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

:root {
    --primary-color: #0d2818;
    --secondary-color: #1a3d2e;
    --accent-color: #52b788;
    --gold-color: #ffd700;
    --text-light: #ffffff;
    --text-dark: #333333;
    --bg-light: #f5f5f5;
    --gradient-1: linear-gradient(135deg, #0d2818 0%, #1a3d2e 50%, #2d5016 100%);
    --gradient-2: linear-gradient(135deg, #1b4332 0%, #2d6a4f 100%);
    --gradient-3: linear-gradient(135deg, #40916c 0%, #52b788 100%);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    background: rgba(13, 40, 24, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-light);
}

.logo-img {
    width: 123px;
    height: 23px;
    object-fit: contain;
    display: block;
}

.logo-fallback {
    display: none;
    align-items: center;
    gap: 10px;
}

.logo-fallback i {
    color: var(--accent-color);
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s;
}

.nav-menu a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-light);
    transition: all 0.3s;
}

/* 英雄区域 */
.hero {
    position: relative;
    height: 700px;
    margin-top: 70px;
    background-image: url('../images/hero-bg-pc-1.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(82, 183, 136, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(26, 61, 46, 0.1) 0%, transparent 50%);
}

.hero .container {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 50px;
}

.hero-download-buttons {
    display: flex;
    gap: 20px;
    align-items: center;
    justify-content: center;
}

.hero-download-btn {
    display: inline-block;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.hero-download-btn:hover {
    transform: translateY(-5px);
}

.download-btn-img {
    width: 196px;
    height: 61px;
    display: block;
    object-fit: contain;
}

/* 移动端下载按钮区域 */
.mobile-download-section {
    display: none;
    padding: 30px 0;
    background: var(--primary-color);
}

.mobile-download-buttons {
    display: flex;
    flex-direction: row;
    gap: 20px;
    align-items: center;
    justify-content: center;
}

.mobile-download-btn {
    display: inline-block;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.mobile-download-btn:hover {
    transform: translateY(-3px);
}

.mobile-download-btn-img {
    width: 175px;
    height: 73px;
    display: block;
    object-fit: contain;
}

/* 新闻资讯 */
.news-section {
    padding: 80px 0;
    background: var(--primary-color);
}

.news-section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.news-section-subtitle {
    text-align: center;
    font-size: 1rem;
    color: var(--accent-color);
    margin-bottom: 3rem;
}

.news-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.news-featured {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.news-featured-image {
    width: 100%;
    overflow: hidden;
    border-radius: 10px;
}

.news-featured-image img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.news-featured-article {
    padding: 20px 0;
}

.news-featured-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 15px;
    line-height: 1.6;
}

.news-featured-date {
    font-size: 0.9rem;
    color: var(--accent-color);
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.news-item {
    display: flex;
    gap: 15px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    transition: all 0.3s;
    cursor: pointer;
}

.news-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.news-item-thumbnail {
    width: 120px;
    height: 80px;
    flex-shrink: 0;
    overflow: hidden;
    border-radius: 8px;
}

.news-item-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.news-item-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.news-item-title {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-light);
    margin-bottom: 10px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-item-date {
    font-size: 0.8rem;
    color: var(--accent-color);
}

/* AA朋友圈 */
.friends-circle-section {
    padding: 80px 0;
    background: var(--primary-color);
}

.friends-circle-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.friends-circle-subtitle {
    text-align: center;
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    opacity: 0.9;
}

.friends-circle-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 20px;
    overflow: hidden;
    width: 100%;
}

.friends-circle-section .container {
    overflow: hidden;
    width: 100%;
    max-width: calc(375px * 4 + 30px * 3 + 40px);
    margin: 0 auto;
}

.friends-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--accent-color);
    border-radius: 50%;
    color: var(--text-light);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.friends-nav-prev {
    left: -25px;
}

.friends-nav-next {
    right: -25px;
}

.friends-nav-btn:hover {
    background: var(--accent-color);
    transform: translateY(-50%) scale(1.1);
}

.friends-circle-list {
    display: flex;
    gap: 30px;
    overflow-x: hidden;
    overflow-y: hidden;
    scroll-behavior: smooth;
    padding: 20px 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
    width: 100%;
}

.friends-circle-list::-webkit-scrollbar {
    display: none;
}

.friend-card {
    flex-shrink: 0;
    width: 375px;
    height: 482px;
    background: transparent;
    border-radius: 15px;
    overflow: hidden;
    position: relative;
    transition: transform 0.3s;
}

