.message-area {
  display: contents;

  &:has(.message) {
    .message-area--empty {
      display: none;
    }
  }

  &:not(:has(.message)) {
    --opacity: 0.2;

    block-size: 100vh;
    display: grid;
    place-content: center stretch;
    place-items: center center;

    > * {
      grid-area: 1/1;
    }

    .message-area--empty > figure img {
      inline-size: 30dvw;
    }
  }
}

.message-area__return-to-latest {
  animation: pulsing-outline 2s infinite both;
  outline: 0 solid var(--color-selected-dark);
  inset-block-end: var(--footer-height);
  inset-inline-start: calc(50% - calc(var(--btn-size) / 2));
  position: absolute;
}

#system_welcome {
  --avatar-size: 5ch;

  display: block;
  margin-block-start: calc(var(--avatar-size) * 2);
  position: relative;
  z-index: 1;

  .avatar {
    margin-block-start: calc(var(--avatar-size) * -0.5);
  }

  .message__body {
    display: block;
    max-inline-size: unset;
  }

  .message__body-content {
    overflow: unset;
  }

  .system-welcome--translation {
    inset-block-start: var(--block-space);
    inset-inline-start: var(--block-space);
    position: absolute;
  }

  .invite-label,
  .btn--regenerate {
    display: none;
  }
}

.messages {
  --message-column-gap: 0.66ch;
  --message-row-gap: 0.05em;
  --message-space: 1em;

  display: grid;
  flex: 1;
  grid-auto-rows: min-content;
  overflow-y: auto;
  overscroll-behavior: contain;
  position: relative;
  row-gap: var(--message-space);

  /* Gradient overlay at top to fade messages as they scroll under stuck avatars */
  &::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(to bottom,
      var(--color-bg) 0%,
      transparent 40px
    );
    pointer-events: none;
    z-index: 99;

    @media (max-width: 100ch) {
      height: 30px;
      background: linear-gradient(to bottom,
        var(--color-bg) 0%,
        transparent 30px
      );
    }
  }

  /* Custom scrollbar styling */
  &::-webkit-scrollbar {
    width: 16px;
  }

  &::-webkit-scrollbar-track {
    background: transparent;
  }

  &::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--color-border-darker) 30%, var(--color-bg) 70%);
    border-radius: 8px;
    border: 4px solid var(--color-bg);
  }

  &::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--color-border-darker) 50%, var(--color-bg) 50%);
  }

  /* Firefox scrollbar */
  scrollbar-width: auto;
  scrollbar-color: color-mix(in srgb, var(--color-border-darker) 30%, var(--color-bg) 70%) transparent;

  /* Smaller scrollbar on mobile */
  @media (max-width: 768px) {
    &::-webkit-scrollbar {
      width: 8px;
    }

    &::-webkit-scrollbar-thumb {
      border-radius: 4px;
      border: var(--border-width-thick) solid var(--color-bg);
    }

    scrollbar-width: thin;
  }

  @media (max-width: 100ch) {
    --message-row-gap: 0.03em;
    --message-space: 0.75em;
    padding-block-start: var(--navbar-height);
  }
}

.message {
  --content-padding-block: 0.5rem;
  --content-padding-inline: calc(var(--inline-space) * 1.25);

  column-gap: var(--message-column-gap);
  display: grid;
  grid-auto-columns: var(--inline-space-double) 1fr min-content;
  grid-auto-rows: min-content;
  grid-template-areas:
    "sep sep sep"
    "avatar body body";
  padding-inline: calc(var(--inline-space) + 1vw);
  position: relative;
  row-gap: var(--message-row-gap);
  visibility: hidden;
  z-index: 0;

  @media (max-width: 100ch) {
    --content-padding-block: 0.4rem;
    --content-padding-inline: var(--inline-space);
  }

  .message__boost-inline {
    display: none;
  }

  &:last-of-type {
    &:has(.boost__reactions) {
      .message__body {
        padding-block-end: 3.2rem;
      }
    }
  }

  &.message--formatted {
    visibility: visible;
  }

  &:has([open]) {
    z-index: 1;

