:root{--pri:#6d28d9;--pri-d:#4c1d95;--pri-s:#f1e9ff;--gold:#f5a524;--ink:#1e1633;--muted:#6a6086;--line:#e7dff5;--paper:#faf7ff;--card:#ffffff;--ok:#2f9e62;--ok-d:#217548;--ok-s:#e5f6ec;--bad:#d23b3b;--bad-s:#fdecec;--shadow:0 10px 30px rgba(76,29,149,.10);--radius:18px;
--font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
--han:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Noto Sans SC","Source Han Sans SC","WenQuanYi Micro Hei",sans-serif}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
html,body{margin:0;padding:0;background:var(--paper);color:var(--ink);font-family:var(--font);line-height:1.5}
button,input{font:inherit;color:inherit}button{cursor:pointer}
a{color:var(--pri)}h1{font-size:26px;line-height:1.2;margin:8px 0 10px}h2{font-size:19px;margin:22px 0 8px}
.han,.han-opt span.han{font-family:var(--han)}
.muted{color:var(--muted)}.small{font-size:13px}.hint{color:var(--muted);font-size:14px;margin:4px 0 12px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:12px 0}.row.center{justify-content:center}
.grow{flex:1;min-width:0}
:focus-visible{outline:3px solid #7c3aed;outline-offset:2px;border-radius:8px}
.app{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}

/* top + bottom bars */
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:14px;padding:9px 16px;background:rgba(250,247,255,.94);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit}
.logo{width:36px;height:36px;border-radius:10px;background:var(--pri);color:#fff;display:grid;place-items:center;font-weight:700;font-size:18px}
.brand b{font-size:15px;display:block;line-height:1.1}.brand small{display:block;color:var(--muted);font-size:11px;letter-spacing:.04em}
.nav{display:flex;gap:4px;margin-left:12px}.nav a{padding:8px 12px;border-radius:10px;color:var(--muted);font-weight:600;font-size:14px;text-decoration:none}
.nav a.on,.nav a:hover{background:var(--pri-s);color:var(--pri-d)}
.stats{margin-left:auto;display:flex;gap:8px}
.pill{background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 11px;font-size:13px;font-weight:700;display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.pill small{font-weight:600;color:var(--muted);font-size:11px}
.pill.xp{color:#b45309}.pill.heart{color:var(--bad)}.pill.streak{color:#d35400}
.bottomnav{display:none}
.page{flex:1;max-width:980px;width:100%;margin:0 auto;padding:22px 16px 90px}

/* buttons / cards */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:14px;padding:12px 20px;font-weight:700;font-size:15px;text-decoration:none;text-align:center;line-height:1.2;min-height:44px}
.btn.big{padding:14px 26px;font-size:16px}
.btn-w{background:#fff;color:var(--pri-d)}
.btn-r{background:var(--pri);color:#fff;box-shadow:0 5px 0 var(--pri-d)}.btn-r:active{transform:translateY(3px);box-shadow:0 2px 0 var(--pri-d)}
.btn-g{background:var(--ok);color:#fff;box-shadow:0 5px 0 var(--ok-d)}.btn-g:active{transform:translateY(3px);box-shadow:0 2px 0 var(--ok-d)}
.btn-ghost{background:transparent;border:1.5px solid var(--line);color:var(--ink)}
.btn-google{background:#fff;border:1.5px solid #dadce0;color:#3c4043;box-shadow:0 2px 0 #dadce0}
.btn[disabled],.btn.off{opacity:.45;cursor:not-allowed;box-shadow:none;pointer-events:none}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.card h3{margin:0 0 6px;font-size:16px}.card p{margin:0;color:var(--muted);font-size:14px}
.card.danger{border-color:#f3c6d0}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}
.authbox{display:flex;gap:14px;align-items:center;margin:16px 0;flex-wrap:wrap}.authbox p{margin:2px 0 0}.authbox.warn{border-color:#d9c8f7;background:#fff8e8}
.who-ava img{border-radius:50%;display:block}.who-ava{font-size:28px}
.cta{margin:22px 0}.foot{text-align:center;margin:30px 0 0;font-size:13px}
.toggle{display:flex;gap:10px;align-items:center;padding:10px 0;font-size:15px}.toggle input{width:20px;height:20px}

