#matrix-panel {
  position: fixed;
  top: 10px;
  right: 10px;
  bottom: 10px;
  width: min(520px, calc(100vw - 20px));
  z-index: 1800;
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.98);
  border-radius: 12px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

#matrix-panel.hidden {
  display: none;
}

.matrix-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid #d8d8d8;
  font-weight: 700;
  font-size: 18px;
}

.matrix-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.matrix-status {
  font-size: 12px;
  font-weight: 600;
  color: #666;
}

#matrix-close {
  border: none;
  background: transparent;
  font-size: 24px;
  cursor: pointer;
  line-height: 1;
}

.matrix-layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 170px 1fr;
}

.matrix-rooms {
  overflow-y: auto;
  border-right: 1px solid #ddd;
  background: #f5f5f5;
}

.matrix-room-button {
  width: 100%;
  border: 0;
  border-bottom: 1px solid #ddd;
  background: transparent;
  padding: 12px 10px;
  text-align: left;
  cursor: pointer;
  font-size: 14px;
}

.matrix-room-button.active {
  background: #fff;
  font-weight: 700;
}

.matrix-chat {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.matrix-room-title {
  padding: 9px 12px;
  border-bottom: 1px solid #ddd;
  font-weight: 700;
}

.matrix-messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: #fff;
}

.matrix-message {
  max-width: 85%;
  padding: 8px 10px;
  border-radius: 10px;
  background: #efefef;
  align-self: flex-start;
  word-break: break-word;
}

.matrix-message.own {
  align-self: flex-end;
  background: #dcecff;
}

.matrix-message-meta {
  display: block;
  margin-bottom: 3px;
  font-size: 11px;
  color: #666;
}

.matrix-compose {
  flex: 0 0 auto;
  display: flex;
  gap: 8px;
  padding: 10px;
  padding-bottom: max(10px, env(safe-area-inset-bottom));
  border-top: 1px solid #ddd;
  background: #fafafa;
}

.matrix-compose input {
  flex: 1;
  min-width: 0;
  padding: 10px;
  border: 1px solid #bbb;
  border-radius: 8px;
  font-size: 15px;
}

.matrix-compose button {
  min-width: 48px;
  border: 0;
  border-radius: 8px;
  font-size: 20px;
  cursor: pointer;
}

.matrix-empty {
  color: #777;
  font-size: 14px;
}

@media (max-width: 600px) {
  #matrix-panel {
    inset: 0;
    width: 100vw;
    height: 100dvh;
    max-height: 100dvh;
    border-radius: 0;
  }

  .matrix-header {
    flex: 0 0 auto;
    padding: 8px 10px;
    font-size: 16px;
  }

  .matrix-header-actions {
    gap: 6px;
  }

  .matrix-status {
    max-width: 46vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 11px;
  }

  .matrix-layout {
    min-height: 0;
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr);
  }

  .matrix-rooms {
    display: flex;
    flex: 0 0 auto;
    max-height: 92px;
    overflow-x: auto;
    overflow-y: hidden;
    border-right: 0;
    border-bottom: 1px solid #ddd;
    white-space: nowrap;
  }

  .matrix-room-button {
    width: auto;
    min-width: max-content;
    padding: 9px 12px;
    border-bottom: 0;
    border-right: 1px solid #ddd;
  }

  .matrix-chat {
    min-height: 0;
  }

  .matrix-room-title {
    flex: 0 0 auto;
    padding: 7px 10px;
  }

  .matrix-messages {
    padding: 8px;
  }

  .matrix-compose {
    padding: 8px;
    padding-bottom: max(8px, env(safe-area-inset-bottom));
  }

  .matrix-compose input {
    padding: 9px;
    font-size: 16px;
  }
}