/* Base Variables & Design System */
:root {
  /* AQI Level Colors */
  --aqi-good: #00e676;
  --aqi-moderate: #ffea00;
  --aqi-unhealthy-sens: #ff9100;
  --aqi-unhealthy: #ff5252;
  --aqi-very-unhealthy: #d500f9;
  --aqi-hazardous: #b71c1c;

  /* Theme Colors (Dark Mode Default) */
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.1);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --glass-blur: 16px;

  --header-height: 70px;
  --transition-speed: 0.3s;
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-gradient: linear-gradient(135deg, #f0f4f8 0%, #d9e2ec 100%);
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-border: rgba(0, 0, 0, 0.05);
  --text-main: #102a43;
  --text-muted: #486581;
  --accent: #2680eb;
}

/* Global Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition-speed) ease;
}

#app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Search */
header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  margin-bottom: 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.icon-brand {
  color: var(--accent);
  width: 28px;
  height: 28px;
}

.search-container {
  display: flex;
  gap: 10px;
  flex: 1;
  max-width: 500px;
  margin: 0 20px;
}

.search-box {
  position: relative;
  flex: 1;
}

.icon-search {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  color: var(--text-muted);
}

#cityInput {
  width: 100%;
  padding: 12px 12px 12px 40px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text-main);
  outline: none;
  font-family: inherit;
  transition: all var(--transition-speed);
}

#cityInput:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

/* Autocomplete / Recent Searches */
.autocomplete-list {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  max-height: 320px;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 1000;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05);
  opacity: 0;
  transform: translateY(-8px) scale(0.98);
  pointer-events: none;
  transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: top center;
}

[data-theme="light"] .autocomplete-list {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.06);
}

.autocomplete-list.active {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

/* Scrollbar in dropdown */
.autocomplete-list::-webkit-scrollbar {
  width: 4px;
}

.autocomplete-list::-webkit-scrollbar-track {
  background: transparent;
}

.autocomplete-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
}

/* Section headers */
.autocomplete-section-header {
  padding: 10px 16px 6px;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

/* Individual items */
.autocomplete-item {
  padding: 11px 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: background 0.15s, padding-left 0.15s;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  position: relative;
  outline: none;
}

.autocomplete-item:last-child {
  border-bottom: none;
}

.autocomplete-item:hover,
.autocomplete-item.selected {
  background: rgba(255, 255, 255, 0.08);
  padding-left: 18px;
}

[data-theme="light"] .autocomplete-item:hover,
[data-theme="light"] .autocomplete-item.selected {
  background: rgba(0, 0, 0, 0.06);
}

.autocomplete-item.selected::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--accent);
}

/* Icon column */
.autocomplete-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--accent);
  font-size: 14px;
}

.autocomplete-icon i {
  width: 14px;
  height: 14px;
}

/* Text column */
.autocomplete-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}

.autocomplete-city {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.autocomplete-city mark {
  background: transparent;
  color: var(--accent);
  font-weight: 700;
}

.autocomplete-country {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Empty state */
.autocomplete-empty {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.autocomplete-empty i {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.7;
}

.btn-primary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 20px;
  border-radius: 12px;
  border: none;
  background: var(--accent);
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, background 0.2s;
}

.btn-primary:hover {
  background: #0ea5e9;
  transform: translateY(-2px);
}

.btn-icon,
.btn-icon-alt {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon:hover,
.btn-icon-alt:hover {
  background: var(--card-border);
  transform: scale(1.05);
}

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto;
  gap: 20px;
  margin-bottom: 40px;
}

/* Card Styles */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  animation: fadeIn 0.8s ease forwards;
  opacity: 0;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.15);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }

  50% {
    transform: scale(1.05);
    opacity: 0.8;
  }

  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Specific Card Layouts */
.hero-card {
  grid-column: span 12;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 250px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.1), rgba(56, 189, 248, 0.05));
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

#cityName {
  font-size: 2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-fav {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  transition: all 0.2s;
}

.btn-fav:hover {
  transform: scale(1.2);
}

.btn-fav.active {
  color: #fbbf24;
  /* Golden star */
}

.btn-share-trigger {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  border-radius: 10px;
  transition: all 0.2s;
}

