/* ═══════════════════════════════════════════════════════════
   NEPAL HAWA — Design System & Styles
   Mirrors the Flutter app's AppColors & theme
════════════════════════════════════════════════════════════ */

/* ── Custom Properties (Light Mode) ── */
:root {
  /* AQI Status Colors */
  --aqi-good:              #45A36B;
  --aqi-moderate:          #C9992E;
  --aqi-usg:               #C56A9A;
  --aqi-unhealthy:         #D14C43;
  --aqi-very-unhealthy:    #7C63B8;
  --aqi-hazardous:         #625D73;

  /* AQI Gradient Pairs */
  --aqi-good-g1:           #A8DDBF;
  --aqi-good-g2:           #67BD8A;
  --aqi-moderate-g1:       #F0D083;
  --aqi-moderate-g2:       #D5A33D;
  --aqi-usg-g1:            #E2A2C5;
  --aqi-usg-g2:            #C56A9A;
  --aqi-unhealthy-g1:      #E68A7D;
  --aqi-unhealthy-g2:      #D14C43;
  --aqi-vu-g1:             #C2B1EA;
  --aqi-vu-g2:             #876FCA;
  --aqi-hazardous-g1:      #AAA1BE;
  --aqi-hazardous-g2:      #625D73;

  /* App Palette */
  --bg:                    #FAF9F6;
  --surface:               #FFFFFF;
  --card-bg:               #F7ECDD;
  --text-primary:          #181A1F;
  --text-secondary:        #4B4741;
  --divider:               #D1BEA7;
  --accent:                #2F6FAE;
  --accent-light:          #C2D9EE;
  --glass:                 rgba(255,255,255,0.82);
  --glass-border:          rgba(241,234,223,0.9);
  --soft-peach:            #E9AB7B;
  --soft-mint:             #9FD4B7;
  --soft-teal:             #8EBBD3;
  --soft-lilac:            #B39AD8;

  /* Layout */
  --nav-height:            64px;
  --bottom-nav-height:     80px;
  --max-content:           1040px;
  --radius-sm:             10px;
  --radius-md:             16px;
  --radius-lg:             22px;
  --radius-xl:             28px;
  --radius-pill:           999px;

  /* Shadows */
  --shadow-sm:             0 2px 8px rgba(0,0,0,0.06);
  --shadow-md:             0 6px 18px rgba(0,0,0,0.09);
  --shadow-lg:             0 12px 32px rgba(0,0,0,0.12);

  /* Transitions */
  --transition-fast:       150ms ease;
  --transition-normal:     250ms ease;
  --transition-slow:       400ms cubic-bezier(0.34,1.56,0.64,1);
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--transition-normal), color var(--transition-normal);
}

button { cursor: pointer; border: none; background: none; font-family: inherit; }
select { font-family: inherit; }
svg { display: block; flex-shrink: 0; }
.hidden { display: none !important; }

/* ═══════════════════════════════════════════════════════════
   TOP NAVIGATION
════════════════════════════════════════════════════════════ */
.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 100;
  transition: background var(--transition-normal);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 12px;
  max-width: 1200px;
  margin: 0 auto;
  gap: 8px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-logo-ring {
  color: var(--accent);
  animation: spin-slow 8s linear infinite;
}

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

.nav-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.4px;
  display: block;
  line-height: 1.1;
}

.nav-subtitle {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-secondary);
  display: block;
  letter-spacing: 0.5px;
}

.nav-center { flex: 1; display: flex; justify-content: center; }

@media (max-width: 430px) {
  .nav-brand { gap: 7px; }
  .nav-logo-ring svg {
    width: 18px;
    height: 18px;
  }
  .nav-title { font-size: 14px; }
  .nav-subtitle { display: none; }
  .city-selector-wrap {
    gap: 4px;
    padding: 6px 10px;
  }
  .city-selector {
    font-size: 12px;
    min-width: 84px;
  }
}

@media (min-width: 768px) {
  .nav-inner {
    padding: 0 20px;
    gap: 16px;
  }
}

.city-selector-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1.5px solid var(--divider);
  border-radius: var(--radius-pill);
  padding: 7px 14px;
  position: relative;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.city-selector-wrap:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47,111,174,0.12);
}

.city-icon { color: var(--accent); flex-shrink: 0; }
.chevron-icon { color: var(--text-secondary); flex-shrink: 0; pointer-events: none; }

.city-selector {
  appearance: none;
  background: transparent;
  border: none;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  min-width: 92px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.icon-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

