body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #e5ddd5;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.chat-container {
    width: 100%;
    max-width: 400px;
    height: 100vh; /* মোবাইলের জন্য ফুল হাইট */
    background: white;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 15px rgba(0,0,0,0.2);
}

@media (min-width: 768px) {
    .chat-container {
        height: 600px;
        border-radius: 15px;
        overflow: hidden;
    }
}

.chat-header {
    background: #075e54;
    color: white;
    padding: 15px;
    text-align: center;
}

.chat-body {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #e5ddd5;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.bot-msg, .user-msg {
    padding: 10px 15px;
    border-radius: 20px;
    max-width: 75%;
    font-size: 14px;
    line-height: 1.4;
}

.bot-msg {
    background: white;
    align-self: flex-start;
    border-bottom-left-radius: 0;
}

.user-msg {
    background: #dcf8c6;
    align-self: flex-end;
    border-bottom-right-radius: 0;
}

.chat-input {
    padding: 10px;
    background: #f0f0f0;
    display: flex;
    gap: 10px;
}

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

button {
    padding: 10px 20px;
    background: #075e54;
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
}