/* ==========================================================================
   NPO法人どんぐりの森 TOPページ プロトタイプ
   デザインコンセプト：東北の森に足を踏み入れるようなホームページ
   ========================================================================== */

:root {
  /* カラー：ブナ・ナラの深い緑 / 若葉の柔らかな緑 / 生成りの背景 / 木漏れ日の金色 */
  --color-green-deep: #2e4a3d;
  --color-green-deep-dark: #1f3529;
  --color-green-soft: #6b8f6e;
  --color-bg-natural: #f5f1e8;
  --color-bg-natural-alt: #ede6d8;
  --color-accent-gold: #b98b3e;
  --color-accent-gold-dark: #845e1f;
  --color-text-main: #2b2420;
  --color-text-sub: #5a5148;
  --color-text-on-dark: #f5f1e8;
  --color-border: #d8cfba;

  --font-serif: "Noto Serif JP", serif;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;

  --section-gap-pc: 120px;
  --section-gap-sp: 72px;
  /* お知らせセクション上部専用：PC 96-120px/SP 64-80px程度に収まるよう、
     ブレークポイントで区切らず幅に応じて自然に変化させる */
  --news-gap-top: clamp(64px, 4vw + 48px, 112px);
  --radius-m: 10px;
  --radius-l: 16px;
  --container-w: 1120px;
}

/* --------------------------------------------------------------------------
   基本設定
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg-natural);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  margin: 0;
  line-height: 1.5;
}

p {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-green-deep);
  color: var(--color-text-on-dark);
  padding: 10px 16px;
  z-index: 200;
}

.skip-link:focus {
  left: 8px;
  top: 8px;
}

:focus-visible {
  outline: 3px solid var(--color-accent-gold-dark);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* --------------------------------------------------------------------------
   共通パーツ
   -------------------------------------------------------------------------- */
.section-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-accent-gold-dark);
  margin-bottom: 12px;
}

.section-eyebrow--light {
  color: #e4c98a;
}

.section-title {
  font-size: clamp(1.6rem, 1.2rem + 1.5vw, 2.4rem);
  font-weight: 700;
  color: var(--color-green-deep);
  margin-bottom: 20px;
}

.section-title--light {
  color: var(--color-text-on-dark);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  min-height: 48px;
  border: 2px solid transparent;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background-color: var(--color-green-deep);
  color: var(--color-text-on-dark);
}

.btn--primary:hover {
  background-color: var(--color-green-deep-dark);
}

.btn--accent {
  background-color: var(--color-accent-gold-dark);
  color: var(--color-text-on-dark);
}

.btn--accent:hover {
  background-color: #6f4e19;
}

.btn--outline {
  background-color: transparent;
  border-color: var(--color-green-deep);
  color: var(--color-green-deep);
}

.btn--outline:hover {
  background-color: var(--color-green-deep);
  color: var(--color-text-on-dark);
}

.btn--outline-light {
  background-color: transparent;
  border-color: var(--color-text-on-dark);
  color: var(--color-text-on-dark);
}

.btn--outline-light:hover {
  background-color: var(--color-text-on-dark);
  color: var(--color-green-deep);
}

.btn[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--color-green-deep);
  border-bottom: 1px solid var(--color-green-deep);
  padding-bottom: 2px;
}

.link-arrow::after {
  content: "\2192";
}

.link-arrow--small {
  font-size: 0.85rem;
  margin-top: 12px;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

.badge--future {
  background-color: var(--color-bg-natural-alt);
  color: var(--color-green-deep);
  border: 1px solid var(--color-green-soft);
  margin-bottom: 10px;
}

.badge--dummy {
  background-color: #efe2c2;
  color: #6f4e19;
}

/* --------------------------------------------------------------------------
   01 ヘッダー
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(245, 241, 232, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  min-width: 44px;
  min-height: 44px;
  border-radius: 4px;
}

