/* 全局样式重置 */
* {
    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;
}

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

/* 头部样式 */
.header {
    background-color: #00B900;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.logo h1 {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

/* 汉堡菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 5px 0;
    transition: all 0.3s ease;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.main-nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
    padding: 0.5rem 1rem;
    border-radius: 4px;
}

.main-nav a:hover {
    opacity: 0.8;
    background-color: rgba(255, 255, 255, 0.1);
}

/* 主要内容区域 */
main {
    margin-top: 70px;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #00B900, #00A000);
    color: white;
    padding: 6rem 0 4rem;
    text-align: left;
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-text {
    z-index: 2;
}

.hero-text h2 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-text p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-image {
    position: relative;
    z-index: 1;
}

.hero-image img {
    width: 100%;
    max-width: 400px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.floating {
    animation: float 6s ease-in-out infinite;
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s;
    margin: 0 0.5rem;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background-color: white;
    color: #00B900;
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid white;
    color: white;
}

/* 特色功能区域 */
.features {
    padding: 4rem 0;
    background-color: #f9f9f9;
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.feature-card.primary {
    background: linear-gradient(135deg, #00B900, #00A000);
    color: white;
}

.feature-card.primary h3,
.feature-card.primary .feature-icon {
    color: white;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: inline-block;
}

.feature-card h3 {
    color: #00B900;
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.feature-details {
    list-style: none;
    padding: 0;
    margin: 0;
    margin-top: auto;
}

.feature-details li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    color: #555;
}

.feature-details li:before {
    content: "✓";
    color: #00B900;
    position: absolute;
    left: 0;
    font-weight: bold;
}

.feature-card.primary .feature-details li {
    color: rgba(255, 255, 255, 0.9);
}

.feature-card.primary .feature-details li:before {
    color: white;
}

/* 响应式设计优化 */
/* 大屏幕 (1200px以上) */
@media (min-width: 1200px) {
    .features-grid {
        gap: 2.5rem;
    }
    
    .feature-card {
        padding: 2.5rem;
    }
}

/* 中等屏幕 (992px - 1199px) */
@media (max-width: 1199px) {
    .features-grid {
        gap: 2rem;
    }
    
    .feature-card {
        padding: 2rem;
    }
}

/* 平板设备 (768px - 991px) */
@media (max-width: 991px) {
    .menu-toggle {
        display: block;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: #00B900;
        padding: 5rem 2rem 2rem;
        transition: right 0.3s ease;
        box-shadow: -2px 0 5px rgba(0,0,0,0.1);
    }

    .main-nav.active {
        right: 0;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 1rem;
    }

    .main-nav a {
        display: block;
        padding: 1rem;
        text-align: center;
        border-radius: 8px;
        background-color: rgba(255, 255, 255, 0.1);
    }

    .main-nav a:hover {
        background-color: rgba(255, 255, 255, 0.2);
    }

    /* 汉堡菜单动画 */
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

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

    /* 遮罩层 */
    .nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

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

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .feature-card {
        padding: 1.8rem;
    }
    
    .feature-icon {
        font-size: 2.2rem;
    }
    
    .feature-card h3 {
        font-size: 1.3rem;
    }
}

/* 大手机 (576px - 767px) */
@media (max-width: 767px) {
    .features {
        padding: 3rem 0;
    }
    
    .features h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-icon {
        font-size: 2rem;
    }
    
    .feature-card h3 {
        font-size: 1.2rem;
    }
    
    .feature-card p {
        font-size: 0.95rem;
        margin-bottom: 1rem;
    }
    
    .feature-details li {
        font-size: 0.9rem;
        margin-bottom: 0.6rem;
    }
}

/* 小手机 (575px以下) */
@media (max-width: 575px) {
    .logo h1 {
        font-size: 1.2rem;
    }

    .main-nav {
        width: 100%;
        max-width: none;
    }

    .main-nav a {
        font-size: 1rem;
        padding: 0.8rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-icon {
        font-size: 1.8rem;
    }
    
