.chat-area {
  display: flex; flex-direction: column;
  background: var(--surface);
  height: 100vh; overflow: hidden;
}

/* ── Top Bar ──────────────────────────────────── */
.chat-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px; border-bottom: 1px solid var(--border);
  background: rgba(17,24,39,0.7); backdrop-filter: blur(12px);
  flex-shrink: 0; gap: 12px;
}
.chat-title-block { display: flex; flex-direction: column; gap: 5px; overflow: hidden; }
.chat-session-name {
  font-size: 15px; font-weight: 700; color: var(--text);
  letter-spacing: -0.3px;
}
.chat-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.chat-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.toggle-label {
  display: flex; align-items: center; gap: 5px;
  font-size: 12px; color: var(--text-muted); cursor: pointer;
  user-select: none;
}
.toggle-label input[type="checkbox"] { accent-color: var(--primary); width: 13px; height: 13px; }

/* ── Error banner ────────────────────────────── */
.error-banner {
  background: var(--error-bg); color: var(--error);
  padding: 8px 20px; font-size: 13px;
  border-bottom: 1px solid rgba(239,68,68,0.2);
  flex-shrink: 0;
}

/* ── Messages ────────────────────────────────── */
.chat-messages {
  flex: 1; overflow-y: auto;
  padding: 20px;
  display: flex; flex-direction: column; gap: 6px;
}

/* ── Empty state ─────────────────────────────── */
.empty-state {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; padding: 48px 32px; gap: 14px;
  margin: auto;
}
.empty-icon {
  width: 88px; height: 88px; border-radius: 50%;
  background: var(--primary-glow);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 8px;
}
.empty-title { font-size: 20px; font-weight: 700; color: var(--text); letter-spacing: -0.4px; }
.empty-sub { font-size: 14px; color: var(--text-muted); max-width: 420px; line-height: 1.6; }
.empty-upload { padding: 12px 28px; font-size: 14px; }
.empty-hint { font-size: 11px; color: var(--text-dim); }

/* ── Message groups ──────────────────────────── */
.message-group {
  display: flex; flex-direction: column; gap: 6px;
  cursor: pointer; padding: 4px;
  border-radius: var(--radius);
  transition: background var(--transition);
}
.message-group:hover { background: rgba(255,255,255,0.02); }

/* User */
.user-row { display: flex; flex-direction: column; align-items: flex-end; gap: 3px; }
.user-bubble {
  background: linear-gradient(135deg, var(--primary), var(--primary-dim));
  color: #fff; padding: 10px 14px;
  border-radius: 14px 14px 2px 14px;
  font-size: 14px; line-height: 1.55;
  max-width: 74%; box-shadow: 0 4px 16px rgba(99,102,241,0.2);
}
.rewrite-hint {
  font-size: 10px; color: var(--text-dim);
  font-style: italic; margin-right: 4px;
  max-width: 74%; text-align: right;
}

/* AI */
.ai-row { display: flex; align-items: flex-start; gap: 10px; }
.ai-avatar {
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--primary-glow);
  border: 1px solid rgba(99,102,241,0.25);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; color: var(--violet);
}
.ai-card {
  background: var(--surface-mid);
  border: 1px solid var(--border);
  border-radius: 2px 14px 14px 14px;
  padding: 12px 14px;
  flex: 1; min-width: 0;
  transition: border-color var(--transition);
}
.ai-card:hover { border-color: rgba(99,102,241,0.22); }

.ai-loading {
  display: flex; align-items: center; gap: 8px;
  color: var(--text-muted); font-size: 13px;
}

.ai-header {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 10px; flex-wrap: wrap;
}
.ai-ts { font-size: 10px; color: var(--text-dim); margin-left: auto; }
.pin-btn {
  background: none; border: none; color: var(--text-dim);
  cursor: pointer; padding: 3px 5px;
  border-radius: 4px; display: flex;
}
.pin-btn:hover { color: var(--primary); background: var(--primary-glow); }

