/*
  The preset and theme galleries, on top of site.css (fonts, palette, controls, header, footer):
  their own pieces and the few tokens only they use.
*/

/* --- tokens ----------------------------------------------------------------------------------- */

:root {
  --bg-deep: #e1e7f1;
  --panel: #f7f9fc;
  --panel-2: #e1e7f1;
  --border: #d5deeb;
  --border-strong: #c8d3e4;
  --accent-soft: rgba(47, 91, 208, 0.12);
  --good: #14804a;
  --shadow-sm: 0 1px 2px rgba(16, 30, 54, 0.06), 0 4px 12px rgba(16, 30, 54, 0.06);
  --shadow-md: 0 10px 30px rgba(16, 30, 54, 0.1);
  --radius-sm: 8px;
  --backdrop: linear-gradient(135deg, #223055, #3d3363 55%, #6d3b58);
}

/* System preference, unless the reader explicitly asked for light. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg-deep: #070c17;
    --panel: #111a2c;
    --panel-2: #18233a;
    --border: #212e4a;
    --border-strong: #2c3b5c;
    --accent-soft: rgba(108, 145, 255, 0.16);
    --good: #5fd49a;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 14px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 14px 34px rgba(0, 0, 0, 0.42);
  }
}

:root[data-theme='dark'] {
  --bg-deep: #070c17;
  --panel: #111a2c;
  --panel-2: #18233a;
  --border: #212e4a;
  --border-strong: #2c3b5c;
  --accent-soft: rgba(108, 145, 255, 0.16);
  --good: #5fd49a;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 14px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 14px 34px rgba(0, 0, 0, 0.42);
}

/* --- base ------------------------------------------------------------------------------------- */

/* The browser's `[hidden]` rule loses to any class that sets `display`, so script-hidden grids and
   panels stayed on screen. */
[hidden] {
  display: none !important;
}

body {
  font-size: 17px;
  line-height: 1.65;
  overflow-x: clip;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  font-stretch: 112%;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.4rem, 1.4rem + 3.4vw, 4rem);
}

h2 {
  font-size: clamp(1.75rem, 1.2rem + 1.8vw, 2.5rem);
}

h3 {
  font-size: 1.2rem;
}

p {
  margin: 0 0 1em;
}

/* Links in the page itself; the header and footer draw their own. */
main a {
  color: var(--accent);
  text-decoration: none;
}

main a:hover {
  text-decoration: underline;
}

/* A link in running text needs more than its colour to be found. */
p a:not([class]) {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
}

img,
svg,
iframe {
  max-width: 100%;
}

/* Form controls do not inherit the page font: without this every chip and button drew in Arial. */
button,
input,
select,
textarea {
  font-family: inherit;
}

hr {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--border);
}

code,
kbd {
  font-family: Consolas, 'Cascadia Mono', ui-monospace, monospace;
  font-size: 0.88em;
}

kbd {
  padding: 0.15em 0.45em;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--ink);
}

.wrap {
  width: min(1180px, 100% - 48px);
  margin-inline: auto;
}

.narrow {
  width: min(760px, 100%);
}

.section {
  padding-block: clamp(64px, 8vw, 116px);
}

/* The footer brings its own space above it. */
main > .section:last-child {
  padding-bottom: 0;
}

/* The header is sticky, so an in-page link would otherwise land with its heading underneath it. */
.section[id],
#main {
  scroll-margin-top: 84px;
}

.section-alt {
  background: var(--bg-deep);
  border-block: 1px solid var(--border);
}

.lead {
  font-size: 1.12rem;
  color: var(--muted);
  max-width: 62ch;
}

.section-head {
  margin-bottom: clamp(32px, 4vw, 56px);
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 0.92rem;
}

/* --- layout ----------------------------------------------------------------------------------- */

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 30px;
}

/* A wide window gets a wider page, so the product beside the words is not a small picture. */
@media (min-width: 1500px) {
  .wrap {
    width: min(1320px, 100% - 96px);
  }
}

/* --- points and columns ------------------------------------------------------------------------ */

.feature-points {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.feature-points li {
  position: relative;
  padding-left: 26px;
  font-size: 0.97rem;
}

.feature-points li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 12px;
  height: 3px;
  border-radius: 2px;
  background: var(--accent);
}

/* Two columns of ordinary prose, stacking on a narrow screen. */
.split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.split h3 {
  margin-bottom: 10px;
}

.split p {
  color: var(--muted);
  max-width: 52ch;
}

/* --- chips ------------------------------------------------------------------------------------ */

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* --- gallery ---------------------------------------------------------------------------------- */

.gallery-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 26px;
}

.field {
  position: relative;
  flex: 1 1 320px;
  max-width: 400px;
}

.field input {
  width: 100%;
  padding: 12px 14px 12px 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  font: inherit;
  font-size: 0.98rem;
}

