@charset "utf-8";

/* =========================================================
   index-features.css
   役割：
   - index の「機能紹介」専用スタイル
   - ポートフォリオ注記
   - Featureカード一覧
   - flipカード演出
   - モーダル表示
   - 学習用コメント付きで保守しやすく整理
   ========================================================= */

@import url(../components.css);


/* =========================================================
   1) ポートフォリオ注記
   ========================================================= */
.portfolio-note{
  margin-top: 16px;
  padding: 14px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: rgb(255, 206, 206);
}

.portfolio-note h3{
  margin: 0 0 8px;
  color: #0f172a;
  font-size: 15px;
  font-weight: 900;
}

.portfolio-note p{
  margin: 0;
  color: #334155;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.7;
}

.portfolio-note .small{
  margin-top: 8px;
  color: #64748b;
  font-size: 13px;
  font-weight: 700;
}

.portfolio-links{
  margin-top: 10px;
}

.portfolio-links a{
  color: #0f172a;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 3px;
}


/* =========================================================
   2) Feature一覧レイアウト
   ========================================================= */
   .features{
     width: min(1200px, calc(100% - 32px));
     margin: 16px auto 0;
     padding: 14px;
     background-color: #cbd5e1;
     border: 1px solid rgb(0, 0, 0);
     border-radius: 12px;
   }

   .features h2{
     margin: 0 0 0 14px;	
	 color: #000; 
   }

   .features p{
	 color: #0f172a;
     margin: 0 0 0 14px;
	 font-size: 18px;
      }
   
.feature-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 14px 14px 14px 14px;
}


/* =========================================================
   3) Featureカード基本
   学習用メモ：
   - .feature-card は外枠
   - button 要素にしてモーダル起動のクリック対象にしている
   - flip演出の実体は inner 側で回す
   ========================================================= */
.feature-card{
  position: relative;
  overflow: hidden;
  min-height: 220px;
  border: 1px solid rgb(0, 0, 0);
  border-radius: 12px;
  background: #ffffff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.05);
}

.feature-card--modal{
  display: block;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 2px solid rgb(0, 0, 0);
  background: #ffffff;
  color: inherit;
  font: inherit;
  line-height: inherit;
  text-align: left;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: transform .25s ease, box-shadow .25s ease;
}

.feature-card--modal:hover{
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.10);
}

.feature-card--modal:focus-visible{
  outline: 3px solid rgba(59, 130, 246, 0.35);
  outline-offset: 2px;
}


/* =========================================================
   4) flipカード土台
   学習用メモ：
   - perspective は立体感の土台
   - 実際に回転するのは .feature-card__flip-inner
   - hover / focus-within で inner を rotateY(180deg) する
   ========================================================= */
.feature-card--flip{
  min-height: 220px;
  perspective: 1200px;
  -webkit-perspective: 1200px;
}

/* 学習用メモ：
   flip中に表裏がはみ出しても不自然になりにくいように visible */
.feature-card--flip.feature-card--modal{
  overflow: visible;
}

.feature-card__flip-inner{
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform .65s cubic-bezier(.5,.3,.3,1);
}

/* 学習用メモ：
   - hover で反転
   - focus-within にしておくとキーボード操作時も安定しやすい */
.feature-card--flip:hover .feature-card__flip-inner,
.feature-card--flip:focus-within .feature-card__flip-inner{
  transform: rotateY(180deg);
}


/* =========================================================
   5) 表面・裏面 共通
   学習用メモ：
   - front / back は同じ位置に absolute で重ねる
   - backface-visibility で裏写りを防ぐ
   ========================================================= */
.feature-card__face{
  position: absolute;
  inset: 0;
  display: block;
  overflow: hidden;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #ffffff;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.feature-card__face--front{
  transform: rotateY(0deg);
  background: #e9eef5;
}

.feature-card__face--back{
  transform: rotateY(180deg);
}

/* 背景画像 */
.feature-card__bg{
  position: absolute;
  inset: 0;
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
}

