/* pastr: Poster Wall. One grid, one ink, one signal colour per paste, one bar. */

:root {
  --ground: #ffffff;
  --ink: #111111;
  --ink-soft: #5a5a5a;
  --red: #d52b1e;
  --blue: #0047bb;
  --green: #00703c;
  --orange: #c2410c;
  --signal: var(--red);

  --font: "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  --measure: 66ch;
  --step--1: 0.875rem;
  --step-0: 1.125rem;
  --step-1: 1.5rem;
  --step-2: 2.25rem;
  --step-3: clamp(2.5rem, 9vw, 6rem);
  --unit: 0.5rem;
  --rule: 2px;
  --bar: calc(var(--unit) * 1.5);
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0d0d0d;
    --ink: #f5f5f5;
    --ink-soft: #a8a8a8;
    --red: #ff5a4d;
    --blue: #6ea1ff;
    --green: #3ecf8e;
    --orange: #ff8a3d;
  }
}

.signal-red { --signal: var(--red); }
.signal-blue { --signal: var(--blue); }
.signal-green { --signal: var(--green); }
.signal-orange { --signal: var(--orange); }

/* Base */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scrollbar-color: var(--ink) var(--ground);
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: var(--step-0) / 1.55 var(--font);
  caret-color: var(--signal);
  text-rendering: optimizeLegibility;
}

::selection { background: var(--signal); color: var(--ground); }

:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
}

main {
  padding: clamp(2rem, 8vh, 5rem) var(--gutter) 6rem;
}

h1, h2, p, ul, ol, blockquote, fieldset { margin: 0; }
h2 { font-size: var(--step-1); line-height: 1.15; letter-spacing: -0.01em; }

a { color: inherit; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* The poster: headline, bar, meta */

.poster { max-width: 46rem; }
/* The compose column is exactly as wide as the editor, so title, bar and text share one right edge. */
.compose { max-width: calc(var(--measure) + 2.2rem + 2 * var(--rule)); }
.index { max-width: 60rem; }

/* On a wide sheet the read page uses the whole grid: headline and bar across,
   then the facts in a narrow column beside the text. */
.poster--read, .poster--gone { max-width: 72rem; }
@media (min-width: 64rem) {
  .poster--read {
    display: grid;
    grid-template-columns: 13rem minmax(0, var(--measure));
    column-gap: 4rem;
  }
  .poster--read .poster__head { display: contents; }
  .poster--read .poster__title, .poster--read .bar { grid-column: 1 / -1; }
  .poster--read .poster__meta {
    grid-column: 1;
    flex-direction: column;
    align-self: start;
    gap: calc(var(--unit) * 0.75);
    margin-top: calc(var(--unit) * 6);
    padding-top: var(--unit);
    border-top: var(--rule) solid var(--ink);
    color: var(--ink);
    font-weight: 700;
  }
  .poster--read > .prose, .poster--read > .reveal { grid-column: 2; }
  .poster--read > .reveal > .reveal__control { max-width: 24rem; }
}

.poster__title {
  font-size: var(--step-3);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.03em;
  text-wrap: balance;
  overflow-wrap: anywhere;
}

.bar {
  height: var(--bar);
  margin-top: calc(var(--unit) * 3);
  background: var(--signal);
}

.poster__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0 calc(var(--unit) * 3);
  margin-top: calc(var(--unit) * 2);
  color: var(--ink-soft);
  font-size: var(--step--1);
  font-variant-numeric: tabular-nums;
}

.poster__byline { color: var(--ink); font-weight: 700; }

/* Reading column */

.prose {
  max-width: var(--measure);
  margin-top: calc(var(--unit) * 6);
  overflow-wrap: anywhere;
  hanging-punctuation: first;
}

.prose > * + * { margin-top: 1em; }
.prose h2 { margin-top: 2em; }
.prose h2 + * { margin-top: 0.5em; }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose li + li { margin-top: 0.35em; }
.prose blockquote {
  padding-left: 1em;
  border-left: var(--rule) solid var(--ink);
  font-style: italic;
}
.prose a, .link {
  text-decoration: underline;
  text-decoration-thickness: var(--rule);
  text-underline-offset: 0.18em;
}
.prose a:hover, .link:hover { text-decoration-color: var(--signal); }

/* Tap to reveal */

.reveal { margin-top: calc(var(--unit) * 6); }
.reveal .prose { margin-top: calc(var(--unit) * 4); }

.reveal__control {
  display: flex;
  align-items: center;
  min-height: 3.5rem;
  padding: 0 1.25rem;
  background: var(--ink);
  color: var(--ground);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: -0.01em;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.reveal__control::-webkit-details-marker { display: none; }
.reveal__control:hover { background: var(--signal); }
.reveal__control .when-open { display: none; }

