/* ============================================
   CSS Variables - Design System
   ============================================ */

:root {
  /* Colors - Primary */
  --color-primary: #00B8D4;
  --color-primary-dark: #0097A7;
  --color-primary-light: #B2EBF2;
  
  /* Colors - Semantic */
  --color-success: #4CAF50;
  --color-warning: #FF9800;
  --color-error: #F44336;
  --color-info: #2196F3;
  
  /* Colors - Backgrounds */
  --bg-page: #FAFAFA;
  --bg-card: #FFFFFF;
  --bg-dark: #1A1A1A;
  --bg-dark-secondary: #2D2D2D;
  --bg-terminal: #0B1021;
  --bg-hover: #F5F5F5;
  
  /* Colors - Text */
  --text-primary: #212121;
  --text-secondary: #757575;
  --text-disabled: #BDBDBD;
  --text-inverse: #FFFFFF;
  --text-terminal: #D2E3FF;
  
  /* Colors - Borders */
  --border-color: #E0E0E0;
  --border-color-dark: #424242;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.18);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Typography */
  --font-family: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-family-mono: "Consolas", "Monaco", "Courier New", monospace;
  
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Layout */
  --sidebar-width: 260px;
  --navbar-height: 64px;
  --max-content-width: 1400px;
  
  /* 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 (Optional)
   ============================================ */

@media (prefers-color-scheme: dark) {
  :root {
    --bg-page: #121212;
    --bg-card: #1E1E1E;
    --bg-hover: #2D2D2D;
    --text-primary: #E0E0E0;
    --text-secondary: #B0B0B0;
    --border-color: #424242;
  }
}