* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    text-decoration: none;
}

body {
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 头部样式 */
header {
    background: linear-gradient(135deg, #4CAF50 0%, #2E7D32 100%);
    color: white;
    padding: 1.5rem 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    font-size: 1.8rem;
    font-weight: 700;
}

.logo-icon {
    margin: 5px;
    justify-content: center;
    align-items: center;
    height: 38px;
    font-size: 2.2rem;
    margin-right: 10px;
}

.brand-name {
    color: #FFEB3B;
}

nav ul {
    display: flex;
    list-style: none;
}

nav li {
    margin-left: 1.8rem;
}

nav a {
    color: white;
    font-weight: 500;
    transition: opacity 0.3s;
}

nav a:hover {
    opacity: 0.9;
    text-decoration: underline;
}

/* 移动端导航按钮 */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 主要内容区 */
.hero {
    padding: 4rem 0;
    text-align: center;
    background-color: white;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1.2rem;
    color: #2c3e50;
}

.hero p {
    font-size: 1.2rem;
    max-width: 900px;
    margin: 0 auto 1.5rem;
    color: #555;
}

.hero .description {
    font-size: 1.1rem;
    line-height: 1.8;
}

.highlight {
    color: #4CAF50;
    font-weight: 700;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(to right, #4CAF50, #2E7D32);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
    transition: transform 0.3s, box-shadow 0.3s;
    margin-top: 1.5rem;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
}

/* 功能特点 */
.features {
    padding: 4rem 0;
    background-color: #f0f9f1;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: #2c3e50;
    margin: 25px auto;
}

.section-title.center {
    text-align: center;
}

.section-title.left {
    text-align: left;
}

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

.feature-card {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.feature-icon {
    font-size: 2.5rem;
    color: #4CAF50;
    margin-bottom: 1.2rem;
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: #2c3e50;
}

/* 二维码区域 */
.qr-section {
    padding: 4rem 0;
    background-color: white;
}

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

.qr-section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.qr-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.qr-card {
    background: #f9f9f9;
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s;
}

.qr-card:hover {
    transform: translateY(-8px);
}

.qr-card.english {
    border-top: 5px solid #2196F3;
}

.qr-card.chinese {
    border-top: 5px solid #FF9800;
}

.qr-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

.qr-title.english {
    color: #2196F3;
}

.qr-title.chinese {
    color: #FF9800;
}

.qr-code {
    width: 200px;
    height: 200px;
    background: #eee;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-size: 0.9rem;
    color: #666;
}

.qr-desc {
    color: #666;
    margin-bottom: 1.5rem;
}

.qr-button {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    font-weight: 600;
    transition: background-color 0.3s;
}

.qr-button.english {
    background-color: #2196F3;
    color: white;
}

.qr-button.chinese {
    background-color: #FF9800;
    color: white;
}

.qr-button:hover {
    opacity: 0.9;
}

/* 使用场景 */
.use-cases {
    padding: 4rem 0;
    background-color: #f0f9f1;
}

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

.case-item {
    background: white;
    border-radius: 10px;
    padding: 1.8rem;
    text-align: center;
}

.case-icon {
    font-size: 2.2rem;
    color: #4CAF50;
    margin-bottom: 1rem;
}

/* 页脚 */
footer {
    background-color: #2c3e50;
    color: white;
    padding: 3rem 0 1.5rem;
}

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

.footer-section h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: #FFEB3B;
}

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

.footer-section li {
    margin-bottom: 0.8rem;
}

.footer-section a {
    color: #ddd;
}

.footer-section a:hover {
    color: #4CAF50;
}

.copyright {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid #444;
    color: #aaa;
    font-size: 0.9rem;
}
.copyright a {
  color: inherit;        /* 继承父元素文字颜色 */
  text-decoration: none; /* 去除下划线 */
}

/* 文章页专用样式 */
/* 文章列表卡片美化 */
.article-card {
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.article-card h2 a {
    color: #2c3e50;
}

