/* -- Bubble component ---------------------------------------------- */
/* A chat message bubble: the surface only - avatars, names, timestamps and
   message actions belong to a message row around it. CSS only. */

@layer components {
  .bubble {
    --_bg: var(--primary);
    --_fg: var(--primary-foreground);
    --_bd: transparent;
    --_r: 1.125rem;
    --_rs: 0.3125rem;
    --_px: 0.875rem;
    --_py: 0.5rem;
    --_fs: 0.875rem;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    width: fit-content;
    max-width: 80%;
    min-width: 0;

    /* -- Alignment: start = the other side (received), end = you (sent) */
    &[data-align="end"],
    .bubble-group[data-align="end"] > & {
      margin-inline-start: auto;
      align-items: flex-end;
    }

    /* -- Variants -------------------------------------------------- */
    &[data-variant="secondary"] { --_bg: var(--secondary); --_fg: var(--secondary-foreground); }
    &[data-variant="muted"] { --_bg: var(--muted); --_fg: var(--muted-foreground); }
    &[data-variant="tinted"] { --_bg: color-mix(in oklch, var(--primary) 12%, var(--background)); --_fg: var(--foreground); }
    &[data-variant="outline"] { --_bg: var(--background); --_fg: var(--foreground); --_bd: var(--border); }
    &[data-variant="destructive"] { --_bg: color-mix(in oklch, var(--destructive) 12%, var(--background)); --_fg: var(--destructive); --_bd: color-mix(in oklch, var(--destructive) 30%, transparent); }
    &[data-variant="ghost"] {
      --_bg: transparent;
      --_fg: var(--foreground);
      --_px: 0;
      max-width: none;
      width: 100%;
    }

    /* -- Sizes ------------------------------------------------------ */
    &[data-size="sm"] { --_r: 0.875rem; --_px: 0.625rem; --_py: 0.3125rem; --_fs: 0.8125rem; }
    &[data-size="lg"] { --_r: 1.375rem; --_px: 1.125rem; --_py: 0.75rem; --_fs: 1rem; }
  }

  .bubble-content {
    box-sizing: border-box;
    max-width: 100%;
    padding: var(--_py) var(--_px);
    border: 1px solid var(--_bd);
    border-radius: var(--_r);
    background: var(--_bg);
    color: var(--_fg);
    font: inherit;
    font-size: var(--_fs);
    line-height: 1.45;
    text-align: start;
    text-wrap: pretty;
    overflow-wrap: anywhere;

    & > :first-child { margin-block-start: 0; }
    & > :last-child { margin-block-end: 0; }
    & p { margin-block: 0 0.5em; }
    & a:not(.bubble-content) { color: inherit; text-decoration: underline; text-underline-offset: 2px; }
    & code { font-family: var(--font-mono); font-size: 0.9em; padding: 0.0625rem 0.3125rem; border-radius: 0.3125rem; background: color-mix(in oklch, currentColor 12%, transparent); }
    & img, & video { display: block; max-width: 100%; height: auto; border-radius: calc(var(--_r) - 0.375rem); }
    & :is(ul, ol) { margin-block: 0.25em 0.5em; padding-inline-start: 1.25em; }

    /* a whole bubble as a link or a button (quick replies, options) */
    &:is(a, button) {
      appearance: none;
      cursor: pointer;
      text-decoration: none;
      transition: background-color 150ms ease, border-color 150ms ease;
      &:hover { background: color-mix(in oklch, var(--_bg) 88%, var(--_fg)); }
      &:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }
      &:disabled, &[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }
    }
  }
  .bubble[data-variant="ghost"] > .bubble-content:is(a, button):hover { background: var(--accent); }

  /* -- Media bubble: an image / video edge to edge ------------------ */
  .bubble-content[data-media] {
    padding: 0;
    overflow: hidden;
    & img, & video { border-radius: 0; }
    & .bubble-caption { padding: var(--_py) var(--_px); }
  }

