:root{--bg:#f9fafb;--bg-card:#fff;--bg-hover:#f3f4f6;--bg-input:#fff;--border:#d1d5db;--text:#111827;--text-secondary:#6b7280;--text-muted:#9ca3af;--primary:#2563eb;--primary-hover:#1d4ed8;--success:#16a34a;--danger:#dc2626;--shadow:#0000001a}[data-theme=dark]{--bg:#111827;--bg-card:#1f2937;--bg-hover:#374151;--bg-input:#374151;--border:#4b5563;--text:#f9fafb;--text-secondary:#9ca3af;--text-muted:#6b7280;--primary:#3b82f6;--primary-hover:#2563eb;--success:#22c55e;--danger:#ef4444;--shadow:#0000004d}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.5}.container{max-width:896px;margin:0 auto;padding:0 16px}h1{font-size:2.25rem;font-weight:700}h2{color:var(--text);font-size:1.125rem;font-weight:600}h3{color:var(--text-secondary);font-size:.875rem;font-weight:600}.btn{cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;padding:8px 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