/* 重置默认样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* 头部样式 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.logo h1 {
    font-size: 20px;
    color: #2c3e50;
}

.main-nav ul {
    display: flex;
    list-style: none;
}

.main-nav li {
    margin-left: 30px;
}

.main-nav a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    transition: color 0.3s;
    font-size: 15px;
}

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

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #3498db, #2c3e50);
    color: white;
    padding: 160px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.hero-text {
    flex: 1;
    max-width: 600px;
}

.hero-image {
    flex: 1;
    position: relative;
    min-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.main-image {
    max-width: 80%;
    height: auto;
    animation: float 6s ease-in-out infinite;
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 10px 20px rgba(0,0,0,0.2));
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
}

.float-image {
    position: absolute;
    width: 60px;
    height: 60px;
    animation: float 4s ease-in-out infinite;
    opacity: 0.8;
    filter: drop-shadow(0 5px 10px rgba(0,0,0,0.1));
}

.float-image.speed {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
    transform: rotate(-15deg);
}

.float-image.security {
    top: 40%;
    right: 10%;
    animation-delay: 1s;
    transform: rotate(15deg);
}

.float-image.global {
    bottom: 20%;
    left: 30%;
    animation-delay: 2s;
    transform: rotate(-10deg);
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
    100% {
        transform: translateY(0px);
    }
}

.hero-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 20px;
}

.version-info {
    margin-bottom: 30px;
    font-size: 16px;
}

.version-info span {
    margin: 0 15px;
    padding: 5px 15px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 15px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    margin: 0 10px;
}

.btn-primary {
    background-color: #e74c3c;
    color: white;
}

.btn-secondary {
    background-color: #2ecc71;
    color: white;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 功能特点区域 */
.features {
    padding: 100px 0;
    background-color: #f8f9fa;
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(44, 62, 80, 0.05));
    z-index: 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    color: #2c3e50;
    position: relative;
}

.features-framework {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.features-row {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.features-row:last-child {
    margin-bottom: 0;
}

.feature-item {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
    width: calc(33.333% - 14px);
    min-width: 250px;
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2c3e50);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

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

.feature-icon {
    font-size: 36px;
    margin-bottom: 15px;
    color: #3498db;
}

.feature-item h3 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 18px;
}

.feature-item p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
    font-size: 14px;
}

.feature-details {
    list-style: none;
    margin-top: 15px;
    text-align: left;
}

.feature-details li {
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    color: #555;
    font-size: 14px;
}

.feature-details li:before {
    content: "✓";
    color: #2ecc71;
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* 优势区域 */
.advantages {
    padding: 100px 0;
    background: white;
    position: relative;
}

.advantages::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(44, 62, 80, 0.05));
    z-index: 0;
}

.advantages-framework {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.advantages-row {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.advantages-row:last-child {
    margin-bottom: 0;
}

.advantage-item {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
    width: calc(33.333% - 14px);
    min-width: 250px;
    position: relative;
    overflow: hidden;
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2c3e50);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

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

.advantage-icon {
    font-size: 36px;
    margin-bottom: 15px;
    color: #3498db;
}

.advantage-item h3 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 18px;
}

.advantage-item p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
    font-size: 14px;
}

.advantage-details {
    list-style: none;
    margin-top: 15px;
    text-align: left;
}

.advantage-details li {
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    color: #555;
    font-size: 14px;
}

.advantage-details li:before {
    content: "✓";
    color: #2ecc71;
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* 使用指南区域 */
.guide {
    padding: 100px 0;
    background-color: #f8f9fa;
    position: relative;
}

.guide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(44, 62, 80, 0.05));
    z-index: 0;
}

.guide-framework {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.guide-row {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.guide-row:last-child {
    margin-bottom: 0;
}

.guide-item {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
    width: calc(33.333% - 14px);
    min-width: 250px;
    position: relative;
    overflow: hidden;
}

.guide-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2c3e50);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.guide-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

