/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.z3c042container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* 大屏幕优化 */
@media (min-width: 1400px) {
    .z3c042container {
        max-width: 1320px;
        padding: 0 40px;
    }
}

/* 头部导航 */
.z3c042header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .z3c042header {
        position: relative;
    }
}

.z3c042header .z3c042container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.z3c042logo_text {
    font-size: 1.8rem;
    font-weight: bold;
    color: #fff;
    white-space: nowrap;
}

@media (max-width: 480px) {
    .z3c042logo_text {
        font-size: 1.3rem;
    }
}

.z3c042nav_list {
    display: flex;
    list-style: none;
    gap: 2rem;
    flex-wrap: wrap;
}

@media (max-width: 1024px) {
    .z3c042nav_list {
        gap: 1.5rem;
    }
}

.z3c042nav_link {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    display: flex;
    align-items: center;
    min-height: 44px;
}

.z3c042nav_link:hover {
    background-color: rgba(255, 255, 255, 0.2);
    opacity: 0.9;
}

.z3c042menu_checkbox {
    display: none;
}

.z3c042mobile_menu {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
    padding: 8px;
    z-index: 1001;
    position: relative;
}

.z3c042menu_icon {
    width: 25px;
    height: 3px;
    background-color: #fff;
    border-radius: 3px;
    transition: all 0.3s ease;
}

.z3c042menu_checkbox:checked ~ .z3c042mobile_menu .z3c042menu_icon:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.z3c042menu_checkbox:checked ~ .z3c042mobile_menu .z3c042menu_icon:nth-child(2) {
    opacity: 0;
}

.z3c042menu_checkbox:checked ~ .z3c042mobile_menu .z3c042menu_icon:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* 主横幅区域 */
.z3c042hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 80px 0;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

@media (max-width: 1024px) {
    .z3c042hero {
        padding: 60px 0;
        min-height: 500px;
    }
}

.z3c042hero .z3c042container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

@media (max-width: 1024px) {
    .z3c042hero .z3c042container {
        gap: 40px;
    }
}

.z3c042hero_title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.z3c042hero_subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.z3c042hero_desc {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.8;
    line-height: 1.8;
}

.z3c042hero_buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.z3c042btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    min-height: 44px;
    text-align: center;
}

.z3c042btn_primary {
    background-color: #fff;
    color: #667eea;
}

.z3c042btn_primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.z3c042btn_secondary {
    background-color: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.z3c042btn_secondary:hover {
    background-color: #fff;
    color: #667eea;
}

.z3c042hero_image {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: float 3s ease-in-out infinite;
    width: 100%;
}

@media (prefers-reduced-motion: reduce) {
    .z3c042hero_image {
        animation: none;
    }
}

@media (max-width: 768px) {
    .z3c042hero_image {
        order: -1;
        margin-bottom: 20px;
    }
}

.z3c042hero_img {
    max-width: 100%;
    width: 100%;
    height: auto;
    max-height: 500px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    object-fit: contain;
    display: block;
}

@media (max-width: 1024px) {
    .z3c042hero_img {
        max-height: 450px;
    }
}

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

/* 下载中心 */
.z3c042download {
    padding: 80px 0;
    background-color: #fff;
}

.z3c042section_title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
    font-weight: bold;
}

.z3c042section_desc {
    text-align: center;
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 3rem;
}

.z3c042download_grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 3rem;
}

@media (min-width: 1024px) and (max-width: 1199px) {
    .z3c042download_grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.z3c042download_card {
    background: #fff;
    border: 2px solid #e0e0e0;
    border-radius: 15px;
    padding: 40px 30px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.z3c042download_card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
}

@media (hover: none) {
    .z3c042download_card:hover {
        transform: none;
    }
    
    .z3c042download_card:active {
        transform: translateY(-5px);
    }
}

.z3c042download_icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.z3c042icon_android::before {
    content: "📱";
}

.z3c042icon_ios::before {
    content: "🍎";
}

.z3c042icon_pc::before {
    content: "💻";
}

.z3c042download_title {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

.z3c042download_desc {
    color: #666;
    margin-bottom: 20px;
}

.z3c042download_info {
    display: flex;
    justify-content: space-around;
    margin-bottom: 25px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    flex-wrap: wrap;
    gap: 10px;
}

.z3c042version,
.z3c042size {
    font-size: 0.9rem;
    color: #666;
}

.z3c042btn_download {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    width: 100%;
    padding: 12px;
}

.z3c042btn_download:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* 功能特色 */
.z3c042features {
    padding: 80px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.z3c042features_grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 3rem;
}

.z3c042feature_item {
    background: #fff;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.z3c042feature_item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

@media (hover: none) {
    .z3c042feature_item:hover {
        transform: none;
    }
    
    .z3c042feature_item:active {
        transform: translateY(-5px);
    }
}

.z3c042feature_icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.z3c042icon_chat::before {
    content: "💬";
}