/* 初期値：
   front はやや見せる
   ※ clear / soft / covered クラスであとから上書き可能 */
.feature-card__face--front .feature-card__bg{
  opacity: 0.56;
}

/* 裏面は説明の可読性優先 */
.feature-card__bg--back{
  opacity: 0.38;
}

.feature-card__overlay{
  position: absolute;
  inset: 0;
}

/* front 初期オーバーレイはかなり薄め */
.feature-card__face--front .feature-card__overlay{
  background: rgba(241, 245, 249, 0.08);
}

/* 裏面は読みやすさ優先で濃いめ */
.feature-card__overlay--back{
  background: rgba(15, 23, 42, 0.52);
}

.feature-card__body{
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 12px;
  min-height: 220px;
  padding: 18px 16px;
}

.feature-card__head{
  display: flex;
  align-items: center;
  gap: 10px;
}

.feature-num{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: #111827;
  color: #ffffff;
  font-size: 13px;
  font-weight: 800;
}

.feature-card h3{
  margin: 0;
  color: #0f172a;
  font-size: 16px;
  font-weight: 900;
  line-height: 1.4;
}

.feature-card p{
  margin: 0;
  color: #334155;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.7;
}


/* =========================================================
   6) 表面（背景 + バッジ + 項目名）
   学習用メモ：
   - 表面は画像の上に「番号 + タイトル」を載せる
   - 半透明の下敷きで可読性を確保
   - 表面デザインは現状維持
   ========================================================= */
.feature-card__body--front{
  align-items: flex-start;
  justify-content: flex-end;
  padding: 18px 16px;
}

.feature-card__body--front::before{
  display: none;
}

.feature-card__head--front{
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 14px;
}

/* バッジ + 項目名の後ろに薄い下敷き */
.feature-card__head--front::before{
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: 14px;
  background: rgba(248, 250, 252, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.10);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.feature-card__body--front .feature-num{
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  font-size: 14px;
}

.feature-card__body--front h3{
  font-size: 18px;
  line-height: 1.35;
}


/* =========================================================
   7) 裏面（説明 + CTA）
   学習用メモ：
   - 裏面の見た目は現状採用
   - 説明文と CTA を読みやすく配置
   ========================================================= */
.feature-card__body--back{
  color: #ffffff;
}

.feature-card__body--back::before{
  content: "";
  position: absolute;
  inset: 10px;
  z-index: -1;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.42);
}

.feature-card__body--back h3,
.feature-card__body--back p{
  color: #ffffff;
}

.feature-card__cta{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  margin-top: auto;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  color: #0f172a;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .03em;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.16);
}


/* =========================================================
   8) 表面画像の見せ方切り替え
   学習用メモ：
   HTML側で front に下記クラスを追加して使う
   - feature-card__face--clear   : 画像くっきり
   - feature-card__face--soft    : 少し被せる
   - feature-card__face--covered : しっかり被せる

   例：
   <span class="feature-card__face feature-card__face--front feature-card__face--soft">
   ========================================================= */

/* 1) 画像くっきり */
.feature-card__face--clear .feature-card__bg{
  opacity: 1;
}

.feature-card__face--clear .feature-card__overlay{
  background: transparent;
}

/* 2) 少し被せる（おすすめ初期値） */
.feature-card__face--soft .feature-card__bg{
  opacity: 0.72;
}

.feature-card__face--soft .feature-card__overlay{
  background: linear-gradient(
    to top,
    rgba(15,23,42,0.34) 0%,
    rgba(15,23,42,0.10) 42%,
    rgba(255,255,255,0.00) 100%
  );
}

/* 3) しっかり被せる */
.feature-card__face--covered .feature-card__bg{
  opacity: 0.52;
}

.feature-card__face--covered .feature-card__overlay{
  background: linear-gradient(
    to top,
    rgba(15,23,42,0.46) 0%,
    rgba(15,23,42,0.20) 46%,
    rgba(255,255,255,0.04) 100%
  );
}


