/* ==========================================================================
   Museum — ギャラリー画面のスタイル
   tokens.css / base.css で定義済みの変数・基本レイアウトを土台として、
   展示物カードとビューア（拡大表示）まわりだけをここで追加する。
   ========================================================================== */

/* main の横幅を、ギャラリーのグリッドが映えるように少し広げる */
main {
  max-width: 1080px;
}

/* --- フィルターナビ（すべて / 画像 / 音楽 / 動画） --- */
.site-header__nav a {
  cursor: pointer;
}

.site-header__nav a.is-active {
  color: var(--color-matcha);
  position: relative;
}

.site-header__nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.4rem;
  height: 2px;
  background: var(--color-matcha);
  border-radius: 2px;
}

/* --- 展示物グリッド --- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
}

/* --- 展示物カード（プラーク＝美術館の解説プレートを模した見た目） --- */
.exhibit-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  padding: 0;
  cursor: pointer;
  font: inherit;
  color: inherit;
  text-align: left;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.exhibit-card:hover,
.exhibit-card:focus-visible {
  border-color: var(--color-matcha);
  transform: translateY(-2px);
  outline: none;
}

.exhibit-card:focus-visible {
  outline: 2px solid var(--color-matcha);
  outline-offset: 2px;
}

.exhibit-card__thumb {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--color-surface-2);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.exhibit-card__thumb img,
.exhibit-card__thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.exhibit-card__thumb--audio {
  background: linear-gradient(
    160deg,
    var(--color-surface-2),
    var(--color-surface)
  );
}

.exhibit-card__icon {
  display: flex;
  color: var(--color-matcha);
  opacity: 0.85;
  pointer-events: none;
}

/* 動画サムネイルの再生アイコンは中央に重ねる */
.exhibit-card__thumb video + .exhibit-card__icon {
  position: absolute;
}

.exhibit-card__plaque {
  padding: 0.9rem 1rem;
  border-top: 1px solid var(--color-line);
}

.exhibit-card__title {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exhibit-card__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

/* --- ビューア（拡大表示モーダル） --- */
.viewer {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.viewer__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 12, 0.85);
  backdrop-filter: blur(4px);
}

.viewer__frame {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  max-width: min(90vw, 900px);
  max-height: 90vh;
  background: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}

.viewer__close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  color: var(--color-text);
  cursor: pointer;
}

.viewer__close:hover,
.viewer__close:focus-visible {
  background: var(--color-matcha);
  color: var(--color-bg);
  outline: none;
}

.viewer__media {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  min-height: 0;
}

.viewer__media img,
.viewer__media video {
  display: block;
  max-width: 100%;
  max-height: 70vh;
}

.viewer__media audio {
  width: min(80vw, 480px);
  margin: 3rem;
}

.viewer__plaque {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--color-line);
}

.viewer__plaque-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.viewer__title {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
}

.viewer__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-matcha);
}

.viewer__copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--color-surface-2);
  border: 1px solid var(--color-line);
  color: var(--color-text-muted);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--font-body);
  white-space: nowrap;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.viewer__copy-btn:hover {
  border-color: var(--color-matcha);
  color: var(--color-matcha);
}

.viewer__copy-btn.is-copied {
  border-color: var(--color-matcha);
  background-color: rgba(122, 184, 122, 0.15);
  color: var(--color-matcha);
}

/* --- トースト通知 --- */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  z-index: 200;
}

.toast {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-left: 4px solid var(--color-matcha);
  color: var(--color-text);
  padding: 0.75rem 1.1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  box-shadow: 0 10px 30px -6px rgba(0, 0, 0, 0.6);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  min-width: 200px;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- 動きを抑えたい場合は装飾トランジションを無効化 --- */
@media (prefers-reduced-motion: reduce) {
  .exhibit-card {
    transition: none;
  }
}

/* --- モバイル --- */
@media (max-width: 640px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .site-header__nav a {
    margin-left: 0;
    margin-right: 1.25rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
  }

  .viewer {
    padding: 1rem;
  }
}