:root {
    /* ========== 边框变量 ========== */
    --border-width-none: 0;
    --border-width-thin: 1px;
    --border-width-medium: 2px;
    --border-width-thick: 3px;
    --border-radius-none: 0;
    --border-radius-sm: 3px;
    --border-radius-md: 4px;
    --border-radius-lg: 8px;
    --border-radius-xl: 12px;
    --border-radius-2xl: 16px;
    --border-radius-full: 9999px;
    --border-style-solid: solid;
    --border-style-dashed: dashed;
    --border-style-dotted: dotted;
    --border-input: var(--border-width-thin) var(--border-style-solid) var(--color-border-default);
    --border-button: var(--border-width-thin) var(--border-style-solid) var(--color-primary-border);
    --border-card: var(--border-width-thin) var(--border-style-solid) var(--color-border-default);

    /* ========== 颜色变量 ========== */
    --color-primary: #f0c14b;
    --color-primary-light: #f4d078;
    --color-primary-dark: #e7b92e;
    --color-primary-border: #a88734;
    --color-text-primary: #111;
    --color-text-secondary: #767676;
    --color-text-tertiary: #a6a6a6;
    --color-text-disabled: #c7c7c7;
    --color-text-dark: #1e293b;
    --color-text-muted: #475569;
    --color-text-placeholder: #9ca3af;
    --color-text-light: #f1f5f9;
    --color-text-light-secondary: #cbd5e1;
    --color-bg-primary: #fff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #e7e7e7;
    --color-bg-dark: #232f3e;
    --color-bg-dark-secondary: #1e293b;
    --color-bg-dark-tertiary: #334155;
    --color-border-default: #ddd;
    --color-border-emphasis: #a6a6a6;
    --color-border-focus: #e77600;
    --color-border-light: #e5e7eb;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-accent-light: rgba(59, 130, 246, 0.05);
    --color-accent-medium: rgba(59, 130, 246, 0.1);
    --color-accent-dark: rgba(59, 130, 246, 0.15);
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-error: #dc3545;
    --color-error-hover: #ef4444;
    --color-error-light: rgba(239, 68, 68, 0.05);
    --color-info: #17a2b8;
    --color-link: #0066c0;
    --color-link-hover: #c45500;
    --color-link-visited: #551a8b;

    /* ========== 其他变量 ========== */
    --scrollbar-thumb: #a2adb7;
    --scrollbar-thumb-hover: #8590a5;
    --scrollbar-track: transparent;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2;
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;

    /* ========== 阴影变量 ========== */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
    --shadow-focus: 0 0 3px 2px rgba(228, 121, 17, 0.5);
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-none: none;
    --shadow-card: var(--shadow-md);
    --shadow-button: var(--shadow-sm);
    --shadow-modal: var(--shadow-xl);
    --shadow-dropdown: var(--shadow-lg);

    /* ========== 间距变量 ========== */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-component-padding: var(--spacing-md);
    --spacing-component-gap: var(--spacing-sm);
    --spacing-section-margin: var(--spacing-xl);
    --spacing-container-padding: var(--spacing-md);
    --spacing-container-max-width: 1200px;
    --spacing-grid-gap: var(--spacing-md);

    /* ========== 字体变量 ========== */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-family-mono: 'Courier New', Courier, monospace;
    --font-family-serif: Georgia, 'Times New Roman', 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: 1.75rem;
    --font-size-4xl: 2rem;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

}