/*
 * 文件用途：企业官网主样式表
 * 创建日期：2023年
 */

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    color: #333;
    line-height: 1.6;
    background-color: #f9f9f9;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: #333;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(to right, #3d84ff, #8c5df9);
    border-radius: 2px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
}

.btn:hover {
    transform: translateY(-3px);
}

.banner {
    position: relative;
    height: 70vh;
    overflow: hidden;
}

.slideshow {
    position: relative;
    height: 100%;
    overflow: hidden;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slide-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff;
    z-index: 1;
}

.slide-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.slideshow-nav {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    z-index: 1;
}

.dot {
    width: 12px;
    height: 12px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    margin: 0 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.dot.active {
    background-color: #fff;
}

.slide-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 1;
    transition: background-color 0.3s ease;
}

.slide-btn:hover {
    background-color: rgba(255, 255, 255, 0.5);
}

.prev-btn {
    left: 20px;
}

.next-btn {
    right: 20px;
}

/* 关于我们 */
.about {
    padding: 100px 0;
}

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

.about-image,
.about-text {
    width: 48%;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* 页脚 */
.footer {
    background-color: #1a1a1a;
    color: #fff;
    padding: 80px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 50px;
}

.footer-info,
.footer-links {
    margin-bottom: 30px;
}

.footer-info {
    width: 40%;
}

.footer h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer h3:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: #3d84ff;
}

.footer-info p {
    margin-bottom: 20px;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    color: #bbb;
}

.footer-links ul li a:hover {
    color: #fff;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 20px;
    border-top: 1px solid #333;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .banner {
        height: 50vh;
    }

    .slideshow, .slide img {
        height: 100%;
    }

    .slide-content h2 {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-content {
        flex-direction: column;
    }

    .about-image,
    .about-text {
        width: 100%;
    }

    .slide-btn {
        display: none;
    }
    
    /* 改进移动端按钮点击区域 */
    .btn, 
    .footer-links a {
        padding: 10px 16px;
        min-height: 44px;
        min-width: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    
    /* 优化移动端表单元素 */
    .form-group input,
    .form-group textarea {
        padding: 12px 16px;
        min-height: 44px;
        font-size: 16px; /* 防止iOS缩放 */
    }
}

/* 根变量 */
:root {
    --primary-color: #3d84ff;
    --secondary-color: #43b0ff;
    --text-color: #333;
    --light-color: #fff;
    --dark-color: #222;
    --gray-color: #f5f5f5;
    --border-color: #eaeaea;
    --transition: all 0.3s ease;
    
    --shadow-small: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-large: 0 8px 24px rgba(0,0,0,0.1);
    
    --border-radius-small: 4px;
    --border-radius-medium: 8px;
    --border-radius-large: 16px;
    --border-radius-full: 9999px;
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
}

/* 标准样式类 */

.container {
    width: 100%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.text-left {
    text-align: left;
}

.text-center {
    text-align: center;
}

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

.hidden {
    display: none;
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* 按钮 */

.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-full);
    font-weight: 500;
    font-size: var(--text-base);
    overflow: hidden;
    z-index: 1;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.5s ease-out;
}

.btn:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

.btn-primary {
    color: white;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
}

.btn-primary:hover {
    background-position: right center;
}

.btn-secondary {
    color: var(--primary-color);
    background-color: transparent;
    border: 2px solid var(--primary-color);
}

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

.btn-outline {
    color: white;
    background-color: transparent;
    border: 2px solid white;
}

.btn-outline:hover {
    color: var(--dark-color);
    background-color: white;
}

.btn-glow {
    color: white;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    box-shadow: 0 0 20px rgba(61, 132, 255, 0.5);
}

.btn-glow:hover {
    box-shadow: 0 0 30px rgba(61, 132, 255, 0.8);
}

/* 页面加载动画 */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--dark-color);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.loader.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.loader-logo {
    width: 100px;
    height: 100px;
    position: relative;
    animation: pulse 2s infinite;
}

.logo-path {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    animation: dash 2s ease-in-out infinite alternate;
}

.loader-text {
    font-size: var(--text-2xl);
    font-weight: 600;
    color: white;
    opacity: 0;
    animation: fadeIn 2s ease-in-out forwards 0.5s;
}

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

@keyframes dash {
    from {
        stroke-dashoffset: 100;
    }
    to {
        stroke-dashoffset: 0;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 页头 */
.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
}

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

.logo {
    font-weight: 700;
    font-size: var(--text-xl);
    display: flex;
    align-items: center;
}

.scrolled .logo {
    transform: scale(0.9);
}

.logo-text {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.menu-toggle {
    display: none;
    cursor: pointer;
    width: 30px;
    height: 20px;
    position: relative;
    z-index: 102;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: #333;
    position: absolute;
    left: 0;
    transition: var(--transition);
}

.scrolled .menu-toggle span {
    background-color: #333;
}

/* FAQ样式 */
.faq-section {
    padding: 6rem 0;
    background-color: var(--light-color);
}

