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

body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    line-height: 1.8;
    color: #333;
    background-color: #f5f5f5;
}

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

.header {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: bold;
    color: #f39c12;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 40px;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
    padding: 5px 10px;
}

.nav a:hover {
    color: #f39c12;
}

.banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.banner::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></svg>');
    opacity: 0.3;
}

.banner h1 {
    font-size: 48px;
    margin-bottom: 20px;
    position: relative;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.banner p {
    font-size: 20px;
    max-width: 800px;
    margin: 0 auto 30px;
    position: relative;
}

.banner-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 40px;
    flex-wrap: wrap;
    position: relative;
}

.feature-item {
    background: rgba(255,255,255,0.15);
    padding: 20px 30px;
    border-radius: 10px;
    backdrop-filter: blur(5px);
}

.feature-item .icon {
    font-size: 36px;
    display: block;
    margin-bottom: 10px;
}

.feature-item .text {
    font-size: 14px;
}

.section {
    padding: 60px 0;
    background: #fff;
    margin: 20px 0;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.section:nth-child(even) {
    background: #f8f9fa;
}

.section-title {
    text-align: center;
    font-size: 32px;
    color: #1a1a2e;
    margin-bottom: 40px;
    position: relative;
}

.section-title::after {
    content: "";
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 15px auto 0;
    border-radius: 2px;
}

.section-title .emoji {
    margin-right: 10px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 0 20px;
}

.product-card {
    background: #fff;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #eee;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.product-card .icon {
    font-size: 50px;
    margin-bottom: 20px;
    display: block;
}

.product-card h3 {
    font-size: 22px;
    color: #1a1a2e;
    margin-bottom: 15px;
}

.product-card p {
    color: #666;
    font-size: 15px;
    line-height: 1.8;
}

.about-content {
    display: flex;
    gap: 40px;
    align-items: center;
    flex-wrap: wrap;
    padding: 0 20px;
}

.about-text {
    flex: 1;
    min-width: 300px;
}

.about-text h3 {
    font-size: 24px;
    color: #1a1a2e;
    margin-bottom: 20px;
}

.about-text p {
    color: #555;
    line-height: 2;
    margin-bottom: 15px;
}

.about-stats {
    flex: 1;
    min-width: 300px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.stat-item {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 25px;
    border-radius: 10px;
    text-align: center;
}

.stat-item .number {
    font-size: 36px;
    font-weight: bold;
    display: block;
}

.stat-item .label {
    font-size: 14px;
    opacity: 0.9;
}

.news-list {
    padding: 0 20px;
}

.news-item {
    display: flex;
    gap: 25px;
    padding: 25px;
    border-bottom: 1px solid #eee;
    transition: background 0.3s;
}

.news-item:hover {
    background: #f8f9fa;
}

.news-item:last-child {
    border-bottom: none;
}

.news-date {
    min-width: 80px;
    color: #999;
    font-size: 14px;
    text-align: center;
    padding: 10px;
    background: #f5f5f5;
    border-radius: 8px;
    height: fit-content;
}

.news-date .day {
    font-size: 28px;
    font-weight: bold;
    color: #667eea;
    display: block;
}

.news-content h3 {
    font-size: 20px;
    color: #1a1a2e;
    margin-bottom: 10px;
    transition: color 0.3s;
}

.news-item:hover .news-content h3 {
    color: #667eea;
}

.news-content p {
    color: #666;
    line-height: 1.8;
}

.news-content .tags {
    margin-top: 10px;
}

.news-content .tag {
    display: inline-block;
    background: #e8e8e8;
    color: #666;
    padding: 3px 12px;
    border-radius: 15px;
    font-size: 12px;
    margin-right: 8px;
}

.contact-section {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    padding: 80px 0;
}

.contact-section .section-title {
    color: #fff;
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    padding: 0 20px;
}

.contact-card {
    background: rgba(255,255,255,0.1);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
}

.contact-card .icon {
    font-size: 50px;
    margin-bottom: 20px;
    display: block;
}

.contact-card h4 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #f39c12;
}

.contact-card p {
    color: rgba(255,255,255,0.9);
    line-height: 1.8;
}

.contact-form {
    max-width: 600px;
    margin: 40px auto 0;
    padding: 0 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    background: rgba(255,255,255,0.95);
    color: #333;
}

.form-group textarea {
    height: 120px;
    resize: vertical;
}

.submit-btn {
    width: 100%;
    padding: 15px 40px;
    background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(243, 156, 18, 0.4);
}

.footer {
    background: #0a0a15;
    color: #888;
    padding: 40px 0 20px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #888;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #f39c12;
}

.footer p {
    margin-bottom: 10px;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
    transition: opacity 0.3s;
}

.back-to-top.visible {
    display: flex;
}

.back-to-top:hover {
    opacity: 0.8;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 28px;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #1a1a2e;
        flex-direction: column;
        padding: 20px;
        gap: 15px;
    }

    .nav.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

    .banner h1 {
        font-size: 32px;
    }

    .banner p {
        font-size: 16px;
    }

    .section-title {
        font-size: 26px;
    }

    .about-content {
        flex-direction: column;
    }

    .news-item {
        flex-direction: column;
        gap: 15px;
    }

    .news-date {
        display: flex;
        align-items: center;
        gap: 10px;
        width: fit-content;
    }

    .news-date .day {
        font-size: 20px;
    }
}

.highlight {
    color: #667eea;
    font-weight: bold;
}

.badge {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    margin-left: 10px;
}

.additional-content {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 60px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 0 20px;
}

.feature-card {
    background: #fff;
    padding: 35px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    border-left: 4px solid #667eea;
}

.feature-card h4 {
    font-size: 20px;
    color: #1a1a2e;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-card p {
    color: #666;
    line-height: 1.8;
}

.partners-section {
    padding: 60px 0;
    background: #fff;
}

.partners-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
    padding: 0 20px;
}

.partner-item {
    font-size: 24px;
    color: #999;
    transition: color 0.3s;
}

.partner-item:hover {
    color: #667eea;
}

.testimonials {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 80px 0;
    color: #fff;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 0 20px;
}

.testimonial-card {
    background: rgba(255,255,255,0.15);
    padding: 30px;
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.testimonial-card p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
    font-style: italic;
}

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

.testimonial-card .avatar {
    width: 50px;
    height: 50px;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.testimonial-card .name {
    font-weight: bold;
}

.testimonial-card .role {
    font-size: 14px;
    opacity: 0.8;
}