@media (min-width: 768px) {
  .city-selector { min-width: 110px; }
  .nav-actions { gap: 6px; }
  .icon-btn {
    width: 38px;
    height: 38px;
  }
}

.icon-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
  transform: scale(1.05);
}

.icon-btn:active { transform: scale(0.95); }

#refresh-btn.spinning svg {
  animation: spin 0.8s linear infinite;
}

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

/* ═══════════════════════════════════════════════════════════
   MAIN CONTENT
════════════════════════════════════════════════════════════ */
.main-content {
  margin-top: var(--nav-height);
  padding-bottom: calc(var(--bottom-nav-height) + 24px);
  min-height: calc(100vh - var(--nav-height));
}

/* ── Tab Panels ── */
.tab-panel {
  display: none;
  animation: fadeIn 0.3s ease;
}
.tab-panel.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Section Wrapper ── */
.section-wrap {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 20px;
  margin-bottom: 32px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.section-badge {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--card-bg);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--divider);
}

/* ═══════════════════════════════════════════════════════════
   HERO CARD
════════════════════════════════════════════════════════════ */
.hero-section {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 24px 20px 0;
}

/* Space between hero card and cities section */
#cities-section {
  margin-top: 28px;
}

.hero-card {
  border-radius: var(--radius-xl);
  overflow: hidden;
  min-height: 280px;
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hero-card:hover { transform: translateY(-2px); }

/* Shimmer loading state */
.hero-shimmer {
  background: var(--surface);
  border-radius: var(--radius-xl);
  min-height: 280px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  border: 1px solid var(--divider);
}

.shimmer-block {
  background: linear-gradient(90deg, var(--divider) 25%, var(--card-bg) 50%, var(--divider) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: var(--radius-md);
}

.shimmer-title  { height: 32px; width: 55%; }
.shimmer-subtitle { height: 18px; width: 35%; }
.shimmer-gauge  { height: 100px; width: 100px; border-radius: 50%; align-self: flex-end; margin-top: -60px; }

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

/* Actual hero content */
.hero-content {
  padding: 26px 26px 22px;
  position: relative;
  overflow: hidden;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Ambient blobs */
.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.35;
  pointer-events: none;
}
.hero-blob-1 { width: 160px; height: 160px; top: -40px; right: -30px; }
.hero-blob-2 { width: 120px; height: 120px; bottom: -20px; left: 20px; }

.hero-row1 {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.hero-city {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.8px;
  line-height: 1.1;
  margin-bottom: 4px;
}

.hero-category {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.2px;
  margin-bottom: 2px;
}

.hero-pollutant {
  font-size: 12px;
  font-weight: 500;
  opacity: 0.72;
}

/* Circular gauge */
.aqi-gauge-wrap {
  flex-shrink: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.aqi-gauge-svg { transform: rotate(-90deg); }

.gauge-track {
  fill: none;
  stroke-width: 7;
  stroke-linecap: round;
  transition: stroke 0.4s;
}

.gauge-arc {
  fill: none;
  stroke-width: 7;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s cubic-bezier(0.34, 1.3, 0.64, 1), stroke 0.4s;
}

.gauge-center-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  line-height: 1;
}

.gauge-aqi-num {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -1.5px;
  display: block;
}

.gauge-aqi-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  opacity: 0.65;
}

/* Weather chips */
.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 18px;
}

.weather-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  border: 1px solid;
}

.weather-chip svg { opacity: 0.7; }

/* Advice row */
.hero-advice {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 14px;
}

.hero-advice-text {
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1.45;
  flex: 1;
}

/* Footer */
.hero-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}

.hero-updated {
  font-size: 11px;
  opacity: 0.6;
}

.hero-share-btn {
  display: flex;
  align-items: center;
  gap: 3px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1px;
  padding: 4px 0;
  background: none;
  border: none;
  cursor: pointer;
  opacity: 0.85;
  transition: opacity var(--transition-fast);
}
.hero-share-btn:hover { opacity: 1; }

.hero-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ── Feels Like ── */
.hero-feels-like {
  font-size: 12px;
  font-weight: 500;
  margin-top: 6px;
  opacity: 0.72;
}

/* ═══════════════════════════════════════════════════════════
   CITIES CAROUSEL
════════════════════════════════════════════════════════════ */
.cities-carousel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 500px) {
  .cities-carousel { grid-template-columns: repeat(2, 1fr); }
}

.city-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  padding: 16px;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.city-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-light);
}

.city-card:active { transform: scale(0.97); }

.city-card.active-city {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(47,111,174,0.15);
}

