/* 全局样式 */
:root {
    --primary-color: #0066cc;
    --secondary-color: #004d99;
    --text-color: #333;
    --light-gray: #f4f4f4;
    --dark-gray: #666;
    --white: #fff;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

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

/* 导航栏样式 */
header {
    background: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.logo h1 {
    font-size: 24px;
    color: var(--primary-color);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li a {
    color: var(--text-color);
    text-decoration: none;
    padding: 10px 20px;
    transition: color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--primary-color);
}

.menu-toggle {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* 主视觉区域样式 */
.hero {
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('../img/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--white);
    margin-top: 80px;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s;
}

.btn:hover {
    background: var(--secondary-color);
}

/* 关于我们样式 */
.about {
    padding: 80px 0;
    background: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

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

.about-image img {
    width: 100%;
    border-radius: 10px;
}

.company-values {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 60px;
}

.value-item {
    text-align: center;
    padding: 30px;
    background: var(--light-gray);
    border-radius: 10px;
    transition: transform 0.3s;
}

.value-item:hover {
    transform: translateY(-10px);
}

.value-item i {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* 服务内容样式 */
.services {
    padding: 80px 0;
    background: var(--light-gray);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.service-item {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s;
}

.service-item:hover {
    transform: translateY(-10px);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-icon i {
    font-size: 32px;
    color: var(--white);
}

/* 产品展示样式 */
.products {
    padding: 80px 0;
    background: var(--white);
}

.product-slider {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.product-item {
    background: var(--light-gray);
    border-radius: 10px;
    overflow: hidden;
}

.product-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.product-info {
    padding: 20px;
}

.product-info h3 {
    margin-bottom: 10px;
}

/* 成功案例样式 */
.cases {
    padding: 80px 0;
    background: var(--light-gray);
}

.case-filter {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 10px 20px;
    margin: 0 10px;
    border: none;
    background: var(--white);
    cursor: pointer;
    border-radius: 5px;
    transition: all 0.3s;
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: var(--white);
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.case-item {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
}

.case-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s;
    color: var(--white);
    text-align: center;
    padding: 20px;
}

.case-item:hover .case-overlay {
    opacity: 1;
}

.case-link {
    color: var(--white);
    text-decoration: none;
    border: 2px solid var(--white);
    padding: 8px 20px;
    margin-top: 15px;
    border-radius: 5px;
    transition: all 0.3s;
}

.case-link:hover {
    background: var(--white);
    color: var(--primary-color);
}

/* 联系我们样式 */
.contact {
    padding: 80px 0;
    background: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
}

.contact-item i {
    font-size: 24px;
    color: var(--primary-color);
    margin-right: 15px;
}

.contact-form {
    background: var(--light-gray);
    padding: 30px;
    border-radius: 10px;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

.form-group textarea {
    height: 150px;
    resize: none;
}

/* 页脚样式 */
footer {
    background: #333;
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo h2 {
    color: var(--white);
    margin-bottom: 15px;
}

.footer-links ul,
.footer-services ul {
    list-style: none;
}

.footer-links ul li,
.footer-services ul li {
    margin-bottom: 10px;
}

.footer-links ul li a,
.footer-services ul li a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links ul li a:hover,
.footer-services ul li a:hover {
    color: var(--primary-color);
}

.social-links {
    margin-top: 20px;
}

.social-links a {
    color: var(--white);
    font-size: 20px;
    margin-right: 15px;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--primary-color);
}

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

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    line-height: 40px;
    border-radius: 50%;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

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

/* 响应式设计 */
@media (max-width: 1024px) {
    .service-grid,
    .company-values {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 20px 0;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }

    nav ul.show {
        display: flex;
    }

    nav ul li {
        margin: 10px 0;
    }

    .about-content,
    .contact-content,
    .contact-info,
    .footer-content {
        grid-template-columns: 1fr;
    }

    .product-slider,
    .case-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-content h1 {
        font-size: 36px;
    }
}

@media (max-width: 480px) {
    .service-grid,
    .company-values,
    .product-slider,
    .case-grid {
        grid-template-columns: 1fr;
    }

    .hero-content h1 {
        font-size: 28px;
    }

    .section-header h2 {
        font-size: 28px;
    }
}