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

/* 字体导入 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
    scroll-behavior: smooth;
}

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

/* 导航栏样式 */
header {
    background-color: rgba(255, 255, 255, 0.95);
    color: #333;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin: 0;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    color: #555;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 8px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #3498db;
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: #3498db;
}

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

.language-switcher {
    display: flex;
    gap: 10px;
}

.language-switcher button {
    background-color: transparent;
    color: #333;
    border: 2px solid #e0e0e0;
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    outline: none;
}

.language-switcher button:hover {
    background-color: #3498db;
    border-color: #3498db;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

/* 首页横幅样式 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    margin-top: 70px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></svg>');
    background-size: 50px 50px;
}

.hero-content {
    max-width: 800px;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.hero h2 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    font-weight: 700;
    animation: fadeInUp 1s ease;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2.5rem;
    font-weight: 300;
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.2s both;
}

.cta-btn {
    display: inline-block;
    background-color: white;
    color: #3498db;
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    animation: fadeInUp 1s ease 0.4s both;
    border: 2px solid white;
}

.cta-btn:hover {
    background-color: transparent;
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 各区块通用样式 */
section {
    padding: 100px 0;
    position: relative;
}

section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
}

section h2 {
    text-align: center;
    font-size: 2.8rem;
    margin-bottom: 50px;
    color: #2c3e50;
    font-weight: 700;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

/* 关于我们样式 */
.about {
    background-color: white;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
    max-width: 1000px;
    margin: 0 auto;
}

.about-text {
    flex: 1;
    min-width: 300px;
}

.about-text p {
    font-size: 1.15rem;
    margin-bottom: 25px;
    color: #555;
    line-height: 1.8;
    text-align: justify;
}

/* 业务范围样式 */
.business {
    background-color: #f8f9fa;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}

.business-item {
    background-color: white;
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 4px solid #3498db;
    position: relative;
    overflow: hidden;
}

.business-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(52, 152, 219, 0.05), transparent);
    transition: left 0.5s ease;
}

.business-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.business-item:hover::before {
    left: 100%;
}

.business-item h3 {
    font-size: 1.6rem;
    margin-bottom: 20px;
    color: #2c3e50;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.business-item h3::before {
    content: '✓';
    color: #3498db;
    font-weight: bold;
    font-size: 1.8rem;
}

.business-item p {
    color: #666;
    line-height: 1.7;
    font-size: 1rem;
}

/* 全球网络样式 */
.network {
    background-color: white;
}

.network-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 50px;
    max-width: 1100px;
    margin: 0 auto;
}

.network-item {
    text-align: center;
    padding: 40px 30px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.network-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.network-item h3 {
    font-size: 2rem;
    margin-bottom: 25px;
    color: #2c3e50;
    font-weight: 700;
}

.network-item p {
    color: #555;
    line-height: 1.8;
    font-size: 1.1rem;
    text-align: justify;
}

/* 联系我们样式 */
.contact {
    background-color: #f8f9fa;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    background-color: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-top: 4px solid #3498db;
}

.contact-info p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: #555;
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact-info p strong {
    color: #2c3e50;
    font-weight: 600;
    min-width: 80px;
}

.contact-info strong {
    color: #2c3e50;
    font-size: 1.4rem;
    display: block;
    margin-bottom: 30px;
    text-align: center;
    font-weight: 700;
}

.contact-form {
    background-color: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-top: 4px solid #764ba2;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 18px;
    margin-bottom: 25px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s ease;
    outline: none;
    background-color: #fafafa;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: #3498db;
    background-color: white;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.contact-form textarea {
    resize: vertical;
    min-height: 180px;
}

.contact-form button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 18px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.contact-form button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.6);
}

/* 页脚样式 */
footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 50px 0 30px;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
}

.footer-content {
    max-width: 1000px;
    margin: 0 auto;
}

.footer-links {
    margin-bottom: 30px;
}

.footer-links h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: white;
    font-weight: 600;
    opacity: 0.9;
}

.platform-links {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.platform-links a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    opacity: 0.8;
    transition: all 0.3s ease;
    position: relative;
    padding: 5px 0;
}

.platform-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #3498db;
    transition: width 0.3s ease;
}

.platform-links a:hover {
    opacity: 1;
    color: #3498db;
}

.platform-links a:hover::after {
    width: 100%;
}

footer p {
    margin: 0;
    font-size: 1rem;
    opacity: 0.8;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    margin-top: 20px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 20px;
        padding: 15px 20px;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }

    .nav-links li {
        margin: 0;
    }

    .hero h2 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    section {
        padding: 80px 0;
    }

    section h2 {
        font-size: 2.2rem;
    }

    .about-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .about-text p {
        text-align: left;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .business-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .network-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .network-item p {
        text-align: left;
    }
}

@media (max-width: 480px) {
    section {
        padding: 60px 0;
    }

    .hero {
        height: 85vh;
        margin-top: 80px;
    }

    .hero h2 {
        font-size: 2rem;
    }

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

    .cta-btn {
        padding: 12px 30px;
        font-size: 1rem;
    }

    section h2 {
        font-size: 1.8rem;
    }

    .business-item,
    .network-item,
    .contact-info,
    .contact-form {
        padding: 30px 20px;
    }

    .business-grid {
        gap: 20px;
    }

    .network-content {
        gap: 20px;
    }

    .contact-content {
        gap: 20px;
    }
}