* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #111827;
  color: #f3f4f6;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 18px 24px;
  background: #0b1220;
  border-bottom: 1px solid #273244;
}

header h1 {
  margin: 0 0 4px;
  font-size: 1.55rem;
}

header p {
  margin: 0;
  color: #9ca3af;
}

button {
  border: 1px solid #374151;
  background: #1f2937;
  color: white;
  padding: 8px 12px;
  border-radius: 7px;
  cursor: pointer;
}

button:hover {
  background: #374151;
}

.camera-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 16px;
}

.camera-card {
  background: #0f172a;
  border: 1px solid #263244;
  border-radius: 10px;
  overflow: hidden;
  min-height: 360px;
}

.camera-header {
  height: 48px;
  padding: 9px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #182235;
  font-weight: 700;
}

.camera-card iframe {
  width: 100%;
  height: calc(100% - 48px);
  min-height: 310px;
  border: 0;
  background: black;
}

footer {
  padding: 10px 18px 20px;
  text-align: center;
  color: #9ca3af;
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .camera-grid {
    grid-template-columns: 1fr;
  }
}