/* 全局样式 */
:root {
    --primary-color: #4169E1;
    --secondary-color: #34a853;
    --text-color: #333;
    --light-text: #666;
    --white: #ffffff;
    --light-bg: #F7FAFF;
    --dark-bg: #1a1a1a;
    --gradient-primary: linear-gradient(135deg, #4169E1 0%, #2C4CC0 100%);
    --shadow-sm: 0 2px 4px rgba(65, 105, 225, 0.05);
    --shadow-md: 0 4px 6px rgba(65, 105, 225, 0.1);
    --shadow-lg: 0 10px 15px rgba(65, 105, 225, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

main {
    margin-top: 80px;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
}

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

/* 按钮样式 */
.btn-primary {
    display: inline-block;
    padding: 14px 36px;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: 28px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(65, 105, 225, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(65, 105, 225, 0.3);
}

.btn-outline {
    display: inline-block;
    padding: 14px 36px;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 28px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    margin-left: 16px;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--white);
    box-shadow: 0 4px 12px rgba(65, 105, 225, 0.2);
}

/* 导航栏样式 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--white);
    box-shadow: 0 2px 8px rgba(65, 105, 225, 0.08);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 12px rgba(65, 105, 225, 0.12);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo-img {
    height: 40px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: #333;
    transition: all 0.3s ease;
}

/* Hero部分 */
.hero-section {
    /* padding: 120px 0 80px; */
    background: linear-gradient(135deg, #F7FAFF 0%, #E8F0FE 100%);
    overflow: hidden;
    position: relative;
}

.hero-section .container {
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 40px;
}

.hero-content {
    flex: 1;
    max-width: 420px;
    position: relative;
    z-index: 2;
    padding-top: 40px;
}

.hero-content h1 {
    font-size: 48px;
    line-height: 1.3;
    margin-bottom: 24px;
    color: var(--primary-color);
    font-weight: 600;
}

.hero-content h1 span {
    display: block;
    margin-top: 8px;
}

.hero-content p {
    font-size: 18px;
    color: var(--light-text);
    margin-bottom: 40px;
    line-height: 1.8;
    max-width: 480px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.btn-primary {
    padding: 14px 32px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
}

.btn-primary:hover {
    background: #3158d4;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(65, 105, 225, 0.3);
}

.btn-outline {
    padding: 14px 32px;
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
}

.btn-outline:hover {
    background: rgba(65, 105, 225, 0.05);
    border-color: #3158d4;
    color: #3158d4;
}

.hero-image {
    flex: 1;
    background-image: url('https://kayingaisite0-1333454641.cos.ap-beijing.myqcloud.com/hero2.png');
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    min-height: 400px; /* 确保有一个最小高度以显示背景图 */
}

.hero-image img {
    width: 100%;
    max-width: 720px;
    height: auto;
    object-fit: contain;
}

/* 特性部分 */
.features-section {
    padding: 80px 0;
    background: #F7FAFF;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 48px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin: 0 auto;
    max-width: 1400px;
}

.feature-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 24px;
    transition: var(--transition);
    border: 1px solid #eee;
    display: flex;
    flex-direction: column;
    gap: 16px;
    cursor: pointer;
    position: relative;
    min-height: 320px;
}

.feature-card:hover {
    background: #4169E1;
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-card:hover .feature-header h3,
.feature-card:hover p {
    color: var(--white);
}

.feature-card:hover .feature-icon-wrapper {
    background: rgba(255, 255, 255, 0.2);
}

.feature-card:hover .feature-icon {
    color: var(--white);
}

.feature-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 8px;
}

.feature-icon-wrapper {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #F0F7FF;
    border-radius: 4px;
    transition: var(--transition);
}

.feature-icon {
    font-style: normal;
    font-size: 12px;
    line-height: 1;
    color: var(--primary-color);
    transition: var(--transition);
}

.feature-header h3 {
    font-size: 18px;
    line-height: 1.4;
    margin: 0;
    color: var(--text-color);
    transition: var(--transition);
    font-weight: 500;
}

.feature-card p {
    margin: 0;
    font-size: 14px;
    line-height: 1.6;
    color: var(--light-text);
    transition: var(--transition);
}

.feature-image {
    margin-top: auto;
    text-align: center;
}

.feature-image img {
    width: 120px;
    height: 120px;
    object-fit: contain;
    opacity: 0.8;
    transition: var(--transition);
}

