:root{--bg:#fbfaf6;--surface:#fff;--ink:#1a1840;--muted:#5d5b7a;--line:#e6e3f0;--brand:#3b3591;--brand-ink:#fff;--accent:#c6f432;--accent-ink:#1a1840;--shadow:0 10px 30px rgba(31,27,77,.10);--radius:18px}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#12112b;--surface:#1b1a3d;--ink:#f1f0fb;--muted:#a9a7c9;--line:#2c2a58;--brand:#8e87ff;--brand-ink:#12112b;--accent:#c6f432;--accent-ink:#12112b;--shadow:0 10px 30px rgba(0,0,0,.35)}}
:root[data-theme="dark"]{--bg:#12112b;--surface:#1b1a3d;--ink:#f1f0fb;--muted:#a9a7c9;--line:#2c2a58;--brand:#8e87ff;--brand-ink:#12112b;--accent:#c6f432;--accent-ink:#12112b;--shadow:0 10px 30px rgba(0,0,0,.35)}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--brand)}img,svg{max-width:100%}
.wrap{width:min(1120px,100% - 32px);margin-inline:auto}
header.nav{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
.logo img{width:30px;height:30px;border-radius:8px}
.nav ul{display:flex;gap:22px;list-style:none;margin:0;padding:0}
.nav ul a{color:var(--muted);text-decoration:none;font-weight:600;font-size:.95rem}.nav ul a:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;font-weight:700;text-decoration:none;border:2px solid transparent;cursor:pointer;font-size:1rem}
.btn-primary{background:var(--accent);color:var(--accent-ink)}.btn-primary:hover{filter:brightness(.95)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:var(--surface)}
.hero{padding:72px 0 56px;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.eyebrow{display:inline-block;background:var(--surface);border:1px solid var(--line);color:var(--muted);padding:6px 14px;border-radius:999px;font-size:.85rem;font-weight:600}
h1{font-size:clamp(2.2rem,5vw,3.6rem);line-height:1.08;letter-spacing:-.035em;margin:18px 0}
h1 em{font-style:normal;background:linear-gradient(transparent 62%,var(--accent) 62%)}
.lead{font-size:1.15rem;color:var(--muted);max-width:52ch}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.rate-note{font-size:.85rem;color:var(--muted);margin-top:10px;min-height:1.4em}
section{padding:72px 0}
section.alt{background:var(--surface);border-block:1px solid var(--line)}
h2{font-size:clamp(1.7rem,3.4vw,2.4rem);letter-spacing:-.025em;line-height:1.15;margin:0 0 12px}
.sub{color:var(--muted);max-width:62ch;margin:0 0 40px;font-size:1.05rem}
.grid{display:grid;gap:20px;grid-template-columns:repeat(3,1fr)}
.feat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
section.alt .feat{background:var(--bg)}
.ico{width:46px;height:46px;border-radius:14px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-size:1.4rem;margin-bottom:14px}
.feat h3{margin:0 0 6px;font-size:1.15rem}.feat p{margin:0;color:var(--muted)}
.steps{counter-reset:s;display:grid;gap:20px;grid-template-columns:repeat(3,1fr)}
.step{position:relative;padding:26px;border-radius:var(--radius);border:1px dashed var(--line)}
.step::before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--brand);color:var(--brand-ink);font-weight:800;margin-bottom:12px}
.step h3{margin:0 0 6px}.step p{margin:0;color:var(--muted)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat{text-align:center;padding:24px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line)}
.stat b{display:block;font-size:2.2rem;letter-spacing:-.03em;color:var(--brand)}.stat span{color:var(--muted);font-size:.95rem}
.chips{display:flex;flex-wrap:wrap;gap:12px}
.chip{padding:12px 20px;border-radius:999px;background:var(--surface);border:1px solid var(--line);font-weight:700}
.note{margin-top:22px;color:var(--muted);font-size:.95rem}
details{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin-bottom:12px}
details summary{cursor:pointer;font-weight:700}details p{margin:10px 0 0;color:var(--muted)}
.final{text-align:center;background:var(--brand);color:var(--brand-ink);border-radius:28px;padding:56px 24px}
.final h2{color:inherit}.final p{max-width:56ch;margin:0 auto 24px;opacity:.9}
footer{padding:40px 0;color:var(--muted);font-size:.92rem;border-top:1px solid var(--line)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
