*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--primary: #6366f1;--primary-dark: #4f46e5;--bg: #0f172a;--bg-card: #1e293b;--bg-input: #334155;--text: #f1f5f9;--text-muted: #94a3b8;--border: #475569;--success: #22c55e;--warning: #f59e0b;--danger: #ef4444;--radius: 8px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}a{color:var(--primary);text-decoration:none}button{cursor:pointer;border:none;border-radius:var(--radius);padding:10px 20px;font-size:.95rem;font-weight:600;transition:background .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:var(--bg-input);color:var(--text)}.btn-secondary:hover{background:var(--border)}.btn-danger{background:var(--danger);color:#fff}.btn-small{padding:6px 14px;font-size:.85rem}input,textarea,select{background:var(--bg-input);color:var(--text);border:1px solid 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8px;text-align:center}.sim-results{margin-top:8px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:flex-start;justify-content:center;padding-top:40px;z-index:1000;overflow-y:auto}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes spin{to{transform:rotate(360deg)}}.spinner{width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}.divider{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--text-muted);font-size:.85rem}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--border)}