.site-logo__img {
  display: block;
  height: 64px;
  width: auto;
  aspect-ratio: 264 / 320;
}

.site-logo:focus-visible {
  outline: 3px solid var(--color-accent-gold-dark);
  outline-offset: 3px;
}

@media (min-width: 1280px) {
  .site-logo__img {
    height: 72px;
  }
}

/* デスクトップ用ナビゲーション（常時表示・<details>には依存しない） */
.site-nav-desktop {
  display: none;
}

.site-nav-desktop__list {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: nowrap;
}

.site-nav-desktop__list a {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-main);
  padding: 6px 2px;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.site-nav-desktop__list a:hover,
.site-nav-desktop__list a:focus-visible {
  border-bottom-color: var(--color-accent-gold-dark);
}

.site-nav-desktop__cta {
  flex-shrink: 0;
  padding: 10px 20px;
  min-height: 44px;
  white-space: nowrap;
}

/* モバイル用メニューの開閉トリガー（<details>/<summary>） */
.nav-disclosure {
  display: flex;
  align-items: center;
}

.nav-disclosure summary {
  list-style: none;
}

.nav-disclosure summary::-webkit-details-marker,
.nav-disclosure summary::marker {
  display: none;
  content: "";
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  padding: 8px;
  min-width: 48px;
  min-height: 48px;
}

.nav-toggle__box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
  height: 18px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background-color: var(--color-green-deep);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-disclosure[open] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-disclosure[open] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.nav-disclosure[open] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-toggle__label {
  font-size: 0.65rem;
  color: var(--color-text-sub);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.site-nav__list a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-main);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  border-bottom-color: var(--color-accent-gold-dark);
}

.site-nav__cta {
  flex-shrink: 0;
  padding: 10px 20px;
  min-height: 44px;
}

/* ブレークポイント：デスクトップ用ナビの実測幅に基づき1280pxで切り替える。
   ロゴ＋7項目＋CTAは実測で約1270px未満から横方向にオーバーフローするため、
   900pxでは収まらない。内容を縮小して詰め込まず、実測に基づき調整した。 */
@media (min-width: 1280px) {
  .nav-disclosure {
    display: none;
  }
  .site-nav-desktop {
    display: flex;
    align-items: center;
    gap: 28px;
  }
}

@media (max-width: 1279px) {
  .site-nav-desktop {
    display: none;
  }

  .site-nav {
    /* .site-header に backdrop-filter があるため、position:fixed の包含ブロックが
       ビューポートではなく .site-header になる。inset:0 のまま top:64px 固定値で
       高さを算出すると、右下端が .site-header の下端基準になり数十pxの帯にしか
       ならない。top:100% でヘッダー実高さ分だけ下げて回避する。
       高さは height:100vh だけだとヘッダー分（100%）だけ画面外へ余分にはみ出し、
       短い端末では内部スクロール量が不足してCTAボタンに到達できなくなるため、
       calc(100vh - 100%) でヘッダー高を差し引く。100vhは対応環境が広い保険用の
       フォールバックとして先に書き、100dvhはアドレスバーの表示/非表示で高さが
       変わる実機ブラウザに追従させるための強化として後に書く（未対応環境では無視される）。*/
    position: fixed;
    inset: 0;
    top: 100%;
    bottom: auto;
    height: 100vh;
    height: calc(100vh - 100%);
    height: calc(100dvh - 100%);
    background-color: var(--color-bg-natural);
    padding: 24px 20px 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow-y: auto;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    width: 100%;
  }

  .site-nav__list a {
    display: block;
    width: 100%;
    padding: 14px 4px;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav__cta {
    width: 100%;
    text-align: center;
  }
}

/* --------------------------------------------------------------------------
   02 ファーストビュー
   -------------------------------------------------------------------------- */
.fv {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(640px, 94vh, 820px);
  min-height: clamp(640px, 94svh, 820px);
  color: var(--color-text-on-dark);
  overflow: hidden;
}

