/* 全局样式 */
:root {
    --primary-color: #1565c0;
    --primary-light: #5e92f3;
    --primary-dark: #003c8f;
    --secondary-color: #2962ff;
    --secondary-light: #768fff;
    --secondary-dark: #0039cb;
    --accent-color: #2979ff;
    --accent-light: #75a7ff;
    --accent-dark: #004ecb;
    --success-color: #4caf50;
    --warning-color: #ffc107;
    --text-color: #212121;
    --text-light: #757575;
    --bg-color: #fff;
    --bg-light: #f5f7fa;
    --bg-dark: #e3f2fd;
    --bg-gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
    --max-width: 1200px;
}

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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-dark);
}

ul {
    list-style: none;
}

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

.btn {
    display: inline-block;
    padding: 12px 25px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 4px;
    text-align: center;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.7s ease;
    z-index: -1;
}

.btn:hover {
    background-color: var(--primary-dark);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.25);
}

.btn:hover::before {
    left: 100%;
}

/* 头部导航栏 */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

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

.logo-image {
    height: 40px;
    margin-right: 10px;
    transition: transform 0.3s ease;
}

.logo:hover .logo-image {
    transform: rotate(5deg);
}

.logo h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: bold;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    color: var(--text-color);
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 3px;
    transition: all 0.3s ease;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--primary-color);
    background-color: rgba(21, 101, 192, 0.08);
}

/* 英雄区块 */
.hero {
    background: var(--bg-gradient);
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.hero .btn:hover {
    background-color: var(--bg-light);
}

/* 特色区块 */
.features {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.features .container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.feature {
    background-color: white;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

.feature:nth-child(2) {
    border-top-color: var(--secondary-color);
}

.feature:nth-child(3) {
    border-top-color: var(--accent-color);
}

.feature:nth-child(4) {
    border-top-color: var(--primary-dark);
}

.feature:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0;
    background: linear-gradient(to bottom, rgba(94, 146, 243, 0.05), transparent);
    transition: all 0.3s ease;
    z-index: 0;
}

.feature:nth-child(2)::before {
    background: linear-gradient(to bottom, rgba(118, 143, 255, 0.05), transparent);
}

.feature:nth-child(3)::before {
    background: linear-gradient(to bottom, rgba(117, 167, 255, 0.05), transparent);
}

.feature:nth-child(4)::before {
    background: linear-gradient(to bottom, rgba(0, 60, 143, 0.05), transparent);
}

.feature:hover::before {
    height: 100%;
}

.feature .icon {
    margin-bottom: 25px;
    position: relative;
    z-index: 1;
}

.feature .icon img {
    width: 80px;
    height: 80px;
    transition: transform 0.3s ease;
}

.feature:hover .icon img {
    transform: scale(1.1);
}

.feature h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.5rem;
    position: relative;
    z-index: 1;
}

.feature:nth-child(2) h3 {
    color: var(--secondary-color);
}

.feature:nth-child(3) h3 {
    color: var(--accent-color);
}

.feature:nth-child(4) h3 {
    color: var(--primary-dark);
}

.feature p {
    color: var(--text-light);
    position: relative;
    z-index: 1;
}

/* 号召行动区块 */
.cta {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
    color: white;
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('images/pattern.png');
    opacity: 0.1;
}

.cta .container {
    position: relative;
    z-index: 1;
}

.cta h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
}

.cta p {
    margin-bottom: 30px;
    font-size: 1.1rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta .btn {
    background-color: var(--accent-light);
    color: white;
    padding: 14px 30px;
}

.cta .btn:hover {
    background-color: var(--accent-color);
}

/* 页脚 */
footer {
    background: linear-gradient(to right, rgba(21, 101, 192, 0.8), rgba(41, 98, 255, 0.8));
    color: white;
    padding: 30px 0 10px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.footer-logo h2 {
    margin-bottom: 8px;
    font-size: 1.6rem;
    color: white;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.9);
}

.footer-links h3, .footer-contact h3 {
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: white;
}

.footer-links ul li {
    margin-bottom: 6px;
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.8);
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.footer-links ul li a:hover {
    color: white;
    padding-left: 5px;
}

.footer-contact p {
    margin-bottom: 6px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 15px;
    margin-top: 20px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.9);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-bottom a:hover {
    color: white;
    text-decoration: underline;
}

