* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: #ffffff;
    border-bottom: 1px solid #e9ecef;
    padding: 0.5rem 0; /* 减少这个值可以让header高度变小，从而让图片向上移动 */
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #212529;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.1rem;
    color: #6c757d;
    font-weight: 400;
}

/* Main Content */
main {
    padding: 0rem 0; /* 可以减少这个值来让整个内容区域向上移动 */
}

.hero {
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    padding: 2rem; /* 减少这个值可以让图片向上移动 */
    margin-bottom: 2rem;
    /* 可以添加 margin-top: 负值; 来进一步向上移动 */
}

.app-showcase {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.app-image {
    flex: 0 0 66.67%;
    text-align: center;
}

.app-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.app-info {
    flex: 0 0 33.33%;
    min-width: 0;
    padding-left: 2rem;
}

.app-info h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #212529;
    margin-bottom: 1rem;
}

.app-description {
    font-size: 1.1rem;
    color: #6c757d;
    margin-bottom: 2rem;
    line-height: 1.5;
}

.download-btn {
    display: inline-block;
    background-color: #212529;
    color: #ffffff;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    border: 2px solid #212529;
}

.download-btn:hover {
    background-color: #ffffff;
    color: #212529;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Footer */
footer {
    background-color: #212529;
    color: #ffffff;
    padding: 2rem 0;
    margin-top: 4rem;
}

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

.footer-content p {
    margin-bottom: 0.5rem;
}

.icp {
    font-size: 0.9rem;
    color: #adb5bd;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .hero {
        padding: 2rem;
    }
    
    .app-showcase {
        flex-direction: column;
        gap: 2rem;
    }
    
    .app-info h2 {
        font-size: 2.5rem;
    }
    
    .app-description {
        font-size: 1.1rem;
    }
    
    main {
        padding: 2rem 0;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .app-info h2 {
        font-size: 2rem;
    }
    
    .hero {
        padding: 1.5rem;
    }
    
    .download-btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}