:root {
  /* Color Palette */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --accent: #f59e0b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-dark: #0f172a;
  --bg-dark-secondary: #1e293b;
  --bg-dark-tertiary: #334155;
  
  /* Text Colors */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #ffffff;
  --text-light-muted: #cbd5e1;
  
  /* Border Colors */
  --border-light: #e2e8f0;
  --border-dark: #475569;
  
  /* 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);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #e2e8f0;
  --text-muted: #cbd5e1;
  --border-light: #475569;
}

/* Weather-specific body classes for dynamic styling */
body.weather-rain {
  background: linear-gradient(135deg, #1e40af, #3b82f6);
}

body.weather-snow {
  background: linear-gradient(135deg, #64748b, #94a3b8);
}

body.weather-storm {
  background: linear-gradient(135deg, #1e293b, #475569);
}

body.weather-fog {
  background: linear-gradient(135deg, #64748b, #94a3b8);
}

body.weather-haze {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
}

body.weather-clear-day {
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
}

body.weather-clear-night {
  background: linear-gradient(135deg, #0f172a, #1e293b);
}

body.night {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #e2e8f0;
  --text-muted: #cbd5e1;
  --border-light: #475569;
}

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

html, body {
  height: 100%;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Loading Screen */
.loading {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  z-index: 9999;
  backdrop-filter: blur(10px);
}

.loading.hidden {
  display: none;
}

.loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: center;
}

.loader-icon {
  font-size: 3rem;
  color: var(--primary);
  animation: pulse 2s ease-in-out infinite;
}

.loader p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.loader-bar {
  width: 200px;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.loader-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: var(--radius-sm);
  animation: progress 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes progress {
  0% { width: 0%; }
  50% { width: 70%; }
  100% { width: 100%; }
}

/* Enhanced animations and transitions */
@keyframes slideInFromLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

/* App Layout */
.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
  z-index: 100;
  animation: slideInFromLeft 0.3s ease-out;
}

.sidebar-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--primary);
}

.logo i {
  font-size: 1.5rem;
}

.logo h1 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.25rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.sidebar-nav {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.nav-section {
  margin-bottom: var(--spacing-xl);
}

.nav-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.nav-section ul {
  list-style: none;
}

.nav-section li {
  margin-bottom: var(--spacing-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  font-weight: 500;
  position: relative;
  overflow: hidden;
}

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

.nav-link.active {
  background: var(--primary);
  color: var(--text-light);
}

.nav-link i {
  width: 20px;
  text-align: center;
}

.nav-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 100%;
  background: var(--primary);
  transition: width var(--transition-normal);
  z-index: -1;
}

.nav-link:hover::before {
  width: 100%;
}

.nav-link.active::before {
  width: 100%;
}

/* Enhanced unit toggle */
.unit-toggle {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 2px;
  margin: var(--spacing-sm) 0;
  position: relative;
  overflow: hidden;
}

.unit {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.unit.active {
  background: var(--primary);
  color: var(--text-light);
}

.unit:hover:not(.active) {
  background: var(--bg-primary);
  color: var(--text-primary);
}

.unit-toggle::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, transparent, rgba(37, 99, 235, 0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.unit-toggle:hover::before {
  opacity: 1;
}

/* Language Select */
#langSelect {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

#langSelect:focus {
  outline: none;
  border-color: var(--primary);
}

/* Theme Toggle */
.theme-toggle {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary);
}

.theme-toggle::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, transparent, rgba(245, 158, 11, 0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.theme-toggle:hover::before {
  opacity: 1;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Top Bar */
.top-bar {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.search-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 400px;
  transition: all var(--transition-normal);
}

.search-box:focus-within {
  transform: scale(1.02);
}

.search-box:focus-within #cityInput {
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.15);
}

.search-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.875rem;
}

#cityInput {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 2.5rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

#cityInput:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--bg-primary);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.voice-btn {
  position: absolute;
  right: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.voice-btn:hover {
  color: var(--primary);
  background: var(--bg-tertiary);
}

.search-btn, .location-btn, .action-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  position: relative;
  overflow: hidden;
}

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

.search-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.search-btn::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 0.5s;
}

.search-btn:hover::before {
  left: 100%;
}

.location-btn {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.location-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary);
}

.location-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
  transition: left 0.4s;
}

.location-btn:hover::before {
  left: 100%;
}

/* API Key Notice */
.api-key-notice {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border: 1px solid #f59e0b;
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.9rem;
  color: #92400e;
  box-shadow: var(--shadow-sm);
}

.api-key-notice i {
  color: #f59e0b;
  font-size: 1.1rem;
}

.api-key-notice code {
  background: rgba(255, 255, 255, 0.5);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
}

.api-notice-actions {
  margin-left: auto;
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.api-test-btn {
  background: #10b981;
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.api-test-btn:hover {
  background: #059669;
  transform: translateY(-1px);
}

.api-link {
  background: #f59e0b;
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.api-link:hover {
  background: #d97706;
  transform: translateY(-1px);
}

.user-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.action-btn {
  padding: var(--spacing-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
}

