display:flex;flex-direction:column;align-items:center;padding:10px 14px;border-radius:14px;border:1px solid var(--line);background:var(--bg2);color:var(--ink);text-decoration:none!important;min-width:84px}
.char-tile .zh{font-size:2.2rem;line-height:1.1}
.char-tile:hover{border-color:var(--accent)}
.writer-box{display:flex;flex-direction:column;align-items:center;gap:12px}
.writer{width:260px;height:260px;border-radius:20px;background:var(--card);border:1px solid var(--line);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}
.writer svg{position:relative}
.def-list{margin:0;padding-left:1.1rem}
.def-list li{margin:.2rem 0}
dl.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;margin:0}
dl.kv dt{color:var(--muted);font-size:.88rem}
dl.kv dd{margin:0}

/* grammar */
.gp-list{display:grid;gap:10px}
.gp-item{display:flex;gap:14px;align-items:center;padding:14px 16px;border-radius:14px;background:var(--card);border:1px solid var(--line);color:var(--ink);text-decoration:none!important}
.gp-item:hover{border-color:var(--accent)}
.gp-item .n{width:40px;height:40px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-weight:700;flex:none;font-size:.85rem}
.gp-item.done .n{background:var(--accent);color:#fff}
.formula{font-family:var(--zh);font-size:1.25rem;padding:14px 16px;border-radius:14px;background:var(--gold-soft);border:1px dashed var(--gold);color:var(--ink)}
.note{padding:12px 14px;border-radius:12px;background:var(--seal-soft);color:var(--ink);border-left:4px solid var(--seal);font-size:.95rem}
.ex-list{display:grid;gap:10px}
.ex{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border-radius:14px;background:var(--bg2)}
.ex .zh{font-size:1.3rem;line-height:1.45}
.ex .py{font-size:.88rem}
.ex .vi{font-size:.93rem;color:var(--ink2)}

/* reading */
.reading-tools{position:sticky;top:64px;z-index:5;display:flex;gap:8px;flex-wrap:wrap;padding:10px;border-radius:14px;background:color-mix(in srgb,var(--card) 92%,transparent);border:1px solid var(--line);backdrop-filter:blur(8px);margin-bottom:16px}
.r-line{display:flex;gap:12px;padding:12px 6px;border-bottom:1px dashed var(--line);align-items:flex-start;border-radius:10px;transition:background .2s}
.r-line.active{background:var(--accent-soft)}
.r-sp{flex:none;min-width:64px;text-align:center}
.r-sp .zh{display:block;font-size:1.1rem;color:var(--accent)}
.r-sp small{display:block;font-size:.72rem;color:var(--muted)}
.r-body{flex:1;min-width:0}
.r-text{font-family:var(--zh);font-size:1.55rem;line-height:2.4}
.r-text ruby{ruby-position:over;cursor:pointer;border-radius:6px;padding:0 1px}
.r-text ruby:hover{background:var(--gold-soft)}
.r-text rt{font-family:var(--font);font-size:.68rem;color:var(--ink2);letter-spacing:0;padding-bottom:2px}
.hide-py .r-text rt,.hide-py .ex .py,.hide-py .example .py{visibility:hidden}
.hide-py .r-text{line-height:1.9}
.r-vi{font-size:.95rem;color:var(--ink2);margin-top:2px}
.hide-vi .r-vi{display:none}
.pop{position:fixed;z-index:60;max-width:300px;padding:14px 16px;border-radius:14px;background:var(--card);border:1px solid var(--line);box-shadow:0 12px 40px -10px rgba(0,0,0,.35)}
.pop .zh{font-size:2rem;line-height:1.1}

