/* Memory Library — base: reset, typography, grid, primitives */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-fg);
  font-family: var(--font-editorial);
  font-size: var(--size-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; display: block; }

h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; padding: 0; }
ul, ol { list-style: none; }

a, a:link, a:visited {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

input, select {
  font: inherit;
  color: inherit;
}

/* ---- focus ---- */
:focus { outline: none; }
:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--c-library-black);
  color: var(--c-archive-white);
  padding: var(--space-3) var(--space-4);
  z-index: 100;
  font-family: var(--font-mono);
  font-size: var(--size-small);
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---- typography ---- */
.t-display {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--size-display);
  line-height: var(--leading-tight);
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

.t-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--size-title);
  line-height: var(--leading-title);
}

.t-intro {
  font-family: var(--font-editorial);
  font-weight: 400;
  font-size: var(--size-intro);
  line-height: var(--leading-title);
}

.t-body {
  font-family: var(--font-editorial);
  font-size: var(--size-body);
  line-height: var(--leading-body);
}

.t-small {
  font-family: var(--font-editorial);
  font-size: var(--size-small);
  line-height: var(--leading-body);
}

.t-meta {
  font-family: var(--font-mono);
  font-size: var(--size-meta);
  line-height: var(--leading-meta);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
}

.measure { max-width: var(--measure); }

/* ---- layout ---- */
.wrap {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--margin);
}

.grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-cols), 1fr);
  gap: var(--grid-gap);
}

/* Ad-hoc editorial layouts place explicit inline grid-column spans on
   .grid children. Below 760px those always stack full-width — inline
   styles need !important to be overridden here. */
@media (max-width: 760px) {
  .grid > * { grid-column: 1 / -1 !important; grid-row: auto !important; }
}

section { position: relative; }

.section-pad { padding-block: var(--space-24); }
.section-pad-sm { padding-block: var(--space-12); }

/* ---- tone backgrounds: "different paper stocks" ---- */
.tone-paper { background: var(--c-paper-white); }
.tone-foxed { background: var(--c-foxed-paper); }
.tone-blue { background: var(--c-faded-blue); }
.tone-mint { background: var(--c-desat-mint); }
.tone-black { background: var(--c-library-black); color: var(--c-archive-white); }

/* ---- rule ---- */
.rule {
  border: 0;
  border-top: 1px solid var(--c-line);
}
.rule-strong { border-top: 1px solid var(--c-line-strong); }

/* ---- media plate: placeholder for media not yet supplied ----
   A high-resolution toned placeholder photograph stands in for real
   photography/film. It is deliberately abstract (a soft gradient field,
   not a representational stock photo) so it cannot be mistaken for real
   documentation — but it is a genuine photographic image, not a flat
   colour swatch, so scale/crop/hover behaviour can be judged for real. */
.media-plate {
  position: relative;
  width: 100%;
  aspect-ratio: var(--plate-ratio, 4 / 3);
  background: var(--plate-bg, var(--c-paper-white));
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.media-plate .plate-photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.0001); /* establishes a GPU layer so the hover scale below is smooth */
  transition: transform var(--dur-slow) var(--ease);
}
.media-plate:hover .plate-photo,
.media-plate:focus-within .plate-photo {
  transform: scale(1.018);
}
.media-plate::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(17,17,17,0.45) 0%, rgba(17,17,17,0.08) 40%, transparent 65%);
  opacity: 0.55;
  transition: opacity var(--dur-base) var(--ease);
}
.media-plate:hover::after,
.media-plate:focus-within::after {
  opacity: 0.85;
}
.media-plate .plate-caption {
  position: relative;
  z-index: 1;
  padding: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--size-meta);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--c-archive-white);
  opacity: 0.7;
  transition: opacity var(--dur-base) var(--ease);
}
.media-plate:hover .plate-caption,
.media-plate:focus-within .plate-caption {
  opacity: 1;
}
@media (prefers-reduced-motion: reduce) {
  .media-plate .plate-photo { transition: none; }
  .media-plate:hover .plate-photo, .media-plate:focus-within .plate-photo { transform: none; }
}

/* Hero variant: full-bleed image, caption sits below as plain text
   rather than overlaid — used for the largest, most important images. */
.media-plate--hero {
  align-items: stretch;
}
.media-plate--hero::after { display: none; }
.media-plate--hero .plate-caption { display: none; }
.media-plate--hero-caption {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--size-meta);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  opacity: 0.6;
}

/* ---- media figure with real photography ---- */
figure.photo { margin: 0; }
figure.photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
figure.photo figcaption {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--size-meta);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--c-charcoal);
  opacity: 0.7;
}

/* ---- scroll-entry choreography ----
   Applied selectively (see comments in each page) — not every section
   moves. Respects prefers-reduced-motion; JS adds .is-visible once, on
   first intersection, so this never re-triggers on scroll-back. */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---- links within body copy ---- */
.link-underline {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--c-line-strong);
}
.link-underline:hover { text-decoration-color: currentColor; }