/* 基础样式重置 - 性能优化版 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    text-size-adjust: 100%;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: #333;
    text-rendering: optimizespeed;
    -webkit-font-smoothing: antialiased;
}

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

/* 导航栏样式 - 现代化升级 */
.navbar {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand h2 {
    color: #2c3e50;
    font-weight: 800;
    font-size: 1.8rem;
    background: linear-gradient(135deg, #3498db, #2980b9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover {
    color: #3498db;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    transition: width 0.3s ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #2c3e50;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Hero 区域 - 美化升级 */
.hero {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 50%, #2980b9 100%);
    color: white;
    padding: 160px 0 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="80" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="70" r="1.5" fill="rgba(255,255,255,0.1)"/></svg>');
    animation: float 20s infinite linear;
}

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

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

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    margin-bottom: 3rem;
    opacity: 0.95;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 16px 32px;
    border: none;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.4);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.95);
    color: #2c3e50;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.2);
}

.btn:active {
    transform: translateY(1px);
}

/* 服务区域 - 美化升级版 */
.services {
    padding: 120px 0;
    background: linear-gradient(180deg, #ffffff 0%, #f8f9fa 100%);
    position: relative;
    overflow: hidden;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, 
        transparent, 
        #3498db, 
        #27ae60, 
        #f39c12, 
        #3498db, 
        transparent
    );
    animation: shimmerLine 3s ease-in-out infinite;
}

@keyframes shimmerLine {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

.section-title {
    text-align: center;
    font-size: 3rem;
    color: #2c3e50;
    margin-bottom: 4rem;
    position: relative;
    font-weight: 700;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    border-radius: 2px;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 3rem;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
}

.service-card i {
    font-size: 3rem;
    color: #3498db;
    margin-bottom: 1rem;
}

.service-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.service-card p {
    color: #666;
    margin-bottom: 1rem;
}

.case-study {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid #3498db;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.case-study strong {
    color: #2c3e50;
}

.service-card ul {
    text-align: left;
    list-style: none;
}

.service-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
}

.service-card li:last-child {
    border-bottom: none;
}

/* 优势区域 - 美化升级 */
.advantages {
    padding: 100px 0;
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
    position: relative;
}

/* 核心优势特色列表 */
.advantage-features {
    display: grid;
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-left-color: #3498db;
}

.feature-item i {
    font-size: 1.8rem;
    color: #3498db;
    min-width: 40px;
    text-align: center;
    margin-top: 5px;
}

.feature-item h4 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.feature-item p {
    color: #666;
    line-height: 1.6;
    margin: 0;
}

.feature-item:nth-child(1) i { color: #3498db; }
.feature-item:nth-child(2) i { color: #27ae60; }
.feature-item:nth-child(3) i { color: #f39c12; }
.feature-item:nth-child(4) i { color: #9b59b6; }

.advantages::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(135deg, #3498db, #27ae60, #f39c12);
    border-radius: 2px;
}

.advantages-grid {
    display: grid;
    
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
}

.advantage-item {
    text-align: center;
    padding: 2.5rem 2rem;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #3498db, #2980b9);
    opacity: 0.8;
}

.advantage-item i {
    font-size: 3rem;
    color: #3498db;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.advantage-item h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    font-weight: 700;
}

.advantage-item p {
    color: #666;
    line-height: 1.6;
    font-size: 1rem;
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background: #f8f9fa;
}
.about-wrapper {
    display: grid;
    grid-template-columns: 2fr 1fr;
    align-items: start;
    gap: 3rem;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.about-text p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.core-values {
    margin: 2rem 0;
}

.value-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
    margin-bottom: 1.5rem;
}

.value-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-left-color: #3498db;
}

.value-item i {
    font-size: 2rem;
    color: #3498db;
    min-width: 40px;
    text-align: center;
    margin-top: 5px;
}

.value-item h4 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.value-item p {
    color: #666;
    line-height: 1.6;
    margin: 0;
    font-size: 1rem;
}

.mission-statement {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    padding: 2rem;
    border-radius: 12px;
    margin-top: 2rem;
}

.mission-statement h4 {
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.mission-statement p {
    font-size: 1.1rem;
    opacity: 0.9;
}



.about-text h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.about-text p {
    color: #666;
    margin-bottom: 1rem;
}

.about-stats {
    display: grid;
    gap: 2rem;
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #3498db;
}

.stat-label {
    color: #666;
}

/* 联系我们 */
.contact {
    padding: 80px 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info h3 {
    color: #2c3e50;
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.contact-item i {
    color: #3498db;
    margin-right: 1rem;
    font-size: 1.2rem;
}

/* 二维码区域样式 */
.qrcode-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
}

.qrcode-section h4 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.qrcode-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.qrcode-item {
    text-align: center;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 12px;
    transition: transform 0.3s ease;
     color: #3498db;
     cursor: pointer;
}
.qrcode-item i {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.qrcode-item:hover {
    transform: translateY(-5px);
}

.qrcode-placeholder {
    width: 140px;
    height: 140px;
    margin: 0 auto 1rem;
    background: white;
    border: 2px dashed #3498db;
    border-radius: 10px;
    display: flex;
    overflow: hidden;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #3498db;
}

.qrcode-placeholder i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    
}

.qrcode-placeholder span {
    font-size: 0.9rem;
    font-weight: 500;
}

.qrcode-item p {
    margin: 0;
    color: #666;
    font-weight: 500;
}

.contact-form {
    display: grid;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
}

.contact-form textarea {
    resize: vertical;
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 40px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section a {
    display: block;
    color: #bdc3c7;
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #3498db;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    font-size: 1.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #34495e;
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 导航栏优化 */
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    /* Hero 区域优化 */
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero-content h1 {
        font-size: clamp(2rem, 8vw, 3rem);
        line-height: 1.2;
    }
    