.feature-card:hover .feature-image img {
    opacity: 1;
    filter: brightness(1.2);
}

/* 解决方案部分 */
.solutions-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.solutions-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.solution-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid #e8e8e8;
    padding: 40px;
    box-shadow: var(--shadow-sm);
}

.solution-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.solution-content {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.solution-desc-wrapper {
    flex: 1.2;
    background: #fff;
    padding: 32px;
    border-radius: var(--border-radius);
    border: 1px solid #eef3f8;
    box-shadow: 0 2px 8px rgba(31, 140, 235, 0.05);
}

.solution-desc-wrapper-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.solution-desc-wrapper-title-img {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.solution-desc-wrapper-title h3 {
    margin: 0;
    font-size: 24px;
    color: var(--text-primary);
}

.solution-desc {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.solution-desc p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--light-text);
    margin: 0;
}

.solution-features {
    list-style: none;
    padding: 0;
    margin: 24px 0 0;
}

.solution-features li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 16px;
    color: var(--text-color);
    font-size: 15px;
    line-height: 1.6;
}

.solution-features li::before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-size: 20px;
    line-height: 1;
}

.solution-gallery {
    flex: 1.8;
    display: flex;
    gap: 24px;
    padding: 32px;
    background: #F7FAFF;
    border-radius: var(--border-radius);
    justify-content: center;
}

.gallery-item {
    width: 220px;
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: 
        0 4px 20px rgba(31, 140, 235, 0.08),
        0 2px 8px rgba(31, 140, 235, 0.04),
        0 0 1px rgba(31, 140, 235, 0.12);
}

.gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 20px 40px rgba(31, 140, 235, 0.12),
        0 8px 16px rgba(31, 140, 235, 0.08),
        0 0 1px rgba(31, 140, 235, 0.16);
}

.gallery-item img {
    width: 100%;
    height: auto;
    max-height: 440px;
    object-fit: contain;
}

.gallery-item-img-cover {
    object-fit: fill !important;
}

.gallery-item p {
    padding: 16px;
    margin: 0;
    font-size: 14px;
    color: var(--text-color);
    text-align: center;
    background: var(--white);
    line-height: 1.4;
    font-weight: 500;
    border-top: 1px solid rgba(31, 140, 235, 0.08);
}

.gallery-item .video-player-1 {
    width: 100%;
    height: 440px;
    object-fit: cover;
    transition: var(--transition);
}

.gallery-item .audio-player-1 {
    width: 100%;
    height: 440px;
    background: var(--light-bg);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 自定义音频播放器样式 */
.audio-player-1::-webkit-media-controls-panel {
    background-color: var(--light-bg);
}

.audio-player-1::-webkit-media-controls-play-button,
.audio-player-1::-webkit-media-controls-timeline,
.audio-player-1::-webkit-media-controls-current-time-display,
.audio-player-1::-webkit-media-controls-time-remaining-display,
.audio-player-1::-webkit-media-controls-mute-button,
.audio-player-1::-webkit-media-controls-volume-slider {
    color: var(--primary-color);
}

/* 服务流程部分 */
.process-section {
    padding: 80px 0;
    background: var(--white);
}

.process-timeline {
    position: relative;
    padding: 40px 0;
}

.timeline-dots {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 2px;
    background: #E8F3FF;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1;
}

.timeline-dot {
    width: 12px;
    height: 12px;
    background: #E8F3FF;
    border: 2px solid #4169E1;
    border-radius: 50%;
    transition: var(--transition);
}

.timeline-dot.active {
    background: #4169E1;
}

.process-flow {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    margin: 0 auto;
    max-width: 1200px;
    gap: 20px;
}

.process-item {
    flex: 1;
    text-align: center;
    z-index: 2;
}

.process-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    margin: 10px;
    transition: var(--transition);
    border: 1px solid #E8F3FF;
    cursor: pointer;
}

.process-card:hover {
    background: #4169E1;
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(65, 105, 225, 0.2);
}

.process-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #F7FAFF;
    border-radius: 12px;
    transition: var(--transition);
}

.process-card:hover .process-icon {
    background: rgba(255, 255, 255, 0.1);
}

.process-icon img {
    width: 60%;
    height: 60%;
    object-fit: contain;
    transition: var(--transition);
}

.process-card:hover .process-icon img {
    filter: brightness(0) invert(1);
}

.process-card h3 {
    font-size: 16px;
    color: var(--text-color);
    margin: 0;
    transition: var(--transition);
}

