/**
 * AECS4U Design Tokens
 * Modern design system for Italian real estate platform
 * Version: 2.0.0
 * Date: 2025-10-04
 */

:root {
  /* ============================================================
     COLOR PALETTE
     ============================================================ */

  /* Primary Brand Colors - 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;  /* Main brand color */
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;
  --color-primary-950: #172554;

  /* Secondary Colors - Elegant Indigo */
  --color-secondary-50: #eef2ff;
  --color-secondary-100: #e0e7ff;
  --color-secondary-200: #c7d2fe;
  --color-secondary-300: #a5b4fc;
  --color-secondary-400: #818cf8;
  --color-secondary-500: #6366f1;
  --color-secondary-600: #4f46e5;
  --color-secondary-700: #4338ca;
  --color-secondary-800: #3730a3;
  --color-secondary-900: #312e81;

  /* Accent Colors - Italian Theme */
  --color-accent-green: #10b981;  /* Italian flag green */
  --color-accent-red: #ef4444;    /* Italian flag red */
  --color-accent-gold: #f59e0b;   /* Premium gold */

  /* Semantic Colors */
  --color-success-50: #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-500: #10b981;   /* Positive ROI, profit */
  --color-success-600: #059669;
  --color-success-700: #047857;
  --color-success-900: #064e3b;

  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-500: #f59e0b;   /* Medium risk, attention */
  --color-warning-600: #d97706;
  --color-warning-700: #b45309;
  --color-warning-900: #78350f;

  --color-danger-50: #fef2f2;
  --color-danger-100: #fee2e2;
  --color-danger-500: #ef4444;    /* High risk, loss */
  --color-danger-600: #dc2626;
  --color-danger-700: #b91c1c;
  --color-danger-900: #7f1d1d;

  --color-info-50: #ecfeff;
  --color-info-100: #cffafe;
  --color-info-500: #06b6d4;      /* Information */
  --color-info-600: #0891b2;
  --color-info-700: #0e7490;
  --color-info-900: #164e63;

  /* Neutral Colors - Gray Scale */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-gray-950: #030712;

  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: var(--color-gray-50);
  --color-bg-tertiary: var(--color-gray-100);
  --color-bg-dark: var(--color-gray-900);

  /* Text Colors */
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-tertiary: var(--color-gray-500);
  --color-text-muted: var(--color-gray-400);
  --color-text-inverse: #ffffff;

  /* Border Colors */
  --color-border-light: var(--color-gray-200);
  --color-border-medium: var(--color-gray-300);
  --color-border-dark: var(--color-gray-400);

  /* ============================================================
     TYPOGRAPHY
     ============================================================ */

  /* Font Families */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
               'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  --font-display: 'Lexend', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;

  /* Font Sizes */
  --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 */
  --text-6xl: 3.75rem;     /* 60px */
  --text-7xl: 4.5rem;      /* 72px */

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Letter Spacing */
  --tracking-tighter: -0.05em;
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;
  --tracking-widest: 0.1em;

  /* ============================================================
     SPACING SYSTEM (4px/8px 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-7: 1.75rem;      /* 28px */
  --space-8: 2rem;         /* 32px */
  --space-10: 2.5rem;      /* 40px */
  --space-12: 3rem;        /* 48px */
  --space-14: 3.5rem;      /* 56px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */
  --space-32: 8rem;        /* 128px */

  /* ============================================================
     SIZING SYSTEM
     ============================================================ */

  --size-full: 100%;
  --size-screen: 100vw;
  --size-min: min-content;
  --size-max: max-content;
  --size-fit: fit-content;

  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* ============================================================
     BORDER RADIUS
     ============================================================ */

  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius-base: 0.25rem;  /* 4px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;   /* Fully rounded */

  /* ============================================================
     SHADOWS (Elevation System)
     ============================================================ */

  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1),
               0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-base: 0 4px 6px -1px rgb(0 0 0 / 0.1),
                 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1),
               0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1),
               0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.4);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
  --shadow-none: none;

  /* Colored Shadows */
  --shadow-primary: 0 10px 15px -3px rgb(59 130 246 / 0.3);
  --shadow-success: 0 10px 15px -3px rgb(16 185 129 / 0.3);
  --shadow-warning: 0 10px 15px -3px rgb(245 158 11 / 0.3);
  --shadow-danger: 0 10px 15px -3px rgb(239 68 68 / 0.3);

  /* ============================================================
     Z-INDEX SYSTEM
     ============================================================ */

  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-auto: auto;

  /* Named Z-indexes */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-notification: 1080;

  /* ============================================================
     TRANSITIONS & ANIMATIONS
     ============================================================ */

  /* Durations */
  --duration-75: 75ms;
  --duration-100: 100ms;
  --duration-150: 150ms;
  --duration-200: 200ms;
  --duration-300: 300ms;
  --duration-500: 500ms;
  --duration-700: 700ms;
  --duration-1000: 1000ms;