    .message__options-btn {
      opacity: 1;
    }

    .message__actions-menu {
      display: block;
    }
  }

  &:has(.boost-item) {
    .message__boost-inline {
      display: inline-flex;
    }
  }

  + .message--threaded {
    margin-block-start: calc((var(--message-space) + (var(--message-row-gap) * 2) - 2px) * -1);
  }

  /* A-08 (docs/reviewer-notes/2026-07-17-timeline-artifacts-adversarial-
     review.md): previously opacity: 0.5 plus a CSS-generated "🚫" symbol --
     the exact "dim row, CSS symbol, no readable reason" pattern the review
     flagged. A failed pending message now carries a real, readable reason
     and interactive Retry/Remove controls (see ClientMessage#failed /
     messages/_attachment_processing_status.html.erb), so dimming the whole
     row to 50% opacity would hurt the contrast of exactly the content and
     controls a user now needs to read and use. The outline + wiggle remain
     as a purely visual "something went wrong here" cue (prefers-reduced-
     motion: reduce already neutralizes the animation globally -- see
     _reset.css). */
  &.message--failed {
    .message__body-content {
      animation: wiggle 0.4s both;
      outline: 1px dashed var(--color-negative);
    }
  }
}

.message__day-separator {
  align-items: center;
  display: none;
  font-size: 0.8rem;
  font-weight: 600;
  grid-area: sep;
  grid-template-columns: 1fr auto 1fr;
  inline-size: 100%;
  margin-block: var(--message-space);
  text-align: center;
  text-transform: uppercase;
  visibility: hidden;

  time,
  span {
    padding: 0.66em 2.33ch;
    background-color: var(--color-message-bg);
    border-radius: 3em;
  }

  &::after,
  &::before {
    border-top: var(--border-width-thick) solid var(--color-message-bg);
    content: "";
  }

  .message--first-of-day & {
    display: grid;
    visibility: visible;
  }
}

.message__avatar {
  --avatar-border-size: var(--border-width);
  --avatar-size: 3.5ch;

  grid-area: avatar;
  z-index: 101; /* Above thread lines (z-index: 10), message content (z-index: 11), and gradient (z-index: 99) */
  display: none; /* Hide by default to prevent flash */
  box-shadow: 0 0 0 var(--hover-size) var(--color-bg);
}

/* Only show avatar when explicitly not hidden AND message is formatted (but not system messages) */
.message--formatted:not(.message--system) .message__avatar:not([hidden]) {
  display: flex;
}

/* No box-shadow halo on first message of thread cluster - let thread line show through */
.message:has(+ .message--threaded) .message__avatar {
  --hover-size: 0;
}

/* Sticky positioning for first message avatar in thread cluster (others on left) */
.message:not(.message--threaded):has(+ .message--threaded) {
  z-index: 102; /* Elevate entire message so sticky avatar can float above subsequent messages */
}

.message:not(.message--threaded):has(+ .message--threaded) .message__avatar {
  position: sticky;
  top: var(--avatar-sticky-top-left, 4.5em);
  z-index: 101; /* Above thread lines (z-index: 10), message content (z-index: 11), and gradient (z-index: 99) */
  box-shadow: none !important; /* Remove all box-shadows from floating avatars */
}

.message:not(.message--threaded):has(+ .message--threaded) .message__avatar .avatar {
  box-shadow: none !important; /* Remove speaking indicator box-shadow */
}

/* Sticky positioning for first message avatar in thread cluster (me on right) */
.message--me:not(.message--threaded):has(+ .message--threaded) .message__avatar {
  top: var(--avatar-sticky-top-right, 4.5em);
}

/* Disable sticky when thread cluster has scrolled out of view */
.message--thread-scrolled-out .message__avatar {
  position: static;
}

.message__meta {
  align-items: center;
  column-gap: calc(var(--message-column-gap) / 2);
  display: flex;
  justify-content: start;
  line-height: 1.5;
  min-inline-size: 0;
  margin: 0;
  padding-inline-end: calc(var(--btn-size) / 2);

