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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

/* 顶部导航栏 */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    padding: 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: 1400px;
    margin: 0 auto;
    gap: 40px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* 主导航 */
.main-nav {
    display: flex;
    align-items: center;
    gap: 30px;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    color: #00d4aa;
    background: rgba(0, 212, 170, 0.1);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: #00d4aa;
    border-radius: 2px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: #00d4aa;
}

.logo img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.search-container {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 25px;
    padding: 0;
    min-width: 280px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-right: 20px;
}

.search-input {
    background: none;
    border: none;
    color: #ffffff;
    padding: 12px 20px;
    font-size: 14px;
    flex: 1;
    outline: none;
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.search-btn {
    background: #00d4aa;
    border: none;
    color: #ffffff;
    padding: 12px 20px;
    border-radius: 0 25px 25px 0;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.search-btn:hover {
    background: #00b894;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* 移动端菜单切换 */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 18px;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

.mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* 移动端导航 */
.mobile-nav {
    display: none;
    background: rgba(26, 26, 46, 0.98);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
}

.mobile-nav-link {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.mobile-nav-link:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.05);
}

.mobile-nav-link.active {
    color: #00d4aa;
    background: rgba(0, 212, 170, 0.1);
    border-left-color: #00d4aa;
}

.btn-register, .btn-login {
    padding: 10px 20px;
    border: none;
    border-radius: 20px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-register {
    background: #00d4aa;
    color: #ffffff;
}

.btn-register:hover {
    background: #00b894;
    transform: translateY(-1px);
}

.btn-login {
    background: transparent;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-login:hover {
    background: rgba(255, 255, 255, 0.1);
}



/* 主要内容区域 */
.main-content {
    margin-top: 70px;
    padding: 30px;
    min-height: calc(100vh - 70px);
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

/* 欢迎区域 */
.welcome-section {
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.1) 0%, rgba(22, 33, 62, 0.3) 100%);
    border-radius: 20px;
    padding: 60px 40px;
    margin-bottom: 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.welcome-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 24px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 20px;
    font-weight: 300;
}

.description {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 30px;
    line-height: 1.8;
    max-width: 600px;
}

.cta-buttons {
    display: flex;
    gap: 15px;
}

.btn-primary, .btn-secondary {
    padding: 15px 30px;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 16px;
}

.btn-primary {
    background: linear-gradient(135deg, #00d4aa, #00b894);
    color: #ffffff;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 212, 170, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #ffffff;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.welcome-stats {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: #00d4aa;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

/* 内容区域 */
.content-section {
    margin-bottom: 50px;
}

.section-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 30px;
    color: #ffffff;
    display: flex;
    align-items: center;
    gap: 15px;
}

.section-title::before {
    content: '';
    width: 4px;
    height: 30px;
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
    border-radius: 2px;
}

/* 视频网格 */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.video-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    border-color: rgba(0, 212, 170, 0.3);
}

.video-thumbnail {
    position: relative;
    height: 160px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.8);
    color: #ffffff;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}

.video-stats {
    position: absolute;
    top: 10px;
    left: 10px;
    display: flex;
    gap: 15px;
}

.video-stats span {
    background: rgba(0, 0, 0, 0.7);
    color: #ffffff;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.age-rating {
    position: absolute;
    top: 10px;
    right: 10px;
    background: #e74c3c;
    color: #ffffff;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
}

.video-info {
    padding: 20px;
}

.video-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #ffffff;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
}

.author {
    display: flex;
    align-items: center;
    gap: 8px;
}

.author-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
}

/* 功能介绍区域 */
.features-section {
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(0, 212, 170, 0.3);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: #ffffff;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #ffffff;
}

.feature-card p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

/* 分类标签 */
.categories-section {
    margin-bottom: 40px;
}

.category-tabs {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.category-tab {
    padding: 12px 25px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.category-tab:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.category-tab.active {
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
    color: #ffffff;
    border-color: transparent;
}

/* 用户引导区域 */
.guide-section {
    margin-bottom: 50px;
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.guide-step {
    display: flex;
    gap: 20px;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.guide-step:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: #ffffff;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #ffffff;
}

.step-content p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

/* 关于我们区域 */
.about-section {
    margin-bottom: 50px;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 25px;
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 20px;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    margin-top: 40px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.highlight-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.highlight-item i {
    font-size: 24px;
    color: #00d4aa;
    width: 40px;
    text-align: center;
}

.highlight-item strong {
    display: block;
    font-size: 20px;
    font-weight: 700;
    color: #ffffff;
}

.highlight-item span {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

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

.image-placeholder {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.2), rgba(116, 185, 255, 0.2));
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.image-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.image-placeholder i {
    font-size: 60px;
    color: #00d4aa;
    margin-bottom: 15px;
}

.image-placeholder p {
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
}

/* 增强平台特色样式 */
.feature-stats {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-stats span {
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
    color: #ffffff;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    display: inline-block;
}

/* 常见问题区域 */
.faq-section {
    margin-bottom: 50px;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    margin-bottom: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(0, 212, 170, 0.3);
}

.faq-question {
    padding: 25px 30px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    user-select: none;
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.05);
}

.faq-question h3 {
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    margin: 0;
    flex: 1;
}

.faq-question i {
    font-size: 16px;
    color: #00d4aa;
    transition: transform 0.3s ease;
    margin-left: 20px;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-item.active {
    background: rgba(0, 212, 170, 0.05);
    border-color: rgba(0, 212, 170, 0.3);
}