  /* -- Collapsible content: a preview, the rest in a <details> ------- */
  .bubble-more {
    display: flex;
    flex-direction: column-reverse;

    & > summary {
      list-style: none;
      width: fit-content;
      margin-block-start: 0.25rem;
      font-weight: 500;
      text-decoration: underline;
      text-underline-offset: 2px;
      cursor: pointer;
      &::-webkit-details-marker { display: none; }
      &:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; border-radius: 0.25rem; }
    }
    & .bubble-more-open { display: none; }
    &[open] .bubble-more-open { display: inline; }
    &[open] .bubble-more-closed { display: none; }
    &::details-content {
      interpolate-size: allow-keywords;
      block-size: 0;
      overflow: clip;
      transition: block-size 220ms ease, content-visibility 220ms allow-discrete;
    }
    &[open]::details-content { block-size: auto; }
  }

  /* -- Reactions: overlapped emoji anchored to the bubble's edge ------- */
  .bubble-reactions {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    align-self: flex-end;
    margin-block-start: -0.5rem;
    margin-inline: 0.625rem;
    padding: 0.125rem;
    border-radius: 9999px;
    background: var(--background);
    box-shadow: 0 0 0 1px var(--border), var(--shadow-xs);
    font-size: 0.75rem;
    line-height: 1;

    & > * {
      display: grid;
      place-items: center;
      min-width: 1.375rem;
      height: 1.375rem;
      border-radius: 9999px;
      background: var(--background);
    }
    & > * + * { margin-inline-start: -0.3125rem; box-shadow: -2px 0 0 var(--background); }
    & > .bubble-reactions-count {
      padding-inline: 0.25rem 0.375rem;
      font-weight: 500;
      font-variant-numeric: tabular-nums;
      color: var(--muted-foreground);
      box-shadow: none;
      margin-inline-start: 0;
    }
    &[data-align="start"] { align-self: flex-start; }
    &[data-side="top"] { order: -1; margin-block: 0 -0.5rem; }
  }
  [dir="rtl"] .bubble-reactions > * + * { box-shadow: 2px 0 0 var(--background); }

  /* -- Group: consecutive bubbles of one sender, the joined corners
     tightened (logical radii, so RTL mirrors) ---------------------- */
  .bubble-group {
    display: flex;
    flex-direction: column;
    gap: 0.1875rem;

    & > .bubble { max-width: 80%; }
    & > .bubble:has(> .bubble-reactions:not([data-side="top"])):not(:last-child) { margin-block-end: 0.375rem; }

    /* received (start): the start-side corners between neighbours */
    &:not([data-align="end"]) > .bubble:not([data-align="end"]) {
      &:not(:last-child) > .bubble-content { border-end-start-radius: var(--_rs); }
      &:not(:first-child) > .bubble-content { border-start-start-radius: var(--_rs); }
    }
    /* sent (end) */
    &[data-align="end"] > .bubble, & > .bubble[data-align="end"] {
      &:not(:last-child) > .bubble-content { border-end-end-radius: var(--_rs); }
      &:not(:first-child) > .bubble-content { border-start-end-radius: var(--_rs); }
    }
  }

  /* -- Tail: data-tail on a bubble (or a group - its last bubble) draws
     a small curved tail at the bottom outer corner ------------------ */
  :is(.bubble[data-tail], .bubble-group[data-tail] > .bubble:last-child):not([data-variant="ghost"], [data-variant="outline"], [data-variant="destructive"]) > .bubble-content {
    position: relative;
    border-end-start-radius: var(--_rs);