  .message__room {
    display: none;
    visibility: hidden;
  }

  .message__heading {
    align-items: center;
    column-gap: calc(var(--message-column-gap) / 2);
    display: inline-flex;
    margin: 0;
    min-inline-size: 0;
  }

  .message__actions {
    @media (max-width: 100ch) {
      .message__options-btn {
        --btn-padding: 0 0.5em;

        aspect-ratio: unset;
        block-size: auto;
        border-radius: var(--radius-sm);
      }
    }

    @media (min-width: 100ch) {
      inset-block-start: 50%;
      inset-inline-start: calc(100% + var(--message-column-gap) / 2);
      position: absolute;
      transform: translate(0, -50%);
    }
  }
}

.message__author {
  font-size: 0.8rem;
  font-weight: 400;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message__permalink {
  color: var(--color-text);
  font-size: 0.8rem;
  font-weight: 400;
  opacity: 0.5;
  text-decoration: none;
  white-space: nowrap;
}

.message__timestamp--zone,
.message__timestamp--label {
  font-size: 0.75em;
  opacity: 0.7;
}

.message__timestamp--viewer {
  font-weight: 500;
}

.message__edited {
  color: var(--color-text);
  font-size: 0.7rem;
  font-style: italic;
  opacity: 0.4;
  white-space: nowrap;
}

.message__body {
  column-gap: var(--inline-space-half);
  display: flex;
  grid-area: body;
  max-inline-size: min(80ch, 85%);
  position: relative;

  .message--me & {
    flex-direction: row-reverse;
  }

  @media (max-width: 100ch) {
    max-inline-size: 100%;
  }
}

.message__body-content {
  background-color: var(--message-background, var(--color-message-bg));
  border-radius: 0.66em;
  color: var(--message-color, var(--color-text));
  font-weight: 400;
  inline-size: fit-content;
  margin-block-end: var(--message-row-gap);
  max-inline-size: 100%;
  padding: var(--content-padding-block) var(--content-padding-inline);
  position: relative;
  z-index: 11; /* Above thread lines (z-index: 10) */
  word-break: break-word;

  &:has(.message__attachment) {
    margin-block-end: 0.33em;
    padding: 0;

    &:has(.boost) {
      padding-block-end: var(--block-space-half);

      .boosts {
        padding-inline: var(--inline-space);
      }
    }

    .message__meta {
      padding: var(--content-padding-block) var(--content-padding-inline);
    }
  }

  &.message__body-content--editing:has(.message__attachment) {
    max-inline-size: calc(100% - var(--btn-size));
  }

  &:has(.message__pending-upload) {
    padding: 0;
  }
}

.message__attachment {
  block-size: auto;
  border: var(--border-width) solid var(--color-border);
  border-radius: 0.66em;

  .message__body-content:has(.boost) & {
    border-end-start-radius: 0;
    border-end-end-radius: 0;
  }

  .message:not(.message--threaded) & {
    border-start-end-radius: 0;
    border-start-start-radius: 0;
  }
}

img.message__attachment {
  cursor: zoom-in;
}

.message__actions {
  align-content: center;
  display: flex;
  flex-wrap: wrap;
  justify-content: start;
  z-index: 3;
}

.message__action-btn {
  --btn-background: transparent;
  --btn-border-color: transparent;
  --outline-offset: 0;
  --width: 33%;

  flex-basis: var(--width);
  font-size: 0.8rem;

  @media (hover: hover) and (pointer: fine) {
    &:where(:not(:active):hover) {
      --btn-background: var(--color-border-dark);
      --hover-size: 0;

      opacity: 1;
    }
  }

  &:where(:not(:active)):focus-visible {
    opacity: 1;
  }

  .message__actions-grid & {
    padding: 0.5em;

    &:where(:has(> :last-child:nth-child(1))) & {
      --width: 100%;
    }

    &:where(:has(> :last-child:nth-child(even))) & {
      --width: 50%;
    }
  }
}

.message__edit-btn {
  display: none;

  .admin &,
  .message--me & {
    display: inline-flex;
  }
}

.message__options-btn {
  @media (hover: hover) and (pointer: fine) {
    opacity: 0;
    transition: opacity 150ms ease-in-out;
    transition-delay: 150ms;

