:root {
    --primary: #2B3A67;
    --secondary: #14B8A6;
    --accent: #F59E0B;
    --dark: #1F2937;
    --light: #F9FAFB;
    --white: #FFFFFF;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    line-height: 1.5;
    color: var(--dark);
    background: var(--light);
}

.zcd275container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4 {
    margin-bottom: 1rem;
}

h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.zcd275section-desc {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 2rem;
    color: #4B5563;
}

/* 头部样式 */
.zcd275site-header {
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    background: var(--white);
    box-shadow: var(--shadow);
}

.zcd275top-bar {
    background: var(--primary);
    color: var(--white);
    padding: 6px 0;
}

.zcd275top-notice {
    color: var(--white);
    font-size: 14px;
    text-align: center;
    display: block;
}

.zcd275main-nav {
    padding: 12px 0;
}

.zcd275main-nav .zcd275container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    color: var(--primary);
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
}

.zcd275nav-list {
    display: flex;
    gap: 30px;
    list-style: none;
}

.zcd275nav-list a {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.zcd275nav-list a:hover {
    color: var(--accent);
}

/* 英雄区域 */
.zcd275hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.zcd275hero .zcd275container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.zcd275hero-content {
    flex: 1;
    max-width: 600px;
}

.zcd275hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.zcd275hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.zcd275hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.zcd275hero-desc {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.zcd275quick-download {
    margin: 30px 0;
    display: flex;
    gap: 20px;
    justify-content: center;
}

.zcd275quick-btn {
    padding: 12px 30px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.zcd275quick-btn.zcd275android {
    background: var(--accent);
    color: var(--white);
}

.zcd275quick-btn.zcd275ios {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

.zcd275quick-btn.zcd275register {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.zcd275quick-btn.zcd275register::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #00c6ff, #0072ff);
    opacity: 0;
    z-index: -1;
    transition: opacity 0.3s ease;
}

.zcd275quick-btn.zcd275register:hover {
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 114, 255, 0.2);
}

.zcd275quick-btn.zcd275register:hover::before {
    opacity: 1;
}

.zcd275quick-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.zcd275hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 3rem;
}

.zcd275stat-item {
    text-align: center;
}

.zcd275stat-item strong {
    display: block;
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

/* 版本选择区域 */
.zcd275versions {
    padding: 6rem 0;
    background: var(--white);
}

.zcd275version-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.zcd275version-card {
    background: var(--light);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    transition: transform 0.3s;
}

.zcd275version-card:hover {
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    h2 {
        font-size: 1.75rem;
    }

    .zcd275menu-toggle {
        display: block;
        width: 24px;
        height: 18px;
        position: relative;
        background: none;
        border: none;
        cursor: pointer;
    }

    .zcd275menu-toggle span {
        display: block;
        width: 100%;
        height: 2px;
        background: var(--dark);
        position: absolute;
        left: 0;
        top: 8px;
        transition: all 0.3s;
    }

    .zcd275menu-toggle::before,
    .zcd275menu-toggle::after {
        content: '';
        position: absolute;
        width: 100%;
        height: 2px;
        background: var(--dark);
        left: 0;
        transition: all 0.3s;
    }

    .zcd275menu-toggle::before {
        top: 0;
    }

    .zcd275menu-toggle::after {
        bottom: 0;
    }

    .zcd275menu-toggle.zcd275active span {
        opacity: 0;
    }

    .zcd275menu-toggle.zcd275active::before {
        transform: rotate(45deg);
        top: 8px;
    }

    .zcd275menu-toggle.zcd275active::after {
        transform: rotate(-45deg);
        bottom: 8px;
    }

    .zcd275nav-list {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        padding: 0;
        flex-direction: column;
        gap: 0;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .zcd275nav-list.zcd275active {
        display: flex;
    }