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

.guide-icon {
    font-size: 36px;
    margin-bottom: 15px;
    color: #3498db;
}

.guide-number {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 30px;
    height: 30px;
    background: #3498db;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 16px;
}

.guide-item h3 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 18px;
}

.guide-item p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
    font-size: 14px;
}

.guide-details {
    list-style: none;
    margin-top: 15px;
    text-align: left;
}

.guide-details li {
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    color: #555;
    font-size: 14px;
}

.guide-details li:before {
    content: "→";
    color: #3498db;
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* FAQ区域 */
.faq {
    padding: 100px 0;
    background: white;
    position: relative;
}

.faq::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(44, 62, 80, 0.05));
    z-index: 0;
}

.faq-framework {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.faq-row {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.faq-row:last-child {
    margin-bottom: 0;
}

.faq-item {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
    width: calc(33.333% - 14px);
    min-width: 250px;
    position: relative;
    overflow: hidden;
}

.faq-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2c3e50);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

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

.faq-icon {
    font-size: 36px;
    margin-bottom: 15px;
    color: #3498db;
}

.faq-item h3 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 18px;
}

.faq-item p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
    font-size: 14px;
}

.faq-details {
    list-style: none;
    margin-top: 15px;
    text-align: left;
}

.faq-details li {
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    color: #555;
    font-size: 14px;
}

.faq-details li:before {
    content: "•";
    color: #3498db;
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* 联系我们区域 */
.contact {
    padding: 100px 0;
    background-color: #f8f9fa;
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(44, 62, 80, 0.05));
    z-index: 0;
}

.contact-framework {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.contact-row {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.contact-row:last-child {
    margin-bottom: 0;
}

.contact-item {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
    width: calc(33.333% - 14px);
    min-width: 250px;
    position: relative;
    overflow: hidden;
}

.contact-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2c3e50);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

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

.contact-icon {
    font-size: 36px;
    margin-bottom: 15px;
    color: #3498db;
}

.contact-item h3 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 18px;
}

.contact-item p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
    font-size: 14px;
}

.contact-details {
    list-style: none;
    margin-top: 15px;
    text-align: left;
}

.contact-details li {
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    color: #555;
    font-size: 14px;
}

.contact-details li:before {
    content: "→";
    color: #3498db;
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* 页脚 */
.footer {
    background-color: #2c3e50;
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 18px;
}

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

.footer-section ul li {
    margin: 10px 0;
}

.footer-section a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

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

/* 页脚友情链接样式 */
.footer-links {
    margin: 40px 0;
    padding: 30px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-links h3 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 18px;
    color: white;
}

.footer-links .links-container {
    max-width: 100%;
    padding: 0;
}

.footer-links .links-container ul {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    list-style: none;
    padding: 0;
}

.footer-links .links-container li {
    background: rgba(255,255,255,0.1);
    padding: 8px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.footer-links .links-container li:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.footer-links .links-container a {
    color: white;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
}

@media (max-width: 768px) {
    .footer-links .links-container ul {
        gap: 10px;
    }

    .footer-links .links-container li {
        padding: 6px 12px;
    }

    .footer-links .links-container a {
        font-size: 13px;
    }
}

@media (max-width: 576px) {
    .footer-links {
        margin: 30px 0;
        padding: 20px 0;
    }

    .footer-links h3 {
        font-size: 16px;
        margin-bottom: 15px;
    }

    .footer-links .links-container ul {
        gap: 8px;
    }

    .footer-links .links-container li {
        padding: 5px 10px;
    }
}

/* 响应式设计优化 */
@media (max-width: 1200px) {
    .container {
        max-width: 960px;
        padding: 0 15px;
    }

    .hero-content h2 {
        font-size: 42px;
    }

    .section-title {
        font-size: 32px;
    }
}

@media (max-width: 992px) {
    .container {
        max-width: 720px;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-image {
        min-height: 300px;
    }

