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

body {
  font-family: "Inter", sans-serif;
  background-color: #f8fafc;
  color: #0f172a;
  line-height: 1.5;
  scroll-behavior: smooth;
}

/* Navbar Styles */
.navbar {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid #e2e8f0;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, #0f4c5c, #2b7a4b);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.logo i {
  background: none;
  -webkit-background-clip: unset;
  background-clip: unset;
  color: #2b7a4b;
  font-size: 1.8rem;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links li a {
  text-decoration: none;
  font-weight: 500;
  color: #1e293b;
  transition: all 0.3s ease;
  font-size: 1rem;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
}

.nav-links li a:hover,
.nav-links li a.active {
  color: #2b7a4b;
  border-bottom-color: #2b7a4b;
}

.hamburger {
  display: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: #0f172a;
}

/* Section styling */
.section {
  padding: 4rem 2rem;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
}

.bg-light {
  background-color: #f1f5f9;
}

/* Hero */
.hero-content {
  text-align: center;
  margin-bottom: 3rem;
}

.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.gradient-text {
  background: linear-gradient(120deg, #0f4c5c, #2b7a4b, #65a30d);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-content p {
  color: #475569;
  font-size: 1.1rem;
}

/* AQI Main Card */
.aqi-main-card {
  background: white;
  border-radius: 2rem;
  box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 2rem 2.5rem;
  margin-bottom: 2rem;
  transition: all 0.3s;
  border: 1px solid #e2e8f0;
}

.aqi-gauge {
  flex: 1.2;
  text-align: center;
  border-right: 2px dashed #e2e8f0;
  padding-right: 2rem;
}

.aqi-value {
  font-size: 5rem;
  font-weight: 800;
  line-height: 1;
  color: #1e293b;
}

.aqi-label {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
  color: #475569;
  margin: 0.5rem 0;
}

.aqi-status {
  font-size: 1.25rem;
  font-weight: 600;
  padding: 0.3rem 1rem;
  display: inline-block;
  border-radius: 40px;
  background: #f1f5f9;
  margin-top: 0.5rem;
}

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

.detail-item {
  background: #f8fafc;
  padding: 1rem;
  border-radius: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: all 0.2s;
}

.detail-item i {
  font-size: 1.4rem;
  color: #2b7a4b;
}

.detail-item span:first-of-type {
  font-size: 0.8rem;
  font-weight: 500;
  color: #475569;
  text-transform: uppercase;
}

.detail-item strong {
  font-size: 1.8rem;
  font-weight: 700;
  color: #0f172a;
}

.unit {
  font-size: 0.8rem;
  font-weight: 400;
  color: #64748b;
}

/* metrics row */
.metrics-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  flex: 1;
  background: white;
  border-radius: 1.5rem;
  padding: 1.2rem;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.02);
  border: 1px solid #e2e8f0;
}

.metric-card i {
  font-size: 1.8rem;
  color: #2b7a4b;
}

.metric-card h3 {
  font-size: 0.9rem;
  font-weight: 500;
  margin: 0.5rem 0;
  color: #334155;
}

.metric-value {
  font-size: 1.6rem;
  font-weight: 700;
}

/* Alert Banner */
.alert-banner {
  background: #ffedd5;
  border-left: 6px solid #f97316;
  padding: 1rem 1.5rem;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.2rem;
  font-weight: 500;
  color: #7c2d12;
}

.alert-banner i {
  font-size: 1.6rem;
  color: #f97316;
}

/* Stations Grid */
.section-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-header h2 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}

.section-header p {
  color: #475569;
}

.stations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
}

.station-card {
  background: white;
  border-radius: 1.5rem;
  padding: 1.5rem;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.03);
  border: 1px solid #e2e8f0;
}

.station-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -12px rgba(0, 0, 0, 0.1);
}

.station-name {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.station-aqi {
  font-size: 2.2rem;
  font-weight: 800;
  margin: 0.8rem 0;
}

.station-details {
  display: flex;
  justify-content: space-between;
  margin-top: 0.8rem;
  font-size: 0.85rem;
  color: #334155;
}

