:root {
    --primary-color: #4a90e2;
    --background-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ddd;
}

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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

#chat-container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    overflow: hidden;
    margin-bottom: 20px;
}

#messages {
    height: 400px;
    overflow-y: auto;
    padding: 20px;
}

.message {
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 5px;
    max-width: 80%;
}

.user-message {
    background-color: var(--primary-color);
    color: white;
    margin-left: auto;
}

.bot-message {
    background-color: #f0f0f0;
    margin-right: auto;
}

#chat-form {
    display: flex;
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

#message-input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin-right: 10px;
}

button {
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #357abd;
}