/* 响应式设计 */
@media screen and (max-width: 1024px) {
    .features .container {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media screen and (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    
    nav {
        margin-top: 20px;
        width: 100%;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 5px 10px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .features .container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* 轮播图样式 */
.slideshow-container {
    position: relative;
    max-width: 100%;
    overflow: hidden;
    height: 600px;
    margin-bottom: 60px;
}

.slideshow-inner {
    display: flex;
    transition: transform 0.5s ease;
    height: 100%;
}

.mySlides {
    flex: 0 0 100%;
    position: relative;
    height: 100%;
}

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

.slide-caption {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    max-width: 80%;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.slide-caption h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.slide-caption p {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.slide-caption .btn {
    background-color: var(--accent-color);
    color: white;
    margin-top: 10px;
    display: inline-block;
}

.slide-caption .btn:hover {
    background-color: var(--accent-dark);
}

.prev-arrow, .next-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.7);
    color: var(--primary-dark);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 1.5rem;
    opacity: 0.7;
    transition: all 0.3s ease;
    z-index: 5;
}

.prev-arrow {
    left: 20px;
}

.next-arrow {
    right: 20px;
}

.prev-arrow:hover, .next-arrow:hover {
    background-color: rgba(255, 255, 255, 0.9);
    opacity: 1;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}

.dots-container {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    z-index: 5;
}

.dot {
    cursor: pointer;
    height: 14px;
    width: 14px;
    margin: 0 5px;
    background-color: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    display: inline-block;
    transition: all 0.3s ease;
}

.active-dot, .dot:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: scale(1.2);
}

/* 下拉菜单样式 */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: white;
    min-width: 200px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    z-index: 1;
    border-radius: 4px;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: all 0.3s ease;
    white-space: nowrap;
    font-size: 0.95em;
}

.dropdown-content a:hover {
    background-color: var(--bg-light);
    color: var(--primary-color);
    padding-left: 20px;
}

.dropdown::after {
    content: '\f107';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    margin-left: 5px;
    display: inline-block;
    transition: transform 0.3s ease;
}

.dropdown:hover::after {
    transform: rotate(180deg);
}

/* 响应式下拉菜单 */
@media screen and (max-width: 768px) {
    .dropdown-content {
        position: static;
        background-color: rgba(0, 0, 0, 0.03);
        box-shadow: none;
        margin-top: 5px;
        width: 100%;
        border-radius: 4px;
    }
    
    .dropdown {
        width: 100%;
    }
}

/* 页面横幅通用样式 */
.page-banner {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
    color: white;
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('images/pattern.png');
    opacity: 0.1;
}

.page-banner .container {
    position: relative;
    z-index: 1;
}

.page-banner h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.page-banner p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
}

/* 活动介绍区块样式 */
.activities-intro {
    padding: 80px 0;
    background-color: var(--bg-color);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
}

.section-header h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 15px;
}

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

.section-header p {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 活动区块样式 */
.activity-section {
    padding: 80px 0;
    background-color: var(--bg-color);
}

.activity-section.alt-bg {
    background-color: var(--bg-light);
}

.activity-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.activity-content.reverse {
    direction: rtl;
}

.activity-content.reverse .activity-details {
    direction: ltr;
}

.activity-image {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.activity-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
}

.activity-image:hover img {
    transform: scale(1.03);
}

.activity-details h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 15px;
}

.activity-details h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background: var(--accent-color);
}

.activity-description {
    margin-bottom: 30px;
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.8;
}

.activity-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.feature-item {
    text-align: center;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.feature-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature-item h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.feature-item p {
    font-size: 0.95rem;
    color: var(--text-light);
}

.activity-schedule {
    margin-bottom: 30px;
    background-color: var(--bg-light);
    padding: 25px;
    border-radius: 8px;
}

.activity-schedule h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.3rem;
}

.schedule-list {
    list-style: none;
}

.schedule-list li {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.schedule-list li:last-child {
    border-bottom: none;
}

.schedule-list .date {
    font-weight: bold;
    color: var(--accent-color);
}

.schedule-list .title {
    color: var(--text-color);
}

/* 响应式样式 */
@media screen and (max-width: 768px) {
    .activity-content {
        grid-template-columns: 1fr;
    }
    
    .activity-content.reverse {
        direction: ltr;
    }
    
    .activity-image {
        margin-bottom: 30px;
    }
    
    .activity-features {
        grid-template-columns: 1fr;
    }
}

/* 沙盘页面特定样式 */
.sandbox-modules, .sandbox-benefits, .sandbox-cases, .sandbox-outcomes {
    margin-bottom: 30px;
    background-color: var(--bg-light);
    padding: 25px;
    border-radius: 8px;
}

