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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #0a2463 0%, #1e3c72 100%);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

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

.logo {
    color: white;
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #0a2463;
}

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

.nav-item {
    position: relative;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 4px;
    transition: all 0.3s ease;
    display: block;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.nav-link.active {
    background: rgba(255, 255, 255, 0.2);
}

/* 下拉菜单 */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    padding: 12px 16px;
    color: #333;
    text-decoration: none;
    display: block;
    transition: background 0.3s ease;
}

.dropdown-item:hover {
    background: #f5f5f5;
}

/* 联系按钮 */
.contact-btn {
    background: #ff6b35;
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.contact-btn:hover {
    background: #e55a28;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 107, 53, 0.3);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* 英雄区域 */
.hero-section {
    position: relative;
    background: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.6)), url('https://www.fuberpropulsion.cn/zty/G4.0_8.0/images/banner.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 120px 20px;
    text-align: center;
}

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

.hero-title {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero-description {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.8;
}

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

.btn {
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: #ff6b35;
    color: white;
}

.btn-primary:hover {
    background: #e55a28;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 107, 53, 0.3);
}

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

.btn-secondary:hover {
    background: white;
    color: #0a2463;
    transform: translateY(-2px);
}

/* 产品特点 */
.features-section {
    padding: 80px 20px;
    background: #f8f9fa;
}

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

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 60px;
    color: #0a2463;
}

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

.feature-card {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: #0a2463;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #0a2463;
}

.feature-description {
    color: #666;
    line-height: 1.6;
}

/* 技术参数 */
.specs-section {
    padding: 80px 20px;
    background: white;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    margin: 40px 0;
}

.specs-table th,
.specs-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.specs-table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #0a2463;
}

.specs-table tr:hover {
    background: #f8f9fa;
}

/* 产品展示 */
.product-showcase {
    padding: 80px 20px;
    background: #f8f9fa;
}

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

.showcase-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.showcase-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.showcase-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.showcase-content {
    padding: 20px;
}

.showcase-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 10px;
    color: #0a2463;
}

.showcase-description {
    color: #666;
    line-height: 1.6;
}

/* 操控系统部件 */
.controls-section {
    padding: 80px 20px;
    background: white;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.control-item {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.control-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.control-image {
    width: 150px;
    height: 150px;
    margin: 0 auto 15px;
    object-fit: contain;
}

.control-title {
    font-size: 16px;
    font-weight: 600;
    color: #0a2463;
}

/* 配置方案 */
.configuration-section {
    padding: 80px 20px;
    background: #f8f9fa;
}

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

.config-card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.config-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.config-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #0a2463;
}

.config-image {
    width: 100%;
    height: 500px;
    object-fit: contain;
    margin-bottom: 20px;
}

.config-list {
    list-style: none;
    margin-bottom: 20px;
}

.config-list li {
    padding: 8px 0;
    border-bottom: 1px solid #e0e0e0;
    color: #666;
}

/* 联系表单 */
.contact-form-section {
    padding: 80px 20px;
    background: white;
}

.form-container {
    max-width: 800px;
    margin: 0 auto;
    background: #f8f9fa;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #0a2463;
}

.form-input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: #0a2463;
    box-shadow: 0 0 0 2px rgba(10, 36, 99, 0.2);
}

.form-textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    resize: vertical;
    min-height: 150px;
    transition: all 0.3s ease;
}

.form-textarea:focus {
    outline: none;
    border-color: #0a2463;
    box-shadow: 0 0 0 2px rgba(10, 36, 99, 0.2);
}

.form-submit {
    background: #ff6b35;
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.form-submit:hover {
    background: #e55a28;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 107, 53, 0.3);
}

.form-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 5px;
    text-align: center;
    display: none;
}

.form-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.form-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

/* 页脚 */
.footer {
    background: #0a2463;
    color: white;
    padding: 60px 20px 20px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-section h3 {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 20px;
}

.footer-section p,
.footer-section li {
    margin-bottom: 10px;
    opacity: 0.8;
}

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

.footer-section a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.footer-section a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.6;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .nav-menu {
        gap: 20px;
    }
    
    .nav-link {
        font-size: 15px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .section-title {
        font-size: 30px;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: #0a2463;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        transition: all 0.3s ease;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-link {
        font-size: 18px;
        padding: 15px 20px;
    }
    
    .dropdown-menu {
        position: static;
        background: rgba(255, 255, 255, 0.1);
        box-shadow: none;
        min-width: 100%;
        margin-top: 10px;
    }
    
    .dropdown-item {
        color: white;
        text-align: center;
    }
    
    .dropdown-item:hover {
        background: rgba(255, 255, 255, 0.2);
    }
    
    .contact-btn {
        margin-top: 20px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 200px;
        text-align: center;
    }
    
    .section-title {
        font-size: 24px;
    }
}

/* 滚动效果 */
.navbar.scrolled {
    background: rgba(10, 36, 99, 0.95);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.15);
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}