/* 全局重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

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

ul {
    list-style: none;
}

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

.btn {
    display: inline-block;
    padding: 10px 30px;
    background-color: #007bff;
    color: #fff;
    border-radius: 5px;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn:hover {
    background-color: #0056b3;
}

.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 10px;
}

.section-title p {
    color: #7f8c8d;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.bg-light {
    background-color: #ffffff;
}

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

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo h1 {
    font-size: 1.5rem;
    color: #007bff;
    display: inline-block;
}

.logo span {
    font-size: 0.9rem;
    color: #666;
    margin-left: 5px;
}

.nav ul {
    display: flex;
}

.nav ul li {
    margin-left: 30px;
}

.nav ul li a {
    font-weight: 500;
    color: #333;
    transition: color 0.3s;
}

.nav ul li a:hover {
    color: #007bff;
}

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

/* 首页焦点图 */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('https://images.unsplash.com/photo-1519389950473-47ba0277781c?ixlib=rb-1.2.1&auto=format&fit=crop&w=1950&q=80');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    padding-top: 70px; /* 导航栏高度补偿 */
}

.hero-content h2 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    animation: fadeInUp 1s ease;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1s ease 0.2s;
    animation-fill-mode: both;
}

.hero-content .btn {
    animation: fadeInUp 1s ease 0.4s;
    animation-fill-mode: both;
}

/* 关于我们 */
.about-text p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: #555;
    text-align: center;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

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

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

.feature-item i {
    font-size: 2.5rem;
    color: #007bff;
    margin-bottom: 15px;
    display: block;
}

.feature-item span {
    font-weight: bold;
    color: #333;
}

/* 产品与服务 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.product-card {
    background: #f9f9f9;
    padding: 30px;
    border-radius: 8px;
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
    border: 1px solid #eee;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    background: #fff;
}

.icon-box {
    width: 60px;
    height: 60px;
    background: #e7f1ff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.icon-box i {
    font-size: 1.5rem;
    color: #007bff;
}

.product-card h3 {
    margin-bottom: 15px;
    color: #333;
}

.product-card p {
    color: #666;
    font-size: 0.95rem;
}

/* 联系我们 */
.contact-container {
    display: flex;
    flex-wrap: wrap;
    gap: 50px;
    justify-content: center;
}

.contact-info {
    flex: 1;
    min-width: 300px;
    max-width: 500px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
}

.info-item i {
    font-size: 1.5rem;
    color: #007bff;
    margin-right: 20px;
    margin-top: 5px;
}

.info-item h4 {
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.contact-form {
    flex: 1;
    min-width: 300px;
    max-width: 500px;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.contact-form .btn {
    width: 100%;
}

/* 页脚 */
.footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
    font-size: 0.9rem;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式适配 */
@media (max-width: 768px) {
    .hero-content h2 {
        font-size: 2.5rem;
    }
    
    .nav {
        display: none; /* 移动端暂简略处理 */
    }
    
    .menu-toggle {
        display: block;
    }
    
    .contact-container {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-info, .contact-form {
        width: 100%;
    }
}