    .main-image {
        max-width: 60%;
    }

    .features-row,
    .advantages-row,
    .guide-row,
    .faq-row,
    .contact-row,
    .download-row {
        flex-wrap: wrap;
        gap: 15px;
    }
    
    .feature-item,
    .advantage-item,
    .guide-item,
    .faq-item,
    .contact-item,
    .download-item {
        width: calc(50% - 8px);
        margin-bottom: 15px;
    }

    .version-info {
        justify-content: center;
    }

    .download-buttons {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .container {
        max-width: 540px;
        padding: 0 15px;
    }

    .header .container {
        height: 50px;
        padding: 0 15px;
        position: relative;
    }

    .logo h1 {
        font-size: 18px;
    }

    .menu-toggle {
        display: block;
        width: 24px;
        height: 20px;
        position: relative;
        cursor: pointer;
        z-index: 1001;
    }

    .menu-toggle span {
        display: block;
        width: 100%;
        height: 2px;
        background: #2c3e50;
        position: absolute;
        left: 0;
        transition: all 0.3s ease;
    }

    .menu-toggle span:nth-child(1) {
        top: 0;
    }

    .menu-toggle span:nth-child(2) {
        top: 9px;
    }

    .menu-toggle span:nth-child(3) {
        top: 18px;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg);
        top: 9px;
    }

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

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg);
        top: 9px;
    }

    .main-nav {
        position: fixed;
        top: 50px;
        left: 0;
        width: 100%;
        background: #fff;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
        z-index: 1000;
        opacity: 0;
        visibility: hidden;
    }

    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .main-nav ul {
        flex-direction: column;
        padding: 10px 0;
        margin: 0;
    }

    .main-nav li {
        margin: 0;
        padding: 0;
        border-bottom: 1px solid #f0f0f0;
    }

    .main-nav li:last-child {
        border-bottom: none;
    }

    .main-nav a {
        display: block;
        font-size: 14px;
        padding: 12px 20px;
        color: #2c3e50;
        text-decoration: none;
        transition: background-color 0.3s;
    }

    .main-nav a:hover {
        background-color: #f8f9fa;
    }

    /* 调整hero区域的上边距 */
    .hero {
        padding-top: 80px;
    }

    .hero-content h2 {
        font-size: 32px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .version-info {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }

    .version-info span {
        margin: 5px 0;
        width: 100%;
        text-align: center;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }

    .btn {
        margin: 5px 0;
        width: 100%;
        max-width: 280px;
    }

    .hero-image {
        min-height: 200px;
    }

    .main-image {
        max-width: 70%;
    }

    .features-row,
    .advantages-row,
    .guide-row,
    .faq-row,
    .contact-row,
    .download-row {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    .feature-item,
    .advantage-item,
    .guide-item,
    .faq-item,
    .contact-item,
    .download-item {
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
    }

    .section-title {
        font-size: 28px;
        margin-bottom: 40px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 30px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }

    .hero-content h2 {
        font-size: 28px;
    }

    .hero-content p {
        font-size: 15px;
    }

    .section-title {
        font-size: 24px;
        margin-bottom: 30px;
    }

    .feature-item,
    .advantage-item,
    .guide-item,
    .faq-item,
    .contact-item,
    .download-item {
        padding: 20px;
    }

    .feature-icon,
    .advantage-icon,
    .guide-icon,
    .faq-icon,
    .contact-icon,
    .download-icon {
        font-size: 28px;
    }

    .feature-item h3,
    .advantage-item h3,
    .guide-item h3,
    .faq-item h3,
    .contact-item h3,
    .download-item h3 {
        font-size: 16px;
    }

    .feature-item p,
    .advantage-item p,
    .guide-item p,
    .faq-item p,
    .contact-item p,
    .download-item p {
        font-size: 13px;
    }

    .feature-details li,
    .advantage-details li,
    .guide-details li,
    .faq-details li,
    .contact-details li,
    .download-details li {
        font-size: 13px;
    }

