body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  color: #111;
  background: #fff;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  text-align: center;
  padding: 20vh 1rem 4rem;
}

.site-header h1 {
  font-size: 2.5rem;
  margin: 0;
}

.subtitle {
  margin-top: 0.5rem;
  font-size: 1rem;
  letter-spacing: 0.1em;
}

.years {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: #666;
}

.year-index {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  gap: 0.5rem;
  padding: 2rem;
  text-align: center;
}

.page-header {
  padding: 4rem 2rem 2rem;
}

.year-list section {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid #eee;
}

.site-footer {
  padding: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: #666;
}
main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 20px;
}
/* ===== Gallery Grid ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.gallery-grid img {
  width: 100%;
  height: 200px;   /* ← 少し小さめで上品 */
  object-fit: cover;
  display: block;
}

.gallery-page {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 20px;
}