:root {
      --bg-color: #f1f4ff;
      --card-bg: #ffffff;
      --text-main: #2b2d42;
      --text-muted: #6c757d;
      --text-light: #8d99ae;
      --accent-purple: #8b7ff5;
      --accent-pink: #ff7da7;
      --accent-blue: #5da9e9;
      --accent-yellow: #ffd166;
      --border-color: #e5ebff;
      --shadow-sm: 0 4px 12px rgba(139, 127, 245, 0.06);
      --shadow-md: 0 8px 24px rgba(139, 127, 245, 0.1);
      --shadow-lg: 0 12px 32px rgba(139, 127, 245, 0.14);
      --radius-sm: 12px;
      --radius-md: 18px;
      --radius-lg: 24px;
    }

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

    body {
      background-color: var(--bg-color);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      padding: 24px 16px;
    }

    .page-container {
      max-width: 1200px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 36px;
    }

    /* Header Section */
    .header-banner {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 40px 24px;
      text-align: center;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    .badge-pill {
      display: inline-block;
      padding: 6px 18px;
      background: #e9ecff;
      color: var(--accent-purple);
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      margin-bottom: 14px;
    }

    .header-banner h1 {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.02em;
    }

    .header-banner p {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }

    /* Section Wrapper */
    .section-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    .section-header {
      margin-bottom: 28px;
      text-align: center;
    }

    .section-header h2 {
      font-size: 1.65rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .section-header p {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    /* Grid Layouts */
    .grid-2x2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .grid-4col {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    /* Image Display Card */
    .photo-card {
      background: var(--bg-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      border: 1px solid #dfe5fc;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .photo-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-sm);
    }

    .img-wrapper {
      position: relative;
      width: 100%;
      aspect-ratio: 1 / 1;
      background: #f1f4ff;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .img-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

    .photo-card:hover .img-wrapper img {
      transform: scale(1.03);
    }

    .photo-info {
      padding: 14px 16px;
      background: #ffffff;
      border-top: 1px solid #edf1fc;
    }

    .photo-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--accent-purple);
      text-transform: uppercase;
      letter-spacing: 0.04em;
      margin-bottom: 4px;
    }

    .photo-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .photo-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* Feature Specs Strip */
    .specs-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .spec-item {
      background: #f7f9ff;
      border: 1px solid #e1e7fc;
      border-radius: var(--radius-sm);
      padding: 18px 16px;
      text-align: center;
    }

    .spec-icon {
      font-size: 1.5rem;
      margin-bottom: 8px;
      display: inline-block;
    }

    .spec-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .spec-text {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ Details & Summary Accordion (Pure Semantic HTML, No Buttons, No Links) */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }

    details.faq-item {
      background: #f8faff;
      border: 1px solid #e2e8fc;
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }

    details.faq-item[open] {
      background: #ffffff;
      border-color: var(--accent-purple);
      box-shadow: var(--shadow-sm);
    }

    summary.faq-question {
      padding: 18px 22px;
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    summary.faq-question::-webkit-details-marker {
      display: none;
    }

    summary.faq-question::after {
      content: "+";
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--accent-purple);
      transition: transform 0.2s ease;
    }

    details[open] summary.faq-question::after {
      content: "\2212";
      transform: rotate(180deg);
    }

    .faq-answer {
      padding: 0 22px 20px 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid #f0f3ff;
      padding-top: 14px;
    }

    /* Footer Note (Pure Showcase, No Links, No Buttons, No Brand) */
    .footer-note {
      text-align: center;
      padding: 24px;
      color: var(--text-light);
      font-size: 0.85rem;
    }

    /* Mobile Responsive Breakpoints */
    @media (max-width: 992px) {
      .grid-4col {
        grid-template-columns: repeat(2, 1fr);
      }
      .specs-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      body {
        padding: 16px 12px;
      }
      .header-banner {
        padding: 28px 16px;
      }
      .header-banner h1 {
        font-size: 1.65rem;
      }
      .section-card {
        padding: 24px 16px;
      }
      .grid-2x2 {
        grid-template-columns: 1fr;
      }
      .grid-4col {
        grid-template-columns: 1fr;
      }
      .specs-grid {
        grid-template-columns: 1fr;
      }
      summary.faq-question {
        padding: 14px 16px;
        font-size: 0.95rem;
      }
      .faq-answer {
        padding: 0 16px 16px 16px;
      }
    }