.action-btn:hover {
  background: var(--bg-tertiary);
  color: var(--primary);
  border-color: var(--primary);
}

.action-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
  transition: left 0.4s;
}

.action-btn:hover::before {
  left: 100%;
}

/* Content Wrapper */
.content-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
}

.content-section {
  display: none;
  animation: fadeInUp 0.4s ease-out;
}

.content-section.active {
  display: block;
}

/* Section Headers */
.section-header {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.section-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.section-header p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Weather Hero */
.weather-hero {
  background: linear-gradient(135deg, var(--primary), var(--info));
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl);
  color: var(--text-light);
  margin-bottom: var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

.weather-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.3;
}

.weather-hero::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.weather-info {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.location-info h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.time-display {
  font-size: 0.875rem;
  opacity: 0.9;
  margin-bottom: var(--spacing-sm);
}

.weather-description {
  font-size: 1.125rem;
  font-weight: 500;
  opacity: 0.9;
}

.temperature-display {
  text-align: center;
}

.main-temp {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.feels-like {
  font-size: 1rem;
  opacity: 0.9;
}

.weather-icon {
  text-align: right;
}

.weather-icon-img, .lottie-container {
  width: 80px;
  height: 80px;
  object-fit: contain;
}

/* Weather Details */
.weather-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.detail-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.detail-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, transparent, rgba(255,255,255,0.05), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.detail-card:hover::before {
  transform: translateX(100%);
}

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

.detail-card i {
  font-size: 1.25rem;
  opacity: 0.8;
}

.detail-card div {
  display: flex;
  flex-direction: column;
}

.detail-label {
  font-size: 0.75rem;
  opacity: 0.8;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
}

.detail-value {
  font-size: 1.125rem;
  font-weight: 600;
}

/* Alert Banner */
.alert-banner {
  background: var(--danger);
  color: var(--text-light);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  text-align: center;
  font-weight: 500;
}

.alert-banner.hidden {
  display: none;
}

/* Insight Card */
.insight-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.insight-card i {
  color: var(--accent);
  font-size: 1.25rem;
}

.insight-text {
  color: var(--text-secondary);
  font-style: italic;
}

/* Hourly Timeline */
.hourly-timeline {
  display: flex;
  gap: var(--spacing-md);
  overflow-x: auto;
  padding: var(--spacing-md) 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border-light) transparent;
}

.hourly-timeline::-webkit-scrollbar {
  height: 6px;
}

.hourly-timeline::-webkit-scrollbar-track {
  background: transparent;
}

.hourly-timeline::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: var(--radius-sm);
}

.hour-card {
  min-width: 120px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  position: relative;
}

.hour-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  background: var(--primary);
  transition: all var(--transition-normal);
  transform: translateX(-50%);
}

.hour-card:hover::after {
  width: 80%;
}

.hour-card:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

/* Forecast Grid */
.forecast-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.forecast-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.forecast-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
  transition: left 0.6s;
}

.forecast-card:hover::before {
  left: 100%;
}

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

.forecast-card img {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-md);
}

/* Map Container */
.map-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.map-container:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

#map {
  height: 400px;
  width: 100%;
}

/* Chart Container */
.chart-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  position: relative;
}

.chart-container:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* AQI Details */
.aqi-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.aqi-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.aqi-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, transparent, rgba(16, 185, 129, 0.1), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.aqi-card:hover::before {
  opacity: 1;
}

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

.aqi-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.aqi-header i {
  font-size: 1.5rem;
  color: var(--success);
}

.aqi-header h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.aqi-value {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: var(--spacing-md);
}

.aqi-description {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Search History */
.search-history {
  margin-top: var(--spacing-lg);
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.search-history button {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.search-history button:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary);
  color: var(--text-primary);
}

.search-history button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
  transition: left 0.4s;
}

.search-history button:hover::before {
  left: 100%;
}

.search-history button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: 1000;
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .sidebar-toggle {
    display: block;
  }
  
  .weather-info {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-lg);
  }
  
  .weather-icon {
    text-align: center;
  }
  
  .weather-details {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}

/* Enhanced Mobile Responsiveness */
@media (max-width: 768px) {
  .top-bar {
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
  }
  
  .search-container {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .search-box {
    max-width: none;
    order: 1;
  }
  
  .search-btn, .location-btn {
    order: 2;
    width: 100%;
    justify-content: center;
  }
  
  .user-actions {
    order: 3;
    justify-content: center;
    gap: var(--spacing-sm);
  }
  
  .action-btn {
    width: 48px;
    height: 48px;
  }
  
  .weather-hero {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
  }
  
  .weather-info {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .main-temp {
    font-size: 3.5rem;
    line-height: 1;
  }
  
  .location-info h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
  }
  
  .weather-description {
    font-size: 1rem;
  }
  
  .weather-details {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }
  
  .detail-card {
    padding: var(--spacing-md);
  }
  
  .detail-value {
    font-size: 1rem;
  }
  
  .hourly-timeline {
    gap: var(--spacing-sm);
  }
  
  .hour-card {
    min-width: 100px;
    padding: var(--spacing-md);
  }
  
  .forecast-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
  
  .forecast-card {
    padding: var(--spacing-md);
  }
  
  .section-header h3 {
    font-size: 1.25rem;
  }
  
  .section-header p {
    font-size: 0.8rem;
  }
  
  .api-key-notice {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .api-notice-actions {
    margin-left: 0;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .content-wrapper {
    padding: var(--spacing-sm);
  }
  