  /* Timing Functions */
  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Transitions */
  --transition-base: all var(--duration-200) var(--ease-in-out);
  --transition-fast: all var(--duration-150) var(--ease-out);
  --transition-slow: all var(--duration-300) var(--ease-in-out);
  --transition-colors: color var(--duration-200) var(--ease-in-out),
                       background-color var(--duration-200) var(--ease-in-out),
                       border-color var(--duration-200) var(--ease-in-out);
  --transition-transform: transform var(--duration-200) var(--ease-in-out);
  --transition-opacity: opacity var(--duration-200) var(--ease-in-out);

  /* ============================================================
     BREAKPOINTS (for JavaScript)
     ============================================================ */

  --breakpoint-xs: 0px;
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

  /* ============================================================
     CUSTOM PROPERTIES FOR COMPONENTS
     ============================================================ */

  /* Buttons */
  --btn-padding-x: var(--space-4);
  --btn-padding-y: var(--space-2);
  --btn-border-radius: var(--radius-md);
  --btn-font-weight: var(--font-weight-medium);
  --btn-transition: var(--transition-colors);

  /* Cards */
  --card-padding: var(--space-6);
  --card-border-radius: var(--radius-xl);
  --card-border-width: 1px;
  --card-border-color: var(--color-border-light);
  --card-shadow: var(--shadow-sm);
  --card-shadow-hover: var(--shadow-md);

  /* Forms */
  --input-padding-x: var(--space-3);
  --input-padding-y: var(--space-2);
  --input-border-radius: var(--radius-md);
  --input-border-width: 1px;
  --input-border-color: var(--color-border-medium);
  --input-focus-border-color: var(--color-primary-500);
  --input-focus-ring: 0 0 0 3px var(--color-primary-100);

  /* Navigation */
  --navbar-height: 64px;
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 80px;

  /* Tables */
  --table-row-hover-bg: var(--color-gray-50);
  --table-border-color: var(--color-border-light);
  --table-header-bg: var(--color-gray-100);

  /* Property-Specific */
  --property-card-width: 320px;
  --property-card-aspect-ratio: 4 / 3;
  --property-image-height: 240px;
}

/* ============================================================
   DARK MODE OVERRIDES
   ============================================================ */

[data-theme="dark"] {
  /* Background Colors */
  --color-bg-primary: var(--color-gray-900);
  --color-bg-secondary: var(--color-gray-800);
  --color-bg-tertiary: var(--color-gray-700);

  /* Text Colors */
  --color-text-primary: var(--color-gray-50);
  --color-text-secondary: var(--color-gray-300);
  --color-text-tertiary: var(--color-gray-400);
  --color-text-muted: var(--color-gray-500);

  /* Border Colors */
  --color-border-light: var(--color-gray-700);
  --color-border-medium: var(--color-gray-600);
  --color-border-dark: var(--color-gray-500);

  /* Component Overrides */
  --card-border-color: var(--color-gray-700);
  --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
  --card-shadow-hover: 0 10px 15px -3px rgb(0 0 0 / 0.4);

  --table-row-hover-bg: var(--color-gray-800);
  --table-border-color: var(--color-gray-700);
  --table-header-bg: var(--color-gray-800);

  --input-border-color: var(--color-gray-600);
  --input-focus-ring: 0 0 0 3px rgb(59 130 246 / 0.2);
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */

/* Text Colors */
.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-muted { color: var(--color-text-muted); }
.text-inverse { color: var(--color-text-inverse); }

/* Brand Colors */
.text-brand-primary { color: var(--color-primary-600); }
.text-success { color: var(--color-success-600); }
.text-warning { color: var(--color-warning-600); }
.text-danger { color: var(--color-danger-600); }
.text-info { color: var(--color-info-600); }

/* Background Colors */
.bg-primary { background-color: var(--color-primary-500); }
.bg-secondary { background-color: var(--color-secondary-500); }
.bg-success { background-color: var(--color-success-500); }
.bg-warning { background-color: var(--color-warning-500); }
.bg-danger { background-color: var(--color-danger-500); }
.bg-info { background-color: var(--color-info-500); }

/* Light Background Colors */
.bg-primary-light { background-color: var(--color-primary-50); }
.bg-success-light { background-color: var(--color-success-50); }
.bg-warning-light { background-color: var(--color-warning-50); }
.bg-danger-light { background-color: var(--color-danger-50); }
.bg-info-light { background-color: var(--color-info-50); }

/* Shadows */
.shadow-xs { box-shadow: var(--shadow-xs); }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-base); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-2xl { box-shadow: var(--shadow-2xl); }
.shadow-none { box-shadow: var(--shadow-none); }

/* Border Radius */
.rounded-none { border-radius: var(--radius-none); }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius-base); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-3xl { border-radius: var(--radius-3xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Transitions */
.transition-base { transition: var(--transition-base); }
.transition-fast { transition: var(--transition-fast); }
.transition-slow { transition: var(--transition-slow); }
.transition-colors { transition: var(--transition-colors); }
.transition-transform { transition: var(--transition-transform); }
.transition-opacity { transition: var(--transition-opacity); }

/* ============================================================
   RESPONSIVE UTILITIES
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   PRINT STYLES
   ============================================================ */

@media print {
  :root {
    --color-bg-primary: #ffffff;
    --color-text-primary: #000000;
    --shadow-base: none;
    --shadow-md: none;
    --shadow-lg: none;
  }
}