:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --light-bg: #f8f9fa;
}

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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

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

nav {
    background: var(--primary-color);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
}

.lang-switch {
    padding: 0.5rem 1rem;
    border: none;
    background: var(--secondary-color);
    color: white;
    border-radius: 4px;
    cursor: pointer;
}

header {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 8rem 0 4rem;
}

section {
    padding: 4rem 0;
}

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

.service-card {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
}

#contact {
    background: var(--light-bg);
    text-align: center;
}

.contact-section {
    background: var(--light-bg);
    padding: 4rem 0;
}

.contact-info {
    max-width: 400px;
    margin: 2rem auto;
    text-align: center;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.contact-item {
    margin: 1.5rem 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.contact-item i {
    color: var(--secondary-color);
    font-size: 1.5rem;
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: var(--secondary-color);
}

.contact-social {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #eee;
}

.social-link {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0 1rem;
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--secondary-color);
}

footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1rem 0;
}

@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }
    
    header {
        padding: 6rem 0 3rem;
    }
}

/* 新增样式 */
.cta-buttons {
    margin-top: 2rem;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    margin: 0 1rem;
    transition: all 0.3s ease;
}

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

.secondary-btn {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.achievement-list {
    list-style: none;
    margin-top: 2rem;
}

.achievement-list li {
    margin: 1rem 0;
    padding-left: 2rem;
    position: relative;
}

.achievement-list li:before {
    content: '✓';
    color: var(--secondary-color);
    position: absolute;
    left: 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.advantage-card {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

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

.advantage-card i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--secondary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

@media (max-width: 768px) {
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
    }
}