.faq-wrapper {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

.faq-category {
    margin-bottom: 3rem;
}

.category-title {
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.faq-item {
    margin-bottom: 1.5rem;
    background-color: white;
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-small);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    cursor: pointer;
    background-color: white;
}

.faq-question h3 {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--dark-color);
    margin: 0;
    flex: 1;
}

.toggle-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 24px;
    height: 24px;
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-item.active .toggle-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    background-color: rgba(61, 132, 255, 0.05);
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding: 1.25rem;
}

.faq-answer p {
    margin: 0 0 1rem;
    color: var(--text-color);
    line-height: 1.7;
}

.faq-answer ul,
.faq-answer ol {
    margin: 0 0 1rem 1rem;
    color: var(--text-color);
    line-height: 1.7;
}

.faq-answer ul li,
.faq-answer ol li {
    margin-bottom: 0.5rem;
}

.faq-answer ul {
    list-style-type: disc;
}

.faq-answer ol {
    list-style-type: decimal;
}

@media (max-width: 768px) {
    .faq-question h3 {
        font-size: 1rem;
        padding-right: 1rem;
    }

    .toggle-icon {
        width: 20px;
        height: 20px;
        font-size: 1.25rem;
    }

    .faq-answer {
        font-size: 0.9rem;
    }
}

/* 案例展示页面样式 */
.cases-filter {
    margin: 3rem 0;
    text-align: center;
}

.filter-buttons {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background-color: white;
    border: 1px solid #eee;
    border-radius: var(--border-radius-full);
    color: var(--text-color);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover, .filter-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.cases-showcase {
    padding: 3rem 0;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

/* 更新的案例展示样式 - 与服务项目卡片兼容 */
.showcase-grid {
    margin-top: 2rem;
}

.showcase-item {
    position: relative;
    overflow: hidden;
}

.showcase-item .showcase-image {
    margin: 1.5rem 0;
    border-radius: var(--border-radius-medium);
    overflow: hidden;
    position: relative;
}

.showcase-item .showcase-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.8s ease;
    border-radius: var(--border-radius-medium);
}

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

.service-link {
    margin-top: 1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* 原有案例样式 - 保留向后兼容性 */
.case-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-medium);
    transition: all 0.3s ease;
}

.case-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-large);
}

.case-image {
    position: relative;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    transition: transform 0.8s ease;
}

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

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    transform: translateY(20%);
    opacity: 0.9;
    transition: all 0.3s ease;
}

.case-item:hover .case-overlay {
    transform: translateY(0);
}

.case-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: white;
    margin-bottom: 0.5rem;
}

.case-category {
    font-size: var(--text-sm);
    color: var(--text-color);
    margin-bottom: 1rem;
}

.case-link {
    display: inline-flex;
    align-items: center;
    color: white;
    font-weight: 500;
    position: relative;
}

.case-link::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: white;
    transition: width 0.3s ease;
}

.case-link:hover::after {
    width: 100%;
}

/* 媒体查询响应式设计 */
@media (max-width: 992px) {
    .showcase-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .showcase-grid {
        grid-template-columns: 1fr;
    }
    
    .showcase-item .showcase-image img {
        height: 180px;
    }
}

.cases-process {
    padding: 6rem 0;
    background-color: var(--light-color);
}

.process-steps {
    position: relative;
    max-width: 1000px;
    margin: 3rem auto 0;
}

.process-steps::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 50px;
    width: 2px;
    height: calc(100% - 60px);
    background-color: var(--primary-color);
}

.process-step {
    display: flex;
    margin-bottom: 4rem;
    position: relative;
}

.step-number {
    flex-shrink: 0;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-size: var(--text-3xl);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 2rem;
    box-shadow: var(--shadow-medium);
    position: relative;
    z-index: 1;
}

.step-content h3 {
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.step-content p {
    font-size: var(--text-lg);
    color: var(--text-color);
    line-height: 1.7;
}

/* 页面头部通用样式 */
.page-header {
    padding: 10rem 0 5rem;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.page-title {
    font-size: var(--text-5xl);
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-desc {
    font-size: var(--text-xl);
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;
}

@media (max-width: 768px) {
    .page-header {
        padding: 8rem 0 4rem;
    }

    .page-title {
        font-size: var(--text-4xl);
    }

    .page-desc {
        font-size: var(--text-lg);
    }
} 

/* 客户评价轮播 */
.testimonials {
    padding: 5rem 0;
    background-color: #f9f9f9;
    overflow: hidden;
}

.testimonials-container {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 0;
}

.testimonial-slider {
    display: flex;
    transition: transform 0.5s ease;
}

.testimonial-item {
    flex: 0 0 100%;
    padding: 2rem;
    background-color: white;
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-small);
    margin: 0 1rem;
    transition: all 0.3s ease;
}

.testimonial-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.testimonial-content {
    position: relative;
    padding: 1.5rem;
    margin-bottom: 2rem;
    background-color: #f5f7ff;
    border-radius: var(--border-radius-medium);
}

.testimonial-content:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 30px;
    width: 20px;
    height: 20px;
    background-color: #f5f7ff;
    transform: rotate(45deg);
}

