/* CSS Custom Properties (Variables) */
:root {
  /* Sidebar */
  --sidebar-width: 220px;
  --sidebar-bg: #1e2d3d;
  --sidebar-bg-hover: rgba(255, 255, 255, 0.07);
  --sidebar-bg-active: rgba(255, 255, 255, 0.12);
  --sidebar-text: rgba(255, 255, 255, 0.75);
  --sidebar-text-hover: rgba(255, 255, 255, 0.95);
  --sidebar-text-active: #ffffff;
  --sidebar-border: rgba(255, 255, 255, 0.08);
  --sidebar-section-label: rgba(255, 255, 255, 0.4);

  /* Brand colors */
  --color-primary: #2b7be0;
  --color-primary-dark: #1d6ac9;
  --color-primary-light: #5096e8;

  /* Semantic colors */
  --color-secondary: #6b7280;
  --color-secondary-dark: #4b5563;
  --color-success: #059669;
  --color-success-bg: #d1fae5;
  --color-danger: #dc2626;
  --color-danger-bg: #fee2e2;
  --color-warning: #d97706;
  --color-warning-bg: #fef3c7;
  --color-info: #0891b2;
  --color-info-bg: #cffafe;
  --color-error: #dc2626;

  /* Neutrals */
  --color-text: #111827;
  --color-text-dark: #111827;
  --color-text-light: #6b7280;
  --color-text-muted: #9ca3af;
  --color-border: #e5e7eb;
  --color-background: #ffffff;
  --color-background-alt: #f9fafb;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;

  /* Spacing */
  --spacing-unit: 8px;
  --spacing-xs: calc(var(--spacing-unit) * 0.5);  /* 4px */
  --spacing-sm: var(--spacing-unit);               /* 8px */
  --spacing-md: calc(var(--spacing-unit) * 2);    /* 16px */
  --spacing-lg: calc(var(--spacing-unit) * 3);    /* 24px */
  --spacing-xl: calc(var(--spacing-unit) * 4);    /* 32px */

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;
  --font-family-base: var(--font-family);
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */
  --line-height: 1.5;

  /* Borders */
  --border-radius: 6px;
  --border-radius-sm: 4px;
  --border-radius-lg: 8px;
  --border-radius-full: 9999px;
  --border-width: 1px;
  --border-color: var(--color-border);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-speed: 0.15s;
  --transition-timing: ease;
}