.chat-screen {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.chat-header {
  display: flex;
  align-items: center;
  height: var(--header-height);
  padding: 0 16px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.back-btn {
  display: none;
  margin-right: 8px;
  font-size: 1.2rem;
}

.chat-header-info {
  flex: 1;
  min-width: 0;
}

.chat-header-info .room-name {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-header-info .room-users {
  display: block;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.chat-header-actions {
  display: flex;
  gap: 4px;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.message {
  max-width: 75%;
  padding: 8px 12px;
  border-radius: var(--radius-lg);
  word-wrap: break-word;
  position: relative;
}

.message.incoming {
  align-self: flex-start;
  background: var(--bg-message-in);
  border-bottom-left-radius: 4px;
}

.message.outgoing {
  align-self: flex-end;
  background: var(--bg-message-out);
  border-bottom-right-radius: 4px;
}

.message-sender {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 2px;
}

.message-text {
  font-size: 0.9rem;
  line-height: 1.4;
  color: var(--text-primary);
}

.message-time {
  font-size: 0.68rem;
  color: var(--text-time);
  text-align: right;
  margin-top: 2px;
}

.message-system {
  align-self: center;
  background: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 4px 12px;
}

.typing-indicator {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 4px 16px;
  min-height: 20px;
}

.chat-input-area {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-header);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.chat-input-area input {
  flex: 1;
  padding: 10px 14px;
  background: var(--bg-input);
  border: none;
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
}

.chat-input-area input::placeholder {
  color: var(--text-muted);
}

.btn-send {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-round);
  background: var(--accent);
  border: none;
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  flex-shrink: 0;
}

.btn-send:hover {
  background: var(--accent-hover);
}