/* リセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f5f5;
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.container {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 20px;
}

h1 {
    color: #333;
    margin-bottom: 20px;
    font-size: 24px;
}

.chat-area {
    height: 500px;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 15px;
    margin-bottom: 20px;
    background-color: #fafafa;
}

.message {
    margin-bottom: 15px;
    padding: 12px 16px;
    border-radius: 8px;
    max-width: 80%;
    word-wrap: break-word;
    line-height: 1.5;
}

.user-message {
    background-color: #007bff;
    color: white;
    margin-left: auto;
    text-align: right;
}

.ai-message {
    background-color: #e9ecef;
    color: #333;
}

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

#messageInput {
    flex: 1;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    font-family: inherit;
}

#messageInput:focus {
    outline: none;
    border-color: #007bff;
}

#sendButton {
    padding: 12px 24px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    font-family: inherit;
}

#sendButton:hover {
    background-color: #0056b3;
}

#sendButton:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.loading {
    color: #666;
    font-style: italic;
}

/* レスポンシブ対応 */
@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 15px;
    }
    
    .chat-area {
        height: 400px;
    }
    
    .message {
        max-width: 90%;
    }
}