.article-card h2 a:hover {
    color: #4CAF50;
}

.article-card a {
    color: #2c3e50;
}

.article-meta {
    font-size: 13px;
    color: #888;
    margin: 10px 0;
}

.article-summary {
    font-size: 15px;
    color: #555;
    line-height: 1.7;
}

/* 文章详情页 */
.article-detail-page {
    max-width: 1200px;
    margin: 20px auto;
    background: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,.05);
}

.article-detail {
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    margin: 40px auto;
    max-width: 900px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.article-detail h1 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 15px;
    line-height: 1.4;
}

.article-title {
    font-size: 28px;
    margin-bottom: 15px;
}

.article-meta {
    color: #666;
    font-size: 14px;
    margin-bottom: 20px;
}

.article-meta span {
    margin-right: 15px;
}

.article-content, .content-body {
    font-size: 16px;
    line-height: 1.8;
    color: #444;
    padding: 20px;
}

.article-content img, .content-body img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
    border-radius: 8px;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        text-align: center;
    }
    
    .logo {
        margin-bottom: 1rem;
    }
    
    nav ul {
        flex-direction: column;
        width: 100%;
    }
    
    nav li {
        margin: 0.5rem 0;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .class-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .qr-grid, .qr-display {
        grid-template-columns: 1fr;
        flex-direction: column;
        gap: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
        padding: 0 15px;
    }
    
    .mobile-nav-toggle {
        display: block;
        position: absolute;
        top: 1.5rem;
        right: 20px;
    }
    
    .nav-menu {
        display: none;
        width: 100%;
    }
    
    .nav-menu.active {
        display: block;
    }
    
    .class-selection {
        padding: 1.8rem;
        margin: 1.8rem auto 2.5rem;
    }
    
    .article-card {
        padding: 18px;
    }
    
    .article-detail {
        padding: 20px;
        margin: 20px auto;
    }
    
    .article-detail h1 {
        font-size: 1.6rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.7rem;
    }
    
    .section-title, .qr-section-title {
        font-size: 1.8rem;
    }
    
    .feature-card, .qr-card, .class-result {
        padding: 1.5rem;
    }
    
    .class-buttons {
        grid-template-columns: 1fr;
    }
    
    .class-btn {
        padding: 1rem 0.5rem;
    }
}
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, #4CAF50 0%, #2E7D32 100%);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 1.8rem;
            font-weight: 700;
        }
        
        .logo-icon {
            font-size: 2.2rem;
            margin-right: 10px;
        }
        
        .brand-name {
            color: #FFEB3B;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav li {
            margin-left: 1.8rem;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.3s;
        }
        
        nav a:hover {
            opacity: 0.9;
            text-decoration: underline;
        }
        
        /* 移动端导航按钮 */
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* 主要内容区 */
        .hero {
            padding: 3rem 0 4rem;
            text-align: center;
            background-color: white;
        }
        
        h1 {
            font-size: 2.5rem;
            margin-bottom: 1.2rem;
            color: #2c3e50;
        }
        
        .hero p {
            font-size: 1.2rem;
            max-width: 900px;
            margin: 0 auto 1.5rem;
            color: #555;
        }
        
        .hero .description {
            font-size: 1.1rem;
            line-height: 1.8;
        }
        
        .highlight {
            color: #4CAF50;
            font-weight: 700;
        }
        
        .cta-button {
            display: inline-block;
            background: linear-gradient(to right, #4CAF50, #2E7D32);
            color: white;
            padding: 1rem 2.5rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
            transition: transform 0.3s, box-shadow 0.3s;
            margin-top: 1.5rem;
        }
        
        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
        }
        
        /* 班级选择区域 */
        .class-selection {
            background-color: #f0f9f1;
            border-radius: 12px;
            padding: 2.5rem;
            margin: 2.5rem auto 3rem;
            max-width: 900px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
        }
        
        .class-selection h2 {
            font-size: 1.8rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
        }
        
        .class-instruction {
            font-size: 1.1rem;
            color: #666;
            margin-bottom: 2rem;
            line-height: 1.7;
        }
        
        .class-buttons {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.2rem;
            margin-bottom: 2.5rem;
        }
        
