body.tool-formula-reference {
  --brand: #78652f;
  --brand-dark: #594a22;
  --brand-soft: #f5f0df;
}
.reference-page {
  display: block;
  width: min(100% - 16px, 1240px);
  margin: auto;
  padding-block: 12px 40px;
}
.reference-hero {
  display: grid;
  gap: 8px;
  margin-bottom: 10px;
}
.reference-hero h1 {
  font-size: clamp(1.65rem, 4vw, 2.5rem);
}
.reference-hero p {
  margin: 0;
  color: var(--muted);
}
.reference-notice {
  padding: 9px 10px;
  border-left: 3px solid var(--brand);
  border-radius: 0 10px 10px 0;
  background: var(--brand-soft);
  font-size: 0.78rem;
}
.reference-search-wrap {
  position: static;
  padding: 7px 0;
  background: #f6f9f9;
}
.reference-search {
  width: 100%;
  min-height: 48px;
  padding: 10px 14px;
  border: 2px solid var(--brand);
  border-radius: 12px;
  background: #fff;
  font-size: 1rem;
  font-weight: 700;
  outline: none;
}
.reference-search-box {
  position: relative;
}
.reference-search {
  padding-right: 72px;
}
.search-clear {
  position: absolute;
  top: 50%;
  right: 9px;
  min-height: 32px;
  padding-inline: 9px;
  border: 0;
  border-radius: 7px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  font-weight: 800;
  transform: translateY(-50%);
  cursor: pointer;
}
.search-status {
  margin: 4px 2px 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
}
.reference-search:focus {
  box-shadow: 0 0 0 3px rgba(120, 101, 47, 0.16);
}
.workflow-tabs {
  position: sticky;
  top: 47px;
  z-index: 8;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  overflow: visible;
  margin-bottom: 9px;
  padding: 5px 0;
  background: #f6f9f9;
}
.workflow-tabs a {
  flex: 0 0 auto;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--brand-dark);
  background: #fff;
  font-size: 0.72rem;
  font-weight: 850;
  text-decoration: none;
}
.workflow-tabs a.active,
.reference-nav a.active,
#mobileNavigation a.active {
  color: #fff;
  background: var(--brand);
}
.reference-layout {
  display: grid;
  gap: 12px;
}
.reference-nav,
.unit-reference {
  display: none;
}
.formula-section {
  scroll-margin-top: 112px;
}
.formula-section + .formula-section {
  margin-top: 18px;
}
.section-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 7px;
  font-size: 1.08rem;
}
.section-heading span {
  display: grid;
  width: 27px;
  height: 27px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-size: 0.72rem;
}
.formula-grid {
  display: grid;
  gap: 8px;
}
.formula-card {
  scroll-margin-top: 112px;
  padding: 10px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 6px 18px rgba(24, 52, 56, 0.05);
}
.formula-card[hidden] {
  display: none;
}
.formula-card-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}
.formula-number {
  color: var(--brand);
  font-size: 0.65rem;
  font-weight: 850;
}
.formula-card h3 {
  margin: 2px 0 4px;
  font-size: 1rem;
}
.formula-description {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
}
.formula-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  align-content: flex-start;
  justify-content: flex-end;
}
.formula-tag {
  padding: 3px 6px;
  border-radius: 999px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  font-size: 0.56rem;
  font-weight: 850;
  white-space: nowrap;
}
.formula-expression {
  margin: 8px 0;
  padding: 10px;
  overflow-wrap: anywhere;
  border-radius: 10px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  font-size: clamp(0.92rem, 3.5vw, 1.15rem);
  font-weight: 850;
  line-height: 1.35;
  text-align: center;
}
.formula-example {
  margin: 0;
  padding: 8px;
  border-radius: 9px;
  background: var(--surface-alt);
  font-size: 0.76rem;
  white-space: pre-line;
}
.formula-details {
  margin-top: 7px;
  border-top: 1px solid var(--line);
}
.formula-details summary {
  padding: 8px 0 3px;
  color: var(--brand-dark);
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 850;
}
.formula-detail-copy {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.42;
}
.formula-detail-copy p {
  margin: 0;
}
.formula-detail-copy > div {
  display: grid;
  gap: 2px;
}
.formula-detail-copy a {
  color: var(--brand-dark);
  font-weight: 750;
}
.formula-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 8px;
}
.formula-action {
  min-height: 35px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  font-size: 0.68rem;
  font-weight: 850;
  text-decoration: none;
}
.formula-action.primary {
  border-color: var(--brand);
  color: #fff;
  background: var(--brand);
}
.empty-results {
  padding: 30px 10px;
  color: var(--muted);
  text-align: center;
}
.unit-reference {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.unit-reference h2 {
  font-size: 0.9rem;
}
.unit-reference h3 {
  margin: 8px 0 3px;
  color: var(--brand-dark);
  font-size: 0.72rem;
}
.unit-reference p {
  margin: 0;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.55;
}
.reference-disclaimer {
  margin-top: 18px;
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  background: #fff;
  font-size: 0.72rem;
  line-height: 1.5;
}
mark {
  color: inherit;
  background: #ffe675;
}
@media (min-width: 760px) {
  .formula-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .reference-layout {
