/* ============================================================
   あまた音楽堂 特集(TOPICS)ページ専用 (amata_feature.css)
   読み込み: Feature/index.twig / Feature/detail.twig の
   {% block stylesheet %} からのみ。共通CSSには入れない。
   ------------------------------------------------------------
   ■ キャッシュバスターは mtime 自動付与(A-1 / 概要ファイル 3-19)。
     このファイルに版数を書かないこと。FTPで上げ直せばURLが変わる。
   ■ ブレークポイントは 991px / 575px の2段のみ(ルールブック 3-0)。
   ■ 色・余白・動きは :root のデザイントークンを参照し、値を直書きしない。
   ■ 一覧カードの画像比率は 600/250(バナー基準)。詳細のアイキャッチは 1200/630。
     カード側でバナーが無い場合はアイキャッチが入るが、object-fit: cover で
     同じ比率に揃えるためカード高は変わらない(ルールブック 3-A-5)。
   ============================================================ */

.amata-feature {
  max-width: var(--amata-container);
  margin-inline: auto;
  padding-inline: 20px;
}

/* ------------------------------------------------------------
   1. 一覧カード(PC3列 → 991px:2列 → 575px:1列)
   ------------------------------------------------------------ */
.amata-feature-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 24px;
  margin: 0 0 48px;
  padding: 0;
  list-style: none;
}
.amata-feature-card__link {
  display: block;
  color: inherit;
  text-decoration: none;
}
.amata-feature-card__thumb {
  display: block;
  overflow: hidden;
  border-radius: var(--amata-radius);
  box-shadow: var(--amata-shadow-1);
  /* 画像の有無でカード高が変わらないよう比率を固定する */
  aspect-ratio: 600 / 250;
}
.amata-feature-card__thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--amata-dur) var(--amata-ease-out);
}
/* 画像未登録時のプレースホルダ(ブランドグラデーション + 白抜きロゴ)。
   ロゴは装飾のため CSS 背景で置く(スクリーンリーダーには読ませない)。
   実体: html/user_data/assets/img/common/logo_white.png */
.amata-feature-card__thumb--empty {
  display: block;
  width: 100%;
  height: 100%;
  background-image: url('../img/common/logo_white.png'), var(--amata-grad);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 44% auto, cover;
}
.amata-feature-card__link:hover .amata-feature-card__thumb img,
.amata-feature-card__link:focus-visible .amata-feature-card__thumb img {
  transform: scale(1.04);
}
.amata-feature-card__body {
  display: block;
  padding-top: 14px;
}
.amata-feature-card__ttl {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.6;
  transition: color var(--amata-dur-fast) var(--amata-ease-out);
}
.amata-feature-card__link:hover .amata-feature-card__ttl,
.amata-feature-card__link:focus-visible .amata-feature-card__ttl {
  color: var(--amata-teal);
}
.amata-feature-card__lead {
  display: block;
  margin-top: 8px;
  color: var(--amata-ink-soft);
  font-size: 0.9rem;
  line-height: 1.8;
}

.amata-feature__empty {
  padding: 60px 0;
  color: var(--amata-ink-soft);
  text-align: center;
}

/* ------------------------------------------------------------
   2. 詳細
   ------------------------------------------------------------
   コラム詳細(amata_article.css)は全体を 800px に絞っているが、
   特集は商品グリッドを広く見せたいため、
   コンテナ幅は保ったまま「文章だけ」を 800px に絞る方式にする。
   ------------------------------------------------------------ */
.amata-feature__narrow {
  max-width: 800px;
  margin-inline: auto;
}
.amata-feature__narrow--bottom {
  margin-top: 56px;
}

.amata-feature__crumb {
  margin-bottom: 24px;
  color: var(--amata-ink-soft);
  font-size: 0.8rem;
}
.amata-feature__crumb a {
  color: var(--amata-ink-soft);
  text-decoration: none;
}
.amata-feature__crumb a:hover,
.amata-feature__crumb a:focus-visible {
  color: var(--amata-teal);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.amata-feature__crumb span {
  margin-inline: 8px;
}

.amata-feature__head {
  margin-bottom: 32px;
  text-align: center;
}
.amata-feature__date {
  display: block;
  color: var(--amata-ink-soft);
  font-size: 0.85rem;
  font-weight: 700;
  font-feature-settings: 'tnum';
}
.amata-feature__ttl {
  margin: 10px 0 0;
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.5;
}

.amata-feature__eyecatch {
  margin: 0 0 40px;
}
.amata-feature__eyecatch img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--amata-radius);
  box-shadow: var(--amata-shadow-1);
}

.amata-feature__lead {
  margin: 0 0 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--amata-line);
  color: var(--amata-ink-soft);
  font-size: 1rem;
  line-height: 2;
}

.amata-feature__body {
  line-height: 2;
}
.amata-feature__body h2 {
  margin: 48px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--amata-teal);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.5;
}
.amata-feature__body h3 {
  margin: 32px 0 12px;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.6;
}
.amata-feature__body p {
  margin: 0 0 1.5em;
}
.amata-feature__body a {
  color: var(--amata-teal);
}
.amata-feature__body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--amata-radius);
}
.amata-feature__body ul,
.amata-feature__body ol {
  margin: 0 0 1.5em;
  padding-left: 1.5em;
}