        .class-btn {
            background-color: white;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            padding: 1.2rem 0.5rem;
            font-size: 1.1rem;
            font-weight: 600;
            color: #444;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .class-btn:hover {
            border-color: #4CAF50;
            background-color: #f8fff8;
            transform: translateY(-2px);
        }
        
        .class-btn.active {
            border-color: #4CAF50;
            background-color: #4CAF50;
            color: white;
            box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
        }
        
        .class-result {
            display: none;
            background-color: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
            animation: fadeIn 0.6s ease-out;
        }
        
        .class-result.active {
            display: block;
        }
        
        .class-result h3 {
            font-size: 1.6rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            text-align: center;
        }
        
        .class-code {
            font-size: 1.8rem;
            color: #4CAF50;
            font-weight: 700;
            text-align: center;
            margin: 1rem 0 1.5rem;
            padding: 0.8rem;
            background-color: #f0f9f1;
            border-radius: 8px;
            letter-spacing: 2px;
        }
        
        .qr-display {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            gap: 3rem;
            margin-top: 2rem;
        }
        
        .qr-box {
            text-align: center;
            flex: 1;
            min-width: 250px;
        }
        
        .qr-box h4 {
            font-size: 1.3rem;
            color: #2c3e50;
            margin-bottom: 1rem;
        }
        
        .qr-img {
            width: 200px;
            height: 200px;
            background-color: #f5f5f5;
            border-radius: 10px;
            margin: 0 auto 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid #e0e0e0;
            overflow: hidden;
        }
        
        .qr-img img {
            max-width: 100%;
            height: auto;
        }
        
        .qr-note {
            color: #666;
            font-size: 0.95rem;
            margin-top: 0.5rem;
        }
        
        .instruction {
            background-color: #fff8e1;
            border-left: 4px solid #FFC107;
            padding: 1.2rem;
            border-radius: 0 8px 8px 0;
            margin-top: 2rem;
            text-align: left;
        }
        
        .instruction h4 {
            color: #FF9800;
            margin-bottom: 0.5rem;
        }
        
        .instruction ol {
            padding-left: 1.2rem;
        }
        
        .instruction li {
            margin-bottom: 0.5rem;
        }
        
        /* 功能特点 */
        .features {
            padding: 4rem 0;
            background-color: #f0f9f1;
        }
        
        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 3rem;
            color: #2c3e50;
        }
        
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        .feature-card {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            color: #4CAF50;
            margin-bottom: 1.2rem;
        }
        
        .feature-card h3 {
            font-size: 1.4rem;
            margin-bottom: 1rem;
            color: #2c3e50;
        }
        
        /* 二维码区域 */
        .qr-section {
            padding: 4rem 0;
            background-color: white;
        }
        
        .qr-container {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .qr-section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 3rem;
            color: #2c3e50;
        }
        
        .qr-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
        }
        
        .qr-card {
            background: #f9f9f9;
            border-radius: 12px;
            padding: 2.5rem;
            text-align: center;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s;
        }
        
        .qr-card:hover {
            transform: translateY(-8px);
        }
        
        .qr-card.english {
            border-top: 5px solid #2196F3;
        }
        
        .qr-card.chinese {
            border-top: 5px solid #FF9800;
        }
        
        .qr-title {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: #2c3e50;
        }
        
        .qr-title.english {
            color: #2196F3;
        }
        
        .qr-title.chinese {
            color: #FF9800;
        }
        
        .qr-code {
            width: 200px;
            height: 200px;
            background: #eee;
            margin: 0 auto 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            font-size: 0.9rem;
            color: #666;
        }
        
        .qr-desc {
            color: #666;
            margin-bottom: 1.5rem;
        }
        
        .qr-button {
            display: inline-block;
            padding: 0.8rem 1.8rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: background-color 0.3s;
        }
        
        .qr-button.english {
            background-color: #2196F3;
            color: white;
        }
        
        .qr-button.chinese {
            background-color: #FF9800;
            color: white;
        }
        
        .qr-button:hover {
            opacity: 0.9;
        }
        
        /* 使用场景 */
        .use-cases {
            padding: 4rem 0;
            background-color: #f0f9f1;
        }
        
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        
        .case-item {
            background: white;
            border-radius: 10px;
            padding: 1.8rem;
            text-align: center;
        }
        
