:root{--primary: #2563eb;--primary-hover: #1d4ed8;--bg-app: #f1f5f9;--bg-card: #ffffff;--text-main: #0f172a;--text-muted: #64748b;--border: #e2e8f0;--success: #10b981;--error: #ef4444;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--spacing-xs: .5rem;--spacing-sm: .75rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-app);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased}button{cursor:pointer;border:none;font-family:inherit}input,textarea{font-family:inherit}.container{width:100%;max-width:800px;margin:0 auto;padding:0 var(--spacing-md)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.75rem 1.5rem;border-radius:var(--radius-md);font-weight:600;font-size:1rem;transition:background-color .2s}.btn-primary{background-color:var(--primary);color:#fff;width:100%}.btn-primary:hover{background-color:var(--primary-hover)}.btn-primary:disabled{background-color:var(--text-muted);cursor:not-allowed;opacity:.7}.btn-secondary{background-color:transparent;color:var(--primary);border:1px solid var(--primary)}.btn-secondary:hover{background-color:#eff6ff}.card{background-color:var(--bg-card);border-radius:var(--radius-lg);box-shadow:0 1px 3px rgba(0,0,0,.1),0 1px 2px -1px rgba(0,0,0,.1);padding:var(--spacing-lg);border:1px solid var(--border)}.text-center{text-align:center}.mt-4{margin-top:1rem}.mb-4{margin-bottom:1rem}.flex-col{display:flex;flex-direction:column;gap:var(--spacing-md)}