/* ------------------------------------------------------------
   3. 対象商品(PC4列 → 991px:3列 → 575px:2列)
   ------------------------------------------------------------
   コラム詳細は3列だが、特集は本文幅に縛られず全幅を使えるため4列にする。
   .amata-work-card はコラム詳細と同名だが、CSSは別ファイルで
   それぞれのページからしか読み込まれないため衝突しない。
   ------------------------------------------------------------ */
.amata-feature__works {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--amata-line);
}
.amata-feature__works-ttl {
  margin: 0 0 24px;
  font-size: 1.15rem;
  font-weight: 700;
  text-align: center;
}
.amata-feature__works .amata-work-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.amata-feature__works .amata-work-card__link {
  display: block;
  color: inherit;
  text-decoration: none;
}
.amata-feature__works .amata-work-card__thumb {
  display: block;
  overflow: hidden;
  border-radius: var(--amata-radius);
  aspect-ratio: 1 / 1;
}
.amata-feature__works .amata-work-card__thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--amata-dur) var(--amata-ease-out);
}
.amata-feature__works .amata-work-card__link:hover .amata-work-card__thumb img,
.amata-feature__works .amata-work-card__link:focus-visible .amata-work-card__thumb img {
  transform: scale(1.04);
}
.amata-feature__works .amata-work-card__body {
  display: block;
  padding-top: 10px;
}
.amata-feature__works .amata-work-card__name {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.6;
}
.amata-feature__works .amata-work-card__price {
  display: block;
  margin-top: 4px;
  color: var(--amata-ink-soft);
  font-size: 0.85rem;
  font-weight: 700;
}
.amata-feature__works .amata-work-card__tax {
  font-size: 0.7rem;
  font-weight: 400;
}

/* ------------------------------------------------------------
   4. 関連コラム(相互リンクの表示側)
   ------------------------------------------------------------ */
.amata-feature__columns {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--amata-line);
}
.amata-feature__columns-ttl {
  margin: 0 0 24px;
  font-size: 1.15rem;
  font-weight: 700;
  text-align: center;
}
.amata-feature-link-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.amata-feature-link-card__link {
  display: block;
  color: inherit;
  text-decoration: none;
}
.amata-feature-link-card__thumb {
  display: block;
  overflow: hidden;
  border-radius: var(--amata-radius);
  box-shadow: var(--amata-shadow-1);
  aspect-ratio: 1200 / 630;
}
.amata-feature-link-card__thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--amata-dur) var(--amata-ease-out);
}
.amata-feature-link-card__thumb--empty {
  display: block;
  width: 100%;
  height: 100%;
  background-image: url('../img/common/logo_white.png'), var(--amata-grad);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 52% auto, cover;
}
.amata-feature-link-card__link:hover .amata-feature-link-card__thumb img,
.amata-feature-link-card__link:focus-visible .amata-feature-link-card__thumb img {
  transform: scale(1.04);
}
.amata-feature-link-card__body {
  display: block;
  padding-top: 10px;
}
.amata-feature-link-card__date {
  display: block;
  color: var(--amata-ink-soft);
  font-size: 0.8rem;
  font-weight: 700;
  font-feature-settings: 'tnum';
}
.amata-feature-link-card__ttl {
  display: block;
  margin-top: 4px;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.6;
  transition: color var(--amata-dur-fast) var(--amata-ease-out);
}
.amata-feature-link-card__link:hover .amata-feature-link-card__ttl,
.amata-feature-link-card__link:focus-visible .amata-feature-link-card__ttl {
  color: var(--amata-teal);
}

.amata-feature__back {
  margin-top: 56px;
  text-align: center;
}
.amata-feature__back a {
  color: var(--amata-teal);
  font-weight: 700;
  text-decoration: none;
}
.amata-feature__back a:hover,
.amata-feature__back a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ------------------------------------------------------------
   5. レスポンシブ
   ------------------------------------------------------------ */
@media (max-width: 991px) {
  .amata-feature {
    padding-inline: 16px;
  }
  .amata-feature-cards {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 16px;
  }
  .amata-feature__ttl {
    font-size: 1.45rem;
  }
  .amata-feature__body h2 {
    margin-top: 40px;
    font-size: 1.15rem;
  }
  .amata-feature__works .amata-work-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 575px) {
  .amata-feature-cards {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .amata-feature__works .amata-work-cards,
  .amata-feature-link-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ------------------------------------------------------------
   6. モーション低減設定への配慮
   ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  .amata-feature-card__thumb img,
  .amata-feature-card__ttl,
  .amata-feature__works .amata-work-card__thumb img,
  .amata-feature-link-card__thumb img,
  .amata-feature-link-card__ttl {
    transition: none;
  }
  .amata-feature-card__link:hover .amata-feature-card__thumb img,
  .amata-feature__works .amata-work-card__link:hover .amata-work-card__thumb img,
  .amata-feature-link-card__link:hover .amata-feature-link-card__thumb img {
    transform: none;
  }
}