.process-card:hover h3 {
    color: var(--white);
}

/* 联系部分 */
.contact-section {
    padding: 80px 0;
    background: var(--light-bg);
}

.contact-content {
    display: flex;
    align-items: center;
    gap: 48px;
    margin-top: 40px;
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 48px;
    box-shadow: var(--shadow-sm);
}

.contact-info {
    flex: 1;
}

.contact-info h3 {
    font-size: 28px;
    color: var(--text-color);
    margin-bottom: 16px;
}

.contact-info p {
    font-size: 16px;
    color: var(--light-text);
    margin-bottom: 32px;
    line-height: 1.6;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    color: var(--text-color);
}

.contact-form {
    flex: 1;
    max-width: 480px;
}

.contact-form img {
    width: 100%;
    max-height: 280px;
    object-fit: contain;
    border-radius: var(--border-radius);
}

/* 页脚部分 */
.footer {
    background: var(--dark-bg);
    color: var(--white);
    padding: 80px 0 32px;
}

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

.footer-content {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.footer-info {
    flex: 1 1 300px;
}

.footer-info img {
    height: 40px;
    width: auto;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    font-size: 15px;
    margin: 0;
    text-align: left;
}

.footer-links {
    flex: 2 1 600px;
    display: flex;
    gap: 30px;
    justify-content: space-between;
}

.footer-column {
    min-width: 150px;
}

.footer-column h4 {
    color: var(--white);
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 24px;
    position: relative;
    text-align: left;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--primary-color);
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
    text-align: left;
}

.footer-column ul li {
    margin: 0;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    font-size: 15px;
    display: inline-block;
}

.footer-column a:hover {
    color: var(--white);
    transform: translateX(4px);
}

.qrcode-group {
    display: flex;
    gap: 20px;
}

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

.qrcode-item img {
    width: 120px;
    height: 120px;
    margin-bottom: 10px;
}

.qrcode-item p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    margin: 0;
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.beian-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.beian-icon {
    width: 16px;
    height: 16px;
    object-fit: contain;
}

.beian-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
    white-space: nowrap;
}

.beian-link:hover {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
}

.copyright-info p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
    margin: 0;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        padding: 0 40px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .solution-desc-wrapper {
        flex: 1;
    }
    
    .solution-gallery {
        flex: 2;
        gap: 20px;
    }
    
    .gallery-item {
        width: 200px;
    }
    
    .gallery-item img {
        height: 400px;
    }
    
    .hero-content {
        flex: 1;
        padding-top: 20px;
    }
    
    .hero-content h1 {
        font-size: 40px;
    }
    
    .hero-image {
        width: 50%;
        padding-top: 20px;
    }
    
    .footer-content {
        gap: 40px;
    }
    
    .footer-links {
        gap: 30px;
    }
    
    .footer-bottom-content {
        gap: 14px;
    }
    
    .beian-info {
        gap: 10px;
    }
}

@media (max-width: 992px) {
    .hero-section {
        padding: 100px 0 60px;
    }
    
    .hero-section .container {
        flex-direction: column;
        text-align: center;
        gap: 60px;
        align-items: center;
    }
    
    .hero-content {
        max-width: 100%;
        padding-top: 0;
    }
    
    .hero-content p {
        margin: 0 auto 40px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        width: 100%;
        max-width: 600px;
        margin: 0 auto;
        padding-top: 0;
        justify-content: center;
    }
    
    .hero-image img {
        transform: none;
        max-width: 100%;
    }
    
    .solution-content {
        flex-direction: column;
    }
    
    .solution-desc-wrapper {
        width: 100%;
    }
    
    .solution-gallery {
        width: 100%;
        gap: 20px;
    }
    
    .gallery-item {
        width: 180px;
    }
    
    .gallery-item img {
        height: auto;
        max-height: 400px;
        object-fit: contain;
    }
    
    .footer-content {
        flex-direction: column;
        align-items: center;
        gap: 40px;
    }
    
    .footer .container {
        padding: 0 40px;
    }
    
    .qrcode-group {
        width: 100%;
        justify-content: center;
    }
    
    .timeline-dots {
        width: 90%;
    }
    
    .process-flow {
        flex-wrap: wrap;
        gap: 30px;
    }
    
    .process-item {
        flex: 0 0 calc(50% - 15px);
    }

    .contact-content {
        flex-direction: column;
        padding: 32px;
        gap: 32px;
    }

