:root {
  color-scheme: light dark;
  --ink: #111820;
  --muted: #4e5c68;
  --faint: #6a7883;
  --surface: rgba(236, 242, 245, 0.88);
  --surface-strong: rgba(246, 249, 250, 0.95);
  --line: rgba(19, 28, 36, 0.16);
  --accent: #b5472c;
  --accent-bright: #dc6847;
  --accent-ink: #fff8f4;
  --canvas: #080b10;
  --radius: 14px;
  --font-sans: "Avenir Next", Avenir, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #ecf1f3;
    --muted: #a4b0b8;
    --faint: #75818b;
    --surface: rgba(12, 17, 23, 0.79);
    --surface-strong: rgba(15, 21, 28, 0.94);
    --line: rgba(218, 231, 238, 0.14);
    --accent: #d45b3b;
    --accent-bright: #f07958;
    --accent-ink: #fff9f5;
  }
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  min-width: 320px;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--canvas);
  font-family: var(--font-sans);
  color: var(--ink);
}

button,
input { font: inherit; }

button { color: inherit; }

button,
[tabindex="0"] { -webkit-tap-highlight-color: transparent; }

button:focus-visible,
input:focus-visible,
.viewport:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  border-radius: 9px;
  background: var(--surface-strong);
  color: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.app-shell {
  position: relative;
  width: 100vw;
  min-height: 100dvh;
  isolation: isolate;
  background:
    radial-gradient(circle at 70% 25%, rgba(34, 46, 56, 0.26), transparent 36%),
    var(--canvas);
}

.viewport,
.viewport canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.viewport { cursor: grab; }
.viewport:active { cursor: grabbing; }

.vignette {
  position: fixed;
  z-index: 2;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(2, 4, 7, 0.52), transparent 22%, transparent 80%, rgba(2, 4, 7, 0.28)),
    linear-gradient(0deg, rgba(2, 4, 7, 0.54), transparent 28%);
}

.hud-surface {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 18px 60px rgba(0, 0, 0, 0.16);
  backdrop-filter: blur(18px) saturate(120%);
  -webkit-backdrop-filter: blur(18px) saturate(120%);
}

.topbar {
  position: fixed;
  z-index: 10;
  top: 18px;
  left: 18px;
  right: 18px;
  min-height: 64px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 10px 12px 10px 16px;
}

.brand-block,
.object-heading,
.runtime-block,
.dialog-heading,
.control-label-row {
  display: flex;
  align-items: center;
}

.brand-block { gap: 11px; }

.brand-mark {
  width: 24px;
  height: 24px;
  border: 1px solid var(--accent-bright);
  border-radius: 50%;
  box-shadow: inset 5px -2px 0 rgba(181, 71, 44, 0.28);
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: -5px 7px;
  border: 1px solid var(--accent-bright);
  border-radius: 50%;
  transform: rotate(56deg);
}

p, h1, h2, dl, dd { margin: 0; }

.brand {
  color: var(--ink);
  font-size: 14px;
  font-weight: 720;
  letter-spacing: -0.01em;
}

.descriptor,
.meta-label {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.4;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.epoch-block { text-align: center; }

#sim-date {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.runtime-block {
  justify-self: end;
  gap: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.runtime-block small { color: var(--faint); font-size: 8px; }

.text-button,
.focus-button,
.play-button,
.body-button {
  border: 1px solid var(--line);
  border-radius: 9px;
  cursor: pointer;
  transition: border-color 180ms ease, background-color 180ms ease, color 180ms ease, transform 120ms ease;
}

.text-button:active,
.focus-button:active,
.play-button:active,
.body-button:active { transform: translateY(1px); }

.text-button {
  min-height: 34px;
  padding: 7px 11px;
  background: transparent;
  color: var(--muted);
  font-size: 10px;
}

.text-button:hover { border-color: var(--accent); color: var(--ink); }

.object-panel {
  position: fixed;
  z-index: 8;
  top: 102px;
  left: 18px;
  width: min(288px, calc(100vw - 36px));
  padding: 17px;
}

.object-heading { gap: 11px; }

.object-swatch {
  width: 27px;
  height: 27px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: #4f88b7;
  box-shadow: inset -8px -4px 10px rgba(0, 0, 0, 0.36);
}

.object-panel h1 {
  margin-top: 2px;
  font-size: 23px;
  line-height: 1;
  font-weight: 620;
  letter-spacing: -0.04em;
}

.object-description {
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.object-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  margin-top: 16px;
}

.object-stats div { min-width: 0; }
.object-stats dt { color: var(--faint); font-size: 9px; }
.object-stats dd {
  margin-top: 4px;
  overflow: hidden;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.focus-button,
.play-button {
  min-height: 39px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 11px;
  font-weight: 650;
}

.focus-button {
  width: 100%;
  margin-top: 17px;
}

.focus-button:hover,
.play-button:hover { background: var(--accent-bright); }

.body-rail {
  position: fixed;
  z-index: 8;
  top: 102px;
  right: 18px;
  width: 146px;
  padding: 13px;
}

.body-list {
  display: grid;
  gap: 4px;
  margin-top: 9px;
}

.body-button {
  display: grid;
  grid-template-columns: 12px 1fr auto;
  gap: 7px;
  align-items: center;
  min-height: 28px;
  padding: 4px 7px;
  border-color: transparent;
  background: transparent;
  text-align: left;
  font-size: 10px;
}

.body-button:hover { border-color: var(--line); background: rgba(127, 142, 151, 0.09); }
.body-button[aria-current="true"] { border-color: rgba(212, 91, 59, 0.38); background: rgba(212, 91, 59, 0.11); }

