/**
 * ELEVATE ESTATE MANAGEMENT - DESIGN SYSTEM
 * Premium UK Property Business Design Tokens
 * Version 2.0 - Complete Redesign
 *
 * Themes: Light, Dark, System
 * Mobile-first, Accessible, SEO-optimized
 */

/* ============================================
   ROOT VARIABLES - LIGHT THEME (DEFAULT)
   ============================================ */
:root {
  /* Primary Brand Colors - Elegant Navy & Gold */
  --primary-900: #0a1929;
  --primary-800: #122840;
  --primary-700: #1a3a57;
  --primary-600: #234b6e;
  --primary-500: #2c5d85;
  --primary-400: #4a7ca3;
  --primary-300: #6899c0;
  --primary-200: #a4c4dd;
  --primary-100: #d1e5f4;
  --primary-50: #e8f3fa;

  /* Accent Colors - Premium Gold */
  --accent-900: #4d3800;
  --accent-800: #7a5a00;
  --accent-700: #a67c00;
  --accent-600: #d39e00;
  --accent-500: #ffc107;
  --accent-400: #ffcd38;
  --accent-300: #ffd969;
  --accent-200: #ffe69a;
  --accent-100: #fff2cb;
  --accent-50: #fffbeb;

  /* Neutral Colors */
  --neutral-900: #111827;
  --neutral-800: #1f2937;
  --neutral-700: #374151;
  --neutral-600: #4b5563;
  --neutral-500: #6b7280;
  --neutral-400: #9ca3af;
  --neutral-300: #d1d5db;
  --neutral-200: #e5e7eb;
  --neutral-100: #f3f4f6;
  --neutral-50: #f9fafb;
  --neutral-0: #ffffff;

  /* Semantic Colors */
  --success-600: #059669;
  --success-500: #10b981;
  --success-100: #d1fae5;

  --warning-600: #d97706;
  --warning-500: #f59e0b;
  --warning-100: #fef3c7;

  --error-600: #dc2626;
  --error-500: #ef4444;
  --error-100: #fee2e2;

  --info-600: #2563eb;
  --info-500: #3b82f6;
  --info-100: #dbeafe;

  /* Light Theme Specific */
  --bg-primary: var(--neutral-0);
  --bg-secondary: var(--neutral-50);
  --bg-tertiary: var(--neutral-100);
  --bg-elevated: var(--neutral-0);
  --bg-overlay: rgba(255, 255, 255, 0.95);

  --text-primary: var(--neutral-900);
  --text-secondary: var(--neutral-700);
  --text-tertiary: var(--neutral-500);
  --text-inverse: var(--neutral-0);

  --border-primary: var(--neutral-200);
  --border-secondary: var(--neutral-300);
  --border-hover: var(--primary-400);

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Premium Effects */
  --shadow-premium: 0 8px 30px rgba(10, 25, 41, 0.12), 0 4px 12px rgba(10, 25, 41, 0.08);
  --shadow-card-hover: 0 12px 40px rgba(10, 25, 41, 0.15), 0 6px 16px rgba(10, 25, 41, 0.1);
  --glow-accent: 0 0 20px rgba(255, 193, 7, 0.3);

  /* Typography Scale */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-family-heading: 'Montserrat', 'Inter', sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes - Fluid Typography */
  --text-xs: clamp(0.75rem, 0.7rem + 0.2vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.3vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.65rem + 1.125vw, 2.25rem);
  --text-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);
  --text-5xl: clamp(3rem, 2.5rem + 2.5vw, 3.75rem);
  --text-6xl: clamp(3.75rem, 3rem + 3.75vw, 4.5rem);

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

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

  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --space-40: 10rem;
  --space-48: 12rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 500ms cubic-bezier(0.4, 0, 0.1, 1);

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;

  /* Container Widths */
  --container-xs: 20rem;
  --container-sm: 24rem;
  --container-md: 28rem;
  --container-lg: 32rem;
  --container-xl: 36rem;
  --container-2xl: 42rem;
  --container-3xl: 48rem;
  --container-4xl: 56rem;
  --container-5xl: 64rem;
  --container-6xl: 72rem;
  --container-7xl: 80rem;
  --container-full: 100%;
}

/* ============================================
   DARK THEME
   ============================================ */
[data-theme="dark"] {
  /* Background Colors */
  --bg-primary: #0a0e14;
  --bg-secondary: #0f1419;
  --bg-tertiary: #151a21;
  --bg-elevated: #1a2029;
  --bg-overlay: rgba(10, 14, 20, 0.95);

