.ai-drawer {
  --ai-drawer-z: 30;
}

.ai-drawer__open {
  z-index: 1;
}

.ai-drawer__panel {
  background-color: var(--color-bg);
  container-type: inline-size;
  display: flex;
  flex-direction: column;
  font-size: var(--font-medium-responsive);
  min-block-size: 0;

  @media print {
    display: none;
  }
}

/* Mobile: overlay drawer */
@media (max-width: 70ch) {
  .ai-drawer__panel {
    border-inline-start: 1px solid var(--color-subtle);
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.08);
    inline-size: min(560px, 92vw);
    inset-block: 0;
    inset-inline-end: 0;
    position: fixed;
    transform: translateX(100%);
    transition: transform 0.2s ease-out;
    z-index: var(--ai-drawer-z);
  }

  .ai-drawer--open .ai-drawer__panel {
    transform: translateX(0);
  }

  .ai-drawer__backdrop {
    background-color: rgba(0, 0, 0, 0.3);
    cursor: pointer;
    inset: 0;
    opacity: 0;
    pointer-events: none;
    position: fixed;
    transition: opacity 0.2s ease-out;
    z-index: calc(var(--ai-drawer-z) - 1);
  }

  .ai-drawer--open .ai-drawer__backdrop {
    opacity: 1;
    pointer-events: auto;
  }
}

/* Desktop: docked side panel that pushes content */
@media (min-width: 70ch) {
  .ai-drawer {
    align-self: start;
    border-inline-start: 1px solid var(--color-subtle);
    grid-area: ai-drawer;
    max-block-size: 100dvh;
    min-block-size: 100dvh;
    overflow: hidden;
    position: sticky;
    top: 0;
  }

  .ai-drawer__panel {
    block-size: 100%;
    inline-size: 100%;
  }

  .ai-drawer .ai-drawer__close {
    display: none;
  }

  body:not(:has(#ai-drawer-toggle:checked)) .ai-drawer {
    display: none;
  }

  .ai-drawer__backdrop {
    display: none;
  }
}

.ai-drawer__close {
  align-self: flex-end;
  margin-block: var(--block-space-half);
  margin-inline-end: var(--block-space-half);
}

.ai-drawer__frame,
.ai-drawer__content {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: var(--block-space-half);
  min-block-size: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-inline: var(--block-space);
}

.ai-drawer__header {
  align-items: center;
  background-color: var(--color-bg);
  display: flex;
  gap: var(--inline-space);
  padding-block: var(--block-space-half);
  position: sticky;
  top: 0;
  z-index: 2;
}

.ai-drawer__title-wrap {
  align-items: center;
  display: flex;
  flex: 1;
  gap: var(--inline-space-half);
  min-inline-size: 0;
}

.ai-drawer__title {
  flex: 0 1 auto;
  font-size: var(--font-medium-responsive);
  font-weight: 600;
  margin: 0;
  min-inline-size: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-drawer__title-edit {
  flex-shrink: 0;
  opacity: 0.6;

  &:hover,
  &:focus {
    opacity: 1;
  }
}

.ai-drawer__title-form {
  display: flex;
  flex: 1;
  gap: var(--inline-space-half);
  margin: 0;
  min-inline-size: 0;
}

.ai-drawer__title-form .input {
  flex: 1;
  min-inline-size: 0;
}

.ai-drawer__back,
.ai-drawer__new {
  flex-shrink: 0;
}

.ai-drawer__list,
.ai-drawer__sibling-list ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ai-drawer__sibling-list {
  border-block-end: 1px solid var(--color-subtle-light);
  font-size: var(--font-small-responsive);
  padding-block-end: var(--block-space-half);
}

.ai-drawer__sibling-list summary {
  color: var(--color-subtle-dark);
  cursor: pointer;
  padding-block: var(--block-space-half);
}

.ai-conversation {
  align-items: center;
  display: flex;
  gap: var(--inline-space-half);
  padding-inline-end: var(--inline-space-half);
}

.ai-conversation--active {
  font-weight: 600;
}

.ai-conversation__link {
  border-radius: 0.4em;
  color: inherit;
  flex: 1;
  min-inline-size: 0;
  overflow: hidden;
  padding-block: 0.4em;
  padding-inline: 0.5em;
  text-decoration: none;
  text-overflow: ellipsis;
  white-space: nowrap;

  &:hover {
    background-color: var(--color-subtle-light);
  }
}

.ai-conversation--active .ai-conversation__link {
  background-color: var(--color-subtle-light);
}

.ai-conversation__delete-form {
  margin: 0;
}

.ai-conversation__delete {
  opacity: 0;
}

.ai-conversation:hover .ai-conversation__delete,
.ai-conversation:focus-within .ai-conversation__delete {
  opacity: 1;
}

.ai-drawer__messages {
  display: flex;
  flex-direction: column;
  font-size: var(--font-small-responsive);
  gap: var(--block-space-half);
  padding-block: var(--block-space-half);
}

.ai-message {
  line-height: 1.5;
  word-wrap: break-word;
}

.ai-message--user {
  align-self: flex-end;
  background-color: var(--color-link);
  border-radius: 0.8em;
  color: var(--color-ink-reversed);
  max-inline-size: 88%;
  padding: 0.55em 0.85em;
}

.ai-message--assistant {
  align-self: stretch;
  padding-block: var(--block-space-half);
}

.ai-message--pending {
  font-style: italic;
  opacity: 0.7;
}

.ai-message__pending::after {
  animation: ai-pending 1.4s steps(4, end) infinite;
  content: "";
}

@keyframes ai-pending {
  0% { content: ""; }
  25% { content: "."; }
  50% { content: ".."; }
  75% { content: "..."; }
}

.ai-message__body {
  > :first-child { margin-block-start: 0; }
  > :last-child { margin-block-end: 0; }
}

.ai-message__retry {
  color: var(--color-subtle-dark);
  display: inline-block;
  margin-block-start: 0.4em;
}

.ai-drawer__composer {
  background-color: var(--color-bg);
  border-block-start: 1px solid var(--color-subtle-light);
  bottom: 0;
  display: flex;
  flex-direction: column;
  gap: var(--block-space-half);
  margin-block-start: auto;
  padding-block: var(--block-space-half);
  position: sticky;
  z-index: 1;
}

.ai-drawer__composer .input {
  min-block-size: 9em;
  resize: vertical;
}

.ai-drawer__composer .input:disabled {
  opacity: 0.6;
}

.ai-drawer__composer-actions {
  align-items: center;
  display: flex;
  justify-content: flex-end;
}

.ai-drawer__empty,
.ai-drawer__loading,
.ai-drawer__placeholder {
  color: var(--color-subtle-dark);
  font-size: var(--font-small-responsive);
  padding-block: var(--block-space);
  text-align: center;
}