.reveal[open] > .reveal__control {
  display: inline-flex;
  min-height: 2.75rem;
  padding: 0;
  background: none;
  color: var(--ink-soft);
  font-size: var(--step--1);
  text-decoration: underline;
  text-decoration-thickness: var(--rule);
  text-underline-offset: 0.18em;
}
.reveal[open] > .reveal__control .when-closed { display: none; }
.reveal[open] > .reveal__control .when-open { display: inline; }

/* Gone */

.poster--gone .bar--strike { mix-blend-mode: multiply; }
@media (prefers-color-scheme: dark) {
  .poster--gone .bar--strike { mix-blend-mode: screen; }
}
.poster--gone .bar--strike {
  translate: 0 calc(-1 * (var(--unit) * 3 + var(--step-3) * 0.36 + var(--bar) / 2));
}
.poster--gone .poster__meta { margin-top: calc(var(--unit) * 4); font-size: var(--step-0); }

/* Signed-in pages */

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 clamp(0.9rem, 4vw, 1.5rem);
  padding: calc(var(--unit) * 1.5) var(--gutter);
  border-bottom: var(--rule) solid var(--ink);
  font-size: var(--step--1);
  font-weight: 700;
}
.nav a, .nav button {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  text-decoration: none;
}
.nav a:hover, .nav button:hover { text-decoration: underline; text-decoration-thickness: var(--rule); text-underline-offset: 0.3em; text-decoration-color: var(--signal); }
.nav form { margin-left: auto; }

.index .poster__title, .poster--form .poster__title, .poster--ready .poster__title {
  font-size: var(--step-2);
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.index__head { display: grid; }
.index__head .button { justify-self: start; margin-top: calc(var(--unit) * 4); }

.index__list {
  margin-top: calc(var(--unit) * 5);
  padding: 0;
  list-style: none;
  border-bottom: var(--rule) solid var(--ink);
}

.index__row {
  display: grid;
  gap: calc(var(--unit) * 0.5) calc(var(--unit) * 3);
  padding: calc(var(--unit) * 2.5) 0;
  border-top: var(--rule) solid var(--ink);
}
@media (min-width: 40rem) {
  .index__row { grid-template-columns: 1fr auto; align-items: end; }
  .index__title, .index__meta { grid-column: 1; }
  .index__actions { grid-column: 2; grid-row: 1 / span 2; }
}

.index__title {
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  text-decoration: none;
  overflow-wrap: anywhere;
}
a.index__title::before {
  content: "";
  display: block;
  width: 5rem;
  height: calc(var(--unit) * 0.75);
  margin-bottom: var(--unit);
  background: var(--signal);
  transform: scaleX(0.5);
  transform-origin: left;
}
a.index__title:hover::before, a.index__title:focus-visible::before { transform: none; }

.index__meta {
  color: var(--ink-soft);
  font-size: var(--step--1);
  font-variant-numeric: tabular-nums;
}

.index__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--unit) calc(var(--unit) * 3);
  font-size: var(--step--1);
  font-weight: 700;
}
.index__actions form { display: flex; flex-wrap: wrap; align-items: center; gap: var(--unit) calc(var(--unit) * 1.5); }
.index__actions input { width: 11rem; min-height: 2.75rem; padding: 0.4rem 0.6rem; font-size: var(--step--1); }

.empty { margin-top: calc(var(--unit) * 5); }
.empty p { max-width: 34ch; font-size: var(--step-1); line-height: 1.25; font-weight: 700; letter-spacing: -0.01em; }

/* Forms */

.form { display: grid; gap: calc(var(--unit) * 3); margin-top: calc(var(--unit) * 5); max-width: 28rem; }
.form + .form { margin-top: calc(var(--unit) * 8); }
.form > p { color: var(--ink-soft); font-size: var(--step--1); margin-top: calc(var(--unit) * -2); }
.index > h2 { margin-top: calc(var(--unit) * 8); }

.field { display: grid; gap: calc(var(--unit) * 0.75); }
.field > span, legend { font-size: var(--step--1); font-weight: 700; }
.field small { color: var(--ink-soft); font-size: var(--step--1); }

input:not([type="radio"], [type="hidden"]), textarea {
  width: 100%;
  min-height: 3rem;
  padding: 0.6rem 0.75rem;
  border: var(--rule) solid var(--ink);
  border-radius: 0;
  background: var(--ground);
  color: var(--ink);
  font: inherit;
  appearance: none;
}
input::placeholder, textarea::placeholder { color: var(--ink-soft); opacity: 1; }
/* Square, ink-drawn radios: the form has no curves. */
input[type="radio"] {
  flex: none;
  width: 1.25rem;
  height: 1.25rem;
  margin: 0;
  border: var(--rule) solid var(--ink);
  border-radius: 0;
  background: var(--ground);
  appearance: none;
}
input[type="radio"]:checked { background: var(--ink); box-shadow: inset 0 0 0 3px var(--ground); }
.choice label:has(:checked) { font-weight: 700; }

