.course-chat-root {
  min-height: 0;
  overflow: hidden;
  padding: 0 !important;
}

.course-chat-shell {
  display: grid;
  grid-template-columns: minmax(15rem, 19rem) minmax(0, 1fr);
  height: clamp(38rem, calc(100dvh - 12rem), 52rem);
  min-height: 0;
  overflow: hidden;
}

.course-chat-sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
  border-right: 1px solid var(--border-color, #e5e7eb);
  background: #f8fafc;
}

.course-chat-sidebar-header,
.course-chat-header,
.course-chat-composer {
  padding: 1rem;
}

.course-chat-sidebar-header {
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-color, #e5e7eb);
}

.course-chat-sidebar-header strong,
.course-chat-header strong {
  display: block;
}

.course-chat-search,
.course-chat-composer textarea,
.course-chat-edit-input {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 0.65rem;
  background: #fff;
  color: #111827;
}

.course-chat-search {
  margin-top: 0.75rem;
  padding: 0.65rem 0.75rem;
}

.course-chat-admin-path {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.8rem;
  padding-left: 0.65rem;
  border-left: 3px solid #3157d5;
}

.course-chat-admin-path label {
  display: grid;
  gap: 0.25rem;
}

.course-chat-admin-path span {
  color: #475569;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.course-chat-admin-path select {
  width: 100%;
  min-width: 0;
  border: 1px solid #d1d5db;
  border-radius: 0.55rem;
  background: #fff;
  padding: 0.55rem 0.65rem;
  color: #111827;
}

.course-chat-admin-path select:disabled {
  background: #eef2f7;
  color: #94a3b8;
}

.course-chat-courses {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 0.5rem;
}

.course-chat-list-status {
  min-height: 1.1rem;
  margin: 0.55rem 0 0;
  color: #64748b;
  font-size: 0.75rem;
}

.course-chat-pagination {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  min-height: 3.25rem;
  border-top: 1px solid var(--border-color, #e5e7eb);
  padding: 0.55rem 0.75rem;
  color: #64748b;
  font-size: 0.78rem;
}

.course-chat-pagination:empty {
  display: none;
}

.course-chat-pagination button {
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  background: #fff;
  padding: 0.45rem 0.65rem;
  color: #3157d5;
  cursor: pointer;
}

.course-chat-pagination button:disabled {
  color: #94a3b8;
  cursor: default;
}

.course-chat-course {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  width: 100%;
  gap: 0.35rem 0.75rem;
  padding: 0.8rem;
  border: 0;
  border-radius: 0.7rem;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.course-chat-course:hover,
.course-chat-course.is-active {
  background: #e8efff;
}

.course-chat-course strong,
.course-chat-course small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-chat-course small {
  grid-column: 1 / -1;
  color: #64748b;
}

.course-chat-badge {
  min-width: 1.4rem;
  height: 1.4rem;
  padding: 0 0.35rem;
  border-radius: 999px;
  background: #3157d5;
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.4rem;
  text-align: center;
}

.course-chat-panel {
  display: flex;
  min-height: 0;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  background: #fff;
}

.course-chat-header {
  display: flex;
  flex-shrink: 0;
  min-height: 4.5rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--border-color, #e5e7eb);
}

.course-chat-header small,
.course-chat-message-meta,
.course-chat-typing,
.course-chat-empty p {
  color: #64748b;
}

.course-chat-live {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  white-space: nowrap;
}

.course-chat-live::before {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: #ef4444;
  content: "";
}

.course-chat-live.is-connected::before {
  background: #22c55e;
}

.course-chat-messages {
  display: flex;
  flex: 1 1 0;
  min-height: 0;
  flex-direction: column;
  gap: 0.75rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 1rem;
}

.course-chat-load-more {
  align-self: center;
  border: 1px solid #dbe3f3;
  border-radius: 999px;
  background: #fff;
  padding: 0.5rem 0.9rem;
  color: #3157d5;
  cursor: pointer;
}

.course-chat-message {
  align-self: flex-start;
  width: min(78%, 38rem);
}

.course-chat-message.is-own {
  align-self: flex-end;
}

.course-chat-bubble {
  border: 1px solid #e3e8f1;
  border-radius: 0.85rem 0.85rem 0.85rem 0.2rem;
  background: #f8fafc;
  padding: 0.7rem 0.85rem;
  overflow-wrap: anywhere;
}

.course-chat-message.is-own .course-chat-bubble {
  border-color: #c9d7ff;
  border-radius: 0.85rem 0.85rem 0.2rem 0.85rem;
  background: #eef3ff;
}

.course-chat-message-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.3rem;
  font-size: 0.72rem;
}

.course-chat-message-body {
  white-space: pre-wrap;
}

.course-chat-reply-preview,
.course-chat-replying {
  margin-bottom: 0.55rem;
  border-left: 3px solid #3157d5;
  border-radius: 0.3rem;
  background: rgb(49 87 213 / 8%);
  padding: 0.45rem 0.6rem;
  color: #475569;
  font-size: 0.8rem;
}

.course-chat-attachments {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.55rem;
}

.course-chat-attachment {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border: 0;
  border-radius: 0.5rem;
  background: rgb(49 87 213 / 10%);
  padding: 0.55rem 0.65rem;
  color: #284bbd;
  text-align: left;
  cursor: pointer;
}

.course-chat-attachments .voice-message {
  max-width: 100%;
}

.course-chat-message-actions {
  display: flex;
  gap: 0.55rem;
  margin-top: 0.3rem;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.course-chat-message:hover .course-chat-message-actions,
.course-chat-message:focus-within .course-chat-message-actions {
  opacity: 1;
}

.course-chat-message-actions button,
.course-chat-replying button {
  border: 0;
  background: transparent;
  padding: 0;
  color: #64748b;
  font-size: 0.75rem;
  cursor: pointer;
}

.course-chat-typing {
  flex-shrink: 0;
  min-height: 1.3rem;
  padding: 0 1rem;
  font-size: 0.78rem;
}

.course-chat-composer {
  flex-shrink: 0;
  border-top: 1px solid var(--border-color, #e5e7eb);
}

.course-chat-composer textarea {
  min-height: 4rem;
  resize: vertical;
  padding: 0.7rem;
}

.course-chat-composer-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.55rem;
}

.course-chat-composer-actions button,
.course-chat-file-label {
  border: 1px solid #d1d5db;
  border-radius: 0.55rem;
  background: #fff;
  padding: 0.55rem 0.75rem;
  color: #334155;
  cursor: pointer;
}

.course-chat-composer-actions [data-chat-send] {
  margin-left: auto;
  border-color: #3157d5;
  background: #3157d5;
  color: #fff;
}

.course-chat-file-label input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
}

.course-chat-empty,
.course-chat-state {
  display: grid;
  flex: 1;
  place-content: center;
  padding: 2rem;
  text-align: center;
}

.course-chat-state button {
  justify-self: center;
  margin-top: 0.75rem;
}

@media (max-width: 760px) {
  .course-chat-shell {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(9rem, 14rem) minmax(0, 1fr);
    height: clamp(42rem, calc(100dvh - 7rem), 54rem);
  }

  .course-chat-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border-color, #e5e7eb);
  }

  .course-chat-panel {
    min-height: 0;
  }

  .course-chat-message {
    width: 92%;
  }
}