/* 基础样式重置 */
* {
    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: #333;
    background-color: #f8f9fa;
}

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

/* 顶部信息栏 */
.top-bar {
    background-color: #1a1a1a;
    color: #fff;
    padding: 8px 0;
    font-size: 14px;
}

.contact-info {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 20px;
}

/* 头部区域 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.header.scroll-down {
    transform: translateY(-100%);
}

.header.scroll-up {
    transform: translateY(0);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: #1a1a1a;
}

/* 导航菜单 */
.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #007bff;
    transition: width 0.3s ease;
}

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

/* 移动端菜单按钮 */
.mobile-menu {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: #333;
    transition: all 0.3s ease;
}

/* 移动端导航 */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background-color: #fff;
    padding: 80px 20px 20px;
    transition: right 0.3s ease;
    z-index: 1001;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
}

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

.mobile-nav-list {
    list-style: none;
}

.mobile-nav-link {
    display: block;
    padding: 15px 0;
    color: #333;
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid #eee;
}

/* 遮罩层 */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 英雄区域 */
.hero {
    padding: 100px 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #2c3e50 100%);
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-text {
    color: #fff;
    z-index: 2;
}

.hero-text h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
    background: linear-gradient(135deg, #fff 0%, #e0e0e0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    font-size: 18px;
    margin-bottom: 30px;
    color: #e0e0e0;
    line-height: 1.6;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease;
}

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

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: #007bff;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: #e0e0e0;
}

.hero-image {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.3s ease;
}

.hero-image:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.hero-image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.6));
    display: flex;
    align-items: flex-end;
    padding: 30px;
}

.overlay-content {
    color: #fff;
}

.overlay-content h3 {
    font-size: 24px;
    margin-bottom: 10px;
    font-weight: 600;
}

.overlay-content p {
    font-size: 16px;
    opacity: 0.9;
}

/* 服务特点 */
.features {
    padding: 80px 0;
    background-color: #fff;
}

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

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 15px;
}

.section-header p {
    color: #666;
    font-size: 18px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

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

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.feature-card p {
    color: #666;
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 8px 0;
    color: #666;
    position: relative;
    padding-left: 20px;
}

.feature-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #007bff;
}

/* 服务优势 */
.advantages {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.advantage-item {
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    display: flex;
    gap: 20px;
}

.advantage-icon {
    font-size: 24px;
    color: #007bff;
    flex-shrink: 0;
}

.advantage-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.advantage-content p {
    color: #666;
    margin-bottom: 20px;
}

.advantage-features {
    list-style: none;
}

.advantage-features li {
    padding: 8px 0;
    color: #666;
    position: relative;
    padding-left: 20px;
}

.advantage-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #007bff;
}

/* 服务流程 */
.process {
    padding: 80px 0;
    background-color: #fff;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.process-step {
    text-align: center;
    padding: 30px;
    background-color: #f8f9fa;
    border-radius: 10px;
    position: relative;
}

.step-number {
    font-size: 48px;
    font-weight: 700;
    color: #007bff;
    opacity: 0.2;
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
}

.process-step h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 20px 0 10px;
    color: #1a1a1a;
    position: relative;
}

.process-step p {
    color: #666;
}

/* 页脚 */
.footer {
    background-color: #1a1a1a;
    color: #fff;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-info h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-info p {
    color: #999;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

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

.footer-links a {
    color: #999;
    text-decoration: none;
    display: block;
    padding: 8px 0;
    transition: color 0.3s ease;
}

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

.footer-contact p {
    color: #999;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: #999;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .nav {
        display: none;
    }
    
    .mobile-menu {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-text {
        text-align: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .process-steps {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links ul {
        display: flex;
        justify-content: center;
        gap: 20px;
    }
}

@media (max-width: 576px) {
    .hero-text h2 {
        font-size: 36px;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .footer-links ul {
        flex-direction: column;
        gap: 10px;
    }
}

/* 打印样式 */
@media print {
    .header,
    .mobile-menu,
    .mobile-nav,
    .overlay,
    .footer {
        display: none;
    }
    
    body {
        background-color: #fff;
    }
    
    .container {
        max-width: none;
        padding: 0;
    }
}

/* 成功案例样式 */
.cases {
    padding: 80px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.case-card {
    background: #fff;
    border-radius: 15px;
    padding: 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.case-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.case-header {
    padding: 25px 25px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #f0f0f0;
}

.case-icon {
    font-size: 32px;
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.case-badge {
    background: #e3f2fd;
    color: #007bff;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.case-content {
    padding: 20px 25px;
    flex-grow: 1;
}

.case-card h3 {
    font-size: 20px;
    color: #2c3e50;
    margin-bottom: 15px;
    font-weight: 600;
}

.case-desc {
    color: #6c757d;
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.case-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
}

.stat {
    text-align: center;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
}

.stat-value {
    display: block;
    font-size: 18px;
    font-weight: 600;
    color: #007bff;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 13px;
    color: #6c757d;
}

.case-footer {
    padding: 15px 25px;
    background: #f8f9fa;
    border-top: 1px solid #f0f0f0;
    display: flex;
    gap: 10px;
}

.case-tag {
    background: #e9ecef;
    color: #495057;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 13px;
    font-weight: 500;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .cases {
        padding: 60px 0;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .case-header {
        padding: 20px 20px 15px;
    }
    
    .case-content {
        padding: 15px 20px;
    }
    
    .case-footer {
        padding: 12px 20px;
    }
}