/* =========================================================
   9) Feature Modal
   学習用メモ：
   - PC: 左に画像 / 右に説明
   - SP: 上に画像 / 下に説明
   - モーダルの見た目は現状採用
   - 将来カルーセル化する場合は media 部分を拡張する
   ========================================================= */
.is-modal-open{
  overflow: hidden;
}

.feature-modal{
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
}

.feature-modal.is-open{
  display: block;
}

.feature-modal__backdrop{
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.62);
}

.feature-modal__dialog{
  position: relative;
  display: grid;
  grid-template-columns: minmax(320px, 1.15fr) minmax(280px, 0.85fr);
  width: min(1040px, calc(100% - 32px));
  max-height: calc(100vh - 48px);
  margin: 24px auto;
  overflow: hidden;
  border-radius: 20px;
  background: rgb(192, 192, 192);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
}

.feature-modal__close{
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 3;
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.72);
  color: #ffffff;
  font-size: 24px;
  cursor: pointer;
}

.feature-modal__close:hover{
  background: rgba(15, 23, 42, 0.86);
}

.feature-modal__media{
  min-height: 100%;
  background: #e5e7eb;
}

/* 学習用メモ：
   将来カルーセル化するならこの中を
   - メイン画像
   - 左右ボタン
   - サムネイル一覧
   に拡張しやすい */
.feature-modal__media img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #f8fafc;
}

.feature-modal__content{
  overflow: auto;
  padding: 32px 28px 24px;
}

.feature-modal__kicker{
  margin: 0 0 8px;
  color: #64748b;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.feature-modal__content h3{
  margin: 0 0 14px;
  color: #0f172a;
  font-size: 1.7rem;
  border-bottom: 1px dotted #000;
}

.feature-modal__content p{
  margin: 0;
  color: rgb(0, 0, 0);
  line-height: 1.9;
  font-weight: 800;
}

.feature-modal__points{
  margin: 18px 0 0;
  padding-left: 1.2em;
  color: #334155;
  line-height: 1.9;
}

.feature-modal__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn--ghost{
  border: 1px solid #cbd5e1;
  background: #ffffff;
  color: #0f172a;
}


/* =========================================================
   10) Responsive
   学習用メモ：
   - スマホでは flip を止めて表面のみ表示
   - モーダルは1カラム化
   ========================================================= */
@media (max-width: 767px){
  .feature-grid{
    grid-template-columns: 1fr;
  }

  .feature-card--flip{
    min-height: 190px;
    perspective: none;
    -webkit-perspective: none;
  }

  .feature-card--flip .feature-card__flip-inner{
    min-height: 190px;
    transform: none !important;
  }

  .feature-card--flip .feature-card__face{
    position: absolute;
    inset: 0;
  }

  .feature-card--flip .feature-card__face--front{
    display: block;
    transform: none;
  }

  .feature-card--flip .feature-card__face--back{
    display: none;
  }

  .feature-card--flip .feature-card__body{
    min-height: 190px;
  }

  .feature-card__body--front{
    justify-content: flex-end;
  }

  .feature-card__head--front{
    gap: 10px;
    padding: 10px 12px;
  }

  .feature-card__body--front .feature-num{
    flex: 0 0 36px;
    width: 36px;
    height: 36px;
    font-size: 13px;
  }

  .feature-card__body--front h3{
    font-size: 16px;
  }

  .feature-modal__dialog{
    grid-template-columns: 1fr;
    width: min(100%, calc(100% - 16px));
    max-height: calc(100vh - 16px);
    margin: 8px auto;
    border-radius: 16px;
  }

  .feature-modal__media{
    min-height: 220px;
    max-height: 42vh;
  }

  .feature-modal__content{
    padding: 22px 18px 20px;
  }

  .feature-modal__content h3{
    font-size: 1.35rem;
  }

  .feature-modal__actions{
    flex-direction: column;
  }

  .feature-modal__actions .btn,
  .feature-modal__actions .btn--ghost{
    width: 100%;
    justify-content: center;
  }
}