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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #fff;
    background-color: #1a1a1a;
}

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

/* 导航栏样式 */
.header {
    background-color: #000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.logo-img {
    height: 40px;
    width: auto;
}

.logo a {
    text-decoration: none;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    margin-left: 2rem;
    transition: color 0.3s;
    font-size: 1rem;
}

.nav-links a:hover {
    color: #666;
}

.nav-links a.active {
    color: #666;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background-color: #fff;
    margin: 2px 0;
    transition: 0.3s;
}

/* 英雄区域样式 */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('../images/background.png');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    margin-top: 60px;
}

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

/* 业务卡片样式 */
.business-section {
    padding: 4rem 0;
    background-color: #1a1a1a;
}

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

.card {
    background: #2a2a2a;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    text-align: center;
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: #333;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #444;
}

/* 关于我们和联系我们部分 */
.about-section,
.contact-section {
    padding: 4rem 0;
    background-color: #1a1a1a;
}

.contact-info {
    margin-top: 2rem;
}

/* 页脚样式 */
.footer {
    background-color: #111;
    color: #fff;
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-links {
    margin-bottom: 1rem;
}

.footer-links a {
    color: #fff;
    text-decoration: none;
    margin: 0 1rem;
}

.footer-links a:hover {
    color: #666;
}

.footer-info p {
    margin: 0.5rem 0;
    color: #999;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #1a1a1a;
        padding: 1rem;
        box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
    }

    .nav-links a {
        margin: 0.5rem 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

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

    .business-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

    .footer-links {
        display: flex;
        flex-direction: column;
    }

    .footer-links a {
        margin: 0.5rem 0;
    }
}