.body-dot { width: 7px; height: 7px; border-radius: 50%; box-shadow: inset -2px -1px 2px rgba(0, 0, 0, 0.35); }
.body-key { color: var(--faint); font-family: var(--font-mono); font-size: 8px; }

.control-deck {
  position: fixed;
  z-index: 9;
  right: 18px;
  bottom: 18px;
  left: 18px;
  min-height: 76px;
  display: grid;
  grid-template-columns: 100px minmax(240px, 520px) 100px;
  justify-content: center;
  align-items: center;
  gap: 20px;
  padding: 12px 18px;
}

.play-button { width: 100px; }
.speed-control { width: 100%; }
.control-label-row { justify-content: space-between; margin-bottom: 7px; font-size: 10px; }
.control-label-row label { color: var(--muted); }
.control-label-row output { color: var(--ink); font-family: var(--font-mono); font-size: 10px; font-variant-numeric: tabular-nums; }

input[type="range"] {
  width: 100%;
  height: 14px;
  margin: 0;
  cursor: pointer;
  accent-color: var(--accent);
}

.range-scale {
  display: flex;
  justify-content: space-between;
  margin-top: 1px;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 8px;
}

.reset-button { width: 100px; }

.model-note {
  position: fixed;
  z-index: 8;
  bottom: 106px;
  left: 18px;
  display: flex;
  gap: 0;
  overflow: hidden;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 8px;
}

.model-note span { padding: 8px 10px; }
.model-note span + span { border-left: 1px solid var(--line); }

.labels {
  position: absolute;
  z-index: 3;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.space-label {
  position: absolute;
  top: 0;
  left: 0;
  padding: 3px 5px;
  border-radius: 5px;
  background: rgba(6, 9, 13, 0.56);
  color: rgba(236, 241, 243, 0.74);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.04em;
  transform: translate(-50%, -50%);
  will-change: transform;
}

.space-label.is-selected { background: var(--accent); color: var(--accent-ink); }

.loading-state,
.error-state {
  position: fixed;
  z-index: 30;
  top: 50%;
  left: 50%;
  width: min(310px, calc(100vw - 40px));
  padding: 20px;
  text-align: center;
  transform: translate(-50%, -50%);
}

.loading-state p { color: var(--muted); font-size: 11px; }

.loading-line {
  display: block;
  width: 100%;
  height: 2px;
  margin-bottom: 13px;
  overflow: hidden;
  background: var(--line);
}

.loading-line::after {
  content: "";
  display: block;
  width: 42%;
  height: 100%;
  background: var(--accent-bright);
  animation: load 1.4s ease-in-out infinite alternate;
}

@keyframes load { to { transform: translateX(140%); } }

.error-state h2 { margin-top: 5px; font-size: 20px; }
.error-state p:last-child { margin-top: 9px; color: var(--muted); font-size: 12px; line-height: 1.5; }

.help-dialog {
  width: min(470px, calc(100vw - 32px));
  padding: 20px;
  color: var(--ink);
}

.help-dialog::backdrop { background: rgba(2, 4, 7, 0.7); backdrop-filter: blur(4px); }
.dialog-heading { justify-content: space-between; gap: 20px; }
.dialog-heading h2 { margin-top: 3px; font-size: 22px; letter-spacing: -0.03em; }

.key-list { margin-top: 18px; }
.key-list div { display: grid; grid-template-columns: 110px 1fr; align-items: center; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.key-list dt { color: var(--ink); }
.key-list dd { color: var(--muted); font-size: 12px; }
kbd { display: inline-block; min-width: 25px; padding: 4px 6px; border: 1px solid var(--line); border-radius: 6px; background: rgba(127, 142, 151, 0.1); font-family: var(--font-mono); font-size: 9px; text-align: center; }
.dialog-note { margin-top: 17px; color: var(--muted); font-size: 11px; line-height: 1.5; }

.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;
}

.noscript {
  position: fixed;
  z-index: 90;
  inset: 20px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--ink);
}

@media (max-width: 760px) {
  .topbar { top: 10px; left: 10px; right: 10px; min-height: 58px; grid-template-columns: 1fr auto; padding-left: 12px; }
  .descriptor, .epoch-block { display: none; }
  .object-panel { top: 78px; left: 10px; width: 206px; padding: 12px; }
  .object-panel h1 { font-size: 18px; }
  .object-description, .object-stats, .focus-button { display: none; }
  .body-rail { top: 78px; right: 10px; width: 100px; padding: 9px; }
  .body-button { grid-template-columns: 9px 1fr; padding: 3px 5px; font-size: 9px; }
  .body-key, .body-rail > .meta-label { display: none; }
  .body-list { margin-top: 0; }
  .control-deck { right: 10px; bottom: 10px; left: 10px; min-height: 126px; grid-template-columns: 1fr 1fr; gap: 8px 10px; padding: 12px; }
  .speed-control { grid-column: 1 / -1; grid-row: 1; }
  .play-button, .reset-button { width: 100%; }
  .model-note { display: none; }
  .vignette { background: linear-gradient(0deg, rgba(2, 4, 7, 0.62), transparent 36%); }
  .space-label { font-size: 7px; }
}

@media (max-width: 430px) {
  .object-panel { width: 145px; }
  .object-swatch { width: 21px; height: 21px; }
  .body-rail { width: 92px; }
  .runtime-block > div { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .hud-surface { background: var(--surface-strong); backdrop-filter: none; -webkit-backdrop-filter: none; }
}