/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    object-fit: cover;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.nav {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.nav a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.3s;
    font-weight: 500;
}

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

/* 主内容区 */
.main {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* Hero区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-desc {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

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

.btn {
    padding: 12px 30px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background-color: white;
    color: #667eea;
}

.btn-primary:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

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

.btn-secondary:hover {
    background-color: rgba(255,255,255,0.2);
}

/* 关键词区域 */
.keywords-section {
    margin-bottom: 3rem;
}

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

.keywords-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.keyword-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.keyword-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.keyword-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.keyword-card h3 {
    padding: 1rem;
    font-size: 1.2rem;
    color: #667eea;
}

.keyword-card p {
    padding: 0 1rem 1rem;
    color: #666;
}

/* 视频区域 */
.video-section {
    margin-bottom: 3rem;
}

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

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.video-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

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

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 */
    overflow: hidden;
    background-color: #000;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: rgba(255,255,255,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #667eea;
    cursor: pointer;
    transition: all 0.3s;
}

.video-thumbnail:hover .play-icon {
    background-color: white;
    transform: translate(-50%, -50%) scale(1.1);
}

.video-info {
    padding: 1rem;
}

.video-info h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.video-info p {
    color: #666;
    font-size: 0.9rem;
}

/* 内容区域 */
.content-section {
    margin-bottom: 3rem;
}

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

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.content-item {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.content-item h3 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.content-item p {
    margin-bottom: 1rem;
    color: #555;
    line-height: 1.8;
}

.advantage-list {
    list-style: none;
    padding-left: 0;
}

.advantage-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: #555;
}

.advantage-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.link-more {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    margin-top: 1rem;
}

.link-more:hover {
    text-decoration: underline;
}

/* 页面头部 */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.breadcrumb {
    opacity: 0.9;
}

.breadcrumb a {
    color: white;
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* 文章内容 */
.article-content {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    max-width: 900px;
    margin: 0 auto;
}

.article-content h2 {
    color: #667eea;
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.8rem;
    text-align: left;
}

.article-content h2:first-of-type {
    margin-top: 0;
}

.article-content p {
    margin-bottom: 1rem;
    color: #555;
    line-height: 1.8;
    font-size: 1rem;
}

.article-image {
    margin: 2rem 0;
    border-radius: 8px;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: auto;
    display: block;
}

.feature-box {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 2rem 0;
    border-left: 4px solid #667eea;
}

.feature-box img {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.feature-box p {
    color: #666;
}

.feature-detail {
    margin: 2rem 0;
}

.feature-header {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    margin-bottom: 2rem;
}

.feature-header.reverse {
    flex-direction: row-reverse;
}

.feature-header img {
    width: 400px;
    height: 250px;
    object-fit: cover;
    border-radius: 8px;
    flex-shrink: 0;
}

.feature-text {
    flex: 1;
}

.feature-text h3 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.feature-text ul {
    margin-top: 1rem;
    padding-left: 1.5rem;
}

.feature-text ul li {
    margin-bottom: 0.5rem;
    color: #555;
}

/* 步骤框 */
.step-box {
    display: flex;
    gap: 1.5rem;
    margin: 2rem 0;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 8px;
}

.step-number {
    width: 40px;
    height: 40px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step-content h3 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

.step-content p {
    color: #555;
    margin-bottom: 1rem;
}

.step-content img {
    width: 100%;
    max-width: 600px;
    border-radius: 6px;
    margin-top: 1rem;
}

/* 要求列表 */
.requirement-list {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    list-style-position: inside;
}

.requirement-list li {
    margin-bottom: 0.5rem;
    color: #555;
}

/* FAQ */
.faq-section {
    margin: 2rem 0;
}

.faq-item {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid #667eea;
}

.faq-item h4 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

.faq-item p {
    color: #555;
    margin: 0;
}

/* 功能网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 2rem 0;
}

.feature-card {
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.feature-card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.feature-card h4 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: #666;
    font-size: 0.9rem;
}

/* 技术区域 */
.tech-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 2rem 0;
}

.tech-item {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border-top: 3px solid #667eea;
}

.tech-item h4 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

.tech-item p {
    color: #555;
    margin: 0;
}

/* 相关链接 */
.related-links {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid #e0e0e0;
}

.related-links h3 {
    color: #333;
    margin-bottom: 1rem;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.related-link {
    display: block;
    text-decoration: none;
    color: inherit;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.related-link:hover {
    transform: translateY(-3px);
}

.related-link img {
    width: 100%;
    height: 120px;
    object-fit: cover;
}

.related-link span {
    display: block;
    padding: 1rem;
    color: #667eea;
    font-weight: 500;
    text-align: center;
}

/* 页脚 */
.footer {
    background: #2d2d2d;
    color: white;
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer .container {
    text-align: center;
}

.footer p {
    margin-bottom: 1rem;
    opacity: 0.9;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 1.8rem;
    }

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

    .header .container {
        flex-direction: column;
        gap: 15px;
    }

    .nav {
        justify-content: center;
    }

    .keywords-grid,
    .video-grid,
    .content-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-header,
    .feature-header.reverse {
        flex-direction: column;
    }

    .feature-header img {
        width: 100%;
    }

    .step-box {
        flex-direction: column;
    }

    .article-content {
        padding: 1.5rem;
    }

    .page-header h1 {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 2rem 0;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

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

    .nav a {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
}

/* 优化加载性能 */
img {
    loading: lazy;
}

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