    .feature-card h3 {
        font-size: 1.1rem;
    }
    
    .feature-card p {
        font-size: 0.9rem;
    }
    
    .feature-details li {
        font-size: 0.85rem;
    }
}

/* 指南区域样式 */
.guide {
    padding: 4rem 0;
    background-color: #f9f9f9;
}

.guide h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    color: #333;
}

.guide-layout {
    max-width: 1200px;
    margin: 0 auto;
}

.guide-main {
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    overflow: hidden;
    margin-bottom: 2rem;
}

.guide-requirements {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.guide-steps {
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.guide-step {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.guide-step:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.step-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.step-number {
    width: 35px;
    height: 35px;
    background: linear-gradient(135deg, #00B900, #00A000);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.guide-step h4 {
    color: #333;
    font-size: 1.3rem;
    margin: 0;
}

.guide-step p {
    color: #666;
    margin: 0;
    font-size: 0.95rem;
}

.step-details {
    list-style: none;
    padding: 0;
    margin: 1rem 0 0 0;
    text-align: left;
    width: 100%;
}

.step-details li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    color: #555;
    font-size: 0.9rem;
}

.step-details li:before {
    content: "✓";
    color: #00B900;
    position: absolute;
    left: 0;
    font-weight: bold;
}

.guide-side {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.guide-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    overflow: hidden;
}

.card-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, #00B900, #00A000);
    color: white;
}

.card-header h4 {
    margin: 0;
    font-size: 1.3rem;
}

.card-body {
    padding: 1.5rem;
}

.system-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.system-tab {
    flex: 1;
    padding: 0.8rem;
    border: none;
    background: #f8f9fa;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.system-tab.active {
    background: linear-gradient(135deg, #00B900, #00A000);
    color: white;
}

.tab-icon {
    font-size: 1.2rem;
}

.system-content {
    display: none;
}

.system-content.active {
    display: block;
}

.system-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.system-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    color: #555;
}

.system-list li:before {
    content: "•";
    color: #00B900;
    position: absolute;
    left: 0;
}

.tips-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.tips-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 8px;
    margin-bottom: 1rem;
}

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

.tip-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.tips-list p {
    margin: 0;
    color: #555;
}

/* 响应式设计 */
@media (max-width: 991px) {
    .guide-requirements {
        grid-template-columns: 1fr;
        max-width: 800px;
    }

    .guide-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .guide-steps {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .guide-step {
        padding: 1.5rem;
    }

    .step-icon {
        font-size: 2rem;
    }

    .step-number {
        width: 30px;
        height: 30px;
        font-size: 1rem;
    }

    .guide-step h4 {
        font-size: 1.2rem;
    }

    .guide-step p {
        font-size: 0.9rem;
    }

    .step-details li {
        font-size: 0.85rem;
    }
}

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

.guide-step {
    animation: slideIn 0.5s ease-out forwards;
    animation-delay: calc(var(--animation-order) * 0.1s);
}

.system-content {
    animation: fadeIn 0.3s ease-out forwards;
}

/* 页脚样式 */
.footer {
    background-color: #333;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* 版本信息样式 */
.version-info {
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.version-info p {
    margin: 0.5rem 0;
}

/* 版本说明区域 */
.version {
    padding: 4rem 0;
    background-color: #f5f5f5;
}

.version h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    color: #333;
}

.version-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.version-card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
}

.version-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.version-card.primary {
    background: linear-gradient(135deg, #00B900, #00A000);
    color: white;
}

.version-header {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.version-card.primary .version-header {
    border-bottom-color: rgba(255,255,255,0.2);
}

.version-icon {
    font-size: 2rem;
}

.version-header h3 {
    margin: 0;
    font-size: 1.4rem;
    color: #333;
}

.version-card.primary .version-header h3 {
    color: white;
}

.version-tag {
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-left: auto;
}

.version-content {
    padding: 1.5rem;
}

.version-info {
    margin-bottom: 1.5rem;
}

.version-number,
.version-date {
    margin: 0.5rem 0;
    color: #666;
}

.version-card.primary .version-number,
.version-card.primary .version-date {
    color: rgba(255,255,255,0.9);
}

.version-features {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
}

.version-features li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.8rem;
    color: #555;
}

.version-features li:before {
    content: "✓";
    color: #00B900;
    position: absolute;
    left: 0;
    font-weight: bold;
}

