.dag-chat {
  --chat-bg: #f3f6f8;
  --chat-panel: #ffffff;
  --chat-border: #d9e2e8;
  --chat-ink: #193244;
  --chat-muted: #6f7f8b;
  --chat-accent: #2d6a91;
  --chat-accent-soft: #dcecf7;
  --chat-bubble: #e9eef2;
  margin-top: 0.5rem;
}

.dag-chat-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 1.5rem;
  align-items: stretch;
}

.dag-chat-login,
.dag-chat-main,
.dag-chat-sidebar {
  background: var(--chat-panel);
  border: 1px solid var(--chat-border);
  border-radius: 24px;
}

.dag-chat-room-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: 1.4rem 1.5rem 1rem;
  border-bottom: 1px solid var(--chat-border);
}

.dag-chat-room-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--chat-ink);
}

.dag-chat-room-subtitle {
  color: var(--chat-muted);
  font-size: 0.92rem;
  margin-top: 0.2rem;
}

.dag-chat-messages {
  height: 540px;
  overflow: auto;
  padding: 1.5rem;
  background:
    linear-gradient(180deg, rgba(243, 246, 248, 0.95), rgba(243, 246, 248, 0.7)),
    repeating-linear-gradient(
      180deg,
      transparent,
      transparent 27px,
      rgba(217, 226, 232, 0.45) 28px
    );
}

.dag-chat-empty {
  color: var(--chat-muted);
  text-align: center;
  padding: 2.5rem 1rem;
}

.dag-chat-message {
  max-width: min(80%, 620px);
  margin-bottom: 0.9rem;
  padding: 0.9rem 1rem;
  border-radius: 18px 18px 18px 6px;
  background: var(--chat-bubble);
  color: var(--chat-ink);
  box-shadow: 0 10px 20px rgba(25, 50, 68, 0.05);
}

.dag-chat-message.is-mine {
  margin-left: auto;
  border-radius: 18px 18px 6px 18px;
  background: var(--chat-accent-soft);
}

.dag-chat-message-meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  font-size: 0.8rem;
  color: var(--chat-muted);
  margin-bottom: 0.35rem;
}

.dag-chat-message-body {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.55;
}

.dag-chat-composer {
  border-top: 1px solid var(--chat-border);
  padding: 1rem 1.5rem 1.5rem;
  background: #fbfcfd;
  border-radius: 0 0 24px 24px;
}

.dag-chat-composer textarea {
  min-height: 96px;
  resize: vertical;
}

.dag-chat-composer-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 0.9rem;
}

.dag-chat-feedback {
  min-height: 1.2rem;
}

.dag-chat-participants {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.dag-chat-participant {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  padding: 0.9rem 0;
  border-bottom: 1px solid rgba(217, 226, 232, 0.7);
}

.dag-chat-participant:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.dag-chat-participant-name {
  font-weight: 600;
  color: var(--chat-ink);
}

.dag-chat-participant-name-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.dag-chat-participant-indicator {
  width: 10px;
  height: 10px;
  flex: 0 0 10px;
  border-radius: 999px;
  background: #c04747;
  box-shadow: 0 0 0 3px rgba(192, 71, 71, 0.12);
}

.dag-chat-participant-indicator.is-online {
  background: #2c8c53;
  box-shadow: 0 0 0 3px rgba(44, 140, 83, 0.12);
}

.dag-chat-participant-indicator.is-offline {
  background: #c04747;
  box-shadow: 0 0 0 3px rgba(192, 71, 71, 0.12);
}

.dag-chat-participant-meta {
  color: var(--chat-muted);
  font-size: 0.84rem;
  margin-top: 0.15rem;
}

@media (max-width: 991.98px) {
  .dag-chat-shell {
    grid-template-columns: 1fr;
    display: grid;
  }

  .dag-chat-messages {
    height: 420px;
  }
}

@media (max-width: 575.98px) {
  .dag-chat-room-header,
  .dag-chat-composer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .dag-chat-messages {
    padding: 1rem;
    height: 360px;
  }

  .dag-chat-message {
    max-width: 92%;
  }

  .dag-chat-composer-actions {
    flex-direction: column;
    align-items: stretch;
  }
}