/* あいもげミュージアム — 夜の展示室。暖かい炭の壁にスポット、真鍮のプレート。 */

:root {
  --wall: #16130f;
  --wall-2: #1f1a14;
  --panel: #241e17;
  --ink: #ece4d4;
  --ink-dim: #b6a98f;
  --muted: #8c7f69;
  --brass: #cba24c;
  --brass-dim: #8f7331;
  --line: #392f25;
  --frame: #0d0b08;
  --shadow: rgba(0, 0, 0, 0.55);

  --display: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --body: "Zen Kaku Gothic New", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    system-ui, sans-serif;
  --mono: "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw: 1180px;
}

@media (prefers-color-scheme: light) {
  :root {
    --wall: #e9e3d6;
    --wall-2: #f1ece1;
    --panel: #f6f2e9;
    --ink: #2a241b;
    --ink-dim: #5f5644;
    --muted: #877c66;
    --brass: #8a6d23;
    --brass-dim: #ab8c3e;
    --line: #d4cab4;
    --frame: #cfc4ab;
    --shadow: rgba(60, 48, 28, 0.18);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--wall);
  color: var(--ink);
  font-family: var(--body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--brass); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brass);
  color: var(--frame);
  padding: 0.6rem 1rem;
  z-index: 50;
}
.skip-link:focus { left: 0; }

/* ---- masthead ---- */
.masthead {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 6rem) 1.5rem clamp(1.5rem, 4vw, 3rem);
  text-align: center;
  border-bottom: 1px solid var(--line);
}
.masthead__eyebrow {
  margin: 0 0 1.1rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--brass);
  padding-left: 0.42em;
}
.masthead__title {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.6rem, 7vw, 5rem);
  letter-spacing: 0.04em;
  line-height: 1.05;
}
.masthead__lede {
  margin: 1.2rem auto 0;
  max-width: 30em;
  color: var(--ink-dim);
  font-size: 1rem;
  text-wrap: balance;
}

/* ---- section scaffolding ---- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }

section { padding: clamp(2.5rem, 6vw, 4.5rem) 0; }
section + section { border-top: 1px solid var(--line); }

.section-label {
  margin: 0 0 1.8rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--muted);
}

.state {
  color: var(--ink-dim);
  font-size: 1rem;
  padding: 2rem 0;
}

/* ---- hero: spotlit exhibit ---- */
.hero__mount { position: relative; }

.exhibit {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
}
@media (max-width: 760px) {
  .exhibit { grid-template-columns: 1fr; }
}

/* spotlight glow behind the framed work */
.exhibit__frame {
  position: relative;
  isolation: isolate;
  padding: clamp(0.9rem, 2.2vw, 1.6rem);
  background: linear-gradient(160deg, var(--wall-2), var(--frame));
  border: 1px solid var(--line);
  border-radius: 2px;
  box-shadow: 0 30px 60px -28px var(--shadow), 0 2px 0 rgba(255,255,255,0.02) inset;
}
.exhibit__frame::before {
  content: "";
  position: absolute;
  inset: -40% 0 auto 50%;
  translate: -50% 0;
  width: 120%;
  height: 80%;
  background: radial-gradient(60% 60% at 50% 0%, rgba(203,162,76,0.16), transparent 70%);
  z-index: -1;
  pointer-events: none;
}
.exhibit__mat {
  background: var(--frame);
  border: 1px solid var(--line);
  padding: clamp(0.7rem, 2vw, 1.4rem);
}
.exhibit__imgbtn {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  cursor: zoom-in;
}
.exhibit__img {
  display: block;
  width: 100%;
  height: auto;
  background: #000;
}

/* placard — the signature device */
.plate {
  border: 1px solid var(--brass-dim);
  background:
    linear-gradient(180deg, rgba(203,162,76,0.10), rgba(203,162,76,0.02));
  padding: 1.4rem 1.5rem;
  border-radius: 2px;
}
.plate__kicker {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0 0 0.9rem;
}
.plate__soudane {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.6rem, 6vw, 3.6rem);
  line-height: 1;
  color: var(--ink);
}
.plate__soudane span {
  font-family: var(--body);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-dim);
  margin-left: 0.5rem;
  letter-spacing: 0.02em;
}
.plate__rows { margin: 1.3rem 0 0; display: grid; gap: 0.7rem; }
.plate__row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px dotted var(--line);
  padding-top: 0.7rem;
  font-size: 0.92rem;
}
.plate__row dt { color: var(--muted); margin: 0; }
.plate__row dd { margin: 0; font-family: var(--mono); color: var(--ink); }

