:root {
  color-scheme: dark;
  --ink: #d7d8d5;
  --muted: #929591;
  --quiet: #686b68;
  --line: rgba(222, 224, 220, 0.2);
  --line-strong: rgba(222, 224, 220, 0.42);
  --panel: rgba(11, 12, 12, 0.94);
  --black: #050606;
  font-family: "IBM Plex Mono", "Nimbus Mono PS", "Courier New", monospace;
  font-synthesis: none;
}

* { box-sizing: border-box; }

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

html,
body {
  width: 100%;
  min-width: 320px;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--black);
}

body {
  color: var(--ink);
  text-rendering: geometricPrecision;
}

button,
a { color: inherit; font: inherit; }
button { border: 0; }
[hidden] { display: none !important; }

#biosphere {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
  background: var(--black);
}

#biosphere:focus-visible {
  outline: 1px solid var(--line-strong);
  outline-offset: -3px;
}

.instrument {
  position: relative;
  z-index: 2;
  width: 100vw;
  height: 100svh;
  min-height: 26rem;
  pointer-events: none;
}

.top-menu {
  position: absolute;
  top: clamp(0.9rem, 2.2vw, 1.8rem);
  left: 50%;
  display: flex;
  gap: clamp(1.5rem, 5vw, 4rem);
  transform: translateX(-50%);
  pointer-events: auto;
}

.top-menu button {
  padding: 0.45rem 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.58rem;
  letter-spacing: 0.24em;
}

.top-menu button:hover,
.top-menu button:focus-visible {
  color: var(--ink);
  outline: none;
  box-shadow: 0 1px 0 var(--ink);
}

.telemetry {
  position: absolute;
  bottom: clamp(0.65rem, 1.6vw, 1.2rem);
  left: clamp(0.75rem, 1.8vw, 1.5rem);
  max-width: calc(100vw - 1.5rem);
  color: var(--quiet);
  pointer-events: none;
}

.telemetry dl {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  margin: 0;
}

.telemetry div { display: flex; gap: 0.32rem; }
.telemetry dt,
.telemetry dd {
  margin: 0;
  font-size: 0.39rem;
  line-height: 1;
  letter-spacing: 0.12em;
  font-variant-numeric: tabular-nums;
}
.telemetry dt { opacity: 0.72; }

.disturb-menu {
  position: fixed;
  z-index: 8;
  display: grid;
  width: 12.5rem;
  gap: 0.1rem;
  padding: 0.45rem;
  border: 1px solid var(--line);
  background: var(--panel);
  pointer-events: auto;
  box-shadow: 0 1.3rem 4rem rgba(0, 0, 0, 0.5);
}

.disturb-menu button {
  width: 100%;
  padding: 0.65rem 0.7rem;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.48rem;
  letter-spacing: 0.14em;
  text-align: left;
}

.disturb-menu button:hover,
.disturb-menu button:focus-visible {
  color: var(--ink);
  outline: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.035);
}

.event-status {
  position: fixed;
  z-index: 8;
  bottom: 2.3rem;
  left: 50%;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  transform: translateX(-50%);
  pointer-events: none;
  font-size: 0.44rem;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.specimen {
  position: fixed;
  z-index: 5;
  top: 50%;
  right: clamp(0.8rem, 2.5vw, 2.5rem);
  width: min(13rem, calc(100vw - 1.6rem));
  padding: 0.85rem;
  border: 1px solid var(--line);
  background: rgba(10, 11, 11, 0.88);
  transform: translateY(-50%);
  box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.28);
}

.specimen header { display: flex; justify-content: flex-end; }
.specimen header button,
.module-close {
  padding: 0.15rem 0.35rem;
  background: transparent;
  color: var(--quiet);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

.specimen header button:hover,
.specimen header button:focus-visible,
.module-close:hover,
.module-close:focus-visible {
  color: var(--ink);
  outline: 1px solid var(--line);
}

.specimen dl { display: grid; gap: 0.32rem; margin: 0.45rem 0 0; }
.specimen dl div { display: flex; justify-content: space-between; gap: 1rem; }
.specimen dt { color: var(--quiet); font-size: 0.44rem; letter-spacing: 0.11em; }
.specimen dd { margin: 0; color: var(--muted); font-size: 0.5rem; font-variant-numeric: tabular-nums; }

