:root {
  --bg: #f6f6f7;
  --card: #ffffff;
  --ink: #16181c;
  --ink-dim: #5b6470;
  --line: #e2e4e8;
  --accent-ink: #ffffff;
  --radius: 14px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0e11;
    --card: #16181d;
    --ink: #e9ebee;
    --ink-dim: #949cab;
    --line: #262a31;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: max(12px, env(safe-area-inset-top)) 12px calc(24px + env(safe-area-inset-bottom));
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main { max-width: 680px; margin: 0 auto; }

.post {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

/* ---------- header ---------- */

.post__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.badge { display: inline-flex; align-items: center; gap: 8px; flex: none; }

.badge__mark {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
}

.badge__label { font-size: 13px; font-weight: 600; letter-spacing: 0.01em; }

.who { display: flex; align-items: center; gap: 8px; min-width: 0; margin-left: auto; }
.who__avatar { width: 28px; height: 28px; border-radius: 50%; flex: none; }
.who__names { display: flex; flex-direction: column; min-width: 0; text-align: right; }
.who__name { font-size: 13px; font-weight: 600; }
.who__name, .who__handle { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.who__handle { font-size: 12px; color: var(--ink-dim); }

/* ---------- text ---------- */

.text {
  padding: 14px;
  font-size: 16px;
  white-space: normal;
  overflow-wrap: anywhere;
}

.text a { color: inherit; text-decoration-color: var(--ink-dim); text-underline-offset: 2px; }

/* ---------- media ---------- */

/* Card-coloured, not black: whatever space the media does not fill should
   read as part of the page rather than as a border around it. */
.media { border-block: 1px solid var(--line); background: var(--card); }
.post__head + .media, .text + .media { border-top: 1px solid var(--line); }

.media__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

.media__count { font-size: 12px; color: var(--ink-dim); font-variant-numeric: tabular-nums; }

.media__views { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }

.media__view {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-dim);
  font: inherit;
  font-size: 12px;
  padding: 5px 12px;
  cursor: pointer;
}

.media__view[aria-pressed="true"] { background: var(--ink); color: var(--card); }

/* Swipe is the default, and needs no JavaScript to work. */
.media__rail {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}

.media__rail::-webkit-scrollbar { display: none; }

.item {
  flex: 0 0 100%;
  scroll-snap-align: center;
  scroll-snap-stop: always;
  margin: 0;
  display: grid;
  place-items: center;
  position: relative;
  min-width: 0;
  min-height: 0;
}

/* Sized by its own proportions rather than stretched to the column: a
   portrait video filling the width is mostly empty space either side of it.
   The cap keeps any single item within the window. */
.item img, .item video {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 70vh;
  max-height: 70dvh;
  object-fit: contain;
  background: transparent;
}

.item__note {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  padding: 4px 8px;
  font-size: 11px;
  color: #cfd4dc;
  background: rgba(0, 0, 0, 0.55);
}

.media[data-view="grid"] .media__rail {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 2px;
  overflow: visible;
}

.media[data-view="grid"] .item {
  aspect-ratio: 1 / 1;
  cursor: zoom-in;
  overflow: hidden;
}

/*
 * Filled absolutely rather than with height: 100%. The cell's height comes
 * from its aspect-ratio, which a percentage height will not resolve against,
 * and `aspect-ratio: auto` means "use the image's own" rather than "ignore
 * ratios" -- between them a portrait thumbnail ends up twice the height of
 * its cell.
 */
.media[data-view="grid"] .item img,
.media[data-view="grid"] .item video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  min-height: 0;
  object-fit: cover;
  aspect-ratio: auto !important;
}
.media[data-view="grid"] .item__note { display: none; }

/* ---------- footer ---------- */

.post__foot { padding: 14px; display: flex; flex-direction: column; gap: 12px; }
.post__foot time { font-size: 12px; color: var(--ink-dim); }

.original { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; }

.copy, .original__open {
  appearance: none;
  font: inherit;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid var(--line);
}

.copy { background: var(--ink); color: var(--card); border-color: var(--ink); }
.copy[data-copied] { background: #1a7f4b; border-color: #1a7f4b; }
.original__open { background: transparent; color: var(--ink); }

