/* ============================================================
   Chat Component — main chat panel, messages, composer
   ============================================================ */

/* ── Chat Layout ─────────────────────────────────────────── */
.chat-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background: var(--color-bg);
}

/* ── Topbar ──────────────────────────────────────────────── */
.chat-topbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  backdrop-filter: blur(8px);
  min-height: 56px;
  flex-shrink: 0;
}

.chat-topbar-title {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.model-selector {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  transition: all var(--duration-fast) var(--ease-in-out);
}
.model-selector:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text);
  border-color: var(--color-text-subtle);
}

/* ── Messages Area ───────────────────────────────────────── */
.messages-area {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  scroll-behavior: smooth;
}

/* ── Welcome Screen ──────────────────────────────────────── */
.welcome-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  padding: var(--space-12) var(--space-4);
  text-align: center;
}

.welcome-logo {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--color-brand-500), var(--color-accent-400));
  border-radius: var(--radius-2xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: var(--shadow-glow), var(--shadow-lg);
  animation: logo-float 3s ease-in-out infinite;
}

@keyframes logo-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.welcome-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  background: linear-gradient(135deg, var(--color-text), var(--color-brand-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 400px;
}

.suggestion-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  max-width: 480px;
  width: 100%;
}

.suggestion-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  cursor: pointer;
  text-align: left;
  transition: all var(--duration-normal) var(--ease-out);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.suggestion-card:hover {
  border-color: var(--color-primary);
  background: var(--color-brand-50);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
[data-theme="dark"] .suggestion-card:hover {
  background: hsl(248, 80%, 56%, 0.1);
}

.suggestion-icon { font-size: 1.25rem; }
.suggestion-text {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: var(--font-medium);
  line-height: var(--leading-tight);
}

/* ── Message Bubbles ─────────────────────────────────────── */
.message-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.message {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: var(--font-semibold);
  overflow: hidden;
}

.message-avatar.user-avatar {
  background: linear-gradient(135deg, var(--color-brand-500), var(--color-accent-400));
  color: white;
}

.message-avatar.ai-avatar {
  background: linear-gradient(135deg, var(--color-brand-600), var(--color-brand-400));
  color: white;
}

.message-content {
  flex: 1;
  min-width: 0;
}

.message-role {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.message-text {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  word-break: break-word;
}

.message-text p { margin-bottom: var(--space-3); }
.message-text p:last-child { margin-bottom: 0; }

/* Code blocks inside messages */
.message-text pre {
  position: relative;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin: var(--space-3) 0;
  overflow-x: auto;
}

.code-copy-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  opacity: 0;
  transition: opacity var(--duration-fast);
}
.message-text pre:hover .code-copy-btn { opacity: 1; }

/* Inline code */
.message-text code:not(pre code) {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.3em;
  font-size: 0.85em;
}

.message-actions {
  display: flex;
  gap: var(--space-1);
  margin-top: var(--space-2);
  opacity: 0;
  transition: opacity var(--duration-fast);
}
.message:hover .message-actions { opacity: 1; }

/* ── Citations ───────────────────────────────────────────── */
.citations-block {
  margin-top: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  border-left: 3px solid var(--color-primary);
}

.citations-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.citation-item {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
  padding: var(--space-2) 0;
  border-top: 1px solid var(--color-border-subtle);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.citation-item:first-of-type { border-top: none; }

.citation-index {
  width: 18px;
  height: 18px;
  background: var(--color-brand-100);
  color: var(--color-brand-700);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-semibold);
  flex-shrink: 0;
  font-size: 10px;
}
[data-theme="dark"] .citation-index {
  background: hsl(248, 30%, 25%);
  color: var(--color-brand-300);
}

/* ── Typing Indicator ────────────────────────────────────── */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: var(--space-3) 0;
  align-items: center;
}
.typing-dot {
  width: 6px;
  height: 6px;
  background: var(--color-text-muted);
  border-radius: 50%;
  animation: typing-bounce 1.2s ease-in-out infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}

/* ── Composer ────────────────────────────────────────────── */
.composer-area {
  padding: var(--space-3) var(--space-4) var(--space-4);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border-subtle);
  flex-shrink: 0;
}

.composer-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.composer-box {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-3) var(--space-3);
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
  box-shadow: var(--shadow-sm);
}
.composer-box:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 79, 230, 0.12), var(--shadow-md);
}

.composer-textarea {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  max-height: 200px;
  min-height: 24px;
  overflow-y: auto;
  scrollbar-width: thin;
}

.composer-textarea::placeholder { color: var(--color-text-subtle); }

.composer-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.composer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-2);
  padding: 0 var(--space-1);
}

.composer-hint {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

/* Stop generation button (visible while streaming) */
.stop-btn {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  margin: 0 auto var(--space-2);
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  cursor: pointer;
  font-weight: var(--font-medium);
  transition: all var(--duration-fast);
}
.stop-btn:hover { background: var(--color-error); color: white; }
.stop-btn.visible { display: flex; }