/* Health Cards */
.health-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.health-card {
  background: white;
  border-radius: 1.5rem;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.2s;
  border-top: 5px solid;
  box-shadow: 0 5px 12px rgba(0, 0, 0, 0.05);
}

.health-card .level {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 0.7rem;
}

.health-card p {
  font-size: 0.85rem;
  color: #334155;
}

.health-card i {
  font-size: 2rem;
  margin-top: 0.8rem;
  opacity: 0.7;
}

.good {
  border-top-color: #22c55e;
}
.moderate {
  border-top-color: #facc15;
}
.unhealthy-sensitive {
  border-top-color: #f97316;
}
.unhealthy {
  border-top-color: #ef4444;
}
.very-unhealthy {
  border-top-color: #8b5cf6;
}

/* Resources Grid */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
}

.resource-card {
  background: white;
  padding: 1.8rem;
  border-radius: 1.5rem;
  text-align: center;
  transition: 0.2s;
  border: 1px solid #e2e8f0;
}

.resource-card i {
  font-size: 2.5rem;
  color: #2b7a4b;
  margin-bottom: 1rem;
}

.resource-card h3 {
  margin-bottom: 0.6rem;
}

.resource-card p {
  color: #475569;
  font-size: 0.9rem;
}

/* Footer */
.footer {
  background: #0f172a;
  color: #cbd5e1;
  padding-top: 3rem;
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  padding: 0 2rem 2rem;
}

.footer-brand i {
  font-size: 2rem;
  color: #4ade80;
  margin-bottom: 0.5rem;
  display: inline-block;
}

.footer-brand {
  font-size: 1.4rem;
  font-weight: 700;
}

.footer-brand p {
  font-size: 0.85rem;
  margin-top: 0.5rem;
  font-weight: 400;
}

.footer-links h4 {
  color: white;
  margin-bottom: 1rem;
}

.footer-links ul {
  list-style: none;
}

.footer-links ul li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  text-decoration: none;
  color: #cbd5e1;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #4ade80;
}

.footer-newsletter input {
  background: #1e293b;
  border: none;
  padding: 0.7rem 1rem;
  border-radius: 2rem;
  width: 70%;
  color: white;
  outline: none;
}

.footer-newsletter button {
  background: #2b7a4b;
  border: none;
  padding: 0.7rem 1rem;
  border-radius: 2rem;
  color: white;
  cursor: pointer;
  transition: 0.2s;
}

.footer-newsletter button:hover {
  background: #15803d;
}

.footer-bottom {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid #1e293b;
  font-size: 0.8rem;
}

#subMsg {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.7rem;
  color: #86efac;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: -100%;
    background: white;
    width: 100%;
    flex-direction: column;
    align-items: center;
    padding: 2rem 0;
    gap: 1.5rem;
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.1);
    transition: 0.3s;
    z-index: 999;
  }

  .nav-links.active {
    left: 0;
  }

  .hamburger {
    display: block;
  }

  .aqi-main-card {
    flex-direction: column;
    padding: 1.5rem;
  }

  .aqi-gauge {
    border-right: none;
    border-bottom: 2px dashed #e2e8f0;
    padding-bottom: 1rem;
  }

  .aqi-details {
    grid-template-columns: 1fr;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .section {
    padding: 2rem 1rem;
  }

  .metrics-row {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .station-aqi {
    font-size: 1.8rem;
  }
  .detail-item strong {
    font-size: 1.4rem;
  }
  .footer-container {
    grid-template-columns: 1fr;
  }
}

/* AQI dynamic colors (JS updates background of status) */
.status-good {
  background: #dcfce7;
  color: #15803d;
}
.status-moderate {
  background: #fef9c3;
  color: #854d0e;
}
.status-unhealthy-sensitive {
  background: #ffedd5;
  color: #9a3412;
}
.status-unhealthy {
  background: #fee2e2;
  color: #b91c1c;
}
.status-very-unhealthy {
  background: #ede9fe;
  color: #5b21b6;
}