  /* Text Colors */
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
  --text-inverse: #0a1929;

  /* Border Colors */
  --border-primary: #1f2937;
  --border-secondary: #374151;
  --border-hover: var(--primary-300);

  /* Adjusted Shadows for Dark Mode */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7), 0 8px 10px -6px rgba(0, 0, 0, 0.7);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
  --shadow-premium: 0 8px 30px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.6), 0 6px 16px rgba(0, 0, 0, 0.5);
  --glow-accent: 0 0 30px rgba(255, 193, 7, 0.4);
}

/* ============================================
   SYSTEM THEME - Auto-detect user preference
   ============================================ */
@media (prefers-color-scheme: dark) {
  [data-theme="system"] {
    /* Background Colors */
    --bg-primary: #0a0e14;
    --bg-secondary: #0f1419;
    --bg-tertiary: #151a21;
    --bg-elevated: #1a2029;
    --bg-overlay: rgba(10, 14, 20, 0.95);

    /* Text Colors */
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --text-inverse: #0a1929;

    /* Border Colors */
    --border-primary: #1f2937;
    --border-secondary: #374151;
    --border-hover: var(--primary-300);

    /* Adjusted Shadows for Dark Mode */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7), 0 8px 10px -6px rgba(0, 0, 0, 0.7);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
    --shadow-premium: 0 8px 30px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.6), 0 6px 16px rgba(0, 0, 0, 0.5);
    --glow-accent: 0 0 30px rgba(255, 193, 7, 0.4);
  }
}

/* ============================================
   COMPONENT-SPECIFIC TOKENS
   ============================================ */
:root {
  /* Buttons */
  --btn-primary-bg: var(--primary-600);
  --btn-primary-hover: var(--primary-700);
  --btn-primary-text: var(--neutral-0);

  --btn-accent-bg: var(--accent-500);
  --btn-accent-hover: var(--accent-600);
  --btn-accent-text: var(--neutral-900);

  --btn-outline-border: var(--primary-600);
  --btn-outline-text: var(--primary-600);
  --btn-outline-hover-bg: var(--primary-600);
  --btn-outline-hover-text: var(--neutral-0);

  /* Cards */
  --card-bg: var(--bg-elevated);
  --card-border: var(--border-primary);
  --card-shadow: var(--shadow-premium);
  --card-shadow-hover: var(--shadow-card-hover);

  /* Forms */
  --input-bg: var(--bg-primary);
  --input-border: var(--border-primary);
  --input-border-focus: var(--primary-500);
  --input-text: var(--text-primary);
  --input-placeholder: var(--text-tertiary);

  /* Navigation */
  --nav-bg: var(--bg-overlay);
  --nav-text: var(--text-primary);
  --nav-hover: var(--primary-500);
  --nav-shadow: var(--shadow-md);
}

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

/* Theme Toggle */
.theme-light { --theme: "light"; }
.theme-dark { --theme: "dark"; }
.theme-system { --theme: "system"; }

/* Container */
.container {
  width: 100%;
  max-width: var(--container-7xl);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 640px) {
  .container { padding-inline: var(--space-6); }
}

@media (min-width: 1024px) {
  .container { padding-inline: var(--space-8); }
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus Visible */
.focus-ring:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
  border-radius: var(--radius-md);
}

/* Premium Gradient */
.gradient-premium {
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-800) 100%);
}

.gradient-accent {
  background: linear-gradient(135deg, var(--accent-500) 0%, var(--accent-600) 100%);
}

.gradient-overlay {
  position: relative;
}

.gradient-overlay::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 25, 41, 0.9) 0%, rgba(44, 93, 133, 0.8) 100%);
  z-index: 1;
}

/* Glass Morphism */
.glass {
  background: var(--bg-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Animation Classes */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-fade-in { animation: fadeIn var(--transition-base) ease-out; }
.animate-fade-in-up { animation: fadeInUp var(--transition-base) ease-out; }
.animate-fade-in-down { animation: fadeInDown var(--transition-base) ease-out; }
.animate-scale-in { animation: scaleIn var(--transition-base) ease-out; }
.animate-slide-in-right { animation: slideInRight var(--transition-base) ease-out; }

/* Smooth Scroll */
html {
  scroll-behavior: smooth;
}

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