:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #5f5f5f;
  --line: #111111;
  --blue: #2563eb;
  --red: #dc2626;
  --number-font: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px;
}

.layout {
  width: min(1120px, 100%);
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(340px, 460px);
  gap: 56px;
  align-items: start;
}

.panel__title {
  margin: 0 0 12px;
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1.05;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 700;
}

.panel__intro {
  margin: 0 0 28px;
  max-width: 48ch;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.7;
}

.controls {
  margin-bottom: 32px;
}

.controls__label {
  display: block;
  margin-bottom: 12px;
  font-weight: 700;
}

.controls__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 112px;
  gap: 16px;
  align-items: center;
  margin-bottom: 16px;
}

.controls__range,
.controls__number,
.controls__button {
  font: inherit;
}

.controls__number {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: #ffffff;
  font-family: var(--number-font);
}

.controls__button {
  padding: 12px 18px;
  border: 1px solid var(--blue);
  background: var(--blue);
  color: #ffffff;
  cursor: pointer;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 700;
}

.stats {
  display: grid;
  gap: 14px;
}

.stats__line {
  margin: 0;
  display: grid;
  gap: 6px;
}

.stats__label {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.stats__value {
  font-size: 20px;
  line-height: 1.4;
  font-family: var(--number-font);
}

.stats__line--formula .stats__value {
  font-size: 22px;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

.layout__diagram {
  display: flex;
  justify-content: center;
}

.diagram {
  position: relative;
  width: min(460px, 100%);
  aspect-ratio: 1;
  border: 1px solid var(--line);
}

.diagram__svg {
  display: block;
  width: 100%;
  height: 100%;
}

.diagram__curve {
  fill: none;
  stroke: var(--line);
  stroke-width: 0.8;
  vector-effect: non-scaling-stroke;
}

.diagram__point {
  r: 0.7;
}

.diagram__point--inside {
  fill: var(--blue);
}

.diagram__point--outside {
  fill: var(--red);
}

@media (max-width: 820px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}