/* CSS Variables - Space Theme */
:root {
    /* Colors - Light Theme */
    --color-primary: #1a1a1a;        /* Dark Gray for text */
    --color-secondary: #4a4a4a;      /* Medium Gray */
    --color-accent: #0066cc;         /* Blue accent */
    --color-text-primary: #1a1a1a;   /* Dark text */
    --color-text-secondary: #666666; /* Gray text */
    --color-background: #ffffff;     /* White background */
    --color-surface: #f5f5f5;        /* Light gray surface */
    
    /* Payment Colors */
    --color-wechat: #07c160;         /* WeChat Green */
    --color-alipay: #1677ff;         /* Alipay Blue */
    
    /* Semantic Colors */
    --color-success: #4caf50;
    --color-error: #f44336;
    --color-warning: #ff9800;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.15);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.2);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Breakpoints (for reference in media queries) */
    --mobile: 0px;
    --tablet: 768px;
    --desktop: 1024px;
    --wide: 1440px;
    
    /* Layout */
    --max-width: 1200px;
    --nav-height: 64px;
}