.z3c042icon_group::before {
    content: "👥";
}

.z3c042icon_file::before {
    content: "📁";
}

.z3c042icon_security::before {
    content: "🔒";
}

.z3c042icon_emoji::before {
    content: "😊";
}

.z3c042icon_voice::before {
    content: "📞";
}

.z3c042feature_title {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #333;
}

.z3c042feature_desc {
    color: #666;
    line-height: 1.8;
}

/* 三条聊天软件 */
.z3c042apps {
    padding: 80px 0;
    background-color: #fff;
}

.z3c042apps_list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 3rem;
}

.z3c042app_card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.z3c042app_card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

@media (hover: none) {
    .z3c042app_card:hover {
        transform: none;
    }
    
    .z3c042app_card:active {
        transform: translateY(-5px);
    }
}

.z3c042app_icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 20px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.z3c042app_icon_1::before {
    content: "💚";
}

.z3c042app_icon_2::before {
    content: "💼";
}

.z3c042app_icon_3::before {
    content: "📹";
}

.z3c042app_name {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.z3c042app_desc {
    margin-bottom: 20px;
    opacity: 0.9;
    line-height: 1.8;
}

.z3c042app_features {
    list-style: none;
    margin-bottom: 25px;
    text-align: left;
}

.z3c042app_features li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
}

.z3c042app_features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #fff;
    font-weight: bold;
}

.z3c042btn_app {
    background-color: #fff;
    color: #667eea;
    width: 100%;
    padding: 12px;
}

.z3c042btn_app:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 255, 255, 0.3);
}

/* 使用指南 */
.z3c042guide {
    padding: 80px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.z3c042guide_steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-top: 3rem;
}

.z3c042step {
    text-align: center;
    position: relative;
}

.z3c042step_number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: bold;
    margin: 0 auto 20px;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.z3c042step_title {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #333;
}

.z3c042step_desc {
    color: #666;
    line-height: 1.8;
}

/* 关于我们 */
.z3c042about {
    padding: 80px 0;
    background-color: #fff;
}

.z3c042about_content {
    max-width: 900px;
    margin: 0 auto;
}

.z3c042about_desc {
    font-size: 1.1rem;
    color: #666;
    line-height: 1.8;
    margin-bottom: 20px;
    text-align: center;
}

.z3c042about_stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.z3c042stat_item {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    color: #fff;
}

.z3c042stat_number {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.z3c042stat_label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 页脚 */
.z3c042footer {
    background: #2c3e50;
    color: #fff;
    padding: 60px 0 20px;
}

.z3c042footer_content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.z3c042footer_title {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #fff;
}

.z3c042footer_list {
    list-style: none;
}

.z3c042footer_list li {
    margin-bottom: 10px;
}

.z3c042footer_link {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    padding: 4px 0;
    min-height: 32px;
}

.z3c042footer_link:hover {
    color: #fff;
}

.z3c042footer_links {
    margin-bottom: 30px;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.z3c042footer_ads {
    margin: 30px 0;
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.z3c042footer_ads script,
.z3c042footer_ads iframe {
    max-width: 100%;
    display: block;
    margin: 0 auto;
}

.z3c042footer_links ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin: 0;
    padding: 0;
}

.z3c042footer_links li {
    margin: 0;
}

.z3c042footer_bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.z3c042copyright {
    color: #bdc3c7;
    font-size: 0.9rem;
    margin-bottom: 10px;
    line-height: 1.6;
}

.z3c042copyright:last-child {
    margin-bottom: 0;
}

.z3c042copyright a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s;
}

.z3c042copyright a:hover {
    color: #fff;
}

/* 响应式设计 */

/* 平板横屏和小桌面 (768px - 1024px) */
@media (max-width: 1024px) and (min-width: 769px) {
    .z3c042download_grid,
    .z3c042features_grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .z3c042apps_list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .z3c042guide_steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .z3c042about_stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .z3c042footer_content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 平板竖屏和移动设备 (最大768px) */
@media (max-width: 768px) {
    .z3c042container {
        padding: 0 15px;
    }

    .z3c042mobile_menu {
        display: flex;
    }

    .z3c042nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        width: 100%;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        z-index: 1000;
    }

    .z3c042menu_checkbox:checked ~ .z3c042nav {
        max-height: 400px;
    }

    .z3c042nav_list {
        flex-direction: column;
        gap: 0;
        padding: 0;
        margin: 0;
        list-style: none;
        width: 100%;
    }

    .z3c042nav_item {
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        margin: 0;
    }

    .z3c042nav_item:last-child {
        border-bottom: none;
    }

    .z3c042nav_link {
        width: 100%;
        padding: 15px 20px;
        display: flex;
        align-items: center;
        justify-content: flex-start;
        min-height: 50px;
        box-sizing: border-box;
    }

    .z3c042nav_link:hover,
    .z3c042nav_link:active {
        background-color: rgba(255, 255, 255, 0.15);
    }

