@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* Colors - Primary (indigo) */
  --color-primary-50: #eef2ff;
  --color-primary-100: #e0e7ff;
  --color-primary-200: #c7d2fe;
  --color-primary-300: #a5b4fc;
  --color-primary-400: #818cf8;
  --color-primary-500: #6366f1;
  --color-primary-600: #4f46e5;
  --color-primary-700: #4338ca;
  --color-primary-800: #3730a3;
  --color-primary-900: #312e81;

  /* Colors - Slate (premium cool-gray palette) */
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  /* Colors - Success */
  --color-success-50: #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;

  /* Colors - Warning */
  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;

  /* Colors - Error */
  --color-error-50: #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;

  /* Colors - Info */
  --color-info-50: #eff6ff;
  --color-info-100: #dbeafe;
  --color-info-500: #3b82f6;
  --color-info-600: #2563eb;

  /* Semantic colors */
  --color-bg: #ffffff;
  --color-bg-secondary: var(--color-gray-50);
  --color-bg-tertiary: var(--color-gray-100);
  --color-text: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-400);
  --color-border: var(--color-gray-200);
  --color-border-focus: var(--color-primary-500);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;

  --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-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: 1.625;

  /* Spacing */
  --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;

  /* Border radius — modern, generously rounded */
  --radius-sm: 0.3125rem;   /* 5px */
  --radius-md: 0.5rem;      /* 8px */
  --radius-lg: 0.75rem;     /* 12px */
  --radius-xl: 1rem;        /* 16px */
  --radius-2xl: 1.25rem;    /* 20px */
  --radius-full: 9999px;

  /* Shadows — tinted depth */
  --shadow-xs: 0 1px 2px rgb(15 23 42 / 0.04);
  --shadow-sm: 0 1px 3px rgb(15 23 42 / 0.06), 0 1px 2px rgb(15 23 42 / 0.04);
  --shadow-md: 0 4px 8px -2px rgb(15 23 42 / 0.08), 0 2px 4px -2px rgb(15 23 42 / 0.05);
  --shadow-lg: 0 12px 20px -4px rgb(15 23 42 / 0.1), 0 4px 8px -4px rgb(15 23 42 / 0.06);
  --shadow-xl: 0 24px 40px -8px rgb(15 23 42 / 0.14), 0 8px 16px -6px rgb(15 23 42 / 0.08);
  --shadow-2xl: 0 32px 64px -12px rgb(15 23 42 / 0.22);

  /* Gradients */
  --gradient-primary: linear-gradient(180deg, #5c6af6 0%, #4f46e5 100%);
  --gradient-primary-hover: linear-gradient(180deg, #5060f4 0%, #4338ca 100%);
  --gradient-sidebar: linear-gradient(180deg, #0d1424 0%, #0f172a 100%);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-toast: 400;
  --z-tooltip: 500;

  /* Layout */
  --sidebar-width: 240px;
  --navbar-height: 64px;
  --content-max-width: 1280px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: var(--color-gray-900);
    --color-bg-secondary: var(--color-gray-800);
    --color-bg-tertiary: var(--color-gray-700);
    --color-text: var(--color-gray-100);
    --color-text-secondary: var(--color-gray-300);
    --color-text-muted: var(--color-gray-500);
    --color-border: var(--color-gray-700);
  }
}

/* Light mode override class */
.theme-light {
  --color-bg: #ffffff;
  --color-bg-secondary: var(--color-gray-50);
  --color-bg-tertiary: var(--color-gray-100);
  --color-text: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-400);
  --color-border: var(--color-gray-200);
}