:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #27ae60;
            --shadow: 0 4px 6px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #ffffff;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* Video Section */
        .video-section {
            background: white;
            padding: 3rem 0;
            text-align: center;
        }
        
        .video-section h2 {
            color: var(--primary);
            margin-bottom: 1.5rem;
            font-size: 2rem;
        }
        
        .video-container {
            max-width: 900px;
            margin: 0 auto;
            box-shadow: var(--shadow);
            border-radius: 8px;
            overflow: hidden;
        }
        
        .video-wrapper {
            position: relative;
            padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
            height: 0;
        }
        
        .video-wrapper iframe {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border: none;
        }
        
        .video-caption {
            background: var(--primary);
            color: white;
            padding: 1rem;
            font-size: 0.9rem;
        }
        
        /* Hero Section - Modified */
        .hero-section {
            background: white;
            padding: 3rem 0;
            text-align: center;
        }
        
        .hero-section h1 {
            font-size: 2.2rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            color: var(--primary);
        }
        
        .hero-subtitle {
            font-size: 1.1rem;
            color: #666;
            max-width: 800px;
            margin: 0 auto 2rem;
        }
        
        .trust-badges {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin: 2rem 0;
            flex-wrap: wrap;
        }
        
        .badge {
            background: var(--light);
            padding: 1rem;
            border-radius: 8px;
            text-align: center;
            min-width: 120px;
            border: 1px solid #ddd;
            position: relative;
        }
        
        .badge::before {
            content: '';
            display: block;
            width: 40px;
            height: 40px;
            margin: 0 auto 0.5rem;
            background-size: contain;
            background-repeat: no-repeat;
            background-position: center;
        }
        
        .badge:nth-child(1)::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M12 1L3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4zm0 10.99h7c-.53 4.12-3.28 7.79-7 8.94V12H5V6.3l7-3.11v8.8z'/%3E%3C/svg%3E");
        }
        
        .badge:nth-child(2)::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M20 7h-4V5c0-.55-.22-1.05-.59-1.41C15.05 3.22 14.55 3 14 3h-4c-1.1 0-2 .9-2 2v2H4c-1.1 0-2 .9-2 2v11c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V9c0-1.1-.9-2-2-2zM10 5h4v2h-4V5zm10 15H4V9h4v2c0 .55.45 1 1 1h6c.55 0 1-.45 1-1V9h4v11z'/%3E%3C/svg%3E");
        }
        
        .badge:nth-child(3)::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M19 3h-4.18C14.4 1.84 13.3 1 12 1c-1.3 0-2.4.84-2.82 2H5c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2zm-7 0c.55 0 1 .45 1 1s-.45 1-1 1-1-.45-1-1 .45-1 1-1zm0 4c1.66 0 3 1.34 3 3s-1.34 3-3 3-3-1.34-3-3 1.34-3 3-3zm6 12H6v-1.4c0-2 4-3.1 6-3.1s6 1.1 6 3.1V19z'/%3E%3C/svg%3E");
        }
        
        .badge:nth-child(4)::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm-1 17.93c-3.95-.49-7-3.85-7-7.93 0-.62.08-1.21.21-1.79L9 15v1c0 1.1.9 2 2 2v1.93zm6.9-2.54c-.26-.81-1-1.39-1.9-1.39h-1v-3c0-.55-.45-1-1-1H8v-2h2c.55 0 1-.45 1-1V7h2c1.1 0 2-.9 2-2v-.41c2.93 1.19 5 4.06 5 7.41 0 2.08-.8 3.97-2.1 5.39z'/%3E%3C/svg%3E");
        }
        
        /* Content Sections */
        .section {
            padding: 4rem 0;
            background: white;
            margin: 2rem 0;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        
        .section:nth-child(even) {
            background: var(--light);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            color: var(--primary);
        }
        
        .section-title h2 {
            font-size: 2rem;
            position: relative;
            display: inline-block;
            padding-bottom: 1rem;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background: var(--secondary);
        }
        
        /* Product Showcase - Three Products - 修改为1:1正方形 */
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        
        .product-card {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        
        /* 1:1 正方形图片容器 */
        .product-image-container {
            position: relative;
            width: 100%;
            padding-bottom: 100%; /* 1:1 宽高比 */
            background: #f0f0f0;
            overflow: hidden;
        }
        
        .product-image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #666;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        
        .product-image-text {
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-size: 1rem;
        }
        
        .product-content {
            padding: 1.5rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        
        .product-title {
            font-size: 1.3rem;
            margin-bottom: 1rem;
            color: var(--primary);
        }
        
