.btn a {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  max-width: 300px;
  height: 60px;
  color: #333;
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  box-sizing: border-box;
  padding: 0 20px;
}

.btn a:focus {
  outline: 3px solid #ffcc00;
  outline-offset: 4px;
}

.btn a:hover {
  color: #fff;
}

.btn04 a {
  background-color: #ceb849;
  border: 1px solid transparent;
  border-radius: 35px;
}

.btn04 a::before {
  content: '';
  position: absolute;
  top: -5px;
  left: -5px;
  width: calc(100% + 10px);
  height: calc(100% + 10px);
  background-color: transparent;
  border: 1px solid #333;
  border-radius: 40px;
  z-index: -1;
}

.btn04 a:hover {
  background-color: #b99b00;
}


.btn a {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 100%;
  max-width: 300px;
  height: 60px;
  color: #ffffff;
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  box-sizing: border-box;
  padding: 0 20px;
  border-radius: 30px;
  background: linear-gradient(135deg, #4a90e2, #357ABD);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.btn a:hover {
  background: linear-gradient(135deg, #357ABD, #2c5aa0);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.15);
  color: #fff;
}

.btn a:focus {
  outline: 3px solid #ffcc00;
  outline-offset: 4px;
}

.btn04 a::before {
  content: '';
  position: absolute;
  top: -5px;
  left: -5px;
  width: calc(100% + 10px);
  height: calc(100% + 10px);
  background-color: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 35px;
  z-index: -1;
}




body {
  font-family: sans-serif;
  padding: 20px;
}


}


@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

.accordion-image {
  max-width: 100%;
  width: 300px;
  height: auto;
  display: block;
  margin: 1em auto 0;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}




.section-heading {
  text-align: center;
  font-size: 2em;
  font-weight: bold;
  color: #2c3e50;
  margin: 2em 0 0.5em;
  position: relative;
}

.section-heading::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: #f39c12;
  margin: 0.5em auto 0;
  border-radius: 2px;
}

.section-subtitle {
  text-align: center;
  font-size: 0.9em;
  color: #7f8c8d;
  margin-bottom: 2em;
  font-style: italic;
}



.floor-title {
  font-size: 1.1em;
  font-weight: bold;
  color: #2c3e50;
  text-align: left;
  padding: 0.5em 0;
  margin: 2em 0 1em;
  border-bottom: 4px solid #2c3e91; /* ネイビー系の洗練された色 */
}

/*.border-box {
  background: #fdfcf8;
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 1.5em;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  margin-bottom: 2em;
}*/


.accordion-label {
  background-color: #f0f4ff;
  padding: 16px 20px;
  cursor: pointer;
  font-weight: bold;
  font-size: 1em;
  border: 1px solid #aac4f6;
  border-radius: 8px;
  margin-bottom: 8px;
  transition: background-color 0.3s, box-shadow 0.3s;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;


}

.accordion-label:hover,
.accordion-label:focus {
  background-color: #dbe8ff;
  outline: none;
  box-shadow: 0 0 0 3px rgba(102, 138, 216, 0.3);
}

.accordion-label.active {
  background-color: #c2dbff;
}

.accordion-content {
  display: none;
  padding: 16px 20px;
  border: 1px solid #aac4f6;
  border-top: none;
  background-color: #ffffff;
  border-radius: 0 0 8px 8px;
  animation: fadeIn 0.3s ease-in-out;
}

.accordion-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
}

.accordion {
  flex: 1 1 calc(33.333% - 16px);
  box-sizing: border-box;
  min-width: 280px;
}


.accordion-item {
  height: 100%;
  display: flex;
  flex-direction: column;
}


@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

.accordion-image {
  max-width: 100%;
  width: 300px;
  height: auto;
  display: block;
  margin: 1em auto 0;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}


/* レスポンシブ対応：アコーディオンを2列・1列に切り替え */
@media (max-width: 900px) {
  .accordion {
    flex: 1 1 calc(50% - 16px);
  }
}

@media (max-width: 600px) {
  .accordion {
   flex: 1 1 100%;
  }
}