/* ================================================
   installation.css
   gallery.htmlの雰囲気をベースにした格式あるアート展スタイル
   style.css・responsive.cssの後に読み込んでください
   ================================================ */

/* ===== ページ全体 ===== */
body {
  background: #060708;
  color: #e8e0cc;
}

/* ===== ページヘッダー ===== */
.is-header {
  padding: 100px 20px 56px;
  text-align: center;
  background: #080a0d;
  border-bottom: 1px solid rgba(111, 159, 166, 0.12);
}

.is-header__inner {
  position: relative;
  display: inline-block;
}

.is-header__label {
  font-family: "Space Mono", monospace;
  font-size: 8px;
  letter-spacing: 0.4em;
  color: rgba(111, 159, 166, 0.6);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.is-header__title {
  font-family: "Zen Old Mincho", serif;
  font-size: 36px;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: #e8e0cc;
  margin-bottom: 10px;
  /* わずかなにじみ：gallery.htmlに近い表現 */
  text-shadow:
    0 0 12px rgba(255, 255, 255, 0.08),
    1px 0 0 rgba(111, 159, 166, 0.06),
    -1px 0 0 rgba(111, 159, 166, 0.04);
}

.is-header__title-ja {
  font-size: 11px;
  letter-spacing: 0.45em;
  color: rgba(111, 159, 166, 0.65);
}

/* ヘッダー下の縦線 */
.is-header__line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(111, 159, 166, 0.5), transparent);
  margin: 28px auto 0;
}

/* ===== メインエリア ===== */
.is-main {
  background: #080a0d;
}

/* ===== セクション共通 ===== */
.is-section {
  padding: 64px 0;
}

.is-section__wrap {
  width: 353px;
  margin: 0 auto;
}

/* ===== 2カラムレイアウト（SP：縦積み） ===== */
.is-section__inner {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

/* ===== メディアエリア（画像・動画共通） ===== */
.is-media {
  width: 100%;
  flex-shrink: 0;
}

.is-media__frame {
  position: relative;
  overflow: hidden;
  background: #040506;
  /* gallery.htmlと同じ角丸感 */
  border-radius: 2px;
}

/* 静止画 */
.is-media__img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  /* gallery.htmlと同様の彩度・コントラスト調整 */
  filter: saturate(0.75) brightness(0.88) contrast(1.08);
  transition: filter 0.6s ease, transform 0.6s ease;
}

.is-media__frame:hover .is-media__img {
  filter: saturate(0.9) brightness(0.96) contrast(1.04);
  transform: scale(1.02);
}

/* 動画 */
.is-media__frame--video {
  aspect-ratio: 4 / 3;
}

.is-media__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.85) contrast(1.1);
}

/* コーナー装飾（gallery.htmlのコーナーと同系統） */
.is-corner {
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
  z-index: 2;
}

.is-corner--tl {
  top: -1px;
  left: -1px;
  border-top: 1px solid rgba(111, 159, 166, 0.7);
  border-left: 1px solid rgba(111, 159, 166, 0.7);
}

.is-corner--br {
  bottom: -1px;
  right: -1px;
  border-bottom: 1px solid rgba(111, 159, 166, 0.7);
  border-right: 1px solid rgba(111, 159, 166, 0.7);
}

/* PHOTO / VIDEO バッジ */
.is-media__badge {
  position: absolute;
  bottom: 8px;
  left: 10px;
  font-family: "Space Mono", monospace;
  font-size: 7px;
  letter-spacing: 0.18em;
  color: rgba(180, 220, 200, 0.65);
  text-shadow: 0 0 4px rgba(0,0,0,0.8);
  z-index: 3;
  pointer-events: none;
}

.is-media__badge--video {
  color: rgba(180, 160, 200, 0.7);
  animation: videoBadgeBlink 2s steps(1) infinite;
}

@keyframes videoBadgeBlink {
  0%, 60%  { opacity: 1; }
  61%, 100% { opacity: 0.3; }
}

/* 作品番号 */
.is-media__num {
  font-family: "Space Mono", monospace;
  font-size: 8px;
  letter-spacing: 0.28em;
  color: rgba(111, 159, 166, 0.4);
  margin-top: 10px;
  text-align: right;
}

/* ===== テキストエリア ===== */
.is-text {
  width: 100%;
}

.is-text__inner {
  padding: 0 2px;
}

/* カテゴリ */
.is-text__category {
  font-family: "Space Mono", monospace;
  font-size: 8px;
  letter-spacing: 0.32em;
  color: rgba(111, 159, 166, 0.6);
  text-transform: uppercase;
  margin-bottom: 18px;
}