        .product-specs {
            list-style: none;
            padding-left: 0;
            margin-bottom: 1.5rem;
            flex-grow: 1;
        }
        
        .product-specs li {
            margin-bottom: 0.5rem;
            padding-left: 1.5rem;
            position: relative;
        }
        
        .product-specs li:before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--success);
            font-weight: bold;
        }
        
        /* Handles & Spot Sizes Section */
        .handles-section {
            background: white;
            padding: 3rem;
            border-radius: 8px;
            margin: 3rem 0;
            box-shadow: var(--shadow);
        }
        
        .handles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }
        
        .handle-item {
            text-align: center;
        }
        
        /* 1:1 正方形手柄图片容器 */
        .handle-image-container {
            position: relative;
            width: 100%;
            padding-bottom: 100%; /* 1:1 宽高比 */
            margin-bottom: 1rem;
            overflow: hidden;
        }
        
        .handle-image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: #f8f9fa;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #666;
            border: 1px solid #ddd;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        
        .handle-image-text {
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-size: 0.9rem;
        }
        
        .spot-sizes-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
            margin: 2rem 0;
        }
        
        @media (min-width: 768px) {
            .spot-sizes-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }
        
        .spot-size {
            text-align: center;
            padding: 1.5rem;
            background: white;
            border-radius: 8px;
            border: 1px solid #ddd;
        }
        
        .spot-size h4 {
            color: var(--primary);
            margin-bottom: 0.5rem;
        }
        
        /* Internal Links Styling */
        .internal-links {
            background: #f0f7ff;
            padding: 2rem;
            border-radius: 8px;
            margin: 2rem 0;
            border-left: 4px solid var(--secondary);
        }
        
        .internal-links h3 {
            color: var(--primary);
            margin-bottom: 1rem;
        }
        
        .internal-links ul {
            list-style: none;
            padding-left: 0;
        }
        
        .internal-links li {
            margin-bottom: 0.75rem;
            padding-left: 1.5rem;
            position: relative;
        }
        
        .internal-links li:before {
            content: '→';
            position: absolute;
            left: 0;
            color: var(--secondary);
            font-weight: bold;
        }
        
        .internal-links a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
        }
        
        .internal-links a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        
        /* Comparison Table */
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
        }
        
        .comparison-table th {
            background: var(--primary);
            color: white;
            padding: 1rem;
            text-align: center;
        }
        
        .comparison-table td {
            padding: 1rem;
            border: 1px solid #ddd;
            text-align: center;
        }
        
        .comparison-table tr:nth-child(even) {
            background: #f9f9f9;
        }
        
        .feature-check {
            color: var(--success);
            font-weight: bold;
        }
        
        .feature-cross {
            color: var(--accent);
        }
        
        /* ROI Calculator */
        .roi-calculator {
            background: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            margin: 2rem 0;
        }
        
        .roi-inputs {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-bottom: 2rem;
        }
        
        .input-group {
            display: flex;
            flex-direction: column;
        }
        
        .input-group label {
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        
        .input-group input {
            padding: 0.75rem;
            border: 1px solid #ddd;
            border-radius: 4px;
        }
        
        .roi-result {
            background: var(--light);
            padding: 1.5rem;
            border-radius: 8px;
            text-align: center;
            margin-top: 2rem;
        }
        
        /* Technical Specifications */
        .specs-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        
        .spec-item {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 4px solid var(--secondary);
        }
        
        .spec-item h4 {
            color: var(--primary);
            margin-bottom: 0.5rem;
            position: relative;
            padding-left: 2rem;
        }
        
        .spec-item h4::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 1.5rem;
            height: 1.5rem;
            background-size: contain;
            background-repeat: no-repeat;
        }
        
        .spec-item:nth-child(1) h4::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M19 9h-4V3H9v6H5l7 7 7-7zM5 18v2h14v-2H5z'/%3E%3C/svg%3E");
        }
        
        .spec-item:nth-child(2) h4::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M12 2c-5.33 4.55-8 8.48-8 11.8 0 4.98 3.8 8.2 8 8.2s8-3.22 8-8.2c0-3.32-2.67-7.25-8-11.8zm3 16H9v-2h6v2zm0-5h-6v-2h6v2zm0-5h-6V6h6v2z'/%3E%3C/svg%3E");
        }
        
        .spec-item:nth-child(3) h4::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M10 18h5v-6h-5v6zm-6 0h5V5H4v13zm12 0h5v-6h-5v6zM10 5v6h11V5H10z'/%3E%3C/svg%3E");
        }
        
        .spec-item:nth-child(4) h4::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M12 1L3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4zm0 10.99h7c-.53 4.12-3.28 7.79-7 8.94V12H5V6.3l7-3.11v8.8z'/%3E%3C/svg%3E");
        }
        