.original__url { flex-basis: 100%; margin: 0; }
.original__url code {
  font-size: 12px;
  color: var(--ink-dim);
  overflow-wrap: anywhere;
  user-select: all;
}

/* ---------- error and index ---------- */

.error__heading { font-size: 18px; margin: 14px; }
.error__detail { margin: 0 14px 14px; color: var(--ink-dim); font-size: 14px; }
.post--error .post__head:empty { display: none; }

.post--index { padding: 18px; }
.index__title { margin: 0; font-size: 20px; }
.index__lede { color: var(--ink-dim); font-size: 14px; }
.index__table { width: 100%; border-collapse: collapse; font-size: 13px; }
.index__table th { text-align: left; color: var(--ink-dim); font-weight: 600; padding: 6px 8px 6px 0; }
.index__table td { padding: 8px 8px 8px 0; border-top: 1px solid var(--line); vertical-align: middle; }
.index__table code { overflow-wrap: anywhere; }

/* ---------- verification puzzle ---------- */

.challenge__lede { margin: 14px; font-size: 14px; color: var(--ink-dim); }

.challenge__stage {
  position: relative;
  display: grid;
  place-items: center;
  padding: 8px;
  background: #000;
  border-block: 1px solid var(--line);
  min-height: 160px;
}

.challenge__stage img {
  max-width: 100%;
  /* The puzzle is a drag target, so the browser must not claim the gesture
     for scrolling or image-dragging. */
  touch-action: none;
  user-select: none;
  -webkit-user-drag: none;
  cursor: grab;
}

.challenge__stage img:active { cursor: grabbing; }

.challenge__status {
  position: absolute;
  bottom: 8px;
  margin: 0;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  color: #e9ebee;
  background: rgba(0, 0, 0, 0.65);
}

/* ---------- threads ---------- */

.segment + .segment { border-top: 1px solid var(--line); }

/* A chain reads as one column of posts, so the media in each needs its own
   top edge only when text sits above it. */
.segment .text + .media { border-top: 1px solid var(--line); }

.post[data-segments] .segment { position: relative; }

.segment__mark {
  margin: 0;
  padding: 8px 14px 0;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.post[data-segments] .segment[data-anchor="true"] {
  /* The link may point at the middle of a thread, so say which one it was
     without hiding the rest. */
  background: color-mix(in srgb, var(--accent, #888) 7%, transparent);
}

/* ---------- fitting the window ---------- */

/*
 * On a large screen a single post should be readable without scrolling to
 * find it -- a video especially, which you can full-screen if you want it
 * bigger.
 *
 * The cap is the window less the chrome around the media: header, caption and
 * footer come to roughly 270-350px on the posts this serves. Deriving it
 * instead of subtracting a constant is the obvious thing to try and does not
 * work: the card is sized by its contents, so a percentage height inside it
 * resolves to auto and clamps nothing.
 *
 * A thread is a column of several posts and cannot fit whatever we do, so it
 * keeps the looser cap above and scrolls.
 */
@media (min-width: 700px) and (min-height: 560px) {
  .post:not([data-segments]) .item img,
  .post:not([data-segments]) .item video {
    max-height: calc(100vh - 350px);
    max-height: calc(100dvh - 350px);
    /* Below that the media would be too small to be worth showing; better to
       let a very long caption scroll. */
    min-height: 220px;
  }
}

/* ---------- a post with a headline ---------- */

/* Reddit is the one platform where the post has a title and the body is
   optional, so the headline has to carry on its own. */
.text__title {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.3;
  font-weight: 650;
}

.text__title:only-child { margin-bottom: 0; }

/* ---------- comments ---------- */

.thread {
  margin-top: 12px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.thread__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.thread__title { margin: 0; font-size: 15px; font-weight: 650; }
.thread__count { font-size: 12px; color: var(--ink-dim); }

.thread__toggle {
  appearance: none;
  margin-left: auto;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-dim);
  font: inherit;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.thread__list { padding: 6px 14px 14px; }

