:root {
    --primary-blue: #1a5f7a;
    --light-blue: #2d82a5;
    --white: #ffffff;
    --light-gray: #f5f5f5;
    --dark-gray: #333333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background-color: var(--white);
    color: var(--dark-gray);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 15px;
}

header {
    background-color: var(--primary-blue);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
    margin-right: 10px;
}

.logo h1 {
    font-size: 24px;
    color: var(--white);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    text-decoration: none;
    color: var(--white);
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

nav ul li a:hover, 
nav ul li a.active {
    background-color: rgba(255, 255, 255, 0.2);;
    color: var(--white);
}

.banner {
    position: relative;
    height: 400px;
    overflow: hidden;
    margin-bottom: 40px;
}

.slides {
    display: flex;
    width: 400%;
    height: 100%;
    transition: transform 0.5s ease;
}

.slide {
    width: 25%;
    height: 100%;
    background-size: cover;
    background-position: center;
    position: relative;
}

.slide-overlay {
    position: absolute;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(26, 95, 122, 0.8);
    color: white;
    padding: 20px 30px;
    text-align: center;
    border-radius: 5px;
    max-width: 600px;
}

.slide-overlay h2 {
    font-size: 2.5em;
    margin-bottom: 10px;
    color: white;
}

.slide-overlay p {
    font-size: 1.2em;
    margin: 0;
}

.slide-controls {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
}

.slide-control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    margin: 0 5px;
    cursor: pointer;
}

.slide-control.active {
    background-color: var(--white);
}

.section-title {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-blue);
    position: relative;
    padding-bottom: 10px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--light-blue);
}

.welcome-section {
    margin: 50px 0;
}

.welcome-content {
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
}

.welcome-text p {
    font-size: 1.1em;
    line-height: 1.8;
    margin-bottom: 25px;
    text-align: left;
}

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

.feature-item {
    background: var(--light-gray);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
}

.feature-item h3 {
    color: var(--primary-blue);
    margin-bottom: 15px;
    font-size: 1.2em;
}

.products {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.product-card {
    background-color: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

.product-img {
    height: 200px;
    overflow: hidden;
}

.product-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.product-info {
    padding: 20px;
}

.product-info h3 {
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.btn {
    display: inline-block;
    background-color: var(--light-blue);
    color: var(--white);
    padding: 8px 15px;
    border-radius: 4px;
    text-decoration: none;
    margin-top: 10px;
    transition: background-color 0.3s ease;
}

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

.btn-large {
    padding: 12px 30px;
    font-size: 1.1em;
    margin-top: 20px;
}

.highlight-products {
    background: var(--light-gray);
    padding: 60px 0;
    margin: 50px 0;
}

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

.product-preview-card {
    background: white;
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.product-preview-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 20px;
}

.why-choose-us {
    padding: 60px 0;
}

.advantages {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.advantage {
    padding: 25px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.industry-applications {
    background: var(--light-gray);
    padding: 60px 0;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.application {
    background: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.cta-section {
    text-align: center;
    padding: 40px;
    background: var(--primary-blue);
    color: white;
    border-radius: 8px;
}

.cta-section h3 {
    color: white;
    margin-bottom: 15px;
    font-size: 1.8em;
}

footer {
    background-color: var(--primary-blue);
    color: var(--white);
    padding: 30px 0;
    margin-top: 50px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo h2 {
    font-size: 20px;
    margin-bottom: 10px;
}

.footer-contact p {
    margin-bottom: 5px;
}

.footer-address {
    text-align: right;
}

.copyright {
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .logo {
        margin-bottom: 15px;
        justify-content: center;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 5px;
    }
    
    .banner {
        height: 250px;
    }
    
    .slide-overlay {
        bottom: 50px;
        padding: 15px 20px;
    }
    
    .slide-overlay h2 {
        font-size: 1.8em;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-address {
        text-align: center;
        margin-top: 20px;
    }
}

/* 在原有CSS文件末尾添加以下样式 */

/* Technical Specifications Styles */
.technical-specs {
    margin-bottom: 50px;
}

.spec-card {
    background-color: var(--white);
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.spec-card h3 {
    color: var(--primary-blue);
    margin-bottom: 20px;
    border-bottom: 2px solid var(--light-gray);
    padding-bottom: 10px;
}

.spec-content {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.spec-table {
    flex: 1;
    min-width: 300px;
}

.spec-table h4 {
    color: var(--dark-gray);
    margin-bottom: 15px;
}

.spec-table table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.spec-table th,
.spec-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--light-gray);
}

.spec-table th {
    background-color: var(--light-gray);
    font-weight: bold;
}

.spec-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 200px;
}

.btn-secondary {
    background-color: var(--light-gray);
    color: var(--dark-gray);
}

.btn-secondary:hover {
    background-color: #e0e0e0;
}

/* About Us Page Styles */
.about-content > div {
    margin-bottom: 40px;
}

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

.mission, .vision {
    background: var(--light-gray);
    padding: 25px;
    border-radius: 8px;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.value-item {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.cert-list p {
    margin: 10px 0;
    padding-left: 20px;
    position: relative;
}

.cert-list p:before {
    content: "✓";
    position: absolute;
   0;
    color: var(--primary-blue);
    font-weight: bold;
}

/* Specification Details Styles */
.spec-detail-container {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.pdf-viewer {
    margin: 20px 0;
    border: 1px solid var(--light-gray);
    border-radius: 5px;
    padding: 20px;
    text-align: center;
}

.upload-section {
    margin: 30px 0;
    padding: 20px;
    background: var(--light-gray);
    border-radius: 5px;
}

.upload-btn {
    background: var(--primary-blue);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-top: 10px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .spec-content {
        flex-direction: column;
    }
    
    .spec-actions {
        flex-direction: row;
        justify-content: space-between;
    }
    
    .mission-vision {
        grid-template-columns: 1fr;
    }
}