/* ----------------------------------
       Base & Reset Style
    ---------------------------------- */
    :root {
      --primary-color: #E60012;   /* ポニーキャニオンレッド */
      --accent-color: #D4AF37;    /* アニバーサリーゴールド */
      --bg-light: #F9F9F9;        /* ベース背景 */
      --text-main: #222222;       /* メインテキスト */
      --text-sub: #666666;        /* 補足テキスト */
      --border-color: #E0E0E0;    /* 枠線色 */
      --white: #FFFFFF;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.7;
      word-wrap: break-word;
    }

    a {
      color: var(--primary-color);
      text-decoration: none;
    }

    ul, ol {
      list-style: none;
    }

    /* ----------------------------------
       Layout Components
    ---------------------------------- */
    .container {
      max-width: 960px;
      margin: 0 auto;
      padding: 0 20px;
    }

    section {
      padding: 60px 0;
      border-bottom: 1px solid var(--border-color);
      background-color: var(--white);
    }

    section:nth-child(even) {
      background-color: var(--bg-light);
    }

    .section-title {
      text-align: center;
      font-size: 1.8rem;
      font-weight: bold;
      margin-bottom: 30px;
      position: relative;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background-color: var(--primary-color);
      margin: 10px auto 0;
    }

    .sub-title {
      text-align: center;
      font-size: 1.1rem;
      color: var(--text-sub);
      margin-top: -20px;
      margin-bottom: 40px;
    }

    /* ----------------------------------
       Header
    ---------------------------------- */
    header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(5px);
      border-bottom: 1px solid var(--border-color);
      z-index: 100;
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 60px;
    }

    .header-logo-img {
      height: 36px;
      width: auto;
      display: block;
    }

    .nav-links {
      display: flex;
      gap: 20px;
      font-size: 0.9rem;
    }

    .nav-links a {
      color: var(--text-main);
      font-weight: 500;
    }

    .nav-links a:hover {
      color: var(--primary-color);
    }

    /* ----------------------------------
       Hero / First View (背景画像 & ヘッダー画像)
    ---------------------------------- */
    .hero {
      position: relative;
      text-align: center;
      padding: 80px 20px;
      color: var(--white);
      background-image: url(./haikei.jpg);
      background-size: cover;
      background-position: top;
      background-repeat: no-repeat;
    }

    .hero-badge {
      display: inline-block;
      background-color: var(--accent-color);
      color: var(--white);
      font-weight: bold;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.9rem;
      margin-bottom: 25px;
    }

    .hero-title-img {
      max-width: 100%;
      width: 580px;
      height: auto;
      display: block;
      margin: 0 auto 25px;
/*      filter: drop-shadow(0px 4px 8px rgba(0,0,0,0.5)); */
    }

    .hero-lead {
      font-size: 1rem;
      color: var(--text-sub);
      max-width: 680px;
      margin: 0 auto 30px;
    }

    .hero-period {
      display: inline-block;
      background-color: rgba(255, 255, 255, 0.95);
      color: var(--primary-color);
      border: 2px solid var(--primary-color);
      padding: 10px 24px;
      font-weight: bold;
      font-size: 1.2rem;
      border-radius: 4px;
      box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    }

    /* ----------------------------------
       Grid & Cards
    ---------------------------------- */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 20px;
    }

    .card {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 24px;
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .card-highlight {
      border: 2px solid var(--primary-color);
      box-shadow: 0 4px 12px rgba(230, 0, 18, 0.15);
      background-color: #FFFDFD;
    }

    .card-top-tag {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background-color: var(--primary-color);
      color: var(--white);
      font-size: 0.75rem;
      font-weight: bold;
      padding: 2px 12px;
      border-radius: 12px;
      letter-spacing: 1px;
    }

    .card-badge {
      font-size: 0.85rem;
      color: var(--primary-color);
      font-weight: bold;
      margin-bottom: 8px;
    }

    .card h3 {
      font-size: 1.2rem;
      margin-bottom: 12px;
    }

    .card-img {
      max-width: 100%;
      height: auto;
      border-radius: 6px;
      border: 1px solid var(--border-color);
      margin-top: 20px;
      margin-bottom: 20px;
    }

/*
    .cdstand-img {
      height: 220px;
      width: auto;
      margin: 10px auto;
      display: block;
    }
*/

    .special-card-body {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .special-img {
      width: 180px;
      max-width: 100%;
      height: auto;
      border-radius: 6px;
      border: 1px solid var(--border-color);
      flex-shrink: 0;
    }

    /* ----------------------------------
       Sticker Grid
    ---------------------------------- */
    .sticker-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: 15px;
      margin-top: 30px;
    }

    .sticker-item {
      background: var(--bg-light);
      border: 1px dashed var(--border-color);
      border-radius: 6px;
      padding: 20px 10px;
      text-align: center;
    }

