body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
#chat-container {
    width: 75%;
    height: 600px;
    background: white;
    border-radius: 12px;
    border-style: dashed;
    border-width: 1px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
#chat-header {
    background: #007bff;
    color: white;
    padding: 15px;
    font-weight: bold;
    font-size: 1.1em;
    text-align: center;
}
#chat-messages {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.message {
    max-width: 75%;
    padding: 10px 14px;
    border-radius: 15px;
    font-size: 0.95em;
    line-height: 1.4;
}
.message.bot {
    background: #e9ecef;
    color: #333;
    align-self: flex-start;
    border-top-left-radius: 2px;
}
.message.user {
    background: #007bff;
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 2px;
}
#chat-input-area {
    display: flex;
    padding: 10px;
    border-top: 1px solid #dee2e6;
    background: #fff;
}
#user-input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 20px;
    background-color: #f0fff0;
    outline: none;
    font-size: 0.95em;
}
#send-btn {
    background: #007bff;
    color: white;
    border: none;
    padding: 0 15px;
    margin-left: 8px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
}
#send-btn:hover {
    background: #0056b3;
}