/* ==========================================
   Design Tokens & Variables
   普慧康泰 - 设计令牌与变量系统
   ========================================== */

:root {
    /* Brand Colors - 华为风格：纯白灰 */
    --color-primary: #6B7280;
    --color-primary-dark: #4B5563;
    --color-primary-light: #9CA3AF;

    /* Neutral Colors */
    --color-black: #000000;
    --color-gray-900: #111827;
    --color-gray-800: #1F2937;
    --color-gray-700: #374151;
    --color-gray-600: #4B5563;
    --color-gray-500: #6B7280;
    --color-gray-400: #9CA3AF;
    --color-gray-300: #D1D5DB;
    --color-gray-200: #E5E7EB;
    --color-gray-100: #F3F4F6;
    --color-gray-50: #F9FAFB;
    --color-white: #FFFFFF;

    /* Background Colors - 只有白色和灰色 */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;

    /* Accent Colors - Logo绿色用于图标 */
    --color-green: #00BFA5;
    --color-green-dark: #009688;
    --color-green-light: #4DB6AC;
    --accent-gray: #6B7280;

    /* Typography - 华为风格：清晰简洁 */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
                       'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    --font-family-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
                          'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', 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: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Line Heights */
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing - 8px 基础单位系统 */
    --spacing-0: 0;
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    --spacing-28: 7rem;
    --spacing-32: 8rem;

    /* Layout */
    --max-width: 1440px;
    --header-height: 4.5rem;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Z-Index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Dark Mode Support (Future) */
@media (prefers-color-scheme: dark) {
    /* Dark mode variables can be added here when needed */
}