.city-card-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  margin-bottom: 9px;
  flex-shrink: 0;
}

.city-card-aqi {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1;
  margin-bottom: 4px;
}

.city-card-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.city-card-cat {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.city-card-shimmer {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  padding: 16px;
  min-height: 100px;
}

/* ═══════════════════════════════════════════════════════════
   AQI TREND CHART
════════════════════════════════════════════════════════════ */
.chart-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

/* ═══════════════════════════════════════════════════════════
   NEWS & ALERTS
════════════════════════════════════════════════════════════ */
.news-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  padding: 16px;
  margin-bottom: 12px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.news-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.news-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.news-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 6px;
}

.news-source {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
}

.news-dot {
  width: 3px;
  height: 3px;
  background: var(--text-secondary);
  border-radius: 50%;
}

.news-time {
  font-size: 12px;
  color: var(--text-secondary);
}

.news-empty {
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 32px 0;
}

.news-body {
  flex: 1;
  min-width: 0;
}

/* ═══════════════════════════════════════════════════════════
   MAP TAB
════════════════════════════════════════════════════════════ */
.map-header {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 24px 20px 16px;
}

.map-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.map-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.map-container {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
}

#leaflet-map {
  height: 380px;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  overflow: hidden;
  z-index: 1;
}

.map-legend {
  position: absolute;
  bottom: 16px;
  right: 36px;
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  z-index: 1000;
  min-width: 130px;
}

.legend-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 5px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-primary);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.map-city-grid {
  max-width: var(--max-content);
  margin: 20px auto 0;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 500px) {
  .map-city-grid { grid-template-columns: repeat(2, 1fr); }
}

.map-city-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  padding: 14px;
  text-align: center;
  color: inherit;
  font-family: inherit;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.map-city-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.map-city-name {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.map-city-aqi {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 2px;
}

.map-city-cat {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Custom Leaflet Popup */
.leaflet-popup-content-wrapper {
  border-radius: var(--radius-md) !important;
  border: 1.5px solid var(--divider) !important;
  box-shadow: var(--shadow-md) !important;
  font-family: 'Inter', sans-serif !important;
}

.leaflet-popup-content { margin: 10px 14px !important; }

.popup-city { font-size: 14px; font-weight: 700; color: var(--text-primary); }
.popup-aqi  { font-size: 22px; font-weight: 800; margin: 4px 0; }
.popup-cat  { font-size: 12px; font-weight: 600; }

/* ═══════════════════════════════════════════════════════════
   LEARN TAB
════════════════════════════════════════════════════════════ */
.learn-hero {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 28px 20px 20px;
  text-align: center;
}

.learn-hero-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.6px;
  color: var(--text-primary);
}

.learn-hero-sub {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 6px;
}

#learn-content {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 20px;
}

/* AQI Scale Bar */
.aqi-scale-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  padding: 22px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.learn-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.aqi-scale-bar {
  height: 14px;
  border-radius: var(--radius-pill);
  background: linear-gradient(to right,
    #45A36B 0%, #45A36B 16.7%,
    #C9992E 16.7%, #C9992E 33.3%,
    #C56A9A 33.3%, #C56A9A 50%,
    #D14C43 50%, #D14C43 66.7%,
    #7C63B8 66.7%, #7C63B8 83.3%,
    #625D73 83.3%, #625D73 100%
  );
  margin-bottom: 10px;
}

.aqi-scale-labels {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: 16px;
}

.aqi-level-list { display: flex; flex-direction: column; gap: 10px; }

.aqi-level-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--divider);
}

.aqi-level-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.aqi-level-range {
  font-size: 13px;
  font-weight: 700;
  min-width: 60px;
  color: var(--text-primary);
}

.aqi-level-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.aqi-level-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Pollutant Cards */
.pollutant-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

@media (max-width: 420px) {
  .pollutant-grid { grid-template-columns: 1fr; }
}

.pollutant-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

.pollutant-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 10px;
}

.pollutant-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.pollutant-formula {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.pollutant-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Health Tips */
.health-tips-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--divider);
  padding: 22px;
  margin-bottom: 24px;
}

.health-tip-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--divider);
}

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

.health-tip-emoji {
  font-size: 24px;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.health-tip-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 3px;
}

.health-tip-body {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}



/* ═══════════════════════════════════════════════════════════
   BOTTOM NAV — Floating glassmorphism pill
════════════════════════════════════════════════════════════ */

