/**
 * Enhanced Responsive Design for MAL Real Estate Search System
 * Mobile-first approach with advanced PWA features
 */

/* Base CSS Variables */
:root {
  /* Colors */
  --primary-color: #1e3a5f;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --error-color: #ef4444;
  --warning-color: #f59e0b;
  --success-color: #10b981;
  --info-color: #3b82f6;
  
  /* Neutral colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-family-mono: 'Fira Code', 'Monaco', 'Consolas', monospace;
  
  /* Font sizes - mobile first */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* 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;
}

/* Base styles */
* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--text-base);
  color: var(--gray-900);
  background-color: var(--gray-50);
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* Focus management for accessibility */
*:focus {
  outline: 2px solid var(--primary-light);
  outline-offset: 2px;
}

/* Button focus for better accessibility */
button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--primary-light);
  outline-offset: 2px;
}

/* Mobile-first responsive typography */
h1 { font-size: var(--text-2xl); font-weight: 700; line-height: 1.2; }
h2 { font-size: var(--text-xl); font-weight: 600; line-height: 1.3; }
h3 { font-size: var(--text-lg); font-weight: 600; line-height: 1.4; }
h4 { font-size: var(--text-base); font-weight: 600; line-height: 1.4; }
h5 { font-size: var(--text-sm); font-weight: 600; line-height: 1.4; }
h6 { font-size: var(--text-xs); font-weight: 600; line-height: 1.4; }

p { 
  margin: 0 0 var(--spacing-md) 0;
  line-height: 1.6;
}

/* Responsive images */
img {
  max-width: 100%;
  height: auto;
}

/* Enhanced container system */
.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Mobile-first breakpoints */
@media (min-width: 640px) {
  .container { max-width: 640px; padding: 0 var(--spacing-lg); }
  h1 { font-size: var(--text-3xl); }
  h2 { font-size: var(--text-2xl); }
}

@media (min-width: 768px) {
  .container { max-width: 768px; }
  h1 { font-size: var(--text-4xl); }
}

@media (min-width: 1024px) {
  .container { max-width: 1024px; padding: 0 var(--spacing-xl); }
}

@media (min-width: 1280px) {
  .container { max-width: 1280px; }
}

@media (min-width: 1536px) {
  .container { max-width: 1536px; }
}

/* Enhanced grid system */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }

@media (min-width: 640px) {
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .lg\:grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

/* Flexible layout utilities */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

.space-x-2 > * + * {
  margin-left: var(--spacing-sm);
}

.space-x-4 > * + * {
  margin-left: var(--spacing-md);
}

.space-y-2 > * + * {
  margin-top: var(--spacing-sm);
}

.space-y-4 > * + * {
  margin-top: var(--spacing-md);
}

/* Enhanced mobile navigation */
.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  border-top: 1px solid var(--gray-200);
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: var(--z-fixed);
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

.mobile-nav.active {
  transform: translateY(0);
}

.mobile-nav-item {
  flex: 1;
  text-align: center;
  padding: var(--spacing-sm);
  text-decoration: none;
  color: var(--gray-600);
  transition: color var(--transition-fast);
  font-size: var(--text-xs);
}

.mobile-nav-item.active,
.mobile-nav-item:hover {
  color: var(--primary-light);
}

.mobile-nav-item i {
  display: block;
  font-size: var(--text-lg);
  margin-bottom: var(--spacing-xs);
}

/* Enhanced button system */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  min-height: 44px; /* iOS accessibility requirement */
  min-width: 44px;
}

.btn-primary {
  background-color: var(--primary-light);
  color: white;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--primary-dark);
}

.btn-secondary {
  background-color: var(--gray-100);
  color: var(--gray-700);
}

.btn-secondary:hover,
.btn-secondary:focus {
  background-color: var(--gray-200);
}

.btn-success {
  background-color: var(--success-color);
  color: white;
}

.btn-danger {
  background-color: var(--error-color);
  color: white;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--text-xs);
  min-height: 36px;
  min-width: 36px;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--text-lg);
  min-height: 52px;
}

/* Disabled state */
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Enhanced form controls */
.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-base);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  background-color: white;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 44px; /* iOS accessibility */
}

.form-control:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control:invalid {
  border-color: var(--error-color);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--gray-700);
}

.form-help {
  font-size: var(--text-xs);
  color: var(--gray-500);
  margin-top: var(--spacing-xs);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--error-color);
  margin-top: var(--spacing-xs);
}

/* Enhanced card system */
.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--gray-200);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
  background-color: var(--gray-50);
}

/* Enhanced modal system */
.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal-backdrop);
}

.modal-content {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  z-index: var(--z-modal);
  transform: scale(0.95) translateY(-10px);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: scale(1) translateY(0);
}

/* Enhanced chat interface styles */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.chat-header {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  padding: var(--spacing-lg);
  flex-shrink: 0;
}

.chat-messages {
  flex: 1;
  padding: var(--spacing-md);
  overflow-y: auto;
  background-color: var(--gray-50);
  scroll-behavior: smooth;
}

