.expertise-section {
    background-color: #2E5B9E !important;
}

.product-hero-bg {
    background-color: #2E5B9E !important;
}


.product-sheet-btn {
    background-color: #2E5B9E !important;
    transition: all 0.3s ease;
}


.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 200px;
    background-color: rgba(0, 0, 0, 0.95);
    border-top: 2px solid #2E5B9E !important;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 20;
}

.dropdown-menu a:hover {
    background-color: rgba(45, 212, 191, 0.1);
    color: #2E5B9E;
}



/* 自定义样式 */

/* 字体设置 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

body {
    font-family: 'Inter', sans-serif;
    scroll-behavior: smooth;
    color: #333;
}


html, body {
    overflow-x: hidden;
    width: 100%;
    position: relative;
}



/* Logo样式 */
.logo-text {
    letter-spacing: -0.5px;
    font-weight: 700;
}

/* 英雄区域背景 */
.hero-bg {
    background-color: #000;
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.9)), url('https://images.unsplash.com/photo-1584949514490-73fc1a2faa97?ixlib=rb-1.2.1&auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

/* 卡片悬停效果 */
.card-hover {
    transition: transform 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-10px);
}

/* 按钮样式 */
.btn-primary {
    background-color: #000;
    color: #fff;
    padding: 12px 24px;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary:hover {
    background-color: #333;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* 视频播放按钮动画 */
.play-btn {
    position: relative;
    transition: all 0.3s ease;
}

.play-btn:hover {
    transform: scale(1.1);
}

.play-btn:before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: rgba(45, 212, 191, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    100% {
        transform: scale(1.5);
        opacity: 0;
    }
}

/* 导航栏样式 */
header {
    transition: all 0.3s ease;
}

header.scrolled {
    background-color: rgba(0, 0, 0, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 图片卡片渐变覆盖 */
.img-overlay {
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0) 60%);
}

/* 专业领域展示区域样式 */
.expertise-section {
    background-color: #2dd4bf;
}

.expertise-title:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50px;
    height: 4px;
    background-color: #fff;
}

.expertise-icon {
    transition: transform 0.3s ease;
}

.expertise-card:hover .expertise-icon {
    transform: translateY(-5px);
}

.expertise-button {
    background-color: #000;
    color: #fff;
    transition: all 0.3s ease;
}

.expertise-button:hover {
    background-color: rgba(0, 0, 0, 0.8);
}

/* 产品展示区域样式 */
.products-title:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50px;
    height: 4px;
    background-color: #2dd4bf;
}

.product-card {
    transition: transform 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
}

.product-card img {
    transition: transform 0.5s ease;
}

.product-card:hover img {
    transform: scale(1.05);
}

.product-card svg {
    transition: transform 0.3s ease;
}

.product-card:hover svg {
    transform: translateX(5px);
}

/* PEM技术展示区域样式 */
.pem-diagram-container {
    position: relative;
    overflow: hidden;
    padding: 20px;
    border-radius: 10px;
    background-color: rgba(0, 0, 0, 0.3);
}

.pem-diagram {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.pem-diagram svg {
    filter: drop-shadow(0px 0px 10px rgba(45, 212, 191, 0.3));
}

.wind-turbine {
    animation: rotate 10s linear infinite;
    transform-origin: 225px 50px;
}

@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.car-icon {
    animation: move-car 8s ease-in-out infinite;
}

@keyframes move-car {
    0%, 100% {
        transform: translateX(0);
    }
    50% {
        transform: translateX(30px);
    }
}

.current-symbol {
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% {
        opacity: 0.7;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

.electrolysis-cell {
    filter: drop-shadow(0px 0px 15px rgba(45, 212, 191, 0.5));
}

.molecules text {
    font-family: 'Inter', sans-serif;
}

.molecules circle {
    animation: pulse-molecule 3s ease-in-out infinite;
}

@keyframes pulse-molecule {
    0%, 100% {
        transform: scale(1);
        opacity: 0.8;
    }
    50% {
        transform: scale(1.1);
        opacity: 1;
    }
}

.arrows path {
    animation: flow 2s linear infinite;
    stroke-dasharray: 20;
    stroke-dashoffset: 80;
}

@keyframes flow {
    to {
        stroke-dashoffset: 0;
    }
}

/* 联系我们区域样式 */
.contact-btn {
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.contact-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.7s ease;
    z-index: -1;
}

.contact-btn:hover::before {
    left: 100%;
}

/* 关于我们页面样式 */
.about-title-section {
    position: relative;
}

.about-title-section::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background-color: #fff;
}

.about-section-title {
    position: relative;
    display: inline-block;
}

.about-section-title h2 {
    color: #ccc;
    font-weight: 300;
}

.about-section-title h3 {
    color: #10b981;
    font-weight: 700;
}

.about-image {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.about-image:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.about-image img {
    transition: all 0.5s ease;
}

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

/* 响应式调整 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .pem-diagram svg {
        height: 300px;
    }
    
    .about-title-section::after {
        width: 40px;
        height: 3px;
    }
    
    .about-section-title h2 {
        font-size: 2.5rem;
    }
    
    .about-section-title h3 {
        font-size: 1.75rem;
    }
}

/* 移动菜单 */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.mobile-menu.active {
    transform: translateX(0);
}

/* AOS动画自定义 */
[data-aos] {
    opacity: 0;
    transition-property: opacity, transform;
}

[data-aos].aos-animate {
    opacity: 1;
}