#bottom-nav {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 10px;
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1.5px solid var(--glass-border);
  border-radius: 32px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.14), 0 2px 6px rgba(0,0,0,0.06);
  z-index: 100;
}

/* Bottom fade gradient so content doesn’t hard-stop at the nav */
#bottom-nav::before {
  content: '';
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 110px;
  background: linear-gradient(to top, var(--bg) 20%, transparent);
  pointer-events: none;
  z-index: -1;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 20px 7px;
  border-radius: 20px;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: color var(--transition-normal), background var(--transition-normal);
}

.nav-item:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.nav-item:active { transform: scale(0.93); }

.nav-item.active {
  background: rgba(47,111,174,0.12);
  color: var(--accent);
}

.nav-item.active .nav-icon {
  transform: scale(1.1);
}

.nav-icon {
  transition: transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1px;
}

/* ═══════════════════════════════════════════════════════════
   TOAST NOTIFICATION
════════════════════════════════════════════════════════════ */
.toast {
  position: fixed;
  bottom: calc(var(--bottom-nav-height) + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text-primary);
  color: var(--bg);
  font-size: 13px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: none;
  white-space: nowrap;
  z-index: 200;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ═══════════════════════════════════════════════════════════
   SEARCH
════════════════════════════════════════════════════════════ */
.search-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
}

.search-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(24,26,31,0.28);
  backdrop-filter: blur(3px);
}

.search-sheet {
  position: relative;
  width: min(620px, calc(100% - 32px));
  margin: 82px auto 0;
  background: var(--surface);
  border: 1.5px solid var(--divider);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.search-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px;
  border-bottom: 1px solid var(--divider);
}

.search-close {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg);
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text-primary);
  font: inherit;
  font-size: 16px;
  font-weight: 600;
  min-width: 0;
}

.search-input::placeholder { color: var(--text-secondary); font-weight: 500; }

.search-results {
  max-height: min(560px, calc(100vh - 170px));
  overflow-y: auto;
  padding: 10px;
}

.search-result-card {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-md);
  color: inherit;
  text-align: left;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.search-result-card:not(.loading):hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}

.search-result-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--accent-light);
  color: var(--accent);
  flex-shrink: 0;
}

.search-result-body {
  display: flex;
  flex: 1;
  min-width: 0;
  flex-direction: column;
  gap: 3px;
}

.search-result-name {
  font-size: 14px;
  font-weight: 800;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-meta {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-action {
  font-size: 12px;
  font-weight: 800;
  color: var(--accent);
}

.search-empty {
  padding: 34px 20px;
  text-align: center;
}

.search-empty-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.search-empty-text {
  max-width: 420px;
  margin: 0 auto;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-secondary);
}

/* ═══════════════════════════════════════════════════════════
   LOCATION DETAIL
════════════════════════════════════════════════════════════ */
.detail-page {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 22px 20px 36px;
}

.detail-header-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.detail-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.detail-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.detail-back-btn,
.detail-share-btn {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--divider);
  color: var(--text-primary);
  background: var(--surface);
  flex-shrink: 0;
}

.detail-share-btn { margin-left: auto; }

.detail-hero {
  border-radius: var(--radius-xl);
  padding: 24px;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}

.detail-city {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.8px;
  line-height: 1.05;
  padding-right: 112px;
}

.detail-category {
  font-size: 15px;
  font-weight: 800;
  margin-top: 5px;
}

.detail-pollutant {
  font-size: 12px;
  font-weight: 600;
  margin-top: 3px;
}

.detail-gauge {
  position: absolute;
  top: 22px;
  right: 22px;
  width: 104px;
  height: 104px;
}

.detail-gauge-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.detail-gauge-text strong {
  font-size: 30px;
  line-height: 1;
  letter-spacing: -1px;
}

.detail-gauge-text span {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.5px;
}

.detail-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.detail-feels {
  font-size: 12px;
  font-weight: 600;
  margin-top: 8px;
}

.detail-advice {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  max-width: 680px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.45;
  margin-top: 16px;
}

.detail-updated {
  font-size: 11px;
  font-weight: 600;
  margin-top: 18px;
}

.detail-section {
  margin-bottom: 28px;
}

.detail-card,
.detail-loading-card {
  background: var(--surface);
  border: 1.5px solid var(--divider);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

.forecast-tabs,
.history-tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 10px;
}

.forecast-tab,
.history-tab {
  flex: 0 0 auto;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 800;
}

.forecast-tab.active,
.history-tab.active {
  background: var(--accent-light);
  color: var(--accent);
}