footer a{color:var(--muted);margin-left:16px}
.doc{padding:56px 0;max-width:760px}.doc h1{font-size:2.2rem}.doc h2{font-size:1.35rem;margin-top:32px}.doc li{margin-bottom:6px}
.draft{background:color-mix(in srgb,var(--accent) 25%,var(--bg));border:1px solid var(--accent);border-radius:12px;padding:14px 18px;margin:20px 0;font-size:.95rem}
@media(max-width:860px){.hero{grid-template-columns:1fr;padding-top:40px}.grid,.steps{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}.nav ul{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.nav-right{display:flex;align-items:center;gap:12px}
.lang{display:inline-flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;background:var(--surface)}
.lang button{border:0;background:none;color:var(--muted);font-weight:700;padding:8px 12px;cursor:pointer;font-size:.85rem}
.lang button[aria-pressed="true"]{background:var(--brand);color:var(--brand-ink)}
.qcard{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:26px;box-shadow:var(--shadow)}
.tag{font-size:.8rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.q{font-size:1.4rem;font-weight:700;line-height:1.3;margin:10px 0 18px}
.opts{display:grid;gap:10px}
.opt{display:flex;align-items:center;gap:12px;text-align:left;padding:12px 14px;border-radius:14px;border:1.5px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;font-weight:600;cursor:pointer}
.opt b{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--surface);border:1px solid var(--line);font-size:.85rem}
.opt:hover{border-color:var(--brand)}
.opt.right{border-color:#2f9e44;background:color-mix(in srgb,#2f9e44 16%,var(--bg))}
.opt.wrong{border-color:#d6336c;background:color-mix(in srgb,#d6336c 14%,var(--bg))}
.result{margin-top:14px;padding:12px 16px;border-radius:14px;background:var(--surface);border:1px solid var(--line);color:var(--muted);font-size:.95rem;min-height:3.2em}
.result.right{border-color:#2f9e44;color:var(--ink)}.result.wrong{border-color:#d6336c;color:var(--ink)}
.rate-note{font-size:.85rem;color:var(--muted);margin:10px 0 0}
.timeline{list-style:none;margin:0;padding:0 0 0 22px;border-left:2px solid var(--line);display:grid;gap:26px}
.timeline li{position:relative}
.timeline li::before{content:"";position:absolute;left:-30px;top:6px;width:14px;height:14px;border-radius:50%;background:var(--surface);border:3px solid var(--brand)}
.timeline li.now::before{background:var(--accent);border-color:var(--accent)}
.timeline .when{font-size:.82rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--brand)}
.timeline h3{margin:2px 0 4px;font-size:1.1rem}.timeline p{margin:0;color:var(--muted)}
@media(max-width:560px){.nav-right .btn{display:none}.nav .wrap{height:58px}}

.demo{perspective:1100px}
.subj-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.subj-tabs button{border:1px solid var(--line);background:var(--surface);color:var(--muted);padding:7px 14px;border-radius:999px;font-weight:700;font-size:.85rem;cursor:pointer}
.subj-tabs button[aria-pressed="true"]{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.qcard{transition:transform .32s ease,opacity .32s ease;will-change:transform}
.qcard.leave{transform:translateX(-60px) rotate(-2deg);opacity:0}
.qcard.enter{transform:translateX(60px);opacity:0;transition:none}
.qcard.shake{animation:shake .5s}
.qcard.flipout{transform:rotateY(90deg);opacity:.2}
.qcard.flipin{transform:rotateY(-90deg);opacity:.2;transition:none}
@keyframes shake{0%,100%{transform:translateX(0)}15%{transform:translateX(-10px)}30%{transform:translateX(9px)}45%{transform:translateX(-7px)}60%{transform:translateX(5px)}80%{transform:translateX(-2px)}}
.opt.right{animation:pop .35s}
@keyframes pop{50%{transform:scale(1.03)}}
@media(prefers-reduced-motion:reduce){.qcard,.qcard.shake,.opt.right{animation:none;transition:none}}
.hero>*{min-width:0}
.opt span,.q,.tag{overflow-wrap:anywhere}
.opt{width:100%}
.ico svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}