button { font: inherit; color: inherit; cursor: pointer; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  justify-self: start;
  min-height: 3rem;
  padding: 0 1.5rem;
  border: 0;
  border-radius: 0;
  background: var(--ink);
  color: var(--ground);
  font-weight: 700;
  text-decoration: none;
}
.button:hover { background: var(--signal); }
.button.is-copied { background: var(--signal); }

.link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0;
  border: 0;
  background: none;
  font-weight: 700;
}
.link--danger { color: var(--ink-soft); }
.link--danger:hover { color: var(--ink); }

.form-error, .form-notice {
  max-width: 28rem;
  margin-top: calc(var(--unit) * 4);
  padding: calc(var(--unit) * 1.5) calc(var(--unit) * 2);
  border: var(--rule) solid var(--ink);
  font-size: var(--step--1);
}
.form-error { background: var(--ink); color: var(--ground); font-weight: 700; }
.form-notice::before { content: "Done. "; font-weight: 700; }

/* Compose */

.compose .form { max-width: none; margin-top: 0; }
.compose .form > * { min-width: 0; }
.compose .form-error { margin: 0 0 calc(var(--unit) * 4); }

.field--title textarea.poster__title {
  min-height: 0;
  padding: 0;
  border: 0;
  overflow: hidden;
  resize: none;
  field-sizing: content;
  font-family: var(--font);
}
.field--title textarea.poster__title:focus-visible { outline-offset: 6px; }
.compose .bar { margin-top: 0; }
.hint { color: var(--ink-soft); font-size: var(--step--1); margin-top: calc(var(--unit) * -1.5); }

.compose trix-toolbar { margin-top: calc(var(--unit) * 2); }
.compose trix-toolbar .trix-button-row { flex-wrap: wrap; justify-content: flex-start; gap: var(--unit); }
.compose trix-toolbar .trix-button-group {
  margin: 0;
  border: var(--rule) solid var(--ink);
  border-radius: 0;
}
.compose trix-toolbar .trix-button-group-spacer { display: none; }
.compose trix-toolbar .trix-button {
  min-width: clamp(2.3rem, 10vw, 2.75rem);
  min-height: 2.75rem;
  border: 0;
  border-radius: 0;
  background: var(--ground);
  color: var(--ink);
}
.compose trix-toolbar .trix-button:not(:first-child) { border-left: var(--rule) solid var(--ink); }
/* Trix's icons are dark artwork, so they are inverted wherever the face behind them
   is dark: on the active (ink-filled) button in light, on every other button in dark. */
.compose trix-toolbar .trix-button.trix-active { background: var(--ink); }
.compose trix-toolbar .trix-button--icon::before { opacity: 1; }
.compose trix-toolbar .trix-button.trix-active::before { filter: invert(1); }
@media (prefers-color-scheme: dark) {
  .compose trix-toolbar .trix-button--icon::before { filter: invert(1); }
  .compose trix-toolbar .trix-button.trix-active::before { filter: none; }
}
.compose trix-toolbar .trix-dialog {
  border: var(--rule) solid var(--ink);
  border-radius: 0;
  box-shadow: none;
  background: var(--ground);
  color: var(--ink);
}
.compose trix-toolbar .trix-dialog .trix-button { border: var(--rule) solid var(--ink); padding: 0 0.75rem; }

.compose trix-editor.prose {
  /* The reader's measure, so the author sees the reader's line breaks. */
  max-width: calc(var(--measure) + 2.2rem + 2 * var(--rule));
  min-height: 16rem;
  margin-top: 0;
  padding: 1rem 1.1rem;
  border: var(--rule) solid var(--ink);
  border-radius: 0;
}
.compose trix-editor.prose > * + * { margin-top: 1em; }
.compose trix-editor h1 { font-size: var(--step-1); line-height: 1.15; margin: 0; }

.settings {
  display: grid;
  gap: calc(var(--unit) * 4);
  padding-top: calc(var(--unit) * 2);
}
@media (min-width: 48rem) {
  .settings { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.choice { display: grid; gap: calc(var(--unit) * 0.5); padding: 0; border: 0; min-width: 0; }
.choice legend { padding: 0; margin-bottom: var(--unit); }
.choice label { display: flex; align-items: center; gap: calc(var(--unit) * 1.25); min-height: 2.75rem; }

