* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: "Helvetica Neue", Arial, "Hiragino Sans", sans-serif;
    background:
      radial-gradient(circle at top left, rgba(255, 214, 230, 0.5), transparent 30%),
      radial-gradient(circle at bottom right, rgba(196, 224, 255, 0.5), transparent 30%),
      #fffdfd;
    color: #111;
    overflow-x: hidden;
    line-height: 1.8;
  }
  
  section {
    padding: 120px 7%;
  }
  
  img {
    width: 100%;
    display: block;
  }
  
  /* HERO */
  .hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255,255,255,0.4);
  }
  
  .hero-top,
  .hero-bottom {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    letter-spacing: 0.2em;
    color: #777;
  }
  
  .hero-content h1 {
    font-size: clamp(60px, 10vw, 140px);
    font-weight: 300;
    line-height: 1;
    margin-bottom: 30px;
    background: linear-gradient(to right, #ff9fc5, #9abfff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  
  .hero-content p {
    max-width: 700px;
    line-height: 1.9;
    color: #555;
  }
  
  /* FILTER NAVIGATION (上部フィルターボタンのデザイン) */
  .filter-container {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
    padding: 0 7%;
  }
  
  .filter-btn {
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(0, 0, 0, 0.08);
    padding: 10px 24px;
    font-size: 14px;
    letter-spacing: 0.05em;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    color: #555;
  }
  
  .filter-btn:hover {
    background: rgba(255, 255, 255, 1);
    border-color: #ff9fc5;
    color: #111;
  }
  
  .filter-btn.active {
    background: #111;
    color: #fff;
    border-color: #111;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  }
  
  /* GALLERY */
  .gallery-section {
    overflow: hidden; 
    padding: 40px 0;
    width: 100%;
    user-select: none;
  }
  
  .gallery-track {
    display: flex;
    gap: 24px;
    width: max-content;
    will-change: transform;
    animation: infinite-scroll 45s linear infinite; 
  }
  
  .gallery-track:hover {
    animation-play-state: paused;
  }
  
  @keyframes infinite-scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
  }
  
  .gallery-item {
    width: 360px;
    height: 260px; 
    flex-shrink: 0;
    border-radius: 32px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 10px 30px rgba(255,182,193,0.15);
    background: transparent; 
    transition: opacity 0.3s ease, transform 0.3s ease;
  }
  
  .gallery-item a {
    display: block;
    width: 100%;
    height: 100%;
  }
  
  .gallery-item img {
    width: 100%;
    height: 260px; 
    object-fit: cover; 
    object-position: center top; 
    transition: 0.7s ease;
    pointer-events: none;
  }
  
  .gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(255,182,193,0.45), rgba(255,255,255,0.05));
    display: flex;
    align-items: flex-end;
    padding: 30px;
    opacity: 0;
    transition: 0.5s;
    backdrop-filter: blur(3px);
  }
  
  .gallery-overlay p {
    color: white;
    font-size: 28px;
    font-weight: 300;
    transform: translateY(20px);
    transition: 0.5s;
  }
  
  .gallery-item:hover img {
    transform: scale(1.08);
    filter: brightness(0.75);
  }
  
  .gallery-item:hover .gallery-overlay { opacity: 1; }
  .gallery-item:hover .gallery-overlay p { transform: translateY(0); }
  
  /* ARCHIVE */
  .label {
    font-size: 12px;
    letter-spacing: 0.3em;
    color: #777;
    margin-bottom: 20px;
  }
  
  .section-title { margin-bottom: 60px; }
  .section-title h2 { font-size: 56px; font-weight: 300; }
  .card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
  
  .pc-card {
    background: rgba(255,255,255,0.7);
    border: 1px solid rgba(255,255,255,0.5);
    border-radius: 32px;
    overflow: hidden;
    transition: 0.4s;
    backdrop-filter: blur(20px);
    box-shadow: 0 10px 30px rgba(180,180,255,0.08);
  }
  
  .pc-image {
    aspect-ratio: 4/3;
    background: radial-gradient(circle at top left, rgba(255,255,255,0.9), transparent 30%),
                linear-gradient(to bottom right, #ffd6e8, #dbe8ff);
  }
  
  .image2 { background: linear-gradient(to bottom right, #d6e8ff, #edf3ff); }
  .image3 { background: linear-gradient(to bottom right, #ffe0ec, #f5f0ff); }
  
  .card-content { padding: 30px; }
  .card-content h3 { font-size: 32px; font-weight: 300; margin-bottom: 10px; }
  .type { color: #888; margin-bottom: 25px; }
  .description { line-height: 1.8; color: #555; }
  
  /* MODAL */
  .modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 999;
    backdrop-filter: blur(8px);
  }
  
  .modal.active { display: flex; }
  
  .modal-content {
    background: rgba(255, 255, 255, 0.95);
    width: min(900px, 90vw);
    max-height: 85vh;
    overflow-y: auto;
    padding: 50px;
    position: relative;
    border-radius: 32px; 
    box-shadow: 0 20px 50px rgba(0,0,0,0.1);
  }
  
  #close {
    position: absolute;
    top: 25px;
    right: 25px;
    border: none;
    background: none;
    font-size: 2.5rem;
    cursor: pointer;
    color: #999;
    font-weight: 200;
    transition: 0.3s;
  }
  #close:hover { color: #111; }
  
  .museum-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
  }
  
  .museum-image img {
    width: 100%;
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
  }
  
  .museum-number { color: #ff9fc5; letter-spacing: 0.15em; font-size: 14px; margin-bottom: 5px; }
  #pcSubtitle { font-size: 36px; font-weight: 300; margin-bottom: 15px; }
  .basic-info { color: #666; font-size: 15px; }
  
  .museum-section {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid rgba(0,0,0,0.05);
  }
  .museum-section h3 { font-size: 18px; font-weight: 400; margin-bottom: 20px; color: #333; }
  
  /* ★ 5列グリッドへ拡張 */
  .analysis-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
  }
  .analysis-grid div { background: rgba(0,0,0,0.02); padding: 12px; border-radius: 16px; }
  .analysis-grid small { color: #888; display: block; margin-bottom: 5px; font-size: 11px; }
  .analysis-grid p { font-size: 13px; line-height: 1.4; word-break: break-all; }
  
  .tag-area { display: flex; flex-wrap: wrap; gap: 8px; }
  .tag { border: 1px solid #ddd; padding: 6px 14px; font-size: 14px; border-radius: 20px; background: #fff; }
  
  .color-palette { display: flex; gap: 12px; }
  .color-chip { width: 35px; height: 35px; border-radius: 50%; border: 1px solid rgba(0,0,0,0.1); }
  
  blockquote { border-left: 2px solid #ff9fc5; padding-left: 20px; color: #555; font-style: italic; }
  
  /* FOOTER */
  footer {
    border-top: 1px solid rgba(255,255,255,0.5);
    padding: 30px 7%;
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: #777;
    background: rgba(255,255,255,0.4);
    backdrop-filter: blur(10px);
  }
  
  /* RESPONSIVE */
  @media (max-width: 900px) {
    .card-grid, .museum-header { grid-template-columns: 1fr; gap: 30px; }
    .analysis-grid { grid-template-columns: repeat(2, 1fr); }
    .section-title h2 { font-size: 42px; }
    footer { flex-direction: column; gap: 10px; }
    .modal-content { padding: 30px; }
    .filter-container { flex-wrap: wrap; }
  }