#contents .sub h3::before {
  border: none;
  padding: 0;
}

#contents .sub h3 {
  margin: 0;
  padding: 0.5em;
  color: #fff;
  font-weight: normal;
  font-size: 1.1rem;
  text-align: center;
  border: none;
  background: var(--header-gradient-alt);
}

#contents .sub h3 a {
  color: inherit;
}

.submenu {
  margin: 0 0 1rem;
  padding: 0;
}

.submenu li {
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.submenu a {
  display: block;
  padding: 0.2rem 1rem;
  text-decoration: none;
  background: var(--surface);
}

.submenu a::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  margin-right: 0.8em;
  color: #ababab;
  border-top: 0.28em solid transparent;
  border-bottom: 0.28em solid transparent;
  border-left: 0.4em solid currentColor;
  vertical-align: middle;
  transition: 0.3s;
}

.submenu a:hover::before {
  color: #666;
}

.box1 {
  margin-bottom: 1rem;
  padding: 10px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 5px;
}

.sub .box1 .submenu {
  margin-bottom: 0;
}

.sub .category-card {
  margin-top: 8px;
  margin-bottom: 8px;
  padding: 10px;
  border: 1px solid rgba(34, 87, 142, 0.22);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-card-soft);
}

.sub .category-card h3 {
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 8px;
  background: var(--header-gradient-alt);
}

.sub .category-card .submenu {
  margin: 8px 0 0;
}

.sub .category-card .submenu li {
  margin-bottom: 6px;
  border: none;
}

.sub .category-card .submenu li:last-child {
  margin-bottom: 0;
}

.sub .category-card .submenu li.submenu-group {
  margin-top: 8px;
  margin-bottom: 4px;
}

.sub .category-card .submenu li.submenu-group details summary {
  display: flex;
  align-items: center;
  padding: 0.4rem 0.6rem;
  color: #1d5f95;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  list-style: none;
  cursor: pointer;
  user-select: none;
  border-left: 3px solid #2b87c9;
  border-radius: 6px;
  background: rgba(29, 95, 149, 0.08);
  transition: background 0.2s ease;
}

.sub
  .category-card
  .submenu
  li.submenu-group
  details
  summary::-webkit-details-marker {
  display: none;
}

.sub .category-card .submenu li.submenu-group details summary::after {
  content: "▼";
  display: inline-block;
  margin-left: auto;
  font-size: 0.65rem;
  transition: transform 0.2s ease;
}

.sub .category-card .submenu li.submenu-group details[open] summary::after {
  transform: rotate(180deg);
}

.sub .category-card .submenu li.submenu-group details summary:hover {
  background: rgba(29, 95, 149, 0.14);
}

.sub .category-card .submenu .submenu-sub {
  margin: 4px 0 4px 8px;
  padding: 0;
  list-style: none;
}

.sub .category-card .submenu .submenu-sub li {
  margin-bottom: 4px;
}

.sub .category-card .submenu .submenu-sub li:last-child {
  margin-bottom: 0;
}

.sub .category-card .submenu a {
  padding: 0.45rem 0.85rem;
  color: #13283d;
  font-size: 0.94rem;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0.01em;
  word-break: normal;
  overflow-wrap: break-word;
  border: 1px solid rgba(29, 95, 149, 0.16);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 2px 8px rgba(12, 34, 60, 0.06);
  transition:
    transform 0.2s ease,
    color 0.2s ease,
    background-color 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.sub .category-card .submenu a .submenu-subline {
  display: block;
  text-align: right;
}

.sub .category-card .submenu a::before {
  color: #2b6ea0;
}

.sub .category-card .submenu a:hover {
  color: #0e2337;
  background: #f5faff;
  border-color: rgba(43, 135, 201, 0.45);
  box-shadow: 0 6px 14px rgba(12, 34, 60, 0.14);
  transform: translateY(-1px);
}

.social-block {
  margin-top: 28px;
  text-align: center;
}

.social-links {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.social-link {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 56px;
  height: 56px;
}

.social-link.is-large {
  width: 170px;
  height: 170px;
}

.social-link.youtube {
  width: 220px;
  height: 220px;
}

.social-link img,
.social-qr img {
  display: block;
  max-width: 100%;
  height: auto;
}

.social-qr {
  display: flex;
  justify-content: center;
  margin-top: 10px;
}

.social-qr img {
  width: 150px;
}

@media screen and (max-width: 899px) {
  .sub .category-card .submenu a .submenu-subline {
    display: inline;
    margin-left: 0.3em;
    text-align: left;
  }
}