/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a56db;
    --secondary-color: #f97316;
    --dark-color: #0f172a;
    --light-color: #f8fafc;
    --gray-color: #64748b;
    --light-gray: #e2e8f0;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 4px;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #1e40af;
    transform: translateY(-2px);
}

/* 导航栏样式 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo a {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    margin-right: 10px;
}

.nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
}

.nav-links li {
    margin-left: 20px;
}

.nav-links a {
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 12px;
    border-radius: 4px;
}

.nav-links a:hover {
    color: var(--primary-color);
    background-color: var(--light-gray);
}

.mobile-nav-toggle {
    display: none;
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--dark-color);
}

/* 英雄区域样式 */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://picsum.photos/id/1/1920/1080');
    background-size: cover;
    background-position: center;
    color: white;
    text-align: center;
    padding: 20px;
}

.hero-content {
    max-width: 800px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

/* 通用区域标题样式 */
.section-header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 20px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.section-header p {
    color: var(--gray-color);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* 我们的优势区域样式 */
.advantages {
    padding: 100px 0;
    background-color: white;
}

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

.advantage-item {
    background-color: #f8fafc;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    text-align: center;
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.advantage-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin: 0 auto 20px;
}

.advantage-item h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.advantage-item p {
    color: var(--gray-color);
}

/* 产品介绍区域样式 */
.products {
    padding: 100px 0;
    background-color: #f8fafc;
}

.products-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.product-item {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.product-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.product-img img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.product-info {
    padding: 20px;
}

.product-info h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.product-info p {
    color: var(--gray-color);
    margin-bottom: 20px;
}

.product-features li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.product-features i {
    color: var(--primary-color);
    margin-right: 10px;
}

.product-btn {
    margin-top: 20px;
    display: inline-block;
}

/* 新闻资讯区域样式 */
.news {
    padding: 100px 0;
    background-color: white;
}

.news-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.news-item {
    background-color: #f8fafc;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.news-img img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-info {
    padding: 20px;
}

.news-date {
    display: inline-block;
    margin-bottom: 10px;
    color: var(--gray-color);
    font-size: 0.9rem;
}

.news-date i {
    margin-right: 5px;
}

.news-info h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.news-info p {
    color: var(--gray-color);
    margin-bottom: 20px;
}

.news-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    font-weight: 600;
}

.news-link i {
    margin-left: 5px;
    transition: var(--transition);
}

.news-link:hover i {
    transform: translateX(5px);
}

/* 常见问题区域样式 */
.faq {
    padding: 100px 0;
    background-color: #f8fafc;
}

.faq-content {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 20px;
    border-bottom: 1px solid var(--light-gray);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    cursor: pointer;
}

.faq-question h3 {
    font-size: 1.2rem;
}

.faq-question i {
    font-size: 1.2rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer p {
    color: var(--gray-color);
    padding-bottom: 20px;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

/* 页脚样式 */
.footer {
    background-color: var(--dark-color);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-logo a {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: white;
    margin-bottom: 10px;
}

.footer-logo i {
    margin-right: 10px;
}

.footer-logo p {
    color: var(--light-gray);
}

.footer-friend-links h3 {
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.footer-friend-links ul {
    display: flex;
    flex-wrap: wrap;
}

.footer-friend-links li {
    margin-right: 20px;
    margin-bottom: 10px;
}

.footer-friend-links a {
    color: var(--light-gray);
    transition: var(--transition);
}

.footer-friend-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--light-gray);
}

/* 返回顶部按钮样式 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    border: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.back-to-top.active {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: #1e40af;
    transform: translateY(-3px);
}

/* 媒体查询 */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    .section-header h2 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .header .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: white;
        box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    .nav.active {
        max-height: 300px;
    }
    .nav-links {
        flex-direction: column;
        padding: 20px;
    }
    .nav-links li {
        margin: 10px 0;
    }
    .mobile-nav-toggle {
        display: block;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .hero p {
        font-size: 1rem;
    }
    .advantage-item, .product-item, .news-item {
        margin-bottom: 30px;
    }
    .footer-content {
        flex-direction: column;
    }
    .footer-friend-links {
        margin-top: 30px;
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 1.8rem;
    }
    .section-header h2 {
        font-size: 1.8rem;
    }
    .btn {
        padding: 10px 20px;
    }
    .back-to-top {
        width: 40px;
        height: 40px;
        font-size: 16px;
        bottom: 20px;
        right: 20px;
    }
}