/* 配色变量 */
:root {
    --primary-green: #2a6943;
    --secondary-yellow: #f6d32f;
    --dark-green: #1d4c30;
    --light-green: #4a8c5f;
    --bright-yellow: #ffdf5d;
    
    --text-black: #111827;
    --text-gray: #374151;
    --text-light-gray: #6b7280;
    --border-gray: #d1d5db;
    --bg-light: #f9fafb;
    --white: #ffffff;
}

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    touch-action: manipulation;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-gray);
    font-weight: 400;
    background-color: var(--white);
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.animate-on-scroll {
    opacity: 0;
}

.animate-on-scroll.animated {
    animation: fadeInUp 0.2s ease-out forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }
.animate-delay-5 { animation-delay: 0.5s; }
.animate-delay-6 { animation-delay: 0.6s; }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
.header {
    background-color: var(--white);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.header:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

.logo {
    height: 60px;
    transition: transform 0.3s ease;
}

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

.navbar-nav .nav-link {
    color: var(--text-gray);
    font-weight: 500;
    margin-left: 20px;
    position: relative;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--primary-green);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-item.active .nav-link::after {
    width: 100%;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-item.active .nav-link {
    color: var(--primary-green);
}

/* 下拉菜单样式 */
.dropdown-menu {
    border: none;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 10px 0;
    margin-top: 5px;
}

.dropdown-item {
    padding: 10px 20px;
    transition: all 0.3s ease;
    color: var(--text-gray);
}

.dropdown-item:hover {
    background-color: var(--bg-light);
    color: var(--primary-green);
}

/* 移动端下拉菜单 */  
@media (max-width: 992px) {
    .navbar-nav .nav-link {
        margin-left: 0;
        padding: 10px 0;
    }
    
    .dropdown-menu {
        position: static;
        float: none;
        background-color: transparent;
        box-shadow: none;
        border: none;
        padding: 0 0 0 20px;
    }
    
    .dropdown-item {
        padding: 5px 0;
    }
    
    .nav-item.dropdown .nav-link {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .nav-item.dropdown .nav-link::after {
        display: none;
    }
}

/* 轮播图 */
.carousel-section {
    position: relative;
    min-height: 600px;
    height: 80vh;
    max-height: 800px;
    overflow: hidden;
}

.carousel {
    height: 100%;
    position: relative;
}

.carousel-inner {
    height: 100%;
}

.carousel-item {
    height: 100%;
}

.carousel-container {
    position: relative;
    height: 100%;
}

.carousel-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.carousel-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2;
}

.carousel-content {
    position: relative;
    z-index: 3;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 250px;
}

.carousel-text {
    flex: 1;
    color: #fff;
    max-width: 500px;
}

.carousel-brand {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.carousel-product-name {
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--secondary-yellow);
}

.carousel-slogan {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 30px;
}

.carousel-product {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.product-img {
    width: 300px;
    height: 300px;
    object-fit: contain;
    animation: float 3s ease-in-out infinite !important;
    position: relative;
    z-index: 1;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

.carousel-indicators {
    position: absolute !important;
    bottom: 30px !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    z-index: 4 !important;
    list-style: none !important;
    padding: 0 !important;
    margin: 0 !important;
}

.carousel-indicators [data-bs-target] {
    width: 12px !important;
    height: 12px !important;
    border-radius: 50% !important;
    background-color: rgba(255, 255, 255, 0.5) !important;
    margin: 0 8px !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
    border: none !important;
    opacity: 1 !important;
}

.carousel-indicators [data-bs-target].active {
    background-color: var(--primary-green) !important;
    width: 30px !important;
    border-radius: 6px !important;
}

.carousel-control-prev,
.carousel-control-next {
    width: 60px !important;
    height: 60px !important;
    border-radius: 50% !important;
    background-color: rgba(0, 0, 0, 0.5) !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    transition: all 0.3s ease !important;
    z-index: 4 !important;
}

.carousel-control-prev {
    left: 30px !important;
}

.carousel-control-next {
    right: 30px !important;
}

.carousel-control-prev:hover,
.carousel-control-next:hover {
    background-color: rgba(42, 105, 67, 0.8) !important;
}

.carousel-control-prev-icon,
.carousel-control-next-icon {
    width: 24px !important;
    height: 24px !important;
    background-image: none !important;
    position: relative;
}

