* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: #333;
    background: #fff;
}

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

/* 顶部导航 */
.header {
    background: #fff;
    border-bottom: 1px solid #f0f0f0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: #333;
}

.logo-img {
    height: 32px;
    width: auto;
    display: block;
    object-fit: contain;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
}

/* 如果没有logo图片，只显示文字 */
.logo-img[style*="display: none"] + .logo-text {
    margin-left: 0;
}

.nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav a {
    color: #666;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav a:hover {
    color: #333;
}

.btn-primary {
    background: #333;
    color: #fff !important;
    padding: 8px 20px;
    border-radius: 4px;
    font-size: 14px;
}

.btn-primary:hover {
    background: #000;
}

/* Hero区域 */
.hero {
    padding: 120px 0;
    text-align: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(0,0,0,0.02) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(0,0,0,0.02) 0%, transparent 50%);
    pointer-events: none;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 24px;
    line-height: 1.1;
    letter-spacing: -0.5px;
}

.hero-desc {
    font-size: 18px;
    color: #666;
    margin-bottom: 48px;
    font-weight: 400;
    line-height: 1.8;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    background: #1a1a1a;
    color: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.btn:hover {
    background: #000;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-large {
    padding: 16px 48px;
    font-size: 17px;
}

.btn-outline {
    background: transparent;
    border: 2px solid #1a1a1a;
    color: #1a1a1a;
    box-shadow: none;
}

.btn-outline:hover {
    background: #1a1a1a;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* 服务区域 */
.services {
    padding: 100px 0;
    background: #fff;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header h2 {
    font-size: 40px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

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

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.service-item {
    background: #fff;
    border: 1px solid #e8e8e8;
    border-radius: 12px;
    padding: 48px 40px;
    text-align: left;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.service-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #1a1a1a 0%, #4a4a4a 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.service-item:hover {
    border-color: #d0d0d0;
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
    transform: translateY(-4px);
}

.service-item:hover::before {
    transform: scaleX(1);
}

.service-item h3 {
    font-size: 24px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 16px;
    line-height: 1.3;
}

.service-item p {
    color: #666;
    margin-bottom: 28px;
    font-size: 15px;
    line-height: 1.8;
}

.service-link {
    display: inline-block;
    color: #1a1a1a;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    padding: 10px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}

.service-link:hover {
    color: #000;
    border-bottom-color: #1a1a1a;
    padding-right: 8px;
}

/* 介绍说明 */
.intro {
    padding: 80px 0;
    background: #fafafa;
}

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

.intro-content h2 {
    font-size: 36px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 32px;
    letter-spacing: -0.5px;
}

.intro-content p {
    font-size: 16px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 20px;
}

.intro-content p:last-child {
    margin-bottom: 0;
}

/* 优势特点 */
.features {
    padding: 100px 0;
    background: #fff;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.feature-item {
    text-align: left;
    padding: 40px 32px;
    background: #fafafa;
    border-radius: 12px;
    transition: all 0.3s;
}

.feature-item:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
}

.feature-item h3 {
    font-size: 22px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 16px;
}

.feature-item p {
    color: #666;
    font-size: 15px;
    line-height: 1.8;
}

/* CTA区域 */
.cta {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.03) 0%, transparent 50%);
    pointer-events: none;
}

.cta h2 {
    font-size: 44px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.cta p {
    font-size: 20px;
    color: #ccc;
    margin-bottom: 48px;
    font-weight: 400;
}

.btn-white {
    background: #fff;
    color: #1a1a1a;
}

.btn-white:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255,255,255,0.2);
}

/* 底部 */
.footer {
    background: #1a1a1a;
    color: #999;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

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

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col a {
    color: #999;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

.footer-col p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 15px;
}

.footer-link {
    color: #fff;
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #2a2a2a;
    font-size: 14px;
    color: #666;
}

/* 响应式 */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero {
        padding: 80px 0;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-desc {
        font-size: 16px;
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .service-item {
        padding: 36px 28px;
    }
    
    .intro-content {
        padding: 0 20px;
    }
    
    .intro-content h2 {
        font-size: 28px;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .feature-item {
        padding: 32px 24px;
    }
    
    .cta h2 {
        font-size: 32px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}