body {
    background: #181818;
    color: #f1f1f1;
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
}
.chat-container {
    max-width: 420px;
    margin: 40px auto;
    background: #232323;
    border-radius: 12px;
    box-shadow: 0 4px 24px #000a;
    padding: 0 0 16px 0;
}
.chat-box {
    min-height: 320px;
    max-height: 420px;
    overflow-y: auto;
    padding: 18px 16px 8px 16px;
    border-bottom: 1px solid #333;
}
.message {
    margin-bottom: 12px;
    line-height: 1.5;
}
.message.user {
    text-align: right;
    color: #7ecfff;
}
.message.bot {
    text-align: left;
    color: #f1f1f1;
}
#chat-form {
    display: flex;
    padding: 12px 16px 0 16px;
    gap: 8px;
}
#user-input {
    flex: 1;
    padding: 8px 12px;
    border-radius: 6px;
    border: none;
    font-size: 1em;
    background: #222;
    color: #fff;
}
#user-input:focus {
    outline: 2px solid #7ecfff;
}
button[type="submit"] {
    background: linear-gradient(90deg, #7ecfff, #4e54c8);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 8px 18px;
    font-size: 1em;
    cursor: pointer;
    transition: background 0.2s;
}
button[type="submit"]:hover {
    background: linear-gradient(90deg, #4e54c8, #7ecfff);
}
@media (max-width: 600px) {
    .chat-container {
        max-width: 100vw;
        margin: 0;
        border-radius: 0;
        box-shadow: none;
    }
    #chat-form {
        padding: 12px 8px 0 8px;
    }
    .chat-box {
        padding: 18px 8px 8px 8px;
    }
}