/**
 * Dark Theme Design System for UK Escorts pSEO Directory
 * 
 * A sophisticated, premium dark theme that enhances user focus and conversion rates.
 * The color palette emphasizes contrast for readability while maintaining an elegant,
 * discreet aesthetic appropriate for the industry.
 */

/* CSS Custom Properties (Variables) */
:root {
  /* Color Palette */
  --bg-primary: #0a0a0a;           /* Main background */
  --bg-secondary: #1a1a1a;         /* Card backgrounds */
  --bg-tertiary: #252525;          /* Hover states */
  --bg-accent: #2a2a2a;            /* Highlight areas */
  --bg-overlay: rgba(10, 10, 10, 0.8); /* Overlay backgrounds */
  
  /* Text Colors */
  --text-primary: #ffffff;         /* Main text */
  --text-secondary: #b0b0b0;       /* Secondary text */
  --text-muted: #808080;           /* Muted text */
  --text-accent: #ff3366;          /* Accent/CTA text */
  --text-inverse: #0a0a0a;         /* Text on accent backgrounds */
  
  /* Accent Colors */
  --accent-primary: #ff3366;       /* Primary accent (CTA buttons) */
  --accent-secondary: #ff6b9d;     /* Secondary accent */
  --accent-tertiary: #c44569;      /* Tertiary accent */
  --accent-gold: #ffd700;          /* VIP/Premium accent */
  --accent-success: #4caf50;       /* Success states */
  --accent-warning: #ff9800;       /* Warning states */
  --accent-error: #f44336;         /* Error states */
  
  /* Border Colors */
  --border-primary: #333333;       /* Main borders */
  --border-secondary: #404040;     /* Secondary borders */
  --border-accent: #ff3366;        /* Accent borders */
  --border-focus: #ff3366;          /* Focus borders */
  
  /* Gradient Overlays */
  --gradient-primary: linear-gradient(135deg, #ff3366 0%, #ff6b9d 100%);
  --gradient-secondary: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
  --gradient-accent: linear-gradient(135deg, #ff3366 0%, #c44569 100%);
  --gradient-vip: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
  --gradient-hero: linear-gradient(135deg, rgba(255, 51, 102, 0.1) 0%, rgba(255, 107, 157, 0.1) 100%);
  
  /* Shadow Effects */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.4);
  --shadow-accent: 0 4px 15px rgba(255, 51, 102, 0.3);
  --shadow-glow: 0 0 20px rgba(255, 51, 102, 0.3);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-secondary: 'Playfair Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 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 */
  
  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  
  /* Spacing */
  --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 */
  
  /* Border Radius */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;   /* Full circle */
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* 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;
  --z-toast: 1080;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: var(--font-bold);
  line-height: 1.2;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
  line-height: 1.8;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-normal);
}

a:hover {
  color: var(--accent-secondary);
}

/* Layout Components */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section {
  padding: var(--space-20) 0;
}

/* Header Navigation */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-primary);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) 0;
}

.logo {
  font-family: var(--font-secondary);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.logo:hover {
  color: var(--accent-primary);
}

.nav-links {
  display: flex;
  gap: var(--space-8);
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: var(--font-medium);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.nav-link.active {
  color: var(--accent-primary);
  background: rgba(255, 51, 102, 0.1);
}

/* Phone CTA Components */
.phone-cta {
  background: var(--gradient-primary);
  color: var(--text-primary);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-accent);
  position: relative;
  overflow: hidden;
  min-height: 44px;
  min-width: 44px;
  border: none;
  cursor: pointer;
}

.phone-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.phone-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 6px 20px rgba(255, 51, 102, 0.4);
}

.phone-cta:hover::before {
  left: 100%;
}

.phone-cta.primary {
  font-size: var(--text-xl);
  padding: var(--space-4) var(--space-8);
  min-height: 60px;
}

.phone-cta.vip {
  background: var(--gradient-vip);
  color: var(--bg-primary);
}

.phone-cta.small {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  min-height: 40px;
}

.phone-cta.immediate {
  background: linear-gradient(135deg, #ff3366 0%, #ff1744 100%);
  animation: urgent-pulse 2s infinite;
}

.phone-icon {
  width: 20px;
  height: 20px;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

@keyframes urgent-pulse {
  0%, 100% { 
    box-shadow: var(--shadow-accent);
    transform: scale(1);
  }
  50% { 
    box-shadow: var(--shadow-glow);
    transform: scale(1.05);
  }
}

/* Hero Section */
.hero {
  background: var(--gradient-secondary);
  padding: var(--space-16) var(--space-4);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-hero);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-family: var(--font-secondary);
  font-size: var(--text-5xl);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  position: relative;
  z-index: 1;
}

.hero-subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
}

/* Card Components */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg);
}

.card:hover::before {
  transform: scaleX(1);
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Status Indicators */
.availability-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: var(--font-medium);
}

.availability-indicator.high {
  background: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.3);
  color: var(--accent-success);
}

.availability-indicator.medium {
  background: rgba(255, 152, 0, 0.1);
  border: 1px solid rgba(255, 152, 0, 0.3);
  color: var(--accent-warning);
}

.availability-indicator.low {
  background: rgba(244, 67, 54, 0.1);
  border: 1px solid rgba(244, 67, 54, 0.3);
  color: var(--accent-error);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  animation: blink 2s infinite;
}

