.experiment {
  --lab-accent: #6ee9ff;
  --lab-muted: #9dabb8;
  width: min(840px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  margin: auto;
  padding: clamp(22px, 4vw, 40px);
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid rgba(143, 207, 224, 0.2);
  border-radius: 28px;
  color: #edf5fa;
  background:
    radial-gradient(ellipse at 0 0, rgba(53, 129, 143, 0.15), transparent 55%),
    linear-gradient(145deg, #0b1820, #080f17 70%);
  box-shadow: 0 30px 140px #000a, inset 0 1px 0 #ffffff0a;
  animation: experiment-arrive 360ms cubic-bezier(0.2, 1, 0.22, 1);
}

.experiment::backdrop { background: rgba(0, 4, 9, 0.76); }
.experiment button, .experiment input { font: inherit; }
.experiment button { cursor: pointer; color: inherit; }
.experiment :focus-visible { outline: 2px solid var(--lab-accent); outline-offset: 4px; }
.experiment-header { position: sticky; top: 0; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 16px; background: #0b1720; border-radius: 12px; }
.experiment-eyebrow { font-size: 12px; letter-spacing: 0.2em; color: var(--lab-accent); }
.experiment-eyebrow span { margin-inline: 12px; opacity: 0.35; }
.experiment-close {
  flex: 0 0 44px;
  height: 44px;
  border: 1px solid #ffffff16;
  border-radius: 50%;
  background: #ffffff06;
  font-size: 26px !important;
  font-weight: 500;
}
.experiment h1 { margin-top: 16px; font-size: clamp(26px, 4vw, 40px); line-height: 1.12; letter-spacing: -0.04em; }
.experiment-description { max-width: 57ch; margin-top: 12px; font-size: 15px; line-height: 1.6; color: var(--lab-muted); }
.experiment-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
.experiment-stats > div { min-width: 0; }
.experiment-stats span { display: block; color: var(--lab-muted); font-size: 12px; margin-bottom: 9px; }
.experiment-stats output { display: block; font-size: clamp(19px, 2.8vw, 29px); letter-spacing: -0.05em; font-variant-numeric: tabular-nums; }
.experiment-stats small { font-size: 0.55em; letter-spacing: 0; }
.experiment-invariant output { color: var(--lab-accent); }
.experiment-stats--light { grid-template-columns: 1.2fr 1fr; }
.experiment-stats--light output { font-size: clamp(20px, 2.7vw, 28px); }
.experiment-diagram {
  width: 100%;
  display: block;
  margin: 16px 0;
  overflow: hidden;
  border-block: 1px solid #b4d7e00c;
  background-image: linear-gradient(#8fcfde06 1px, transparent 1px), linear-gradient(90deg, #8fcfde06 1px, transparent 1px);
  background-size: 32px 32px;
}
.diagram-guide { fill: none; stroke: #829ba64d; stroke-width: 1; stroke-dasharray: 3 7; }
.diagram-trail { fill: none; stroke: var(--lab-accent); stroke-width: 3; stroke-linecap: round; }
.diagram-wheel { fill: #6ee9ff06; stroke: var(--lab-accent); stroke-width: 2; }
.diagram-diameter { stroke: #eaf3fa; stroke-width: 1; }
.diagram-spoke { stroke: #ffcf8d80; stroke-width: 1; stroke-dasharray: 3 4; }
.diagram-point, .diagram-photon { fill: #ffdc9e; filter: drop-shadow(0 0 7px #ffc776); }
.diagram-center { fill: #eef5fa; }
.diagram-tick { fill: none; stroke: #a7c5d2; stroke-width: 1; }
.diagram-caption { fill: var(--lab-muted); font-family: inherit; font-size: 17px; font-variant-numeric: tabular-nums; }
.diagram-light-trail { fill: none; stroke-width: 3; }
.diagram-source { fill: var(--lab-accent); filter: drop-shadow(0 0 10px #6ee9ff66); }
.diagram-receiver { fill: #111d25; stroke: #829ba6; stroke-width: 1.5; }
.diagram-wave { fill: none; stroke: var(--lab-accent); stroke-width: 1; }
.experiment-control { display: grid; grid-template-columns: 1fr auto; gap: 4px 20px; align-items: center; margin-top: 12px; font-size: 14px; }
.experiment-control output { font-variant-numeric: tabular-nums; color: var(--lab-accent); }
.experiment-control input[type="range"] { grid-column: 1 / -1; width: 100%; min-width: 0; height: 36px; accent-color: var(--lab-accent); cursor: pointer; }
.experiment-control input[type="number"] { width: 120px; min-height: 38px; border: 1px solid #829ba64d; border-radius: 8px; background: #ffffff06; color: var(--lab-accent); text-align: right; padding: 6px 10px; font-size: 16px; font-variant-numeric: tabular-nums; }
.experiment-presets { display: flex; flex-wrap: wrap; gap: 8px; }
.experiment-presets button { flex: 1; min-height: 40px; border: 1px solid #829ba630; border-radius: 9px; background: transparent; font-size: 13px; }
.experiment-presets [aria-pressed="true"] { border-color: #6ee9ff77; background: #6ee9ff0a; color: var(--lab-accent); }
.experiment-footer { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: 24px; }
.experiment-play { min-height: 46px; padding: 10px 20px; border: 1px solid #6ee9ff66; border-radius: 12px; background: #6ee9ff12; font-size: 14px; }
.experiment-play:hover, .experiment-close:hover { background: #6ee9ff20; }
.experiment-equation { font-size: clamp(19px, 3vw, 26px); color: var(--lab-accent); white-space: nowrap; }
.experiment-note { margin-top: 18px; color: var(--lab-muted); font-size: 12px; line-height: 1.65; min-height: 2lh; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
@keyframes experiment-arrive { from { opacity: 0; transform: translateY(14px) scale(0.985); } to { opacity: 1; transform: none; } }
@media (max-width: 540px) {
  .experiment { width: calc(100vw - 20px); max-height: calc(100dvh - 20px); padding: 22px 18px; border-radius: 22px; }
  .experiment-stats { gap: 12px 8px; }
  .experiment-stats:not(.experiment-stats--light) { grid-template-columns: 1fr 1fr; }
  .experiment-stats:not(.experiment-stats--light) .experiment-invariant { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
  .experiment-stats span { font-size: 10px; }
  .experiment-stats output { font-size: 19px; }
  .experiment-stats--light { grid-template-columns: 1fr; }
  .experiment-stats--light output { font-size: 27px; }
  .experiment-diagram { width: calc(100% + 20px); max-width: none; margin-inline: -10px; }
  .experiment-description { font-size: 14px; }
  .experiment-note { font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) { .experiment { animation: none; } }