.container {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(to right, #d4fc79, #96e6a1);
    padding: 30px;
    border-radius: 20px;
    max-width: 800px;
    margin: 40px auto;
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
}
header h1 {
    font-size: 2.5rem;
    color: #2d3748;
    margin-bottom: 10px;
}
header p {
    font-size: 1.1rem;
    color: #4a5568;
}
.chat-window {
    background-color: #ffffff;
    padding: 20px;
    border-radius: 15px;
    height: 400px;
    overflow-y: auto;
    margin: 20px 0;
    border: 1px solid #e2e8f0;
}
.chat-message {
    display: flex;
    margin-bottom: 15px;
}
.chat-message.user { justify-content: flex-end; }
.chat-message.ai { justify-content: flex-start; }
.message-bubble {
    max-width: 70%;
    padding: 12px 18px;
    border-radius: 20px;
    font-size: 0.95rem;
    line-height: 1.4;
}
.user .message-bubble {
    background-color: #319795;
    color: #ffffff;
}
.ai .message-bubble {
    background-color: #f1f5f9;
    color: #1a202c;
    border: 1px solid #cbd5e0;
}
.chat-input {
    display: flex;
    gap: 10px;
}
.chat-input input {
    flex-grow: 1;
    padding: 12px 15px;
    border-radius: 25px;
    border: 1px solid #cbd5e0;
    font-size: 1rem;
}
.chat-input button {
    padding: 12px 20px;
    background-color: #319795;
    color: white;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}
.chat-input button:hover {
    background-color: #2c7a7b;
}
footer {
    margin-top: 30px;
    text-align: center;
    font-size: 0.9rem;
    color: #2d3748;
}