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

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        line-height: 1.6;
        color: #333;
        background: #fff;
    }

    .hed19-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        z-index: 1000;
        transition: all 0.3s ease;
    }

    .hed19-nav {
        max-width: 1200px;
        margin: 0 auto;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 20px;
        height: 70px;
    }

    .hed19-logo img {
        height: 40px;
        width: auto;
    }

    .hed19-menu-toggle {
        display: none;
        flex-direction: column;
        background: none;
        border: none;
        cursor: pointer;
        padding: 5px;
    }

    .hed19-menu-toggle span {
        width: 25px;
        height: 3px;
        background: #333;
        margin: 3px 0;
        transition: 0.3s;
        border-radius: 2px;
    }

    .hed19-nav-menu {
        display: flex;
        align-items: center;
        gap: 40px;
    }

    .hed19-nav-menu a {
        text-decoration: none;
        color: #333;
        font-weight: 500;
        transition: color 0.3s ease;
        position: relative;
    }

    .hed19-nav-menu a:hover {
        color: #4285f4;
    }

    .hed19-nav-menu a.active::after {
        content: '';
        position: absolute;
        bottom: -5px;
        left: 0;
        right: 0;
        height: 2px;
        background: #4285f4;
        border-radius: 1px;
    }

    .hed19-nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .hed19-hero-section {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        padding: 120px 0 80px;
        color: white;
        position: relative;
        overflow: hidden;
    }

    .hed19-hero-bg {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-image: url('images/hero.jpg');
        background-size: cover;
        background-position: center;
        opacity: 0.2;
    }

    .hed19-hero-content {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
        position: relative;
        z-index: 2;
    }

    .hed19-hero-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 60px;
        align-items: center;
    }

    .hed19-hero-text h1 {
        font-size: 3.5rem;
        font-weight: 700;
        margin-bottom: 20px;
        line-height: 1.2;
    }

    .hed19-hero-text p {
        font-size: 1.3rem;
        margin-bottom: 40px;
        opacity: 0.9;
        line-height: 1.6;
    }

    .hed19-hero-buttons {
        display: flex;
        gap: 20px;
        flex-wrap: wrap;
    }

    .hed19-btn-primary {
        background: #ff6b6b;
        color: white;
        padding: 15px 35px;
        border: none;
        border-radius: 50px;
        font-size: 1.1rem;
        font-weight: 600;
        cursor: pointer;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 10px;
        transition: all 0.3s ease;
        box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
    }

    .hed19-btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
    }

    .hed19-btn-secondary {
        background: rgba(255, 255, 255, 0.2);
        color: white;
        padding: 15px 35px;
        border: 2px solid rgba(255, 255, 255, 0.3);
        border-radius: 50px;
        font-size: 1.1rem;
        font-weight: 600;
        cursor: pointer;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 10px;
        transition: all 0.3s ease;
        backdrop-filter: blur(10px);
    }

    .hed19-btn-secondary:hover {
        background: rgba(255, 255, 255, 0.3);
        border-color: rgba(255, 255, 255, 0.5);
    }

    .hed19-hero-image {
        text-align: center;
    }

    .hed19-hero-image img {
        max-width: 100%;
        height: auto;
        border-radius: 20px;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    }

    .hed19-stats-section {
        background: #f8f9fa;
        padding: 80px 0;
    }

    .hed19-stats-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .hed19-stats-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 40px;
    }

    .hed19-stat-item {
        text-align: center;
        padding: 40px 20px;
        background: white;
        border-radius: 20px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        transition: transform 0.3s ease;
    }

    .hed19-stat-item:hover {
        transform: translateY(-5px);
    }

    .hed19-stat-number {
        font-size: 3rem;
        font-weight: 700;
        color: #4285f4;
        margin-bottom: 10px;
    }

    .hed19-stat-label {
        font-size: 1.1rem;
        color: #666;
        font-weight: 500;
    }

    .hed19-features-section {
        padding: 100px 0;
        background: white;
    }

    .hed19-features-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .hed19-section-header {
        text-align: center;
        margin-bottom: 80px;
    }

    .hed19-section-title {
        font-size: 2.5rem;
        font-weight: 700;
        color: #333;
        margin-bottom: 20px;
    }

    .hed19-section-subtitle {
        font-size: 1.2rem;
        color: #666;
        max-width: 600px;
        margin: 0 auto;
    }

    .hed19-features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 40px;
    }

    .hed19-feature-card {
        padding: 40px;
        background: #f8f9fa;
        border-radius: 20px;
        transition: all 0.3s ease;
        border: 2px solid transparent;
    }

    .hed19-feature-card:hover {
        transform: translateY(-5px);
        border-color: #4285f4;
        box-shadow: 0 15px 35px rgba(66, 133, 244, 0.1);
    }

    .hed19-feature-icon {
        font-size: 3rem;
        margin-bottom: 20px;
        display: block;
    }

    .hed19-feature-title {
        font-size: 1.5rem;
        font-weight: 600;
        color: #333;
        margin-bottom: 15px;
    }

    .hed19-feature-desc {
        color: #666;
        line-height: 1.7;
    }

    .hed19-products-section {
        padding: 100px 0;
        background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    }

