:root {
  color-scheme: dark;
  --bg: #000413;
  --panel: rgba(5, 16, 34, 0.78);
  --panel-strong: rgba(5, 16, 34, 0.94);
  --ink: #f1f7f5;
  --muted: #9bb7c4;
  --line: rgba(173, 215, 228, 0.24);
  --accent: #79d8c5;
  --accent-strong: #c5ffe9;
  --wall: #4c84ca;
  --contract: #e65d68;
  --expand: #5aabe8;
  --equilibrium: #68c788;
  --glow: rgba(121, 216, 197, 0.2);
  --font-sans: "Manrope", "Segoe UI", sans-serif;
  --font-mono: "DM Mono", "Consolas", monospace;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #edf3ef;
  --panel: rgba(250, 252, 247, 0.82);
  --panel-strong: rgba(250, 252, 247, 0.96);
  --ink: #183029;
  --muted: #526d65;
  --line: rgba(27, 67, 55, 0.2);
  --accent: #176e61;
  --accent-strong: #0d4d43;
  --wall: #286da8;
  --contract: #a33542;
  --expand: #246d9f;
  --equilibrium: #287b4c;
  --glow: rgba(23, 110, 97, 0.15);
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
}

.experiment-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.experiment-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  width: 100%;
  height: 100svh;
  pointer-events: none;
}

.experiment-header,
.experiment-footer,
.experiment-copy,
.experiment-controls,
.experiment-stats { pointer-events: auto; }

.experiment-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(18px, 4vw, 54px);
  background: linear-gradient(to bottom, rgba(0, 4, 19, 0.68), transparent);
}

html[data-theme="light"] .experiment-header {
  background: linear-gradient(to bottom, rgba(237, 243, 239, 0.82), transparent);
}

.experiment-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  font: 700 11px/1.3 var(--font-mono);
  letter-spacing: 0.12em;
}

.experiment-brand span:first-child {
  display: grid;
  place-items: center;
  width: 33px;
  height: 33px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  color: var(--accent);
  box-shadow: 0 0 22px var(--glow);
}

.experiment-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.experiment-copy {
  align-self: start;
  width: min(470px, calc(100vw - 36px));
  margin: clamp(12px, 4vh, 55px) 0 0 clamp(18px, 4vw, 54px);
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 4px 24px 24px 24px;
  background: var(--panel);
  box-shadow: 0 18px 70px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(14px);
}

.experiment-kicker {
  margin: 0 0 13px;
  color: var(--accent);
  font: 10px/1.5 var(--font-mono);
  letter-spacing: 0.13em;
}

.experiment-copy h1 {
  margin: 0;
  font-size: clamp(38px, 6vw, 70px);
  font-weight: 500;
  line-height: 0.96;
  letter-spacing: -0.055em;
}

.experiment-copy h1 em { color: var(--accent); font-family: Georgia, serif; font-weight: 400; }
.experiment-copy p:not(.experiment-kicker) { margin: 18px 0 0; color: var(--muted); font-size: 14px; line-height: 1.75; }

.experiment-footer {
  display: grid;
  grid-template-columns: minmax(260px, 420px) minmax(0, 1fr) auto;
  align-items: end;
  gap: 16px;
  padding: 0 clamp(18px, 4vw, 54px) 20px;
}

.experiment-controls,
.experiment-stats {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
  backdrop-filter: blur(14px);
}

.experiment-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  padding: 16px;
}

.experiment-controls label { display: grid; gap: 8px; color: var(--muted); font: 10px/1.2 var(--font-mono); letter-spacing: 0.08em; }
.experiment-controls label span { display: flex; justify-content: space-between; gap: 10px; }
.experiment-controls output { color: var(--ink); }
.experiment-controls input { width: 100%; accent-color: var(--accent); }

.experiment-actions { grid-column: 1 / -1; display: flex; gap: 8px; }
.experiment-actions button {
  flex: 1;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font: 10px var(--font-mono);
  letter-spacing: 0.08em;
  cursor: pointer;
}
.experiment-actions button:hover,
.experiment-actions button:focus-visible { border-color: var(--accent); color: var(--accent-strong); background: var(--glow); }

