/* ================================
   Base
================================ */

:root {
  --bg-light-level: 1;
  --bg-shift: 0px;
  --fg-max-width: 1080px;
  --fg-padding-x: 16px;
  --fg-card-radius: 18px;
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Yu Gothic",
    "Hiragino Sans", sans-serif;
  color: #f7f3ea;
  background: radial-gradient(circle at top, #202630 0, #070a0f 55%, #050609 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ================================
   背景の奥の森レイヤー (3)
================================ */

.forest-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;

  background-repeat: no-repeat;

  /* 横を常に画面いっぱいにする */
  background-size: 100% auto;  
  background-position: center 100%;  /* 下からスタート */

  opacity: 0.42;
  mix-blend-mode: normal;
  transition: background-image 1.2s ease-out;
}



/* 背景をゆっくり上送りする */
@keyframes forestScrollUp {
  0% {
    background-position: center 100%;  /* 画像の下側を表示 */
  }
  100% {
    background-position: center 0%;    /* 画像の上側までゆっくり送る */
  }
}



/* ================================
   Layout
================================ */

.fg-wrapper {
  position: relative;
  z-index: 1;
  max-width: var(--fg-max-width);
  margin: 0 auto;
  padding: 32px var(--fg-padding-x) 64px;
}

.fg-section {
  padding: 40px 0;
}

/* 入口セクション */
.fg-intro {
  padding-top: 80px;
  padding-bottom: 80px;
}

.fg-intro-inner {
  max-width: 640px;
}

.fg-title {
  font-size: clamp(2.2rem, 4vw, 2.8rem);
  margin: 0 0 16px;
  letter-spacing: 0.08em;
}

.fg-lead {
  font-size: 18px;
  line-height: 1.8;
  margin: 0 0 8px;
}

.fg-lead-sub {
  font-size: 0.9rem;
  opacity: 0.8;
  margin: 0;
}

/* セクションの見出し */
.fg-section-title {
  font-size: 1.4rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 24px;
  position: relative;
}

.fg-section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 72px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #ffc973, #fff3c7);
}

/* ================================
   ギャラリーグリッド
================================ */

.fg-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  row-gap: 60px;        /* 上下の隙間：ここを増やす */
  column-gap: 24px;     /* 左右は現状維持 */
}


/* 2. カードホバーで光がにじむ */
.fg-card {
  display: block;
  position: relative;
  border-radius: var(--fg-card-radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;

  /* 背景の森がうっすら透けるように */
  background: rgba(7, 10, 16, 0.75);
  backdrop-filter: blur(4px);

  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.58);
  transform: translateY(0);
  transition:
    transform 0.4s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  cursor: zoom-in;
}


.fg-figure {
  margin: 0;
  position: relative;
}

.fg-card img {
  display: block;
  width: 100%;
  height: auto;
  transform: scale(1.02);
  transform-origin: center;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

/* 光の縁取り */
.fg-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle at top, rgba(255, 237, 188, 0.45), transparent 65%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease-out;
}

.fg-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 0 26px rgba(255, 220, 150, 0.36);
}

.fg-card:hover::before {
  opacity: 1;
}

.fg-card:hover img {
  transform: scale(1.06);
}

.fg-caption {
  padding: 12px 16px 14px;
  font-size: 0.9rem;
  line-height: 1.7;
  background: linear-gradient(to bottom, rgba(4, 7, 12, 0), rgba(4, 7, 12, 0.88));
}

/* ================================
   Lore section
================================ */

.fg-lore {
  max-width: 720px;
}

.fg-text {
  font-size: 0.95rem;
  line-height: 1.9;
  margin: 0 0 12px;
  opacity: 0.9;
}

/* ================================
   Responsiveness
================================ */

@media (max-width: 640px) {
  .fg-wrapper {
    padding-top: 24px;
  }
  .fg-intro {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}
/* ================================
   Lightbox
================================ */

.fg-lightbox {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: none;
  align-items: center;
  justify-content: center;

  /* 完全な真っ黒じゃなく、森の背景が透けて見える */
  background: rgba(3, 5, 10, 0.72);
}

.fg-lightbox.is-open {
  display: flex;
}

.fg-lightbox-inner {
  position: relative;
  max-width: min(80vw, 720px);
  width: 100%;
  padding: 16px 20px 18px;
  border-radius: 22px;

  /* ここも少し透け＋ぼかしで“ガラスケース”感 */
  background: rgba(6, 9, 14, 0.8);
  backdrop-filter: blur(8px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.9);
}

.fg-lightbox-close {
  position: absolute;
  top: 10px;
  right: 14px;
  border: none;
  background: transparent;
  color: #f5f3ea;
  font-size: 1.2rem;
  cursor: pointer;
}

.fg-lightbox-figure {
  margin: 0;
}

#fg-lightbox-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
}

#fg-lightbox-caption {
  margin-top: 10px;
  font-size: 0.9rem;
  line-height: 1.7;
  opacity: 0.9;
}
@media (max-width: 640px) {
  .fg-wrapper {
    padding-top: 24px;
  }

  .fg-intro {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  /* ▼ スマホではカード2列固定 ▼ */
  .fg-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 32px;      /* スマホ用の上下ギャップ */
    column-gap: 16px;   /* スマホ用の左右ギャップ */
  }
}
.fg-gallery-head {
  position: relative;      /* ★ ここを追加 */
  margin-bottom: 24px;
  /* display:flex; は一旦外してOK（下でスマホ用に指定） */
}
/* PC向け配置（768px以上） */
 .bgm-toggle {
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid rgba(255, 247, 220, 0.4);
    background: rgba(8, 12, 18, 0.72);
    color: #f7f3e8;
    font-size: 14px;
    backdrop-filter: blur(6px);
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.7);
    cursor: pointer;
    transition: background 0.25s ease, transform 0.25s ease;
 }
@media (min-width: 768px) {
  .bgm-toggle {
    position: absolute;
    top: 3px;      /* 見出しの少し上あたり */
    left: 950px;    /* ★ 赤丸の横位置。好みで 240〜300 くらい調整してOK */

  }

  .bgm-toggle.is-on {
    background: rgba(255, 214, 140, 0.9);
    color: #2b200b;
    border-color: rgba(255, 235, 200, 0.8);
  }
}
/* スマホでは素直にタイトル横／右寄せに並べる */
@media (max-width: 767px) {
  .fg-gallery-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .bgm-toggle {
    position: static;
    font-size: 0.75rem;
    padding: 5px 10px;
  }
}