/* 基础样式 */
:root {
    --primary: #1a73e8;
    --primary-dark: #0d62d9;
    --secondary: #10b981;
    --accent: #8b5cf6;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --white: #ffffff;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background-color: var(--white);
}

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

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(26, 115, 232, 0.2);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.btn-lg {
    padding: 16px 32px;
    font-size: 18px;
}

.text-center {
    text-align: center;
}

/* 语言栏 */
.language-bar {
    background-color: var(--dark);
    color: var(--gray-light);
    padding: 10px 0;
    font-size: 14px;
}

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

.language-selector {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-btn {
    color: var(--gray-light);
    text-decoration: none;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition);
}

.lang-btn:hover,
.lang-btn.active {
    color: var(--white);
    background-color: var(--primary);
}

.contact-info span {
    margin-left: 20px;
}

.contact-info i {
    margin-right: 5px;
}

/* 导航栏 */
.header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--dark);
    font-size: 24px;
    font-weight: 700;
}

.logo i {
    color: var(--primary);
    font-size: 28px;
    margin-right: 10px;
}

.brand-name {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 0;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary);
    border-radius: 2px;
}

.dropdown {
    position: relative;
}

.dropdown-content {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    min-width: 200px;
    box-shadow: var(--shadow);
    border-radius: 8px;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 100;
}

.dropdown:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
}

.dropdown-content a {
    display: block;
    padding: 10px 20px;
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
}

.dropdown-content a:hover {
    background-color: var(--gray-light);
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark);
    cursor: pointer;
}

/* 英雄区域 */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #f0f7ff 0%, #e6f0ff 100%);
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--dark);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.hero-image {
    flex: 1;
}

.image-placeholder {
    background: linear-gradient(135deg, var(--gray-light) 0%, #d1d5db 100%);
    border-radius: 20px;
    height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--gray);
    font-size: 1.2rem;
}

.image-placeholder i {
    font-size: 120px;
    margin-bottom: 20px;
    color: var(--primary);
    opacity: 0.5;
}

/* 特色区域 */
.features {
    padding: 80px 0;
    background-color: var(--white);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 15px;
    color: var(--dark);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray);
    text-align: center;
    margin-bottom: 50px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.feature-icon i {
    font-size: 30px;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
    line-height: 1.6;
}

/* 产品区域 */
.products {
    padding: 80px 0;
    background-color: var(--light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.product-card {
    background-color: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.product-image {
    height: 200px;
    position: relative;
}

.product-image .image-placeholder {
    height: 100%;
    border-radius: 0;
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--secondary);
    color: var(--white);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--dark);
}

.product-info p {
    color: var(--gray);
    margin-bottom: 15px;
    line-height: 1.6;
}

.product-specs {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    color: var(--gray);
    font-size: 14px;
}

.product-specs i {
    margin-right: 5px;
    color: var(--primary);
}

.product-price {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 15px;
}

.product-price .price {
    font-size: 1rem;
    color: var(--gray);
    margin-right: 5px;
}

/* 客户区域 */
.clients {
    padding: 80px 0;
    background-color: var(--white);
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.client-item {
    background-color: var(--light);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.client-item:hover {
    background-color: var(--primary);
    color: var(--white);
    transform: translateY(-5px);
}

.client-item i {
    font-size: 40px;
    margin-bottom: 15px;
    display: block;
}

.client-item span {
    font-weight: 600;
    font-size: 1.1rem;
}

/* 页脚 */
.footer {
    background-color: var(--dark);
    color: var(--gray-light);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--white);
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-logo i {
    color: var(--primary);
    font-size: 28px;
    margin-right: 10px;
}

.footer-col p {
    margin-bottom: 20px;
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--gray-light);
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
}

.footer-col h3 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 20px;
}

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

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

.footer-col ul a {
    color: var(--gray-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--primary);
}

.contact-info li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
}

.contact-info i {
    color: var(--primary);
    margin-right: 10px;
    margin-top: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--gray-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .image-placeholder {
        height: 300px;
    }
}

@media (max-width: 768px) {
    .language-bar .container {
        flex-direction: column;
        gap: 10px;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-lg {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .features-grid,
    .products-grid,
    .clients-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card,
    .product-card,
    .client-item {
        margin-bottom: 20px;
    }
}