.carousel-control-prev-icon::before {
    content: '\2039';
    font-size: 60px;
    font-weight: 600;
    color: white;
    line-height: 1;
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.carousel-control-next-icon::before {
    content: '\203A';
    font-size: 60px;
    font-weight: 600;
    color: white;
    line-height: 1;
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* 图片框架优化 */
img {
    max-width: 100%;
    height: auto;
    display: block;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

img:hover {
    opacity: 0.95;
}

/* 图片加载动画 */
img {
    background: linear-gradient(90deg, var(--bg-light) 25%, var(--border-gray) 50%, var(--bg-light) 75%);
    background-size: 200% 100%;
}

img[src] {
    background: none;
    animation: fadeIn 0.5s ease-out;
}

/* 基础样式 */
.products-section,
.advantages-section,
.factory-section,
.company-section,
.stats-section,
.application-section,
.certificate-section,
.news-section {
    padding: 60px 0;
}

.products-section,
.factory-section,
.application-section {
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.section-heading {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-black);
    position: relative;
    display: inline-block;
}

.section-heading::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background-color: var(--primary-green);
}

.product-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
    gap: 20px;
}

.tab-btn {
    padding: 12px 24px;
    background-color: var(--white);
    border: 2px solid var(--border-gray);
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    color: var(--text-gray) !important;
}

.tab-btn:hover,
.tab-btn.active {
    background-color: var(--primary-green);
    color: var(--white) !important;
    border-color: var(--primary-green);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(42, 105, 67, 0.3);
}

.products-grid,
.advantages-grid,
.factory-grid,
.stats-grid,
.application-grid,
.certificate-grid,
.footer-content {
    display: grid;
    gap: 20px;
}

.products-grid {
    grid-template-columns: repeat(3, 1fr);
    display: none;
}

.products-grid.active {
    display: grid;
    animation: fadeIn 0.4s ease-out;
}

.application-grid {
    grid-template-columns: repeat(4, 1fr);
}

.certificate-carousel {
    position: relative;
    overflow: hidden;
}

.certificate-carousel-inner {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.certificate-carousel-item {
    min-width: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease-in-out, visibility 0.5s ease-in-out;
    position: absolute;
    top: 0;
    left: 0;
}

.certificate-carousel-item-active {
    opacity: 1;
    visibility: visible;
    position: relative;
}

.certificate-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    padding: 20px 0;
}

.certificate-item {
    background-color: #fff;
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.certificate-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.certificate-item img {
    width: 100%;
    /*height: 200px;*/
    object-fit: contain;
    transition: transform 0.4s ease;
}

.certificate-item:hover img {
    transform: scale(1.05);
}

.advantages-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.factory-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

.stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-icon {
    width: 50px;
    height: 50px;
    object-fit: contain;
    margin: 0 auto 15px;
    filter: brightness(0) invert(1);
}

.footer-content {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.product-card,
.advantage-card,
.application-card {
    background-color: #fff;
    padding: 5px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.product-card:hover,
.advantage-card:hover,
.application-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.advantage-card {
    background-color: #f5f5f5;
    padding: 30px;
}

.product-card img,
.application-card img,
.certificate-grid img {
    width: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}


.application-card p {
  padding-top: 15px;
}



.product-card:hover img,
.application-card:hover img {
    transform: scale(1.1);
}

.advantage-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-green);
    margin-bottom: 15px;
}

.advantage-card img,
.factory-grid img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

.advantage-card img {
    margin-top: 20px;
}

.factory-grid img {
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.factory-grid img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.company-content {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 40px;
    text-align: left;
}

.company-text {
    flex: 1;
}

.company-content p {
    margin-bottom: 20px;
    color: var(--text-light-gray);
    font-weight: 400;
}

.company-content img {
    width: 300px;
    height: 300px;
    object-fit: cover;
    flex-shrink: 0;
    border-radius: 8px;
}

.stats-section {
    background-color: var(--dark-green);
    color: var(--white);
}

.stat-number {
    font-size: 42px;
    font-weight: 700;
    color: var(--secondary-yellow);
    margin-bottom: 10px;
    transition: transform 0.3s ease, color 0.3s ease;
}

.stat-item:hover .stat-number {
    transform: scale(1.15);
    color: var(--bright-yellow);
}

