/* Design System - CSS Custom Properties & Utilities */

:root {
  /* Spacing Scale */
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Brand Colors */
  --color-brand-blue: #3d61df;
  --color-brand-red: #e81c72;
  --color-brand-green: #21dd90;
  --color-brand-gray: #9f9eb2;
  --color-brand-black: #151515;
  --color-brand-yellow: #f3b900;

  /* Neutral Colors */
  --color-gray-50: #fafbfc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #d1d5db;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #4b5563;
  --color-gray-900: #1a202c;

  /* Typography */
  --font-size-xs: 11px;
  --font-size-sm: 13px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 22px;
  --font-size-3xl: 28px;
  --font-size-4xl: 32px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0 8px 25px rgba(0, 0, 0, 0.12);
  --shadow-focus: 0 8px 25px rgba(61, 97, 223, 0.15);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s ease;
}

/* Utility Classes */
.u-grid-auto {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.u-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.u-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.u-grid-1 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.u-card {
  background: white;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
}

.u-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-gray-300);
}

.u-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Responsive Grid Utilities */
@media (max-width: 1024px) {
  .u-grid-3 {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }
}

@media (max-width: 768px) {
  .u-grid-3,
  .u-grid-2 {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .u-container {
    padding: 0 var(--space-md);
  }
}