.distance-page {
  --distance-green: #0f9f78;
  --distance-green-dark: #08735a;
  --distance-cyan: #17b9c6;
  --distance-orange: #f59e0b;
}

.distance-page .distance-hero {
  overflow: hidden;
  background:
    radial-gradient(
      circle at 84% 20%,
      rgba(23, 185, 198, 0.18),
      transparent 30%
    ),
    linear-gradient(180deg, #f7fffd 0%, #f8fafc 100%);
}

.distance-formula-card {
  position: relative;
  min-height: 300px;
  padding: clamp(28px, 4vw, 48px);
  overflow: hidden;
  border: 1px solid rgba(15, 159, 120, 0.22);
  border-radius: 28px;
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.96),
    rgba(223, 250, 244, 0.9)
  );
  box-shadow: 0 28px 65px rgba(8, 115, 90, 0.12);
}

.distance-formula-card::after {
  position: absolute;
  right: -65px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  border: 36px solid rgba(23, 185, 198, 0.12);
  border-radius: 50%;
  content: '';
}

.distance-formula-card > span {
  color: #475569;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.distance-formula-card > strong {
  display: block;
  margin: 4px 0 24px;
  color: #0f172a;
  font-size: clamp(2.7rem, 7vw, 5.2rem);
  line-height: 1;
}

.distance-formula-card p {
  position: relative;
  z-index: 1;
  max-width: 420px;
  margin: 20px 0 0;
  color: #475569;
}

.formula-flow {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.formula-flow b {
  padding: 9px 12px;
  border: 1px solid rgba(15, 159, 120, 0.18);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--distance-green-dark);
  font-size: 0.88rem;
}

.formula-flow i {
  color: #64748b;
  font-style: normal;
  font-weight: 900;
}

.distance-tool-section {
  background: #ffffff;
}

.distance-workspace {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(0, 1.22fr);
  gap: 24px;
  align-items: stretch;
}

.distance-controls,
.distance-result-panel {
  border: 1px solid #dce6f5;
  border-radius: 24px;
  background: #ffffff;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.07);
}

.distance-controls {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: clamp(22px, 3.5vw, 34px);
}

.distance-controls fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.distance-controls legend {
  margin-bottom: 14px;
  color: #0f172a;
  font-weight: 850;
}

.scenario-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.scenario-button {
  display: flex;
  flex-direction: column;
  gap: 2px;
  align-items: flex-start;
  min-height: 74px;
  padding: 12px 14px;
  border: 1px solid #d8e4ed;
  border-radius: 13px;
  background: #f8fafc;
  color: #475569;
  cursor: pointer;
  text-align: left;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    transform 160ms ease;
}

.scenario-button strong {
  color: #0f172a;
  font-size: 1rem;
}

.scenario-button:hover,
.scenario-button:focus-visible,
.scenario-button.is-selected {
  border-color: rgba(15, 159, 120, 0.7);
  background: #ecfdf8;
  color: var(--distance-green-dark);
}

.scenario-button:hover {
  transform: translateY(-2px);
}

.speed-control label {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
  color: #0f172a;
  font-weight: 850;
}

.speed-control output {
  color: var(--distance-green-dark);
}

.speed-control input[type='range'] {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  accent-color: var(--distance-green);
  cursor: pointer;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  color: #64748b;
  font-size: 0.75rem;
  font-weight: 700;
}

.speed-control p {
  margin: 10px 0 0;
  color: #64748b;
  font-size: 0.85rem;
  line-height: 1.5;
}

.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
}

.tool-actions .button {
  flex: 1 1 150px;
}

.distance-result-panel {
  --reaction-part: 37.5%;
  --braking-part: 62.5%;
  padding: clamp(22px, 4vw, 40px);
  background: linear-gradient(
    180deg,
    rgba(236, 253, 248, 0.7),
    rgba(255, 255, 255, 0.96)
  );
}

.result-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.result-heading span {
  color: #64748b;
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-heading h3 {
  margin: 0;
  color: var(--distance-green-dark);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.distance-road {
  position: relative;
  display: grid;
  grid-template-columns: var(--reaction-part) var(--braking-part);
  align-items: stretch;
  min-height: 126px;
  margin: 28px 0;
  padding: 28px 48px 24px;
  overflow: hidden;
  border-radius: 20px;
  background:
    linear-gradient(
        90deg,
        transparent 49%,
        rgba(255, 255, 255, 0.65) 50%,
        transparent 51%
      )
      0 56% / 52px 4px repeat-x,
    #273143;
  color: #ffffff;
}

.road-car,
.road-stop {
  position: absolute;
  z-index: 2;
  top: 14px;
  font-size: 1.8rem;
  line-height: 1;
}

.road-car {
  left: 12px;
}

.road-stop {
  right: 11px;
}

.road-segment {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  min-width: 0;
  border-bottom: 8px solid;
}

.road-segment b {
  padding-bottom: 8px;
  font-size: clamp(0.7rem, 2vw, 0.85rem);
}

.road-reaction {
  border-color: var(--distance-cyan);
}

.road-braking {
  border-color: var(--distance-orange);
}

.distance-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.distance-metrics article {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 16px;
  border: 1px solid #dce6f5;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.88);
}

.distance-metrics span {
  min-height: 40px;
  color: #475569;
  font-size: 0.8rem;
  font-weight: 750;
  line-height: 1.35;
}

.distance-metrics strong {
  margin: 6px 0 0;
  color: #0f172a;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1;
}

.distance-metrics small {
  margin-top: 7px;
  color: #64748b;
  font-weight: 700;
}

.distance-metrics .metric-total {
  border-color: rgba(15, 159, 120, 0.28);
  background: #e9fbf5;
}

.distance-metrics .metric-total strong {
  color: var(--distance-green-dark);
}

.distance-disclaimer {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-top: 20px;
  border-color: #fde68a;
  background: #fffbeb;
}

.distance-disclaimer svg {
  flex: 0 0 auto;
  color: #b45309;
}

.distance-disclaimer p {
  margin: 0;
  color: #78350f;
}

.calculation-steps {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  counter-reset: distance-step;
  list-style: none;
}

.calculation-steps li {
  position: relative;
  min-height: 46px;
  padding-left: 58px;
  color: #475569;
  counter-increment: distance-step;
}

.calculation-steps li::before {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 12px;
  background: #e9fbf5;
  color: var(--distance-green-dark);
  content: counter(distance-step);
  font-weight: 900;
}

.calculation-steps strong {
  display: block;
  color: #0f172a;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 840px) {
  .distance-workspace {
    grid-template-columns: 1fr;
  }

  .distance-result-panel {
    order: -1;
  }
}

@media (max-width: 580px) {
  .distance-page h1 {
    overflow-wrap: anywhere;
    font-size: clamp(2.2rem, 11.5vw, 3rem);
  }

  .scenario-list,
  .distance-metrics {
    grid-template-columns: 1fr 1fr;
  }

  .distance-metrics .metric-total {
    grid-column: 1 / -1;
  }

  .distance-road {
    min-height: 112px;
    padding-right: 42px;
    padding-left: 42px;
  }

  .road-segment b {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .distance-page *,
  .distance-page *::before,
  .distance-page *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}