/* Chat viewport behavior: long histories scroll inside the room, composer stays reachable. */

.bk-chat-room-card,
.bk-chat-layout {
  min-height: 0;
}

.bk-chat-layout {
  align-items: stretch;
}

.bk-chat-thread {
  min-height: 0;
  max-height: min(68vh, 760px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 4px;
  scroll-behavior: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.bk-chat-thread::-webkit-scrollbar {
  width: 8px;
}

.bk-chat-thread::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(148, 163, 184, .22);
}

.bk-chat-history-toolbar {
  position: sticky;
  top: 0;
  z-index: 3;
  background: rgba(15, 23, 42, .9);
  backdrop-filter: blur(14px);
}

.bk-chat-pinned-summary {
  max-height: 118px;
  overflow: hidden;
}

.bk-chat-pinned-summary p,
.bk-chat-reply-context p {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.bk-chat-pinned-summary p {
  -webkit-line-clamp: 3;
}

.bk-chat-reply-context p {
  -webkit-line-clamp: 2;
}

.bk-chat-date-divider,
.bk-chat-unread-divider {
  position: sticky;
  top: 112px;
  z-index: 2;
  padding-block: 3px;
}

.bk-chat-message-card {
  overflow: hidden;
}

.bk-chat-message-card .bk-card-body,
.bk-chat-message-card .bk-card-body p {
  overflow-wrap: anywhere;
}

.bk-chat-message-card .bk-card-body {
  max-height: 210px;
  overflow: hidden;
}

.bk-chat-composer-card {
  position: sticky;
  bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  z-index: 4;
  border-color: rgba(96, 165, 250, .2);
  background: rgba(8, 14, 24, .92);
  backdrop-filter: blur(18px);
  box-shadow: 0 -16px 44px rgba(0, 0, 0, .22);
}

.bk-chat-composer-card .bk-textarea {
  max-height: 160px;
  resize: vertical;
}

.bk-chat-reply-context {
  max-height: 112px;
  overflow: hidden;
}

.bk-chat-attachment-grid,
.bk-chat-attachment-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  max-height: 180px;
  overflow: hidden;
}

.bk-chat-attachment-chip {
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid rgba(148, 163, 184, .18);
  border-radius: var(--bk-radius-control);
  background: rgba(15, 23, 42, .44);
  overflow-wrap: anywhere;
}

@media (max-width: 767px) {
  .bk-chat-thread {
    max-height: min(62vh, 620px);
    padding-right: 0;
  }

  .bk-chat-date-divider,
  .bk-chat-unread-divider {
    top: 104px;
  }

  .bk-chat-composer-card {
    bottom: calc(74px + env(safe-area-inset-bottom, 0px));
  }

  .bk-chat-composer-card .bk-textarea {
    max-height: 120px;
  }

  .bk-chat-attachment-grid,
  .bk-chat-attachment-list {
    grid-template-columns: minmax(0, 1fr);
  }
}