/* landing */
.hero{background:linear-gradient(160deg,#4c1d95 0%,#7c3aed 55%,#5b21b6 100%);color:#fff;border-radius:26px;padding:44px 36px;position:relative;overflow:hidden;box-shadow:var(--shadow)}
.hero::after{content:"汉语";position:absolute;right:-6px;top:-18px;font-family:var(--han);font-size:170px;opacity:.12;font-weight:800;pointer-events:none}
.hero .kicker{letter-spacing:.16em;font-size:12px;opacity:.9;text-transform:uppercase}
.hero h1{margin:10px 0 8px;font-size:42px;line-height:1.12}.hero p{max-width:520px;opacity:.96;font-size:17px;margin:0 0 6px}
.hero-stats{display:flex;gap:28px;margin:22px 0 14px}.hero-stats b{display:block;font-size:28px}.hero-stats span{font-size:12px;opacity:.9}
.steps ol{margin:8px 0 0;padding-left:20px;color:var(--muted)}.steps{margin-top:18px}

/* home */
.homehead{display:flex;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-bottom:14px}
.goal{display:flex;gap:12px;align-items:center}.goal p{margin:0;color:var(--muted);font-size:14px}
.banner{display:flex;gap:12px;align-items:center;background:#f5f0ff;border:1px solid #d9c8f7;border-radius:16px;padding:12px 14px;text-decoration:none;color:inherit;margin:8px 0}
.banner span{font-size:24px}.banner div{flex:1}.banner small{display:block;color:var(--muted)}.banner em{font-style:normal;font-size:24px;color:var(--gold)}
.unit{margin:26px 0 10px;display:flex;align-items:center;gap:12px}
.unit-badge{background:var(--pri);color:#fff;border-radius:12px;padding:8px 13px;font-weight:800;font-size:13px}
.unit h2{margin:0;font-size:19px}.unit p{margin:0;color:var(--muted);font-size:13px}
.path{display:flex;flex-direction:column;align-items:center;gap:14px;padding:6px 0 24px}
.node{width:min(560px,100%);display:grid;grid-template-columns:64px 1fr auto;gap:14px;align-items:center;background:var(--card);border:2px solid var(--line);border-radius:22px;padding:12px 14px;text-decoration:none;color:inherit;transition:transform .15s,border-color .15s}
a.node:hover{transform:translateY(-2px);border-color:#cdb8f3}
.node.done{border-color:#9ad0b3;background:#f4fbf6}.node.locked{opacity:.6}
.node .idx{width:58px;height:58px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:800;font-size:20px;background:radial-gradient(circle at 30% 30%,#a78bfa,var(--pri-d));box-shadow:0 5px 0 #3b1478;font-family:var(--han)}
.node.done .idx{background:radial-gradient(circle at 30% 30%,#5dcc8a,var(--ok-d));box-shadow:0 5px 0 #165536}
.node.locked .idx{background:#cbbfb6;box-shadow:0 5px 0 #a89b93;font-size:18px}
.node .meta b{display:block;font-size:16px}.node .meta .zh{color:var(--pri-d);font-size:15px}.node .meta small{color:var(--muted)}
.progress-mini{height:7px;background:#ece4f8;border-radius:99px;margin-top:6px;overflow:hidden}.progress-mini span{display:block;height:100%;background:var(--ok)}

/* lesson */
.lesson-head{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
.back{display:inline-block;align-self:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px 12px;font-weight:700;text-decoration:none;color:var(--ink);font-size:14px}
.big-zh{font-size:22px;color:var(--pri)}.big-zh .py{font-size:14px;color:var(--muted)}
.mods{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.mod{display:block;text-align:left;width:100%;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;text-decoration:none;color:inherit;min-height:104px}
.mod:hover{border-color:#cdb8f3}.mod .ic{font-size:24px}.mod b{display:block;margin-top:6px}.mod span{color:var(--muted);font-size:13px}
.mod.practice{grid-column:1/-1;background:linear-gradient(180deg,#fff,#f8e8e9)}
.mod.tone .ic{font-size:34px;color:var(--pri)}.mod.tone .ex{margin-top:6px;font-size:18px}

