:root{--bg:#0b1220;--card:#121a2e;--fg:#e6edf7;--muted:#93a1bd;--accent:#4f8cff}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:radial-gradient(1200px 600px at 50% -10%,#16233f 0,var(--bg) 60%);color:var(--fg);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.wrap,body{min-height:100vh}.wrap{display:grid;place-items:center;padding:24px}.card{max-width:640px;background:var(--card);border:1px solid rgba(255,255,255,.06);border-radius:16px;padding:40px;box-shadow:0 20px 60px rgba(0,0,0,.35)}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:12px;color:var(--accent);margin:0 0 12px;font-weight:700}h1{font-size:clamp(28px,5vw,44px);line-height:1.05;margin:0 0 16px}.lede{color:var(--muted);font-size:18px;line-height:1.6;margin:0 0 24px}.badge{display:inline-block;font-size:13px;font-weight:600;color:#9fe6b8;background:rgba(64,200,120,.12);border:1px solid rgba(64,200,120,.3);padding:6px 12px;border-radius:999px}.card.narrow{max-width:460px;width:100%}.field{display:block;margin:0 0 16px}.field>span{display:block;font-size:13px;font-weight:600;color:var(--muted);margin:0 0 6px}input,select{width:100%;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.12);border-radius:10px;color:var(--fg);font:inherit;font-size:15px;padding:10px 12px}input:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px}select option{background:var(--card)}button{background:var(--accent);border:0;border-radius:10px;color:#06122b;cursor:pointer;font:inherit;font-weight:700;padding:11px 18px;width:100%}button:hover{filter:brightness(1.08)}button.secondary{background:transparent;border:1px solid rgba(255,255,255,.16);color:var(--fg)}.alert{border-radius:10px;font-size:14px;line-height:1.5;margin:0 0 20px;padding:12px 14px}.alert.error{background:rgba(255,99,99,.12);border:1px solid rgba(255,99,99,.32);color:#ffc4c4}.alert.ok{background:rgba(64,200,120,.12);border:1px solid rgba(64,200,120,.3);color:#9fe6b8}.muted-link{color:var(--muted);font-size:14px}.muted-link a{color:var(--accent)}hr.divider{border:0;border-top:1px solid rgba(255,255,255,.08);margin:32px 0}h2{font-size:18px;margin:0 0 16px}dl.facts{margin:0 0 8px;font-size:15px}dl.facts dt{color:var(--muted);font-size:13px;font-weight:600}dl.facts dd{margin:2px 0 14px}.actions{display:flex;gap:12px}.muted{color:var(--muted)}.small{font-size:13px}ul.subtests{list-style:none;padding:0;margin:24px 0 0}ul.subtests li{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0;border-top:1px solid rgba(255,255,255,.08);flex-wrap:wrap}ul.subtests strong{display:block;font-size:16px}ul.subtests .muted{display:block;font-size:13px;margin-top:3px}.sizes{display:flex;gap:8px}.chip{display:inline-block;min-width:44px;text-align:center;padding:7px 12px;border:1px solid rgba(255,255,255,.18);border-radius:6px;text-decoration:none;font-size:14px}.chip:hover{border-color:var(--accent);color:var(--accent)}.progress{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);margin-bottom:14px}h1.prompt{font-size:20px;line-height:1.5;margin:0 0 22px}ul.options{list-style:none;padding:0;margin:0 0 20px;display:grid;grid-gap:9px;gap:9px}.opt{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;padding:13px 15px;font-size:15px;line-height:1.5;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.12);border-radius:8px;color:var(--fg);cursor:pointer}.opt:hover:not(:disabled){border-color:var(--accent)}.opt:disabled{cursor:default;color:var(--fg);opacity:1}.opt .lbl{flex:none;width:22px;font-weight:700;color:var(--muted)}.opt.picked{border-color:var(--accent);background:rgba(255,255,255,.06)}.opt.key{border-color:#3fb950;background:rgba(63,185,80,.12)}.opt.key .lbl{color:#3fb950}.opt.wrong{border-color:#f85149;background:rgba(248,81,73,.1)}.opt.wrong .lbl{color:#f85149}.alert p{margin:8px 0 0;font-size:14px;line-height:1.6}h3.sub{font-size:13px;color:var(--muted);margin:22px 0 8px;font-weight:600}ul.progresslist{list-style:none;padding:0;margin:16px 0 0;display:grid;grid-gap:14px;gap:14px}ul.progresslist .pl-head{display:flex;justify-content:space-between;align-items:baseline;font-size:14px;margin-bottom:6px}ul.progresslist .pl-head b{color:var(--accent)}ul.progresslist .pl-bar{height:6px;border-radius:3px;background:rgba(255,255,255,.08);overflow:hidden;margin-bottom:4px}ul.progresslist .pl-bar i{display:block;height:100%;background:var(--accent)}ul.attemptlist{list-style:none;padding:0;margin:0 0 18px}ul.attemptlist li{display:grid;grid-template-columns:1fr auto auto;grid-gap:12px;gap:12px;align-items:baseline;padding:7px 0;border-top:1px solid rgba(255,255,255,.06);font-size:14px}ul.attemptlist b{color:var(--accent)}.wrap.stack{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:22px;min-height:0;padding:48px 24px}.wrap.stack .card{width:100%}.h2-lg{font-size:24px;margin:0 0 14px;line-height:1.25}ul.featlist{list-style:none;padding:0;margin:18px 0;display:grid;grid-gap:14px;gap:14px}ul.featlist li{padding:0 0 14px;border-bottom:1px solid rgba(255,255,255,.07);font-size:15px;line-height:1.6;color:var(--muted)}ul.featlist li:last-child{border-bottom:0;padding-bottom:0}ul.featlist strong{color:var(--fg);display:block;margin-bottom:3px}.pricebig{color:var(--accent);font-size:1.35em}details{border-top:1px solid rgba(255,255,255,.08);padding:12px 0}details:last-of-type{border-bottom:1px solid rgba(255,255,255,.08)}details summary{cursor:pointer;font-weight:600;font-size:15px;list-style-position:inside}details summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}details p{color:var(--muted);font-size:14.5px;line-height:1.65;margin:10px 0 2px}.card.legal{max-width:720px}.card.legal h2{margin:26px 0 8px;font-size:16px}.card.legal p{color:var(--muted);font-size:15px;line-height:1.7;margin:0 0 10px}.card.legal p.lede{font-size:17px}.card.legal a{color:var(--accent)}ul.correctionlist{list-style:none;padding:0;margin:18px 0 0;display:grid;grid-gap:16px;gap:16px}ul.correctionlist li{border-top:1px solid rgba(255,255,255,.08);padding-top:12px}.sitefooter{max-width:720px;margin:0 auto;padding:8px 24px 48px;text-align:center}.sitefooter nav{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 18px;margin-bottom:14px}.sitefooter a{color:var(--muted);font-size:13px;text-decoration:none}.sitefooter a:hover{color:var(--accent)}.sitefooter p{color:rgba(147,161,189,.55);font-size:12px;line-height:1.6;margin:0 0 8px}.reportbox{margin:-6px 0 20px}.linklike{background:none;border:0;color:var(--muted);cursor:pointer;font-size:13px;padding:0;text-decoration:underline;width:auto}.linklike:hover{color:var(--accent);filter:none}textarea{width:100%;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.12);border-radius:10px;color:var(--fg);font:inherit;font-size:15px;padding:10px 12px;resize:vertical}textarea:focus{outline:2px solid var(--accent);outline-offset:1px}.samples{display:grid;grid-gap:26px;gap:26px;margin-top:6px}.sample .prompt-sm{font-size:16px;font-weight:600;line-height:1.5;margin:0 0 12px}