.status-dot.available {
  background: var(--accent-success);
}

.status-dot.busy {
  background: var(--accent-warning);
}

.status-dot.offline {
  background: var(--accent-error);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Provider Cards */
.provider-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.provider-card.featured {
  border-color: var(--accent-gold);
  box-shadow: var(--shadow-lg), 0 8px 25px rgba(255, 215, 0, 0.2);
}

.provider-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg);
}

.provider-avatar {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.provider-info {
  flex: 1;
}

.provider-name {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.provider-details {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin-bottom: var(--space-2);
}

.provider-status {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  text-transform: uppercase;
}

.provider-status.available {
  background: rgba(76, 175, 80, 0.2);
  color: var(--accent-success);
}

.provider-status.busy {
  background: rgba(255, 152, 0, 0.2);
  color: var(--accent-warning);
}

/* City and Service Cards */
.city-card, .service-card, .area-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  min-height: 150px;
  display: block;
}

.city-card::before, .service-card::before, .area-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.city-card:hover, .service-card:hover, .area-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg);
}

.city-card:hover::before, .service-card:hover::before, .area-card:hover::before {
  transform: scaleX(1);
}

.city-card h3, .service-card h3, .area-card h3 {
  font-family: var(--font-secondary);
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.city-card p, .service-card p, .area-card p {
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.availability, .price {
  color: var(--accent-primary);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
}

/* FAQ Section */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  overflow: hidden;
}

.faq-item h3 {
  padding: var(--space-6);
  font-size: var(--text-lg);
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-normal);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item h3::after {
  content: '+';
  font-size: var(--text-xl);
  transition: transform var(--transition-normal);
}

.faq-item.open h3::after {
  transform: rotate(45deg);
}

.faq-item h3:hover {
  background: var(--bg-tertiary);
}

.faq-item p {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--text-secondary);
  line-height: 1.8;
  display: none;
}

.faq-item.open p {
  display: block;
}

/* Breadcrumbs */
.breadcrumbs {
  padding: var(--space-4) 0;
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

.breadcrumbs a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.breadcrumbs a:hover {
  color: var(--text-primary);
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  padding: var(--space-8) 0;
  text-align: center;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.footer-link:hover {
  color: var(--text-primary);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-primary { font-family: var(--font-primary); }
.font-secondary { font-family: var(--font-secondary); }
.font-mono { font-family: var(--font-mono); }

.font-light { font-weight: var(--font-light); }
.font-normal { font-weight: var(--font-normal); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent-primary); }

.bg-primary { background: var(--bg-primary); }
.bg-secondary { background: var(--bg-secondary); }
.bg-tertiary { background: var(--bg-tertiary); }

.border-primary { border-color: var(--border-primary); }
.border-accent { border-color: var(--border-accent); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.transition-fast { transition: all var(--transition-fast); }
.transition-normal { transition: all var(--transition-normal); }
.transition-slow { transition: all var(--transition-slow); }

/* Mobile Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .nav {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
  }
  
  .hero {
    padding: var(--space-8) var(--space-3);
  }
  
  .hero-title {
    font-size: var(--text-3xl);
  }
  
  .hero-subtitle {
    font-size: var(--text-lg);
  }
  
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
  
  .grid-auto-fit {
    grid-template-columns: 1fr;
  }
  
  .provider-card {
    flex-direction: column;
    text-align: center;
  }
  
  .provider-avatar {
    margin-bottom: var(--space-3);
  }
  
  .section {
    padding: var(--space-12) 0;
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--space-3);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--text-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--text-base);
  }
  
  .phone-cta.primary {
    font-size: var(--text-lg);
    padding: var(--space-3) var(--space-6);
    min-height: 50px;
  }
  
  .city-card, .service-card, .area-card {
    padding: var(--space-4);
    min-height: 120px;
  }
  
  .provider-card {
    padding: var(--space-4);
  }
}

/* Tablet Responsive Design */
@media (min-width: 769px) and (max-width: 1024px) {
  .grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  .provider-card {
    padding: var(--space-4);
  }
  
  .provider-avatar {
    width: 50px;
    height: 50px;
  }
}

/* Desktop Responsive Design */
@media (min-width: 1025px) {
  .hero {
    padding: var(--space-20) var(--space-4);
  }
  
  .hero-title {
    font-size: var(--text-6xl);
  }
  
  .grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

/* Large Desktop Responsive Design */
@media (min-width: 1440px) {
  .container {
    max-width: 1400px;
  }
  
  .hero-title {
    font-size: var(--text-6xl);
  }
}

/* Accessibility Features */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--accent-primary);
  color: var(--text-primary);
  padding: var(--space-2);
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: var(--z-tooltip);
}

.skip-link:focus {
  top: 6px;
}

.focus-visible:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --border-primary: #666666;
    --border-secondary: #808080;
    --text-secondary: #cccccc;
    --text-muted: #999999;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .phone-cta,
  .availability-indicator {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card {
    border: 1px solid #ccc;
    box-shadow: none;
  }
}

/* Performance Optimizations */
.will-change-transform {
  will-change: transform;
}

.will-change-opacity {
  will-change: opacity;
}

.gpu-accelerated {
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Loading States */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* Dark Mode Support for System Preference */
@media (prefers-color-scheme: dark) {
  /* Already in dark mode, no changes needed */
}

/* Light Mode Fallback (if needed) */
@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-primary: #dee2e6;
    --border-secondary: #ced4da;
  }
}