:root{--color-bg: #f8f9fa;--color-surface: #ffffff;--color-border: #e5e7eb;--color-text-primary: #111827;--color-text-secondary: #6b7280;--color-text-muted: #9ca3af;--color-accent: #4f46e5;--color-accent-hover: #4338ca;--color-accent-subtle: #eef2ff;--color-accent-ring: rgba(79, 70, 229, .2);--color-code-bg: #f3f4f6;--color-success: #059669;--color-success-subtle: #d1fae5;--color-error: #dc2626;--color-error-subtle: #fee2e2;--color-muted-subtle: #f3f4f6}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background:var(--color-bg);color:var(--color-text-primary);line-height:1.5}h1,h2,h3{line-height:1.2}button{font-family:inherit}