:root {
    --primary-color: #0d6efd;
    --secondary-color: #20c997;
    --dark-bg: #121212;
    --darker-bg: #0a0a0a;
    --light-text: #f8f9fa;
    --gray-text: #adb5bd;
    --border-color: #2d3748;
    --card-bg: #1e1e1e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 头部样式 */
header {
    background-color: var(--darker-bg);
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

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

.logo-icon {
    color: var(--secondary-color);
    font-size: 2.2rem;
    margin-right: 12px;
}

.logo-text h1 {
    font-size: 1.8rem;
    line-height: 1.2;
}

.logo-text .subtitle {
    font-size: 0.9rem;
    color: var(--gray-text);
    font-weight: normal;
}

.language-switcher {
    display: flex;
    gap: 10px;
}

.lang-btn {
    background: transparent;
    color: var(--light-text);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.lang-btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* 主内容区样式 */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.1) 0%, rgba(32, 201, 151, 0.1) 100%);
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--gray-text);
    max-width: 800px;
    margin: 0 auto 40px;
}

.features {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 80px;
}

.feature-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    flex: 1;
    min-width: 300px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--gray-text);
}

/* 下载区域 */
.download-section {
    text-align: center;
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.download-section h3 {
    font-size: 2.2rem;
    margin-bottom: 20px;
}

.download-section p {
    color: var(--gray-text);
    max-width: 700px;
    margin: 0 auto 40px;
}

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
}

.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.qr-code {
    width: 180px;
    height: 180px;
    background-color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 12px;
    margin-bottom: 15px;
    color: #000;
    font-weight: bold;
}

.qr-code i {
    font-size: 3rem;
    color: #333;
}

.qr-label {
    font-weight: 600;
}

.qr-subtitle {
    color: var(--gray-text);
    font-size: 0.9rem;
    margin-top: 5px;
}

/* 底部样式 */
footer {
    background-color: var(--darker-bg);
    padding: 40px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section {
    flex: 1;
    min-width: 250px;
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

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

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

.contact-info {
    color: var(--gray-text);
}

.contact-info p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.contact-info i {
    margin-right: 10px;
    color: var(--secondary-color);
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--gray-text);
    font-size: 0.9rem;
}

.beian {
    margin-top: 10px;
}

.beian a {
    color: var(--gray-text);
    text-decoration: none;
    margin: 0 10px;
}

.beian a:hover {
    color: var(--primary-color);
}

/* 语言切换内容显示控制 */
.lang-content {
    display: none;
}

.lang-content.active {
    display: block;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 2.2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .feature-card {
        min-width: 100%;
    }
    
    .qr-codes {
        gap: 30px;
    }
    
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
}