.experiment-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  padding: 14px 17px;
  color: var(--muted);
  font: 10px/1.4 var(--font-mono);
}
.experiment-stats span { white-space: nowrap; }
.experiment-stats b { color: var(--ink); }
.stat-contract b { color: var(--contract); }
.stat-expand b { color: var(--expand); }
.stat-equilibrium b { color: var(--equilibrium); }

.experiment-signoff {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  color: var(--muted);
  font: 9px/1.5 var(--font-mono);
  text-align: right;
}
.experiment-signoff a { color: var(--ink); text-decoration-color: var(--accent); text-underline-offset: 4px; }

.experiment-note {
  margin: 0;
  padding: 9px 14px;
  border-left: 2px solid var(--accent);
  background: var(--panel);
  color: var(--muted);
  font: 10px/1.6 var(--font-mono);
}

.site-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 34px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--ink);
  font: 9px/1 var(--font-mono);
  letter-spacing: 0.08em;
  cursor: pointer;
  backdrop-filter: blur(12px);
}
.site-theme-toggle:hover,
.site-theme-toggle:focus-visible { border-color: var(--accent); background: var(--glow); }

@media (max-width: 820px) {
  body { overflow: auto; }
  .experiment-shell { height: auto; min-height: 100svh; }
  .experiment-copy { margin-top: 12px; padding: 19px; }
  .experiment-copy h1 { font-size: clamp(38px, 11vw, 58px); }
  .experiment-footer { grid-template-columns: 1fr; align-items: stretch; }
  .experiment-stats { order: 2; }
  .experiment-signoff { justify-content: flex-start; text-align: left; }
}

@media (max-width: 520px) {
  .experiment-header { padding: 13px 16px; }
  .experiment-brand { font-size: 9px; }
  .experiment-copy { width: calc(100vw - 32px); margin: 8px 16px 0; }
  .experiment-copy p:not(.experiment-kicker) { font-size: 12px; }
  .experiment-footer { padding: 0 16px 16px; }
  .experiment-controls { grid-template-columns: 1fr; }
  .experiment-actions { grid-column: auto; }
  .experiment-stats { gap: 8px 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}

/* Light mode uses an unmistakably blue field while keeping experiment panels opaque and legible. */
html[data-theme="light"] {
  --bg: #a9dcfa;
  --panel: rgba(255, 254, 248, 0.96);
  --panel-strong: #fffef9;
  --ink: #102d26;
  --muted: #395a51;
  --line: rgba(17, 79, 62, 0.34);
  --accent: #126c5c;
  --accent-strong: #084d41;
  --glow: rgba(18, 108, 92, 0.18);
}
html[data-theme="light"] body {
  background:
    radial-gradient(circle at 72% 12%, rgba(255, 255, 255, 0.78), transparent 29%),
    linear-gradient(180deg, #86c9ef 0%, #b4e3fb 52%, #e4f6ff 100%);
}
html[data-theme="light"] .experiment-copy,
html[data-theme="light"] .experiment-controls,
html[data-theme="light"] .experiment-stats,
html[data-theme="light"] .site-theme-toggle {
  border-color: rgba(17, 79, 62, 0.34);
  box-shadow: 0 18px 48px rgba(23, 67, 91, 0.2), inset 0 0 0 1px rgba(255, 255, 255, 0.82);
}
html[data-theme="light"] .experiment-copy p:not(.experiment-kicker),
html[data-theme="light"] .experiment-controls label,
html[data-theme="light"] .experiment-stats,
html[data-theme="light"] .experiment-signoff,
html[data-theme="light"] .experiment-note {
  color: #294c43;
}
html[data-theme="light"] .experiment-note {
  background: rgba(255, 254, 248, 0.94);
  border-left-color: #126c5c;
}
html[data-theme="light"] .experiment-actions button {
  border-color: rgba(17, 79, 62, 0.36);
  background: rgba(255, 255, 255, 0.72);
}