/* 全局样式 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
}

body {
    font-family: "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #fff;
}

/* 导航栏样式 */
.navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 2rem;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: 500;
    margin: 0 0.5rem;
    position: relative;
    transition: color 0.3s;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

.nav-link::after {
    content: "";
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

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

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 5rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.btn-primary {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    padding: 0.75rem 2rem;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary:hover {
    background-color: #c0392b;
    border-color: #c0392b;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* 特性部分 */
.features {
    padding: 5rem 0;
}

.feature-box {
    text-align: center;
    padding: 2rem;
    border-radius: 8px;
    transition: transform 0.3s, box-shadow 0.3s;
    height: 100%;
}

.feature-box:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

/* 关于我们部分 */
.about-section {
    background-color: var(--light-color);
    padding: 5rem 0;
}

/* 服务部分 */
.services-section {
    padding: 5rem 0;
}

.service-card {
    border: none;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    height: 100%;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.service-card .card-img-top {
    height: 200px;
    object-fit: cover;
}

/* 联系我们部分 */
.contact-section {
    background-color: var(--light-color);
    padding: 5rem 0;
}

.contact-form {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.contact-info {
    padding: 2rem;
}

.contact-item {
    margin-bottom: 1.5rem;
}

.contact-icon {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-right: 1rem;
}

/* 页脚 */
.footer {
    background-color: var(--dark-color);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-heading {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
    transition: color 0.3s;
}

.footer-link:hover {
    color: white;
}

.social-icons {
    margin-top: 1.5rem;
}

.social-icon {
    color: white;
    font-size: 1.5rem;
    margin-right: 1rem;
    transition: color 0.3s;
}

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

.copyright {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

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

    .feature-box {
        margin-bottom: 2rem;
    }
}

/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s, transform 0.5s;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}