/* lists */
.vocab-list{display:grid;gap:10px}
.vcard{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:10px 14px}
.vhan{font-size:28px;font-weight:700;min-width:64px}.vcard .py{color:var(--pri-d);font-weight:600}.vcard .ex{color:var(--muted);font-size:13px}
.speak{width:44px;height:44px;border-radius:50%;border:0;background:var(--pri-s);color:var(--pri);font-size:18px;flex:none}
.exrow .speak,.zh .speak{width:34px;height:34px;font-size:14px;vertical-align:middle}
.search{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--line);margin:8px 0 12px;font-size:16px;background:#fff}
.filters{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}.chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:13px;min-width:38px}
.chip.on{background:var(--pri);color:#fff;border-color:var(--pri)}

/* grammar */
.gbox{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;margin-bottom:14px}.gbox h3{margin:0 0 8px}
.pattern{background:#f5f0ff;border:1px dashed #d9c8f7;border-radius:12px;padding:10px 12px;font-weight:700;margin:8px 0 12px;overflow-wrap:anywhere}
.exrow{padding:8px 0;border-top:1px solid var(--line)}.exrow .zh{font-size:20px}.exrow .py,.dline .py{color:var(--muted);font-size:13px}
.mistake{background:var(--bad-s);border-radius:12px;padding:12px;margin-top:10px}.mistake .bad{color:var(--bad);text-decoration:line-through}.mistake .good{color:var(--ok-d);font-weight:700}.mistake .why{margin-top:6px;font-size:14px}

/* dialogue */
.dline{display:grid;grid-template-columns:96px 1fr auto;gap:10px;padding:12px 8px;border-bottom:1px solid var(--line);border-radius:10px}
.dline.playing{background:var(--pri-s)}.dline .who{color:var(--pri-d)}.dline .who small{display:block;color:var(--muted)}
.dline .zh{font-size:20px}.dline .mn{margin-top:2px}

/* hanzi cards */
.hcards{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px}
.hcard{background:var(--card);border:1px solid var(--line);border-radius:18px;min-height:150px;padding:14px;text-align:center;display:grid;place-items:center}
.hcard .front{font-size:44px;font-weight:700}.hcard .back-side{display:none}.hcard.flipped .front{display:none}.hcard.flipped .back-side{display:block}.hcard .py{color:var(--pri-d);font-weight:700;font-size:18px}

/* pinyin table */
.ptable{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.pcell{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px;text-align:left}.pcell b{font-size:22px;color:var(--pri);display:block}.pcell span{font-size:15px}.pcell small{display:block;color:var(--muted);font-size:12px;margin-top:2px}

/* quiz */
.quiz-wrap{max-width:640px;margin:0 auto;padding-bottom:110px}
.qtop{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.qtop .x{font-size:22px;text-decoration:none;color:var(--muted);padding:6px 10px}
.qbar{flex:1;height:14px;background:#ece4f8;border-radius:99px;overflow:hidden}.qbar span{display:block;height:100%;background:var(--ok);border-radius:99px;transition:width .25s}
.qcard{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:22px 18px;min-height:300px}
.qtype{color:var(--muted);font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:700;margin-bottom:10px}
.prompt{font-size:26px;margin:10px 0 4px;overflow-wrap:anywhere}.prompt.han{font-size:38px}
.choices{display:grid;gap:10px;margin-top:8px}
.choice{display:flex;gap:12px;align-items:center;text-align:left;background:#fff;border:2px solid var(--line);border-radius:14px;padding:12px 14px;font-size:16px;min-height:52px;width:100%}
.choice .k{flex:none;width:26px;height:26px;border:2px solid var(--line);border-radius:8px;display:grid;place-items:center;font-size:12px;color:var(--muted);font-weight:700}
.choice:hover{border-color:#cdb8f3}.choice.on{border-color:var(--pri);background:var(--pri-s)}
.choice.ok{border-color:var(--ok);background:var(--ok-s)}.choice.bad{border-color:var(--bad);background:var(--bad-s)}
.choice.han-opt{font-family:var(--han);font-size:20px}
.match{display:grid;grid-template-columns:1fr 1fr;gap:12px}.mcol{display:grid;gap:8px;align-content:start}.mcol .choice{justify-content:center;text-align:center;flex-direction:column;gap:2px;font-size:15px}.mcol small{color:var(--muted);font-size:12px}
.tiles{display:flex;flex-wrap:wrap;gap:8px;min-height:56px;padding:8px 4px;margin-bottom:12px}.tiles.built{border-bottom:2px solid var(--line)}
.tile{background:#fff;border:2px solid var(--line);border-bottom-width:4px;border-radius:10px;padding:8px 13px;font-size:22px;min-width:46px;min-height:46px}
.tile.ghost{background:#ece4f8;color:transparent;border-color:#ece4f8}
.qfoot{position:fixed;left:0;right:0;bottom:0;z-index:40;background:var(--paper);border-top:1px solid var(--line);padding:12px 16px calc(12px + env(safe-area-inset-bottom));display:flex;align-items:center;gap:14px;justify-content:space-between}
.qfoot #fb{flex:1;font-size:15px;min-width:0}.qfoot .btn{min-width:150px}
.qfoot.ok{background:var(--ok-s);color:#176b3c}.qfoot.bad{background:var(--bad-s);color:#8a1f1f}
.qfoot .py{color:inherit;opacity:.8;font-size:13px}
.result{text-align:center;padding:30px 8px;max-width:640px;margin:0 auto}.result h2{font-size:30px;margin:0 0 6px}
.big-emoji{font-size:64px}.score{font-size:20px;font-weight:700;margin:4px 0}.xp-gain{font-size:24px;color:#b45309;font-weight:800;margin:6px 0}
.unlock{display:inline-block;background:var(--ok-s);color:#176b3c;border-radius:999px;padding:8px 16px;font-weight:700;margin:8px 0}
.missed{text-align:left;margin:16px 0}.missed .vcard{box-shadow:none}

