img {
  display: block;
  width: 100%;
  max-width: 720px;
  margin: 10px auto;
}

.search-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  width: auto;
  min-width: 200px;
  max-width: 280px;
  padding: 16px 24px;
  text-decoration: none;
  color: #FFFFFF;
  background: linear-gradient(135deg, #007BFF 0%, #0056B3 100%);
  font-weight: bold;
  font-size: 14px;
  line-height: 1.4;
  text-align: center;
  white-space: nowrap;
  border-radius: 50px;
  border: none;
  box-shadow: 2px 4px 2px #489efa;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  /* アニメーション効果 */
  animation: float 3s ease-in-out infinite;
}

.search-btn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 30px rgba(0, 123, 255, 0.4);
  background: linear-gradient(135deg, #0056B3 0%, #004085 100%);
}

.search-btn:active {
  transform: translateY(0) scale(1.02);
  box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

/* フローティングアニメーション */
@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-5px);
  }
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .search-btn {
    bottom: 15px;
    right: 15px;
    min-width: 160px;
    max-width: 220px;
    padding: 14px 20px;
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .search-btn {
    bottom: 10px;
    right: 10px;
    min-width: 140px;
    max-width: 180px;
    padding: 12px 16px;
    font-size: 12px;
  }
}

@media(min-width: 700px) {
  .search-btn {
    font-size: 20px;
    max-width: 330px;
  }
}

/* アクセシビリティ向上 */
.search-btn:focus {
  outline: 3px solid rgba(0, 123, 255, 0.5);
  outline-offset: 2px;
}