body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 40px 20px;
    text-align: center;
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
}

.intro {
    background: white;
    padding: 40px;
    margin: 40px auto;
    max-width: 800px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.intro-image {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 8px;
    margin-top: 20px;
}

.software-item {
    transition: transform 0.3s ease;
}

.software-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

nav a {
    padding: 10px 20px;
    border-radius: 4px;
    transition: background 0.3s ease;
}

nav a:hover {
    background: rgba(255,255,255,0.1);
}

nav {
    margin-top: 10px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
}

main {
    padding: 20px;
}

.software-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.software-item {
    background: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.software-tip {
    color: #666;
    font-size: 0.9em;
    margin-bottom: 20px;
}

.upload-form, .download-form {
    max-width: 500px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

input[type="file"], input[type="text"], input[type="password"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    background-color: #333;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #555;
}

.download-btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 24px;
    background-color: #28a745;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.download-btn:hover {
    background-color: #218838;
}

.progress-container {
    width: 100%;
    height: 5px;
    background: #ddd;
    margin-bottom: 15px;
}

.progress-bar {
    height: 100%;
    width: 0;
    background: #28a745;
    transition: width 0.3s ease;
}


.message-form {
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.message-form textarea {
    width: 100%;
    height: 150px;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    resize: vertical;
}

.message-list {
    max-width: 800px;
    margin: 40px auto;
}

.message-item {
    background: white;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.message-item h3 {
    color: #333;
    margin-bottom: 5px;
}

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

.pagination {
    margin-top: 20px;
    text-align: center;
}

.pagination button {
    background-color: #333;
    color: white;
    padding: 8px 16px;
    margin: 0 5px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.pagination button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

/* 添加移动端样式 */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }
    
    header {
        padding: 20px 10px;
    }
    
    nav a {
        display: block;
        margin: 5px 0;
    }
    
    .software-item {
        width: 100%;
        margin: 10px 0;
    }
    
    .message-form {
        padding: 15px;
    }
    
    .message-item {
        padding: 10px;
    }
}