:root{--ink:#0f172a;--mut:#475569;--bg:#f8fafc;--blue:#1d4ed8;--mag:#c026d3;--line:#e2e8f0}
*{box-sizing:border-box}body{margin:0;font:16px/1.55 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--blue)}.w{max-width:1080px;margin:0 auto;padding:0 20px}.sr{position:absolute;left:-9999px}
.bar{background:#0f172a;color:#fff;text-align:center;font-size:14px;padding:8px 12px}.bar b{color:#fde047}
header.hdr{display:flex;justify-content:space-between;align-items:center;padding:14px 0;max-width:none;margin:0}.logo{font-weight:800;font-size:20px;text-decoration:none;color:var(--ink)}.logo span{color:var(--mag)}
.hdr nav a{margin-left:16px;font-size:14px;text-decoration:none;color:var(--mut)}.hdr nav a.btn{color:#fff}
.btn{display:inline-block;background:var(--blue);color:#fff;font-weight:700;padding:13px 22px;border-radius:10px;text-decoration:none;border:2px solid var(--blue);font-size:16px;cursor:pointer;margin:0}.btn.o{background:#fff;color:var(--blue)}.btn.sm{padding:8px 14px;font-size:14px}.btn.wide{display:block;text-align:center}
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;padding:28px 0 40px}
h1{font-size:44px;line-height:1.1;margin:0 0 14px;letter-spacing:-.02em}h1 em{font-style:normal;color:var(--mag)}
.lead{font-size:19px;color:var(--mut);margin:0 0 22px}.ctas{display:flex;gap:12px;flex-wrap:wrap}.fine{font-size:14px;color:var(--mut);margin-top:12px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:0 6px 24px rgba(15,23,42,.06)}.card .drill{border:0;padding:0;margin:0;background:none}.kicker{font-size:12px;letter-spacing:.06em;color:var(--mut);margin:0 0 6px}
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px}.trust b{display:block;font-size:15px}
section{padding:48px 0;margin:0}section.alt{background:#fff}h2{font-size:28px;margin:0 0 8px}.sub{color:var(--mut);margin:0 0 22px}.mt{margin-top:36px}
.g3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.g2{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.topic{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:16px;text-decoration:none;color:var(--ink)}.topic small{color:var(--mut);display:block}
.price{display:grid;grid-template-columns:1.3fr .7fr;gap:24px;align-items:center;background:#fff;border:2px solid var(--blue);border-radius:16px;padding:28px}.pc{text-align:center}
.big{font-size:52px;font-weight:800;line-height:1}ul.ck{padding:0;list-style:none}ul.ck li{padding-left:26px;position:relative;margin:7px 0}ul.ck li:before{content:"✓";position:absolute;left:0;color:#16a34a;font-weight:800}
.drill{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;margin:14px 0}.drill h3{margin-top:0}figure{margin:0 0 8px}figure svg{width:100%;max-width:300px;height:auto;background:#fdfcf4;border:1px solid #e5e2cc;border-radius:6px}
.opts{list-style:none;padding:0;margin:0}.opt{width:100%;text-align:left;font:inherit;padding:10px 12px;margin:4px 0;border:1px solid #cbd5e1;border-radius:8px;background:#fff;cursor:pointer;color:var(--ink)}
.opt.correct{background:#dcfce7;border-color:#16a34a}.opt.wrong{background:#fee2e2;border-color:#dc2626}.reveal{margin-top:8px;font:inherit;background:none;border:0;color:var(--blue);text-decoration:underline;cursor:pointer;padding:0}
.expl{background:#eff6ff;border-left:4px solid var(--blue);padding:8px 12px;margin-top:10px;font-size:15px}.verdict{font-weight:700}.src{font-size:13px;color:var(--mut)}
#drills .drill{max-width:760px}
details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:8px 0}summary{font-weight:600;cursor:pointer}
.signup{display:flex;gap:8px;flex-wrap:wrap}.signup input{flex:1;min-width:200px;padding:12px;border:1px solid #cbd5e1;border-radius:10px;font:inherit}.signup small{width:100%;color:var(--mut)}
.doc{max-width:760px;padding-top:20px;padding-bottom:40px}.doc h1{font-size:36px}.doc h2{font-size:22px;margin-top:28px}.note{background:#fef9c3;border:1px solid #fde047;padding:8px 12px;border-radius:8px;font-size:14px}.cta2{margin-top:32px;display:flex;gap:10px;flex-wrap:wrap}
footer.ftr{padding:28px 0 90px;font-size:13px;color:var(--mut);border-top:1px solid var(--line);max-width:none;margin:0;background:var(--bg)}
.sticky{display:none}
@media(max-width:820px){.hero,.g2,.price{grid-template-columns:1fr}.g3{grid-template-columns:1fr 1fr}.trust{grid-template-columns:1fr 1fr}h1{font-size:32px}.hdr nav a:not(.btn){display:none}
.sticky{display:flex;position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--line);padding:10px 14px;gap:10px;align-items:center;justify-content:space-between;z-index:9}}
@media(max-width:480px){.g3{grid-template-columns:1fr}}