.stat-item {
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-item p {
    font-size: 16px;
    font-weight: 400;
    transition: color 0.3s ease;
}

.stat-item:hover p {
    color: var(--secondary-yellow);
}

.footer {
    background: linear-gradient(135deg, var(--dark-green) 0%, var(--primary-green) 100%);
    color: var(--white);
    padding: 70px 0 30px;
    position: relative;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo img {
    width: 140px;
    height: auto;
    object-fit: contain;
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

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

.footer-logo p {
    color: var(--secondary-yellow);
    font-size: 15px;
    font-weight: 500;
    margin: 0;
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--secondary-yellow);
    margin-bottom: 20px;
}

.social-icons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
}

.social-icons a:hover {
    background-color: var(--secondary-yellow);
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 8px 20px rgba(246, 211, 47, 0.4);
}

.social-icons img {
    width: 24px;
    height: 24px;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.social-icons a:hover img {
    transform: scale(1.1);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
    font-weight: 400;
}

.footer-back-to-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--light-green) 100%);
    border: none;
    color: var(--white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(42, 105, 67, 0.3);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 100;
}

.footer-back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.footer-back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(42, 105, 67, 0.5);
}

.footer-back-to-top svg {
    width: 24px;
    height: 24px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .carousel-section {
        min-height: 500px;
        height: 70vh;
        max-height: 600px;
    }

    .carousel-content {
        flex-direction: column;
        text-align: center;
        padding: 0 30px;
    }

    .carousel-text {
        text-align: center;
        margin-bottom: 20px;
        max-width: 100%;
        padding-top: 100px;
    }

    .carousel-brand {
        font-size: 36px;
        font-weight: 700;
    }

    .carousel-product-name {
        font-size: 28px;
        font-weight: 600;
    }

    .carousel-slogan {
        font-size: 20px;
        font-weight: 400;
    }

    .carousel-product {
        justify-content: center;
    }

    .product-img {
        width: 250px;
        height: 250px;
    }

    .product-tabs {
        flex-wrap: wrap;
    }

    .tab-btn {
        flex: 1 1 45%;
        text-align: center;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .factory-grid,
    .footer-content {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .certificate-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .application-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .company-content {
        flex-direction: column;
        text-align: center;
    }

    .company-content img {
        width: 250px;
        height: 250px;
    }
}

@media (max-width: 480px) {
    .carousel-section {
        min-height: 400px;
        height: 60vh;
        max-height: 500px;
    }

    .carousel-content {
        padding: 0 20px;
    }

    .section-heading {
        font-size: 24px;
        font-weight: 600;
    }

    .carousel-brand {
        font-size: 28px;
        font-weight: 700;
    }

    .carousel-product-name {
        font-size: 20px;
        font-weight: 600;
    }

    .carousel-slogan {
        font-size: 16px;
        font-weight: 400;
    }

    .product-img {
        width: 200px;
        height: 200px;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .company-content img {
        width: 200px;
        height: 200px;
    }

  
    .footer-content {
        grid-template-columns: 1fr; 
    }

    .application-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.news-section {
    padding: 60px 0;
    background-color: #fff;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-column {
    background-color: #fff;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.news-column:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.news-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    gap: 10px;
}

.news-title-orange,
.news-title-gray {
    padding: 8px 16px;
    font-size: 16px;
    font-weight: 600;
    color: #fff;
}

.news-title-orange {
    background-color: var(--primary-green);
}

.news-title-gray {
    background-color: var(--text-gray);
}

.news-title-white {
    color: var(--text-black);
    font-size: 18px;
    font-weight: 700;
}

.news-more {
    margin-left: auto;
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.news-more:hover {
    color: var(--dark-green);
}

.news-featured {
    margin-bottom: 20px;
}

.news-featured img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 10px;
}

.news-featured-title {
    color: var(--primary-green);
    font-size: 16px;
    font-weight: 600;
}

.news-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.news-list li {
    padding: 10px 0;
    border-bottom: 1px dashed var(--border-gray);
    font-size: 14px;
    line-height: 1.6;
}

.news-list li:last-child {
    border-bottom: none;
}

.news-list li a {
    color: var(--text-gray);
    text-decoration: none;
    transition: color 0.3s ease;
}

.news-list li a:hover {
    color: var(--primary-green);
}

.news-tag {
    color: var(--primary-green);
    font-weight: 500;
    margin-right: 5px;
}

