.hint-block > details {
  border: 1.5px solid #2c7be5;
  border-radius: 10px;
  margin: 20px 0;
  overflow: hidden;
  background: #f0f8ff;
  border-bottom: 3px solid #2568c2;
  border-right: 3px solid #2568c2;
}

.hint-block > details > summary {
  background:#5aa0f0;
  color: #fff;
  padding: 10px 15px;
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  border-radius: 8px 8px 0 0;
}

.hint-block > details > summary::-webkit-details-marker { display: none; }
.hint-block > details > summary::before {
  content: "▶";
  font-size: 11px;
  transition: transform 0.2s;
  display: inline-block;
}

.hint-block > details[open] > summary::before {
  transform: rotate(90deg);
}

.hint-block > details > .details-body {
  padding: 14px 16px;
  background: #ebf5ff;
  color: black;
  font-family: Arial, sans-serif;
  font-size: 15px;
  display: block;
  padding: 24px 16px 16px 16px;
}

.hint-block > details > .details-body details {
  margin: 12px 0 0 20px;
  border: 1px solid #3993ea;
  border-radius: 8px;
  background: #cce7ff;
  overflow: hidden;
  padding: 0;
}

.hint-block > details > .details-body details > summary {
  background: #4a99f0;
  color: #fff;
  padding: 8px 12px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  border-radius: 6px;
}

.hint-block > details > .details-body details > summary::-webkit-details-marker { display: none; }
.hint-block > details > .details-body details > summary::before {
  content: "▶";
  font-size: 10px;
  color: #fff;
  transition: transform 0.2s;
}

.hint-block > details > .details-body details[open] > summary::before {
  transform: rotate(90deg);
}

.hint-block > details > .details-body details > .details-body {
  background: #ebf5ff;
  padding: 10px 14px;
  border-radius: 0 0 6px 6px;
  color: #1a3d6b;
  font-size: 14px;
  line-height: 1.4;
}

.check-block {
  margin: 20px 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1.5px solid #d8d8d8;
  border-bottom: 3px solid #a8a8a8;
  border-right: 3px solid #a8a8a8;
}
.check-block summary {
  background: #e0e0e0;
  color: #3b3b3b;
  padding: 10px 15px;
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.check-block summary::-webkit-details-marker { display: none; }
.check-block summary::before {
  content: "▶";
  font-size: 11px;
  transition: transform 0.2s;
  display: inline-block;
}
.check-block details[open] summary::before {
  transform: rotate(90deg);
}
.check-block details {
  background: #f9f9f9;
  padding: 0;
}
.check-block .check-body {
  padding: 14px 16px;
}

.instructions {
  background: #fafafa;
  border-left: 4px solid #FFA726; /* #FB8C00 */
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 1em 0 1.5em;
  font-size: 0.97em;
}