:root{
  --ground:#EAF4FE; --glow:#F9FCFD; --surface:#FFFFFF; --surface-2:#F2F8FF;
  --ink:#0B1F5C; --ink-2:#4B5E88; --ink-3:#8394B8; --line:#D6E5F8;
  --primary:#005BFD; --primary-ink:#FFFFFF; --primary-soft:#E1EDFF; --mid:#2F8BFA; --sky:#7CC5FC;
  --success:#12915A; --success-soft:#E2F5EC; --danger:#CF3A3A; --danger-soft:#FBE7E7; --warn:#B87D00;
  --shadow:0 1px 2px rgba(11,31,92,.06),0 8px 24px rgba(11,31,92,.08);
  --display:"Montserrat","Avenir Next","Segoe UI",system-ui,sans-serif;
  --body:"Manrope","Segoe UI",system-ui,-apple-system,sans-serif;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --ground:#071430; --glow:#0C1C43; --surface:#0E1E47; --surface-2:#132856;
    --ink:#EAF2FF; --ink-2:#A3B5DA; --ink-3:#6F84B3; --line:#21386B;
    --primary:#3D8BFF; --primary-ink:#FFFFFF; --primary-soft:#16306A; --mid:#5AA6FF; --sky:#7CC5FC;
    --success:#3CC98A; --success-soft:#0F3A2C; --danger:#FF7B7B; --danger-soft:#3E1B24; --warn:#E8B340;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --ground:#071430; --glow:#0C1C43; --surface:#0E1E47; --surface-2:#132856;
  --ink:#EAF2FF; --ink-2:#A3B5DA; --ink-3:#6F84B3; --line:#21386B;
  --primary:#3D8BFF; --primary-ink:#FFFFFF; --primary-soft:#16306A; --mid:#5AA6FF; --sky:#7CC5FC;
  --success:#3CC98A; --success-soft:#0F3A2C; --danger:#FF7B7B; --danger-soft:#3E1B24; --warn:#E8B340;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%}
body{margin:0;background:radial-gradient(120% 70% at 50% 30%,var(--glow),var(--ground) 70%) fixed,var(--ground);color:var(--ink);font:15px/1.6 var(--body);-webkit-font-smoothing:antialiased}
button,input,textarea,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.tg{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line);background:var(--surface)}
.tg .back{all:unset;cursor:pointer;width:32px;height:32px;display:grid;place-items:center;border-radius:50%;color:var(--primary)}
.tg .back[hidden]{display:none}
.tg .ttl{flex:1;min-width:0}
.tg .ttl b{display:block;font:600 15px/1.2 var(--display);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tg .ttl span{font-size:12px;color:var(--ink-3)}
.tg img{width:22px;height:auto}
.view{flex:1;overflow-y:auto;padding:20px 18px 28px}
.tabs{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);background:var(--surface);padding-bottom:env(safe-area-inset-bottom,0px)}
.tabs button{all:unset;cursor:pointer;text-align:center;padding:10px 4px 12px;font-size:12px;color:var(--ink-3);display:flex;flex-direction:column;align-items:center;gap:3px}
.tabs button svg{width:22px;height:22px}
.tabs button[aria-current="true"]{color:var(--primary);font-weight:600}
/* ---- type ---- */
h1,h2,h3{font-family:var(--display);text-wrap:balance;margin:0}
h1{font-size:24px;line-height:1.2;font-weight:700;letter-spacing:-.01em}
h2{font-size:18px;line-height:1.3;font-weight:600}
h3{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);font-weight:600}
.muted{color:var(--ink-2)}
.small{font-size:13px}
.stack{display:flex;flex-direction:column;gap:14px}
.stack-lg{display:flex;flex-direction:column;gap:24px}
/* ---- controls ---- */
.btn{all:unset;box-sizing:border-box;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 18px;border-radius:14px;background:var(--primary);color:var(--primary-ink);font:600 15px/1.2 var(--display);text-align:center;transition:transform .12s ease,filter .12s ease}
.btn:hover{filter:brightness(1.06)}
.btn:active{transform:scale(.985)}
.btn.ghost{background:var(--primary-soft);color:var(--primary)}
.btn.line{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn[disabled]{opacity:.45;pointer-events:none}
.btn.sm{min-height:36px;padding:8px 12px;font-size:13px;border-radius:10px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:99px;font-size:12px;font-weight:600;background:var(--surface-2);color:var(--ink-2)}
.chip.ok{background:var(--success-soft);color:var(--success)}
.chip.bad{background:var(--danger-soft);color:var(--danger)}
.chip.pri{background:var(--primary-soft);color:var(--primary)}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:13px;font-weight:600;color:var(--ink-2)}
.field input,.field select,.field textarea{background:var(--surface-2);border:1px solid var(--line);border-radius:12px;padding:12px 14px;min-height:46px;width:100%}
.field textarea{min-height:96px;resize:vertical}
/* ---- splash ---- */
.splash{display:flex;flex-direction:column;align-items:center;text-align:center;gap:22px;padding:28px 6px 8px}
.splash img{width:112px}
.word{font:600 40px/1 var(--display);letter-spacing:.3em;margin-right:-.3em;color:var(--ink)}
