.calculator-menu {
  position: relative;
  z-index: 100;
  isolation: isolate;
  flex: 0 0 auto;
}

.calculator-menu__details > summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--bgk-line);
  border-radius: 999px;
  background: #ffffff;
  color: var(--bgk-ink);
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

.calculator-menu__details > summary::-webkit-details-marker {
  display: none;
}

.calculator-menu__details > summary::after {
  content: "+";
  color: var(--bgk-accent-strong);
  font-size: 1.15rem;
  line-height: 1;
}

.calculator-menu__details[open] > summary::after {
  content: "−";
}

.calculator-menu__details > summary:hover,
.calculator-menu__details > summary:focus-visible {
  border-color: var(--bgk-accent);
  color: var(--bgk-accent-strong);
}

.calculator-menu__panel {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  z-index: 110;
  width: min(820px, calc(100vw - 32px));
  max-height: calc(100vh - 112px);
  padding: 22px;
  overflow-y: auto;
  border: 1px solid #cbd5e1;
  border-radius: 24px;
  background: #ffffff;
  box-shadow: 0 28px 70px rgba(12, 35, 29, 0.28);
  opacity: 1;
  backdrop-filter: none;
  transform: translateX(-50%);
}

.calculator-menu__heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--bgk-line);
}

.calculator-menu__heading strong {
  font-size: 1.1rem;
}

.calculator-menu__heading a {
  color: var(--bgk-accent-strong);
  font-weight: 800;
}

.calculator-menu__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px 28px;
  padding-top: 18px;
}

.calculator-menu__group h2 {
  margin: 0 0 9px;
  color: var(--bgk-ink);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  line-height: 1.25;
  text-transform: uppercase;
}

.calculator-menu__group ul {
  display: grid;
  gap: 3px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.calculator-menu__group li {
  margin: 0;
  list-style: none;
}

.calculator-menu__group a {
  display: block;
  padding: 7px 0;
  color: var(--bgk-ink-soft);
  font-size: 0.92rem;
  line-height: 1.25;
  text-decoration: none;
}

.calculator-menu__group a:hover,
.calculator-menu__group a:focus-visible {
  color: var(--bgk-accent-strong);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.bgtool-hub--featured .bgtool-hub__grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 1120px) {
  .calculator-menu__panel {
    left: 0;
    transform: none;
  }

  .calculator-menu__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .site-header__inner {
    flex-wrap: wrap;
  }

  .calculator-menu {
    margin-left: auto;
  }

  .calculator-menu__panel {
    right: 0;
    left: auto;
    width: min(430px, calc(100vw - 32px));
    max-height: 65vh;
    padding: 18px;
  }

  .calculator-menu__grid,
  .bgtool-hub--featured .bgtool-hub__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .calculator-menu__details > summary {
    min-height: 42px;
    padding: 0 14px;
  }

  .calculator-menu__heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .calculator-menu__grid,
  .bgtool-hub--featured .bgtool-hub__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1100px) {
  body.page-id-172 .page-shell__main,
  body.page-id-172 .page-shell__aside,
  body.page-id-172 .content-card--page,
  body.page-id-172 .entry-content,
  body.page-id-172 .bgsc-examples,
  body.page-id-172 .bgsc-examples-table-wrap {
    min-width: 0;
    max-width: 100%;
  }
}

@media (max-width: 430px) {
  .brand-mark__text small {
    display: none;
  }

  .calculator-menu__details > summary {
    padding: 0 12px;
    font-size: 0.9rem;
  }

  .calculator-menu__panel {
    position: fixed;
    top: 72px;
    right: 12px;
    width: calc(100vw - 24px);
    max-height: calc(100vh - 88px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .calculator-menu * {
    scroll-behavior: auto !important;
  }
}

:root[data-theme="dark"] .calculator-menu__details > summary,
:root[data-theme="dark"] .calculator-menu__panel {
  border-color: #526a61;
  background: #0f1f19;
  color: #f8fafc;
}

:root[data-theme="dark"] .calculator-menu__group h2 {
  color: #f8fafc;
}

:root[data-theme="dark"] .calculator-menu__group a {
  color: #c7d6d0;
}