.geometry-section {
  background: #efe5d7;
}

.geometry-principles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.geometry-principles article {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
  box-shadow: var(--shadow);
}

.geometry-principles strong {
  display: block;
  color: var(--night);
  line-height: 1.2;
}

.geometry-principles span {
  display: block;
  margin-top: 0.35rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.4;
}

.geometry-block {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.geometry-block-heading {
  padding: 1.2rem;
  border-bottom: 1px solid var(--line);
}

.geometry-block-heading h3 {
  font-size: 1.55rem;
}

.geometry-block-heading p {
  max-width: 54rem;
  margin: 0.5rem 0 0;
  color: var(--ink-soft);
}

.seal-grid {
  display: grid;
  gap: 0;
}

.month-seal-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.day-symbol-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.seal-card {
  min-width: 0;
  display: grid;
  grid-template-columns: 7.25rem minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  padding: 1rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.month-seal-grid .seal-card:nth-child(3n),
.day-symbol-grid .seal-card:nth-child(4n) {
  border-right: 0;
}

.seal-art {
  width: 7.25rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 28%, rgba(255, 250, 241, 0.95), rgba(255, 250, 241, 0) 28%),
    radial-gradient(circle at center, #f7f1e8, #d6c2a8);
  border: 1px solid #d8c5aa;
  box-shadow: inset 0 0 20px rgba(28, 26, 23, 0.08);
  overflow: hidden;
}

.seal-art svg {
  display: block;
  width: 100%;
  height: 100%;
}

.seal-copy {
  min-width: 0;
}

.seal-copy h4 {
  margin: 0;
  color: var(--night);
  font-size: 0.98rem;
  line-height: 1.18;
}

.seal-number {
  display: block;
  margin: 0.22rem 0 0.45rem;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.seal-copy p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.87rem;
  line-height: 1.42;
}

.seal-formula {
  display: block;
  margin-top: 0.55rem;
  padding: 0.48rem 0.55rem;
  border-radius: 8px;
  color: var(--night);
  background: #f0e0ca;
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.3;
}

@media (max-width: 1160px) {
  .month-seal-grid,
  .day-symbol-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .month-seal-grid .seal-card:nth-child(3n),
  .day-symbol-grid .seal-card:nth-child(4n) {
    border-right: 1px solid var(--line);
  }

  .month-seal-grid .seal-card:nth-child(2n),
  .day-symbol-grid .seal-card:nth-child(2n) {
    border-right: 0;
  }
}

@media (max-width: 900px) {
  .geometry-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .geometry-principles,
  .month-seal-grid,
  .day-symbol-grid {
    grid-template-columns: 1fr;
  }

  .month-seal-grid .seal-card,
  .day-symbol-grid .seal-card,
  .month-seal-grid .seal-card:nth-child(2n),
  .day-symbol-grid .seal-card:nth-child(2n),
  .month-seal-grid .seal-card:nth-child(3n),
  .day-symbol-grid .seal-card:nth-child(4n) {
    border-right: 0;
  }

  .seal-card {
    grid-template-columns: 5.5rem minmax(0, 1fr);
  }

  .seal-art {
    width: 5.5rem;
  }
}