/* Header: Judul Kiri, Tombol Close Kanan */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background-color: #1a1a1a;
    color: #fff;
    font-weight: bold;
}

/* Tombol Close */
.btn-close {
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
}

.btn-close:hover {
    color: #ff4d4d;
}