  .top-bar {
    padding: var(--spacing-sm);
  }
  
  .weather-hero {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
  }
  
  .main-temp {
    font-size: 3rem;
  }
  
  .location-info h2 {
    font-size: 1.5rem;
  }
  
  .weather-details {
    grid-template-columns: 1fr;
  }
  
  .forecast-grid {
    grid-template-columns: 1fr;
  }
  
  .hour-card {
    min-width: 90px;
    padding: var(--spacing-sm);
  }
  
  .hour-card img {
    width: 36px !important;
  }
  
  .forecast-card img {
    width: 40px;
    height: 40px;
  }
  
  .sidebar {
    width: 100%;
  }
  
  .sidebar-header {
    padding: var(--spacing-md);
  }
  
  .sidebar-nav {
    padding: var(--spacing-md);
  }
  
  .nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }
  
  .nav-link i {
    width: 16px;
  }
  
  .logo h1 {
    font-size: 1.1rem;
  }
  
  .logo i {
    font-size: 1.25rem;
  }
}

@media (max-width: 360px) {
  .main-temp {
    font-size: 2.5rem;
  }
  
  .location-info h2 {
    font-size: 1.25rem;
  }
  
  .weather-description {
    font-size: 0.9rem;
  }
  
  .detail-card {
    padding: var(--spacing-sm);
  }
  
  .detail-value {
    font-size: 0.9rem;
  }
  
  .hour-card {
    min-width: 80px;
    padding: var(--spacing-sm);
  }
  
  .forecast-card {
    padding: var(--spacing-sm);
  }
}

/* Auth Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-xl);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.auth-tabs {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.tab {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 600;
}

.tab.active {
  background: var(--primary);
  color: var(--text-light);
}

.auth-body {
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.auth-form input {
  padding: var(--spacing-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.auth-form input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--bg-primary);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
}

.auth-hint {
  min-height: 1.25rem;
}

/* Disabled visual state */
.disabled {
  opacity: 0.6;
  pointer-events: none;
}

/* Footer Styles */
.footer {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border-top: 1px solid var(--border-light);
  margin-top: auto;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="footer-grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="currentColor" opacity="0.05"/><circle cx="75" cy="75" r="1" fill="currentColor" opacity="0.05"/><circle cx="50" cy="10" r="0.5" fill="currentColor" opacity="0.05"/></pattern></defs><rect width="100" height="100" fill="url(%23footer-grain)"/></svg>');
  opacity: 0.3;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.footer-section h4 {
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  position: relative;
}

.footer-section h4::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.footer-logo i {
  font-size: 1.5rem;
  color: var(--primary);
}

.footer-logo span {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-tagline {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.footer-section ul {
  list-style: none;
  padding: 0;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  display: inline-block;
  position: relative;
}

.footer-section ul li a:hover {
  color: var(--primary);
  transform: translateX(4px);
}

.footer-section ul li a::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--primary);
  transition: width var(--transition-normal);
}

.footer-section ul li a:hover::before {
  width: 100%;
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.social-links a::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
  transition: left 0.5s;
}

.social-links a:hover::before {
  left: 100%;
}

.social-links a:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  position: relative;
  z-index: 1;
}

.footer-legal {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-legal p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0;
}

.developer-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.developer-link:hover {
  color: var(--primary-dark);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary);
}

/* Footer Responsive */
@media (max-width: 768px) {
  .footer {
    padding: var(--spacing-lg) 0 var(--spacing-md);
  }
  
  .footer-content {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-md);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
  }
  
  .footer-links {
    justify-content: center;
    gap: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-sm);
  }
  
  .footer-section h4 {
    font-size: 1rem;
  }
  
  .footer-logo span {
    font-size: 1.1rem;
  }
  
  .footer-tagline {
    font-size: 0.85rem;
  }
  
  .footer-section ul li a {
    font-size: 0.85rem;
  }
  
  .social-links {
    gap: var(--spacing-sm);
  }
  
  .social-links a {
    width: 36px;
    height: 36px;
  }
  
  .footer-legal p {
    font-size: 0.8rem;
  }
  
  .footer-links {
    gap: var(--spacing-sm);
  }
  
  .footer-links a {
    font-size: 0.8rem;
  }
}

.mobile-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: none;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-light);
  box-shadow: 0 -6px 12px rgba(0,0,0,0.04);
  z-index: 1200;
}

.mobile-nav button {
  flex: 1;
  background: transparent;
  border: none;
  padding: 10px 6px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 12px;
}

.mobile-nav i {
  font-size: 16px;
}

@media (max-width: 768px) {
  .mobile-nav {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
  }
  /* give space for bottom nav */
  .content-wrapper {
    padding-bottom: 64px;
  }
}