.btn-share-trigger:hover {
  transform: translateY(-2px);
  background: var(--card-border);
  color: var(--accent);
}

.share-modal-content {
  max-width: 600px;
  text-align: center;
}

.card-preview-container {
  margin: 20px 0;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.3);
  background: var(--card-bg);
  aspect-ratio: 1/1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.share-preview-img img {
  width: 100%;
  height: 100%;
  display: block;
}

.preview-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  color: var(--text-muted);
}

.share-actions {
  display: flex;
  gap: 15px;
  justify-content: center;
}

.preview-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: #f87171;
}

.preview-error i {
  width: 48px;
  height: 48px;
}

.share-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-secondary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 20px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: transparent;
  color: var(--text-main);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: var(--card-bg);
  transform: translateY(-2px);
}

.last-updated {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.aqi-display {
  display: flex;
  align-items: center;
  gap: 40px;
}

.aqi-value-wrapper {
  text-align: center;
}

#aqiValue {
  font-size: 5rem;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--text-main), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.aqi-value-wrapper p {
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--text-muted);
}

.aqi-status h3 {
  font-size: 1.8rem;
  margin-bottom: 8px;
}

#healthAdvice {
  color: var(--text-muted);
  max-width: 400px;
}

.hero-footer {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--card-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.station-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.station-info i {
  width: 16px;
  height: 16px;
}

/* Pollutant Grid */
.pollutant-card {
  grid-column: span 5;
}

.pollutant-card h3,
.chart-card h3,
.map-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  font-size: 1.1rem;
  font-weight: 600;
}

.pollutant-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.pollutant-item {
  background: rgba(255, 255, 255, 0.03);
  padding: 15px;
  border-radius: 16px;
  border: 1px solid var(--card-border);
}

.pollutant-item .label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.pollutant-item .value {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.pollutant-info-btn {
  float: right;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
}

.pollutant-info-btn:hover {
  color: var(--accent);
}

/* Modal Styles */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

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

.modal-content {
  background: var(--bg-gradient);
  border: 1px solid var(--card-border);
  padding: 30px;
  border-radius: 24px;
  max-width: 500px;
  width: 90%;
  position: relative;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

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

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  cursor: pointer;
  color: var(--text-muted);
}

.modal h2 {
  margin-bottom: 15px;
  color: var(--accent);
}

.modal p {
  line-height: 1.6;
  margin-bottom: 20px;
}

.progress-bar {
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar .fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Chart & Map Cards */
.chart-card {
  grid-column: span 7;
}

.map-card {
  grid-column: span 12;
}

.chart-container {
  position: relative;
  height: 300px;
  width: 100%;
}

.map-container {
  height: 400px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--card-border);
}

/* Footer */
footer {
  text-align: center;
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Loader */
.loader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(5px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 999;
}

.hidden {
  display: none;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-left-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* AQI Theme Classes (Dynamic) */
.theme-good {
  --accent: var(--aqi-good);
}

.theme-moderate {
  --accent: var(--aqi-moderate);
}

.theme-unhealthy-sens {
  --accent: var(--aqi-unhealthy-sens);
}

.theme-unhealthy {
  --accent: var(--aqi-unhealthy);
}

.theme-very-unhealthy {
  --accent: var(--aqi-very-unhealthy);
}

.theme-hazardous {
  --accent: var(--aqi-hazardous);
}

/* Responsive adjustments */
@media (max-width: 1024px) {

  .pollutant-card,
  .chart-card {
    grid-column: span 12;
  }
}

@media (max-width: 768px) {
  header {
    flex-wrap: wrap;
    height: auto;
    padding: 20px 0;
  }

  .logo {
    margin-bottom: 15px;
  }

  .search-container {
    order: 3;
    width: 100%;
    max-width: 100%;
    margin: 10px 0 0 0;
  }

  .aqi-display {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  #aqiValue {
    font-size: 4rem;
  }

  .hero-card {
    min-height: auto;
  }
}

@media (max-width: 480px) {
  .pollutant-grid {
    grid-template-columns: 1fr;
  }
}