/* ==========================================
   CSS Variables - Design Tokens
   ========================================== */

:root {
  /* Colors */
  --color-primary: #FF6B35;
  --color-primary-dark: #E65A2E;
  --color-secondary: #4A90E2;
  --color-accent: #FFB800;
  
  /* Background Colors */
  --color-bg-light: #FFFFFF;
  --color-bg-gray: #F5F5F5;
  --color-bg-dark: #1a1a1a;
  --color-bg-overlay: rgba(0, 0, 0, 0.5);
  
  /* Text Colors */
  --color-text-dark: #333333;
  --color-text-gray: #666666;
  --color-text-light: #999999;
  --color-text-white: #FFFFFF;
  
  /* Border Colors */
  --color-border: #E0E0E0;
  --color-border-light: #F0F0F0;
  --color-border-accent: #FFD700;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-family-heading: var(--font-family);
  
  /* Font Sizes */
  --font-size-h1: 48px;
  --font-size-h2: 36px;
  --font-size-h3: 24px;
  --font-size-h4: 20px;
  --font-size-h5: 18px;
  --font-size-body: 16px;
  --font-size-small: 14px;
  --font-size-xs: 12px;
  
  /* Font Weights */
  --font-weight-light: 300;
  --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: 1.8;
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  --spacing-xxxl: 96px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-round: 50%;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* Breakpoints (for reference in media queries) */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-xxl: 1400px;
  
  /* Container */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-md);
}