.ai-answer {
  font-size: 14px; line-height: 1.7; color: var(--text);
  display: flex; flex-direction: column; gap: 6px;
}
.ai-answer p { margin: 0; }

.inline-cite {
  display: inline-block;
  background: var(--primary-glow);
  color: var(--violet);
  font-size: 11px; font-weight: 600;
  padding: 0px 5px; border-radius: 4px;
  border: 1px solid rgba(99,102,241,0.2);
  margin: 0 1px;
}

/* Confidence */
.confidence-row, .coverage-bar-row {
  display: flex; align-items: center; gap: 8px; flex: 1;
}
.conf-label { font-size: 10px; color: var(--text-dim); white-space: nowrap; }
.conf-bar { flex: 1; }
.conf-pct { font-size: 10px; color: var(--text-muted); width: 28px; text-align: right; }
.coverage-bar-row { margin-top: 8px; }

/* Citations */
.citation-list { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 10px; }
.citation-chip {
  background: var(--surface-high); color: var(--text-muted);
  font-size: 11px; padding: 3px 8px; border-radius: 4px;
  border: 1px solid var(--border); cursor: default;
}
.citation-chip:hover { background: var(--primary-glow); color: var(--violet); }

/* Evidence toggle */
.evidence-toggle {
  display: flex; align-items: center; gap: 5px;
  background: none; border: none; color: var(--text-dim);
  font-size: 12px; cursor: pointer; padding: 6px 0;
  margin-top: 4px; font-family: var(--font);
}
.evidence-toggle:hover { color: var(--primary); }

.evidence-preview {
  display: flex; flex-direction: column; gap: 6px;
  margin-top: 4px;
}
.ev-chip {
  background: var(--surface-low);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  display: grid; grid-template-columns: auto 1fr auto; gap: 8px; align-items: start;
}
.ev-id { color: var(--violet); font-size: 11px; font-weight: 700; flex-shrink: 0; }
.ev-preview { font-size: 12px; color: var(--text-muted); line-height: 1.5; }
.ev-page { color: var(--text-dim); font-size: 10px; align-self: center; white-space: nowrap; }

/* Typing indicator */
.typing-indicator {
  display: flex; align-items: center; gap: 10px; padding: 4px;
}
.typing-dots { display: flex; gap: 4px; align-items: center; padding: 10px 14px; }
.typing-dots span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-dim); animation: bounce 1.2s ease-in-out infinite;
}
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes bounce {
  0%, 80%, 100% { transform: scale(0.7); opacity: 0.4; }
  40% { transform: scale(1.1); opacity: 1; }
}

/* ── Input Bar ───────────────────────────────── */
.chat-input-bar {
  display: flex; align-items: flex-end; gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: rgba(17,24,39,0.8); backdrop-filter: blur(12px);
  flex-shrink: 0;
}
.input-icon-btn {
  background: var(--surface-high); border: 1px solid var(--border);
  color: var(--text-muted); border-radius: var(--radius-sm);
  padding: 9px 10px; cursor: pointer; display: flex;
  transition: all var(--transition); flex-shrink: 0;
}
.input-icon-btn:hover { color: var(--primary); border-color: var(--primary); }
.input-icon-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.chat-input {
  flex: 1;
  background: var(--surface-low);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font); font-size: 14px;
  padding: 10px 14px;
  outline: none; resize: none;
  max-height: 140px; overflow-y: auto;
  line-height: 1.5;
  transition: border-color var(--transition), box-shadow var(--transition);
  scrollbar-width: thin;
}
.chat-input::placeholder { color: var(--text-dim); }
.chat-input:focus {
  border-color: rgba(99,102,241,0.45);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.08);
}
.chat-input:disabled { opacity: 0.45; cursor: not-allowed; }

.send-btn {
  padding: 9px 14px; flex-shrink: 0;
  border-radius: var(--radius-sm);
}