body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 20px;
}

.chat-container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

h1 {
    text-align: center;
    color: #333;
    margin-top: 0;
}

.chat-box {
    height: 400px;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 10px;
    margin-bottom: 15px;
    background: #fafafa;
}

.message {
    margin-bottom: 10px;
    padding: 8px 12px;
    border-radius: 4px;
    background: #e3f2fd;
    display: inline-block;
    max-width: 70%;
    word-break: break-word;
}

.message.self {
    background: #c8e6c9;
    float: right;
}

.message-info {
    font-size: 12px;
    color: #666;
    margin-bottom: 3px;
}

.input-area {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.input-area input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.input-area button {
    padding: 10px 20px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.input-area button:hover {
    background: #45a049;
}

.notice {
    font-size: 12px;
    color: #777;
    text-align: center;
    margin-top: 10px;
}