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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

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

/* 导航栏样式 */
.navbar {
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2px 25px;
    max-width: 1200px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 180px;
    height: 68px;
    object-fit: contain;
    display: block;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #FFD700;
}



.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* 首页部分 */
.hero {
    background: #fafbf8;
    padding: 100px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 300px;
    height: 300px;
    background: url('../images/hero-left.png') no-repeat center;
    background-size: contain;
    opacity: 0.8;
    z-index: 1;
}

.hero::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 300px;
    height: 300px;
    background: url('../images/hero-right.png') no-repeat center;
    background-size: contain;
    opacity: 0.8;
    z-index: 1;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: bold;
    color: #333;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 18px;
    color: #666;
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 30px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: #FFD700;
    color: #333;
}

.btn-primary:hover {
    background: #FFC107;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: #333;
    border: 2px solid #333;
}

.btn-secondary:hover {
    background: #333;
    color: white;
    transform: translateY(-2px);
}

/* 服务部分 */
.services {
    padding: 60px 0 100px 0;
    background: linear-gradient(rgba(26, 26, 26, 0.4), rgba(45, 45, 45, 0.4)), url('../images/services-bg.png') center/cover;
    position: relative;
    overflow: hidden;
    min-height: 500px;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 60%, rgba(255, 215, 0, 0.05) 0%, transparent 50%);
    background-size: 300px 300px, 400px 400px, 200px 200px;
    animation: float 20s ease-in-out infinite;
    z-index: 1;
}

.services::after {
    content: '01001000 01100101 01101100 01101100 01101111 00100000 01010111 01101111 01110010 01101100 01100100 00001010 01000100 01100001 01110100 01100001 00100000 01010011 01100011 01101001 01100101 01101110 01100011 01100101 00001010 01000001 01110010 01110100 01101001 01100110 01101001 01100011 01101001 01100001 01101100 00100000 01001001 01101110 01110100 01100101 01101100 01101100 01101001 01100111 01100101 01101110 01100011 01100101';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    color: rgba(255, 215, 0, 0.1);
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.5;
    padding: 15px;
    animation: binaryFlow 30s linear infinite;
    z-index: 1;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-20px) rotate(1deg); }
    66% { transform: translateY(-10px) rotate(-1deg); }
}

@keyframes binaryFlow {
    0% { transform: translateY(100%); }
    100% { transform: translateY(-100%); }
}

.services .container {
    position: relative;
    z-index: 2;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 10px;
}

.section-header h2 {
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: #FFD700;
}

.products .section-header h2 {
    font-size: 42px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.case-studies .section-header h2 {
    font-size: 42px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.about .section-header h2 {
    font-size: 42px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.products .section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: #FFD700;
}

.contact .section-header h2 {
    font-size: 42px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
}

.contact .section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: #FFD700;
}

.contact .section-header h2 {
    font-size: 42px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
    text-align: center;
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
}

.products .section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: #FFD700;
}

.services .section-header h2 {
    font-size: 42px;
    font-weight: bold;
    color: #ffffff;
    margin-bottom: 10px;
    position: relative;
    display: inline-block;
    padding-bottom: 15px;
    text-align: center;
}

.services .section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: #FFD700;
}

.services .section-header p {
    font-size: 18px;
    color: #cccccc;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.4;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    max-width: 1000px;
    margin: 0 auto;
}

@media (max-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
}

@media (max-width: 768px) {
    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

.service-card {
    padding: 25px 20px;
    border-radius: 10px;
    text-align: left;
    transition: all 0.3s ease;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    min-height: 250px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.service-header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 20px;
}

.service-card.yellow {
    background: linear-gradient(135deg, #FFD700 0%, #FFC107 100%);
    color: #333;
}

.service-card.white {
    background: #ffffff;
    color: #333;
    border: 1px solid #e9ecef;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.service-icon {
    font-size: 40px;
    margin-bottom: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.service-icon img {
    width: 70px;
    height: 70px;
    object-fit: contain;
    background-color: #FFD700;
    border-radius: 50%;
    padding: 12px;
}