/* ---- calendar ---- */
.calendar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.calendar__controls {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}
.calendar__nav { display: flex; align-items: center; gap: 0.4rem; }
.randombtn {
  font-family: var(--body);
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--brass-dim);
  background: linear-gradient(180deg, rgba(203, 162, 76, 0.12), rgba(203, 162, 76, 0.03));
  color: var(--ink);
  border-radius: 2px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.randombtn:hover { border-color: var(--brass); color: var(--brass); }
.calendar__month {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.25rem;
  min-width: 8.5ch;
  text-align: center;
}
.navbtn {
  width: 2.4rem; height: 2.4rem;
  border: 1px solid var(--line);
  background: var(--wall-2);
  color: var(--ink);
  font-size: 1.2rem;
  border-radius: 2px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.navbtn:hover:not(:disabled) { border-color: var(--brass); color: var(--brass); }
.navbtn:disabled { opacity: 0.3; cursor: default; }

.calendar__grid {
  margin-top: 1.6rem;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: clamp(2px, 0.4vw, 4px);
}
.cal-dow {
  text-align: center;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  padding-bottom: 0.4rem;
}
.cal-cell {
  position: relative;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--wall-2);
  overflow: hidden;
}
.cal-cell--empty { background: transparent; border-color: transparent; }
.cal-cell--blank { opacity: 0.35; }
.cal-cell__num {
  position: absolute;
  top: 4px; left: 6px;
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--muted);
  z-index: 2;
}
button.cal-cell {
  cursor: pointer;
  padding: 0;
  display: block;
  width: 100%;
}
button.cal-cell .cal-cell__thumb {
  position: absolute;
  inset: 0;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: saturate(0.92);
  transition: transform 0.25s ease, filter 0.25s ease;
}
button.cal-cell:hover .cal-cell__thumb,
button.cal-cell:focus-visible .cal-cell__thumb {
  transform: scale(1.06);
  filter: saturate(1.05) brightness(1.05);
}
button.cal-cell::after {
  content: "";
  position: absolute; inset: 0;
  box-shadow: inset 0 0 0 2px transparent;
  transition: box-shadow 0.2s;
}
button.cal-cell:hover::after,
button.cal-cell:focus-visible::after {
  box-shadow: inset 0 0 0 2px var(--brass);
}

/* ---- archive timeline ---- */
.archive__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: clamp(1rem, 2.5vw, 1.8rem);
}
.card { margin: 0; }
.card__btn {
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--wall-2);
  border-radius: 2px;
  overflow: hidden;
  cursor: zoom-in;
  text-align: left;
  transition: border-color 0.18s, transform 0.18s;
}
.card__btn:hover { border-color: var(--brass-dim); transform: translateY(-3px); }
.card__img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: #000;
}
.card__plate {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.7rem 0.9rem 0.85rem;
}
.card__date { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-dim); }
.card__soudane {
  font-family: var(--display);
  font-weight: 700;
  color: var(--brass);
}
.card__soudane span { font-family: var(--body); font-size: 0.7rem; color: var(--muted); margin-left: 0.2rem; }

/* ---- lightbox ---- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(8, 6, 4, 0.92);
  display: grid;
  place-items: center;
  padding: clamp(1rem, 4vw, 3rem);
  z-index: 40;
}
.lightbox[hidden] { display: none; }
.lightbox__figure {
  margin: 0;
  max-width: min(92vw, 900px);
  max-height: 90vh;
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 1rem;
}
.lightbox__img {
  min-height: 0;
  max-height: 70vh;
  width: auto;
  max-width: 100%;
  justify-self: center;
  object-fit: contain;
  border: 1px solid var(--line);
  background: #000;
}
.plate--lightbox { background: var(--panel); }
.lightbox__close {
  position: absolute;
  top: clamp(0.8rem, 3vw, 1.6rem);
  right: clamp(0.8rem, 3vw, 1.6rem);
  width: 2.8rem; height: 2.8rem;
  border: 1px solid var(--line);
  background: var(--wall-2);
  color: var(--ink);
  font-size: 1.1rem;
  border-radius: 2px;
  cursor: pointer;
}
.lightbox__close:hover { border-color: var(--brass); color: var(--brass); }

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--line);
  background: var(--wall-2);
  color: var(--ink);
  font-size: 1.7rem;
  line-height: 1;
  border-radius: 2px;
  cursor: pointer;
  z-index: 2;
  transition: border-color 0.15s, color 0.15s;
}
.lightbox__nav:not(:disabled):hover { border-color: var(--brass); color: var(--brass); }
.lightbox__nav:disabled { opacity: 0.25; cursor: default; }
.lightbox__nav--prev { left: clamp(0.5rem, 2.5vw, 1.6rem); }
.lightbox__nav--next { right: clamp(0.5rem, 2.5vw, 1.6rem); }

.lightbox__hint {
  display: none;
  position: absolute;
  top: clamp(0.6rem, 2.5vw, 1.3rem);
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  background: rgba(8, 6, 4, 0.55);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  pointer-events: none;
  z-index: 3;
}

/* On phones the side arrows overlap the artwork — hide them and use swipe. */
@media (max-width: 760px) {
  .lightbox__nav { display: none; }
  .lightbox__hint { display: block; }
}

/* ---- colophon ---- */
.colophon {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* hero entrance */
@keyframes riseIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}
.exhibit { animation: riseIn 0.6s ease both; }