.fv__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.fv__image {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center 40%;
}

.fv__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(20, 32, 26, 0.78) 0%,
    rgba(20, 32, 26, 0.42) 42%,
    rgba(20, 32, 26, 0.06) 70%,
    rgba(20, 32, 26, 0) 100%
  );
}

.fv__content {
  position: relative;
  z-index: 1;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px 72px;
  width: 100%;
}

.fv__eyebrow {
  /* 写真の明るい部分と重なっても読めるよう、文字の背後だけに半透明の深緑を敷く */
  display: inline-block;
  padding: 0.35em 0.7em;
  border-radius: 5px;
  background-color: rgba(20, 38, 30, 0.84);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.6;
  margin-bottom: 16px;
  color: #f0d99c;
}

.fv__title {
  font-size: clamp(1.9rem, 1.4rem + 2.6vw, 3.4rem);
  font-weight: 700;
  margin-bottom: 20px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.fv__subtitle {
  font-size: clamp(1rem, 0.9rem + 0.4vw, 1.15rem);
  max-width: 46ch;
  margin-bottom: 32px;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35);
}

.fv__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

@media (max-width: 599px) {
  .fv {
    /* ヘッダー(約89px)を除いた1画面分。小さい端末では最低560pxを確保して縦スクロールを許容 */
    min-height: max(calc(100vh - 90px), 560px);
    min-height: max(calc(100svh - 90px), 560px);
    align-items: flex-end;
    background-color: var(--color-green-deep-dark);
  }
  .fv__content {
    padding: 0 20px 24px;
  }
  .fv__eyebrow {
    margin-bottom: 8px;
  }
  .fv__title {
    font-size: clamp(1.45rem, 7.4vw, 1.9rem);
    margin-bottom: 10px;
  }
  .fv__subtitle {
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 16px;
  }
  .fv__image {
    height: 72%;
    object-position: center 15%;
    -webkit-mask-image: linear-gradient(to bottom, #000 80%, transparent 100%);
    mask-image: linear-gradient(to bottom, #000 80%, transparent 100%);
  }
  .fv__actions {
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 10px;
    width: 100%;
  }
  .fv__actions .btn {
    flex: 1 1 0;
    min-width: 0;
    padding: 12px 4px;
    font-size: 0.8rem;
    white-space: nowrap;
    line-height: 1.4;
    text-align: center;
  }
}

@media (max-width: 359px) {
  .fv__actions {
    flex-direction: column;
  }
}

/* --------------------------------------------------------------------------
   03 私たちが守りたいもの
   -------------------------------------------------------------------------- */
.philosophy {
  padding: var(--section-gap-pc) 24px;
  background-color: var(--color-bg-natural);
}

.philosophy__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: center;
}

.philosophy__image {
  aspect-ratio: 3 / 4;
  object-fit: cover;
  width: 100%;
  border-radius: var(--radius-l);
}

.philosophy__lead {
  font-size: 1.05rem;
  margin-bottom: 20px;
}

.philosophy__body {
  color: var(--color-text-sub);
  margin-bottom: 24px;
}

@media (max-width: 899px) {
  .philosophy {
    padding: var(--section-gap-sp) 20px;
  }
  .philosophy__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .philosophy__image {
    aspect-ratio: 4 / 3;
  }
}

/* 「私たちが守りたいもの」：2カラム全体の下に、コンテンツ幅いっぱいの動物ギャラリー（固定表示・リンクなし） */
.wildlife-gallery {
  max-width: var(--container-w);
  margin: 56px auto 0;
}

.wildlife-gallery__title {
  margin-bottom: 14px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-text-sub);
}

.wildlife-gallery__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.wildlife-gallery__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-m);
}

@media (min-width: 768px) {
  .wildlife-gallery__list { grid-template-columns: repeat(4, 1fr); gap: 12px; }
}

