:root {
    --primary-color: #333333;
    --text-color: #333;
    --gradient-start: #f5f5f5;
    --gradient-end: #ffffff;
    --card-bg: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 4rem;
    background: var(--gradient-start);
    box-shadow: 0 2px 15px rgba(0,0,0,0.03);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.main-nav a:hover {
    color: var(--primary-color);
}

.main-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 50%;
    background-color: var(--primary-color);
    transition: all 0.3s;
}

.main-nav a:hover::after {
    width: 100%;
    left: 0;
}

.hero {
    text-align: center;
    padding: 5rem 2rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><rect width="1" height="1" fill="%2333333310"/></svg>') repeat;
    opacity: 0.5;
}

.hero h1 {
    font-size: 3.2rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(45deg, #333333, #666666);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: fadeInUp 0.8s ease-out;
}

.hero h2 {
    font-size: 1.8rem;
    color: #333333;
    margin-bottom: 2rem;
}

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin: 2rem auto 4rem;
    padding: 3rem;
    background: transparent;
}

.qr-item {
    text-align: center;
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.qr-item:hover {
    transform: translateY(-8px);
}

.qr-item img {
    width: 180px;
    height: 180px;
    border: none;
    border-radius: 12px;
    padding: 12px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: box-shadow 0.3s;
}

.qr-item:hover img {
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.qr-item p {
    margin-top: 1rem;
    font-size: 1.1rem;
    color: var(--text-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: bold;
}

.logo-img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.contact-section {
    padding: 6rem 2rem;
    background-color: var(--gradient-start);
    position: relative;
}

.contact-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.contact-content {
    max-width: 1200px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    gap: 2rem;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    width: 300px;
    transform: translateY(0);
    transition: transform 0.3s, box-shadow 0.3s;
}

.info-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}

.info-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    padding: 0.5rem;
    background: var(--gradient-start);
    border-radius: 50%;
}

.info-item h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.info-item p {
    color: #666;
    line-height: 1.5;
}

footer {
    text-align: center;
    padding: 2rem;
    background: var(--primary-color);
    color: rgba(255,255,255,0.85);
}

.about-section {
    margin-top: 2rem;
    max-width: 1200px;
    margin: 3rem auto;
    padding: 2.5rem;
    text-align: left;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    transform: translateY(0);
    transition: transform 0.3s, box-shadow 0.3s;
}

.about-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 25px rgba(0,0,0,0.1);
}

.about-section h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-align: center;
}

.about-desc {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.about-content.vertical {
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.about-content.vertical .product-image {
    max-width: 400px;  /* 可以适当调整图片宽度 */
    width: 100%;
}

.product-image {
    max-width: 300px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

/* 添加动画关键帧 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-nav {
        padding: 1rem 2rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .qr-codes {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }
    
    .about-section {
        margin: 2rem 1rem;
    }
    
    .about-desc {
        font-size: 1rem;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .product-image {
        max-width: 100%;
    }
    
    .about-content.vertical .product-image {
        max-width: 100%;
    }
}

.business-section {
    max-width: 1000px;
    margin: 3rem auto;
    padding: 2.5rem;
}

.business-section h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.business-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.business-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    transition: transform 0.3s, box-shadow 0.3s;
}

.business-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 25px rgba(0,0,0,0.1);
}

.business-card h4 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.business-card p {
    color: #555;
    line-height: 1.8;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .business-cards {
        grid-template-columns: 1fr;
    }
    
    .business-section {
        margin: 2rem 1rem;
        padding: 1.5rem;
    }
}

.product-images {
    display: flex;
    gap: 2rem;  /* 减小间距以适应三张图片 */
    justify-content: center;
    align-items: center;
    width: 100%;
}

.product-images .product-image {
    max-width: 350px;  /* 稍微减小最大宽度 */
    width: 100%;
    height: 300px;
    object-fit: contain;
    background: var(--card-bg);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .product-images {
        flex-wrap: wrap;  /* 允许图片换行 */
    }
}

@media (max-width: 768px) {
    .product-images {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }
    
    .product-images .product-image {
        height: 250px;
    }
}

.video-section {
    margin-top: 3rem;
    padding: 2.5rem;
    text-align: center;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    transform: translateY(0);
    transition: transform 0.3s, box-shadow 0.3s;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.video-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 25px rgba(0,0,0,0.1);
}

.video-section h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.video-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.video-container video {
    width: 100%;
    display: block;
}

@media (max-width: 1200px) {
    .product-images {
        flex-wrap: wrap;  /* 允许图片换行 */
    }
}

@media (max-width: 768px) {
    .product-images {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }
    
    .product-images .product-image {
        height: 250px;
    }
}