.overlay-shade {
  position: fixed;
  z-index: 6;
  inset: 0;
  background: rgba(2, 3, 3, 0.72);
  backdrop-filter: blur(2px) saturate(0.55);
}

.module-overlay {
  position: fixed;
  z-index: 7;
  top: 50%;
  left: 50%;
  width: min(27rem, calc(100vw - 2rem));
  max-height: calc(100svh - 3rem);
  overflow: auto;
  padding: 3.2rem 1.2rem 1.2rem;
  border: 1px solid var(--line-strong);
  background: rgba(8, 9, 9, 0.97);
  transform: translate(-50%, -50%);
  box-shadow: 0 2rem 7rem rgba(0, 0, 0, 0.62);
}

.module-overlay.instrument-view {
  width: min(80rem, calc(100vw - 2rem));
  min-height: min(44rem, calc(100svh - 2rem));
  max-height: calc(100svh - 2rem);
  padding: clamp(3.2rem, 6vh, 4.5rem) clamp(1rem, 4vw, 4rem) clamp(1.2rem, 3vh, 2.5rem);
}

.module-close {
  position: absolute;
  z-index: 2;
  top: 0.9rem;
  right: 0.9rem;
}

.tool-menu { display: grid; }
.tool-menu button,
.link-list a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1rem 0.25rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-align: left;
  text-decoration: none;
}

.tool-menu button:hover,
.tool-menu button:focus-visible,
.link-list a:hover,
.link-list a:focus-visible {
  color: var(--ink);
  outline: none;
  padding-left: 0.55rem;
  padding-right: 0.55rem;
}

.link-list { margin: 0; padding: 0; list-style: none; }
.link-list li + li a { border-top: 0; }

.tool-back {
  position: absolute;
  top: 1rem;
  left: clamp(1rem, 4vw, 4rem);
  padding: 0.25rem 0;
  background: transparent;
  color: var(--quiet);
  cursor: pointer;
  font-size: 0.48rem;
  letter-spacing: 0.14em;
}

.tool-back:hover,
.tool-back:focus-visible { color: var(--ink); outline: none; box-shadow: 0 1px 0 var(--ink); }

.ac-instrument {
  display: grid;
  min-height: min(38rem, calc(100svh - 8rem));
  align-content: space-between;
  gap: clamp(0.8rem, 2vh, 1.5rem);
}

.ac-instrument.circular-rule { width: 100%; }

.phase-toggle {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
}

.phase-toggle button {
  min-width: 3.8rem;
  padding: 0.72rem 1rem;
  background: transparent;
  color: var(--quiet);
  cursor: pointer;
  font-size: 0.65rem;
  font-variant-numeric: tabular-nums;
}

.phase-toggle button + button { border-left: 1px solid var(--line); }
.phase-toggle button[aria-pressed="true"] { background: rgba(255, 255, 255, 0.09); color: var(--ink); }
.phase-toggle button:hover,
.phase-toggle button:focus-visible { color: var(--ink); outline: inset 1px solid var(--line-strong); }

.voltage-control {
  display: grid;
  grid-template-columns: 2.5rem minmax(7.5rem, 10rem) 2.5rem;
  align-items: stretch;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.voltage-control button {
  background: transparent;
  color: var(--quiet);
  cursor: pointer;
  font-size: 1rem;
}
.voltage-control button:hover,
.voltage-control button:focus-visible { color: var(--ink); outline: 1px solid var(--line); }
.voltage-control button:disabled { opacity: 0.18; cursor: default; }
.voltage-control output { display: flex; align-items: baseline; justify-content: center; gap: 0.5rem; padding: 0.45rem; }
.voltage-control output span { font-size: 1.35rem; font-variant-numeric: tabular-nums; }
.voltage-control output small { color: var(--quiet); font-size: 0.42rem; letter-spacing: 0.1em; }

