.side-nav {
  --side-nav-title-color: #152535;

  max-height: calc(100vh - 40px);
  overflow-y: auto;
}

.side-nav-inner {
  background: #ffffff;
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.side-nav-title,
.side-nav-category-title,
.side-nav h2.side-nav-title,
.side-nav h2.side-nav-category-title,
.side-nav h3.side-nav-title,
.side-nav h3.side-nav-category-title {
  margin: 0 0 12px;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--side-nav-title-color);
  letter-spacing: normal;
  opacity: 1;
  scroll-margin-top: 80px;
}

.side-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.side-nav-list li {
  margin: 0;
}

.side-nav a,
.side-nav-list a {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  text-decoration: none;
  color: #333;
  font-size: 14px;
  line-height: 1.4;
  transition: all 0.2s ease;
}

.side-nav a:hover,
.side-nav-list a:hover {
  background: rgba(45, 138, 78, 0.08);
  transform: translateX(2px);
}

.side-nav a.active,
.side-nav-list a.active {
  background: rgba(45, 138, 78, 0.12);
  color: #2d8a4e;
  font-weight: 700;
  position: relative;
}

.side-nav a.active::before,
.side-nav-list a.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20%;
  bottom: 20%;
  width: 3px;
  background: #2d8a4e;
  border-radius: 2px;
}

.side-nav-category {
  margin-top: 16px;
  padding: 16px;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.side-nav-category-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.side-nav-category-list li {
  margin: 0;
}

.side-nav-category-list a {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  text-decoration: none;
  color: #333;
  font-size: 14px;
  line-height: 1.45;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid rgba(0, 0, 0, 0.04);
  transition: background 0.2s ease;
}

.side-nav-category-list a:hover {
  background: rgba(45, 138, 78, 0.08);
  color: #2d8a4e;
}

.side-nav-category--empty .side-nav-inspector-empty {
  margin: 0;
  font-size: 13px;
  color: #757575;
}

@media (max-width: 1023px) {
  .side-nav {
    max-height: none;
    overflow-y: visible;
    width: 100%;
  }
}

/* Mobile: nav-card（サンプル準拠） */
@media (max-width: 767px) {
  .side-nav {
    width: 100%;
  }

  .side-nav-inner {
    padding: 18px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(213, 233, 230, 0.9);
    box-shadow: 0 18px 45px rgba(30, 76, 92, 0.13);
  }

  .side-nav-title,
  .side-nav-category-title,
  .side-nav h2.side-nav-title,
  .side-nav h2.side-nav-category-title,
  .side-nav h3.side-nav-title,
  .side-nav h3.side-nav-category-title {
    margin: 0 0 14px;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: normal;
    opacity: 1;
    color: var(--side-nav-title-color);
  }

  .side-nav-list {
    display: grid;
    gap: 9px;
  }

  .side-nav a,
  .side-nav-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 48px;
    padding: 10px 14px;
    border-radius: 13px;
    background: #f2fbf4;
    border: 1px solid #dcefe3;
    font-size: 15px;
    font-weight: 800;
    color: #16303b;
    box-shadow: none;
  }

  .side-nav a::after,
  .side-nav-list a::after {
    content: "›";
    flex-shrink: 0;
    margin-left: 12px;
    color: #19834a;
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1;
  }

  .side-nav a:hover,
  .side-nav-list a:hover {
    background: #eaf7ee;
    transform: none;
    border-color: #cfe8d8;
  }

  .side-nav a.active,
  .side-nav-list a.active {
    background: rgba(45, 138, 78, 0.14);
    color: #19834a;
    border-color: rgba(45, 138, 78, 0.28);
    box-shadow: 0 4px 12px rgba(45, 138, 78, 0.1);
  }

  .side-nav a.active::before,
  .side-nav-list a.active::before {
    left: 0;
    top: 18%;
    bottom: 18%;
    width: 4px;
    border-radius: 0 2px 2px 0;
    background: #46c95b;
  }

  .side-nav-category {
    margin-top: 18px;
    padding: 18px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(213, 233, 230, 0.9);
    box-shadow: 0 18px 45px rgba(30, 76, 92, 0.13);
  }

  .side-nav-category-list {
    gap: 9px;
  }

  .side-nav-category-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 48px;
    padding: 10px 14px;
    border-radius: 13px;
    background: #f2fbf4;
    border: 1px solid #dcefe3;
    font-size: 15px;
    font-weight: 800;
    color: #16303b;
  }

  .side-nav-category-list a::after {
    content: "›";
    flex-shrink: 0;
    margin-left: 12px;
    color: #19834a;
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1;
  }

  .side-nav-category-list a:hover {
    background: #eaf7ee;
    color: #19834a;
  }
}