.faq-list {
    margin-top: 10px;
}

.faq-item {
    padding: 12px 0;
    border-bottom: 1px dashed var(--border-gray);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    color: var(--primary-green);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 5px;
}

.faq-answer {
    color: var(--text-light-gray);
    font-size: 13px;
    line-height: 1.6;
}

@media (max-width: 992px) {
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .news-header {
        flex-wrap: wrap;
    }
    
    .news-title-orange,
    .news-title-gray {
        font-size: 14px;
        padding: 6px 12px;
    }
    
    .news-title-white {
        font-size: 16px;
    }
}

.video-section {
    padding: 60px 0;
    background-color: var(--bg-light);
}

.video-subtitle {
    text-align: center;
    color: var(--text-light-gray);
    font-size: 14px;
    margin-top: 10px;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.video-card {
    background-color: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.15);
}

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    overflow: hidden;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: rgba(42, 105, 67, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    transition: all 0.3s ease;
    z-index: 2;
}

.video-card:hover .video-play-btn {
    background-color: rgba(42, 105, 67, 1);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-play-btn svg {
    width: 24px;
    height: 24px;
    margin-left: 4px;
}

.video-title {
    padding: 15px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-gray);
    line-height: 1.5;
    text-align: center;
}

@media (max-width: 992px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .video-play-btn {
        width: 50px;
        height: 50px;
    }
    
    .video-play-btn svg {
        width: 20px;
        height: 20px;
    }
    
    .news-column {
        padding: 15px;
    }
    
    .product-card:hover,
    .advantage-card:hover,
    .application-card:hover,
    .certificate-item:hover,
    .video-card:hover,
    .news-column:hover {
        transform: none;
    }
    
    .tab-btn {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .stat-number {
        font-size: 32px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }

    .social-icons {
        justify-content: center;
    }

    .footer-back-to-top {
        width: 44px;
        height: 44px;
        right: 15px;
        bottom: 60px;
    }
}

@media (max-width: 480px) {
    .products-grid {
        /* grid-template-columns: 1fr; */
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .application-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .company-content img {
        width: 100%;
        height: auto;
        max-width: 250px;
    }
    
    .section-heading {
        font-size: 22px;
    }

    .footer {
        padding: 40px 0 20px;
    }

    .footer-content {
        gap: 25px;
    }

.footer-logo img {
    /* width: 100px; */
    display: block;
    margin: 0 auto;
}

    .footer-logo p {
        font-size: 14px;
    }

    .footer-title {
        font-size: 15px;
        margin-bottom: 15px;
    }

    .footer-contact p {
        font-size: 14px;
        margin-bottom: 8px;
    }

    .social-icons {
        gap: 8px;
    }

    .social-icons a {
        width: 40px;
        height: 40px;
    }

    .social-icons img {
        width: 20px;
        height: 20px;
    }

    .footer-bottom {
        padding-top: 20px;
        font-size: 13px;
    }

    .footer-back-to-top {
        width: 40px;
        height: 40px;
        right: 12px;
        bottom: 50px;
    }

    .footer-back-to-top svg {
        width: 20px;
        height: 20px;
    }
}

.clients-section {
    padding: 60px 0;
    background-color: #fff;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light-gray);
    font-size: 16px;
    margin-top: 15px;
}

.clients-carousel {
    position: relative;
    overflow: hidden;
    padding: 20px 60px;
}

.clients-track {
    overflow: hidden;
}

.clients-slide {
    display: flex;
    gap: 30px;
    align-items: center;
    transition: transform 0.5s ease-in-out;
}

.clients-slide .client-item {
    flex: 0 0 auto;
    width: 180px;
}

.client-item {
    background-color: var(--white);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
}

.client-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.client-item img {
    max-width: 100%;
    max-height: 80px;
    object-fit: contain;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: all 0.4s ease;
}

.client-item:hover img {
    filter: grayscale(0%);
    opacity: 1;
}

.clients-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--white);
    border: 2px solid var(--border-gray);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-gray);
    transition: all 0.3s ease;
    z-index: 10;
}

.clients-nav-prev {
    left: 0;
}

.clients-nav-next {
    right: 0;
}

.clients-nav:hover {
    background-color: var(--primary-green);
    border-color: var(--primary-green);
    color: var(--white);
}

