body.volume-page {
  --accent: #0f766e;
  --accent-dark: #134e4a;
  --accent-soft: #f0fdfa;
  --accent-border: #99f6e4;
  --accent-glow: rgba(20, 184, 166, .22);
}
.principle-grid,
.volume-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.principle-card,
.volume-card {
  padding: 1.3rem;
  border: 1px solid var(--slate-200);
  border-radius: 1rem;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .05);
}
.principle-card h3,
.volume-card h3 {
  margin: 0 0 .45rem;
  color: var(--accent-dark);
}
.principle-card p,
.volume-card p {
  margin: 0;
  color: var(--slate-700);
}
.volume-badge {
  display: inline-flex;
  margin-bottom: .65rem;
  padding: .32rem .62rem;
  border-radius: 999px;
  color: var(--accent-dark);
  background: var(--accent-soft);
  font-size: .86rem;
  font-weight: 800;
}
.calculator {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, .85fr);
  gap: 1.2rem;
  align-items: start;
}
.calculator-fields,
.calculator-result {
  padding: 1.35rem;
  border: 1px solid var(--slate-200);
  border-radius: 1rem;
  background: #fff;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .05);
}
.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem;
}
.field label {
  display: block;
  margin-bottom: .3rem;
  color: var(--slate-700);
  font-size: .9rem;
  font-weight: 800;
}
.field input,
.field select {
  width: 100%;
  min-height: 48px;
  padding: .65rem .75rem;
  border: 1px solid #cbd5e1;
  border-radius: .7rem;
  color: var(--slate-950);
  background: #fff;
  font: inherit;
}
.field input:focus-visible,
.field select:focus-visible {
  outline: 3px solid rgba(20, 184, 166, .3);
  border-color: var(--accent);
}
.result-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .72rem 0;
  border-bottom: 1px solid var(--slate-200);
}
.result-row strong {
  max-width: 62%;
  text-align: right;
}
.result-verdict {
  margin: 1rem 0 0;
  padding: 1rem;
  border-radius: .85rem;
  color: #fff;
  background: var(--accent-dark);
  font-weight: 800;
}
.calculator-note,
.disclaimer {
  margin: .8rem 0 0;
  color: var(--slate-600);
  font-size: .86rem;
}
.case-matrix {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: .8rem;
}
.case-mini {
  padding: 1rem;
  border: 1px solid var(--slate-200);
  border-radius: 1rem;
  background: #fff;
}
.case-mini strong,
.case-mini span {
  display: block;
}
.case-mini strong {
  color: var(--accent-dark);
  font-size: 1.08rem;
}
.case-mini span {
  margin-top: .3rem;
  color: var(--slate-600);
  font-size: .9rem;
}
.source-box {
  margin-top: 1rem;
  padding: 1rem 1.15rem;
  border-left: 5px solid var(--accent);
  border-radius: 0 .9rem .9rem 0;
  color: var(--slate-700);
  background: var(--accent-soft);
}
.source-box a,
.content-links a {
  color: var(--accent);
  font-weight: 800;
}
.content-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .8rem;
  margin-top: 1.25rem;
}
.content-links a {
  padding: .9rem 1rem;
  border: 1px solid var(--accent-border);
  border-radius: .85rem;
  text-decoration: none;
  background: #fff;
}
.content-links a:hover {
  border-color: var(--accent);
}
@media (max-width: 900px) {
  .case-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 800px) {
  .calculator,
  .principle-grid,
  .volume-grid,
  .content-links {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 560px) {
  .field-grid,
  .case-matrix {
    grid-template-columns: 1fr;
  }
  .result-row {
    display: block;
  }
  .result-row strong {
    display: block;
    max-width: none;
    margin-top: .2rem;
    text-align: left;
  }
}