/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

/* 全局容器设置 */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: transform 0.3s ease;
}

.nav-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo img {
    height: 50px;
    width: auto;
    transition: transform 0.3s ease;
}

.nav-logo img:hover {
    transform: scale(1.05);
}

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

.nav-link {
    text-decoration: none;
    color: white;
    font-weight: 500;
    font-size: 16px;
    padding: 10px 15px;
    border-radius: 25px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #ff6b6b, #4ecdc4);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 80%;
}

.nav-link:hover,
.nav-link.active {
    color: #ffd700;
    transform: translateY(-2px);
}

.hamburger-menu {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    padding: 5px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.hamburger-menu:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* 主内容区域 */
main {
    padding-top: 70px;
}

section {
    padding: 60px 0;
    position: relative;
}

section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

/* 标题样式 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 40px;
    font-weight: 300;
}

/* 轮播图样式 */
.slider-container,
.about-slider-container {
    position: relative;
    margin: 30px 0;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border: 3px solid rgba(102, 126, 234, 0.3);
}

.slider,
.about-slider {
    position: relative;
    height: 400px;
    overflow: hidden;
}

.slide,
.about-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.slide.active,
.about-slide.active {
    opacity: 1;
}

.slide img,
.about-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.slide img:hover,
.about-slide img:hover {
    transform: scale(1.05);
}

/* 轮播控制按钮 */
.slider-controls,
.about-controls {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    transform: translateY(-50%);
    padding: 0 20px;
}

.prev-btn,
.next-btn,
.about-prev-btn,
.about-next-btn {
    background: rgba(255, 255, 255, 0.8);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.prev-btn:hover,
.next-btn:hover,
.about-prev-btn:hover,
.about-next-btn:hover {
    background: rgba(255, 255, 255, 1);
    transform: scale(1.1);
}

/* 轮播指示点 */
.slider-dots,
.about-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.dot,
.about-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active,
.about-dot.active {
    background: rgba(255, 255, 255, 1);
    transform: scale(1.2);
}

/* 视频展示区 */
.video-container {
    margin: 30px 0;
}

.video-wrapper {
    position: relative;
    height: 400px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border: 3px solid rgba(102, 126, 234, 0.3);
    cursor: pointer;
}

.video-player {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    color: #667eea;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.video-play-btn:hover {
    background: rgba(255, 255, 255, 1);
    transform: translate(-50%, -50%) scale(1.1);
}

/* 产品展示区 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.product-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border: 2px solid rgba(102, 126, 234, 0.2);
    cursor: pointer;
    transition: all 0.3s ease;
}

.product-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.25);
    border-color: rgba(102, 126, 234, 0.5);
}

.product-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.product-item:hover .product-image {
    transform: scale(1.05);
}

/* 关于我们内容 */
.about-content {
    margin-top: 40px;
    padding: 30px;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.about-content h3 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.about-content p {
    margin-bottom: 15px;
    line-height: 1.8;
    color: #555;
}

/* 联系我们 */
.contact-image {
    margin: 30px 0;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    border: 3px solid rgba(102, 126, 234, 0.3);
}

.contact-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 页脚样式 */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer .container {
    max-width: 720px;
}

.footer p {
    margin-bottom: 10px;
    font-size: 14px;
}

.footer p:last-child {
    margin-bottom: 0;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    font-size: 20px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    overflow: auto;
}

.modal-content {
    display: block;
    margin: auto;
    max-width: 90%;
    max-height: 90%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 10px;
    box-shadow: 0 0 50px rgba(255, 255, 255, 0.2);
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.close-modal:hover {
    color: #bbb;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .nav-menu {
        display: flex;
        gap: 15px;
    }
    
    .nav-link {
        font-size: 14px;
        padding: 8px 12px;
    }
    
    .hamburger-menu {
        display: none;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .slider,
    .about-slider,
    .video-wrapper {
        height: 300px;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 15px;
    }
    
    .product-image {
        height: 200px;
    }
    
    .prev-btn,
    .next-btn,
    .about-prev-btn,
    .about-next-btn {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .video-play-btn {
        width: 60px;
        height: 60px;
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 1.8rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .slider,
    .about-slider,
    .video-wrapper {
        height: 250px;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .product-image {
        height: 180px;
    }
    
    .about-content {
        padding: 20px;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
}

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

section {
    animation: fadeIn 0.6s ease-out;
}

/* 加载优化 */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img.loaded {
    opacity: 1;
}

/* 键盘导航支持 */
.keyboard-navigation .nav-link:focus,
.keyboard-navigation button:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* 触摸设备优化 */
.touch-device .nav-link:hover::before {
    width: 0;
}

.touch-device .nav-link:active::before {
    width: 80%;
}

/* 性能优化 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .slider-controls,
    .about-controls,
    .video-play-btn,
    .back-to-top {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .container {
        max-width: 100% !important;
    }
}