body {
    font-family: sans-serif;
    line-height: 1.6;
    padding: 1em;
    max-width: 800px;
    margin: auto;
  }
  
  header, footer {
    text-align: center;
    margin-bottom: 2em;
  }
  
  header img{
    width: 50%;
    max-width: 500px;
    height: auto;
  }

  header, footer nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }

  header, footer nav a {
    margin: 0 5px;
    padding: 0.5rem 0.75rem;
    white-space: nowrap;
    display: inline-block;
  }

  nav a {
    margin: 0 10px;
    padding: 1rem;
    text-decoration: none;
    color: #0077cc;
  }
  
  h1 {
    color: #333;;
    font-size: 2em;
  }
  
  .copyright {
    text-align: right;
    padding: 2rem;
    font-size: 15px;
    color: #707070;
    background: #ffffff;
    border-top: 1px solid #e5e7eb;
  }
  
  .post-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: space-between;
  }
  
  .post-item {
    width: calc(33.333% - 20px);
    box-sizing: border-box;
    text-align: center;
  }
  
  .post-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 0 6px rgba(0,0,0,0.1);
  }

  a:hover h3 {
    text-decoration: underline;
  }


  article h1,
  section h1,
  nav h1,
  aside h1 {
    font-size: inherit;
  }

/* ===== アートワーク ===== */
.art-menu {
  display: flex;
  gap: 30px;
  margin-top: 2rem;
}

.art-link {
  flex: 1;
  padding: 1rem;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
}

.art-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 2rem;
}

.art-item img {
  width: 100%;
  border-radius: 8px;
  object-fit: cover;
}

/* ===== 告知 ===== */
.notice {
  margin-bottom: 2rem;
}
.notice img {
  width: 50%;
  border-radius: 10px;
}