/* Chat nội bộ — Components/Chat */
.chat-shell {
    display: grid;
    grid-template-columns: 320px 1fr;
    height: calc(100vh - 190px);
    min-height: 420px;
    border: 1px solid var(--mud-palette-lines-default);
    border-radius: 8px;
    overflow: hidden;
    background: var(--mud-palette-surface);
}

/* ---- Danh sách hội thoại ---- */
.chat-sidebar {
    display: flex;
    flex-direction: column;
    min-height: 0;
    border-right: 1px solid var(--mud-palette-lines-default);
}
.chat-sidebar__head {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid var(--mud-palette-lines-default);
}
.chat-sidebar__list {
    flex: 1;
    overflow-y: auto;
}
.chat-conv {
    display: flex;
    gap: 10px;
    align-items: center;
    width: 100%;
    padding: 10px 12px;
    border: 0;
    background: transparent;
    text-align: left;
    cursor: pointer;
}
.chat-conv:hover { background: var(--mud-palette-action-default-hover); }
.chat-conv--active { background: var(--mud-palette-primary-hover); }
.chat-conv__body { flex: 1; min-width: 0; }
.chat-conv__top { display: flex; justify-content: space-between; gap: 6px; }
.chat-conv__name {
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.chat-conv--unread .chat-conv__name,
.chat-conv--unread .chat-conv__preview { font-weight: 700; color: var(--mud-palette-text-primary); }
.chat-conv__time { font-size: 0.75rem; color: var(--mud-palette-text-secondary); white-space: nowrap; }
.chat-conv__bottom { display: flex; justify-content: space-between; align-items: center; gap: 6px; }
.chat-conv__preview {
    font-size: 0.85rem;
    color: var(--mud-palette-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.chat-unread {
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    border-radius: 10px;
    background: var(--mud-palette-error);
    color: #fff;
    font-size: 0.75rem;
    line-height: 20px;
    text-align: center;
}
.chat-avatar {
    flex: none;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--mud-palette-primary);
    color: var(--mud-palette-primary-text);
    font-weight: 600;
}
.chat-avatar--group { background: var(--mud-palette-secondary); color: var(--mud-palette-secondary-text); }

/* ---- Khung tin nhắn ---- */
.chat-pane { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.chat-pane__head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-bottom: 1px solid var(--mud-palette-lines-default);
}
.chat-pane__title { flex: 1; min-width: 0; }
.chat-pane__search { padding: 8px 12px; border-bottom: 1px solid var(--mud-palette-lines-default); }
.chat-search-results { max-height: 240px; overflow-y: auto; }
.chat-search-hit { display: block; width: 100%; padding: 6px 4px; border: 0; background: transparent; text-align: left; cursor: pointer; }
.chat-search-hit:hover { background: var(--mud-palette-action-default-hover); }
.chat-messages { flex: 1; overflow-y: auto; padding: 12px 16px; background: var(--mud-palette-background-grey); }
.chat-empty {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--mud-palette-text-secondary);
    text-align: center;
    padding: 24px;
}
.chat-day { text-align: center; margin: 12px 0; }
.chat-day span {
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 10px;
    background: var(--mud-palette-surface);
    color: var(--mud-palette-text-secondary);
}
.chat-system { text-align: center; font-size: 0.8rem; color: var(--mud-palette-text-secondary); margin: 8px 0; }

