body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  background-color: #0d0d0d;
  color: white;
  font-family: sans-serif;
  overflow-x: hidden;
}

canvas#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  background: #000;
}

header, main {
  position: relative;
  z-index: 1;
}

.alert-section {
  padding: 1rem;
  border-radius: 0.75rem;
  color: white;
}

#police-section { background: linear-gradient(135deg, #1E3A8A, #3B82F6); }
#fire-section { background: linear-gradient(135deg, #C2410C, #F97316); }
#nhs-section { background: linear-gradient(135deg, #1D4ED8, #3B82F6); }
#weather-section { background: linear-gradient(135deg, #B45309, #FACC15); }

.alert-card {
  background-color: rgba(0,0,0,0.45);
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  border-radius: 0.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}
.alert-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 10px rgba(255,255,255,0.3);
}

.filter-btn {
  padding: 0.5rem 1.2rem;
  border-radius: 9999px;
  font-weight: 600;
  color: white;
  margin: 0.25rem;
  transition: transform 0.2s, box-shadow 0.2s;
}
.filter-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 10px rgba(255,255,255,0.5);
}

.filter-btn[data-target="police"] { background-color: #1E3A8A; }
.filter-btn[data-target="fire"] { background-color: #C2410C; }
.filter-btn[data-target="nhs"] { background-color: #1D4ED8; }
.filter-btn[data-target="weather"] { background-color: #B45309; }
.filter-btn[data-target="all"] { background-color: #4B5563; }

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 10px;
  box-shadow: 0 0 4px currentColor;
}
.read-more-btn {
  margin-top: 0.25rem;
  background: rgba(255,255,255,0.1);
  border: none;
  color: #fff;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s;
}
.read-more-btn:hover { background: rgba(255,255,255,0.2); }

.alert-description {
  max-height: 3.5em; /* collapsed height */
  overflow: hidden;
  transition: max-height 0.3s ease;
  color: #e0e0e0;
  margin-top: 0.25rem;
}
.alert-description.open {
  max-height: 1000px; /* expanded height */
}