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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f7f6;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

.container {
    background-color: #ffffff;
    padding: 2.5em;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    width: 100%;
    max-width: 800px;
    text-align: center;
    margin-top: 60px;
}

h1 {
    color: #333;
    font-size: 2em;
    margin-bottom: 1em;
}

#json-input {
    width: 100%;
    min-height: 300px;
    padding: 1em;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1em;
    resize: vertical;
    outline: none;
    transition: border-color 0.3s;
    margin-bottom: 1em;
}

#json-input:focus {
    border-color: #007bff;
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 1em;
    margin: 1.5em 0;
    flex-wrap: wrap;
}

#format-button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 0.8em 2em;
    font-size: 1em;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#format-button:hover {
    background-color: #0056b3;
}

#json-output {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    padding: 1.5em;
    text-align: left;
    white-space: pre-wrap;
    word-wrap: break-word;
    margin-top: 1em;
    border-radius: 8px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    display: none;
}

#success-message {
    background-color: #d4edda;
    color: #155724;
    padding: 1rem;
    border: 1px solid #c3e6cb;
    border-radius: 8px;
    margin: 1em 0;
    display: none;
}

#error-message {
    color: #dc3545;
    padding: 1rem;
    margin: 1em 0;
    display: none;
}

#copy-button {
    background-color: #28a745;
    color: #fff;
    border: none;
    padding: 0.8em 2em;
    font-size: 1em;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#copy-button:hover {
    background-color: #218838;
}

.hidden-button {
    display: none;
}

/* 返回主页按钮样式 */
.home-button {
    position: fixed;
    top: 20px;
    left: 20px;
    background-color: #4CAF50;
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 14px;
    font-weight: bold;
    z-index: 1000;
    transition: all 0.3s ease;
}

.home-button:hover {
    background-color: #45a049;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 1.5em;
        margin-top: 50px;
    }
    
    .home-button {
        top: 10px;
        left: 10px;
        padding: 8px 16px;
        font-size: 12px;
    }
    
    .button-group {
        flex-direction: column;
        gap: 0.5em;
    }
    
    #json-input {
        min-height: 200px;
    }
}