/* ============================================
   META ADS AUTOMATION - DESIGN SYSTEM
   Professional SaaS Design (2025-2026)
   ============================================ */

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

/* === ROOT VARIABLES === */
:root {
  /* === COLOR SYSTEM === */

  /* Neutrals - Sophisticated Grays */
  --color-white: #FFFFFF;
  --color-gray-50: #FAFAFA;
  --color-gray-100: #F5F5F5;
  --color-gray-200: #E5E5E5;
  --color-gray-300: #D4D4D4;
  --color-gray-400: #A3A3A3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;

  /* Primary - Deep Professional Blue */
  --color-primary-50: #EFF6FF;
  --color-primary-100: #DBEAFE;
  --color-primary-200: #BFDBFE;
  --color-primary-300: #93C5FD;
  --color-primary-400: #60A5FA;
  --color-primary-500: #3B82F6;
  --color-primary-600: #2563EB;
  --color-primary-700: #1D4ED8;
  --color-primary-800: #1E40AF;
  --color-primary-900: #1E3A8A;

  /* Accent - Sophisticated Purple */
  --color-accent-50: #FAF5FF;
  --color-accent-100: #F3E8FF;
  --color-accent-200: #E9D5FF;
  --color-accent-300: #D8B4FE;
  --color-accent-400: #C084FC;
  --color-accent-500: #A855F7;
  --color-accent-600: #9333EA;
  --color-accent-700: #7E22CE;
  --color-accent-800: #6B21A8;
  --color-accent-900: #581C87;

  /* Success - Muted Green */
  --color-success-50: #F0FDF4;
  --color-success-100: #DCFCE7;
  --color-success-200: #BBF7D0;
  --color-success-500: #22C55E;
  --color-success-600: #16A34A;
  --color-success-700: #15803D;

  /* Warning - Sophisticated Amber */
  --color-warning-50: #FFFBEB;
  --color-warning-100: #FEF3C7;
  --color-warning-200: #FDE68A;
  --color-warning-500: #F59E0B;
  --color-warning-600: #D97706;
  --color-warning-700: #B45309;

  /* Error/Danger - Muted Red */
  --color-error-50: #FEF2F2;
  --color-error-100: #FEE2E2;
  --color-error-200: #FECACA;
  --color-error-500: #EF4444;
  --color-error-600: #DC2626;
  --color-error-700: #B91C1C;

  /* Info - Calm Blue */
  --color-info-50: #EFF6FF;
  --color-info-100: #DBEAFE;
  --color-info-500: #3B82F6;
  --color-info-600: #2563EB;
  --color-info-700: #1D4ED8;

  /* === LEGACY COMPATIBILITY (mapping old variables to new) === */
  --primary-color: var(--color-primary-600);
  --secondary-color: var(--color-success-600);
  --danger-color: var(--color-error-600);
  --warning-color: var(--color-warning-500);
  --success-color: var(--color-success-600);
  --dark-color: var(--color-gray-900);
  --light-color: var(--color-gray-50);
  --border-color: var(--color-gray-200);
  --text-color: var(--color-gray-600);
  --text-secondary: var(--color-gray-500);

  /* === TYPOGRAPHY === */

  /* Font Families */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
               Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Font Sizes (Type Scale) */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;

  /* === SPACING (8pt Grid) === */
  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  --space-32: 8rem;     /* 128px */

  /* === BORDER RADIUS === */
  --radius-none: 0;
  --radius-xs: 0.125rem;   /* 2px */
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-full: 9999px;

  /* === SHADOWS === */
  --shadow-none: none;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
               0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
               0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
               0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.3);
  --shadow-focus-error: 0 0 0 3px rgba(239, 68, 68, 0.3);

  /* === TRANSITIONS === */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* === 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 === */
.dark-mode {
  /* Backgrounds - Soft Blacks */
  --color-bg-primary: #0A0A0A;
  --color-bg-secondary: #141414;
  --color-bg-tertiary: #1F1F1F;
  --color-bg-hover: #2A2A2A;

  /* Borders */
  --color-border: #2A2A2A;
  --color-border-hover: #404040;

  /* Text - Desaturated */
  --color-text-primary: #E2E8F0;
  --color-text-secondary: #94A3B8;
  --color-text-tertiary: #64748B;
  --color-text-disabled: #475569;

  /* Adjusted Colors for Dark */
  --color-primary-400: #60A5FA;
  --color-primary-500: #3B82F6;
  --color-primary-600: #2563EB;

  --color-accent-400: #C084FC;
  --color-accent-500: #A855F7;

  --color-success-400: #4ADE80;
  --color-success-500: #22C55E;

  --color-warning-400: #FBBF24;
  --color-warning-500: #F59E0B;

  --color-error-400: #F87171;
  --color-error-500: #EF4444;

  /* Legacy Mapping for Dark Mode */
  --primary-color: var(--color-primary-500);
  --light-color: var(--color-bg-primary);
  --text-color: var(--color-text-primary);
  --text-secondary: var(--color-text-secondary);
  --border-color: var(--color-border);

  /* Adjusted Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4),
               0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5),
               0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6),
               0 10px 10px -5px rgba(0, 0, 0, 0.4);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
}

/* === BASE STYLES === */
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-color);
  background-color: var(--light-color);
  transition: background-color var(--transition-base),
              color var(--transition-base);
}

.dark-mode body {
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  color: var(--dark-color);
  line-height: var(--leading-tight);
  margin: 0;
}

.dark-mode h1,
.dark-mode h2,
.dark-mode h3,
.dark-mode h4,
.dark-mode h5,
.dark-mode h6 {
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

/* === SMOOTH TRANSITIONS === */
* {
  transition-property: background-color, border-color, color, fill, stroke;
  transition-duration: var(--transition-base);
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Exclude transitions for user interactions */
button, a, input, select, textarea {
  transition: background-color var(--transition-base),
              color var(--transition-base),
              border-color var(--transition-base),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}