@media (min-width: 1024px) {
  .wildlife-gallery__list { gap: 20px; }
}

@media (max-width: 899px) {
  .wildlife-gallery { margin-top: 40px; }
}

/* --------------------------------------------------------------------------
   05 主な活動
   -------------------------------------------------------------------------- */
.activities {
  padding: var(--section-gap-pc) 24px;
  background-color: var(--color-bg-natural);
}

.activities__header {
  max-width: var(--container-w);
  margin: 0 auto 48px;
  text-align: center;
}

.activities__lead {
  color: var(--color-text-sub);
  max-width: 56ch;
  margin: 0 auto;
  text-wrap: pretty;
  word-break: auto-phrase;
}

/* 紹介文：2つの文を文単位で扱い、幅が十分なときは1文＝1行、狭いときは短い語句単位で折り返す */
.activities__lead-line { display: block; }
.activities__lead .nb { white-space: nowrap; }

@media (min-width: 640px) {
  .activities__lead { max-width: none; }
}

.activities__grid {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.activity-card article {
  background-color: var(--color-bg-natural);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  overflow: hidden;
  height: 100%;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.activity-card:hover article,
.activity-card:focus-within article {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(46, 74, 61, 0.14);
}

.activity-card__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.activity-card__body {
  padding: 20px;
}

.activity-card__title {
  font-size: 1.1rem;
  color: var(--color-green-deep);
  margin-bottom: 10px;
}

.activity-card__text {
  font-size: 0.92rem;
  color: var(--color-text-sub);
}

@media (max-width: 899px) {
  .activities {
    padding: var(--section-gap-sp) 20px;
  }
  .activities__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 599px) {
  .activities__grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   06 山林を未来へつなぎませんか
   -------------------------------------------------------------------------- */
.forest-donation {
  padding: var(--section-gap-pc) 24px;
  background-color: var(--color-green-deep);
  color: var(--color-text-on-dark);
}

.forest-donation__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}

.forest-donation__body {
  font-size: 1.05rem;
  margin-bottom: 20px;
  opacity: 0.95;
}

.forest-donation__note {
  font-size: 0.85rem;
  opacity: 0.8;
  margin-bottom: 32px;
  line-height: 1.9;
}

.forest-donation__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.forest-donation__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-l);
}

@media (max-width: 899px) {
  .forest-donation {
    padding: var(--section-gap-sp) 20px;
  }
  .forest-donation__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .forest-donation__actions {
    flex-direction: column;
  }
  .forest-donation__actions .btn {
    width: 100%;
  }
}

/* --------------------------------------------------------------------------
   04 お知らせ
   -------------------------------------------------------------------------- */
.news {
  padding: var(--section-gap-pc) 24px;
  padding-top: var(--news-gap-top);
  background-color: var(--color-bg-natural-alt);
}

.news__header {
  max-width: var(--container-w);
  margin: 0 auto 32px;
  text-align: center;
}

.news__disclaimer {
  max-width: var(--container-w);
  margin: 0 auto 32px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-sub);
  background-color: var(--color-bg-natural);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-m);
  padding: 10px 16px;
}

.news__grid {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.news-card article {
  background-color: #fff;
  border-radius: var(--radius-l);
  overflow: hidden;
  height: 100%;
  border: 1px solid var(--color-border);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.news-card:hover article,
.news-card:focus-within article {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(46, 74, 61, 0.14);
}

.news-card__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.news-card__body {
  padding: 20px;
}

.news-card__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.78rem;
  color: var(--color-text-sub);
  margin-bottom: 12px;
}

.news-card__title {
  font-size: 1.02rem;
  color: var(--color-green-deep);
  margin-bottom: 10px;
  font-family: var(--font-sans);
  font-weight: 700;
}

