/* ==========================================================================
       Design System & CSS Variables
       Base Canvas Color: #f1f4ff
       Target Audience: Young Global Creatives, Students & Modern Workspaces
       Aesthetic: Clean Desk Setup, Tactile Stationery, Warm Minimalist
       Strict Rules: Zero links (<a>), Zero buttons (<button>), Zero brand/company names
       ========================================================================== */
    :root {
      --bg-canvas: #f1f4ff;
      --bg-surface: #ffffff;
      --bg-surface-elevated: #f8faff;
      --bg-surface-soft: #edf2ff;
      --text-main: #0f172a;
      --text-body: #334155;
      --text-muted: #64748b;
      --text-accent: #3b5998;
      --border-light: #dce5fc;
      --border-accent: #c7d7fc;
      --font-stack: -apple-system, BlinkMacSystemFont, "Plus Jakarta Sans", "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      --shadow-sm: 0 2px 8px rgba(30, 41, 59, 0.04);
      --shadow-md: 0 8px 24px rgba(30, 41, 59, 0.06);
      --radius-xl: 20px;
      --radius-lg: 14px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      background-color: var(--bg-canvas);
      color: var(--text-body);
      font-family: var(--font-stack);
      line-height: 1.65;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      padding: 0;
      margin: 0;
    }

    .page-container {
      max-width: 1140px;
      margin: 0 auto;
      padding: 40px 20px 80px;
    }

    /* Hero Banner */
    .hero-banner {
      background: var(--bg-surface);
      border-radius: var(--radius-xl);
      padding: 48px 36px 42px;
      text-align: center;
      margin-bottom: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }

    .hero-badge {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--text-accent);
      background-color: var(--bg-surface-soft);
      padding: 6px 16px;
      border-radius: 999px;
      margin-bottom: 18px;
      border: 1px solid var(--border-accent);
    }

    .hero-title {
      font-size: 34px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.025em;
      line-height: 1.25;
      margin-bottom: 16px;
    }

    .hero-desc {
      max-width: 760px;
      margin: 0 auto;
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Feature Badges */
    .feature-ribbon {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-bottom: 36px;
    }

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 20px 18px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .feature-indicator {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--text-accent);
      margin-bottom: 10px;
    }

    .feature-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .feature-detail {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.45;
    }

    /* 16-Item Gallery Grid */
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
      margin-bottom: 48px;
    }

    .product-card {
      background: var(--bg-surface);
      border-radius: var(--radius-xl);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

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

    .image-wrapper {
      position: relative;
      width: 100%;
      padding-top: 100%; /* 1:1 Aspect Ratio Guarantee */
      background-color: var(--bg-canvas);
      overflow: hidden;
    }

    .image-wrapper img {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .content-box {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .card-meta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 10px;
    }

    .index-pill {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--text-accent);
      background-color: var(--bg-surface-soft);
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid var(--border-accent);
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .pill-group {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .tag-chip {
      font-size: 12px;
      font-weight: 500;
      color: var(--text-muted);
      background-color: var(--bg-surface-elevated);
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid var(--border-light);
    }

    /* Specifications Matrix */
    .specs-panel {
      background: var(--bg-surface);
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-light);
      padding: 36px 32px;
      margin-bottom: 36px;
      box-shadow: var(--shadow-sm);
    }

    .section-head {
      margin-bottom: 24px;
      text-align: center;
    }

    .section-head h2 {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .section-head p {
      font-size: 14px;
      color: var(--text-muted);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
    }

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

    .specs-table th {
      background-color: var(--bg-surface-elevated);
      color: var(--text-main);
      font-weight: 700;
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-light);
    }

    .specs-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-light);
      color: var(--text-body);
    }

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

    .specs-table tr:nth-child(even) {
      background-color: #fafcff;
    }

    /* FAQ Details/Summary (Zero JS, Zero Buttons) */
    .faq-panel {
      background: var(--bg-surface);
      border-radius: var(--radius-xl);
      border: 1px solid var(--border-light);
      padding: 36px 32px;
      margin-bottom: 36px;
      box-shadow: var(--shadow-sm);
    }

    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      background-color: var(--bg-surface-elevated);
      overflow: hidden;
      transition: background-color 0.2s ease;
    }

    .faq-item[open] {
      background-color: var(--bg-surface);
      border-color: var(--border-accent);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      user-select: none;
      list-style: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

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

    .faq-question::after {
      content: "+";
      font-size: 18px;
      font-weight: 600;
      color: var(--text-accent);
      margin-left: 14px;
    }

    .faq-item[open] .faq-question::after {
      content: "−";
    }

    .faq-answer {
      padding: 0 22px 18px;
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.6;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }

    .footer-note {
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
      padding: 24px 16px 0;
    }

    /* Responsive Queries */
    @media (max-width: 860px) {
      .feature-ribbon {
        grid-template-columns: repeat(2, 1fr);
      }
      .gallery-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }

    @media (max-width: 640px) {
      .page-container {
        padding: 20px 14px 60px;
      }
      .hero-banner {
        padding: 32px 18px;
      }
      .hero-title {
        font-size: 25px;
      }
      .hero-desc {
        font-size: 14px;
      }
      .feature-ribbon {
        grid-template-columns: 1fr;
        gap: 12px;
      }
      .content-box {
        padding: 18px;
      }
      .card-title {
        font-size: 17px;
      }
      .specs-panel, .faq-panel {
        padding: 24px 16px;
      }
      .section-head h2 {
        font-size: 20px;
      }
    }