:root{--color-bg: #F2F2F7;--color-surface: #FFFFFF;--color-accent: #007AFF;--color-accent-text: #FFFFFF;--color-bubble-user: #007AFF;--color-bubble-agent: #E5E5EA;--color-text-primary: #1C1C1E;--color-text-secondary: #8E8E93;--color-border: #E5E5EA;--color-orange: #FF9500;--color-green: #34C759;--color-red: #FF3B30;--font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;--font-size-xs: 11px;--font-size-sm: 13px;--font-size-base: 15px;--font-size-lg: 17px;--font-size-xl: 20px;--space-xs: 4px;--space-sm: 8px;--space-md: 12px;--space-lg: 16px;--space-xl: 24px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--radius-bubble-user: 18px 18px 4px 18px;--radius-bubble-agent: 18px 18px 18px 4px;--nav-height-mobile: 48px;--nav-width-desktop: 220px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);font-size:var(--font-size-base);color:var(--color-text-primary);background:var(--color-bg);-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;border:none;background:none}