:root{color-scheme:light dark;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--background-color);color:var(--text-color);--background-color: #f8fafc;--surface-color: #ffffff;--card-background: rgba(255, 255, 255, .92);--border-color: rgba(15, 23, 42, .08);--text-color: #0f172a;--muted-text: #475569;--primary-color: #2563eb;--primary-on: #ffffff;--secondary-surface: rgba(37, 99, 235, .08);--button-border: rgba(15, 23, 42, .12)}@media(prefers-color-scheme:dark){:root{--background-color: #020617;--surface-color: rgba(15, 23, 42, .92);--card-background: rgba(15, 23, 42, .94);--border-color: rgba(148, 163, 184, .14);--text-color: #e2e8f0;--muted-text: #94a3b8;--primary-color: #3b82f6;--primary-on: #020617;--secondary-surface: rgba(255, 255, 255, .06);--button-border: rgba(148, 163, 184, .18)}}*{box-sizing:border-box}html,body{margin:0;min-height:100%}body{display:flex;justify-content:center;align-items:center;padding:24px;background:radial-gradient(circle at top left,rgba(37,99,235,.12),transparent 28%),radial-gradient(circle at bottom right,rgba(59,130,246,.08),transparent 24%),var(--background-color);color:var(--text-color)}button,input{font:inherit}.app-shell{width:100%;max-width:760px;margin:0 auto;padding:24px}.card{width:100%;max-width:760px;display:grid;gap:24px;background:var(--card-background);border:1px solid var(--border-color);border-radius:28px;padding:32px;box-shadow:0 28px 80px #0f172a24}.card-heading{display:grid;gap:12px;text-align:center}.card-heading h1{margin:0;font-size:clamp(2rem,2.4vw,3rem);line-height:1.05}.card-heading p{margin:0;color:var(--muted-text);font-size:1rem;line-height:1.75}.tab-group{display:flex;gap:6px;padding:6px;background:var(--secondary-surface);border:1px solid 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