/* ==================================================
   Floating Purchase Banner
   PC: LP本体(最大700px)をクリッピング領域にする
   黒バー + 白パネルは最初から存在し、右側から一体でスライド
   ================================================== */

.floating-purchase {
  --floating-tab-width: 52px;
  --floating-panel-width: 210px;

  position: fixed;
  top: 70%;

  /* LP右端を基準に、フローティング本体の幅だけ配置する */
  left: calc(50% + min(350px, 50vw));
  right: auto;
  width: calc(var(--floating-tab-width) + var(--floating-panel-width));

  display: flex;
  justify-content: flex-end;
  align-items: stretch;

  z-index: 9999;
  box-sizing: border-box;

  /*
    黒バー + 白パネルの実寸だけをクリッピング領域にする。
    これにより、LP全幅の透明な固定領域が下のリンク操作を邪魔しない。
  */
  overflow: hidden;

  /* 親の右端をLP右端に合わせる。横スライドは子要素にかける */
  transform: translate3d(-100%, -50%, 0);

  /* 親の空き領域は下のコンテンツへのクリックを通す */
  pointer-events: none;

  font-family:
    "Noto Sans JP",
    "Hiragino Kaku Gothic ProN",
    "Yu Gothic",
    sans-serif;
}


/* ==================================================
   CLOSED / OPEN
   ================================================== */

/*
  閉じている状態：
  黒バー + 白パネルを白パネル幅ぶん右へ移動。
  黒バーだけLP右端に残り、白パネルはLP枠外へ出て overflow:hidden で隠れる。
*/
.floating-purchase__toggle,
.floating-purchase__panel {
  transform: translate3d(var(--floating-panel-width), 0, 0);
  transition: transform 0.35s ease;
  will-change: transform;
}

/* クリック判定は実際に操作する要素だけに限定 */
.floating-purchase__toggle {
  pointer-events: auto;
}

.floating-purchase__panel {
  pointer-events: none;
}

.floating-purchase__panel a[href]:not([href="#"]),
.floating-purchase__panel button {
  pointer-events: auto;
}

/*
  開いた状態：
  もともと右側に存在していた白パネルが、
  黒バーと同時に左へスライドしてLP内へ入る。
*/
.floating-purchase.is-open .floating-purchase__toggle,
.floating-purchase.is-open .floating-purchase__panel {
  transform: translate3d(0, 0, 0);
}


/* ==================================================
   黒い開閉バー
   ================================================== */

.floating-purchase__toggle {
  flex:
    0
    0
    var(--floating-tab-width);

  width:
    var(--floating-tab-width);

  min-height: 220px;

  margin: 0;
  padding: 0;

  border: 0;

  background: #000;
  color: #fff;

  cursor: pointer;

  display: flex;

  align-items: center;
  justify-content: center;

  box-sizing: border-box;

  appearance: none;
  -webkit-appearance: none;

  /*
    白パネルより前面に置く
  */
  position: relative;
  z-index: 2;
}


/* ==================================================
   閉じている時の内容
   ================================================== */

.floating-purchase__closed {
  display: flex;

  flex-direction: column;

  align-items: center;
  justify-content: center;

  gap: 16px;

  width: 100%;
}


.floating-purchase__label {
  writing-mode: vertical-rl;

  font-size: 15px;
  line-height: 1.4;

  letter-spacing: 0.15em;

  color: #fff;
}

/* ==================================================
   開いている時の ×
   ================================================== */

.floating-purchase__open-icon {
  display: none;

  width: 100%;

  padding-top: 12px;

  box-sizing: border-box;

  font-size: 18px;
  line-height: 1;

  font-weight: 300;

  text-align: center;

  color: #fff;
}


.floating-purchase.is-open
.floating-purchase__closed {
  display: none;
}


.floating-purchase.is-open
.floating-purchase__open-icon {
  display: block;
}


/* ==================================================
   白パネル

   重要：
   opacity / visibility / display の
   切り替えは一切しない
   ================================================== */

.floating-purchase__panel {
  flex:
    0
    0
    var(--floating-panel-width);

  width:
    var(--floating-panel-width);

  padding:
    18px
    18px
    20px;

  background: #fff;

  box-sizing: border-box;

  box-shadow:
    0 3px 12px
    rgba(0, 0, 0, 0.18);

  /*
    常に表示状態。
    閉じているときは親ごと
    右側の画面外へ移動しているだけ。
  */
  opacity: 1;
  visibility: visible;

  pointer-events: none;

  position: relative;
  z-index: 1;
}


/* ==================================================
   商品画像
   ================================================== */

.floating-purchase__image {
  width: 100%;

  margin:
    0
    auto
    15px;

  text-align: center;
}


.floating-purchase__image img {
  display: block;

  width: 100%;

  max-width: 170px;

  height: auto;

  margin:
    0
    auto;
}


/* ==================================================
   購入項目
   ================================================== */

.floating-purchase__item {
  display: block;

  margin: 0;

  padding:
    10px
    0;

  color: #000;

  text-decoration: none;

  border-top:
    1px
    solid
    #eee;

  box-sizing: border-box;
}


.floating-purchase__item:first-of-type {
  border-top: 0;
}


.floating-purchase__price,
.floating-purchase__sub {
  margin:
    0
    0
    6px;

  padding: 0;

  color: #000;

  text-align: center;

  font-size: 12px;
  line-height: 1.5;
}


.floating-purchase__sub {
  font-size: 12px;
}


/* ==================================================
   購入ボタン
   ================================================== */

.floating-purchase__button {
  display: flex;

  width: 100%;

  min-height: 32px;

  align-items: center;
  justify-content: center;

  gap: 5px;

  padding:10px  8px;

  box-sizing: border-box;

  background: #000;
  color: #fff;

  font-size: 12px;
  line-height: 1.3;

  text-align: center;
}

.floating-purchase__button-icon {
  display: block;
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
  object-fit: contain;
}

/* ==================================================
   hover
   ================================================== */

@media (hover: hover) {

  .floating-purchase__item:hover
  .floating-purchase__button {
    opacity: 0.75;
  }

}


/* ==================================================
   Smartphone
   ================================================== */

@media (max-width: 700px) {

  .floating-purchase {
    --floating-tab-width: 38px;
    --floating-panel-width: 165px;
    right: 0;
  }


  .floating-purchase__toggle {
    min-height: 140px;
  }


  .floating-purchase__panel {
    padding:
      15px
      14px
      17px;
  }


  .floating-purchase__image img {
    max-width: 115px;
  }


  .floating-purchase__label {
    font-size: 14px;
  }


  .floating-purchase__price {
    font-size: 12px;
  }


  .floating-purchase__sub {
    font-size: 12px;
  }


  .floating-purchase__button {
    min-height: 30px;

    font-size: 12px;
  }

}