    .message:hover & {
      opacity: 1;
    }
  }

  @media (hover: none) and (pointer: coarse) {
    opacity: 0.5;

    & [open] {
      opacity: 1;
    }
  }
}

.message__actions-menu {
  --arrow-size: 1.5em;
  --boost-border-color: var(--color-selected-dark);
  --border-color: var(--color-border-darker);
  --border-size: 1px;

  background-color: var(--color-bg);
  border-radius: calc(var(--arrow-size) / 2);
  display: none;
  inset: var(--btn-size) auto auto 50%;
  padding: var(--inline-space-half);
  position: absolute;
  transform: translateX(-50%);
  transform-origin: top left;

  &::before {
    aspect-ratio: 2;
    background: var(--border-color);
    clip-path: polygon(50% 0, 100% 100%, 0 100%);
    inline-size: var(--arrow-size);
    content: "";
    display: block;
    inset-block-start: calc(var(--arrow-size) / -2);
    inset-inline-start: 50%;
    position: absolute;
    transform: translateX(-50%);
  }

  &::after {
    aspect-ratio: 2;
    background: var(--color-bg);
    clip-path: polygon(50% 0, 100% 100%, 0 100%);
    inline-size: var(--arrow-size);
    content: "";
    display: block;
    inset-block-start: calc((var(--arrow-size) / -2) + var(--border-size) * 1.5);
    inset-inline-start: 50%;
    position: absolute;
    transform: translateX(-50%);
  }

  @media (max-width: 100ch) {
    inset-block-start: calc(var(--btn-size) / 1.5);
  }

  .popup-orientation-top & {
    inset-block-end: var(--btn-size);
    inset-block-start: auto;
    transform-origin: bottom left;

    &::before {
      clip-path: polygon(50% 100%, 100% 0, 0 0);
      inset-block-end: auto;
      inset-block-start: 100%;
    }

    &::after {
      clip-path: polygon(50% 100%, 100% 0, 0 0);
      inset-block-end: auto;
      inset-block-start: calc(100% - var(--border-size) * 1.5);
    }

    @media (max-width: 100ch) {
      inset-block-end: calc(var(--btn-size) / 1.5);
    }
  }
}

/* Me */
.message--me {
  grid-auto-columns: min-content 1fr var(--inline-space-double);
  grid-template-areas:
    "sep sep sep"
    "body body avatar";

  :is(.message__body, .message__meta, .message__heading) {
    justify-self: end;
  }

  :is(.message__meta, .message__heading) {
    flex-direction: row-reverse;
    justify-content: end;
  }

  .message__meta {
    padding-inline: calc(var(--btn-size) / 2) 0;
  }

  .message__avatar {
    margin-inline: calc(var(--content-padding-inline) * -1) 0;
  }

  .message__actions {
    justify-content: end;

    @media (min-width: 100ch) {
      inset-inline-end: calc(100% + var(--message-column-gap) / 2);
      inset-inline-start: auto;
    }
  }
}

.message--mentioned {
  .message__body-content {
    --message-background: oklch(var(--lch-red) / 0.1);

    animation: wiggle 0.4s both;

    @media (prefers-color-scheme: dark) {
      --message-background: oklch(var(--lch-red) / 0.2);
    }
  }
}

/* First message in cluster - start thread line from avatar center */
.message:not(.message--threaded):has(+ .message--threaded) {
  position: relative;

  &::after {
    content: "";
    position: absolute;
    /* Horizontal position from left edge of message:
       - Increase the number = move line RIGHT
       - Decrease the number = move line LEFT
       For others: line should come from center of avatar on left side */
    left: calc(var(--inline-space) + 1vw + 1.75ch);  /* padding + center of 3.5ch avatar */
    top: 2.5em;  /* Center of avatar circle (accounting for grid positioning) */
    bottom: calc(var(--message-space) * 0.85);  /* Stop where next message starts (before overlap) */
    width: 1px;
    background: color-mix(in srgb, var(--color-border-darker) 40%, var(--color-bg) 60%);
    z-index: 10;  /* Above message transparency effects */
  }
}

