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

.chat-container {
    width: 100%;
    max-width: 600px;
    height: 90vh;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    background-color: #4a90e2;
    color: #fff;
    padding: 15px 20px;
    text-align: center;
    border-bottom: 1px solid #ddd;
}

.chat-header h2 {
    margin: 0;
    font-size: 1.4em;
}

.chat-header p {
    margin: 5px 0 0;
    font-size: 0.9em;
    opacity: 0.9;
}

.chat-box {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    max-width: 80%;
    padding: 10px 15px;
    border-radius: 18px;
    line-height: 1.5;
    animation: fadeIn 0.5s ease-in-out;
    word-wrap: break-word;
}

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

.bot-message {
    background-color: #e9e9eb;
    color: #333;
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.bot-message.loading p::after {
    content: '...';
    display: inline-block;
    animation: typing 1s infinite;
}

@keyframes typing {
    0% { content: '.'; }
    33% { content: '..'; }
    66% { content: '...'; }
}

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

.default-questions {
    padding: 10px 20px;
    border-top: 1px solid #ddd;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.default-question-btn {
    background-color: #f0f2f5;
    border: 1px solid #ccc;
    border-radius: 15px;
    padding: 8px 12px;
    font-size: 0.9em;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s;
}

.default-question-btn:hover {
    background-color: #e0e4e8;
    border-color: #4a90e2;
}

.chat-input {
    display: flex;
    padding: 15px;
    border-top: 1px solid #ddd;
    background-color: #f9f9f9;
}

#user-input {
    flex-grow: 1;
    border: 1px solid #ccc;
    border-radius: 20px;
    padding: 10px 15px;
    font-size: 1em;
    outline: none;
    transition: border-color 0.3s;
}

#user-input:focus {
    border-color: #4a90e2;
}

#send-btn {
    background-color: #4a90e2;
    color: #fff;
    border: none;
    border-radius: 20px;
    padding: 10px 20px;
    margin-left: 10px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    transition: background-color 0.3s;
}

#send-btn:hover {
    background-color: #357abd;
}