    grid-template-columns: 170px minmax(0, 1fr);
    align-items: start;
  }
  .reference-nav {
    position: sticky;
    top: 112px;
    display: grid;
    gap: 3px;
  }
  .reference-nav a {
    padding: 6px 8px;
    border-radius: 7px;
    color: var(--muted);
    font-size: 0.7rem;
    font-weight: 800;
    text-decoration: none;
  }
  .reference-nav a:hover {
    color: var(--brand-dark);
    background: var(--brand-soft);
  }
}
@media (min-width: 1120px) {
  .reference-layout {
    grid-template-columns: 170px minmax(0, 1fr) 190px;
  }
  .unit-reference {
    position: sticky;
    top: 112px;
    display: block;
  }
}
/* Narrow-screen containment overrides */
.reference-page {
  width: calc(100% - 16px);
  max-width: 1240px;
  overflow-x: visible;
}
.reference-layout,
.reference-content,
.formula-grid {
  width: 100%;
  min-width: 0;
}
.formula-card,
.formula-expression {
  max-width: 100%;
}
.formula-card {
  overflow: hidden;
}
.formula-expression {
  overflow-x: auto;
  overflow-y: hidden;
}
.reference-disclaimer a {
  overflow-wrap: anywhere;
}
.formula-expression {
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-all;
}
@media (max-width: 759px) {
  .reference-layout,
  .formula-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 374px) {
  body.tool-formula-reference {
    overflow-x: hidden;
  }
  .formula-expression {
    padding-inline: 6px;
    font-size: 0.78rem;
    line-height: 1.4;
  }
  .reference-hero h1 {
    font-size: 1.55rem;
  }
}

/* Semantic formula typography */
.back-to-top {
  position: fixed;
  right: max(14px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 20;
  width: 46px;
  height: 46px;
  border: 1px solid #fff;
  border-radius: 50%;
  color: #fff;
  background: var(--brand);
  box-shadow: 0 8px 24px rgba(48, 42, 21, 0.28);
  font-size: 1.35rem;
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity 0.18s ease,
    transform 0.18s ease,
    visibility 0.18s;
}
.mobile-menu-toggle {
  position: fixed;
  right: max(14px, env(safe-area-inset-right));
  bottom: max(76px, calc(env(safe-area-inset-bottom) + 76px));
  z-index: 22;
  width: 46px;
  height: 46px;
  border: 1px solid #fff;
  border-radius: 50%;
  color: #fff;
  background: var(--brand-dark);
  box-shadow: 0 8px 24px rgba(48, 42, 21, 0.28);
  font-size: 1.15rem;
  cursor: pointer;
}
.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(16, 25, 27, 0.42);
}
.mobile-reference-menu {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 31;
  max-height: min(78vh, 620px);
  padding: 16px 16px max(18px, env(safe-area-inset-bottom));
  overflow-y: auto;
  border-radius: 20px 20px 0 0;
  background: #fff;
  box-shadow: 0 -12px 36px rgba(16, 25, 27, 0.22);
  transform: translateY(105%);
  transition: transform 0.2s ease;
}
.mobile-reference-menu.open {
  transform: translateY(0);
}
.mobile-menu-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.mobile-menu-head h2 {
  margin: 0;
  font-size: 1.05rem;
}
.mobile-menu-head button {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  background: var(--surface-alt);
  font-size: 1.4rem;
  cursor: pointer;
}
#mobileNavigation {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}
#mobileNavigation a {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--brand-dark);
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}
.mobile-unit-reference {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}
.mobile-unit-reference h2 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}
.mobile-unit-reference p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.5;
}
body.mobile-menu-open {
  overflow: hidden;
}
@media (min-width: 760px) {
  .mobile-menu-toggle,
  .mobile-menu-backdrop,
  .mobile-reference-menu {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .back-to-top,
  .mobile-reference-menu {
    scroll-behavior: auto;
    transition: none;
  }
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:focus-visible {
  outline: 3px solid #f0d875;
  outline-offset: 2px;
}
.formula-expression {
  word-break: normal;
}
.formula-variable {
  display: inline-flex;
  align-items: baseline;
  margin-inline: 2px;
  color: #176b87;
  font-family: "Cambria Math", "Times New Roman", serif;
  font-style: italic;
  font-weight: 800;
  white-space: nowrap;
}
.formula-variable sub {
  position: relative;
  bottom: -0.12em;
  margin-left: 1px;
  color: #38545e;
  font-family: "Noto Sans KR", sans-serif;
  font-size: 0.62em;
  font-style: normal;
  font-weight: 800;
  letter-spacing: 0.01em;
}
.formula-operator {
  display: inline-block;
  margin-inline: 0.16em;
  color: #b64e2d;
  font-weight: 900;
}
.formula-paren {
  display: inline-block;
  margin-inline: 0.05em;
  color: #7650a5;
  font-size: 1.08em;
  font-weight: 900;
}
.formula-expression var + span.formula-operator,
.formula-expression span.formula-operator + var {
  margin-left: 0.18em;
  margin-right: 0.18em;
}
@media (max-width: 374px) {
  .formula-variable {
    margin-inline: 1px;
  }
  .formula-operator {
    margin-inline: 0.1em;
  }
  .formula-variable sub {
    font-size: 0.65em;
  }
}