/* Chat header — session picker, status pill, links. */
header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  padding-top: calc(var(--space-3) + env(safe-area-inset-top, 0px));
  background: var(--bg-1);
  border-bottom: 1px solid var(--border-1);
  flex-shrink: 0;
  position: relative;
  z-index: 20;
}
header .links {
  font-size: var(--fs-xs);
  display: flex;
  gap: var(--space-3);
}
header .links a {
  color: var(--fg-2);
}
header .links a:hover {
  color: var(--fg-0);
}

/* Session picker: brand + current session title + caret. Click opens the
   session menu below the header. */
.session-picker {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  background: transparent;
  border: none;
  padding: 4px 6px;
  margin-left: -6px;
  border-radius: var(--radius-sm);
  color: var(--fg-0);
  font-size: var(--fs-md);
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  min-width: 0;
  max-width: 70%;
  transition: background var(--t-fast);
}
.session-picker:hover {
  background: var(--bg-2);
}
.session-picker[aria-expanded="true"] {
  background: var(--bg-2);
}
.session-picker .brand {
  color: var(--accent);
  font-weight: 600;
}
.session-picker .sep {
  color: var(--fg-3);
}
.session-picker .session-title {
  color: var(--fg-1);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  max-width: 100%;
}
.session-picker .caret {
  color: var(--fg-3);
  font-size: var(--fs-xs);
  align-self: center;
}

/* Dropdown anchored below the header. */
.session-menu {
  position: absolute;
  top: 100%;
  left: var(--space-3);
  right: var(--space-3);
  max-width: 480px;
  max-height: 60vh;
  overflow-y: auto;
  background: var(--bg-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  z-index: 30;
  padding: 6px 0;
}
.session-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  width: 100%;
  background: transparent;
  border: none;
  padding: 8px var(--space-4);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--t-fast);
}
.session-item:hover {
  background: var(--bg-2);
}
.session-item .session-title {
  color: var(--fg-0);
  font-size: var(--fs-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  width: 100%;
}
.session-item .session-meta {
  color: var(--fg-3);
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
}
.session-item.active .session-title {
  color: var(--accent);
  font-weight: 600;
}
.session-item.active::after {
  content: "active";
  position: absolute;
  right: var(--space-4);
  color: var(--accent);
  font-size: var(--fs-xs);
  margin-top: 2px;
}
.session-item.active {
  position: relative;
}
.session-item.new .session-title {
  color: var(--accent);
  font-weight: 600;
}
.session-divider {
  height: 1px;
  background: var(--border-1);
  margin: 6px 0;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
  background: var(--bg-2);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-pill);
  color: var(--fg-1);
  padding: 4px 10px;
  font-size: var(--fs-xs);
  cursor: default;
  transition:
    background var(--t-fast),
    color var(--t-fast);
}
.status-pill .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--fg-2);
}
.status-pill.alive {
  color: var(--fg-0);
}
.status-pill.alive .dot {
  background: var(--ok);
}
.status-pill.down {
  color: var(--fg-0);
  cursor: pointer;
}
.status-pill.down .dot {
  background: var(--warn);
}
.status-pill.down:hover {
  background: var(--bg-1);
}
.status-pill.down:active {
  filter: brightness(1.2);
}
.status-pill.warn {
  color: var(--fg-0);
}
.status-pill.warn .dot {
  background: var(--warn, #d97706);
  animation: pulse-warn 1.2s ease-in-out infinite;
}
@keyframes pulse-warn {
  0%,
  100% {
    opacity: 0.4;
  }
  50% {
    opacity: 1;
  }
}