.friend-card:hover {
    transform: translateY(-10px);
}

.friend-card-image {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: transparent;
    position: relative;
}

.friend-card-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.friend-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 15px;
    text-align: center;
}

.friend-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    align-items: center;
}

.friend-badge {
    padding: 5px 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.friend-social {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #ff0000;
    font-size: 0.9rem;
}

.friend-social i {
    font-size: 1.2rem;
}

.friend-logo {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-light);
    font-size: 0.85rem;
}

.friend-logo i {
    color: var(--accent-color);
    font-size: 1rem;
}

/* 介绍板块 */
.intro-section {
    padding: 100px 0;
    background: var(--primary-color);
}

.intro-section-title {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.intro-section-subtitle {
    text-align: center;
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-bottom: 3rem;
    opacity: 0.9;
}

.intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    justify-items: center;
}

.intro-text {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: -50px;
}

.intro-title {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.intro-description {
    font-size: 0.85rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 15px;
}

.intro-features {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

.intro-feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1rem;
    color: var(--text-light);
}

.intro-feature-item i {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.intro-image {
    width: 100%;
    height: 500px;
    overflow: hidden;
    border-radius: 15px;
}

.intro-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 介绍小板块 */
.intro-sub-sections {
    padding: 80px 0;
    background: var(--primary-color);
}

.intro-sub-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.intro-sub-item:last-child {
    margin-bottom: 0;
}

.intro-sub-reverse .intro-sub-text {
    grid-column: 1;
}

.intro-sub-reverse .intro-sub-image {
    grid-column: 2;
}

.intro-sub-text {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.intro-sub-title {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 15px;
}

.intro-sub-description {
    font-size: 0.85rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
}

.intro-sub-image {
    width: 100%;
    height: 400px;
    overflow: hidden;
    border-radius: 15px;
}

.intro-sub-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.btn {
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--text-light);
    box-shadow: 0 5px 20px rgba(82, 183, 136, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(82, 183, 136, 0.6);
    background: #40916c;
}

.btn-secondary {
    background: transparent;
    color: var(--text-light);
    border: 2px solid var(--text-light);
}

.btn-secondary:hover {
    background: var(--text-light);
    color: var(--primary-color);
}


/* 功能特色 */
.features {
    padding: 100px 0;
    background: var(--primary-color);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--accent-color);
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: rgba(82, 183, 136, 0.1);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    transition: all 0.3s;
    border: 1px solid rgba(82, 183, 136, 0.2);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    background: rgba(82, 183, 136, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--text-light);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.feature-card p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: var(--primary-color);
    color: var(--text-light);
}

.download .section-title,
.download .section-subtitle {
    color: var(--text-light);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.download-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s;
}

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

.download-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--gold-color);
}

.download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.download-card p {
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.btn-download {
    background: var(--accent-color);
    color: var(--text-light);
    padding: 12px 25px;
    border-radius: 50px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
    margin-bottom: 1rem;
}

.btn-download:hover {
    background: #40916c;
    transform: scale(1.05);
}

.download-size {
    font-size: 0.9rem;
    opacity: 0.7;
}

.download-app-showcase {
    text-align: center;
    margin: 3rem 0;
}

.app-screenshots {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.app-screenshot-item {
    position: relative;
    border-radius: 0;
    overflow: hidden;
    box-shadow: none;
    transition: none;
    background: transparent;
    border: none;
}

.app-screenshot-item:hover {
    transform: none;
    box-shadow: none;
}

.app-screenshot-img {
    width: 100%;
    max-width: 800px;
    height: auto;
    display: block;
    object-fit: contain;
}

.app-screenshot-placeholder {
    width: 100%;
    max-width: 800px;
    height: 450px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-light);
}

.app-screenshot-placeholder i {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.app-screenshot-placeholder p {
    font-size: 1rem;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .app-screenshot-img {
        max-width: 100%;
    }
    
    .app-screenshot-placeholder {
        max-width: 100%;
        height: 300px;
    }
}

/* 安装步骤 */
.steps {
    padding: 100px 0;
    background: var(--primary-color);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.step-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient-1);
    color: var(--text-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.step-content p {
    color: rgba(255, 255, 255, 0.9);
}

/* 文章正文板块 */
.article-section {
    padding: 100px 0;
    background: var(--bg-light);
}

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

.article-title {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 20px;
    text-align: center;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 0.95rem;
    color: #666;
}

