:root {
    /* Colors */
    --color-primary: #c0392b;
    --color-primary-dark: #a93226;
    --color-primary-light: #e74c3c;
    --color-secondary: #e67e22;
    --color-accent: #f39c12;
    --color-bg: #fdf6f0;
    --color-bg-card: #ffffff;
    --color-bg-header: #8b0000;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-text-muted: #999999;
    --color-border: #e0d5c7;
    --color-link: #c0392b;
    --color-success: #27ae60;
    --color-warning: #f39c12;
    --color-error: #e74c3c;

    /* Typography */
    --font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-round: 50%;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

    /* Layout */
    --max-width: 1200px;
    --header-height: 60px;

    /* Breakpoints (reference) */
    --bp-sm: 480px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1200px;
}

/* Dark mode placeholder */
/* @media (prefers-color-scheme: dark) { ... } */