    .z3c042hero {
        padding: 50px 0;
        min-height: auto;
    }

    .z3c042hero .z3c042container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 30px;
    }

    .z3c042hero_title {
        font-size: 2.2rem;
        line-height: 1.3;
    }

    .z3c042hero_subtitle {
        font-size: 1.1rem;
    }

    .z3c042hero_desc {
        font-size: 1rem;
        padding: 0 10px;
    }

    .z3c042hero_img {
        max-height: 350px;
        margin: 0 auto;
    }

    .z3c042section_title {
        font-size: 2rem;
        line-height: 1.3;
    }

    .z3c042section_desc {
        font-size: 1.1rem;
        padding: 0 10px;
    }

    .z3c042download,
    .z3c042features,
    .z3c042apps,
    .z3c042guide,
    .z3c042about {
        padding: 60px 0;
    }

    .z3c042download_grid,
    .z3c042features_grid,
    .z3c042apps_list {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .z3c042guide_steps {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .z3c042about_stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .z3c042footer_content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .z3c042footer_links ul {
        flex-direction: column;
        gap: 10px;
    }

    .z3c042hero_buttons {
        justify-content: center;
        flex-direction: column;
        width: 100%;
    }

    .z3c042btn {
        width: 100%;
        max-width: 280px;
    }

    .z3c042download_card,
    .z3c042feature_item,
    .z3c042app_card {
        padding: 30px 20px;
    }
}

/* 小屏手机 (最大480px) */
@media (max-width: 480px) {
    .z3c042container {
        padding: 0 12px;
    }

    .z3c042header {
        padding: 0.8rem 0;
    }

    .z3c042hero {
        padding: 35px 0;
        min-height: auto;
    }

    .z3c042hero_title {
        font-size: 1.8rem;
        margin-bottom: 0.8rem;
    }

    .z3c042hero_subtitle {
        font-size: 0.95rem;
        margin-bottom: 0.8rem;
    }

    .z3c042hero_desc {
        font-size: 0.9rem;
        margin-bottom: 1.5rem;
        line-height: 1.6;
    }

    .z3c042hero_buttons {
        gap: 0.8rem;
    }

    .z3c042btn {
        padding: 12px 20px;
        font-size: 0.9rem;
        width: 100%;
        max-width: 100%;
    }

    .z3c042hero_img {
        max-height: 280px;
        border-radius: 15px;
    }

    .z3c042download,
    .z3c042features,
    .z3c042apps,
    .z3c042guide,
    .z3c042about {
        padding: 40px 0;
    }

    .z3c042section_title {
        font-size: 1.6rem;
        margin-bottom: 0.8rem;
    }

    .z3c042section_desc {
        font-size: 0.95rem;
        margin-bottom: 2rem;
    }

    .z3c042download_grid,
    .z3c042features_grid,
    .z3c042apps_list {
        gap: 15px;
        margin-top: 2rem;
    }

    .z3c042download_card,
    .z3c042feature_item,
    .z3c042app_card {
        padding: 25px 15px;
    }

    .z3c042download_title,
    .z3c042feature_title,
    .z3c042app_name {
        font-size: 1.2rem;
    }

    .z3c042download_desc,
    .z3c042feature_desc,
    .z3c042app_desc {
        font-size: 0.9rem;
    }

    .z3c042download_info {
        padding: 12px;
        flex-direction: column;
        gap: 8px;
    }

    .z3c042version,
    .z3c042size {
        font-size: 0.85rem;
    }

    .z3c042guide_steps {
        gap: 25px;
        margin-top: 2rem;
    }

    .z3c042step_number {
        width: 60px;
        height: 60px;
        font-size: 2rem;
    }

    .z3c042step_title {
        font-size: 1.2rem;
    }

    .z3c042step_desc {
        font-size: 0.9rem;
    }

    .z3c042about_stats {
        gap: 15px;
        margin-top: 30px;
    }

    .z3c042stat_item {
        padding: 20px 15px;
    }

    .z3c042stat_number {
        font-size: 2rem;
    }

    .z3c042stat_label {
        font-size: 0.95rem;
    }

    .z3c042footer {
        padding: 40px 0 15px;
    }

    .z3c042footer_content {
        gap: 25px;
        margin-bottom: 30px;
    }

    .z3c042footer_title {
        font-size: 1.1rem;
        margin-bottom: 15px;
    }

    .z3c042footer_link {
        font-size: 0.9rem;
    }

    .z3c042copyright {
        font-size: 0.8rem;
        line-height: 1.5;
    }
}

/* 超小屏手机 (最大360px) */
@media (max-width: 360px) {
    .z3c042hero_title {
        font-size: 1.5rem;
    }

    .z3c042section_title {
        font-size: 1.4rem;
    }

    .z3c042hero_img {
        max-height: 240px;
    }

    .z3c042download_card,
    .z3c042feature_item,
    .z3c042app_card {
        padding: 20px 12px;
    }
}