.article-date,
.article-author {
    display: inline-block;
}

.article-body {
    line-height: 1.8;
    color: #333;
}

.article-body p {
    margin-bottom: 20px;
    font-size: 1rem;
}

.article-body h3 {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 30px 0 15px;
}

.article-list {
    list-style: none;
    padding-left: 0;
    margin: 20px 0;
}

.article-list li {
    padding: 10px 0 10px 25px;
    position: relative;
    color: #333;
}

.article-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-size: 1.5rem;
    line-height: 1;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    justify-content: center;
}

.tag {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(82, 183, 136, 0.1);
    border: 1px solid var(--accent-color);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--primary-color);
    transition: all 0.3s;
    cursor: pointer;
}

.tag:hover {
    background: var(--accent-color);
    color: var(--text-light);
    transform: translateY(-2px);
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.contact-item {
    text-align: center;
    padding: 2rem;
    border-radius: 15px;
    background: var(--bg-light);
    transition: all 0.3s;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.contact-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: var(--gradient-2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--text-light);
}

.contact-item h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.contact-item p {
    color: #666;
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: var(--text-light);
    padding: 50px 0 20px;
}

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

.footer-logo {
    margin-bottom: 20px;
}

.footer-logo-img {
    height: 35px;
    width: auto;
    object-fit: contain;
    display: block;
}

.footer-logo-fallback {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--gold-color);
}

.footer-logo-fallback i {
    color: var(--accent-color);
    font-size: 1.8rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--gold-color);
}

.footer-section p {
    opacity: 0.8;
    line-height: 1.8;
    margin-bottom: 15px;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-light);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-section ul li a:hover {
    opacity: 1;
    color: var(--accent-color);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    transition: all 0.3s;
}

.social-links a:hover {
    background: var(--accent-color);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--primary-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

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

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

    .hero {
        height: 600px;
        background-image: url('../images/hero-bg-mobile-1.jpg');
    }

    .hero-download-buttons {
        display: none;
    }

    .mobile-download-section {
        display: block;
    }

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

    .news-featured-image {
        max-width: 100%;
    }

    .news-list {
        display: flex;
        flex-direction: row;
        gap: 15px;
        overflow-x: auto;
        overflow-y: hidden;
        padding-bottom: 10px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
        scrollbar-color: var(--accent-color) transparent;
    }

    .news-list::-webkit-scrollbar {
        height: 6px;
    }

    .news-list::-webkit-scrollbar-track {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 3px;
    }

    .news-list::-webkit-scrollbar-thumb {
        background: var(--accent-color);
        border-radius: 3px;
    }

    .news-item {
        flex-direction: column;
        flex-shrink: 0;
        width: 280px;
        min-width: 280px;
    }

    .news-item-thumbnail {
        width: 100%;
        height: 180px;
    }

    .news-item-title {
        -webkit-line-clamp: 3;
        line-clamp: 3;
    }

    .friends-nav-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .friends-nav-prev {
        left: 10px;
    }

    .friends-nav-next {
        right: 10px;
    }

    .friends-circle-section .container {
        max-width: calc(300px + 40px);
    }

    .friends-circle-list {
        width: 100%;
    }

    .friend-card {
        width: 300px;
        height: 386px;
    }

    .intro-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .intro-image {
        order: -1;
        height: 300px;
    }

    .intro-text {
        margin-top: 0;
        text-align: center;
    }

    .intro-section-title {
        font-size: 1.2rem;
    }

    .intro-section-subtitle {
        font-size: 0.75rem;
        margin-bottom: 2rem;
    }

    .intro-title {
        font-size: 1.1rem;
    }

    .intro-description {
        font-size: 0.75rem;
    }

    .intro-sub-item {
        grid-template-columns: 1fr;
        gap: 30px;
        margin-bottom: 50px;
    }

    .intro-sub-reverse .intro-sub-text {
        grid-column: 1;
        order: 2;
    }

    .intro-sub-reverse .intro-sub-image {
        grid-column: 1;
        order: 1;
    }

    .intro-sub-image {
        order: -1;
        height: 250px;
    }

    .intro-sub-title {
        font-size: 1.2rem;
        text-align: center;
    }

    .intro-sub-description {
        font-size: 0.8rem;
        text-align: center;
    }

    .features-grid,
    .download-grid,
    .steps-container,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .article-title {
        font-size: 2rem;
    }

    .article-meta {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

    .article-body {
        font-size: 0.95rem;
    }

    .article-body h3 {
        font-size: 1.3rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 选中文本样式 */
::selection {
    background: var(--accent-color);
    color: var(--text-light);
}