.polygon-page .lesson-content {
  font-size: 1rem;
  line-height: 1.72;
}

.polygon-page .reading-row {
  display: grid;
  grid-template-columns: minmax(150px, 210px) 1fr;
  gap: 1.25rem;
  padding: .9rem 0;
  border-bottom: 1px solid #dbe7f4;
}

.polygon-page .reading-row > strong {
  color: #10234a;
}

.polygon-page .plain-note {
  margin: 1.2rem 0;
  padding: .9rem 1rem;
  background: #f4f8fc;
  border-left: 3px solid #0b67d8;
}

.polygon-page .definition-line {
  margin: 1rem 0 1.35rem;
  padding: .85rem 0 .85rem 1rem;
  border-left: 3px solid #0b67d8;
  color: #253958;
}

.polygon-page .formula-line {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: .55rem;
  margin: 1.25rem 0;
  padding: 1rem;
  border-top: 1px solid #dbe7f4;
  border-bottom: 1px solid #dbe7f4;
  color: #10234a;
  font: 600 1.18rem Georgia, "Times New Roman", serif;
}

.polygon-page .math-frac {
  display: inline-grid;
  grid-template-rows: auto auto;
  vertical-align: middle;
  min-width: 2.4em;
  text-align: center;
  line-height: 1.15;
}

.polygon-page .math-frac > span:first-child {
  padding: 0 .25rem .12rem;
  border-bottom: 1.5px solid currentColor;
}

.polygon-page .math-frac > span:last-child {
  padding: .12rem .25rem 0;
}

.polygon-page .name-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 2.25rem;
}

.polygon-page .name-grid .reading-row {
  grid-template-columns: 72px 1fr;
}

.polygon-page .figure-wrap {
  margin: 1.75rem 0 1rem;
}

.polygon-page .figure-wrap svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 470px;
}

.polygon-page .figure-caption {
  margin-top: .65rem;
  color: #63748e;
  font-size: .86rem;
}

.polygon-page svg .shape {
  fill: none;
  stroke: #0b67d8;
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.polygon-page svg .shape-fill {
  fill: #e8f3ff;
  stroke: #0b67d8;
  stroke-width: 2.2;
  stroke-linejoin: round;
}

.polygon-page svg .concave-fill {
  fill: #fff4da;
  stroke: #d98500;
  stroke-width: 2.2;
  stroke-linejoin: round;
}

.polygon-page svg .complex-line {
  fill: none;
  stroke: #cf3d56;
  stroke-width: 2.3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.polygon-page svg .diagonal,
.polygon-page svg .helper {
  fill: none;
  stroke: #00a48f;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.polygon-page svg .helper {
  stroke-dasharray: 6 5;
}

.polygon-page svg .angle {
  fill: none;
  stroke: #f19a21;
  stroke-width: 2.25;
  stroke-linecap: round;
}

.polygon-page svg .mark {
  fill: none;
  stroke: #10234a;
  stroke-width: 1.7;
  stroke-linecap: round;
}

.polygon-page svg .point {
  fill: #f5a02a;
  stroke: #10234a;
  stroke-width: 1.5;
}

.polygon-page svg text {
  fill: #10234a;
  font: 600 15px Inter, Arial, sans-serif;
}

.polygon-page svg .soft-label {
  fill: #60718b;
  font-size: 13px;
  font-weight: 500;
}

.polygon-page .proof-steps {
  counter-reset: proof;
  margin: 1rem 0 1.4rem;
}

.polygon-page .proof-step {
  position: relative;
  padding: .8rem 0 .8rem 3.1rem;
  border-bottom: 1px solid #dbe7f4;
}

.polygon-page .proof-step::before {
  counter-increment: proof;
  content: counter(proof);
  position: absolute;
  left: .15rem;
  top: .72rem;
  width: 1.85rem;
  height: 1.85rem;
  display: grid;
  place-items: center;
  border: 1px solid #9dc8fa;
  border-radius: 50%;
  color: #0562d4;
  font-weight: 700;
}

.polygon-page .question-group-title {
  margin: 2rem 0 .35rem;
  color: #10234a;
  font-size: 1.13rem;
}

html[data-theme="dark"] .polygon-page .reading-row,
html[data-theme="dark"] .polygon-page .proof-step,
html[data-theme="dark"] .polygon-page .formula-line {
  border-color: #29415d;
}

html[data-theme="dark"] .polygon-page .reading-row > strong,
html[data-theme="dark"] .polygon-page .formula-line,
html[data-theme="dark"] .polygon-page .question-group-title {
  color: #e8f2ff;
}

html[data-theme="dark"] .polygon-page .plain-note {
  background: #10233b;
}

html[data-theme="dark"] .polygon-page .definition-line {
  color: #dbe8f7;
}

html[data-theme="dark"] .polygon-page svg text {
  fill: #e8f2ff;
}

html[data-theme="dark"] .polygon-page svg .soft-label {
  fill: #b9c9dc;
}

html[data-theme="dark"] .polygon-page svg .point {
  stroke: #e8f2ff;
}

html[data-theme="dark"] .polygon-page svg .mark {
  stroke: #e8f2ff;
}

html[data-theme="dark"] .polygon-page svg .shape-fill {
  fill: #142b45;
}

html[data-theme="dark"] .polygon-page svg .concave-fill {
  fill: #3b2d13;
}

@media (max-width: 760px) {
  .polygon-page .reading-row,
  .polygon-page .name-grid .reading-row {
    grid-template-columns: 1fr;
    gap: .3rem;
  }

  .polygon-page .name-grid {
    grid-template-columns: 1fr;
  }
}