.rule-layout {
  display: grid;
  grid-template-columns: minmax(7rem, 1fr) minmax(20rem, 42rem) minmax(7rem, 1fr);
  align-items: center;
  gap: clamp(1rem, 2.8vw, 3rem);
}

.rule-stage {
  position: relative;
  width: 100%;
  max-width: min(68svh, 42rem);
  aspect-ratio: 1;
  margin: 0 auto;
  isolation: isolate;
}

.rule-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.rule-ring.is-turning { cursor: grabbing; }
.rule-ring:focus-visible { outline: 1px solid var(--ink); outline-offset: 0.28rem; }
.power-ring {
  z-index: 1;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle, transparent 0 72%, rgba(255, 255, 255, 0.025) 72.2% 88%, rgba(255, 255, 255, 0.065) 88.2% 89%, rgba(9, 10, 10, 0.98) 89.2%),
    repeating-conic-gradient(from -1deg, rgba(255, 255, 255, 0.055) 0 1deg, transparent 1deg 4deg),
    #101111;
  box-shadow: inset 0 0 0 0.45rem rgba(255, 255, 255, 0.02), 0 1.3rem 4rem rgba(0, 0, 0, 0.42);
}
.current-ring {
  z-index: 2;
  width: 72%;
  height: 72%;
  background:
    radial-gradient(circle, transparent 0 60%, rgba(255, 255, 255, 0.025) 60.2% 83%, rgba(255, 255, 255, 0.07) 83.2% 84%, rgba(10, 11, 11, 0.99) 84.2%),
    repeating-conic-gradient(from -1deg, rgba(255, 255, 255, 0.052) 0 1deg, transparent 1deg 5deg),
    #0d0e0e;
  box-shadow: 0 0 0 0.32rem rgba(0, 0, 0, 0.72), inset 0 0 0 0.35rem rgba(255, 255, 255, 0.018);
}

.rule-scale {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  transition: transform 55ms linear;
}

.rule-scale i {
  position: absolute;
  top: 0.38rem;
  bottom: 50%;
  left: 50%;
  width: 1px;
  transform: translateX(-50%) rotate(var(--angle));
  transform-origin: 50% 100%;
}

.rule-scale i::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 0.32rem;
  background: var(--quiet);
  content: "";
}
.rule-scale i.medium::before { height: 0.52rem; }
.rule-scale i.major::before { width: 2px; height: 0.8rem; background: var(--ink); }
.rule-scale i span {
  position: absolute;
  top: 0.92rem;
  left: 50%;
  color: var(--muted);
  font-size: clamp(0.36rem, 0.75vw, 0.52rem);
  font-style: normal;
  font-variant-numeric: tabular-nums;
  transform: translateX(-50%);
}

.ring-tag {
  position: absolute;
  left: 50%;
  color: var(--quiet);
  font-size: clamp(0.36rem, 0.7vw, 0.5rem);
  letter-spacing: 0.2em;
  transform: translateX(-50%);
}
.power-ring .ring-tag { bottom: 5.2%; }
.current-ring .ring-tag { bottom: 5.8%; }

.rule-centre {
  position: absolute;
  z-index: 4;
  top: 50%;
  left: 50%;
  display: grid;
  width: 42%;
  height: 42%;
  align-content: center;
  gap: clamp(0.65rem, 1.8vw, 1.2rem);
  padding: clamp(0.7rem, 2vw, 1.5rem);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: radial-gradient(circle at 42% 35%, #171818, #080909 75%);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 0.35rem rgba(0, 0, 0, 0.62), inset 0 0 2.5rem rgba(255, 255, 255, 0.025);
}

.rule-index {
  position: absolute;
  z-index: 5;
  top: -0.45rem;
  left: 50%;
  width: 1px;
  height: 31%;
  background: linear-gradient(var(--ink), rgba(215, 216, 213, 0.14));
  transform: translateX(-50%);
  box-shadow: 0 0 0.42rem rgba(255, 255, 255, 0.3);
  pointer-events: none;
}
.rule-index::before {
  position: absolute;
  top: 0;
  left: 50%;
  border: 0.28rem solid transparent;
  border-top-color: var(--ink);
  transform: translateX(-50%);
  content: "";
}