    .zcd275nav-list li {
        width: 100%;
    }

    .zcd275nav-list a {
        display: block;
        padding: 15px 20px;
        border-bottom: 1px solid var(--light);
    }

    .zcd275hero .zcd275container {
        flex-direction: column;
        text-align: center;
    }
    
    .zcd275hero-content {
        max-width: 100%;
    }
    
    .zcd275hero-image {
        margin-top: 30px;
    }

    .zcd275hero h1 {
        font-size: 2rem;
    }

    .zcd275hero-desc {
        font-size: 1rem;
    }

    .zcd275quick-download {
        flex-direction: column;
        gap: 15px;
    }

    .zcd275quick-btn {
        width: 100%;
        text-align: center;
        padding: 12px 20px;
    }

    .zcd275hero-stats {
        grid-template-columns: 1fr;
    }

    .zcd275download-cards,
    .zcd275features-grid,
    .zcd275guide-steps,
    .zcd275security-grid,
    .zcd275footer-grid {
        grid-template-columns: 1fr;
    }

    .zcd275footer-col h4::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .zcd275footer-col {
        text-align: center;
    }

    .zcd275quick-btn.zcd275register {
        border-width: 1px;
        font-size: 14px;
    }
}

/* 下载区域样式 */
.zcd275download-section {
    padding: 4rem 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: var(--white);
}

.zcd275download-framework {
    max-width: 1000px;
    margin: 0 auto;
}

.zcd275framework-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.zcd275download-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.zcd275download-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
}

.zcd275card-header {
    padding: 1.5rem;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.zcd275platform-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--accent);
}

.zcd275card-header h3 {
    margin: 0;
    color: var(--white);
    font-size: 1.25rem;
}

.zcd275card-body {
    padding: 1.5rem;
}

.zcd275version-info {
    text-align: center;
    margin-bottom: 1.5rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
}

.zcd275version-number {
    display: block;
    font-weight: bold;
    color: var(--white);
    margin-bottom: 0.25rem;
}

.zcd275version-label {
    display: block;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

.zcd275version-features {
    list-style: none;
    margin: 0 0 1.5rem;
    padding: 0;
}

.zcd275version-features li {
    color: rgba(255, 255, 255, 0.9);
    padding: 0.5rem 0;
    text-align: center;
    font-size: 0.95rem;
}

.zcd275download-actions {
    text-align: center;
}

.zcd275download-btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--accent);
    color: var(--white);
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s;
}

.zcd275download-btn:hover {
    background: #e08c00;
    transform: translateY(-2px);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .zcd275download-section {
        padding: 3rem 0;
    }

    .zcd275framework-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .zcd275card-header {
        padding: 1.25rem;
    }

    .zcd275platform-icon {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
        margin-bottom: 0.5rem;
    }

    .zcd275card-body {
        padding: 1.25rem;
    }

    .zcd275version-features li {
        font-size: 0.9rem;
    }

    .zcd275download-btn {
        padding: 0.625rem 1.75rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .zcd275framework-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 特色功能区域 */
.zcd275features-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: var(--white);
}

.zcd275features-framework {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.zcd275features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.zcd275feature-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.zcd275feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.zcd275feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--accent);
}

.zcd275feature-content {
    text-align: center;
}

.zcd275feature-content h3 {
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.zcd275feature-content p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.zcd275feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
}

.zcd275feature-list li {
    color: rgba(255, 255, 255, 0.9);
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.zcd275feature-list li::before {
    content: "✓";
    color: var(--accent);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .zcd275features-section {
        padding: 4rem 0;
    }

    .zcd275features-framework {
        padding: 1rem;
    }

    .zcd275features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .zcd275feature-card {
        padding: 1.5rem;
    }

    .zcd275feature-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }

    .zcd275feature-content h3 {
        font-size: 1.25rem;
    }

    .zcd275feature-content p {
        font-size: 0.9rem;
    }

    .zcd275feature-list li {
        font-size: 0.9rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .zcd275features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 安装教程区域 */
.zcd275guide-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: var(--white);
}