        .case-icon {
            font-size: 2.2rem;
            color: #4CAF50;
            margin-bottom: 1rem;
        }
        
        /* 页脚 */
        footer {
            background-color: #2c3e50;
            color: white;
            padding: 3rem 0 1.5rem;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        
        .footer-section h3 {
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            color: #FFEB3B;
        }
        
        .footer-section ul {
            list-style: none;
        }
        
        .footer-section li {
            margin-bottom: 0.8rem;
        }
        
        .footer-section a {
            color: #ddd;
            text-decoration: none;
        }
        
        .footer-section a:hover {
            color: #4CAF50;
        }
        
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            color: #aaa;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                text-align: center;
            }
            
            .logo {
                margin-bottom: 1rem;
            }
            
            nav ul {
                flex-direction: column;
                width: 100%;
            }
            
            nav li {
                margin: 0.5rem 0;
            }
            
            h1 {
                font-size: 2rem;
            }
            
            .class-buttons {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .qr-grid, .qr-display {
                grid-template-columns: 1fr;
                flex-direction: column;
                gap: 2rem;
            }
            
            .hero p {
                font-size: 1.1rem;
                padding: 0 15px;
            }
            
            .mobile-nav-toggle {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 20px;
            }
            
            .nav-menu {
                display: none;
                width: 100%;
            }
            
            .nav-menu.active {
                display: block;
            }
            
            .class-selection {
                padding: 1.8rem;
                margin: 1.8rem auto 2.5rem;
            }
        }
        
        @media (max-width: 480px) {
            h1 {
                font-size: 1.7rem;
            }
            
            .section-title {
                font-size: 1.8rem;
            }
            
            .qr-section-title {
                font-size: 1.8rem;
            }
            
            .feature-card, .qr-card, .class-result {
                padding: 1.5rem;
            }
            
            .class-buttons {
                grid-template-columns: 1fr;
            }
            
            .class-btn {
                padding: 1rem 0.5rem;
            }
        }
        
        /* 动画 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        /*底部style*/
        /* 二维码弹窗样式 */
.qr-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    animation: fadeIn 0.3s ease;
}

.qr-modal-content {
    background-color: #fff;
    margin: 10% auto;
    padding: 25px;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    position: relative;
    animation: slideIn 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.qr-modal-close {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    color: #666;
    cursor: pointer;
    transition: color 0.3s;
}

.qr-modal-close:hover {
    color: #4CAF50;
}

#modalTitle {
    text-align: center;
    color: #2c3e50;
    margin: 10px 0 20px;
    font-size: 1.4rem;
}

.qr-modal-image {
    text-align: center;
    margin: 20px 0;
}

.qr-modal-image img {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 5px;
    background: #f9f9f9;
}

#modalDescription {
    text-align: center;
    color: #666;
    margin: 15px 0;
    font-size: 1rem;
    line-height: 1.5;
}

.qr-modal-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

.qr-modal-button {
    padding: 10px 25px;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.qr-modal-button:first-child {
    background: linear-gradient(to right, #4CAF50, #2E7D32);
    color: white;
}

.qr-modal-button:last-child {
    background: #f0f0f0;
    color: #333;
}

.qr-modal-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.footer-section a.qr-link {
    cursor: pointer;
    color: #ddd;
    text-decoration: none;
    transition: color 0.3s;
    position: relative;
}

.footer-section a.qr-link:hover {
    color: #4CAF50;
    text-decoration: underline;
}

.footer-section a.wechat-link {
    cursor: pointer;
    color: #ddd;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a.wechat-link:hover {
    color: #4CAF50;
    text-decoration: underline;
}

/* 动画 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { 
        opacity: 0;
        transform: translateY(-30px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式 */
@media (max-width: 768px) {
    .qr-modal-content {
        margin: 20% auto;
        padding: 20px;
        width: 85%;
    }
    
    .qr-modal-image img {
        width: 180px;
        height: 180px;
    }
    
    .qr-modal-actions {
        flex-direction: column;
        gap: 10px;
    }
    
    .qr-modal-button {
        width: 100%;
    }
}