.rule-readout {
  display: grid;
  min-width: 0;
  justify-items: center;
  gap: 0.4rem;
  padding: clamp(0.85rem, 2vw, 1.35rem) 0.6rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.015);
  font-variant-numeric: tabular-nums;
}
.rule-readout span { color: var(--quiet); font-size: 0.43rem; letter-spacing: 0.18em; }
.rule-readout strong { font-size: clamp(1.25rem, 2.3vw, 2rem); font-weight: 400; letter-spacing: 0.04em; }
.rule-readout small { color: var(--quiet); font-size: 0.5rem; letter-spacing: 0.12em; }

.instrument-formula {
  color: var(--quiet);
  font-size: 0.45rem;
  letter-spacing: 0.12em;
  text-align: center;
}

.scanlines {
  position: fixed;
  z-index: 5;
  inset: 0;
  pointer-events: none;
  opacity: 0.06;
  background: repeating-linear-gradient(to bottom, transparent 0, transparent 3px, rgba(230, 232, 229, 0.1) 4px);
  mix-blend-mode: screen;
}

noscript {
  position: fixed;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  color: var(--muted);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
}

.error-page {
  display: grid;
  min-height: 100svh;
  place-items: center;
  background:
    linear-gradient(rgba(220, 222, 219, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(220, 222, 219, 0.025) 1px, transparent 1px),
    var(--black);
  background-size: 3rem 3rem;
}
.error-page main { width: min(24rem, calc(100% - 2rem)); }
.error-page p { margin: 0 0 0.8rem; color: var(--quiet); font-size: 0.52rem; letter-spacing: 0.18em; }
.error-page .error-code { margin: 0 0 2rem; color: var(--ink); font-size: clamp(1.5rem, 6vw, 3rem); letter-spacing: 0.12em; }
.error-page a { color: var(--muted); font-size: 0.54rem; letter-spacing: 0.14em; text-decoration: none; }
.error-page a:hover,
.error-page a:focus-visible { color: var(--ink); outline: none; box-shadow: 0 1px 0 var(--ink); }

@media (max-width: 48rem) {
  .top-menu { gap: clamp(1rem, 7vw, 2.7rem); }
  .telemetry { right: 0.75rem; }
  .telemetry dl { gap: 0.32rem 0.65rem; }
  .telemetry div:nth-child(n + 4) dt { display: none; }
  .module-overlay.instrument-view { inset: 0.5rem; width: auto; min-height: 0; max-height: none; transform: none; }
  .ac-instrument { min-height: calc(100svh - 7rem); }
  .phase-toggle button { min-width: 3rem; padding-inline: 0.7rem; }
  .voltage-control { grid-template-columns: 2rem minmax(6rem, 8rem) 2rem; }
  .rule-layout { grid-template-columns: minmax(5.4rem, 0.5fr) minmax(18rem, 1.8fr) minmax(5.4rem, 0.5fr); gap: 0.65rem; }
  .rule-readout { padding-inline: 0.2rem; }
}

@media (max-width: 36rem) {
  .module-overlay.instrument-view { overflow-y: auto; }
  .ac-instrument { display: block; min-height: 0; }
  .rule-layout { grid-template: auto auto / 1fr 1fr; gap: 1rem 0.6rem; }
  .rule-stage { grid-column: 1 / -1; grid-row: 1; max-width: 29rem; }
  .rule-readout { grid-row: 2; }
  .rule-centre { width: 46%; height: 46%; padding: 0.65rem; }
  .phase-toggle button { min-width: 2.6rem; padding: 0.55rem 0.5rem; }
  .voltage-control { grid-template-columns: 1.7rem minmax(4.8rem, 6.4rem) 1.7rem; }
  .voltage-control output span { font-size: 1rem; }
  .instrument-formula { margin-top: 2rem; padding-bottom: 1rem; }
  .specimen { top: auto; right: 0.8rem; bottom: 2.2rem; left: 0.8rem; width: auto; transform: none; }
  .specimen dl { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  .scanlines { display: none; }
  .rule-scale { transition: none; }
}