.zcd275guide-framework {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

.zcd275guide-timeline {
    position: relative;
    padding: 2rem 0;
}

.zcd275guide-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
}

.zcd275guide-step {
    position: relative;
    margin-bottom: 3rem;
    display: flex;
    align-items: flex-start;
}

.zcd275guide-step:last-child {
    margin-bottom: 0;
}

.zcd275step-number {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--white);
    z-index: 1;
}

.zcd275step-content {
    width: calc(50% - 40px);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.zcd275guide-step:nth-child(odd) .zcd275step-content {
    margin-right: auto;
}

.zcd275guide-step:nth-child(even) .zcd275step-content {
    margin-left: auto;
}

.zcd275step-content:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.zcd275step-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.zcd275step-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--white);
}

.zcd275step-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 1.25rem;
}

.zcd275step-body p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.zcd275step-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.zcd275feature-tag {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .zcd275guide-section {
        padding: 4rem 0;
    }

    .zcd275guide-framework {
        padding: 1rem;
    }

    .zcd275guide-timeline::before {
        left: 20px;
    }

    .zcd275guide-step {
        margin-bottom: 2rem;
    }

    .zcd275step-number {
        left: 20px;
        transform: none;
    }

    .zcd275step-content {
        width: calc(100% - 60px);
        margin-left: 60px !important;
    }

    .zcd275step-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .zcd275step-icon {
        position: absolute;
        top: 1.5rem;
        right: 1.5rem;
    }

    .zcd275step-features {
        justify-content: flex-start;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .zcd275guide-timeline::before {
        left: 30px;
    }

    .zcd275step-number {
        left: 30px;
        transform: none;
    }

    .zcd275step-content {
        width: calc(100% - 70px);
        margin-left: 70px !important;
    }
}

/* 安全保障区域 */
.zcd275security-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: var(--white);
}

.zcd275security-framework {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.zcd275security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.zcd275security-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.zcd275security-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.zcd275security-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--accent);
}

.zcd275security-content {
    text-align: center;
}

.zcd275security-content h3 {
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.zcd275security-content p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.zcd275security-features {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    text-align: left;
}

.zcd275feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: rgba(255, 255, 255, 0.9);
}

.zcd275feature-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .zcd275security-section {
        padding: 4rem 0;
    }

    .zcd275security-framework {
        padding: 1rem;
    }

    .zcd275security-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .zcd275security-card {
        padding: 1.5rem;
    }

    .zcd275security-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }

    .zcd275security-content h3 {
        font-size: 1.25rem;
    }

    .zcd275security-content p {
        font-size: 0.9rem;
    }

    .zcd275feature-item {
        font-size: 0.9rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .zcd275security-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 页脚样式 */
.zcd275site-footer {
    background: var(--primary);
    color: var(--white);
    padding: 60px 0 30px;
}

.zcd275footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.zcd275footer-col h4 {
    color: var(--white);
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.zcd275footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent);
}

.zcd275footer-col ul {
    list-style: none;
}

.zcd275footer-col ul li {
    margin-bottom: 0.75rem;
}

.zcd275footer-col ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s;
}

.zcd275footer-col ul li a:hover {
    color: var(--white);
    padding-left: 5px;
}

.zcd275related-links {
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 20px;
}

.zcd275copyright {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* 广告区域样式 */
.zcd275ad-section {
    padding: 40px 0;
    background: var(--background);
}

.zcd275ad-section .zcd275container {
    text-align: center;
}

/* 友情链接和相关站点样式 */
.zcd275related-links {
    padding: 40px 0;
    background: var(--section-bg);
}

.zcd275friend-links {
    margin-bottom: 30px;
}

.zcd275related-sites ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

.zcd275related-sites li a {
    color: var(--text-color);
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 4px;
    background: var(--background);
    transition: var(--transition);
}