    .hero-content p {
        font-size: clamp(1rem, 4vw, 1.2rem);
        margin-bottom: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 1rem;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    /* 网格布局优化 */
    .services-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    /* 联系信息优化 */
    .contact-item {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    
    .contact-item i {
        margin-right: 0;
        margin-bottom: 0.5rem;
        font-size: 1.5rem;
    }
    
    /* 二维码优化 */
    .qrcode-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .qrcode-item {
        padding: 1.5rem;
    }
    
    .qrcode-placeholder {
        width: 120px;
        height: 120px;
    }
    
    .qrcode-placeholder i {
        font-size: 2rem;
    }
    
    /* 页脚优化 */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .social-links {
        justify-content: center;
        gap: 1.5rem;
    }
    
    /* 移动端特定优化 */
    .container {
        padding: 0 1.5rem;
    }
    
    .service-card,
    .advantage-item {
        padding: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
    
    /* 触摸设备优化 */
    @media (hover: none) {
        .service-card:hover,
        .advantage-item:hover,
        .btn:hover {
            transform: none !important;
        }
        
        .service-card,
        .advantage-item {
            transition: transform 0.2s ease;
        }
        
        .service-card:active,
        .advantage-item:active {
            transform: scale(0.98);
        }
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .service-card,
    .advantage-item {
        padding: 1.5rem;
    }
}

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

.service-card,
.advantage-item,
.about-content,
.contact-content {
    animation: fadeInUp 0.6s ease-out;
}

/* 金融主题动画效果 */
@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

@keyframes rotate {
    0% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(180deg) scale(1.2); }
    100% { transform: rotate(360deg) scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.7; }
    50% { transform: scale(1.3); opacity: 1; }
}

@keyframes fall {
    0% { 
        transform: translateY(-100px) rotate(0deg); 
        opacity: 0; 
    }
    10% { opacity: 1; }
    90% { opacity: 0.8; }
    100% { 
        transform: translateY(100vh) rotate(360deg); 
        opacity: 0; 
    }
}

.finance-particle {
    position: absolute;
    pointer-events: none;
    z-index: 1;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
}

.falling-report {
    position: fixed;
    top: -50px;
    font-size: 2rem;
    opacity: 0;
    z-index: 9999;
    pointer-events: none;
    animation: fall 5s linear forwards;
}

/* 财务报表样式特效 */
.service-card {
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(52, 152, 219, 0.1), transparent);
    transform: rotate(45deg);
    transition: all 0.5s ease;
    opacity: 0;
}

.service-card:hover::before {
    opacity: 1;
    animation: shimmer 1.5s ease-in-out;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

/* 财务主题颜色增强 */
.hero {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 50%, #2980b9 100%);
}

.service-card:nth-child(1) {
    border-top: 4px solid #3498db;
}

.service-card:nth-child(2) {
    border-top: 4px solid #27ae60;
}

.service-card:nth-child(3) {
    border-top: 4px solid #f39c12;
}

/* 数字计数器样式 */
.stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, #3498db, #2980b9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 财务图表效果 */
.advantages-grid {
    position: relative;
}
.advantage-item {
    position: relative;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 8px;
    overflow: hidden;
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(41, 128, 185, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.advantage-item:hover {
    transform: translateY(-8px) scale(1.03);
    transition: all 0.3s ease;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.advantage-item:hover::before {
    opacity: 1;
}

.advantage-item:hover i {
    transform: scale(1.2) rotate(5deg);
    color: #2980b9;
}

.advantage-item:hover h3 {
    color: #2c3e50;
    transform: translateY(-2px);
}

.advantage-item:active {
    transform: translateY(-4px) scale(1.01);
}

.advantage-item::after {
    content: '💎';
    position: absolute;
    top: 0px;
    right: 0px;
    font-size: 1rem;
    opacity: 0.3;
    transform: rotate(15deg);
    transition: all 0.3s ease;
}

.advantage-item:hover::after {
    opacity: 0.8;
    transform: rotate(0deg) scale(1.2);
}

/* 滚动效果 */
html {
    scroll-behavior: smooth;
}

/* 性能优化：减少重绘 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 触摸设备优化 */
@media (pointer: coarse) {
    .nav-link {
        padding: 1rem 0;
    }
    
    .btn {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    z-index: 999;
}

.back-to-top:hover {
    background: #2980b9;
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.back-to-top:active {
    transform: translateY(1px);
}

.back-to-top.visible {
    display: flex;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .hero {
        background: #000000;
    }
    
    .btn-primary {
        background: #000000;
        border: 2px solid #ffffff;
    }
}

/* 悬浮客服二维码 */
.floating-wechat {
    position: fixed;
    right: 30px;
    bottom: 120px;
    z-index: 1000;
}
.floating-wechat:hover .wechat-tooltip  {
     opacity: 1;
     visibility: visible;
     transform: translateX(0);
}

.wechat-button {
    width: 60px;
    height: 60px;
    background: #07C160; /* 微信绿 */
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(7, 193, 96, 0.3);
    transition: all 0.3s ease;
}

.wechat-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(7, 193, 96, 0.4);
}

.wechat-tooltip {
    position: absolute;
    right: 70px;
    bottom: 0;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 15px;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(10px);
    transition: all 0.3s ease;
}

.wechat-tooltip::after {
    content: '';
    position: absolute;
    right: -5px;
    bottom: 10px;
    width: 0;
    height: 0;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    border-left: 5px solid white;
}

.wechat-button:hover .wechat-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.wechat-qrcode {
    margin-bottom: 10px;
    text-align: center;
}

.wechat-qrcode img {
    max-width: 150px;
    max-height: 150px;
    border-radius: 8px;
}

.wechat-tooltip span {
    display: block;
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}