.sandbox-modules h3, .sandbox-benefits h3, .sandbox-cases h3, .sandbox-outcomes h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.3rem;
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.module-item {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.module-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.module-item i {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.module-item h4 {
    margin-bottom: 10px;
    color: var(--text-color);
    font-size: 1.1rem;
}

.module-item p {
    font-size: 0.9rem;
    color: var(--text-light);
}

.sandbox-benefits ul, .sandbox-cases ul, .sandbox-outcomes ul {
    list-style: none;
}

.sandbox-benefits li, .sandbox-cases li, .sandbox-outcomes li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
}

.sandbox-benefits i, .sandbox-cases i, .sandbox-outcomes i {
    color: var(--success-color);
    margin-right: 10px;
    font-size: 1.1rem;
}

@media screen and (max-width: 768px) {
    .module-grid {
        grid-template-columns: 1fr;
    }
}

/* 咨询服务页面特定样式 */
.consulting-process {
    margin-bottom: 30px;
    background-color: var(--bg-light);
    padding: 25px;
    border-radius: 8px;
}

.consulting-process h3, .consulting-offerings h3, .consulting-cases h3, .consulting-benefits h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.3rem;
}

.process-list {
    list-style: none;
}

.process-list li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 20px;
}

.process-list li:last-child {
    margin-bottom: 0;
}

.process-icon {
    width: 35px;
    height: 35px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-right: 15px;
    flex-shrink: 0;
}

.process-content {
    flex: 1;
}

.process-content h4 {
    margin-bottom: 5px;
    color: var(--text-color);
    font-size: 1.1rem;
}

.process-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.consulting-offerings, .consulting-cases, .consulting-benefits {
    margin-bottom: 30px;
    background-color: var(--bg-light);
    padding: 25px;
    border-radius: 8px;
}

.consulting-offerings ul {
    list-style: none;
}

.consulting-offerings li, .consulting-benefits li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.consulting-offerings i, .consulting-benefits i {
    color: var(--success-color);
    margin-right: 10px;
    font-size: 1rem;
}

.consulting-cases p {
    color: var(--text-light);
    line-height: 1.6;
}

@media screen and (max-width: 768px) {
    .process-list li {
        flex-direction: column;
    }
    
    .process-icon {
        margin-bottom: 10px;
    }
}

/* 交流社区页面特定样式 */
.community-content, .community-resources, .community-qa, .community-activities, .community-forum {
    margin-bottom: 30px;
    background-color: var(--bg-light);
    padding: 25px;
    border-radius: 8px;
}

.community-content h3, .community-resources h3, .community-qa h3, .community-activities h3, .community-forum h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.3rem;
}

.community-content ul {
    list-style: none;
}

.community-content li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
}

.community-content i {
    margin-right: 10px;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.resource-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.resource-item {
    background-color: white;
    padding: 15px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.resource-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
}

.resource-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-right: 12px;
}

.resource-item h4 {
    flex: 1;
    margin: 0;
    font-size: 1rem;
}

.resource-link {
    color: var(--accent-color);
    font-weight: bold;
    font-size: 0.9rem;
}

.qa-item {
    margin-bottom: 15px;
    background-color: white;
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.qa-question {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 10px;
    cursor: pointer;
}

.qa-answer {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

.forum-topics {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.forum-topic {
    background-color: white;
    border-radius: 8px;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.forum-topic:hover {
    background-color: var(--bg-light);
    transform: translateX(5px);
}

.topic-title {
    flex: 1;
    font-weight: 500;
    color: var(--text-color);
}

.topic-stats {
    display: flex;
    gap: 15px;
}

.topic-stats span {
    color: var(--text-light);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
}

.topic-stats i {
    margin-right: 5px;
    color: var(--accent-color);
}

@media screen and (max-width: 768px) {
    .resource-list {
        grid-template-columns: 1fr;
    }
    
    .forum-topic {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .topic-stats {
        margin-top: 10px;
    }
}

/* 返回顶部按钮样式 */
.back-to-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

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

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.back-to-top i {
    font-size: 20px;
}

@media (max-width: 768px) {
    .back-to-top {
        right: 20px;
        bottom: 20px;
        width: 40px;
        height: 40px;
    }

    .back-to-top i {
        font-size: 16px;
    }
}