.message--threaded {
  margin-block-start: calc(var(--message-space) * -0.85);
  position: relative;

  /* All threaded messages draw their segment using opaque mixed color to prevent brightness variation */
  &::before {
    content: "";
    position: absolute;
    /* Horizontal position from left edge of message:
       - Increase = move RIGHT, Decrease = move LEFT */
    left: calc(var(--inline-space) + 1vw + 1.75ch);  /* padding + center of 3.5ch avatar */
    top: calc(var(--message-space) * -0.85);  /* Start from where negative margin pulled us up */
    bottom: 0;
    width: 1px;
    background: color-mix(in srgb, var(--color-border-darker) 40%, var(--color-bg) 60%);
    z-index: 10;  /* Above message transparency effects */
  }

  /* Last message in cluster - stop line slightly above middle to avoid overlap with curve */
  &:not(:has(+ .message--threaded))::before {
    bottom: calc(50% + 0.5em);
  }

  /* Curve at the bottom of the last message in cluster */
  &:not(:has(+ .message--threaded))::after {
    content: "";
    position: absolute;
    /* Horizontal position: Increase = move RIGHT, Decrease = move LEFT */
    left: calc(var(--inline-space) + 1vw + 1.75ch);  /* padding + center of 3.5ch avatar */
    bottom: 50%;
    width: 1.5em;
    height: 0.5em;
    border-bottom-left-radius: var(--radius-md);
    border-left: var(--border-width) solid color-mix(in srgb, var(--color-border-darker) 40%, var(--color-bg) 60%);
    border-bottom: var(--border-width) solid color-mix(in srgb, var(--color-border-darker) 40%, var(--color-bg) 60%);
    z-index: 10;  /* Above message transparency effects */
  }

  .message__author {
    display: none;
  }

  .message__heading {
    display: none;
  }

  .message__meta {
    min-block-size: 0;
    padding: 0;
  }

  .message__body-content {
    margin-block-start: 0.2em;
  }

  @media (max-width: 100ch) {
    margin-block-start: calc(var(--message-space) * -0.9);

    .message__body-content {
      margin-block-start: 0.15em;
    }
  }
}

/* Thread line on the right for my messages */
.message--me:not(.message--threaded):has(+ .message--threaded) {
  &::after {
    left: auto;
    /* Horizontal position from right edge of message:
       - Increase = move LEFT, Decrease = move RIGHT */
    right: calc(var(--inline-space) + 1vw + 1.75ch);  /* padding + center of 3.5ch avatar */
  }
}

.message--me.message--threaded {
  &::before {
    left: auto;
    /* Horizontal position: Increase = move LEFT, Decrease = move RIGHT */
    right: calc(var(--inline-space) + 1vw + 1.75ch);  /* padding + center of 3.5ch avatar */
  }

  &:not(:has(+ .message--threaded))::after {
    left: auto;
    /* Horizontal position: Increase = move LEFT, Decrease = move RIGHT */
    right: calc(var(--inline-space) + 1vw + 1.75ch);  /* padding + center of 3.5ch avatar */
    border-bottom-left-radius: 0;
    border-bottom-right-radius: var(--radius-md);
    border-left: none;
    border-right: var(--border-width) solid color-mix(in srgb, var(--color-border-darker) 40%, var(--color-bg) 60%);
  }

}

.message__edit-btns div:only-of-type {
  margin-inline: auto;
}

.message--emoji:not(:has(.composer--edit)) {
  .message__body-content {
    --message-background: transparent;

    border-radius: 0;
    margin-block-end: 0;
    padding: var(--content-padding-block) 0 var(--content-padding-block) var(--content-padding-inline);
    text-shadow: 0 0 3px var(--color-text-reversed);

    .trix-content {
      font-size: 2.4em;
      line-height: 1.4;
    }

    .message--me & {
      padding: var(--content-padding-block) var(--content-padding-inline) var(--content-padding-block) 0;
      text-align: right;
    }

