/* フローティングバナー（トップページ）
   SP(〜767px)：画面下に横長バナーを中央寄せで固定（高さ上限あり）
   PC(768px〜)：画面右下に正方形バナーを固定
   メインビューを過ぎるまでスクロールすると下からせり出す（.is-show）。
   サイズはここの変数だけで調整できる */
:root {
  --fb-sp-max-height: 110px; /* SP：バナー画像の高さ上限 */
  --fb-sp-gap: 8px;          /* SP：画面端との余白 */
  --fb-pc-size: 150px;       /* PC：正方形バナーの一辺 */
  --fb-pc-gap: 24px;         /* PC：画面端との余白 */
}

.rb-floating-banner {
  position: fixed;
  z-index: 1040; /* ヘッダー(1030)より上、モーダル(1050)より下 */
  left: 50%;
  bottom: calc(var(--fb-sp-gap) + env(safe-area-inset-bottom, 0px));
  width: calc(100% - var(--fb-sp-gap) * 2);
  transform: translate(-50%, calc(100% + 40px));
  opacity: 0;
  visibility: hidden;
  transition:
    transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1),
    opacity 0.3s ease,
    visibility 0s linear 0.6s;
}
.rb-floating-banner.is-show {
  transform: translate(-50%, 0);
  opacity: 1;
  visibility: visible;
  transition:
    transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1),
    opacity 0.3s ease,
    visibility 0s;
}

.rb-floating-banner__inner {
  position: relative;
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
}
.rb-floating-banner__link {
  display: block;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.18));
  transition: transform 0.2s ease;
}
.rb-floating-banner__link:hover {
  transform: translateY(-2px);
}
.rb-floating-banner__img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: var(--fb-sp-max-height);
}

.rb-floating-banner__close {
  position: absolute;
  top: -10px;
  right: -4px;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 2px solid #fff;
  border-radius: 50%;
  background: #333;
  color: #fff;
  font-size: 16px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.rb-floating-banner__close:hover {
  background: #000;
}
.rb-floating-banner__close:focus-visible {
  outline: 2px solid #1a73e8;
  outline-offset: 2px;
}

@media (min-width: 768px) {
  .rb-floating-banner {
    left: auto;
    right: var(--fb-pc-gap);
    bottom: var(--fb-pc-gap);
    width: var(--fb-pc-size);
    transform: translateY(calc(100% + var(--fb-pc-gap) + 20px));
  }
  .rb-floating-banner.is-show {
    transform: translateY(0);
  }
  .rb-floating-banner__img {
    width: 100%;
    max-height: none;
  }
  .rb-floating-banner__close {
    top: -12px;
    right: -12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rb-floating-banner,
  .rb-floating-banner.is-show {
    transition: opacity 0.2s ease, visibility 0s;
  }
}