.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: var(--topbar-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.back-link {
  color: var(--text-dim);
  text-decoration: none;
  font-weight: 600;
  font-size: 13.5px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  transition: all 0.2s ease;
}

.back-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.1);
}

.brandmark-small {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 17px;
  color: var(--text);
}

.brandmark-small .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #A855F7;
  box-shadow: 0 0 12px #A855F7, 0 0 20px #EC4899;
}

#branch-error {
  max-width: 800px;
  margin: 20px auto 0;
}

/* ---------- Chat Interface ---------- */
.chat-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  height: calc(100vh - 80px);
}

.messages {
  flex: 1;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
  box-shadow: var(--shadow-md);
}

.message-row {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  transition: background 0.2s ease;
}

.message-row:hover {
  background: var(--surface-hover);
}

.message-avatar-wrap { margin-top: 2px; }

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  background: var(--surface-muted);
}

.message-bubble {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.message-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  display: flex;
  gap: 8px;
  align-items: center;
}

.message-meta strong {
  color: #38BDF8;
  font-family: var(--font-display);
  font-size: 13px;
}

.message-time { color: var(--text-muted); }

.message-content {
  font-size: 14.5px;
  color: var(--text);
  line-height: 1.5;
  word-break: break-word;
}

.message-content.deleted {
  color: var(--text-muted);
  font-style: italic;
}

.tag-edited, .tag-deleted {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.message-actions {
  display: inline-flex;
  gap: 2px;
  margin-left: auto;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.message-row:hover .message-actions { opacity: 1; }

.message-form {
  display: flex;
  gap: 12px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow-md);
}

.message-form input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 8px 14px;
  font-size: 14.5px;
  color: var(--text);
  outline: none;
  font-family: var(--font-display);
}

.message-form input::placeholder {
  color: var(--text-muted);
}

.branch-wrap .card {
  padding: 28px;
}

.go-branches .section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.go-branches .section-head h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}