body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f4;
}
header {
  background-color: #003366;
  color: white;
  padding: 20px;
  text-align: center;
}
.banner {
  width: 100%;
  max-height: 250px;
  object-fit: cover;
}
nav {
  background-color: #004080;
  padding: 10px;
  text-align: center;
}
nav a {
  color: white;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}
nav a:hover {
  text-decoration: underline;
}
main {
  padding: 20px;
}
.tab {
  display: none;
}
.tab.active {
  display: block;
}
.planning-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  background-color: #e0e0e0;
  padding: 10px;
}
footer {
  background-color: #003366;
  color: white;
  text-align: center;
  padding: 10px;
}
.love-room {
  display: flex;
  align-items: center;
  margin: 20px 0;
  justify-content: center;
}
.heart-icon {
  width: 72px;
  height: 72px;
  margin: 0 20px;
}