.news-card__excerpt {
  font-size: 0.88rem;
  color: var(--color-text-sub);
}

.news__footer {
  text-align: center;
  margin-top: 40px;
}

@media (max-width: 899px) {
  .news {
    padding-right: 20px;
    padding-bottom: var(--section-gap-sp);
    padding-left: 20px;
    /* padding-top は --news-gap-top（clamp）でこの幅でも自然に変化するため、
       ここでは上書きしない */
  }
  .news__grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* --------------------------------------------------------------------------
   07 YouTube
   -------------------------------------------------------------------------- */
.youtube {
  padding: var(--section-gap-pc) 24px;
  background-color: var(--color-bg-natural-alt);
}

.youtube__header {
  max-width: var(--container-w);
  margin: 0 auto;
  text-align: center;
  margin-bottom: 40px;
}

.youtube__player {
  position: relative;
  max-width: var(--container-w);
  margin: 0 auto;
  border-radius: var(--radius-l);
  overflow: hidden;
  background-color: #000;
}

.youtube__thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.youtube__play {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: transparent;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.youtube__play-icon {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background-color: rgba(245, 241, 232, 0.92);
  color: var(--color-green-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  transition: transform 0.2s ease;
}

.youtube__play:hover .youtube__play-icon,
.youtube__play:focus-visible .youtube__play-icon {
  transform: scale(1.08);
}

.youtube__note {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 16px;
  text-align: center;
  color: var(--color-text-on-dark);
  font-size: 0.85rem;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
}

.youtube__player iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  display: block;
}

@media (max-width: 899px) {
  .youtube {
    padding: var(--section-gap-sp) 20px;
  }
}

/* --------------------------------------------------------------------------
   08 Instagram
   -------------------------------------------------------------------------- */
.instagram {
  padding: var(--section-gap-pc) 24px;
  background-color: var(--color-bg-natural);
}

.instagram__header {
  max-width: var(--container-w);
  margin: 0 auto;
  text-align: center;
  margin-bottom: 40px;
}

.instagram__grid {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.instagram-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-m);
}

.instagram__footer {
  max-width: var(--container-w);
  margin: 32px auto 0;
  text-align: center;
}

.instagram__fallback {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--color-text-sub);
}

@media (max-width: 899px) {
  .instagram {
    padding: var(--section-gap-sp) 20px;
  }
  .instagram__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --------------------------------------------------------------------------
   09 参加・支援の案内
   -------------------------------------------------------------------------- */
.support {
  padding: var(--section-gap-pc) 24px;
  background-color: var(--color-bg-natural-alt);
}

.support__header {
  max-width: var(--container-w);
  margin: 0 auto;
  text-align: center;
  margin-bottom: 48px;
}

.support__grid {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.support-card article {
  background-color: var(--color-bg-natural);
  border-radius: var(--radius-l);
  padding: 32px 24px;
  text-align: center;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--color-border);
}

.support-card__title {
  font-size: 1.15rem;
  color: var(--color-green-deep);
}

.support-card__text {
  color: var(--color-text-sub);
  font-size: 0.92rem;
}

.support__note {
  max-width: var(--container-w);
  margin: 32px auto 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-sub);
}

@media (max-width: 899px) {
  .support {
    padding: var(--section-gap-sp) 20px;
  }
  .support__grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* --------------------------------------------------------------------------
   10 最後のメッセージ
   -------------------------------------------------------------------------- */
.closing {
  position: relative;
  min-height: min(70vh, 640px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-on-dark);
  overflow: hidden;
}

.closing__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.closing__image {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.closing__scrim {
  position: absolute;
  inset: 0;
  background-color: rgba(20, 32, 26, 0.42);
}

.closing__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 24px;
}

.closing__message {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 1.2rem + 1.6vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 32px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

@media (max-width: 599px) {
  .closing__actions {
    flex-direction: column;
  }
  .closing__actions .btn {
    width: 100%;
  }
}

