* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: #fef3e8;
            color: #2c2418;
            padding: 30px 20px;
        }
        .product-container {
            max-width: 1280px;
            margin: 0 auto;
            background: white;
            border-radius: 32px;
            box-shadow: 0 20px 35px -12px rgba(0,0,0,0.15);
            overflow: hidden;
        }
        /* header */
        .product-header {
            background: linear-gradient(135deg, #ffb7c5 0%, #ff8da1 100%);
            padding: 40px 30px;
            text-align: center;
            color: white;
        }
        .product-header h1 {
            font-size: 2.2rem;
            margin-bottom: 12px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }
        .product-header p {
            font-size: 1.2rem;
            opacity: 0.95;
            margin-bottom: 20px;
        }
        .rating {
            background: rgba(255,255,255,0.2);
            display: inline-block;
            padding: 8px 20px;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 600;
            backdrop-filter: blur(4px);
        }
        /* gallery placeholder */
        .gallery {
            padding: 30px;
            background: #fff5f0;
            text-align: center;
            border-bottom: 1px solid #ffe0d0;
        }
        .img-placeholder {
            background: #ffe6dc;
            border-radius: 24px;
            padding: 70px 20px;
            font-size: 1rem;
            color: #b45a3b;
            border: 2px dashed #ffaa99;
            font-weight: 500;
        }
        /* 2列卖点 */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            padding: 40px 30px;
            background: white;
        }
        .feature-card {
            background: #fefaf6;
            border-radius: 24px;
            padding: 24px;
            transition: all 0.2s ease;
            border: 1px solid #ffe0cf;
        }
        .feature-card h3 {
            font-size: 1.4rem;
            margin-bottom: 12px;
            color: #d45a3b;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feature-card p {
            line-height: 1.5;
            color: #3a2a1f;
        }
        /* 表格样式 */
        .specs-section {
            padding: 20px 30px 40px 30px;
            background: #fefaf5;
        }
        .specs-section h2 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: #c23b22;
            border-left: 6px solid #ff8da1;
            padding-left: 18px;
        }
        .specs-table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0,0,0,0.03);
        }
        .specs-table th, .specs-table td {
            border: 1px solid #ffded0;
            padding: 14px 18px;
            vertical-align: top;
            text-align: left;
        }
        .specs-table th {
            background: #fff0e8;
            width: 35%;
            font-weight: 700;
            color: #a33f25;
        }
        /* 应用场景 */
        .applications {
            background: #fff0ea;
            margin: 20px 30px 30px 30px;
            border-radius: 28px;
            padding: 28px 32px;
        }
        .apps-badge {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 18px;
        }
        .apps-badge span {
            background: white;
            padding: 8px 18px;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 500;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
            color: #a53f26;
        }
        /* accordion FAQ */
        .faq-section {
            padding: 20px 30px 50px 30px;
            background: white;
        }
        .faq-section h2 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: #c23b22;
            border-left: 6px solid #ff8da1;
            padding-left: 18px;
        }
        .accordion-item {
            background: #ffffff;
            border: 1px solid #ffe0cf;
            border-radius: 20px;
            margin-bottom: 16px;
            overflow: hidden;
            transition: all 0.2s;
        }
        .accordion-question {
            background: #fef7f2;
            padding: 18px 24px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            color: #2f241b;
        }
        .accordion-question:hover {
            background: #ffe8df;
        }
        .accordion-question .icon {
            font-size: 1.4rem;
            font-weight: 400;
            transition: transform 0.2s;
        }
        .accordion-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.2s ease;
            background: white;
            border-top: 0px solid #ffe0cf;
            line-height: 1.55;
            color: #3e2c1d;
        }
        .accordion-answer.show {
            padding: 20px 24px;
            max-height: 800px;  /* enough for long answers */
            border-top: 1px solid #ffe0cf;
        }
        .btn-quote {
            display: inline-block;
            background: #e85d4a;
            color: white;
            padding: 14px 32px;
            border-radius: 60px;
            text-decoration: none;
            font-weight: 700;
            margin-top: 20px;
            transition: 0.2s;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }
        .btn-quote:hover {
            background: #c2432f;
            transform: scale(1.02);
        }
        footer {
            background: #2c2418;
            color: #e7cfbe;
            text-align: center;
            padding: 28px 20px;
            font-size: 0.85rem;
        }
        @media (max-width: 680px) {
            .product-header h1 { font-size: 1.6rem; }
            .specs-table th, .specs-table td { display: block; width: 100%; }
            .specs-table tr { margin-bottom: 16px; display: block; border: 1px solid #ffded0; border-radius: 16px; }
            .specs-table th { background: #ffe2d4; }
            .applications { margin: 20px 20px; padding: 20px; }
            .faq-section, .specs-section, .features-grid { padding-left: 20px; padding-right: 20px; }
        }