.overlay-banner {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.overlay-banner.is-visible {
  opacity: 1;
  visibility: visible;
}

.overlay-banner__backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
}

.overlay-banner__content {
  position: relative;
  max-width: 500px;
  max-height: 90vh;
  background: #fff;
  border-radius: 12px;
  padding: 0;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  animation: slideUp 0.3s ease;
  overflow: hidden;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.overlay-banner__close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  z-index: 10;
}

.overlay-banner__close:hover {
  background: rgba(0, 0, 0, 0.8);
}

/* ヘッダー部分（ポップなデザイン） */
.overlay-banner__header {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  padding: 30px 20px 40px;
  text-align: center;
  color: #fff;
  position: relative;
}

/* 装飾的な背景パターン */
.overlay-banner__header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 10px,
      rgba(255, 255, 255, 0.05) 10px,
      rgba(255, 255, 255, 0.05) 20px
    );
}

.overlay-banner__title {
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 15px;
  letter-spacing: 0.1em;
  position: relative;
  z-index: 1;
}

.overlay-banner__amount {
  font-size: 64px;
  font-weight: 900;
  margin-bottom: 15px;
  position: relative;
  z-index: 1;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
  line-height: 1;
}

.overlay-banner__amount-unit {
  font-size: 28px;
  font-weight: 600;
  margin-left: 4px;
}

.overlay-banner__expiry {
  font-size: 18px;
  font-weight: 700;
  position: relative;
  z-index: 1;
  display: inline-block;
  background: rgba(255, 255, 255, 0.25);
  padding: 8px 20px;
  border-radius: 20px;
  backdrop-filter: blur(10px);
}

.overlay-banner__notice {
  font-size: 12px;
  font-weight: 400;
  position: relative;
  z-index: 1;
  margin-top: 12px;
  line-height: 1.6;
  opacity: 0.85;
}

.overlay-banner__notice-main {
  font-size: 14px;
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

.overlay-banner__notice-sub {
  font-size: 12px;
  font-weight: 400;
}

/* バナー画像部分 */
.overlay-banner__link {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 20px;
}

.overlay-banner__image {
  display: block;
  width: 100%;
  height: auto;
  max-width: 600px;
  margin: 0 auto;
  border-radius: 8px;
}

/* ボタン */
.overlay-banner__button {
  display: block;
  background: #e91e63;
  color: #fff;
  text-align: center;
  padding: 15px 30px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: bold;
  text-decoration: none;
  margin: 30px 20px 30px;
  transition: background 0.3s;
}

.overlay-banner__button:hover {
  background: #c2185b;
}

/* テキスト */
.overlay-banner__text {
  margin: 0 20px 20px;
  text-align: center;
  font-size: 14px;
  color: #666;
  font-weight: 500;
}

/* タブレット */
@media (max-width: 768px) {
  .overlay-banner__content {
    max-width: 85%;
  }
  
  .overlay-banner__header {
    padding: 25px 15px 35px;
  }

  .overlay-banner__title {
    font-size: 16px;
  }

  .overlay-banner__amount {
    font-size: 54px;
  }

  .overlay-banner__amount-unit {
    font-size: 24px;
  }

  .overlay-banner__expiry {
    font-size: 16px;
    padding: 7px 18px;
  }

  .overlay-banner__notice {
    font-size: 11px;
    margin-top: 10px;
  }

  .overlay-banner__notice-main {
    font-size: 13px;
    margin-bottom: 3px;
  }

  .overlay-banner__notice-sub {
    font-size: 11px;
  }

  .overlay-banner__link {
    padding: 15px;
  }

  .overlay-banner__link--hidden {
    display: none !important;
    padding: 0;
  }
  
  .overlay-banner__image {
    max-width: 100%;
  }

  .overlay-banner__button {
    font-size: 15px;
    padding: 13px 25px;
    margin: 25px 15px 25px;
  }
  
  .overlay-banner__text {
    font-size: 13px;
    margin: 0 15px 15px;
  }
}

/* スマートフォン */
@media (max-width: 480px) {
  .overlay-banner__content {
    max-width: 95%;
  }
  
  .overlay-banner__close {
    width: 36px;
    height: 36px;
    top: 8px;
    right: 8px;
  }

  .overlay-banner__header {
    padding: 20px 12px 30px;
  }

  .overlay-banner__title {
    font-size: 14px;
  }

  .overlay-banner__amount {
    font-size: 48px;
  }

  .overlay-banner__amount-unit {
    font-size: 20px;
  }

  .overlay-banner__expiry {
    font-size: 14px;
    padding: 6px 16px;
  }

  .overlay-banner__notice {
    font-size: 10px;
    margin-top: 8px;
  }

  .overlay-banner__notice-main {
    font-size: 11px;
    margin-bottom: 2px;
  }

  .overlay-banner__notice-sub {
    font-size: 10px;
  }

  .overlay-banner__link {
    padding: 12px;
  }

  .overlay-banner__link--hidden {
    display: none !important;
    padding: 0;
  }

  .overlay-banner__button {
    font-size: 14px;
    padding: 12px 20px;
    margin: 20px 12px 20px;
  }
  
  .overlay-banner__text {
    font-size: 12px;
    margin: 0 12px 12px;
  }
}