/* --------------------------------------------------------------------------
   11 フッター
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-green-deep-dark);
  color: var(--color-text-on-dark);
  padding: 64px 24px 24px;
}

.site-footer__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(245, 241, 232, 0.15);
}

.site-footer__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.site-footer__meta {
  font-size: 0.85rem;
  opacity: 0.8;
  margin-bottom: 8px;
  line-height: 1.7;
}

.site-footer__nav ul,
.site-footer__links ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.site-footer__nav a,
.site-footer__links a {
  font-size: 0.88rem;
  opacity: 0.85;
}

.site-footer__nav a:hover,
.site-footer__links a:hover {
  opacity: 1;
  text-decoration: underline;
}

.site-footer__links-title {
  font-size: 0.8rem;
  opacity: 0.7;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.site-footer__bottom {
  max-width: var(--container-w);
  margin: 0 auto;
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.8rem;
  opacity: 0.75;
}

.site-footer__legal {
  display: flex;
  gap: 20px;
}

@media (max-width: 899px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (min-width: 600px) and (max-width: 899px) {
  .fv {
    align-items: flex-end;
    background-color: var(--color-green-deep-dark);
  }
  .fv__image {
    height: 72%;
    object-position: center top;
    -webkit-mask-image: linear-gradient(to bottom, #000 80%, transparent 100%);
    mask-image: linear-gradient(to bottom, #000 80%, transparent 100%);
  }
}

@media (min-width: 900px) {
  .fv__content {
    padding-bottom: 56px;
  }
  .fv__subtitle {
    margin-bottom: 24px;
  }
}

@media (min-width: 1280px) {
  .fv {
    min-height: clamp(740px, 94vh, 820px);
    min-height: clamp(740px, 94svh, 820px);
  }
}

/* 1024〜1279px：コピーと看板下の板の間に24px以上の余白を確保 */
@media (min-width: 900px) and (max-width: 1279px) {
  .fv {
    min-height: max(calc(100vh - 89px), 600px);
    min-height: max(calc(100svh - 89px), 600px);
  }
  .fv__content {
    padding-bottom: 28px;
  }
  .fv__title {
    /* 看板左の支柱（画面幅の約43%）に届かない大きさ。支柱との間に24px以上を確保 */
    font-size: calc(3.75vw - 4px);
    margin-bottom: 14px;
  }
  .fv__subtitle {
    max-width: calc(43vw - 72px);
    margin-bottom: 18px;
  }
}

/* 1100〜1279px：コンテナが中央寄せになり文字の左位置が右へずれるため、支柱までの幅から文字サイズを再計算 */
@media (min-width: 1100px) and (max-width: 1279px) {
  .fv__title {
    font-size: calc((488px - 7vw) / 11);
  }
  .fv__subtitle {
    max-width: calc(488px - 7vw);
  }
}


/* 外部リンク（新しいタブで開く）の表示：視覚＝記号、読み上げ＝補足文 */
.ext-mark { margin-left: 0.3em; font-size: 0.9em; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Selected Instagram posts: equal cards in the requested order. */
.instagram__posts {
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  align-items: stretch;
}
.instagram-post {
  min-width: 0;
  height: 620px;
  overflow-y: scroll;
  scrollbar-gutter: stable;
  contain: inline-size;
  overflow-x: hidden;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
}
.instagram-post .instagram-media {
  box-sizing: border-box;
  width: 100% !important;
  min-width: 0 !important;
  max-width: 100% !important;
  margin: 0 !important;
  display: block;
}
.instagram-post blockquote { padding: 16px; }
.instagram-post iframe.instagram-media { padding: 0; border: 0; }
@media (max-width: 1199px) {
  .instagram__posts { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 880px; gap: 24px; }
}
@media (max-width: 767px) {
  .instagram__posts {
    grid-template-columns: minmax(0, 1fr);
    max-width: 420px;
    gap: 20px;
  }
  .instagram-post { height: 580px; }
}