/* stats */
.stat-num{font-size:2rem;font-weight:800;line-height:1.1}
.stat-lbl{font-size:.85rem;color:var(--muted)}
.heat{display:grid;grid-auto-flow:column;grid-template-rows:repeat(7,14px);gap:3px;overflow-x:auto;padding-bottom:4px}
.heat i{width:14px;height:14px;border-radius:3px;background:var(--bg2)}
.heat i.h1{background:#cfe5d7}.heat i.h2{background:#8cc3a2}.heat i.h3{background:#3f8a66}.heat i.h4{background:#245c41}
[data-theme=dark] .heat i.h1{background:#22412f}[data-theme=dark] .heat i.h2{background:#2f6b4f}[data-theme=dark] .heat i.h3{background:#4f9d76}[data-theme=dark] .heat i.h4{background:#8fd1ad}
.bars{display:flex;align-items:flex-end;gap:8px;height:120px}
.bars div{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;font-size:.75rem;color:var(--muted)}
.bars b{display:block;width:100%;background:var(--accent);border-radius:6px 6px 2px 2px;min-height:2px}
table.simple{width:100%;border-collapse:collapse;font-size:.93rem}
table.simple th,table.simple td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}
table.simple th{color:var(--muted);font-weight:600;font-size:.82rem}

/* pinyin page */
.tone-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.tone-cell{padding:16px 10px;border-radius:16px;border:1px solid var(--line);background:var(--card);text-align:center;cursor:pointer}
.tone-cell:hover{border-color:var(--accent)}
.tone-cell .mk{font-size:1.9rem;font-weight:700}
.tone-cell .zh{font-size:1.6rem}
.tone-cell svg{width:100%;height:36px}
.py-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(86px,1fr));gap:8px}
.py-cell{padding:10px 6px;border-radius:12px;border:1px solid var(--line);background:var(--card);text-align:center;cursor:pointer}
.py-cell:hover{border-color:var(--accent);background:var(--accent-soft)}
.py-cell b{display:block;font-size:1.15rem}
.py-cell .zh{font-size:1.25rem}
.py-cell small{display:block;color:var(--muted);font-size:.75rem}

/* modal & toast */
.modal{position:fixed;inset:0;z-index:70;display:grid;place-items:center;padding:16px;background:rgba(15,20,17,.5);backdrop-filter:blur(3px)}
.modal[hidden]{display:none}
.modal-box{width:min(560px,100%);max-height:90vh;overflow:auto;background:var(--card);border-radius:22px;padding:24px;box-shadow:0 30px 80px -20px rgba(0,0,0,.5);position:relative}
.modal-close{position:absolute;right:14px;top:14px}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(20px);opacity:0;z-index:80;padding:12px 18px;border-radius:14px;background:var(--ink);color:var(--bg);font-weight:600;font-size:.93rem;transition:all .25s;pointer-events:none;max-width:min(92vw,520px);text-align:center}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}
.switch{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--line)}
.switch:last-child{border-bottom:0}
.switch input[type=checkbox]{width:46px;height:26px;appearance:none;background:var(--line);border-radius:99px;position:relative;cursor:pointer;flex:none;transition:background .2s}
.switch input[type=checkbox]::after{content:"";position:absolute;left:3px;top:3px;width:20px;height:20px;border-radius:50%;background:#fff;transition:left .2s}
.switch input[type=checkbox]:checked{background:var(--accent)}
.switch input[type=checkbox]:checked::after{left:23px}
.src-list li{margin-bottom:.7rem}
.kbd{font-size:.75rem;padding:1px 6px;border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;color:var(--muted)}

@media (max-width:1000px){
  .shell{grid-template-columns:1fr}
  .sidebar{display:none}
  .brand-mobile{display:flex;gap:8px}
  .brand-mobile b{font-size:1.1rem}
  .tabbar{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:30;background:color-mix(in srgb,var(--card) 94%,transparent);backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
  .tabbar a{display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 2px;font-size:.7rem;font-weight:600;color:var(--muted);text-decoration:none;border-radius:10px;position:relative}
  .tabbar a svg{width:22px;height:22px}
  .tabbar a.on{color:var(--accent)}
  .tabbar .badge{position:absolute;top:0;right:18%;min-width:18px;height:18px;font-size:.65rem;padding:0 5px}
  .hero{grid-template-columns:1fr}
  .quick{grid-template-columns:repeat(2,1fr)}
  .g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  body{font-size:15px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .opts{grid-template-columns:1fr}
  .card{padding:16px}
  .top-stats .chip.hide-sm{display:none}
  .units{margin-left:10px;padding-left:20px}
  .unit::before{left:-33px}
  .tone-grid{grid-template-columns:repeat(3,1fr)}
  .r-sp{min-width:48px}
  .r-text{font-size:1.35rem}
  .reading-tools{top:60px}
  .flash-inner{min-height:320px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}