.tagline{font:500 12px/1 var(--display);letter-spacing:.34em;margin-right:-.34em;color:var(--mid);text-transform:uppercase}
.splash .lead{max-width:34ch;color:var(--ink-2)}
.tg-login{background:#2AABEE;color:#fff}
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;width:100%}
.facts div{background:var(--surface-2);border-radius:14px;padding:12px 6px}
.facts b{display:block;font:700 20px/1.1 var(--display);color:var(--primary);font-variant-numeric:tabular-nums}
.facts span{font-size:12px;color:var(--ink-2)}
/* ---- choices ---- */
.progress-bar{height:6px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.progress-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--sky));border-radius:99px;transition:width .3s ease}
.options{display:flex;flex-direction:column;gap:10px}
.opt{all:unset;box-sizing:border-box;cursor:pointer;display:flex;gap:12px;align-items:flex-start;padding:14px;border:1.5px solid var(--line);border-radius:14px;background:var(--surface);line-height:1.45}
.opt .k{flex:none;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;background:var(--surface-2);font:600 13px/1 var(--display);color:var(--ink-2)}
.opt:hover{border-color:var(--mid)}
.opt[aria-pressed="true"]{border-color:var(--primary);background:var(--primary-soft)}
.opt[aria-pressed="true"] .k{background:var(--primary);color:#fff}
/* ---- home ---- */
.hello{display:flex;align-items:center;gap:14px}
.ring{--p:0;flex:none;width:64px;height:64px;border-radius:50%;background:conic-gradient(var(--primary) calc(var(--p)*1%),var(--surface-2) 0);display:grid;place-items:center}
.ring span{width:50px;height:50px;border-radius:50%;background:var(--surface);display:grid;place-items:center;font:700 14px/1 var(--display);font-variant-numeric:tabular-nums}
.continue{background:linear-gradient(135deg,var(--primary),var(--mid));color:#fff;border-radius:20px;padding:18px;display:flex;flex-direction:column;gap:10px}
.continue small{opacity:.85;font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-family:var(--display);font-weight:600}
.continue h2{color:#fff}
.continue .btn{background:#fff;color:#0B1F5C;align-self:flex-start;min-height:40px;padding:8px 16px}
.module{display:flex;flex-direction:column;gap:6px}
.module header{display:flex;justify-content:space-between;align-items:baseline;gap:8px;padding:0 2px}
.module header span{font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.lessons{border:1px solid var(--line);border-radius:16px;overflow:hidden}
.lrow{all:unset;box-sizing:border-box;cursor:pointer;display:flex;align-items:center;gap:12px;width:100%;padding:12px 14px;border-top:1px solid var(--line);background:var(--surface)}
.lrow:first-child{border-top:0}
.lrow:hover{background:var(--surface-2)}
.lrow[aria-disabled="true"]{cursor:default;color:var(--ink-3)}
.lrow .num{flex:none;width:30px;height:30px;border-radius:10px;display:grid;place-items:center;font:600 13px/1 var(--display);background:var(--surface-2);color:var(--ink-2);font-variant-numeric:tabular-nums}
.lrow.done .num{background:var(--success-soft);color:var(--success)}
.lrow.cur .num{background:var(--primary);color:#fff}
.lrow .t{flex:1;min-width:0;font-size:14px;line-height:1.35}
.lrow .s{flex:none;font-size:12px;font-variant-numeric:tabular-nums;color:var(--ink-3)}
.lrow.done .s{color:var(--success);font-weight:600}
/* ---- lesson ---- */
.lesson-head{display:flex;flex-direction:column;gap:8px}
.eyebrow{font:600 11.5px/1 var(--display);letter-spacing:.14em;text-transform:uppercase;color:var(--primary)}
.prose p{margin:0 0 12px;max-width:65ch}
.audio{display:flex;align-items:center;gap:12px;background:var(--surface-2);border-radius:14px;padding:10px 12px}
.audio .play{all:unset;cursor:pointer;width:40px;height:40px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center;flex:none}
.audio .track{flex:1;height:4px;border-radius:99px;background:var(--line);position:relative}
.audio .track i{position:absolute;inset:0 auto 0 0;width:0;background:var(--primary);border-radius:99px}
.audio span{font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.block{border-top:1px solid var(--line);padding-top:18px;display:flex;flex-direction:column;gap:12px}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;font-size:12.5px;line-height:1.4;min-width:100%}
th,td{padding:8px 10px;text-align:left;vertical-align:top;border-top:1px solid var(--line);white-space:pre-line}
th{background:var(--surface-2);font-weight:700;border-top:0;position:sticky;top:0}
td:first-child,th:first-child{position:sticky;left:0;background:var(--surface);font-weight:600}
th:first-child{background:var(--surface-2)}
.check{display:flex;flex-direction:column;gap:2px}