.field input::placeholder {
  color: var(--muted);
}

.field svg {
  position: absolute;
  left: 13px;
  top: 50%;
  width: 17px;
  height: 17px;
  transform: translateY(-50%);
  fill: var(--muted);
  pointer-events: none;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 20px;
}

/* The cards' place while the listing loads, so nothing below drops when they arrive. */
.skeleton-card {
  display: block;
  min-height: 380px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(110deg, var(--panel) 30%, var(--panel-2) 50%, var(--panel) 70%) 0 0 / 220% 100%;
  animation: skeleton-sweep 1.6s ease-in-out infinite;
}

@keyframes skeleton-sweep {
  from {
    background-position: 120% 0;
  }
  to {
    background-position: -100% 0;
  }
}

/* While it loads, the line of text is for a screen reader: the placeholder cards are the picture. */
.empty[data-loading] {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  .skeleton-card {
    animation: none;
  }
}

.preset-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.preset-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.preset-card figure {
  position: relative;
  margin: 0;
  /* Close to the shape a rendered preview has, so the popup fills the card rather than floating
     in a band of backdrop. */
  aspect-ratio: 5 / 2;
  background: var(--backdrop);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.preset-card figure img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 6px;
  transition: transform 0.18s ease;
}

/*
  The preview is drawn at the size the popup or the window really has and the card shows it much
  smaller, so the frame opens it. It is a link to the picture, which is what a middle click follows.
*/
.preset-card figure .preview-zoom {
  display: block;
  width: 100%;
  height: 100%;
  cursor: zoom-in;
}

.preset-card figure .preview-zoom:hover img {
  transform: scale(1.03);
}

@media (prefers-reduced-motion: reduce) {
  .preset-card figure .preview-zoom:hover img {
    transform: none;
  }
}

/* The picture at its own size, over everything else. Escape and the backdrop come with dialog. */
.lightbox {
  max-width: min(96vw, 1280px);
  max-height: 92vh;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.lightbox::backdrop {
  background: rgba(8, 12, 22, 0.72);
}

.lightbox img {
  display: block;
  max-width: min(94vw, 1272px);
  max-height: 78vh;
  margin: 0 auto;
  background: var(--backdrop);
}

.lightbox-caption {
  margin: 0;
  padding: 12px 16px 4px;
  text-align: center;
  font-weight: 600;
}

/*
  What the picture is. A card is small enough that a reader takes it as decoration; opened, it is
  the size of a screenshot and reads as one, so this is where it has to be said that it was
  generated - and, for a theme, what it is showing at once.
*/
.lightbox-note {
  margin: 0 auto;
  padding: 0 20px 16px;
  max-width: 104ch;
  color: var(--muted);
  text-align: center;
  font-size: 0.86rem;
  line-height: 1.5;
}

.lightbox-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  background: var(--panel);
  color: var(--ink);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
}

.lightbox-close:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.preset-card .body {
  display: flex;
  flex-direction: column;
  flex: 1;
  gap: 8px;
  padding: 18px 20px 20px;
}

.preset-card h3 {
  margin: 0;
  font-size: 1.1rem;
}

.preset-card .by {
  font-size: 0.88rem;
  color: var(--muted);
}

.preset-card .desc {
  margin: 0;
  font-size: 0.94rem;
  color: var(--muted);
  flex: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag {
  padding: 3px 9px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-2);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-transform: lowercase;
}

/* A theme card says what the picture cannot: the palette that will be installed, and whether the
   file carries images or is colours only. Both are read out of the package. */
.theme-facts {
  display: flex;
  align-items: center;
  gap: 10px;
}

.swatches {
  display: inline-flex;
  gap: 4px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-2);
}

.swatch {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  /* A colour out of a listing may be anything, including nothing: the ring keeps an unpainted
     chip visible instead of leaving a hole in the strip. */
  box-shadow: inset 0 0 0 1px rgba(127, 127, 127, 0.35);
}

.preset-card footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.preset-card footer .btn {
  padding: 10px 16px;
  font-size: 0.94rem;
}

.file-meta {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: right;
  white-space: nowrap;
}

.empty {
  display: grid;
  justify-items: center;
  gap: 6px;
  padding: 40px 28px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  text-align: center;
  color: var(--muted);
}

/* An outline of a popup: the shape the page would be full of if there were anything to show. */
.empty::before {
  content: '';
  width: 46px;
  height: 22px;
  margin-bottom: 10px;
  border: 2px dashed var(--border-strong);
  border-radius: 6px;
}