.chat-msg { display: flex; flex-direction: column; align-items: flex-start; margin: 2px 0; }
.chat-msg--mine { align-items: flex-end; }
.chat-msg__sender { font-size: 0.75rem; color: var(--mud-palette-text-secondary); margin: 8px 0 2px 4px; }
.chat-msg__bubble {
    max-width: min(70%, 640px);
    padding: 8px 12px;
    border-radius: 14px;
    background: var(--mud-palette-surface);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.06);
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}
.chat-msg--mine .chat-msg__bubble { background: var(--mud-palette-primary); color: var(--mud-palette-primary-text); }
.chat-msg__row { display: flex; align-items: center; gap: 4px; width: 100%; }
/* Tin của mình: thanh thao tác nằm bên trái bubble. */
.chat-msg--mine .chat-msg__row { flex-direction: row-reverse; justify-content: flex-start; }
.chat-msg__actions { display: flex; align-items: center; gap: 2px; visibility: hidden; }
.chat-msg__action-btn .mud-icon-button { padding: 4px; }
.chat-msg__actions .mud-icon-button { padding: 4px; color: var(--mud-palette-text-secondary); }
.chat-msg__row:hover .chat-msg__actions,
.chat-msg__actions:focus-within { visibility: visible; }
.chat-msg__forwarded { font-size: 0.75rem; font-style: italic; opacity: 0.8; margin-bottom: 2px; }
.chat-quote {
    display: block;
    width: 100%;
    margin-bottom: 4px;
    padding: 4px 8px;
    border: 0;
    border-left: 3px solid var(--mud-palette-secondary);
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.06);
    color: inherit;
    text-align: left;
    cursor: pointer;
    white-space: normal;
}
.chat-msg--mine .chat-quote { background: rgba(255, 255, 255, 0.18); border-left-color: rgba(255, 255, 255, 0.8); }
.chat-quote__sender { display: block; font-size: 0.75rem; font-weight: 600; }
.chat-quote__text {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 0.8rem;
    opacity: 0.85;
}
.chat-msg__bubble--recalled,
.chat-msg--mine .chat-msg__bubble--recalled {
    background: transparent;
    color: var(--mud-palette-text-secondary);
    border: 1px dashed var(--mud-palette-lines-default);
    font-style: italic;
    box-shadow: none;
}
.chat-msg__meta { font-size: 0.7rem; color: var(--mud-palette-text-secondary); margin: 2px 6px 0; display: flex; gap: 4px; align-items: center; }
.chat-msg--flash .chat-msg__bubble { outline: 3px solid var(--mud-palette-warning); }
.chat-msg__image { display: block; max-width: 280px; max-height: 240px; border-radius: 10px; cursor: zoom-in; }
.chat-file {
    display: flex;
    gap: 10px;
    align-items: center;
    color: inherit;
    text-decoration: none;
    min-width: 200px;
}
.chat-file__name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 260px; }
.chat-file__size { font-size: 0.75rem; opacity: 0.8; }
.chat-load-older { text-align: center; margin-bottom: 8px; }

/* ---- Thanh tin ghim ---- */
.chat-pins { border-bottom: 1px solid var(--mud-palette-lines-default); background: var(--mud-palette-surface); }
.chat-pin {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px;
}
.chat-pin__body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    border: 0;
    background: transparent;
    text-align: left;
    cursor: pointer;
    color: inherit;
    padding: 2px 0;
}
.chat-pin__sender { display: block; font-size: 0.75rem; font-weight: 600; color: var(--mud-palette-primary); }
.chat-pin__text {
    display: block;
    max-width: 100%;
    font-size: 0.85rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ---- Thanh "Đang trả lời" trên ô nhập ---- */
.chat-replying {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 12px;
    padding: 4px 8px;
    border-left: 3px solid var(--mud-palette-primary);
    border-radius: 4px;
    background: var(--mud-palette-background-grey);
}
.chat-replying--edit { border-left-color: var(--mud-palette-warning); }
.chat-replying__body { flex: 1; min-width: 0; }
.chat-replying__text { font-size: 0.8rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--mud-palette-text-secondary); }

.chat-typing { min-height: 20px; padding: 0 16px; font-size: 0.8rem; font-style: italic; color: var(--mud-palette-text-secondary); }

/* ---- Ô nhập ---- */
.chat-composer {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    padding: 8px 12px;
    border-top: 1px solid var(--mud-palette-lines-default);
}
.chat-composer textarea {
    flex: 1;
    resize: none;
    min-height: 40px;
    max-height: 160px;
    padding: 9px 12px;
    border: 1px solid var(--mud-palette-lines-inputs);
    border-radius: 20px;
    font: inherit;
    background: var(--mud-palette-surface);
    color: var(--mud-palette-text-primary);
    outline: none;
}
.chat-composer textarea:focus { border-color: var(--mud-palette-primary); }
.chat-composer__file { display: none; }

/* Màn hình cảm ứng không có hover: luôn hiện ↩ và ⋮. */
@media (hover: none) {
    .chat-msg__actions { visibility: visible; }
}

@media (max-width: 900px) {
    .chat-shell { grid-template-columns: 1fr; }
    .chat-shell--has-selection .chat-sidebar { display: none; }
    .chat-shell:not(.chat-shell--has-selection) .chat-pane { display: none; }
}