.faq-answer p {
    padding: 25px 30px;
    margin: 0;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    font-size: 15px;
}

/* 页脚 */
.footer {
    background: rgba(26, 26, 46, 0.95);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 50px 30px 20px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    max-width: 1400px;
    margin: 0 auto 40px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #00d4aa;
}

.footer-section ul {
    list-style: none;
}

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

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer-section a:hover {
    color: #00d4aa;
}

/* 友情链接特殊样式 */
.footer-section ul li a[target="_blank"]::after {
    content: "↗";
    font-size: 12px;
    margin-left: 4px;
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.footer-section ul li a[target="_blank"]:hover::after {
    opacity: 1;
}



.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .search-container {
        min-width: 220px;
        margin-right: 15px;
    }
    
    .welcome-section {
        flex-direction: column;
        text-align: center;
    }
    
    .welcome-stats {
        flex-direction: row;
        justify-content: center;
        gap: 15px;
    }
    
    .mobile-nav.active {
        display: block;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 12px 15px;
        gap: 20px;
    }
    
    .search-container {
        min-width: 200px;
        margin-right: 10px;
    }
    
    .main-content {
        padding: 20px 15px;
    }
    
    .btn-register, .btn-login {
        padding: 8px 15px;
        font-size: 13px;
    }
    
    .welcome-section {
        padding: 40px 20px;
    }
    
    .welcome-content h1 {
        font-size: 36px;
    }
    
    .subtitle {
        font-size: 20px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .about-highlights {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .stat-item {
        padding: 18px 15px;
    }
    
    .stat-number {
        font-size: 30px;
    }
    
    .highlight-item {
        padding: 18px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .guide-steps {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .nav-container {
        gap: 10px;
    }
    
    .nav-right {
        gap: 8px;
    }
    
    .btn-register, .btn-login {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .search-container {
        min-width: 160px;
        margin-right: 8px;
    }
    
    .mobile-nav-link {
        padding: 12px 20px;
        font-size: 15px;
    }
    
    .about-highlights {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .image-placeholder {
        width: 250px;
        height: 250px;
    }
    
    .image-placeholder i {
        font-size: 50px;
    }
    
    .welcome-stats {
        flex-direction: row;
        gap: 10px;
    }
    
    .stat-item {
        padding: 15px 10px;
        min-width: 0;
        flex: 1;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    .stat-label {
        font-size: 12px;
    }
    
    .highlight-item {
        padding: 15px;
        gap: 10px;
    }
    
    .highlight-item i {
        font-size: 20px;
    }
    
    .feature-card {
        padding: 25px 15px;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        margin-bottom: 15px;
    }
    
    .feature-icon i {
        font-size: 24px;
    }
    
    .category-tabs {
        gap: 10px;
    }
    
    .category-tab {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .footer-section h4 {
        font-size: 16px;
        margin-bottom: 15px;
    }
    
    .footer-section ul li {
        margin-bottom: 8px;
    }
}

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

.feature-card, .guide-step, .highlight-item, .faq-item {
    animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(2) { animation-delay: 0.1s; }
.feature-card:nth-child(3) { animation-delay: 0.2s; }
.feature-card:nth-child(4) { animation-delay: 0.3s; }
.feature-card:nth-child(5) { animation-delay: 0.4s; }
.feature-card:nth-child(6) { animation-delay: 0.5s; }

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 212, 170, 0.6);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 212, 170, 0.8);
}

/* 返回顶部按钮样式 */
.back-to-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #00d4aa, #74b9ff);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 20px;
    cursor: pointer;
    z-index: 1001;
    box-shadow: 0 8px 25px rgba(0, 212, 170, 0.3);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(100px);
}

.back-to-top-btn.show {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top {
    position: fixed !important;
    bottom: 30px !important;
    right: 30px !important;
    width: 56px !important;
    height: 56px !important;
    background: linear-gradient(135deg, #00d4aa, #74b9ff) !important;
    border: none !important;
    border-radius: 50% !important;
    color: white !important;
    font-size: 20px !important;
    cursor: pointer !important;
    z-index: 1001 !important;
    box-shadow: 0 8px 25px rgba(0, 212, 170, 0.3) !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.back-to-top-btn:hover {
    transform: translateY(0) scale(1.1);
    box-shadow: 0 12px 35px rgba(0, 212, 170, 0.4);
}

.back-to-top-btn:active {
    transform: translateY(0) scale(0.95);
}

.back-to-top:hover {
    transform: scale(1.1) !important;
    box-shadow: 0 12px 35px rgba(0, 212, 170, 0.4) !important;
}

.back-to-top:active {
    transform: scale(0.95) !important;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .back-to-top-btn {
        bottom: 20px;
        right: 20px;
        width: 50px;
        height: 50px;
        font-size: 18px;
    }
    
    .back-to-top {
        bottom: 20px !important;
        right: 20px !important;
        width: 50px !important;
        height: 50px !important;
        font-size: 18px !important;
    }
}

@media (max-width: 480px) {
    .back-to-top-btn {
        bottom: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
        font-size: 16px;
    }
    
    .back-to-top {
        bottom: 15px !important;
        right: 15px !important;
        width: 45px !important;
        height: 45px !important;
        font-size: 16px !important;
    }
}