/* 全局样式 */
:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --text-color: #2c3e50;
    --light-bg: #f8f9fa;
    --white: #ffffff;
}

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

body {
    font-family: "Microsoft YaHei", sans-serif;
    line-height: 1.8;
    color: var(--text-color);
    overflow-x: hidden;
    padding-bottom: 4rem;
}

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

/* 导航栏样式 */
.navbar {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links a:hover {
    color: var(--accent-color);
}

/* 首页横幅样式 */
.hero {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--white);
    padding-top: 80px;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(to top, rgba(255,255,255,1), transparent);
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    animation: fadeInDown 1s ease;
}

.hero p {
    font-size: 1.4rem;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
    animation: fadeInUp 1s ease 0.5s;
    animation-fill-mode: both;
}

/* 各个部分的通用样式 */
section {
    padding: 8rem 0;
    position: relative;
}

section h2 {
    text-align: center;
    margin-bottom: 4rem;
    font-size: 2.8rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 1rem;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: var(--accent-color);
}

/* 关于我们样式 */
.about {
    background-color: var(--light-bg);
}

.about p {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.2rem;
    line-height: 1.8;
    color: #666;
}

/* 产品服务样式 */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.service-item {
    background: var(--white);
    padding: 3rem 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    text-align: center;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.service-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--accent-color);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.service-item:hover::before {
    transform: scaleX(1);
}

.service-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.12);
}

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

.service-item p {
    color: #666;
    font-size: 1.1rem;
    line-height: 1.6;
}

/* 联系我们样式 */
.contact {
    background-color: var(--light-bg);
    position: relative;
}

.contact-info {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem;
    background: var(--white);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.contact-info p {
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    color: #666;
}

/* 页脚样式 */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 1rem 0;
    position: fixed;
    bottom: 0;
    width: 100%;
    z-index: 1000;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    font-size: 1rem;
    opacity: 0.9;
}

.footer-content span,
.footer-content a {
    color: var(--white);
}

.divider {
    color: var(--white);
    opacity: 0.8;
}

.beian-link {
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.beian-link:hover {
    opacity: 0.8;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .divider {
        display: none;
    }
}

/* 动画关键帧 */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    section h2 {
        font-size: 2.2rem;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }
    
    section {
        padding: 5rem 0;
    }
}