.form--danger { margin-top: calc(var(--unit) * 6); }

/* Link ready */

.ready__title { margin-top: calc(var(--unit) * 4); color: var(--ink-soft); font-size: var(--step--1); }
.ready__url {
  min-height: 2.4em;
  margin: var(--unit) 0 calc(var(--unit) * 4);
  font-size: clamp(1.25rem, 4.6vw, 1.75rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
}
.ready__links { display: flex; flex-wrap: wrap; gap: 0 calc(var(--unit) * 3); margin-top: calc(var(--unit) * 4); font-size: var(--step--1); }

/* Living poster: four shapes that drift on the grid. Decorative, never on the read page. */

.living-poster {
  position: relative;
  height: 11rem;
  margin-top: calc(var(--unit) * 8);
  overflow: hidden;
  border-top: var(--rule) solid var(--ink);
}
.living-poster i { position: absolute; display: block; }
.living-poster i:nth-child(1) { left: 0; top: 22%; width: 58%; height: 1.5rem; background: var(--red); }
.living-poster i:nth-child(2) { left: 34%; top: 46%; width: 66%; height: 0.75rem; background: var(--blue); }
.living-poster i:nth-child(3) { left: 12%; top: 66%; width: 30%; height: 2.25rem; background: var(--green); }
.living-poster i:nth-child(4) {
  right: 6%; top: -3.5rem; width: 9rem; height: 9rem;
  border: 1.5rem solid var(--orange);
  border-radius: 50%;
  clip-path: inset(50% 0 0 0);
}

@media (min-width: 60rem) {
  .poster--form:has(.living-poster) {
    max-width: none;
    display: grid;
    grid-template-columns: minmax(0, 28rem) minmax(0, 1fr);
    column-gap: clamp(3rem, 8vw, 8rem);
  }
  .poster--form:has(.living-poster) > * { grid-column: 1; }
  .poster--form .living-poster {
    grid-column: 2;
    grid-row: 1 / span 6;
    height: auto;
    min-height: 24rem;
    margin-top: 0;
    border-top: 0;
    border-left: var(--rule) solid var(--ink);
  }
}

/* Motion. Everything here is optional: the page is complete without it. */

@media (prefers-reduced-motion: no-preference) {
  @view-transition { navigation: auto; }

  .button { transition: background-color 0.15s var(--ease); }
  .button:active { transform: translateY(1px); }
  a.index__title::before { transition: transform 0.2s var(--ease); }

  .bar { transform-origin: left; animation: bar-draw 0.5s var(--ease) both; }
  .poster--gone .bar--strike { animation: bar-draw 0.5s var(--ease) both, bar-strike 0.45s var(--ease) 0.55s backwards; }

  .poster--read .poster__title, .poster--gone .poster__title {
    animation: title-rise 0.3s var(--ease) both;
  }

  /* Reveal: a sheet of the signal colour crosses the screen; the text is there when it clears. */
  .reveal[open]::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 1;
    background: var(--signal);
    pointer-events: none;
    animation: wipe 0.42s cubic-bezier(0.7, 0, 0.3, 1) both;
  }
  .reveal[open] > .prose { animation: uncover 0.42s step-end both; }

  .button.is-copied { animation: copied 0.5s var(--ease); }

  .living-poster i:nth-child(1) { animation: drift-x 26s ease-in-out infinite alternate; }
  .living-poster i:nth-child(2) { animation: drift-x 34s ease-in-out infinite alternate-reverse; }
  .living-poster i:nth-child(3) { animation: drift-x 22s ease-in-out infinite alternate; }
  .living-poster i:nth-child(4) { animation: turn 40s linear infinite; }

  /* The paste being opened carries its title across to the editor headline. */
  .index__row:has(a.index__title:is(:hover, :focus-visible, :active)) .index__title,
  .field--title .poster__title { view-transition-name: paste-title; }
}

/* Draw and strike use separate transform properties so they can run on one element. */
@keyframes bar-draw { from { scale: 0 1; } }
@keyframes bar-strike { from { translate: 0 0; } }
@keyframes title-rise {
  from { transform: translateY(0.3em); clip-path: inset(0 0 100% 0); }
  to { transform: none; clip-path: inset(-0.3em); }
}
@keyframes wipe {
  0% { transform: translateX(-101%); }
  45%, 55% { transform: translateX(0); }
  100% { transform: translateX(101%); }
}
@keyframes uncover { from { visibility: hidden; } 50% { visibility: visible; } }
@keyframes copied { 0% { transform: scaleX(1); } 40% { transform: scaleX(1.04); } 100% { transform: scaleX(1); } }
@keyframes drift-x { from { transform: translateX(-12%); } to { transform: translateX(14%); } }
@keyframes turn { to { transform: rotate(360deg); } }