/* 基础重置和全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.nav-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.back-to-home-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    gap: 8px;
}

.back-to-home-btn:hover {
    background: white;
    color: #1e3a8a;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    border-color: white;
}

.back-to-home-btn:active {
    transform: translateY(0);
}

.logo h2 {
    font-size: 1.2rem;
    font-weight: 600;
}

.lang-selector {
    display: flex;
    gap: 10px;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.lang-btn.active {
    background: white;
    color: #1e3a8a;
    font-weight: 600;
}

/* 主要内容区域 */
.main-content {
    min-height: calc(100vh - 120px);
}

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.company-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

.cta-buttons {
    margin-top: 2rem;
}

.primary-btn {
    display: inline-block;
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    color: white;
    padding: 15px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

/* 内容区域通用样式 */
.section-title {
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 2rem;
    color: #1e3a8a;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #3b82f6;
    margin: 10px auto;
}

/* 关于我们区域 */
.about-section {
    padding: 4rem 0;
    background: white;
}

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

.about-text {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    text-align: justify;
    line-height: 1.8;
}

.service-concept h3 {
    font-size: 1.5rem;
    color: #1e3a8a;
    margin-bottom: 1rem;
}

.service-concept ul {
    list-style: none;
}

.service-concept li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.service-concept li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: #3b82f6;
    font-size: 0.8rem;
}

.service-concept span {
    font-weight: 600;
    color: #1e3a8a;
}

/* 服务区域 */
.services-section {
    padding: 4rem 0;
    background: #f8f9fa;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.service-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e1e5e9;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.service-card h3 {
    font-size: 1.3rem;
    color: #1e3a8a;
    margin-bottom: 1rem;
    font-weight: 600;
}

.service-desc {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.features-list {
    list-style: none;
}

.features-list li {
    padding: 0.3rem 0;
    padding-left: 1.2rem;
    position: relative;
}

.features-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

/* 联系我们区域 */
.contact-section {
    padding: 4rem 0;
    background: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

.contact-info, .address-info {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    border-left: 4px solid #3b82f6;
}

.contact-info h3, .address-info h3 {
    font-size: 1.3rem;
    color: #1e3a8a;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.contact-item {
    margin-bottom: 1rem;
    padding: 0.5rem 0;
}

.contact-item strong {
    color: #1e3a8a;
    display: inline-block;
    min-width: 80px;
}

/* 页脚 */
.footer {
	position:fixed;
	bottom:0;
	left:0;
	width:100%;
    background: #1e3a8a;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-left {
        order: 1;
        width: 100%;
        justify-content: flex-start;
    }
    
    .back-to-home-btn {
        font-size: 0.9rem;
        padding: 8px 16px;
    }
    
    .company-title {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .about-content {
        padding: 0 1rem;
    }
    
    .services-grid, .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-item strong {
        display: block;
        width: auto;
        margin-bottom: 0.2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-section {
        padding: 2rem 0;
    }
    
    .company-title {
        font-size: 1.5rem;
    }
    
    .lang-selector {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .lang-btn {
        font-size: 0.8rem;
        padding: 6px 12px;
    }
}

/* 语言切换相关的隐藏类 */
.hidden {
    display: none !important;
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.service-card {
    animation: fadeIn 0.6s ease-out;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }

/* 固定跳转按钮 */
.floating-nav-buttons {
    position: fixed !important;
    top: 80%;
    right: 30px;
    z-index: 1000;
}

.floating-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    border: 2px solid transparent;
}

.floating-btn.primary-btn {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    color: white;
}

.floating-btn.secondary-btn {
    background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
    color: white;
}

.floating-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.floating-btn:active {
    transform: translateY(-1px) scale(1.02);
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-text {
    white-space: nowrap;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .floating-nav-buttons {
        bottom: 20px;
        right: 20px;
    }
    
    .floating-btn {
        padding: 10px 16px;
        font-size: 0.8rem;
    }
    
    .btn-text {
        display: none;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #3b82f6;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #1e3a8a;
}