.service-card.yellow .service-icon {
    color: #333;
}

.service-card.white .service-icon {
    color: #FFD700;
}

.service-card h3 {
    font-size: 20px;
    font-weight: bold;
    margin: 0;
    line-height: 1.3;
    text-align: left;
    display: flex;
    align-items: center;
}

.service-card p {
    font-size: 14px;
    line-height: 1.6;
    flex-grow: 1;
    text-align: left;
    width: 100%;
}

/* 产品部分 */
.products {
    padding: 60px 0;
    background: #f5f3e7;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .products-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .product-card {
        flex-direction: row;
        align-items: center;
    }
    
    .product-icon {
        width: 60px;
        height: 60px;
        margin-right: 15px;
    }
}

.product-card {
    padding: 15px;
    border-radius: 15px;
    text-align: left;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    min-height: 130px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.product-header {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}

.product-card.yellow {
    background: linear-gradient(135deg, #FFD700 0%, #FFC107 100%);
    color: #333;
}

.product-card.black {
    background: linear-gradient(135deg, #333 0%, #555 100%);
    color: white;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.product-icon {
    font-size: 30px;
    margin-right: 20px;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
}

.product-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 12px;
}

.product-card.yellow .product-icon {
    background: #fff;
    color: #333;
    border: none;
}

.product-card.yellow .product-icon img {
    /* 移除滤镜，显示原始图标颜色 */
    filter: none;
}

.product-card.black .product-icon {
    background: #fff;
    color: #FFD700;
    border: none;
}

.product-card.black .product-icon img {
    /* 移除滤镜，显示原始图标颜色 */
    filter: none;
}

.product-card h3 {
    font-size: 18px;
    font-weight: bold;
    margin: 0;
    display: flex;
    align-items: center;
    line-height: 1.3;
    margin-top: 0;
}

.product-card p {
    font-size: 14px;
    line-height: 1.5;
    flex-grow: 1;
    padding-left: 90px;
}

.product-content {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

/* 关于我们部分 */
.about {
    padding: 80px 0;
    background: #f5f3e7;
}

.mission-text {
    color: #FFD700 !important; /* 确保Our Mission下的文字是黄色 */
}

.about-card {
    background: url('../images/about-us-02.png') no-repeat center center;
    background-size: cover;
    border-radius: 20px;
    padding: 30px;
    color: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
    z-index: 2;
    max-width: 85%;
    margin: 0 auto;
    min-height: 350px;
    max-height: 400px;
}

/* 移除多余的遮罩层 */

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 20px;
    align-items: stretch;
    position: relative;
    z-index: 2;
    max-width: 100%;
}

.about-left {
    text-align: left;
    background: transparent;
    padding: 20px 25px;
    margin-top: 70px; /* 进一步增加顶部边距，从50px增加到70px */
    margin-left: 0;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    min-height: 120px;
    max-width: 100%;
}

.about-left .content-wrapper {
    margin-top: 40px; /* 进一步增加内容包装器的顶部边距，从30px增加到40px */
    position: relative;
    z-index: 2;
    padding-top: 0;
}

.about-left h3 {
    font-size: 22px;
    font-weight: bold;
    color: white; /* 恢复为白色 */
    margin-bottom: 15px;
}

.about-left p {
    font-size: 13px;
    line-height: 1.5;
    color: white; /* 恢复为白色 */
    word-break: normal;
    white-space: normal;
    text-align: left;
    hyphens: auto;
    overflow-wrap: break-word;
    padding: 0;
    margin: 0;
    background: none;
    border: none;
    font-weight: normal; /* 确保详细描述不使用粗体 */
}

.about-right {
    display: flex;
    flex-direction: column;
    gap: 15px; /* 减小垂直间距，从40px减小到15px */
    background: transparent;
    padding: 20px;
}

.about-section h3 {
    font-size: 22px; /* 减小标题字体大小，从26px减小到22px */
    font-weight: bold;
    color: #FFD700;
    margin-bottom: 10px; /* 减小标题与内容的间距，从20px减小到10px */
}