    .sticker-placeholder {
      width: auto;
      height: 140px;
/*      background-color: #e2e8f0; */
      margin: 0 auto 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      color: var(--text-sub);
      border-radius: 4px;
    }

    .sticker-img {
      height: 140px;
      width: auto;
      display: block;
    }

    /* ----------------------------------
       Buttons & CTA
    ---------------------------------- */
    .btn {
      display: inline-block;
      width: 100%;
      max-width: 360px;
      padding: 14px 24px;
      background-color: var(--primary-color);
      color: var(--white);
      font-weight: bold;
      text-align: center;
      border-radius: 6px;
      transition: opacity 0.2s;
      margin: 20px auto 0;
    }

    .btn:hover {
      opacity: 0.9;
      color: var(--white);
    }

    .btn-center {
      text-align: center;
    }

    /* ----------------------------------
       Step List (SNS Campaign)
    ---------------------------------- */
    .step-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
      margin-bottom: 25px;
    }

    .step-item {
      display: flex;
      align-items: flex-start;
      gap: 15px;
      background: var(--bg-light);
      padding: 15px;
      border-radius: 6px;
    }

    .step-num {
      background-color: var(--text-main);
      color: var(--white);
      font-weight: bold;
      font-size: 0.85rem;
      padding: 2px 8px;
      border-radius: 4px;
      white-space: nowrap;
    }

    .step-content {
      width: 100%;
      min-width: 0;
    }

    .step-sample-images {
      display: flex;
      gap: 12px;
      margin-top: 15px;
      flex-wrap: wrap;
    }

    .step-sample-img {
      width: 100%;
      max-width: 320px;
      height: auto;
      border-radius: 6px;
      border: 1px solid var(--border-color);
      box-shadow: 0 2px 4px rgba(0,0,0,0.05);
      object-fit: contain;
    }

    /* ----------------------------------
       Accordion (Notes)
    ---------------------------------- */
    details {
      margin-top: 25px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      background-color: var(--white);
    }

    summary {
      padding: 12px 16px;
      font-weight: bold;
      cursor: pointer;
      font-size: 0.9rem;
      color: var(--text-sub);
      user-select: none;
    }

    details[open] summary {
      border-bottom: 1px solid var(--border-color);
    }

    .notes-content {
      padding: 16px;
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    .notes-content ul {
      list-style-type: disc;
      padding-left: 20px;
    }

    .notes-content li {
      margin-bottom: 6px;
    }

    /* ----------------------------------
       Banner Section
    ---------------------------------- */
    .banner-section {
      padding: 50px 0;
      background-color: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }

    .banner-container {
      display: flex;
      flex-direction: column;
      gap: 35px;
      align-items: center;
    }

    .prime-banner-link {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 20px;
      width: 100%;
      max-width: 640px;
      padding: 20px 24px;
      background-color: var(--white);
      border: 2px solid var(--primary-color);
      border-radius: 8px;
      color: var(--text-main);
      transition: transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    }

    .prime-banner-link:hover {
      transform: translateY(-2px);
      box-shadow: 0 5px 15px rgba(230, 0, 18, 0.15);
    }

    .prime-icon {
      max-width: 80px;
      height: auto;
      flex-shrink: 0;
    }

    .prime-text {
      font-size: 0.95rem;
      font-weight: bold;
      line-height: 1.5;
      text-align: left;
    }

    .prime-text .highlight {
      color: var(--primary-color);
      display: block;
      margin-top: 4px;
      font-size: 0.85rem;
    }

    .anniversary-banner-link {
      display: block;
      max-width: 500px;
      width: 100%;
      transition: opacity 0.2s;
    }

    .anniversary-banner-link:hover {
      opacity: 0.9;
    }

    .anniversary-banner-img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    /* ----------------------------------
       Footer & Contact
    ---------------------------------- */
    footer {
      background-color: #1A1A1A;
      color: #999999;
      padding: 40px 0;
      font-size: 0.85rem;
    }

    .footer-content {
      text-align: center;
    }

    .footer-content a {
      color: var(--white);
    }

    /* ----------------------------------
       Responsive Mobile Adjustments
    ---------------------------------- */
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hero {
        padding: 50px 20px;
      }
      .hero-title-img {
        width: 85%;
      }
      .hero-period {
        font-size: 1rem;
      }
      .section-title {
        font-size: 1.5rem;
      }
      .grid-3 {
        grid-template-columns: 1fr;
      }
      .special-card-body {
        flex-direction: column;
        align-items: flex-start;
      }
      .special-img {
        width: 100%;
        max-width: 240px;
        margin: 0 auto;
      }
      .step-sample-images {
        flex-direction: column;
      }
      .step-sample-img {
        max-width: 100%;
      }
      .prime-banner-link {
        flex-direction: column;
        text-align: center;
        padding: 18px;
        gap: 12px;
      }
      .prime-text {
        text-align: center;
        font-size: 0.9rem;
      }
    }