/*
 * 20周年記念リンク専用スタイル
 * 既存CSSと衝突しないよう anniversary20 名前空間に限定しています。
 */
.anniversary20 {
  position: absolute;
  z-index: 3;
  top: 55%;
  left: 50%;
  width: min(86vw, 560px);
  transform: translateX(-50%);
  text-align: center;
  pointer-events: none;
}

.anniversary20__link {
  display: inline-block;
  padding: 0.45em 0.8em;
  color: #fff;
  text-decoration: none;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 1.05s ease, transform 1.05s ease, filter 0.25s ease;
  pointer-events: auto;
  -webkit-tap-highlight-color: transparent;
}

.anniversary20.is-visible .anniversary20__link {
  opacity: 1;
  transform: translateY(0);
}

.anniversary20__text {
  display: block;
  color: #fff;
  font-weight: 500;
  font-size: clamp(1.15rem, 4.4vw, 2rem);
  line-height: 1.35;
  letter-spacing: 0.08em;
  text-shadow:
    0 0 5px rgba(246, 128, 0, 0.95),
    0 0 12px rgba(246, 128, 0, 0.82),
    0 0 24px rgba(246, 128, 0, 0.62),
    0 2px 4px rgba(0, 0, 0, 0.18);
}

.anniversary20__link:hover,
.anniversary20__link:focus-visible {
  filter: brightness(1.12);
  outline: none;
}

.anniversary20__link:focus-visible {
  border-radius: 4px;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.72);
}

@media (min-width: 768px) {
  .anniversary20 {
    top: 56%;
    width: min(70vw, 680px);
  }

  .anniversary20__text {
    font-size: clamp(1.5rem, 2.8vw, 2.4rem);
  }
}

@media (min-width: 1200px) {
  .anniversary20 {
    top: 57%;
  }

  .anniversary20__text {
    font-size: clamp(1.8rem, 2.2vw, 2.65rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .anniversary20__link {
    transition: none;
    transform: none;
  }
}