.chat-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: var(--header-height);
  padding: 0 var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  flex-shrink: 0;
}

.chat-title {
  font-size: 15.5px;
  font-weight: 600;
}

.chat-subtitle {
  font-size: 12.5px;
  color: var(--color-ink-faint);
  margin-top: 1px;
}

.chat-window {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.chat-empty {
  margin: auto;
  text-align: center;
  max-width: 380px;
  color: var(--color-ink-faint);
  animation: rise 0.25s ease;
}

.chat-empty-icon {
  font-size: 30px;
  margin-bottom: var(--space-3);
}

.chat-empty-title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-2);
}

.chat-empty-hint {
  font-size: 13.5px;
  line-height: 1.55;
}

.message {
  display: flex;
  flex-direction: column;
  max-width: 68%;
  animation: rise 0.2s ease;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message--user {
  align-self: flex-end;
  align-items: flex-end;
}

.message--assistant {
  align-self: flex-start;
  align-items: flex-start;
}

.bubble {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: 14.5px;
  line-height: 1.55;
  word-break: break-word;
}

.message--user .bubble {
  background: linear-gradient(135deg, var(--color-deep-blue) 0%, var(--color-deep-blue-dark) 100%);
  color: var(--color-ink);
  border-bottom-right-radius: var(--radius-sm);
}

.message--assistant .bubble {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  color: var(--color-ink);
  box-shadow: var(--shadow-sm);
  border-bottom-left-radius: var(--radius-sm);
}

.message--error .bubble {
  background: var(--color-danger-soft);
  border: 1px solid transparent;
  color: var(--color-danger);
}

.bubble p {
  margin: 0 0 var(--space-2);
  white-space: pre-wrap;
}

.bubble p:last-child {
  margin-bottom: 0;
}

.bubble ul,
.bubble ol {
  margin: var(--space-2) 0;
  padding-left: 22px;
}

.bubble li {
  margin-bottom: 4px;
}

.bubble code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(0, 0, 0, 0.28);
  padding: 1px 6px;
  border-radius: 5px;
}

.bubble pre {
  background: rgba(0, 0, 0, 0.32);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: var(--space-2) 0;
}

.bubble pre code {
  background: none;
  padding: 0;
}

.thinking-bubble {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: var(--space-3) var(--space-4);
}

.thinking-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse 1.1s ease-in-out infinite;
}

.thinking-dot:nth-child(2) {
  animation-delay: 0.15s;
}

.thinking-dot:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes pulse {
  0%,
  60%,
  100% {
    opacity: 0.35;
    transform: scale(0.85);
  }
  30% {
    opacity: 1;
    transform: scale(1);
  }
}

.sources {
  margin-top: var(--space-2);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.source-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  border-left: 2px solid var(--color-accent);
  color: var(--color-ink-soft);
}

.source-chip-icon {
  font-size: 11px;
}

.chat-input-row {
  display: flex;
  align-items: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  flex-shrink: 0;
}

.chat-textarea {
  flex: 1;
  resize: none;
  max-height: 140px;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  line-height: 1.4;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.chat-textarea::placeholder {
  color: var(--color-ink-faint);
}

.chat-textarea:focus-visible {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
  outline: none;
}

.btn-send {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 16px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
}

.btn-send:hover:not(:disabled) {
  background: var(--color-accent-dark);
  box-shadow: var(--shadow-glow);
}

.btn-send:active:not(:disabled) {
  transform: scale(0.94);
}