body {
  margin: 0;
  font-family: 'Segoe UI';
  transition: 0.4s;
}

.dark {
  background: linear-gradient(135deg, #0f172a, #020617);
  color: white;
}

.light {
  background: #f1f5f9;
  color: black;
}

/* HEADER */
header {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  padding: 20px;
}

/* SEARCH BAR (BIGGER + CENTERED) */
#search {
  width: 350px;
  padding: 12px;
  border-radius: 25px;
  border: none;
  outline: none;
  font-size: 16px;
  text-align: center;
  transition: 0.3s;
}

#search:focus {
  transform: scale(1.05);
  box-shadow: 0 0 15px cyan;
}

/* GRID */
.container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
  padding: 20px;
}

/* CARDS */
.card {
  padding: 20px;
  border-radius: 20px;
  backdrop-filter: blur(15px);
  background: rgba(255,255,255,0.08);
  box-shadow: 0 0 25px rgba(0,0,0,0.3);
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 0 30px cyan;
}

.big {
  grid-column: span 3;
  text-align: center;
}

.full {
  grid-column: span 3;
}

/* AQI CIRCLE */
.circle {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 10px solid cyan;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto;
  font-size: 32px;
  animation: glow 2s infinite alternate;
}

/* GLOW ANIMATION */
@keyframes glow {
  from {
    box-shadow: 0 0 10px cyan;
  }
  to {
    box-shadow: 0 0 30px cyan, 0 0 50px cyan;
  }
}

/* AI BOX */
#ai {
  font-size: 16px;
  line-height: 1.5;
  animation: fadeIn 1s ease-in;
}

/* FADE IN */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* BUTTON */
button {
  padding: 10px 15px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
}