.version-card.primary .version-features li {
    color: rgba(255,255,255,0.9);
}

.version-card.primary .version-features li:before {
    color: white;
}

.version-requirements {
    background: rgba(0,0,0,0.03);
    padding: 1rem;
    border-radius: 10px;
}

.version-card.primary .version-requirements {
    background: rgba(255,255,255,0.1);
}

.version-requirements h4 {
    margin: 0 0 1rem 0;
    color: #333;
    font-size: 1.1rem;
}

.version-card.primary .version-requirements h4 {
    color: white;
}

.version-requirements ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.version-requirements li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: #666;
    font-size: 0.95rem;
}

.version-requirements li:before {
    content: "•";
    color: #00B900;
    position: absolute;
    left: 0;
}

.version-card.primary .version-requirements li {
    color: rgba(255,255,255,0.9);
}

.version-card.primary .version-requirements li:before {
    color: white;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .version-grid {
        gap: 1.5rem;
    }
}

@media (max-width: 991px) {
    .version-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .version {
        padding: 3rem 0;
    }

    .version h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }

    .version-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .version-header {
        padding: 1.2rem;
    }

    .version-content {
        padding: 1.2rem;
    }

    .version-icon {
        font-size: 1.8rem;
    }

    .version-header h3 {
        font-size: 1.2rem;
    }

    .version-features li,
    .version-requirements li {
        font-size: 0.9rem;
    }
}

/* 系统要求样式 */
.system-requirements {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
}

.system-requirements h3 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.requirement-item {
    background: #f9f9f9;
    padding: 1.5rem;
    border-radius: 8px;
}

.requirement-item h4 {
    color: #00B900;
    margin-bottom: 1rem;
}

.requirement-item ul {
    list-style: none;
    padding-left: 1rem;
}

.requirement-item ul li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.5rem;
}

.requirement-item ul li:before {
    content: "✓";
    color: #00B900;
    position: absolute;
    left: 0;
}

/* 更新下载按钮样式 */
.download-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

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

.feature-card {
    animation: fadeIn 0.5s ease-out forwards;
    animation-delay: calc(var(--animation-order) * 0.1s);
}

.version-card {
    animation: fadeIn 0.5s ease-out forwards;
    animation-delay: calc(var(--animation-order) * 0.1s);
}

/* 指南区域响应式设计 */
/* 大屏幕 (1200px以上) */
@media (min-width: 1200px) {
    .guide-wrapper {
        gap: 2.5rem;
    }

    .guide-main,
    .guide-side {
        padding: 2.5rem;
    }

    .step-card {
        padding: 2rem;
    }

    .step-content h3 {
        font-size: 1.4rem;
    }
}

/* 中等屏幕 (992px - 1199px) */
@media (max-width: 1199px) {
    .guide-wrapper {
        gap: 2rem;
    }

    .guide-main,
    .guide-side {
        padding: 2rem;
    }

    .step-card {
        padding: 1.8rem;
    }
}

/* 平板设备 (768px - 991px) */
@media (max-width: 991px) {
    .guide-wrapper {
        grid-template-columns: 1fr;
        max-width: 800px;
        margin: 0 auto;
    }

    .guide-main,
    .guide-side {
        padding: 1.8rem;
    }

    .guide-steps {
        gap: 1.5rem;
    }

    .step-card {
        padding: 1.5rem;
    }

    .requirements-tabs {
        flex-wrap: wrap;
    }

    .tab {
        flex: 1;
        min-width: 200px;
        justify-content: center;
    }
}

/* 大手机 (576px - 767px) */
@media (max-width: 767px) {
    .guide {
        padding: 2.5rem 0;
    }

    .guide h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }

    .guide-main,
    .guide-side {
        padding: 1.5rem;
    }

    .guide-steps {
        gap: 1.2rem;
    }

    .step-card {
        flex-direction: column;
        gap: 1rem;
        padding: 1.2rem;
    }

