body {
  font-family: 'Noto Sans JP', sans-serif;
  margin: 0;
  background-color: #ffffff;
  color: #1a1a1a;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid #e0e0e0;
  background-color: #0B2545;
}

.logo {
  font-weight: bold;
  font-size: 1.5rem;
  color: #fff;
}

.logo a {
  color: #fff;
  text-decoration: none;
}

nav a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: #fff;
  font-weight: 500;
}

.icon {
  display: flex;
  justify-content: center;
  align-items: center;
  height: auto;
  background-color: #f9f9f9;
}

.icon img {
  vertical-align: top;
  margin-top: 5rem;
  max-width: 100%;
  height: auto;
}

.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(to bottom, #f9f9f9, #ffffff);
}

.hero h1 {
  font-size: 2.5rem;
  color: #0B2545;
}

.hero p {
  font-size: 1.2rem;
  color: #555;
}

/* カードセクション */
.cards {
  padding: 3rem 2rem;
  background-color: #f9f9f9;
}

.cards h2 {
  text-align: center;
  color: #0B2545;
  margin-bottom: 2rem;
}

.card-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.card {
  display: block;
  position: relative;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  width: 250px;
  overflow: hidden;
  transition: transform 0.2s;
  text-decoration: none;
}

.card:hover {
  transform: translateY(-5px);
}

.card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.card-content {
  padding: 1rem;
}

.card-content h3 {
  font-size: 1.1rem;
  color: #0B2545;
  margin-bottom: 0.5rem;
}

.tag {
  display: inline-block;
  background-color: #0B2545;
  color: #fff;
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #0B2545;
  color: #fff;
  font-size: 0.9rem;
}

footer a {
  color: #fff;
  text-decoration: none;
}

/* ============================
   スマホ版レイアウト
============================ */
@media (max-width: 768px) {

  header {
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem;
  }

  nav {
    margin-top: 0.5rem;
  }

  nav a {
    margin-left: 0.8rem;
    font-size: 0.9rem;
  }

  .logo {
    font-size: 1.3rem;
  }

  .icon {
    padding: 1rem;
  }

  .icon img {
    max-width: 90%;
    margin-top: 2rem;
  }

  .hero {
    padding: 2.5rem 1rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .cards {
    padding: 2rem 1rem;
  }

  .card-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .card {
    width: 100%;
    max-width: 100%;
    padding-bottom: 0.5rem;
  }

  .card-content h3 {
    font-size: 1rem;
  }

  .tag {
    font-size: 0.75rem;
    padding: 0.15rem 0.5rem;
  }

  footer {
    font-size: 0.8rem;
    padding: 0.8rem;
  }
}

/* 超小型スマホ */
@media (max-width: 410px) {

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero p {
    font-size: 0.9rem;
  }

  .card-content h3 {
    font-size: 0.95rem;
  }
}