/* The gallery of explorables: the site's front page, and /explorables/ on
 * the local server. tools/decks.py gallery() writes it. It takes its colours
 * and fonts from deck.css; these rules lay out a page that scrolls, unlike a
 * deck, with a card for each explorable. The cards take the lab's colours
 * in turn, like cards on a slide.
 */
html:has(body.gallery), body.gallery { height: auto; }
body.gallery { min-height: 100vh; overflow: auto; background: var(--bg); }
.gallery-head, .gallery main, .gallery-foot { max-width: 1180px; margin: 0 auto; padding-left: 32px; padding-right: 32px; }
.gallery-head { padding-top: 64px; padding-bottom: 40px; }
.gallery-head h1 { font-family: var(--f-cover); font-weight: 800; font-size: clamp(44px, 7vw, 76px); line-height: 1.05; color: var(--blue-tone); text-wrap: wrap; }
.gallery-head .lede { margin-top: 16px; font-size: clamp(18px, 2.2vw, 22px); line-height: 1.5; color: var(--ink-2); }

.explorables { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap: 28px; }
.explorable {
  position: relative; isolation: isolate; display: flex; flex-direction: column; overflow: hidden; border-radius: 18px; background: var(--surface);
  box-shadow: 0 0 0 1px var(--line), var(--shadow); --tint: var(--blue-tint); --tone: var(--blue-tone);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.explorable:nth-child(4n + 2) { --tint: var(--sun-tint); --tone: var(--sun-tone); }
.explorable:nth-child(4n + 3) { --tint: var(--rose-tint); --tone: var(--rose-tone); }
.explorable:nth-child(4n + 4) { --tint: var(--sea-tint); --tone: var(--sea-tone); }
/* A slide-shaped picture, or, without one, the paper's year on the card's tint. */
.explorable .cover { position: relative; display: block; aspect-ratio: 16 / 9; overflow: hidden; background: var(--tint); }
/* Out of the flow, so a picture of another shape is cropped to the card's, never stretches it. */
.explorable .cover img { position: absolute; inset: 0; display: block; width: 100%; height: 100%; object-fit: cover; }
.cover-year { display: grid; place-items: center; height: 100%; font-family: var(--f-num); font-size: 72px; font-weight: 800; color: var(--tone); }
.explorable .about { flex: 1; display: flex; flex-direction: column; gap: 8px; padding: 20px 24px 24px; }
.explorable h2 { font-family: var(--f-head); font-size: 26px; font-weight: 500; line-height: 1.2; }
.explorable h2 a { color: var(--ink); text-decoration: none; }
/* Stretch the title's native link over the entire card, with one keyboard stop. */
.explorable h2 a::after { content: ""; position: absolute; inset: 0; z-index: 1; }
.explorable h2 a:is(:hover, :focus-visible) { color: var(--tone); }
.explorable h2 a:focus-visible { outline: none; }
.explorable:has(h2 a:focus-visible) { outline: 3px solid var(--tone); outline-offset: 4px; }
@media (hover: hover) {
  .explorable:hover { transform: translateY(-4px); box-shadow: 0 0 0 1px var(--tone), 0 12px 28px rgba(30, 40, 60, 0.16); }
}
@media (prefers-reduced-motion: reduce) {
  .explorable { transition: none; }
  .explorable:hover { transform: none; }
}
.explorable .paper { font-size: 15px; line-height: 1.45; color: var(--ink-3); }
.explorable .paper-title { font-style: italic; color: var(--ink-2); }
.explorable .description { font-size: 17px; line-height: 1.5; color: var(--ink); }
.explorable .by { margin-top: auto; padding-top: 4px; font-size: 15px; font-weight: 500; color: var(--tone); white-space: pre-line; }

/* On the local server: drafts, and what to fix before an explorable is published. */
.badge { align-self: flex-start; padding: 2px 10px; border-radius: 999px; font-size: 13px; font-weight: 500; background: var(--surface-2); color: var(--ink-2); }
.badge.error { background: var(--rose-tint); color: var(--rose-tone); }
.badge.warning { background: var(--sun-tint); color: var(--sun-tone); }
/* Keep the local validation disclosure above the card's link. */
.problems { position: relative; z-index: 2; font-size: 14px; line-height: 1.45; }
.problems summary { cursor: pointer; color: var(--ink-2); }
.problems ul { margin: 8px 0 0; padding-left: 1.2em; }
.problems li { margin-bottom: 6px; }
.problems li.error::marker { color: var(--rose-tone); }
.problems li.warning::marker { color: var(--sun-tone); }
.problems b { font-weight: 600; margin-right: 4px; }

.gallery .empty { font-size: 18px; color: var(--ink-2); }
.gallery-foot { padding-top: 48px; padding-bottom: 56px; font-size: 15px; color: var(--ink-3); }
.gallery-foot p + p { margin-top: 8px; }
.gallery-foot code { font-size: 14px; }

/* The invitation stays distinct from the research gallery below it. */
.gallery .create-invitation { display: flex; align-items: center; gap: 32px; justify-content: space-between; margin-bottom: 36px; padding: 26px 30px; border-radius: 14px; background: var(--blue-tint); border-left: 4px solid var(--blue-tone); }
.gallery .create-invitation .invitation-kicker { font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--blue-tone); margin-bottom: 6px; }
.gallery .create-invitation h2 { font-family: var(--f-head); font-weight: 600; font-size: 24px; line-height: 1.25; margin-bottom: 8px; }
.gallery .create-invitation p { font-size: 16px; color: var(--ink-2); line-height: 1.5; }
.gallery .create-invitation p strong { display: block; margin-top: 4px; }
.gallery .create-invitation > a { flex-shrink: 0; display: inline-flex; gap: 18px; align-items: center; min-height: 48px; padding: 12px 20px; border-radius: 8px; background: var(--accent-2); color: var(--accent-ink); font-size: 17px; font-weight: 600; text-decoration: none; }
.gallery .create-invitation > a:hover { background: var(--accent); }
@media (max-width: 600px) {
  .gallery-head, .gallery main, .gallery-foot { padding-left: 16px; padding-right: 16px; }
  .gallery-head { padding-top: 40px; padding-bottom: 28px; }
  .gallery .create-invitation { flex-direction: column; align-items: flex-start; gap: 20px; padding: 22px; }
}