    .step-number {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }

    .step-content h3 {
        font-size: 1.2rem;
    }

    .step-content p {
        font-size: 0.95rem;
    }

    .step-details li {
        font-size: 0.9rem;
    }

    .requirements-tabs {
        flex-direction: column;
        gap: 0.8rem;
    }

    .tab {
        width: 100%;
        padding: 0.8rem;
    }

    .requirement-card {
        padding: 1.2rem;
    }

    .requirement-card h4 {
        font-size: 1.1rem;
    }

    .requirement-card li {
        font-size: 0.9rem;
    }

    .tips-list li {
        padding: 0.8rem;
    }

    .tip-icon {
        font-size: 1.3rem;
    }

    .tips-list p {
        font-size: 0.9rem;
    }
}

/* 小手机 (575px以下) */
@media (max-width: 575px) {
    .guide {
        padding: 2rem 0;
    }

    .guide h2 {
        font-size: 1.6rem;
        margin-bottom: 1.5rem;
    }

    .guide-main,
    .guide-side {
        padding: 1.2rem;
    }

    .guide-steps {
        gap: 1rem;
    }

    .step-card {
        padding: 1rem;
    }

    .step-number {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
    }

    .step-content h3 {
        font-size: 1.1rem;
    }

    .step-content p {
        font-size: 0.9rem;
        margin-bottom: 0.8rem;
    }

    .step-details li {
        font-size: 0.85rem;
        margin-bottom: 0.4rem;
    }

    .system-requirements h3,
    .guide-tips h3 {
        font-size: 1.2rem;
        margin-bottom: 1.2rem;
    }

    .tab {
        padding: 0.7rem;
        font-size: 0.9rem;
    }

    .tab-icon {
        font-size: 1.1rem;
    }

    .requirement-card {
        padding: 1rem;
    }

    .requirement-card h4 {
        font-size: 1rem;
        margin-bottom: 0.8rem;
    }

    .requirement-card li {
        font-size: 0.85rem;
        margin-bottom: 0.4rem;
    }

    .tips-list li {
        padding: 0.7rem;
        margin-bottom: 0.8rem;
    }

    .tip-icon {
        font-size: 1.2rem;
    }

    .tips-list p {
        font-size: 0.85rem;
    }
}

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

.step-card {
    animation: slideIn 0.5s ease-out forwards;
    animation-delay: calc(var(--animation-order) * 0.1s);
}

.tab-content {
    animation: fadeIn 0.3s ease-out forwards;
}

/* 交互效果 */
.tab {
    position: relative;
    overflow: hidden;
}

.tab::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: #00B900;
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.tab:hover::after {
    transform: scaleX(1);
}

.tab.active::after {
    transform: scaleX(1);
}

.step-card {
    position: relative;
    overflow: hidden;
}

.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(135deg, #00B900, #00A000);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.step-card:hover::before {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 991px) {
    .header .container {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-text h2 {
        font-size: 2.5rem;
    }

    .hero-image {
        order: -1;
    }

    .hero-image img {
        max-width: 300px;
        margin: 0 auto;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .version-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .guide-steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .guide-requirements {
        grid-template-columns: 1fr;
    }
}

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

    .hero {
        padding: 4rem 0 2rem;
    }

    .hero-text h2 {
        font-size: 2rem;
    }

    .hero-text p {
        font-size: 1.1rem;
    }

    .hero-image img {
        max-width: 250px;
    }

    .download-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .version-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .guide-steps {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .system-tabs {
        flex-direction: column;
        gap: 0.5rem;
    }

    .system-tab {
        width: 100%;
    }
}

@media (max-width: 575px) {
    .header {
        padding: 0.8rem 0;
    }

    .logo h1 {
        font-size: 1.2rem;
    }

    .main-nav ul {
        gap: 0.5rem;
    }

    .main-nav a {
        font-size: 0.9rem;
        padding: 0.5rem;
    }

    .hero {
        padding: 3rem 0 2rem;
    }

    .hero-text h2 {
        font-size: 1.8rem;
    }

    .hero-text p {
        font-size: 1rem;
    }

    .hero-image img {
        max-width: 200px;
    }

    .version-info {
        font-size: 0.9rem;
    }

    .features h2,
    .version h2,
    .guide h2 {
        font-size: 1.6rem;
        margin-bottom: 1.5rem;
    }

    .feature-card,
    .version-card,
    .guide-card {
        padding: 1.2rem;
    }