.forecast-hourly {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 72px;
  gap: 10px;
  overflow-x: auto;
  padding: 6px 0 2px;
}

.forecast-hour-card {
  border: 1px solid var(--divider);
  border-radius: 14px;
  padding: 10px 8px;
  text-align: center;
}

.forecast-hour-time {
  font-size: 10px;
  font-weight: 800;
  color: var(--text-secondary);
}

.forecast-hour-icon {
  font-size: 20px;
  margin: 8px 0;
}

.forecast-hour-value {
  font-size: 12px;
  font-weight: 800;
  color: var(--accent);
}

.forecast-days {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 106px;
  gap: 10px;
  overflow-x: auto;
  margin-top: 12px;
}

.forecast-day-card {
  background: var(--surface);
  border: 1.5px solid var(--divider);
  border-radius: var(--radius-md);
  padding: 12px 10px;
  text-align: center;
}

.forecast-day-name {
  font-size: 12px;
  font-weight: 800;
}

.forecast-day-icon {
  font-size: 22px;
  margin: 7px 0;
}

.forecast-day-temp {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 700;
  margin-bottom: 8px;
}

.forecast-day-aqi {
  font-size: 11px;
  font-weight: 800;
  border: 1px solid;
  border-radius: 10px;
  padding: 5px 6px;
}

.detail-pollutant-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.detail-pollutant-card {
  background: var(--surface);
  border: 1.5px solid var(--divider);
  border-radius: var(--radius-lg);
  padding: 16px;
  min-height: 112px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.detail-pollutant-name {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
}

.detail-pollutant-desc {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 3px;
}

.detail-pollutant-value {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 800;
  color: var(--text-primary);
}

.detail-pollutant-value span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}

.detail-pollutant-value small {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 600;
}

.guideline-note {
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.5;
  padding: 12px 14px;
  border: 1px solid var(--divider);
  border-radius: var(--radius-md);
}

.history-card {
  height: 310px;
}

.history-card canvas {
  height: 220px !important;
}

.pollen-card {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 22px;
  align-items: center;
}

.pollen-index {
  border: 2px solid;
  border-radius: var(--radius-lg);
  padding: 16px 10px;
  text-align: center;
}

.pollen-index-label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 800;
}

.pollen-index-value {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.05;
  margin: 6px 0;
}

.pollen-index-level {
  font-size: 13px;
  font-weight: 800;
  color: var(--text-primary);
}

.pollen-bars {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pollen-bar-label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  color: var(--text-primary);
  margin-bottom: 7px;
}

.pollen-bar-label strong {
  color: var(--text-secondary);
}

.pollen-bar-track {
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--card-bg);
  overflow: hidden;
}

.pollen-bar-track div {
  height: 100%;
  border-radius: var(--radius-pill);
}

/* ═══════════════════════════════════════════════════════════
   DESKTOP LAYOUT ENHANCEMENTS
════════════════════════════════════════════════════════════ */
@media (min-width: 768px) {
  .hero-city { font-size: 36px; }
  .gauge-aqi-num { font-size: 32px; }
  #leaflet-map { height: 460px; }
}

@media (max-width: 520px) {
  .search-sheet {
    width: 100%;
    height: calc(100vh - 54px);
    margin: 54px 0 0;
    border-left: none;
    border-right: none;
    border-bottom: none;
    border-radius: 24px 24px 0 0;
  }

  .detail-page {
    padding: 18px 20px 24px;
  }

  .detail-title {
    font-size: 20px;
  }

  .detail-city {
    font-size: 26px;
    padding-right: 0;
  }

  .detail-gauge {
    position: relative;
    top: auto;
    right: auto;
    margin-top: 16px;
  }

  .detail-pollutant-grid {
    grid-template-columns: 1fr;
  }

  .pollen-card {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1024px) {
  .main-content { padding-bottom: 40px; }

  .hero-section { padding-top: 32px; }

  .cities-carousel { grid-template-columns: repeat(6, 1fr); }

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

/* ═══════════════════════════════════════════════════════════
   UTILITY
════════════════════════════════════════════════════════════ */
.error-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
}

.error-state-icon { font-size: 40px; margin-bottom: 12px; }
.error-state-title { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.error-state-msg { font-size: 13px; line-height: 1.5; margin-bottom: 16px; }

.retry-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: white;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.retry-btn:hover { opacity: 0.88; transform: scale(1.03); }
.retry-btn:active { transform: scale(0.97); }

/* ═══════════════════════════════════════════════════════════
   DESKTOP NAV TABS
════════════════════════════════════════════════════════════ */

