/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1e3a8a;
    --secondary-color: #3b82f6;
    --accent-color: #f59e0b;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --gray-color: #6b7280;
    --white-color: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--white-color);
}

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

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

ul {
    list-style: none;
}

.text-center {
    text-align: center;
}

/* 导航栏 */
.navbar {
    background-color: var(--white-color);
    box-shadow: var(--shadow);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 0.2rem;
}

.logo-subtitle {
    font-size: 0.9rem;
    color: var(--gray-color);
}

.logo-img {
    height: 48px;
    width: auto;
    display: block;
}

@media (max-width: 768px) {
    .logo-img {
        height: 38px;
    }
}

/* 微信公众号二维码 */
.wechat-qr-code {
    width: 150px;
    height: auto;
    margin-top: 0.8rem;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.qr-hint {
    font-size: 0.85rem;
    color: var(--gray-color);
    margin-top: 0.4rem;
}

.footer-wechat {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 1rem;
    gap: 0.5rem;
}

.footer-qr {
    width: 100px;
    height: 100px;
    border-radius: 6px;
    border: 1px solid rgba(255,255,255,0.2);
}

.footer-wechat span {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.7);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    font-size: 1rem;
    color: var(--dark-color);
    transition: var(--transition);
    padding: 0.5rem 0;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--secondary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 首页横幅 */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white-color);
    padding-top: 80px;
    overflow: hidden;
}

.hero-banner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.85), rgba(59, 130, 246, 0.75));
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease 0.2s;
    animation-fill-mode: both;
}

.hero-desc {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease 0.4s;
    animation-fill-mode: both;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white-color);
    padding: 1rem 2rem;
    border-radius: 5px;
    font-size: 1.1rem;
    transition: var(--transition);
    animation: fadeInUp 1s ease 0.6s;
    animation-fill-mode: both;
}

.cta-button:hover {
    background-color: #d97706;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

/* 区块标题 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--gray-color);
    margin-bottom: 3rem;
}

/* 核心业务 */
.features {
    padding: 5rem 0;
    background-color: var(--light-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--white-color);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--gray-color);
    line-height: 1.8;
}

/* 产品品类 */
.products-preview {
    padding: 5rem 0;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.product-card {
    background-color: var(--light-color);
    border-radius: 10px;
    overflow: hidden;
    transition: var(--transition);
    border: 2px solid transparent;
}

.product-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.product-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-header {
    padding: 1.5rem 1.5rem 0.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.product-icon {
    font-size: 2.5rem;
}

.product-header h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
}

.product-content {
    padding: 0.5rem 1.5rem 1.5rem;
}

.product-content p {
    color: var(--gray-color);
    margin-bottom: 0.8rem;
}

.product-content ul {
    list-style: disc;
    padding-left: 1.5rem;
}

.product-content li {
    padding: 0.3rem 0;
    color: var(--gray-color);
}

/* 关于我们页面 */
.about-intro {
    padding: 5rem 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-text h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.about-text .lead {
    font-size: 1.2rem;
    color: var(--secondary-color);
    font-weight: 500;
    margin-bottom: 1rem;
}

.about-text p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--gray-color);
}

.about-image {
    width: 100%;
    height: 400px;
    border-radius: 10px;
    overflow: hidden;
}

.about-image-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 服务优势 */
.advantages-preview {
    padding: 5rem 0;
    background-color: var(--light-color);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.advantage-item {
    background-color: var(--white-color);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.advantage-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--secondary-color);
    opacity: 0.3;
    margin-bottom: 1rem;
}

.advantage-item h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.advantage-item p {
    color: var(--gray-color);
    line-height: 1.8;
}

/* 数据统计 */
.stats {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 联系我们 */
.contact-preview {
    padding: 5rem 0;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.contact-item {
    text-align: center;
    padding: 2rem;
    background-color: var(--light-color);
    border-radius: 10px;
    transition: var(--transition);
}

.contact-item:hover {
    background-color: var(--secondary-color);
    color: var(--white-color);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

/* 页脚 */
.footer {
    background-color: var(--dark-color);
    color: var(--white-color);
    padding: 3rem 0 1rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--white-color);
}

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

.footer-section li {
    padding: 0.3rem 0;
}

.footer-section a {
    color: var(--gray-color);
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--secondary-color);
}

.footer-section p {
    padding: 0.3rem 0;
    color: var(--gray-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-color);
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: var(--white-color);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow);
        transition: var(--transition);
    }

    .nav-menu.active {
        left: 0;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

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

    .features-grid,
    .products-grid,
    .advantages-grid,
    .contact-info-grid {
        grid-template-columns: 1fr;
    }
}