        .spec-item:nth-child(5) h4::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M21 3H3c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h18c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2zm0 16H3V5h18v14zM8 15h2.5l1.5 1.5 1.5-1.5H16v-2.5l1.5-1.5-1.5-1.5V8h-2.5L12 6.5 10.5 8H8v2.5L6.5 12 8 13.5V15zm4-2c.83 0 1.5-.67 1.5-1.5S12.83 10 12 10s-1.5.67-1.5 1.5.67 1.5 1.5 1.5z'/%3E%3C/svg%3E");
        }
        
        .spec-item:nth-child(6) h4::before {
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%233498db'%3E%3Cpath d='M13 3c-4.97 0-9 4.03-9 9H1l4 4 4-4H6c0-3.86 3.14-7 7-7s7 3.14 7 7-3.14 7-7 7c-1.9 0-3.62-.76-4.88-1.99L6.7 18.42C8.32 20.01 10.55 21 13 21c4.97 0 9-4.03 9-9s-4.03-9-9-9zm-1 5v5l4.25 2.52.77-1.29-3.52-2.09V8z'/%3E%3C/svg%3E");
        }
        
        /* Results Showcase Section - 修改为1:1正方形 */
        .results-section {
            background: white;
            padding: 3rem;
            border-radius: 8px;
            margin: 3rem 0;
            box-shadow: var(--shadow);
        }
        
        .results-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }
        
        .result-item {
            text-align: center;
        }
        
        /* 1:1 正方形结果图片容器 */
        .result-image-container {
            position: relative;
            width: 100%;
            padding-bottom: 100%; /* 1:1 宽高比 */
            margin-bottom: 1rem;
            overflow: hidden;
        }
        
        .result-image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: #f8f9fa;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #666;
            border: 1px solid #ddd;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
        }
        
        .result-image-text {
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-size: 0.9rem;
        }
        
        /* Laser Types Sections */
        .laser-types-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }
        
        .laser-type-card {
            background: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            text-align: center;
        }
        
        .laser-type-card h3 {
            color: var(--primary);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light);
        }
        
        .laser-type-card.diode {
            border-top: 4px solid var(--success);
        }
        
        .laser-type-card.alexandrite {
            border-top: 4px solid var(--secondary);
        }
        
        .laser-type-card.ndyag {
            border-top: 4px solid var(--accent);
        }
        
        /* Gold Standard Section */
        .gold-standard {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            padding: 3rem;
            border-radius: 8px;
            margin: 3rem 0;
            border-left: 5px solid #ffd700;
        }
        
        /* FAQ Section */
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            margin-bottom: 1rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            overflow: hidden;
        }
        
        .faq-question {
            padding: 1.5rem;
            background: var(--light);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
        }
        
        .faq-question::after {
            content: '▼';
            color: var(--primary);
            font-size: 0.8rem;
            transition: var(--transition);
        }
        
        .faq-question.active::after {
            transform: rotate(180deg);
        }
        
        .faq-answer {
            padding: 1.5rem;
            background: white;
            display: none;
        }
        
        /* CTA Buttons */
        .cta-button {
            background: var(--accent);
            color: white;
            padding: 0.75rem 1.5rem;
            border-radius: 4px;
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            display: inline-block;
            border: none;
            cursor: pointer;
        }
        
        .cta-button:hover {
            background: #c0392b;
            transform: translateY(-2px);
        }
        
        /* Responsive Design */
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 1.8rem;
            }
            
            .trust-badges {
                flex-direction: column;
                align-items: center;
            }
            
            .products-grid {
                grid-template-columns: 1fr;
            }
            
            .handles-grid, .results-grid {
                grid-template-columns: 1fr;
            }
            
            .comparison-table {
                display: block;
                overflow-x: auto;
            }
            
            .laser-types-grid {
                grid-template-columns: 1fr;
            }
            
            .handles-section {
                padding: 1.5rem;
            }
            
            .results-section {
                padding: 1.5rem;
            }
            
            .badge::before {
                width: 30px;
                height: 30px;
            }
        }
        
        /* 图片上传建议提示 */
        .image-upload-tip {
            background: #e8f4fc;
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
            border-left: 4px solid var(--secondary);
            font-size: 0.9rem;
        }
        
        .image-upload-tip h4 {
            color: var(--primary);
            margin-bottom: 0.5rem;
        }
        
        .image-upload-tip ul {
            padding-left: 1.5rem;
        }
        
        .image-upload-tip li {
            margin-bottom: 0.25rem;
        }