/* CSS Variables for theming */
:root {
  --primary-color: #3b82f6;
  --primary-dark: #2563eb;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --error-color: #ef4444;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --border-color: #e2e8f0;
  --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);
  
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  --transition: all 0.2s ease-in-out;
  --transition-slow: all 0.3s ease-in-out;
}

/* Dark theme variables */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  
  --border-color: #334155;
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition-slow);
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] .header {
  background: rgba(15, 23, 42, 0.95);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  transition: var(--transition);
}

.logo:hover {
  transform: scale(1.05);
}

.logo i {
  font-size: 1.75rem;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-5px); }
}

.theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.125rem;
}

.theme-toggle:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  transform: translateY(-1px) rotate(180deg);
  box-shadow: var(--shadow-md);
}

/* Main Content */
.main-content {
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Search Section */
.search-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  animation: slideDown 0.6s ease-out;
}

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

.search-container {
  display: flex;
  gap: 0.75rem;
  width: 100%;
  max-width: 500px;
}

.search-input-group {
  position: relative;
  flex: 1;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
  transition: var(--transition);
}

.search-input:focus + .search-icon {
  color: var(--primary-color);
}

.search-input {
  width: 100%;
  padding: 1rem 1rem 1rem 3rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(59 130 246 / 0.1);
  transform: translateY(-1px);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-button {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.search-button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.search-button:active {
  transform: translateY(0);
}

.location-btn {
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.location-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Weather Section */
.weather-section {
  display: flex;
  justify-content: center;
  animation: fadeIn 0.8s ease-out 0.2s both;
}

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

.weather-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 500px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.weather-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transform: scaleX(0);
  transition: var(--transition-slow);
}

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

.weather-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

.weather-header {
  margin-bottom: 1.5rem;
}

.city-name {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  transition: var(--transition);
}

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

.weather-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.temperature-container {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.temperature {
  font-size: 4rem;
  font-weight: 300;
  color: var(--text-primary);
  line-height: 1;
  transition: var(--transition);
}

.temperature-unit {
  font-size: 1.5rem;
  color: var(--text-secondary);
  font-weight: 400;
  transition: var(--transition);
}

.weather-icon-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

.weather-icon {
  font-size: 4rem;
  color: var(--accent-color);
  transition: var(--transition);
  animation: weatherIconFloat 4s ease-in-out infinite;
}

@keyframes weatherIconFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  25% { transform: translateY(-3px) rotate(2deg); }
  75% { transform: translateY(-3px) rotate(-2deg); }
}

.condition {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  text-transform: capitalize;
  transition: var(--transition);
}

.weather-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.detail-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  cursor: pointer;
}

.detail-item:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.detail-item i {
  font-size: 1.25rem;
  color: var(--primary-color);
  width: 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.detail-item:hover i {
  transform: scale(1.1);
}

.detail-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.detail-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
  transition: var(--transition);
}

.detail-value {
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 600;
  transition: var(--transition);
}

/* Forecast Section */
.forecast-section {
  width: 100%;
  animation: fadeIn 0.8s ease-out 0.4s both;
}

.forecast-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.forecast-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.forecast-cards .card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  animation: slideInUp 0.6s ease-out both;
}

.forecast-cards .card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transform: scaleX(0);
  transition: var(--transition);
}

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

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

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.forecast-cards .card h4 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  font-weight: 500;
  transition: var(--transition);
}

.forecast-cards .card p {
  margin-bottom: 0.5rem;
  transition: var(--transition);
}

.forecast-cards .card p:first-of-type {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.forecast-cards .card p:last-of-type {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: capitalize;
}

/* Loading State */
.loading {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 3rem;
  color: var(--text-secondary);
  animation: fadeIn 0.3s ease-out;
}

.loading-spinner {
  width: 3rem;
  height: 3rem;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Error State */
.error {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 3rem;
  color: var(--error-color);
  text-align: center;
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.error i {
  font-size: 3rem;
  animation: pulse 2s ease-in-out infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 0.75rem;
  }
  
  .main-content {
    padding: 1.5rem 0;
    gap: 1.5rem;
  }
  
  .search-container {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .weather-card {
    padding: 1.5rem;
    margin: 0 0.5rem;
  }
  
  .temperature {
    font-size: 3rem;
  }
  
  .weather-icon {
    font-size: 3rem;
  }
  
  .weather-details {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .forecast-cards {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
  }
}

@media (max-width: 480px) {
  .header-content {
    padding: 0.75rem 0;
  }
  
  .logo {
    font-size: 1.25rem;
  }
  
  .logo i {
    font-size: 1.5rem;
  }
  
  .weather-card {
    padding: 1rem;
  }
  
  .temperature {
    font-size: 2.5rem;
  }
  
  .weather-icon {
    font-size: 2.5rem;
  }
  
  .forecast-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

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

/* Selection styles */
::selection {
  background: var(--primary-color);
  color: white;
}

::-moz-selection {
  background: var(--primary-color);
  color: white;
}