:root {
    /* 颜色系统 */
    --primary-darker: #1A365D;
    --primary: #2C5282;
    --primary-light: #4A5568;
    --primary-lighter: #E2E8F0;
    
    --accent: #ED8936;
    --accent-light: #FBD38D;
    
    --bg-gradient-1: #F7FAFC;
    --bg-gradient-2: #EDF2F7;
    
    --text-primary: #2D3748;
    --text-secondary: #4A5568;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
}