.zcd275related-sites li a:hover {
    color: var(--secondary-color);
    box-shadow: var(--card-shadow);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .zcd275related-sites ul {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
}

/* 底部导航样式 */
.zcd275footer-nav {
    padding: 80px 0;
    background: var(--primary-color);
    color: var(--light-text);
}

.zcd275footer-nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
}

.zcd275footer-nav-column h4 {
    color: var(--light-text);
    font-size: 18px;
    margin-bottom: 20px;
    font-weight: 600;
}

.zcd275footer-nav-column ul {
    list-style: none;
}

.zcd275footer-nav-column ul li {
    margin-bottom: 12px;
}

.zcd275footer-nav-column ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.zcd275footer-nav-column ul li a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

/* 调整页脚样式 */
.zcd275site-footer {
    background: #162b33; /* 稍深一点的背景色 */
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .zcd275footer-nav {
        padding: 40px 0;
    }

    .zcd275footer-nav-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }

    .zcd275footer-nav-column {
        text-align: center;
    }

    .zcd275footer-nav-column h4 {
        font-size: 16px;
    }

    .zcd275footer-nav-column ul li a {
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .zcd275footer-nav-grid {
        grid-template-columns: 1fr;
    }
}

/* PC端导航样式（1200px以上） */
@media screen and (min-width: 1201px) {
    .zcd275container {
        max-width: 1200px;
        padding: 0 20px;
    }

    .zcd275nav-toggle {
        display: none;
    }

    .zcd275nav-menu {
        display: flex !important;
        gap: 30px;
    }
}

/* 平板端适配（768px - 1200px） */
@media screen and (max-width: 1200px) {
    .zcd275container {
        max-width: 100%;
        padding: 0 30px;
    }

    .zcd275banner-content h1 {
        font-size: 40px;
    }

    .zcd275features-grid,
    .zcd275download-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 移动端适配（768px以下） */
@media screen and (max-width: 768px) {
    .zcd275main-nav {
        padding: 8px 0;
    }

    .zcd275main-nav .zcd275container {
        padding: 0 15px;
    }

    .logo a {
        font-size: 20px;
    }

    .zcd275menu-toggle {
        width: 24px;
        height: 20px;
    }

    .zcd275nav-list {
        padding: 10px 0;
    }

    .zcd275nav-list a {
        padding: 12px 20px;
        font-size: 15px;
    }

    .zcd275hero {
        padding: 100px 0 60px;
    }

    .zcd275hero h1 {
        font-size: 28px;
        margin-bottom: 1rem;
    }

    .zcd275hero-desc {
        font-size: 16px;
        margin-bottom: 1.5rem;
    }

    .zcd275quick-download {
        flex-direction: column;
        gap: 15px;
    }

    .zcd275quick-btn {
        width: 100%;
        text-align: center;
        padding: 12px 20px;
    }

    .zcd275hero-stats {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 2rem;
    }

    .zcd275download-section {
        padding: 3rem 0;
    }

    .zcd275download-framework {
        padding: 0 15px;
    }

    .zcd275framework-content {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .zcd275download-card {
        margin: 0;
    }

    .zcd275card-header {
        padding: 1.25rem;
    }

    .zcd275platform-icon {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }

    .zcd275card-body {
        padding: 1.25rem;
    }

    .zcd275version-info {
        padding: 0.75rem;
    }

    .zcd275version-features li {
        font-size: 14px;
        padding: 0.4rem 0;
    }

    .zcd275download-btn {
        width: 100%;
        padding: 12px 20px;
        font-size: 15px;
    }

    .zcd275features-section {
        padding: 3rem 0;
    }

    .zcd275features-framework {
        padding: 0 15px;
    }

    .zcd275features-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .zcd275feature-card {
        padding: 1.5rem;
    }