    .hed19-products-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .hed19-products-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 40px;
        margin-top: 60px;
    }

    .hed19-product-card {
        background: white;
        border-radius: 20px;
        padding: 40px;
        box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
    }

    .hed19-product-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, #4285f4, #34a853, #fbbc05, #ea4335);
    }

    .hed19-product-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    }

    .hed19-product-name {
        font-size: 1.8rem;
        font-weight: 700;
        color: #333;
        margin-bottom: 15px;
    }

    .hed19-product-highlight {
        background: #4285f4;
        color: white;
        padding: 5px 15px;
        border-radius: 20px;
        font-size: 0.9rem;
        font-weight: 500;
        display: inline-block;
        margin-bottom: 20px;
    }

    .hed19-product-desc {
        color: #666;
        line-height: 1.7;
    }

    .hed19-testimonials-section {
        padding: 100px 0;
        background: white;
    }

    .hed19-testimonials-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .hed19-testimonials-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 30px;
        margin-top: 60px;
    }

    .hed19-testimonial-card {
        background: #f8f9fa;
        padding: 30px;
        border-radius: 20px;
        position: relative;
        transition: transform 0.3s ease;
    }

    .hed19-testimonial-card:hover {
        transform: translateY(-5px);
    }

    .hed19-testimonial-content {
        font-style: italic;
        color: #555;
        line-height: 1.7;
        margin-bottom: 20px;
    }

    .hed19-testimonial-author {
        display: flex;
        align-items: center;
        gap: 15px;
    }

    .hed19-testimonial-avatar {
        font-size: 2.5rem;
    }

    .hed19-testimonial-info h4 {
        font-weight: 600;
        color: #333;
        margin-bottom: 5px;
    }

    .hed19-testimonial-info p {
        color: #666;
        font-size: 0.9rem;
    }

    .hed19-testimonial-rating {
        position: absolute;
        top: 20px;
        right: 20px;
        color: #ffc107;
        font-size: 1.2rem;
    }

    .hed19-cta-section {
        padding: 100px 0;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        text-align: center;
    }

    .hed19-cta-container {
        max-width: 800px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .hed19-cta-title {
        font-size: 2.5rem;
        font-weight: 700;
        margin-bottom: 20px;
    }

    .hed19-cta-desc {
        font-size: 1.2rem;
        margin-bottom: 40px;
        opacity: 0.9;
    }

    .hed19-cta-buttons {
        display: flex;
        justify-content: center;
        gap: 20px;
        flex-wrap: wrap;
    }

    .hed19-footer {
        background: #1a1a1a;
        color: white;
        padding: 60px 0 30px;
    }

    .hed19-footer-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    .hed19-footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 40px;
    }

    .hed19-footer-brand h3 {
        font-size: 1.5rem;
        margin-bottom: 15px;
        color: #4285f4;
    }

    .hed19-footer-brand p {
        color: #ccc;
        line-height: 1.6;
    }

    .hed19-footer-section h4 {
        font-size: 1.1rem;
        margin-bottom: 20px;
        color: white;
    }

    .hed19-footer-section ul {
        list-style: none;
    }

    .hed19-footer-section ul li {
        margin-bottom: 10px;
    }

    .hed19-footer-section ul li a {
        color: #ccc;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    .hed19-footer-section ul li a:hover {
        color: #4285f4;
    }

    .hed19-footer-bottom {
        border-top: 1px solid #333;
        padding-top: 30px;
        text-align: center;
        color: #999;
    }

    @media (max-width: 768px) {
        .hed19-menu-toggle {
            display: flex;
        }

        .hed19-nav-menu {
            display: none;
            position: fixed;
            top: 70px;
            left: 0;
            right: 0;
            background: white;
            flex-direction: column;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .hed19-nav-menu.active {
            display: flex;
        }

        .hed19-hero-grid {
            grid-template-columns: 1fr;
            gap: 40px;
            text-align: center;
        }

        .hed19-hero-text h1 {
            font-size: 2.5rem;
        }

        .hed19-hero-text p {
            font-size: 1.1rem;
        }

        .hed19-hero-buttons {
            justify-content: center;
        }

        .hed19-stats-grid {
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }

        .hed19-features-grid {
            grid-template-columns: 1fr;
            gap: 30px;
        }

        .hed19-products-grid {
            grid-template-columns: 1fr;
            gap: 30px;
        }

        .hed19-testimonials-grid {
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .hed19-footer-grid {
            grid-template-columns: 1fr;
            gap: 30px;
        }

        .hed19-cta-title {
            font-size: 2rem;
        }

        .hed19-cta-buttons {
            flex-direction: column;
            align-items: center;
        }
    }

    @media (max-width: 480px) {
        .hed19-hero-text h1 {
            font-size: 2rem;
        }

        .hed19-section-title {
            font-size: 2rem;
        }

        .hed19-feature-card,
        .hed19-product-card,
        .hed19-testimonial-card {
            padding: 25px;
        }

        .hed19-btn-primary,
        .hed19-btn-secondary {
            padding: 12px 25px;
            font-size: 1rem;
        }
    }