    .contact-form {
        width: 100%;
        max-width: 400px;
    }

    .contact-form img {
        max-height: 240px;
    }

    .footer-links {
        flex-direction: column;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: var(--white);
        padding: 20px;
        box-shadow: var(--shadow-md);
    }
    
    .nav-menu.show {
        display: block;
    }
    
    .nav-menu li {
        margin: 16px 0;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-section {
        padding: 80px 0 40px;
        min-height: auto;
    }
    
    .hero-section .container {
        gap: 40px;
    }
    
    .hero-content h1 {
        font-size: 32px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-outline {
        width: 100%;
        text-align: center;
    }
    
    .hero-image {
        width: 100%;
        min-height: 200px;
        background-size: contain;
        margin: 0 auto;
    }
    
    .features-grid,
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-dots {
        display: none;
    }
    
    .process-flow {
        flex-direction: column;
        gap: 20px;
    }
    
    .process-item {
        flex: 0 0 100%;
    }
    
    .process-card {
        margin: 0;
    }
    
    .contact-section {
        padding: 60px 0;
    }
    
    .contact-content {
        padding: 24px;
        margin-top: 24px;
    }
    
    .contact-info h3 {
        font-size: 24px;
    }
    
    .contact-form img {
        max-height: 200px;
    }
    
    .feature-card {
        padding: 20px;
    }
    
    .solution-card {
        padding: 24px;
    }
    
    .solution-gallery {
        flex-direction: column;
        padding: 16px;
        overflow: hidden;
        align-items: center;
        gap: 24px;
    }

    .gallery-item {
        width: 100%;
        max-width: 300px;
        margin: 0;
        display: flex;
        flex-direction: column;
    }

    .gallery-item img,
    .gallery-item video,
    .gallery-item .video-player-1 {
        width: 100%;
        height: auto;
        max-height: 400px;
        object-fit: contain;
    }

    .gallery-item .audio-player-1 {
        width: 100%;
        height: auto;
        min-height: 100px;
        max-height: 150px;
    }

    .gallery-item p {
        padding: 12px;
        margin-top: auto;
    }

    .solution-content {
        gap: 32px;
    }

    .solution-desc-wrapper {
        margin-bottom: 0;
    }
    
    .footer .container {
        padding: 0 20px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 40px;
        margin-bottom: 40px;
    }
    
    .footer-info,
    .footer-info p,
    .footer-column,
    .footer-column h4,
    .footer-column ul {
        text-align: center;
        align-items: center;
    }
    
    .footer-info {
        align-items: center;
    }
    
    .footer-column h4::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .footer-links {
        flex-wrap: wrap;
    }
    
    .qrcode-group {
        width: 100%;
        justify-content: center;
    }

    .footer-bottom-content {
        gap: 12px;
    }
    
    .beian-info {
        gap: 8px;
        flex-direction: column;
        align-items: center;
    }
    
    .beian-link {
        font-size: 13px;
    }
    
    .copyright-info p {
        font-size: 13px;
        line-height: 1.4;
    }
}


.footer-qrcode {    
    width: 120px;
    max-height: 220px;
}

.chat-wiki {
    width: 100%;
    height: auto;
    max-width: 100%;
    object-fit: contain;
}

.chat-wiki:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 20px 40px rgba(31, 140, 235, 0.12),
        0 8px 16px rgba(31, 140, 235, 0.08),
        0 0 1px rgba(31, 140, 235, 0.16);
}

.text-beian {
    color: inherit; /* 继承父元素的颜色 */
    text-decoration: none; /* 移除下划线 */
}

.text-beian:hover {
    color: inherit; /* 悬停时保持相同颜色 */
    text-decoration: none;
}

/* 确保text-beian类与beian-link样式兼容 */
.text-beian.beian-link {
    color: rgba(255, 255, 255, 0.7);
}

.text-beian.beian-link:hover {
    color: rgba(255, 255, 255, 0.9);
}

/* 移动菜单按钮样式 */
.mobile-menu-btn {
    display: none;
    cursor: pointer;
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #fff;
        padding: 20px 0;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        z-index: 1000;
    }

    .nav-menu.active {
        display: block;
    }

    .nav-menu li {
        display: block;
        margin: 10px 0;
        text-align: center;
    }

    .nav-menu li a {
        display: block;
        padding: 10px;
    }

    /* 隐藏桌面版联系按钮 */
    .contact-btn {
        display: none;
    }

    /* 菜单按钮动画效果 */
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
}