* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        .product-detail {
            max-width: 1280px;
            margin: 0 auto;
            padding: 3rem 2rem;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background-color: #ffffff;
            color: #1a2c3e;
            line-height: 1.5;
        }
        .product-detail .breadcrumb {
            font-size: 0.85rem;
            color: #6c7a8a;
            margin-bottom: 1.5rem;
        }
        .product-detail h1 {
            font-size: 2.8rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 0.5rem;
            color: #0a2540;
        }
        .product-detail .h1-sub {
            font-size: 1.3rem;
            font-weight: 400;
            color: #3a5a78;
            border-left: 4px solid #2c7da0;
            padding-left: 1rem;
            margin-bottom: 2rem;
        }
        .product-detail h2 {
            font-size: 1.8rem;
            font-weight: 600;
            margin: 2.5rem 0 1rem 0;
            color: #0f3b4c;
            letter-spacing: -0.01em;
        }
        .product-detail h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin: 1.5rem 0 0.5rem 0;
            color: #1e5a6e;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .stat-card {
            background: #f4f8fc;
            border-radius: 24px;
            padding: 1.5rem 0.8rem;
            text-align: center;
            transition: all 0.2s;
            border: 1px solid #e2edf2;
        }
        .stat-card .stat-value {
            font-size: 2.2rem;
            font-weight: 800;
            color: #0f3b4c;
            line-height: 1.2;
        }
        .stat-card .stat-label {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-weight: 600;
            color: #3a6b8c;
            margin-top: 0.4rem;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }
        .feature-card {
            background: #ffffff;
            border-radius: 20px;
            padding: 1.5rem;
            box-shadow: 0 4px 14px rgba(0,0,0,0.03);
            border: 1px solid #eef2f6;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -12px rgba(0,0,0,0.08);
            border-color: #cfdfed;
        }
        .feature-icon {
            font-size: 2.2rem;
            margin-bottom: 1rem;
        }
        .feature-card h3 {
            margin-top: 0;
            margin-bottom: 0.5rem;
        }
        .feature-card p {
            color: #4a627a;
            font-size: 0.9rem;
        }
        .spec-table-wrap {
            overflow-x: auto;
            margin: 1.8rem 0;
            border-radius: 20px;
            border: 1px solid #e9edf2;
            background: #fff;
        }
        .spec-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.9rem;
        }
        .spec-table th, .spec-table td {
            padding: 1rem 1.2rem;
            text-align: left;
            border-bottom: 1px solid #eef2f8;
            vertical-align: top;
        }
        .spec-table th {
            background-color: #f7fafd;
            font-weight: 600;
            color: #0c4a6e;
            width: 30%;
        }
        .spec-table tr:last-child td {
            border-bottom: none;
        }
        .spec-note {
            font-size: 0.8rem;
            color: #6a7f9f;
            margin-top: 6px;
            font-weight: normal;
        }
        .advantage-block {
            background: #fafeff;
            border-radius: 24px;
            padding: 2rem;
            margin: 2rem 0;
            border: 1px solid #e2edf2;
        }
        .advantage-block p {
            margin-bottom: 1rem;
        }
        .list-check {
            list-style: none;
            padding-left: 0;
        }
        .list-check li {
            margin-bottom: 0.75rem;
            padding-left: 1.8rem;
            position: relative;
        }
        .list-check li::before {
            content: "✓";
            color: #2c7da0;
            font-weight: bold;
            position: absolute;
            left: 0;
        }
        .apps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        .app-item {
            background: #f8fafc;
            border-radius: 16px;
            padding: 1rem;
            text-align: center;
            font-weight: 500;
            border: 1px solid #eef2f6;
        }
        .cta-section {
            background: linear-gradient(105deg, #eef4fc 0%, #dfe9f2 100%);
            border-radius: 32px;
            padding: 2.5rem 2rem;
            text-align: center;
            margin: 3rem 0 1rem;
        }
        .btn-primary {
            display: inline-block;
            background-color: #0f3b4c;
            color: white;
            padding: 0.9rem 2.5rem;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1rem;
            transition: all 0.2s;
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background-color: #1b5a72;
            transform: translateY(-2px);
        }
        .download-row {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            margin: 1rem 0;
        }
        .download-link {
            background: white;
            border-radius: 40px;
            padding: 0.4rem 1rem;
            border: 1px solid #cbdde9;
            font-size: 0.85rem;
            text-decoration: none;
            color: #0f3b4c;
        }
        @media (max-width: 640px) {
            .product-detail { padding: 1.5rem; }
            .product-detail h1 { font-size: 1.8rem; }
            .product-detail .h1-sub { font-size: 1rem; }
        }