    .zcd275feature-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }

    .zcd275feature-content h3 {
        font-size: 18px;
    }

    .zcd275feature-content p {
        font-size: 14px;
    }

    .zcd275feature-list li {
        font-size: 14px;
        padding: 0.4rem 0;
    }

    .zcd275guide-section {
        padding: 3rem 0;
    }

    .zcd275guide-simple-steps {
        flex-direction: column;
        gap: 1.25rem;
        padding: 0 15px;
    }

    .zcd275guide-simple-step {
        max-width: 100%;
        min-width: 0;
        padding: 1.25rem 1rem;
    }

    .zcd275step-num {
        width: 32px;
        height: 32px;
        font-size: 1.1rem;
    }

    .zcd275step-title {
        font-size: 16px;
    }

    .zcd275step-desc {
        font-size: 14px;
    }

    .zcd275security-section {
        padding: 3rem 0;
    }

    .zcd275security-framework {
        padding: 0 15px;
    }

    .zcd275security-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .zcd275security-card {
        padding: 1.5rem;
    }

    .zcd275security-icon {
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }

    .zcd275security-content h3 {
        font-size: 18px;
    }

    .zcd275security-content p {
        font-size: 14px;
    }

    .zcd275feature-item {
        font-size: 14px;
    }

    .zcd275site-footer {
        padding: 40px 0 20px;
    }

    .zcd275footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }

    .zcd275footer-col h4 {
        margin-bottom: 1rem;
    }

    .zcd275footer-col h4::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .zcd275footer-col ul li {
        margin-bottom: 0.5rem;
    }

    .zcd275footer-col ul li a {
        font-size: 14px;
    }

    .zcd275copyright {
        font-size: 13px;
        margin-top: 20px;
    }
}

/* 超小屏幕优化 */
@media screen and (max-width: 360px) {
    .zcd275container {
        padding: 0 12px;
    }

    .zcd275banner-content h1 {
        font-size: 24px;
    }

    .zcd275intro-text {
        font-size: 14px;
    }

    .zcd275btn-primary, .zcd275btn-outline {
        padding: 10px 15px;
        font-size: 14px;
    }

    .zcd275download-card,
    .zcd275feature-card,
    .zcd275security-card,
    .zcd275guide-simple-step {
        padding: 1rem;
    }

    .zcd275card-header h3,
    .zcd275feature-content h3,
    .zcd275security-content h3 {
        font-size: 16px;
    }

    .zcd275version-features li,
    .zcd275feature-list li,
    .zcd275feature-item {
        font-size: 13px;
    }
}

/* 按钮样式 */
.zcd275btn-download,
.zcd275btn-guide {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.zcd275btn-download {
    background: var(--accent);
    color: var(--white);
}

.zcd275btn-guide {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

/* 简洁版安装教程样式 */
.zcd275guide-simple-steps {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 2.5rem 0 0 0;
    flex-wrap: wrap;
}

.zcd275guide-simple-step {
    background: rgba(255,255,255,0.08);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    min-width: 220px;
    max-width: 320px;
    flex: 1 1 220px;
    display: flex;
    align-items: flex-start;
    gap: 1.25rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border: 1px solid rgba(255,255,255,0.10);
    transition: background 0.2s, transform 0.2s;
}

.zcd275guide-simple-step:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-4px);
}

.zcd275step-num {
    width: 36px;
    height: 36px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: bold;
    flex-shrink: 0;
    margin-top: 2px;
}

.zcd275step-info {
    flex: 1;
}

.zcd275step-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--white);
}

.zcd275step-desc {
    color: rgba(255,255,255,0.85);
    font-size: 0.98rem;
    line-height: 1.6;
}

@media (max-width: 900px) {
    .zcd275guide-simple-steps {
        flex-direction: column;
        align-items: stretch;
        gap: 1.25rem;
    }
    .zcd275guide-simple-step {
        max-width: 100%;
        min-width: 0;
        padding: 1.25rem 1rem;
    }
}