:root{--bg: #f4f5fb;--card: #ffffff;--ink: #1f2233;--muted: #6b7280;--primary: #4f46e5;--primary-press: #4338ca;--ok: #16a34a;--weak: #d97706;--wrong: #dc2626;--line: #e5e7eb;--radius: 16px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,system-ui,sans-serif;font-size:18px;line-height:1.5;-webkit-font-smoothing:antialiased}.shell{max-width:430px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;padding:20px 18px 32px}.spacer{flex:1}h1{font-size:26px;margin:0 0 12px}h2{font-size:21px;margin:0 0 10px}p{margin:0 0 14px}.muted{color:var(--muted);font-size:15px}.center{text-align:center}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 1px 2px 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