/* ==========================================================================
       CSS Design System & Variables
       Base Canvas Background: #f1f4ff (Strictly Required)
       Target Audience: Youth, Gen-Z, Pop Art Lovers, Creative Stationery Enthusiasts
       Constraint: Pure Showcase Page - Zero Links (<a>) & Zero Buttons (<button>)
       ========================================================================== */
    :root {
      --bg-canvas: #f1f4ff;
      --bg-card: #ffffff;
      --bg-card-subtle: #f7f9fe;
      --text-main: #131b2e;
      --text-sub: #4b5874;
      --text-muted: #7b8ba6;
      --border-light: #dce4f7;
      --border-accent: #c4d4f7;
      --accent-coral: #ff4d6d;
      --accent-cyan: #06b6d4;
      --accent-purple: #8b5cf6;
      --accent-amber: #f59e0b;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      --shadow-sm: 0 4px 16px rgba(19, 27, 46, 0.05);
      --shadow-md: 0 10px 30px rgba(19, 27, 46, 0.08);
      --radius-main: 16px;
      --radius-badge: 20px;
    }

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

    body {
      background-color: var(--bg-canvas);
      color: var(--text-main);
      font-family: var(--font-family);
      line-height: 1.6;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      padding: 40px 16px 80px;
    }

    .wrapper {
      max-width: 1160px;
      margin: 0 auto;
    }

    /* ==========================================================================
       Header & Hero Introduction
       ========================================================================== */
    .showcase-header {
      text-align: center;
      margin-bottom: 48px;
      padding: 10px 12px 0;
    }

    .pill-badge {
      display: inline-block;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 1.8px;
      text-transform: uppercase;
      color: var(--accent-coral);
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      padding: 6px 18px;
      border-radius: var(--radius-badge);
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(255, 77, 109, 0.12);
    }

    .main-title {
      font-size: 36px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.6px;
      line-height: 1.25;
      margin-bottom: 14px;
    }

    .subtitle-desc {
      font-size: 16px;
      color: var(--text-sub);
      max-width: 780px;
      margin: 0 auto 32px;
      line-height: 1.65;
    }

    /* Key Specs Highlights Strip */
    .specs-strip {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-bottom: 56px;
    }

    .spec-box {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: 12px;
      padding: 18px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .spec-box:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .spec-box h3 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .spec-box p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section Headers */
    .section-title-wrap {
      text-align: center;
      margin: 60px 0 32px;
    }

    .section-title {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.4px;
      margin-bottom: 6px;
    }

    .section-desc {
      font-size: 14px;
      color: var(--text-sub);
    }

    /* ==========================================================================
       Responsive Image Grid (Universal Desktop & Mobile Layout)
       Desktop: 2 Columns | Mobile: 1 Column
       ========================================================================== */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 26px;
      margin-bottom: 40px;
    }

    .product-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-main);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-accent);
    }

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

    .image-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .product-card:hover .image-container img {
      transform: scale(1.025);
    }

    .number-tag {
      position: absolute;
      top: 14px;
      left: 14px;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(6px);
      padding: 4px 12px;
      border-radius: var(--radius-badge);
      font-size: 11px;
      font-weight: 800;
      color: var(--text-main);
      border: 1px solid rgba(220, 228, 247, 0.9);
      z-index: 2;
    }

    .card-content {
      padding: 20px 22px;
      background: var(--bg-card);
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      border-top: 1px solid var(--border-light);
    }

    .card-heading {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .card-paragraph {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.55;
    }

    /* ==========================================================================
       Specifications Table
       ========================================================================== */
    .specs-section {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-main);
      padding: 32px 28px;
      margin: 50px 0 60px;
      box-shadow: var(--shadow-sm);
    }

    .specs-header {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 22px;
      text-align: center;
    }

    .specs-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 14px;
    }

    .specs-table tr {
      border-bottom: 1px solid var(--border-light);
    }

    .specs-table tr:last-child {
      border-bottom: none;
    }

    .specs-table td {
      padding: 14px 16px;
    }

    .specs-table td:first-child {
      font-weight: 700;
      color: var(--text-main);
      width: 32%;
      background: var(--bg-card-subtle);
    }

    .specs-table td:last-child {
      color: var(--text-sub);
    }

    /* ==========================================================================
       FAQ Disclosure Component (Native HTML5 <details> & <summary>)
       Zero <button>, Zero <a> links - Pure CSS & Semantic HTML
       ========================================================================== */
    .faq-block {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-main);
      padding: 36px 30px;
      margin-bottom: 60px;
      box-shadow: var(--shadow-sm);
    }

    .faq-heading {
      font-size: 22px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 24px;
      text-align: center;
    }

    details.faq-entry {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }

    details.faq-entry:last-child {
      border-bottom: none;
    }

    summary.faq-question {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      position: relative;
      padding-right: 28px;
      user-select: none;
    }

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

    summary.faq-question::after {
      content: "+";
      position: absolute;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      font-size: 18px;
      font-weight: 600;
      color: var(--text-muted);
      transition: transform 0.25s ease, color 0.25s ease;
    }

    details[open] summary.faq-question::after {
      content: "−";
      color: var(--accent-coral);
    }

    .faq-body {
      margin-top: 12px;
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* Footer Note (Strictly No Links, No Brand Names) */
    .footer-area {
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
      padding-top: 24px;
      border-top: 1px solid var(--border-light);
    }

    /* ==========================================================================
       Mobile Responsiveness
       ========================================================================== */
    @media (max-width: 768px) {
      body {
        padding: 24px 12px 60px;
      }
      .main-title {
        font-size: 26px;
      }
      .product-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }
      .specs-table td {
        display: block;
        width: 100% !important;
      }
      .specs-table td:first-child {
        background: transparent;
        padding-bottom: 4px;
      }
      .specs-table td:last-child {
        padding-top: 0;
        padding-bottom: 14px;
      }
      .specs-section, .faq-block {
        padding: 24px 18px;
      }
    }