/* The tab group sits in the nav-inner flow between brand and actions */
.nav-tabs {
  display: none; /* mobile: hidden — pill nav used instead */
  align-items: center;
  gap: 2px;
  flex: 1;
  justify-content: center;
}

@media (min-width: 768px) {
  .nav-tabs { display: flex; }
}

.nav-tab {
  position: relative;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
  letter-spacing: -0.1px;
}

.nav-tab::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 18px;
  right: 18px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 250ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-tab:hover {
  color: var(--text-primary);
  background: var(--accent-light);
}

.nav-tab.active {
  color: var(--accent);
}

.nav-tab.active::after {
  transform: scaleX(1);
}

/* City selector when it's in the nav-actions area (right side) */
.nav-city-selector { display: flex; }

/* Hide mobile pill on desktop */
@media (min-width: 768px) {
  #bottom-nav { display: none !important; }
}

/* ═══════════════════════════════════════════════════════════
   DASHBOARD 2-COLUMN LAYOUT (desktop ≥ 860px)
════════════════════════════════════════════════════════════ */

@media (min-width: 860px) {
  /* Wrap hero + cities in a side-by-side grid */
  #tab-dashboard .dashboard-top {
    max-width: var(--max-content);
    margin: 0 auto;
    padding: 28px 20px 0;
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 20px;
    align-items: start;
  }

  /* Hero section no longer needs its own horizontal padding */
  #tab-dashboard .hero-section {
    padding: 0;
  }

  /* Cities section sits to the right */
  #cities-section {
    margin-top: 0;
    padding: 0;
  }

  #tab-dashboard .cities-carousel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  /* Restore full-width for chart and news below */
  #trend-section,
  #news-section {
    max-width: var(--max-content);
    margin-left: auto;
    margin-right: auto;
  }
}

/* ═══════════════════════════════════════════════════════════
   BREADCRUMB
════════════════════════════════════════════════════════════ */

.detail-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.breadcrumb-home {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px 4px 4px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

.breadcrumb-home:hover {
  background: var(--accent-light);
}

.breadcrumb-sep {
  font-size: 16px;
  color: var(--text-secondary);
  flex-shrink: 0;
  line-height: 1;
}

.breadcrumb-current {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ═══════════════════════════════════════════════════════════
   SITE FOOTER
════════════════════════════════════════════════════════════ */

.site-footer {
  border-top: 1px solid var(--divider);
  background: var(--surface);
  margin-top: 40px;
  /* Extra bottom padding on mobile so content clears the floating pill */
  padding-bottom: 100px;
}

@media (min-width: 768px) {
  .site-footer { padding-bottom: 0; }
}

.footer-inner {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 32px 24px 24px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 24px 48px;
  align-items: start;
}

@media (max-width: 640px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.footer-brand {}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 6px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 260px;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link {
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 2px 0;
  transition: color var(--transition-fast);
  font-family: inherit;
}

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

.footer-attrib {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  color: var(--text-secondary);
}

.footer-attrib a {
  color: var(--accent);
  text-decoration: none;
}

.footer-attrib a:hover { text-decoration: underline; }

.footer-bottom {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 14px 24px;
  border-top: 1px solid var(--divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12px;
  color: var(--text-secondary);
}

.footer-shortcuts {
  display: none;
}

@media (min-width: 640px) {
  .footer-shortcuts { display: block; }
}

kbd {
  display: inline-block;
  padding: 2px 6px;
  font-size: 11px;
  font-family: inherit;
  font-weight: 700;
  background: var(--card-bg);
  border: 1px solid var(--divider);
  border-radius: 5px;
  color: var(--text-secondary);
  vertical-align: baseline;
}

/* ═══════════════════════════════════════════════════════════
   HOVER & FOCUS POLISH
════════════════════════════════════════════════════════════ */

/* Consistent focus ring for all interactive elements */
:focus-visible {
  outline: 2.5px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* City cards: left-border accent on hover */
.city-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleY(0);
  transition: transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.city-card:hover::before { transform: scaleY(1); }

/* Map city cards get a pointer + lift */
.map-city-card {
  cursor: pointer;
}

.map-city-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent) !important;
}

/* Forecast day cards — subtle accent tint on hover */
.forecast-day-card {
  transition: background var(--transition-fast), transform var(--transition-fast);
  cursor: default;
}

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

/* Hero card "Details →" hint on desktop hover */
@media (min-width: 768px) {
  .hero-card {
    cursor: default;
  }
}