.clients-nav svg {
    width: 20px;
    height: 20px;
}

.friendly-links {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border-gray);
}

.friendly-links-title {
    text-align: center;
    color: var(--text-black);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.friendly-links-list {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.friendly-link {
    color: var(--text-light-gray);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.friendly-link:hover {
    color: var(--primary-green);
}

@media (max-width: 992px) {
    .clients-slide .client-item {
        width: 160px;
    }
}

@media (max-width: 768px) {
    .clients-carousel {
        padding: 20px 50px;
    }
    
    .clients-slide {
        gap: 20px;
    }
    
    .clients-slide .client-item {
        width: 140px;
    }
    
    .client-item {
        min-height: 100px;
        padding: 15px;
    }
    
    .clients-nav {
        width: 40px;
        height: 40px;
    }
    
    .friendly-links-list {
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .clients-slide .client-item {
        width: 120px;
    }
}

.professor-section {
    padding: 70px 0;
    background: linear-gradient(135deg, var(--bg-light) 0%, rgba(42, 105, 67, 0.05) 100%);
}

.professor-content {
    display: flex;
    gap: 60px;
    align-items: center;
    background-color: var(--white);
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.professor-image {
    flex: 0 0 350px;
    position: relative;
}

.professor-image::before {
    content: '';
    position: absolute;
    top: -15px;
    left: -15px;
    right: 15px;
    bottom: 15px;
    border: 3px solid var(--primary-green);
    border-radius: 16px;
    z-index: 0;
}

.professor-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 12px;
    position: relative;
    z-index: 1;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.professor-image:hover img {
    transform: translate(-5px, -5px);
    box-shadow: 0 15px 40px rgba(42, 105, 67, 0.3);
}

.professor-info {
    flex: 1;
}

.professor-name {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-black);
    margin-bottom: 10px;
}

.professor-title {
    font-size: 18px;
    color: var(--primary-green);
    font-weight: 600;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-green);
    display: inline-block;
}

.professor-description {
    margin-bottom: 35px;
}

.professor-description p {
    color: var(--text-light-gray);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 15px;
}

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

.professor-achievements {
    display: flex;
    gap: 40px;
}

.achievement-item {
    text-align: center;
    flex: 1;
}

.achievement-number {
    font-size: 42px;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 8px;
    transition: transform 0.3s ease, color 0.3s ease;
}

.achievement-item:hover .achievement-number {
    transform: scale(1.15);
    color: var(--dark-green);
}

.achievement-label {
    font-size: 14px;
    color: var(--text-light-gray);
    font-weight: 500;
}

@media (max-width: 992px) {
    .professor-content {
        flex-direction: column;
        gap: 40px;
        padding: 40px;
    }

    .professor-image {
        flex: 0 0 auto;
        max-width: 400px;
        margin: 0 auto;
    }

    .professor-image img {
        height: 350px;
    }

    .professor-name {
        font-size: 30px;
        text-align: center;
    }

    .professor-title {
        display: block;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .professor-section {
        padding: 50px 0;
    }

    .professor-content {
        padding: 30px 20px;
    }

    .professor-image {
        max-width: 300px;
    }

    .professor-image::before {
        top: -10px;
        left: -10px;
        right: 10px;
        bottom: 10px;
    }

    .professor-image img {
        height: 300px;
    }

    .professor-name {
        font-size: 26px;
    }

    .professor-title {
        font-size: 16px;
    }

    .professor-description p {
        font-size: 15px;
    }

    .professor-achievements {
        gap: 25px;
    }

    .achievement-number {
        font-size: 36px;
    }
}

@media (max-width: 480px) {
    .professor-section {
        padding: 40px 0;
    }

    .professor-content {
        padding: 25px 15px;
        border-radius: 12px;
    }

    .professor-image {
        max-width: 250px;
    }

    .professor-image img {
        height: 250px;
    }

    .professor-name {
        font-size: 22px;
    }

    .professor-title {
        font-size: 15px;
        margin-bottom: 20px;
        padding-bottom: 12px;
    }

    .professor-description {
        margin-bottom: 25px;
    }

    .professor-description p {
        font-size: 14px;
        line-height: 1.7;
    }

    .professor-achievements {
        gap: 15px;
    }

    .achievement-number {
        font-size: 30px;
    }

    .achievement-label {
        font-size: 13px;
    }
}