.support-chat {
  position: fixed;
  inset-inline-end: max(var(--space-5), env(safe-area-inset-right, 0px));
  inset-block-end: max(var(--space-5), env(safe-area-inset-bottom, 0px));
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-3);
}

.support-chat[hidden],
.support-chat [hidden] {
  display: none !important;
}

.support-chat__launcher {
  position: relative;
  width: 3.25rem;
  height: 3.25rem;
  border: 0;
  border-radius: 999px;
  background: var(--brand-primary);
  color: #fff;
  box-shadow: var(--shadow-lg);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.support-chat__launcher:hover { filter: brightness(0.96); }
.support-chat__launcher:focus-visible { outline: 2px solid var(--brand-primary); outline-offset: 3px; }

.support-chat__badge {
  position: absolute;
  inset-block-start: -2px;
  inset-inline-end: -2px;
  min-inline-size: 1.15rem;
  padding: 0 0.3rem;
  border-radius: var(--radius-pill);
  background: var(--danger);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1.15rem;
  text-align: center;
}

.support-chat__panel {
  display: none;
  width: min(22.5rem, calc(100vw - 2rem));
  max-height: min(36rem, calc(100dvh - 7rem));
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  flex-direction: column;
  overflow: hidden;
}

.support-chat.is-open .support-chat__panel {
  display: flex;
}

.support-chat__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--brand-secondary);
  color: #fff;
}

.support-chat__presence {
  flex: none;
  width: 0.55rem;
  height: 0.55rem;
  margin-block-start: 0.45rem;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 4px rgb(52 211 153 / 0.18);
}

.support-chat__title {
  margin: 0;
  font-size: var(--text-base);
  font-weight: 700;
}

.support-chat__lede {
  margin: 0.25rem 0 0;
  font-size: var(--text-xs);
  opacity: 0.85;
}

.support-chat__close {
  flex: none;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: #fff;
  cursor: pointer;
}

.support-chat__close:hover { background: rgb(255 255 255 / 0.12); }

.support-chat__thread,
.host-chat__thread {
  flex: 1;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  min-height: 12rem;
}

.support-chat__intro,
.support-chat__system,
.host-chat__bubble--system {
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-align: center;
}

.support-chat__bubble,
.host-chat__bubble {
  max-width: 85%;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--canvas);
}

.support-chat__bubble p,
.host-chat__bubble p {
  margin: 0;
  white-space: pre-wrap;
  font-size: var(--text-sm);
}

.support-chat__bubble--visitor {
  align-self: flex-end;
  background: var(--brand-primary);
  color: #fff;
}

.support-chat__bubble--agent {
  align-self: flex-start;
}

.host-chat__bubble--visitor { align-self: flex-start; }
.host-chat__bubble--agent {
  align-self: flex-end;
  background: var(--brand-primary);
  color: #fff;
}

.support-chat__meta,
.host-chat__meta {
  font-size: var(--text-2xs);
  opacity: 0.75;
  margin-block-end: 0.25rem;
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
}

.support-chat__form,
.host-chat__composer {
  border-block-start: 1px solid var(--border);
  padding: var(--space-3);
  display: grid;
  gap: var(--space-2);
}

.support-chat__identity {
  display: grid;
  gap: var(--space-2);
}

@media (min-width: 420px) {
  .support-chat__identity {
    grid-template-columns: 1fr 1fr;
  }
}

.support-chat__compose {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: end;
}

.support-chat__input {
  resize: none;
  min-height: 2.75rem;
  max-height: 7.5rem;
  overflow-y: auto;
}

.support-chat__send {
  min-inline-size: 5.5rem;
}

.support-chat__send:disabled {
  opacity: 0.7;
  cursor: wait;
}

.support-chat__error { color: var(--danger); font-size: var(--text-xs); margin: 0; }

.host-chat {
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 28rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.host-chat__composer { align-items: end; }

.impersonation-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex: 1;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-md);
  background: var(--warning-soft);
  color: var(--text-strong);
  font-size: var(--text-sm);
}

.impersonation-banner form { margin: 0; }

@media (max-width: 640px) {
  .support-chat {
    inset-inline-end: max(var(--space-3), env(safe-area-inset-right, 0px));
    inset-block-end: max(var(--space-3), env(safe-area-inset-bottom, 0px));
  }

  .support-chat.is-open .support-chat__panel {
    width: min(calc(100vw - 1rem), 22.5rem);
    max-height: min(34rem, calc(100dvh - 5.5rem));
  }

  .support-chat__send { min-inline-size: 4.5rem; }
}