.about-section p {
    font-size: 11px; /* 减小字体大小，从14px减小到11px */
    line-height: 1.4; /* 减小行高，从1.6减小到1.4 */
    color: white; /* 恢复为白色，只有Our Mission下的段落需要是黄色 */
    text-align: left; /* 改为左对齐，与图片一致 */
    word-break: normal;
    overflow-wrap: break-word;
}

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

.advantage-list li {
    font-size: 11px; /* 减小字体大小，从14px减小到11px */
    line-height: 1.4; /* 减小行高，从1.8减小到1.4 */
    color: white; /* 恢复为白色 */
    margin-bottom: 6px; /* 减小列表项间距，从12px减小到6px */
    display: block;
    text-align: left;
    word-break: normal;
    overflow-wrap: break-word;
    position: relative;
    padding-left: 20px; /* 为对勾符号留出空间 */
}

.advantage-list li::before {
    content: "✓";
    color: #FFD700; /* 金色对勾 */
    font-weight: bold;
    position: absolute;
    left: 0;
    top: 0;
    font-size: 14px; /* 稍微大一点的对勾 */
}

/* 成功案例部分 */
.case-studies {
    padding: 80px 0;
    background: #f5f3e7;
}

.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    max-width: 1000px;
    margin: 40px auto 0;
}

.case-study-card {
    background: transparent;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
}

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

/* AIMSCAP 卡片样式 */
.aimscap-card .case-study-header {
    background: url('../images/case-study-left.png') no-repeat center center;
    background-size: cover;
    padding: 0;
    height: 350px;
    position: relative;
    border-radius: 20px;
}

/* AIMSCAP logo样式已移除，因为使用背景图片 */

/* VIP 卡片样式 */
.vip-card .case-study-header {
    background: url('../images/case-study-right.png') no-repeat center center;
    background-size: cover;
    padding: 0;
    height: 350px;
    position: relative;
    border-radius: 20px;
}

/* VIP卡片设计元素样式已移除，因为使用背景图片 */

.case-study-content {
    padding: 30px;
    color: #333;
}

.case-study-content h3 {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #333;
}

/* 隐藏卡片内容区域，因为所有内容都在背景图片中 */
.aimscap-card .case-study-content,
.vip-card .case-study-content {
    display: none;
}

.case-study-content p {
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

@media (max-width: 768px) {
    .case-studies-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* 联系我们部分 */
.contact {
    padding: 50px 0 80px 0;
    background: url('../images/第六屏-背景图.png') no-repeat center center;
    background-size: cover;
    background-attachment: fixed;
    color: white;
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.contact > * {
    position: relative;
    z-index: 2;
}

.contact .section-header h2 {
    color: white;
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
}

.contact .section-header p {
    color: #e9ecef;
    font-size: 18px;
    margin-bottom: 40px;
}

.contact-wrapper {
    max-width: 920px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid #FFD700;
    border-radius: 20px;
    padding: 35px 35px 17px 35px;
    backdrop-filter: blur(10px);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
    position: relative;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item {
    margin-bottom: 3px;
}

.contact-label {
    color: #FFD700;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 5px;
}

.contact-value {
    color: #ccc;
    font-size: 14px;
    line-height: 1.6;
    margin: 0;
}

.contact-bottom {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-top: 1px;
    grid-column: 1 / -1;
}

.contact-btn {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: #000;
    padding: 15px 40px;
    border: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.3);
}

/* 成功提示消息样式 */
.success-message {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.success-message.show {
    opacity: 1;
    visibility: visible;
}

.success-content {
    background: #1a1a1a;
    border: 2px solid #FFD700;
    border-radius: 15px;
    padding: 40px;
    text-align: center;
    max-width: 500px;
    width: 90%;
    position: relative;
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.success-message.show .success-content {
    transform: scale(1);
}

.success-content i {
    font-size: 60px;
    color: #FFD700;
    margin-bottom: 20px;
    display: block;
}

