body {
    font-family: Arial, sans-serif;
    background-color: #f4f9f9;
    margin: 0;
    display: flex;
}

.sidebar {
    width: 250px;
    background-color: #2c3e50;
    color: white;
    padding: 20px;
    height: 100vh;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar h3 {
    margin-top: 0;
}

.sidebar ul {
    list-style-type: none;
    padding: 0;
}

.sidebar ul li {
    padding: 10px;
    margin: 5px 0;
    background-color: #34495e;
    cursor: pointer;
    border-radius: 4px;
}

.sidebar ul li:hover {
    background-color: #1abc9c;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    animation: slideIn 0.5s ease-in-out;
}

@keyframes slideIn {
    from { transform: translateX(100px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.chat-box {
    flex: 1;
    overflow-y: auto;
    border: 1px solid #ccc;
    padding: 15px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.chat-input {
    margin-top: 10px;
    display: flex;
}

.chat-input input {
    flex: 1;
    padding: 12px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.chat-input button {
    padding: 12px 18px;
    background-color: #2ecc71;
    color: white;
    border: none;
    border-radius: 4px;
    margin-left: 5px;
    cursor: pointer;
}

.message {
    margin: 12px 0;
    padding: 12px;
    border-radius: 10px;
    animation: fadeIn 0.4s ease-in-out;
    font-size: 18px;
    line-height: 1.4;
    max-width: 80%;
}

.user {
    background-color: #dfefff;
    align-self: flex-end;
    text-align: right;
    color: #2980b9;
}

.bot {
    background-color: #e6ffe9;
    align-self: flex-start;
    color: #27ae60;
    text-align: left;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}