.testimonial-content p {
    position: relative;
    font-style: italic;
    color: var(--text-color);
    line-height: 1.8;
}

.testimonial-content p:before {
    content: '"';
    font-size: 3rem;
    line-height: 0;
    position: absolute;
    top: 15px;
    left: -15px;
    color: var(--primary-color);
    opacity: 0.2;
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    margin-right: 1rem;
    overflow: hidden;
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-details h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--dark-color);
}

.author-details p {
    font-size: var(--text-sm);
    color: #777;
}

.testimonial-nav {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.testimonial-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: white;
    border: 1px solid var(--border-color);
    margin: 0 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.testimonial-dots {
    display: flex;
    justify-content: center;
    margin-top: 1.5rem;
}

.testimonial-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #ccc;
    margin: 0 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.testimonial-dot.active {
    background-color: var(--primary-color);
}

/* 联系表单样式增强 */
.contact-form {
    position: relative;
    background-color: white;
    padding: 2.5rem;
    border-radius: var(--border-radius-medium);
    box-shadow: var(--shadow-medium);
}

.form-title {
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--dark-color);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    background-color: #f9f9f9;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(61, 132, 255, 0.15);
    outline: none;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    text-align: right;
}

/* 优化表单交互反馈 */
.form-group.error input,
.form-group.error textarea {
    border-color: var(--color-danger, #dc3545);
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.15);
}

.form-group.error::after {
    content: attr(data-error);
    color: var(--color-danger, #dc3545);
    font-size: 0.85rem;
    margin-top: 5px;
    display: block;
}

/* 增强按钮悬停效果 */
.btn {
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.1);
    z-index: -1;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.btn:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* 针对触摸设备优化 */
@media (hover: none) {
    .btn:hover::after {
        /* 触摸设备上禁用悬停效果 */
        transform: scaleX(0);
    }
    
    /* 为触摸设备添加活动状态 */
    .btn:active::after {
        transform: scaleX(1);
        opacity: 0.5;
        transition: transform 0.1s ease, opacity 0.1s ease;
    }
}

/* 响应式增强 */
@media (max-width: 992px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .service-item {
        padding: 1.5rem;
    }
    
    .hero-title {
        font-size: var(--text-4xl);
    }
    
    .about-inner, 
    .contact-inner {
        flex-direction: column;
    }
    
    .about-content, 
    .about-image,
    .contact-info, 
    .contact-form {
        width: 100%;
    }
    
    .about-image {
        margin-top: 3rem;
    }
    
    .contact-info {
        margin-bottom: 3rem;
    }
    
    .ai-lab-inner {
        flex-direction: column;
    }
    
    .ai-lab-content, 
    .ai-lab-visual {
        width: 100%;
    }
    
    .ai-lab-visual {
        margin-top: 3rem;
    }
}

@media (max-width: 768px) {
    /* 删除导航相关样式，使用nav-fix.css的统一样式 */
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        margin: 0.5rem 0;
        width: 100%;
    }
    
    .section-title {
        font-size: var(--text-3xl);
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        margin-bottom: 2rem;
    }
    
    .footer-inner {
        flex-direction: column;
    }
    
    .footer-info, 
    .footer-links {
        width: 100%;
        margin-bottom: 2rem;
    }
    
    .footer-links {
        flex-direction: column;
    }
    
    .footer-links-column {
        width: 100%;
        margin-bottom: 1.5rem;
    }
    
    .about-features {
        flex-wrap: wrap;
    }
    
    .about-feature {
        width: 50%;
        margin-bottom: 1.5rem;
    }
    
    .ai-feature {
        width: 50%;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: var(--text-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--text-base);
    }
    
    .section-title {
        font-size: var(--text-2xl);
    }
    
    .section-desc {
        font-size: var(--text-base);
    }
    
    .ai-lab-features {
        flex-wrap: wrap;
    }
    
    .about-feature {
        width: 100%;
    }
    
    .ai-feature {
        width: 100%;
    }
    
    .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .copyright {
        margin-bottom: 1rem;
    }
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 99;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    background-color: var(--secondary-color);
}

@media (max-width: 576px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: var(--text-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--text-base);
    }
    
    .section-title {
        font-size: var(--text-2xl);
    }
    
    .section-desc {
        font-size: var(--text-base);
    }
    
    .ai-lab-features {
        flex-wrap: wrap;
    }
    
    .about-feature {
        width: 100%;
    }
    
    .ai-feature {
        width: 100%;
    }
    
    .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .copyright {
        margin-bottom: 1rem;
    }
}

/* 版权栏样式 */
.copyright-bar {
    background-color: #000;
    color: rgba(255, 255, 255, 0.7);
    padding: 15px 0;
    text-align: center;
    font-size: 0.9rem;
    width: 100%;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    position: relative !important;
    z-index: 100 !important;
}

.copyright-bar p {
    margin: 5px 0;
    display: block !important;
}

.copyright-bar a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
    display: inline-block !important;
}

.copyright-bar a:hover {
    color: #fff;
}