:root {
            --bg-color: #f1f4ff;
            --surface-color: #ffffff;
            --text-main: #1a1e2d;
            --text-secondary: #5a627a;
            --text-muted: #8b93ad;
            --border-color: #dbe2f5;
            --accent-bronze: #8c6838;
            --accent-silver: #4d5566;
            --shadow-subtle: 0 4px 20px rgba(30, 42, 80, 0.05);
            --shadow-card: 0 8px 30px rgba(30, 42, 80, 0.08);
            --radius-lg: 18px;
            --radius-md: 12px;
        }

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

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            padding: 0;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 20px 80px 20px;
        }

        /* Hero Header */
        .header-section {
            text-align: center;
            margin-bottom: 50px;
            padding: 30px 10px;
        }

        .badge-category {
            display: inline-block;
            background: #e2e8fc;
            color: #3b4d82;
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 2px;
            text-transform: uppercase;
            padding: 6px 16px;
            border-radius: 30px;
            margin-bottom: 16px;
        }

        .header-title {
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--text-main);
            margin-bottom: 16px;
            line-height: 1.2;
        }

        .header-desc {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto;
        }

        /* Feature Highlight Bar */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin-bottom: 60px;
        }

        .feature-item {
            background: var(--surface-color);
            padding: 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-subtle);
            text-align: center;
        }

        .feature-title {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .feature-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        /* Section Headings */
        .section-header {
            margin: 60px 0 30px 0;
            text-align: center;
        }

        .section-title {
            font-size: 1.9rem;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 10px;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
        }

        /* 16-Image Showcase Grid */
        .gallery-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .gallery-card {
            background: var(--surface-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .gallery-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 35px rgba(30, 42, 80, 0.12);
        }

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

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

        .card-body {
            padding: 20px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .card-index {
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--accent-bronze);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 6px;
        }

        .card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
            line-height: 1.35;
        }

        .card-desc {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* Specifications Showcase - 3 Columns Per Row */
        .specs-section {
            background: var(--surface-color);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 40px;
            margin-top: 60px;
            box-shadow: var(--shadow-card);
        }

        .specs-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 25px;
        }

        .spec-box {
            padding: 20px;
            background: var(--bg-color);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 8px rgba(30, 42, 80, 0.03);
        }

        .spec-label {
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        .spec-value {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.4;
        }

        /* FAQ Section */
        .faq-section {
            margin-top: 70px;
        }

        .faq-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
            margin-top: 30px;
        }

        .faq-card {
            background: var(--surface-color);
            border-radius: var(--radius-md);
            padding: 26px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-subtle);
        }

        .faq-question {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
            display: flex;
            align-items: flex-start;
        }

        .faq-question::before {
            content: "Q";
            display: inline-block;
            background: #e2e8fc;
            color: #3b4d82;
            font-size: 0.8rem;
            font-weight: 800;
            width: 24px;
            height: 24px;
            line-height: 24px;
            text-align: center;
            border-radius: 6px;
            margin-right: 12px;
            flex-shrink: 0;
        }

        .faq-answer {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            padding-left: 36px;
        }

        /* Footer */
        .footer-note {
            text-align: center;
            margin-top: 70px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .gallery-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
            .header-title {
                font-size: 2.3rem;
            }
        }

        @media (max-width: 768px) {
            .gallery-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .specs-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .container {
                padding: 20px 14px 60px 14px;
            }
            .header-title {
                font-size: 1.85rem;
            }
            .header-desc {
                font-size: 0.95rem;
            }
            .specs-section {
                padding: 25px 20px;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 540px) {
            .gallery-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .specs-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .header-title {
                font-size: 1.6rem;
            }
        }