body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.chat-container {
    width: 100%;
    max-width: 400px;
    height: 600px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    background-color: #4a90e2;
    color: white;
    padding: 15px;
    text-align: center;
}

.chat-box {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.message {
    padding: 10px 15px;
    border-radius: 10px;
    max-width: 80%;
    line-height: 1.4;
    font-size: 14px;
}

.bot-message {
    background-color: #e9ecef;
    color: #333;
    align-self: flex-start;
    border-bottom-left-radius: 2px;
}

.user-message {
    background-color: #4a90e2;
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 2px;
}

.input-area {
    display: flex;
    padding: 10px;
    border-top: 1px solid #ddd;
    background: #fff;
}

input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 20px;
    outline: none;
    margin-right: 10px;
}

button {
    padding: 10px 20px;
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
}

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

button:disabled {
    background-color: #ccc;
}