#toast{position:fixed;left:50%;bottom:90px;transform:translate(-50%,20px);background:#241a3d;color:#fff;padding:12px 18px;border-radius:14px;max-width:min(92vw,460px);font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:100}
#toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:720px){
  h1{font-size:23px}.grid3,.mods{grid-template-columns:1fr}.mod.practice{grid-column:auto}
  .hero{padding:26px 20px}.hero h1{font-size:30px}.hero-stats{gap:20px}
  .nav{display:none}.brand small{display:none}.topbar{padding:8px 12px}.pill{padding:4px 9px}
  .page{padding:16px 14px 96px}
  .bottomnav{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:35;background:rgba(255,255,255,.97);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
  .bottomnav a{flex:1;text-align:center;padding:8px 2px;text-decoration:none;color:var(--muted);font-size:11px}.bottomnav a span{display:block;font-size:20px;line-height:1.1}.bottomnav em{font-style:normal;font-weight:600}.bottomnav a.on{color:var(--pri-d)}
  .node{grid-template-columns:52px 1fr auto;gap:10px}.node .idx{width:48px;height:48px;font-size:17px}.node .btn{padding:8px 10px;font-size:13px;min-height:36px}
  .dline{grid-template-columns:1fr auto}.dline .who{grid-column:1/-1}
  .qfoot .btn{min-width:130px}.prompt.han{font-size:34px}
  body:has(.qfoot) .bottomnav{display:none}
  #toast{bottom:100px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ===== төлбөр / paywall ===== */
.btn-gold{background:var(--gold);color:#3b1d00;box-shadow:0 5px 0 #b8770a}.btn-gold:active{transform:translateY(3px);box-shadow:0 2px 0 #b8770a}
.btn.sm{padding:8px 14px;min-height:36px;font-size:13px;box-shadow:none}
.hublink{margin-left:auto;font-size:13px!important;color:var(--pri)!important}
.fine{font-size:13px;opacity:.9;margin:6px 0 0}
.node.pay{border-style:dashed;background:#fbf8ff}.node.pay .idx{background:#cbbfe0;box-shadow:0 5px 0 #a99cc4}
.paywall{max-width:720px;margin:0 auto}
.plans{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:18px 0}
.plan{position:relative;background:var(--card);border:2px solid var(--line);border-radius:22px;padding:22px 18px;text-align:center;display:flex;flex-direction:column;gap:8px}
.plan.best{border-color:var(--pri);box-shadow:var(--shadow)}
.plan h3{margin:0;font-size:18px}.plan p{margin:0;color:var(--muted);font-size:14px;min-height:40px}
.plan .price{font-size:30px;font-weight:800;color:var(--pri-d);margin:6px 0}
.plan .badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--gold);color:#3b1d00;font-size:12px;font-weight:800;padding:4px 12px;border-radius:999px;white-space:nowrap}
.entrow{display:flex;gap:10px;align-items:center;padding:8px 0;border-top:1px solid var(--line)}.entrow b{flex:1}
@media (max-width:720px){.plans{grid-template-columns:1fr}.hublink{display:none}}