    :is(.message--threaded) & {
      padding-block-start: 0;
    }
  }
}

/* System messages (call events, etc) */
.message--system {
  /* Override grid layout to center everything */
  grid-template-areas: "sep sep sep" "body body body";
  grid-template-columns: 1fr;

  .message__avatar {
    display: none;
  }

  .message__heading {
    display: none;
  }

  .message__body {
    grid-area: body;
    justify-self: center;
    max-inline-size: 100%;
    text-align: center;
  }

  .message__body-content {
    background-color: var(--color-bg);
    border-radius: 0;
    color: var(--color-text-muted);
    margin-block-end: 0;
    padding: var(--content-padding-block) 0;
  }

  .message__meta {
    justify-content: center;
  }

  .trix-content {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    font-style: italic;
    opacity: 0.6;
  }
}

/* Wall messages (admin announcements) */
.message--wall {
  /* Override grid layout to center everything */
  grid-template-areas: "sep sep sep" "body body body";
  grid-template-columns: 1fr;

  .message__avatar {
    display: none;
  }

  .message__body {
    grid-area: body;
    justify-self: center;
    max-inline-size: 100%;
    text-align: center;
  }

  .message__body-content {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 152, 0, 0.1));
    border: var(--border-width-thick) solid rgba(255, 152, 0, 0.3);
    border-radius: var(--border-radius);
    margin-block: var(--content-padding-block);
    padding: calc(var(--content-padding-block) * 2) calc(var(--content-padding-inline) * 2);
  }

  .message__heading {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-block-end: 0.75rem;
    font-weight: 600;
    color: var(--color-text);
  }

  .message__author {
    font-size: 1rem;
  }

  .message__timestamp,
  .message__edited,
  .message__room,
  .message__actions {
    display: none;
  }

  .message__meta {
    justify-content: center;
  }

  .trix-content {
    font-size: 1.125rem;
    font-weight: 500;
    line-height: 1.5;
    color: var(--color-text);
  }
}

/* Transcript messages */
.message--transcript {
  .trix-content {
    font-size: var(--font-size-s);
    font-family: var(--font-family-mono, monospace);
  }
}

/* Quoted transcript messages in replies */
.trix-content blockquote.blockquote--transcript,
.trix-content blockquote:has(.reply-quote-transcript-marker) {
  font-family: var(--font-family-mono, monospace) !important;
  font-size: var(--font-size-s) !important;
  position: relative;
  padding-inline-end: 2.5em !important;
}

.trix-content blockquote.blockquote--transcript::after,
.trix-content blockquote:has(.reply-quote-transcript-marker)::after {
  content: '';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  bottom: 0.35em;
  right: 0.35em;
  width: 18px;
  height: 18px;
  background-image: url("/assets/microphone-db684439.svg");
  background-size: 100%;
  background-position: center;
  background-repeat: no-repeat;
  filter: brightness(0) invert(1);
  opacity: 0.8;
}

.message__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  bottom: 0.15em;
  right: -0.65em;
  opacity: 1;
  background-color: rgba(0, 0, 0, 0.75);
  border-radius: 1em;
  padding: 0.2em 0.35em;
  box-shadow: var(--shadow-sm);

  &--transcript {
    opacity: 0.85;
  }

  img {
    display: block;
    width: 11px;
    height: 11px;
    filter: brightness(0) invert(1);
  }
}

.message.search-highlight {
  .message__body-content {
    border: var(--border-width-thick) solid var(--color-text);
    animation: border-fade-out 0.5s 1s forwards;
  }
}

/* Pending uploads */
.message__pending-upload {
  border-radius: 0.66em;
  overflow: hidden;
  padding: var(--content-padding-block) var(--content-padding-inline);
  position: relative;

  &::before {
    background-color: var(--color-border-dark);
    block-size: 100%;
    content: "";
    inline-size: 100%;
    inset-inline-start: var(--percentage);
    position: absolute;
    transform: translateX(-100%);
    z-index: 1;
  }

  > div {
    z-index: 2;
  }

  span {
    inline-size: 3rem;
    display: inline-block;
  }

  .composer__file-thumbnail {
    aspect-ratio: 1;
    background-size: contain;
    inline-size: 1.4em;
  }
}