.c { margin-top: 10px; }

/* The whole byline is the hit target for folding, so it wants to look like
   one thing rather than a row of separate labels. */
.c__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 8px;
  font-size: 12px;
  color: var(--ink-dim);
  cursor: pointer;
  list-style: none;
  padding: 2px 0;
  user-select: none;
}

.c__head::-webkit-details-marker { display: none; }

.c__head::before {
  content: "–";
  display: inline-grid;
  place-items: center;
  width: 15px;
  height: 15px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 11px;
  line-height: 1;
  color: var(--ink-dim);
  flex: none;
}

.c:not([open]) > .c__head::before { content: "+"; }

.c__author { font-weight: 600; color: var(--ink); }
.c__hidden { font-variant-numeric: tabular-nums; }
.c[open] > .c__head .c__hidden { display: none; }

.c__mark {
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--accent-ink);
  background: var(--ink-dim);
}

.c__mark--op { background: #ff4500; }
.c__mark--mod, .c__mark--admin { background: #1a7f4b; }

.c__body { font-size: 15px; overflow-wrap: anywhere; }
.c__body > :first-child { margin-top: 4px; }
.c__body > :last-child { margin-bottom: 0; }
.c__body p { margin: 0 0 8px; }
.c__body a { color: inherit; text-decoration-color: var(--ink-dim); text-underline-offset: 2px; }
.c__body ul, .c__body ol { margin: 0 0 8px; padding-left: 20px; }

.c__body blockquote {
  margin: 0 0 8px;
  padding-left: 10px;
  border-left: 3px solid var(--line);
  color: var(--ink-dim);
}

.c__body pre {
  margin: 0 0 8px;
  padding: 8px 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--ink) 6%, transparent);
  overflow-x: auto;
}

.c__body code { font-size: 13px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.c__body pre code { font-size: 12px; }

/* The rule down the left is what tells you where a subtree ends, which is
   the thing a wall of replies otherwise makes you count indents for. */
.c__replies {
  margin: 6px 0 0 7px;
  padding-left: 11px;
  border-left: 1px solid var(--line);
}

.c__more { margin: 8px 0 0; font-size: 12px; color: var(--ink-dim); }

.thread__more {
  margin: 0;
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-dim);
}

@media (max-width: 520px) {
  .c__replies { margin-left: 4px; padding-left: 7px; }
}

/* ---------- a quoted post ---------- */

/*
 * A post inside a post. Bordered and inset rather than merely indented,
 * because the whole job of this block is to be unmistakably someone else's
 * — an indent alone reads as a continuation of the words above it.
 */
.quote {
  margin: 0 14px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.text + .quote, .media + .quote { margin-top: 14px; }

.quote__who {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 6px;
  padding: 10px 12px 0;
  font-size: 13px;
  min-width: 0;
}

.quote__avatar {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  flex: none;
  align-self: center;
}

.quote__name { font-weight: 600; }
.quote__handle, .quote__who time { color: var(--ink-dim); font-size: 12px; }
.quote__text { padding: 6px 12px 10px; font-size: 15px; overflow-wrap: anywhere; }
.quote__text a { color: inherit; text-decoration-color: var(--ink-dim); text-underline-offset: 2px; }

/* Its own media sits flush in the block, the way the post's own does in the
   card, so the two read as the same kind of thing at different sizes. */
.quote .media { border-bottom: 0; }
.quote__text + .media, .quote__who + .media { border-top: 1px solid var(--line); }

.quote__open {
  display: block;
  padding: 9px 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-dim);
  text-decoration: none;
}

/*
 * Deliberately smaller than the post's own media, and after the window-fitting
 * rule above so it wins on source order at equal specificity. A quote is
 * context for the post, and context that fills the screen has stopped being
 * context.
 */
.post .quote .item img,
.post .quote .item video {
  max-height: 40vh;
  max-height: 40dvh;
  min-height: 0;
}

/*
 * A post that quotes another has two things to show, so its own media gives
 * up the window-filling cap above. Left at full height the quote starts below
 * the fold, which is the same as not having it — the whole reason it is here
 * is that neither half reads without the other.
 */
.segment[data-quoted] .item img,
.segment[data-quoted] .item video {
  max-height: 45vh;
  max-height: 45dvh;
  min-height: 0;
}