    .feature-icon,
    .version-icon,
    .step-icon {
        font-size: 1.8rem;
    }

    .feature-card h3,
    .version-header h3,
    .guide-step h4 {
        font-size: 1.1rem;
    }

    .feature-card p,
    .version-content p,
    .guide-step p {
        font-size: 0.9rem;
    }

    .feature-details li,
    .version-features li,
    .step-details li {
        font-size: 0.85rem;
    }

    .tips-list li {
        padding: 0.8rem;
    }

    .tip-icon {
        font-size: 1.2rem;
    }

    .tips-list p {
        font-size: 0.85rem;
    }
}

/* 大屏幕优化 */
@media (min-width: 1200px) {
    .container {
        max-width: 1400px;
    }

    .hero-content {
        gap: 4rem;
    }

    .hero-text h2 {
        font-size: 3.5rem;
    }

    .hero-text p {
        font-size: 1.4rem;
    }

    .hero-image img {
        max-width: 450px;
    }

    .features-grid,
    .version-grid {
        gap: 2.5rem;
    }

    .feature-card,
    .version-card {
        padding: 2.5rem;
    }

    .guide-steps {
        gap: 2rem;
    }

    .guide-step {
        padding: 2rem;
    }
}

/* 动画优化 */
@media (prefers-reduced-motion: reduce) {
    .floating,
    .feature-card,
    .version-card,
    .guide-step {
        animation: none;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #1a1a1a;
        color: #fff;
    }

    .feature-card,
    .version-card,
    .guide-card {
        background-color: #2d2d2d;
        box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    }

    .feature-card p,
    .version-content p,
    .guide-step p {
        color: #ccc;
    }

    .feature-details li,
    .version-features li,
    .step-details li {
        color: #ddd;
    }

    .system-tab {
        background-color: #333;
        color: #fff;
    }

    .tips-list li {
        background-color: #333;
    }
}

/* 下载中心样式 */
.download {
    padding: 4rem 0;
    background-color: #f9f9f9;
}

.download h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    color: #333;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.download-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.download-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.download-card h3 {
    color: #333;
    font-size: 1.4rem;
    margin: 0;
}

.download-card p {
    color: #666;
    margin: 0;
    font-size: 0.95rem;
}

.download-info {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    width: 100%;
}

.download-info p {
    margin: 0.3rem 0;
    color: #555;
    font-size: 0.9rem;
}

.download-card .btn {
    width: 100%;
    margin-top: auto;
}

/* 下载中心响应式设计 */
@media (max-width: 1200px) {
    .download-grid {
        gap: 1.5rem;
    }
}

@media (max-width: 991px) {
    .download-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 800px;
    }
}

@media (max-width: 768px) {
    .download {
        padding: 3rem 0;
    }

    .download h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }

    .download-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .download-card {
        padding: 1.5rem;
    }

    .download-icon {
        font-size: 2.5rem;
    }

    .download-card h3 {
        font-size: 1.2rem;
    }

    .download-card p {
        font-size: 0.9rem;
    }

    .download-info {
        padding: 0.8rem;
    }

    .download-info p {
        font-size: 0.85rem;
    }
}

@media (max-width: 575px) {
    .download {
        padding: 2rem 0;
    }

    .download h2 {
        font-size: 1.6rem;
        margin-bottom: 1.5rem;
    }

    .download-card {
        padding: 1.2rem;
    }

    .download-icon {
        font-size: 2rem;
    }

    .download-card h3 {
        font-size: 1.1rem;
    }

    .download-info {
        padding: 0.7rem;
    }
}

/* 友情链接样式 */
.friend-links {
    margin: 2rem 0;
    padding: 1rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.friend-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.friend-links li {
    margin: 0;
}

.friend-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.friend-links a:hover {
    color: white;
    background-color: rgba(255, 255, 255, 0.1);
}

/* 友情链接响应式设计 */
@media (max-width: 768px) {
    .friend-links ul {
        gap: 0.5rem;
    }

    .friend-links a {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 575px) {
    .friend-links {
        margin: 1.5rem 0;
    }

    .friend-links ul {
        flex-direction: column;
        align-items: center;
    }

    .friend-links a {
        display: block;
        width: 100%;
        text-align: center;
    }
}