.success-content h3 {
    color: #FFD700;
    font-size: 24px;
    margin-bottom: 15px;
    font-weight: 600;
}

.success-content p {
    color: #ccc;
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 0;
}

.contact-logo {
    display: flex;
    align-items: center;
    gap: 7px;
    position: absolute;
    bottom: -60px;
    left: 50px;
    z-index: 10;
}

.contact-logo img {
    width: 240px;
    height: 240px;
    object-fit: contain;
}

.contact-logo span {
    color: white;
    font-size: 24px;
    font-weight: bold;
}

.contact-form {
    display: flex;
    flex-direction: column;
}

.form-row {
    margin-bottom: 15px;
}

.form-row input,
.form-row textarea {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 16px;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.form-row textarea {
    height: 80px;
    resize: vertical;
}

.form-row input:focus,
.form-row textarea:focus {
    outline: none;
    border-color: #FFD700;
    background: rgba(255, 255, 255, 0.15);
}

.form-row input::placeholder,
.form-row textarea::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.btn-send {
    background: #FFD700;
    color: #333;
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: -10px;
}

.btn-send:hover {
    background: #FFC107;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 40px 20px;
    }
}

/* 页脚部分 */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 20px 0 60px 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: -20px;
    margin-top: -90px;
    margin-left: 110px;
}

.footer-description {
    color: #999;
    font-size: 12px;
    line-height: 1.1;
    margin: -115px 0 2px 183px;
}

.footer-logo img {
    width: 260px;
    height: 260px;
    object-fit: contain;
}

.footer-logo span {
    color: white;
    font-size: 16px;
    font-weight: normal;
}



.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 0px;
    margin-left: 180px;
}

.footer-contact p {
    color: #999;
    font-size: 12px;
    margin: 0;
    line-height: 1.4;
}

.footer-right {
    display: flex;
    justify-content: flex-end;
}

.footer-links-section {
    display: grid;
    grid-template-columns: 200px 250px;
    gap: 25px;
    margin-left: 0;
    margin-top: 30px;
}

/* Quick Links 列 */
.footer-links-section .quick-links-column {
    margin-left: -80px;
    width: 200px;
    min-width: 200px;
}

/* Products & Services 列 */
.footer-links-section .footer-column.products-services-column {
    transform: translateX(-100px) !important;
    width: 250px;
    min-width: 250px;
}

.footer-column h3 {
    color: #ccc;
    font-size: 14px;
    font-weight: normal;
    margin-bottom: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.footer-column li {
    margin: 0;
    line-height: 1.4;
}

.footer-column a {
    color: #999;
    text-decoration: none;
    font-size: 12px;
    transition: color 0.3s ease;
    display: block;
    word-wrap: break-word;
    hyphens: auto;
}

.footer-column a:hover {
    color: #FFD700;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: #FFD700;
    color: #333;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #FFC107;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .hero-content h1 {
        font-size: 36px;
    }
    
    .services-grid,
    .products-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .case-studies-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        padding: 20px;
    }
    
    .nav-menu.active {
        display: block;
    }
    
    .nav-menu ul {
        flex-direction: column;
        gap: 15px;
    }
    

    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-content h1 {
        font-size: 28px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .services,
    .products,
    .about,
    .case-studies,
    .contact {
        padding: 60px 0;
    }
    
    .section-header h2 {
        font-size: 28px;
        position: relative;
        display: inline-block;
        padding-bottom: 15px;
    }
    
    .section-header h2::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 60px;
        height: 3px;
        background-color: #FFD700;
    }
    
    .services-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .about-card {
        padding: 40px 30px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 30px 20px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .navbar .container {
        padding: 7px 15px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    .hero-content h1 {
        font-size: 24px;
    }
    
    .section-header h2 {
        font-size: 24px;
    }
    
    .service-card,
    .product-card {
        padding: 30px 20px;
    }
    
    .about-card {
        padding: 30px 20px;
    }
    
    .case-study-logo {
        padding: 20px;
        font-size: 20px;
    }
    
    .case-study-content {
        padding: 20px;
    }
}