    &::before {
      /* thick against the bubble, tapering to a point at the outer bottom:
         an SVG path mask, mirrored for the end side and RTL */
      content: "";
      position: absolute;
      inset-block-end: -1px;
      inset-inline-start: -0.75rem;
      width: 0.875rem;
      height: 1.25rem;
      background: var(--_bg);
      -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 20' preserveAspectRatio='none'%3E%3Cpath d='M14 1C14 11 9 18 0 20H14Z'/%3E%3C/svg%3E") 0 0 / 100% 100% no-repeat;
      mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 20' preserveAspectRatio='none'%3E%3Cpath d='M14 1C14 11 9 18 0 20H14Z'/%3E%3C/svg%3E") 0 0 / 100% 100% no-repeat;
    }
  }
  :is(.bubble[data-tail][data-align="end"], .bubble-group[data-tail][data-align="end"] > .bubble:last-child, .bubble-group[data-tail] > .bubble[data-align="end"]:last-child):not([data-variant="ghost"], [data-variant="outline"], [data-variant="destructive"]) > .bubble-content {
    border-end-start-radius: var(--_r);
    border-end-end-radius: var(--_rs);

    &::before {
      inset-inline-start: auto;
      inset-inline-end: -0.75rem;
      -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 20' preserveAspectRatio='none'%3E%3Cpath d='M0 1C0 11 5 18 14 20H0Z'/%3E%3C/svg%3E") 0 0 / 100% 100% no-repeat;
      mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 20' preserveAspectRatio='none'%3E%3Cpath d='M0 1C0 11 5 18 14 20H0Z'/%3E%3C/svg%3E") 0 0 / 100% 100% no-repeat;
    }
  }
  [dir="rtl"] :is(.bubble[data-tail], .bubble-group[data-tail] > .bubble:last-child) > .bubble-content::before {
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 20' preserveAspectRatio='none'%3E%3Cpath d='M0 1C0 11 5 18 14 20H0Z'/%3E%3C/svg%3E") 0 0 / 100% 100% no-repeat;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 20' preserveAspectRatio='none'%3E%3Cpath d='M0 1C0 11 5 18 14 20H0Z'/%3E%3C/svg%3E") 0 0 / 100% 100% no-repeat;
  }
  [dir="rtl"] :is(.bubble[data-tail][data-align="end"], .bubble-group[data-tail][data-align="end"] > .bubble:last-child, .bubble-group[data-tail] > .bubble[data-align="end"]:last-child) > .bubble-content::before {
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 20' preserveAspectRatio='none'%3E%3Cpath d='M14 1C14 11 9 18 0 20H14Z'/%3E%3C/svg%3E") 0 0 / 100% 100% no-repeat;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 20' preserveAspectRatio='none'%3E%3Cpath d='M14 1C14 11 9 18 0 20H14Z'/%3E%3C/svg%3E") 0 0 / 100% 100% no-repeat;
  }

  /* -- Typing: three dots that bounce while the other side writes ---- */
  .bubble-typing {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    height: calc(var(--_fs) * 1.45);

    & > span {
      width: 0.4375rem;
      height: 0.4375rem;
      border-radius: 9999px;
      background: currentColor;
      opacity: 0.45;
      animation: bubble-typing 1.2s ease-in-out infinite;
      &:nth-child(2) { animation-delay: 0.15s; }
      &:nth-child(3) { animation-delay: 0.3s; }
    }
  }
  @keyframes bubble-typing {
    0%, 60%, 100% { translate: 0 0; opacity: 0.45; }
    30% { translate: 0 -0.25rem; opacity: 1; }
  }
}

@media (prefers-reduced-motion: reduce) {
  @layer components {
    .bubble-typing > span { animation: none; opacity: 0.7; }
    .bubble-more::details-content { transition: none; }
    .bubble-content:is(a, button) { transition: none; }
  }
}

@media (prefers-contrast: more) {
  @layer components {
    .bubble-content { border-color: var(--foreground); }
    .bubble[data-variant="ghost"] > .bubble-content { border-color: transparent; }
  }
}

@media (forced-colors: active) {
  @layer components {
    .bubble-content { border: 1px solid CanvasText; background: Canvas; color: CanvasText; }
    .bubble[data-variant="default"] > .bubble-content, .bubble:not([data-variant]) > .bubble-content { background: Highlight; color: HighlightText; forced-color-adjust: none; }
    .bubble-content::before { display: none; }
    .bubble-reactions { box-shadow: none; border: 1px solid CanvasText; }
  }
}