/* ===================================================
   鈴木基行先生 最終講義・退職記念祝賀会 専用CSS
=================================================== */

/* ================= レイアウト ================= */

#archive-container {
  max-width: 1100px;
  margin: 30px auto 30px;
  padding: 0 24px;
}

/* ================= タイトル ================= */

#archive-title {
  text-align: center;
  margin: 30px 0 20px;
}

#archive-title h1 {
  font-size: 2.3rem;
  font-weight: 700;
  color: #003366;
  letter-spacing: 2px;
}

/* ================= セクション ================= */

.archive-section {
  margin-bottom: 30px;
}

.archive-section h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: #003366;
  padding-bottom: 12px;
  margin-bottom: 20px;
  border-bottom: 2px solid #e5ecf3;
}

/* ================= 開催情報ボックス ================= */

.info-box {
  background: #ffffff;
  padding: 26px;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
  line-height: 1.8;
}

.info-box p {
  margin: 6px 0;
}

.download-box {
  margin-top: 20px;
  padding: 18px;
  background: #f3f6fa;
  border-radius: 12px;
}

.download-box a {
  color: #003366;
  font-weight: 600;
  text-decoration: none;
}

.download-box a:hover {
  text-decoration: underline;
}

/* ================= ギャラリーグリッド ================= */

.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

/* ================= 画像カード ================= */

.archive-item {
  display: block;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.archive-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.archive-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.1);
}

/* ================= 戻るボタン ================= */

.back-link {
  text-align: center;
  margin: 60px 0 40px;
}

.back-link a {
  display: inline-block;
  padding: 14px 34px;
  background: #003366;
  color: #ffffff;
  border-radius: 28px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
}

.back-link a:hover {
  background: #0055a0;
  transform: translateY(-2px);
}

/* ================= レスポンシブ ================= */

@media (max-width: 768px) {

  #archive-container {
    margin: 100px auto 80px;
  }

  #archive-title h1 {
    font-size: 1.9rem;
  }

  .archive-section h2 {
    font-size: 1.5rem;
  }

  .archive-item img {
    height: 190px;
  }

}