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:root{--bg:#f5f4f9;--surface:#fff;--ink:#1c1930;--muted:#5d5a73;--line:#dcd9e8;--accent:#4a2fa0;--accent-ink:#fff;--accent-soft:#ece8fa;--good:#14653a;--good-soft:#e1f3e8;--bad:#a31c2b;--bad-soft:#fbe6e8;--focus:#1d6fe0}@media (prefers-color-scheme:dark){:root{--bg:#121021;--surface:#1b182e;--ink:#ece9f8;--muted:#a5a1bf;--line:#342f52;--accent:#a995f0;--accent-ink:#14102b;--accent-soft:#2a2450;--good:#7fd4a0;--good-soft:#17352a;--bad:#f3939f;--bad-soft:#3d1a22;--focus:#7db4ff}}*{box-sizing:border-box}html{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){html{--lightningcss-light: ;--lightningcss-dark:initial}}body{background:var(--bg);color:var(--ink);font-family:var(--font-geist-sans), system-ui, sans-serif;margin:0;padding-inline:16px;font-size:16px;line-height:1.5}main{max-width:720px;margin-inline:auto;padding-block:32px 64px}h1{text-wrap:balance;margin:0 0 8px;font-size:clamp(1.5rem,4vw,2rem);line-height:1.2}h2{margin:0 0 8px;font-size:1.125rem}p{margin:0 0 12px}a{color:var(--accent)}.muted{color:var(--muted)}.eyebrow{font-family:var(--font-geist-mono), monospace;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:8px;font-size:.75rem}.card{background:var(--surface);border:1px solid var(--line);border-radius:10px;margin-block:16px;padding:20px}.topbar{border-bottom:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px;padding-block:12px;display:flex}.topbar form{margin:0}button,.btn{font:inherit;cursor:pointer;border:1px solid var(--accent);background:var(--accent);min-height:44px;color:var(--accent-ink);border-radius:8px;padding:10px 18px;font-weight:600}button.secondary{color:var(--accent);background:0 0}button:disabled{opacity:.55;cursor:not-allowed}button:focus-visible,input:focus-visible,label.option:focus-within{outline:3px solid var(--focus);outline-offset:2px}.field{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}.field label{font-weight:600}input[type=email],input[type=text]{font:inherit;border:1px solid var(--line);background:var(--surface);width:100%;min-width:0;min-height:44px;color:var(--ink);border-radius:8px;padding:10px 12px}.error{color:var(--bad);background:var(--bad-soft);border-radius:8px;margin-block:12px;padding:10px 12px}.progress{background:var(--line);border-radius:999px;height:8px;margin:8px 0 4px;overflow:hidden}.progress>span{background:var(--accent);height:100%;display:block}.meta{color:var(--muted);flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:.875rem;display:flex}.stem{margin:16px 0 20px;font-size:1.1875rem;line-height:1.45}fieldset{border:0;gap:10px;margin:0;padding:0;display:grid}label.option{cursor:pointer;border:1px solid var(--line);background:var(--surface);border-radius:8px;grid-template-columns:28px 1fr;align-items:start;gap:10px;padding:12px 14px;display:grid}label.option input{width:18px;height:18px;accent-color:var(--accent);margin:4px 0 0}label.option .letter{font-family:var(--font-geist-mono), monospace;font-weight:600}label.option.selected{border-color:var(--accent);background:var(--accent-soft)}label.option.correct{border-color:var(--good);background:var(--good-soft)}label.option.wrong{border-color:var(--bad);background:var(--bad-soft)}label.option.locked{cursor:default}.flag{margin-left:4px;font-size:.875rem;font-weight:600}.flag.good{color:var(--good)}.flag.bad{color:var(--bad)}.feedback{border:1px solid var(--line);border-radius:8px;margin-top:20px;padding:16px}.feedback.good{border-color:var(--good);background:var(--good-soft)}.feedback.bad{border-color:var(--bad);background:var(--bad-soft)}.feedback h2{margin-bottom:6px}.feedback .src{color:var(--muted);margin:8px 0 0;font-size:.8125rem}.actions{flex-wrap:wrap;gap:10px;margin-top:16px;display:flex}.rules{margin:0 0 16px;padding-left:20px}.rules li{margin-bottom:6px}table{border-collapse:collapse;width:100%;font-size:.9375rem}th,td{text-align:left;border-bottom:1px solid var(--line);padding:8px 6px}th{text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-size:.75rem}.table-wrap{overflow-x:auto}.pill{border-radius:999px;padding:2px 10px;font-size:.8125rem;font-weight:600;display:inline-block}.pill.passed{background:var(--good-soft);color:var(--good)}.pill.failed{background:var(--bad-soft);color:var(--bad)}.pill.in_progress{background:var(--accent-soft);color:var(--accent)}@media (prefers-reduced-motion:no-preference){.progress>span{transition:width .25s}}