.empty h3 {
  margin: 0;
  color: var(--ink);
}

.empty p {
  max-width: 46ch;
}

/* Only drawn when a gallery server answered: with none, a submission is a pull request. */
.submit-panel {
  display: grid;
  gap: 18px;
  margin-top: 26px;
  padding: 22px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
}

.submit-panel h3 {
  margin: 0 0 6px;
}

.submit-panel p {
  margin: 0;
  max-width: 68ch;
}

.submit-panel .row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

/*
  The file button hides its real input inside the label, so the label needs the focus ring it would
  have had. Only that one: the three text fields are focused directly and already take the global
  ring on the input itself, and a ring here drew a second box around the first.
*/
.submit-panel label.btn:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.submit-panel .good {
  color: var(--good);
}

.submit-panel .bad {
  color: #b3261e;
}

:root[data-theme='dark'] .submit-panel .bad {
  color: #ff8f8f;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .submit-panel .bad {
    color: #ff8f8f;
  }
}

/* The three optional fields beside the file button. */
.submit-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px 16px;
}

.field-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.field-block input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
}

.field-block input::placeholder {
  color: var(--muted);
  opacity: 0.75;
}

/*
  The one field that has to be filled in. The `required` attribute is what says so to a screen
  reader and to the browser; this is the mark everybody else reads, so it is decoration and is not
  translated.
*/
.field-block.is-required > span::after {
  content: ' *';
  color: var(--accent);
  font-weight: 700;
}

/* The file is picked and named here, and only Publish sends it with the fields above. */
.submit-file {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 14px;
}

.submit-file [data-upload-chosen] {
  margin: 0;
  min-width: 0;
  overflow-wrap: anywhere;
}

/* The panel says which of the two states it is in, so the file line reads as a fact once there is
   one and as an instruction while there is not. */
.submit-panel[data-has-file='true'] .submit-file [data-upload-chosen] {
  color: var(--ink);
  font-weight: 600;
}

/* A tag chip is one button: removing it is all it does, so the whole chip is the target and
   one tab stop. */
.field-tags {
  max-width: 640px;
}

.tag-input {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  cursor: text;
}

.tag-input:focus-within {
  border-color: var(--accent);
}

.tag-chips {
  display: contents;
  margin: 0;
  padding: 0;
  list-style: none;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px 4px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
}

.tag-chip:hover,
.tag-chip:focus-visible {
  border-color: var(--accent);
}

.tag-chip-x {
  font-size: 1rem;
  line-height: 1;
  opacity: 0.7;
}

/* The box grows into whatever the chips leave, and never shrinks below a word. */
.tag-input input {
  flex: 1 1 8ch;
  min-width: 8ch;
  padding: 4px 4px;
  border: 0;
  background: none;
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
}

.tag-input input:focus {
  outline: none;
}

.tag-input input:disabled::placeholder {
  opacity: 0;
}

/* Publish is inert until there is something to publish, and says so rather than failing on click. */
.submit-panel .btn[disabled] {
  opacity: 0.5;
  pointer-events: none;
}

/* The download count on a card: a figure, so it should not wrap away from its arrow. */
.file-meta .downloads {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  cursor: help;
}

/* Dropping the file on the panel is the shortest way to send one, so the panel says it is a target. */
.submit-panel[data-drop='true'] {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/*
  A submission takes a few seconds: the server draws the popup before it answers. The panel says so
  rather than looking unresponsive, and refuses a second file until the first has landed.
*/
.submit-panel[data-busy='true'] {
  pointer-events: none;
}

.submit-panel[data-busy='true'] .btn {
  opacity: 0.55;
}

.submit-panel[data-busy='true'] [data-gallery-upload-status]::after {
  content: '';
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  margin-left: 8px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  vertical-align: -1px;
  animation: aw-spin 0.9s linear infinite;
}

@keyframes aw-spin {
  to {
    transform: rotate(360deg);
  }
}

/* --- notes and callouts ----------------------------------------------------------------------- */

.note {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 6%, var(--panel));
}

.note svg {
  width: 20px;
  height: 20px;
  margin-top: 3px;
  fill: var(--accent);
}

.note p:last-child {
  margin-bottom: 0;
}

.steps {
  counter-reset: step;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.steps li {
  position: relative;
  padding-left: 46px;
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: -1px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--panel);
  font-family: var(--font);
  font-stretch: 112%;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--accent);
}

.steps b {
  display: block;
}

/* --- responsive ------------------------------------------------------------------------------- */

@media (max-width: 940px) {
  .wrap {
    width: min(1180px, 100% - 32px);
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .section {
    padding-block: 56px;
  }

  .preset-card footer {
    flex-wrap: wrap;
  }

  .file-meta {
    margin-left: 0;
    text-align: left;
  }
}

/* --- motion ----------------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}