.check label{display:flex;gap:10px;align-items:flex-start;padding:8px 4px;cursor:pointer;line-height:1.45}
.check input{width:20px;height:20px;accent-color:var(--primary);flex:none;margin-top:1px}
.extra-h{font:600 14px/1.3 var(--display);color:var(--ink)}
.extra-p{white-space:pre-line;color:var(--ink-2);font-size:14px}
.upload{display:flex;align-items:center;gap:10px;border:1.5px dashed var(--line);border-radius:12px;padding:12px;font-size:13px;color:var(--ink-2)}
/* ---- result ---- */
.score{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;padding:10px 0}
.score b{font:700 56px/1 var(--display);font-variant-numeric:tabular-nums}
.score.ok b{color:var(--success)}
.score.bad b{color:var(--danger)}
.qlist{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}
.qlist i{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font:600 12px/1 var(--display);font-style:normal}
.qlist .y{background:var(--success-soft);color:var(--success)}
.qlist .n{background:var(--danger-soft);color:var(--danger)}
/* ---- paywall ---- */
.plan{border:1.5px solid var(--line);border-radius:18px;padding:16px;display:flex;flex-direction:column;gap:10px}
.plan.best{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-soft)}
.plan .price{font:700 26px/1 var(--display);font-variant-numeric:tabular-nums}
.plan ul{margin:0;padding-left:18px;color:var(--ink-2);font-size:14px}
.stars{display:inline-flex;align-items:center;gap:4px}
/* ---- certificate ---- */
.cert{position:relative;border-radius:18px;overflow:hidden;background:linear-gradient(160deg,#FFFFFF 0%,#EAF4FE 100%);color:#0B1F5C;padding:22px 20px;border:1px solid #CFE2F8;display:flex;flex-direction:column;gap:12px}
.cert::after{content:"";position:absolute;right:-60px;top:-60px;width:200px;height:200px;border-radius:50%;background:radial-gradient(circle,#7CC5FC55,transparent 70%)}
.cert .top{display:flex;justify-content:space-between;align-items:center;gap:10px}
.cert .top img{width:34px}
.cert .top .w{font:600 16px/1 var(--display);letter-spacing:.3em}
.cert .kind{font:600 11px/1 var(--display);letter-spacing:.2em;text-transform:uppercase;color:#005BFD}
.cert .name{font:700 24px/1.15 var(--display)}
.cert .course{color:#4B5E88;font-size:14px}
.cert .grades{display:grid;grid-template-columns:repeat(2,1fr);gap:6px 12px;font-size:12.5px}
.cert .grades div{display:flex;justify-content:space-between;border-bottom:1px dashed #CFE2F8;padding:3px 0;gap:8px}
.cert .grades b{font-variant-numeric:tabular-nums}
.cert .foot{display:flex;justify-content:space-between;align-items:flex-end;gap:12px}
.cert .foot small{display:block;font-size:11px;color:#4B5E88}
.cert .foot b{font-variant-numeric:tabular-nums;font-size:13px}
.cert .qr{background:#fff;padding:6px;border-radius:10px;border:1px solid #CFE2F8;line-height:0}
.cert .total{display:flex;align-items:baseline;gap:10px}
.cert .total b{font:700 34px/1 var(--display);color:#005BFD;font-variant-numeric:tabular-nums}
.verify{border-radius:18px;padding:18px;background:var(--success-soft);color:var(--success);display:flex;gap:12px;align-items:center}
.verify b{font:700 18px/1.2 var(--display)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;font-size:14px}
.kv dt{color:var(--ink-3)}
.kv dd{margin:0;font-weight:600;font-variant-numeric:tabular-nums}
.bars{display:flex;flex-direction:column;gap:10px}
.bar{display:grid;grid-template-columns:130px 1fr 32px;gap:10px;align-items:center;font-size:13px}
.bar .tr{height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.bar .tr i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--sky))}
.bar b{font-variant-numeric:tabular-nums;text-align:right}
.note{font-size:12.5px;color:var(--ink-3);border-left:3px solid var(--sky);padding:4px 0 4px 10px}
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--surface);padding:10px 16px;border-radius:12px;font-size:14px;box-shadow:var(--shadow);z-index:10}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
/* ---- real app layout ---- */
.app{display:flex;flex-direction:column;min-height:100vh;min-height:100dvh;max-width:560px;margin:0 auto;background:var(--surface)}
@media (min-width:600px){.app{border-left:1px solid var(--line);border-right:1px solid var(--line)}}
.in-tg .tg{display:none}
.view{padding:20px 18px calc(28px + env(safe-area-inset-bottom,0px))}
.center{min-height:60vh;display:grid;place-items:center;text-align:center}
.spinner{width:36px;height:36px;border-radius:50%;border:3px solid var(--primary-soft);border-top-color:var(--primary);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.err{background:var(--danger-soft);color:var(--danger);border-radius:14px;padding:14px;font-size:14px}