/* Support widget — uses OSI design tokens */
#osi-support-btn {
  position: fixed;
  right: var(--osi-space-4);
  bottom: 1.25rem;
  z-index: 9999;
  display: inline-flex;
  align-items: center;
  gap: var(--osi-space-2);
  height: var(--osi-ctrl-h);
  padding: 0 var(--osi-ctrl-px);
  border: 1px solid var(--osi-border-hover);
  border-radius: var(--osi-radius);
  background: var(--osi-accent);
  color: var(--osi-accent-ink);
  font-family: var(--osi-font-body);
  font-size: var(--osi-ctrl-fs-sm);
  font-weight: var(--osi-ctrl-fw);
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow: var(--osi-shadow);
  transition: transform 0.15s ease, filter 0.15s ease;
}

#osi-support-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

#osi-support-btn:active {
  transform: translateY(0);
}

#osi-support-btn .osi-support-icon {
  display: inline-flex;
  width: 20px;
  height: 20px;
}

#osi-support-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: none;
  align-items: flex-end;
  justify-content: flex-end;
  padding: var(--osi-space-4);
  background: var(--osi-overlay);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

#osi-support-overlay.is-open {
  display: flex;
}

.osi-support-dialog {
  width: min(100%, 380px);
  max-height: min(78vh, 560px);
  display: flex;
  flex-direction: column;
  border-radius: var(--osi-radius-lg);
  border: 1px solid var(--osi-border);
  background: var(--osi-surface);
  color: var(--osi-text);
  box-shadow: var(--osi-shadow);
  overflow: hidden;
  font-family: var(--osi-font-body);
}

.osi-support-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--osi-space-3);
  padding: var(--osi-space-4) var(--osi-space-4) var(--osi-space-3);
  border-bottom: 1px solid var(--osi-border);
  background: linear-gradient(180deg, rgba(61, 255, 168, 0.08), transparent);
}

.osi-support-head h2 {
  margin: 0;
  font-family: var(--osi-font-display);
  font-size: var(--osi-fs-lg);
  font-weight: 700;
  letter-spacing: var(--osi-tracking-tight);
}

.osi-support-sub {
  margin: var(--osi-space-1) 0 0;
  font-size: var(--osi-fs-xs);
  color: var(--osi-text-muted);
  line-height: var(--osi-lh);
}

.osi-support-close {
  border: 0;
  background: var(--osi-surface-2);
  color: var(--osi-text);
  width: var(--osi-ctrl-h-sm);
  height: var(--osi-ctrl-h-sm);
  border-radius: var(--osi-radius);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

.osi-support-close:hover {
  background: rgba(61, 255, 168, 0.12);
}

.osi-support-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--osi-space-4);
  display: flex;
  flex-direction: column;
  gap: var(--osi-space-3);
  background: rgba(7, 16, 22, 0.35);
}

.osi-support-msg {
  max-width: 88%;
  padding: 0.65rem 0.8rem;
  border-radius: var(--osi-radius);
  font-size: var(--osi-fs-sm);
  line-height: 1.4;
}

.osi-support-msg p {
  margin: 0;
}

.osi-support-msg--bot {
  align-self: flex-start;
  background: var(--osi-surface-2);
  border: 1px solid var(--osi-border);
  color: var(--osi-text);
  border-bottom-left-radius: 0.25rem;
}

.osi-support-msg--agent {
  align-self: flex-start;
  background: rgba(61, 255, 168, 0.1);
  border: 1px solid rgba(61, 255, 168, 0.28);
  color: var(--osi-text);
  border-bottom-left-radius: 0.25rem;
}

.osi-support-msg-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--osi-accent-2);
  margin-bottom: 0.25rem;
}

.osi-support-msg--user {
  align-self: flex-end;
  background: rgba(61, 255, 168, 0.14);
  color: var(--osi-text);
  border: 1px solid rgba(61, 255, 168, 0.32);
  border-bottom-right-radius: 0.25rem;
  position: relative;
  padding-bottom: 1.15rem;
}

.osi-support-msg-meta {
  position: absolute;
  right: 0.55rem;
  bottom: 0.28rem;
  display: inline-flex;
  align-items: center;
  opacity: 0.85;
  line-height: 0;
}

.osi-tick {
  width: 14px;
  height: 11px;
  display: block;
  color: rgba(238, 246, 248, 0.75);
}

.osi-tick--double {
  width: 17px;
}

.osi-tick--read {
  color: var(--osi-accent);
}

.osi-support-msg--user[data-status="pending"] .osi-tick {
  width: 12px;
  height: 12px;
  opacity: 0.7;
  animation: osi-tick-pulse 1s ease-in-out infinite;
}

.osi-support-msg--error {
  outline: 1px solid rgba(255, 92, 92, 0.7);
}

@keyframes osi-tick-pulse {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.9; }
}

.osi-support-form {
  display: flex;
  flex-direction: column;
  gap: var(--osi-stack);
  padding: var(--osi-space-3) var(--osi-space-4) var(--osi-space-4);
  border-top: 1px solid var(--osi-border);
  background: var(--osi-surface);
}

.osi-support-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--osi-space-2);
}

.osi-support-fields input,
.osi-support-compose textarea {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--osi-border);
  border-radius: var(--osi-radius);
  background: rgba(7, 16, 22, 0.55);
  color: var(--osi-text);
  padding: 0 0.7rem;
  height: var(--osi-ctrl-h-sm);
  font: inherit;
  font-size: var(--osi-ctrl-fs-sm);
  outline: none;
}

.osi-support-compose textarea {
  height: auto;
  min-height: 44px;
  max-height: 7rem;
  padding: 0.55rem 0.7rem;
  resize: none;
}

.osi-support-fields input:focus,
.osi-support-compose textarea:focus {
  border-color: var(--osi-border-hover);
  box-shadow: var(--osi-focus);
}

.osi-support-compose {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--osi-space-2);
  align-items: end;
}

.osi-support-send {
  border: 0;
  border-radius: var(--osi-radius);
  background: var(--osi-accent);
  color: var(--osi-accent-ink);
  font-weight: var(--osi-ctrl-fw);
  font-size: var(--osi-ctrl-fs-sm);
  height: var(--osi-ctrl-h);
  min-width: 7rem;
  padding: 0 var(--osi-ctrl-px-sm);
  cursor: pointer;
  white-space: nowrap;
}

.osi-support-send:disabled {
  opacity: 0.6;
  cursor: wait;
}

.osi-support-send:hover:not(:disabled) {
  filter: brightness(1.05);
}

@media (max-width: 420px) {
  #osi-support-btn .osi-support-label {
    display: none;
  }

  #osi-support-btn {
    padding: 0;
    width: var(--osi-ctrl-h);
    justify-content: center;
  }

  #osi-support-overlay {
    padding: 0;
    align-items: stretch;
    justify-content: stretch;
  }

  .osi-support-dialog {
    width: 100%;
    max-height: 100%;
    height: 100%;
    border-radius: 0;
  }

  .osi-support-fields {
    grid-template-columns: 1fr;
  }
}