/* タイトル */
.is-text__title {
  font-family: "Zen Old Mincho", serif;
  font-size: 26px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: #e8e0cc;
  line-height: 1.35;
  margin-bottom: 10px;
  /* 微妙なにじみ */
  text-shadow: 0 0 8px rgba(255,255,255,0.06);
}

/* 日本語サブタイトル */
.is-text__sub {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(111, 159, 166, 0.55);
  margin-bottom: 22px;
}

/* 区切り線 */
.is-text__rule {
  border: none;
  border-top: 1px solid rgba(111, 159, 166, 0.2);
  margin: 0 0 22px;
  width: 40px;
}

/* 説明文 */
.is-text__desc {
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.06em;
  line-height: 2.1;
  color: rgba(232, 224, 204, 0.55);
  margin-bottom: 26px;
}

/* メタ情報 */
.is-text__meta {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid rgba(111, 159, 166, 0.1);
  padding-top: 22px;
}

.is-text__meta li {
  font-family: "Space Mono", monospace;
  font-size: 8px;
  letter-spacing: 0.1em;
  color: rgba(232, 224, 204, 0.35);
  display: flex;
  gap: 14px;
  line-height: 1.7;
}

.is-text__meta-key {
  color: rgba(111, 159, 166, 0.6);
  min-width: 28px;
  flex-shrink: 0;
}

/* ===== セクション間の区切り ===== */
.is-separator {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 353px;
  margin: 0 auto;
  padding: 0 4px;
}

.is-separator span {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(111, 159, 166, 0.15), transparent);
}

.is-separator__dot {
  flex: none;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(111, 159, 166, 0.3);
}



/* ===== フッター ===== */
.is-footer {
  background: #080a0d;
  padding: 60px 20px 48px;
  text-align: center;
  border-top: 1px solid rgba(111, 159, 166, 0.1);
}

.is-back-top {
  display: inline-block;
  padding: 10px 32px;
  font-family: "Space Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: rgba(111, 159, 166, 0.7);
  text-decoration: none;
  text-transform: uppercase;
  border: 1px solid rgba(111, 159, 166, 0.3);
  outline: 1px solid rgba(111, 159, 166, 0.15);
  outline-offset: 4px;
  position: relative;
  overflow: hidden;
  transition: color 0.4s ease, border-color 0.4s ease;
  margin-bottom: 28px;
}

.is-back-top::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(111, 159, 166, 0.12);
  transform: translateY(100%);
  transition: transform 0.4s ease;
  z-index: 0;
}

.is-back-top:hover::before { transform: translateY(0); }
.is-back-top:hover {
  color: #e8e0cc;
  border-color: rgba(111, 159, 166, 0.6);
}

.is-back-top span {
  position: relative;
  z-index: 1;
}

.is-footer__copy {
  font-family: "Space Mono", monospace;
  font-size: 8px;
  letter-spacing: 0.1em;
  color: rgba(111, 159, 166, 0.25);
  margin-top: 14px;
}

/* ===== タブレット（768px〜）: 2カラム化 ===== */
@media (min-width: 768px) {

  .is-header__title {
    font-size: 44px;
  }

  .is-section {
    padding: 80px 0;
  }

  .is-section__wrap {
    width: 700px;
  }

  /* 横並び */
  .is-section__inner {
    flex-direction: row;
    align-items: center;
    gap: 44px;
  }

  /* 逆順（展示02） */
  .is-section--reverse .is-section__inner {
    flex-direction: row-reverse;
  }

  .is-media {
    width: 46%;
  }

  .is-text {
    width: 54%;
  }

  .is-text__title {
    font-size: 26px;
  }

  .is-text__desc {
    font-size: 12px;
  }

  .is-separator {
    width: 700px;
  }
}

/* ===== PC（1024px〜） ===== */
@media (min-width: 1024px) {

  .is-header {
    padding: 120px 20px 70px;
  }

  .is-header__title {
    font-size: 52px;
  }

  .is-section {
    padding: 100px 0;
  }

  .is-section__wrap {
    width: 900px;
  }

  .is-section__inner {
    gap: 64px;
  }

  .is-media {
    width: 48%;
  }

  .is-text {
    width: 52%;
  }

  .is-text__title {
    font-size: 32px;
  }

  .is-text__desc {
    font-size: 13px;
    line-height: 2.2;
  }

  .is-text__meta li {
    font-size: 9px;
  }

  .is-separator {
    width: 900px;
  }
}

/* ===== ワイドPC（1280px〜） ===== */
@media (min-width: 1280px) {

  .is-section__wrap {
    width: 1060px;
  }

  .is-section__inner {
    gap: 80px;
  }

  .is-separator {
    width: 1060px;
  }

  .is-text__title {
    font-size: 38px;
  }
}