    .btn {
        padding: 12px 20px;
        font-size: 14px;
    }

    .header .container {
        height: 45px;
    }

    .logo h1 {
        font-size: 16px;
    }

    .main-nav {
        top: 45px;
    }

    .main-nav li {
        padding: 6px 15px;
    }

    .main-nav a {
        font-size: 13px;
        padding: 10px 15px;
    }

    .menu-toggle {
        width: 20px;
        height: 16px;
    }

    .menu-toggle span:nth-child(2) {
        top: 7px;
    }

    .menu-toggle span:nth-child(3) {
        top: 14px;
    }

    .menu-toggle.active span:nth-child(1) {
        top: 7px;
    }

    .menu-toggle.active span:nth-child(3) {
        top: 7px;
    }
}

/* 确保PC端菜单按钮隐藏 */
@media (min-width: 769px) {
    .menu-toggle {
        display: none;
    }

    .main-nav {
        display: block !important;
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
    }
}

/* 添加平滑滚动效果 */
html {
    scroll-behavior: smooth;
}

/* 优化移动端触摸体验 */
@media (hover: none) {
    .feature-item:hover,
    .advantage-item:hover,
    .guide-item:hover,
    .faq-item:hover,
    .contact-item:hover,
    .download-item:hover {
        transform: none;
    }

    .btn:active {
        transform: scale(0.98);
    }
}

/* 优化高分辨率屏幕显示 */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }

    .hero-content h2 {
        font-size: 54px;
    }

    .section-title {
        font-size: 40px;
    }

    .feature-item,
    .advantage-item,
    .guide-item,
    .faq-item,
    .contact-item,
    .download-item {
        padding: 30px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-item,
.step,
.faq-item {
    animation: fadeIn 0.5s ease-out forwards;
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background-color: #f8f9fa;
    position: relative;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(44, 62, 80, 0.05));
    z-index: 0;
}

.download-framework {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.download-row {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.download-row:last-child {
    margin-bottom: 0;
}

.download-item {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: all 0.3s ease;
    width: calc(33.333% - 14px);
    min-width: 250px;
    position: relative;
    overflow: hidden;
}

.download-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2c3e50);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.download-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

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

.download-icon {
    font-size: 36px;
    margin-bottom: 15px;
    color: #3498db;
}

.download-item h3 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 18px;
}

.download-item p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
    font-size: 14px;
}

.download-details {
    list-style: none;
    margin: 15px 0;
    text-align: left;
}

.download-details li {
    margin: 8px 0;
    padding-left: 20px;
    position: relative;
    color: #555;
    font-size: 14px;
}

.download-details li:before {
    content: "✓";
    color: #2ecc71;
    position: absolute;
    left: 0;
    font-weight: bold;
}

.download-item .btn {
    margin-top: 20px;
    width: 100%;
}

@media (max-width: 992px) {
    .download-row {
        flex-wrap: wrap;
    }
    
    .download-item {
        width: calc(50% - 10px);
        margin-bottom: 20px;
    }
}

@media (max-width: 768px) {
    .download-row {
        flex-direction: column;
        align-items: center;
    }

    .download-item {
        width: 100%;
        max-width: 300px;
        margin: 0 auto 20px;
    }
}

/* 友情链接区域 */
.related-sites {
    padding: 60px 0;
    background-color: #f8f9fa;
}

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

.links-container ul {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    list-style: none;
    padding: 0;
}

.links-container li {
    background: white;
    padding: 10px 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.links-container li:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.links-container a {
    color: #2c3e50;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.links-container a:hover {
    color: #3498db;
}

@media (max-width: 768px) {
    .links-container ul {
        gap: 15px;
    }

    .links-container li {
        padding: 8px 15px;
    }

    .links-container a {
        font-size: 13px;
    }
}

@media (max-width: 576px) {
    .related-sites {
        padding: 40px 0;
    }

    .links-container {
        padding: 15px;
    }

    .links-container ul {
        gap: 10px;
    }

    .links-container li {
        padding: 6px 12px;
    }
}