.chat-input-area {
  padding: var(--spacing-md);
  background: white;
  border-top: 1px solid var(--gray-200);
  flex-shrink: 0;
}

.message-bubble {
  max-width: 80%;
  margin-bottom: var(--spacing-md);
  animation: messageSlideIn 0.3s ease-out;
}

.message-bubble.user {
  margin-left: auto;
}

.message-bubble.agent {
  margin-right: auto;
}

.message-content {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  word-wrap: break-word;
}

.message-bubble.user .message-content {
  background-color: var(--primary-light);
  color: white;
  border-bottom-right-radius: var(--radius-sm);
}

.message-bubble.agent .message-content {
  background-color: white;
  color: var(--gray-900);
  border: 1px solid var(--gray-200);
  border-bottom-left-radius: var(--radius-sm);
}

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

/* Enhanced loading states */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--gray-200);
  border-radius: 50%;
  border-top-color: var(--primary-light);
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.skeleton {
  animation: skeleton-loading 1.5s ease-in-out infinite alternate;
  background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Enhanced toast notifications */
.toast {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: white;
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border-left: 4px solid var(--primary-light);
  max-width: 400px;
  z-index: var(--z-toast);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  border-left-color: var(--success-color);
}

.toast.error {
  border-left-color: var(--error-color);
}

.toast.warning {
  border-left-color: var(--warning-color);
}

/* PWA-specific styles */
.pwa-install-banner {
  position: fixed;
  bottom: var(--spacing-md);
  left: var(--spacing-md);
  right: var(--spacing-md);
  background: var(--primary-color);
  color: white;
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-toast);
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

.pwa-install-banner.show {
  transform: translateY(0);
}

/* Offline indicator */
.offline-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--error-color);
  color: white;
  text-align: center;
  padding: var(--spacing-sm);
  font-size: var(--text-sm);
  z-index: var(--z-toast);
  transform: translateY(-100%);
  transition: transform var(--transition-normal);
}

.offline-indicator.show {
  transform: translateY(0);
}

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

@media (prefers-color-scheme: dark) {
  :root {
    --gray-50: #111827;
    --gray-100: #1f2937;
    --gray-200: #374151;
    --gray-300: #4b5563;
    --gray-400: #6b7280;
    --gray-500: #9ca3af;
    --gray-600: #d1d5db;
    --gray-700: #e5e7eb;
    --gray-800: #f3f4f6;
    --gray-900: #f9fafb;
  }
  
  body {
    background-color: var(--gray-50);
    color: var(--gray-900);
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn {
    border: 2px solid currentColor;
  }
  
  .form-control {
    border: 2px solid var(--gray-600);
  }
  
  .card {
    border: 1px solid var(--gray-600);
  }
}

/* Mobile-specific optimizations */
@media (max-width: 767px) {
  /* Larger touch targets */
  .btn {
    min-height: 48px;
    min-width: 48px;
  }
  
  /* Better spacing for mobile */
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  /* Stack elements vertically */
  .mobile-stack {
    flex-direction: column;
  }
  
  .mobile-stack > * {
    margin-left: 0 !important;
    margin-bottom: var(--spacing-sm);
  }
  
  /* Hide mobile-unfriendly elements */
  .mobile-hide {
    display: none !important;
  }
  
  /* Full width on mobile */
  .mobile-full {
    width: 100% !important;
  }
  
  /* Mobile modal adjustments */
  .modal {
    padding: var(--spacing-sm);
  }
  
  .modal-content {
    width: 100%;
    max-height: 95vh;
    margin: 0;
  }
  
  /* Mobile chat adjustments */
  .chat-messages {
    padding: var(--spacing-sm);
  }
  
  .message-bubble {
    max-width: 90%;
  }
  
  /* Mobile navigation adjustments */
  .mobile-nav {
    display: flex;
  }
}

/* Tablet optimizations */
@media (min-width: 768px) and (max-width: 1023px) {
  .tablet-adjust {
    padding: var(--spacing-md);
  }
  
  .message-bubble {
    max-width: 75%;
  }
}

/* Desktop optimizations */
@media (min-width: 1024px) {
  .desktop-only {
    display: block !important;
  }
  
  .mobile-nav {
    display: none;
  }
  
  /* Better hover states for desktop */
  .hover\:scale-105:hover {
    transform: scale(1.05);
  }
  
  .hover\:shadow-lg:hover {
    box-shadow: var(--shadow-lg);
  }
}

/* Print styles */
@media print {
  .no-print {
    display: none !important;
  }
  
  .print-full-width {
    width: 100% !important;
  }
  
  * {
    color: black !important;
    background: white !important;
  }
}

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none !important; }
.block { display: block !important; }
.inline-block { display: inline-block !important; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-scroll { overflow: scroll; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: 9999px; }

.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); }

.transition-all { transition: all var(--transition-normal); }
.transition-colors { transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast); }