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

body {
    font-family: 'Arial', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* 导航栏样式 */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo h2 {
    color: #2563eb;
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 10px;
}

.nav-menu li a {
    text-decoration: none;
    color: #333;
    padding: 10px 20px;
    transition: color 0.3s;
    font-weight: 500;
    border-radius: 5px;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    color: #2563eb;
    background: #f1f5f9;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 150px 0 100px;
    text-align: center;
    margin-top: 70px; /* 为固定导航栏留出空间 */
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    background: #fff;
    color: #667eea;
    padding: 15px 35px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    font-size: 1.1rem;
}

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

/* 特性区域 */
.features {
    padding: 80px 0;
    background: #f8fafc;
}

.features h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5rem;
    color: #1e293b;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    border: 1px solid #f1f5f9;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 25px;
    display: block;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: #2563eb;
    font-size: 1.4rem;
}

.feature-card p {
    color: #64748b;
    line-height: 1.7;
}

/* 页面头部 */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 140px 0 60px;
    text-align: center;
    margin-top: 70px;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 关于我们内容 */
.about-content {
    padding: 80px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text h2 {
    color: #2563eb;
    margin-bottom: 25px;
    font-size: 2rem;
}

.about-text h3 {
    color: #374151;
    margin: 35px 0 18px;
    font-size: 1.3rem;
}

.about-text p {
    color: #4b5563;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 25px;
    position: sticky;
    top: 100px;
}

.stat-item {
    text-align: center;
    padding: 35px 25px;
    background: #f8fafc;
    border-radius: 15px;
    border-left: 4px solid #2563eb;
    transition: transform 0.3s ease;
}

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

.stat-item h4 {
    font-size: 2.8rem;
    color: #2563eb;
    margin-bottom: 10px;
    font-weight: 700;
}

.stat-item p {
    color: #64748b;
    font-size: 1.1rem;
    font-weight: 500;
}

/* 产品服务 */
.products-content {
    padding: 80px 0;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 35px;
}

.product-card {
    background: white;
    padding: 45px 35px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    border-left: 5px solid #2563eb;
    transition: all 0.3s ease;
    border: 1px solid #f1f5f9;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
    border-left-color: #1d4ed8;
}

.product-card h3 {
    color: #2563eb;
    margin-bottom: 20px;
    font-size: 1.5rem;
    font-weight: 600;
}

.product-card > p {
    margin-bottom: 25px;
    color: #64748b;
    line-height: 1.7;
    font-size: 1.05rem;
}

.product-card ul {
    list-style: none;
}

.product-card li {
    padding: 8px 0;
    position: relative;
    padding-left: 28px;
    color: #475569;
    line-height: 1.6;
}

.product-card li:before {
    content: "✓";
    color: #10b981;
    position: absolute;
    left: 0;
    font-weight: bold;
    font-size: 1.1rem;
}

/* 联系表单样式 */
.contact-content {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    padding: 30px;
}

.contact-info h3 {
    color: #2563eb;
    margin-bottom: 25px;
    font-size: 1.5rem;
}

.contact-details {
    margin-bottom: 40px;
}

.contact-detail {
    display: flex;
    align-items: flex-start;
    margin-bottom: 25px;
    padding: 15px;
    border-radius: 10px;
    transition: background-color 0.3s;
}

.contact-detail:hover {
    background: #f8fafc;
}

.contact-detail i {
    font-size: 1.2rem;
    color: #2563eb;
    margin-right: 15px;
    margin-top: 2px;
}

.contact-form {
    background: #f8fafc;
    padding: 40px;
    border-radius: 15px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #374151;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #2563eb;
}

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

.submit-btn {
    background: #2563eb;
    color: white;
    padding: 15px 35px;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.submit-btn:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
}

/* 底部样式 */
.footer {
    background: #1f2937;
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 50px;
    margin-bottom: 40px;
}

.footer-section h3 {
    margin-bottom: 20px;
    color: #60a5fa;
    font-size: 1.4rem;
}

.footer-section h4 {
    margin-bottom: 20px;
    color: #60a5fa;
    font-size: 1.2rem;
}

.footer-section p {
    margin-bottom: 12px;
    color: #d1d5db;
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        padding: 20px 0;
        gap: 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 10px 0;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }

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

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .features-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .feature-card,
    .product-card {
        padding: 30px 25px;
    }

    .page-header {
        padding: 120px 0 50px;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .about-stats {
        position: static;
    }

    .stat-item {
        padding: 25px 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .features h2 {
        font-size: 2rem;
    }
    
    .contact-form {
        padding: 25px;
    }
}