:root{--color-primary: #3b82f6;--color-primary-dark: #2563eb;--color-primary-light: rgba(59, 130, 246, .2);--color-success: #10b981;--color-success-bg: rgba(16, 185, 129, .1);--color-error: #ef4444;--color-error-bg: rgba(239, 68, 68, .1);--color-bg: #f9fafb;--color-surface: #ffffff;--color-border: #e5e7eb;--color-text: #111827;--color-text-secondary: #6b7280;--color-text-tertiary: #9ca3af;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: 1rem;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1)}@media(prefers-color-scheme:dark){:root{--color-bg: #111827;--color-surface: #1f2937;--color-border: #374151;--color-text: #f9fafb;--color-text-secondary: #9ca3af;--color-text-tertiary: #6b7280;--color-success-bg: rgba(16, 185, 129, .15);--color-error-bg: rgba(239, 68, 68, .15)}}*,*:before,*:after{box-sizing:border-box}html{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;padding:0;background:var(--color-bg);color:var(--color-text);line-height:1.5}.btn{display:inline-flex;align-items:center;justify-content:center;padding:var(--space-3) var(--space-4);font-size:1rem;font-weight:500;border-radius:var(--radius-md);cursor:pointer;transition:all .15s ease;border:none}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-primary-dark)}.btn-secondary{background:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border)}.btn-secondary:hover:not(:disabled){background:var(--color-bg)}.btn-success{background:var(--color-success);color:#fff}.btn-success:hover:not(:disabled){opacity:.9}.btn-small{padding:var(--space-1) var(--space-2);font-size:.75rem}