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

/* 全局变量 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-text: #777;
    --background-color: #f5f5f5;
    --white: #fff;
    --border-radius: 8px;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* 基础样式 */
body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    overflow-x: hidden;
}

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

/* 标题样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--light-text);
    text-align: center;
    margin-bottom: 3rem;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

.btn-secondary:hover {
    background-color: var(--secondary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* 导航栏样式 */
.header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo i {
    color: var(--secondary-color);
    margin-right: 0.5rem;
    font-size: 1.8rem;
}

.nav {
    display: flex;
}

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

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--secondary-color);
}

.phone {
    display: flex;
    align-items: center;
    color: var(--accent-color);
    font-weight: 600;
}

.phone i {
    margin-right: 0.5rem;
    font-size: 1.2rem;
}

.menu-btn, .close-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

/* 移动端菜单 */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background-color: var(--white);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    z-index: 1001;
    padding: 2rem;
}

.mobile-menu.active {
    right: 0;
}

.close-btn {
    display: block;
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.mobile-nav-list {
    list-style: none;
    margin-top: 3rem;
}

.mobile-nav-link {
    display: block;
    padding: 1rem 0;
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    border-bottom: 1px solid #eee;
    transition: var(--transition);
}

.mobile-nav-link:hover {
    color: var(--secondary-color);
    padding-left: 0.5rem;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 8rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="rgba(255,255,255,0.05)"/><path d="M0 50 L100 50" stroke="rgba(255,255,255,0.1)" stroke-width="1"/><path d="M50 0 L50 100" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></svg>');
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-title span {
    color: #f39c12;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* 服务项目 */
.services {
    padding: 6rem 0;
    background-color: var(--white);
}

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

.service-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    background-color: #f0f8ff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--secondary-color);
}

.service-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.service-description {
    color: var(--light-text);
    line-height: 1.6;
}

/* 核心优势 */
.advantages {
    padding: 6rem 0;
    background-color: var(--background-color);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.advantage-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.advantage-number {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 3rem;
    font-weight: 700;
    color: rgba(52, 152, 219, 0.1);
}

.advantage-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.advantage-description {
    color: var(--light-text);
    line-height: 1.6;
}

/* 货物追踪 */
.tracking {
    padding: 6rem 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.tracking-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.tracking-form {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.tracking-input {
    flex: 1;
    min-width: 300px;
    padding: 12px 20px;
    font-size: 1rem;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    outline: none;
    transition: var(--transition);
}

.tracking-input:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

/* 客户评价 */
.testimonials {
    padding: 6rem 0;
    background-color: var(--white);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.testimonial-rating {
    color: #f39c12;
    margin-bottom: 1rem;
}

.testimonial-text {
    color: var(--light-text);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.author-info h4 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.author-info p {
    color: var(--light-text);
    font-size: 0.9rem;
}

/* 联系我们 */
.contact {
    padding: 6rem 0;
    background-color: var(--background-color);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-item i {
    width: 40px;
    height: 40px;
    background-color: var(--secondary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.contact-item h3 {
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.contact-item p {
    color: var(--light-text);
}

.contact-form {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚 */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-about p {
    margin-top: 1rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.footer-social {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: var(--transition);
    text-decoration: none;
}

.social-link:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

.footer-links h3,
.footer-services h3,
.footer-contact h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--white);
}

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

.footer-links li,
.footer-services li,
.footer-contact li {
    margin-bottom: 0.75rem;
}

.footer-links a,
.footer-services a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover,
.footer-services a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: rgba(255, 255, 255, 0.8);
}

.footer-contact i {
    color: var(--secondary-color);
    margin-top: 0.25rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

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

.back-to-top:hover {
    background-color: #2980b9;
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .nav {
        display: none;
    }
    
    .menu-btn {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }
    
    .hero {
        padding: 6rem 0 4rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .services,
    .advantages,
    .tracking,
    .testimonials,
    .contact {
        padding: 4rem 0;
    }
    
    .services-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .tracking-input {
        min-width: 100%;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .phone {
        display: none;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
}