:root {
  color-scheme: dark;
  --night: #071522;
  --night-deep: #030b12;
  --night-raised: #0d1e2a;
  --iron: #191817;
  --oak: #8b4d24;
  --hemp: #b58a56;
  --parchment: #e7d9ba;
  --muted: #b9ad9b;
  --oxblood: #7a3028;
  --line: rgba(231, 217, 186, 0.28);
  --line-strong: rgba(231, 217, 186, 0.58);
  --surface: rgba(7, 21, 34, 0.88);
  --error: #d6947e;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 3rem;
  --space-4xl: 4rem;
  --space-5xl: 5rem;
  --space-7xl: 7rem;
  --ease-out: cubic-bezier(0.25, 1, 0.5, 1);
  --font-display: "Palatino Linotype", "Book Antiqua", Georgia, "Noto Serif TC", "Microsoft JhengHei", serif;
  --font-body: "Microsoft JhengHei", "PingFang TC", system-ui, sans-serif;
  --font-mono: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 0;
  background: var(--night-deep);
  scroll-behavior: smooth;
}

body {
  min-width: 0;
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
  background: var(--night-deep);
  color: var(--parchment);
  font-family: var(--font-body);
  font-size: 1rem;
  font-kerning: normal;
  line-height: 1.65;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

button:focus {
  outline: none;
}

button:focus-visible,
a:focus-visible,
dialog:focus-visible {
  outline: 2px solid var(--hemp);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: var(--space-lg);
  left: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  transform: translateY(-200%);
  background: var(--parchment);
  color: var(--night);
  text-decoration: none;
}

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

.field-lab {
  position: relative;
  height: 100svh;
  min-height: 0;
  overflow: hidden;
  isolation: isolate;
  background: var(--night);
}

.viewer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 52% 42%, rgba(38, 57, 63, 0.32), transparent 42%),
    var(--night);
}

.viewer::before,
.viewer::after {
  position: absolute;
  z-index: 2;
  inset: 0;
  pointer-events: none;
  content: "";
}

.viewer::before {
  background:
    linear-gradient(90deg, rgba(3, 11, 18, 0.62), transparent 26%, transparent 73%, rgba(3, 11, 18, 0.48)),
    linear-gradient(0deg, rgba(3, 11, 18, 0.84), transparent 25%, transparent 78%, rgba(3, 11, 18, 0.52));
}

.viewer::after {
  opacity: 0.16;
  background-image: repeating-linear-gradient(0deg, transparent, transparent 3px, rgba(231, 217, 186, 0.08) 4px);
  mix-blend-mode: soft-light;
}

#scene-canvas {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}

#scene-canvas:active {
  cursor: grabbing;
}

.identity {
  position: absolute;
  z-index: 12;
  top: max(var(--space-xl), env(safe-area-inset-top));
  left: max(var(--space-2xl), env(safe-area-inset-left));
  width: min(36rem, calc(100vw - 10rem));
  pointer-events: none;
}

.identity > * {
  text-shadow: 0 1px 2px var(--night-deep), 0 0 12px var(--night-deep);
}

.home-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  gap: var(--space-md);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  pointer-events: auto;
  transition: color 180ms ease;
}

.home-link span:first-child {
  color: var(--hemp);
  font-size: 1.25rem;
}

.home-link:hover {
  color: var(--parchment);
}

.identity-kicker {
  margin: var(--space-lg) 0 var(--space-sm);
  color: var(--hemp);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.identity h1 {
  margin: 0;
  max-width: 14ch;
  color: var(--parchment);
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 4.2vw, 4.5rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 0.92;
  text-wrap: balance;
}

.identity h1 span {
  color: var(--hemp);
  font-style: italic;
}

.identity-subtitle {
  display: inline-block;
  margin: var(--space-md) 0 0 calc(var(--space-xs) * -1);
  padding: var(--space-xs);
  background: rgba(7, 21, 34, 0.9);
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.spec-sheet {
  position: absolute;
  z-index: 9;
  bottom: calc(var(--space-3xl) + 5.5rem);
  left: max(var(--space-2xl), env(safe-area-inset-left));
  width: 18rem;
  color: var(--muted);
}

.spec-heading,
.section-kicker,
.dialog-head p,
.dialog-label {
  margin: 0 0 var(--space-md);
  color: var(--hemp);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.spec-sheet dl {
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.spec-sheet dl div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xl);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--line);
}

.spec-sheet dt,
.spec-sheet dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.spec-sheet dd {
  color: var(--parchment);
  font-variant-numeric: tabular-nums;
}

.spec-note {
  margin: var(--space-md) 0 0;
  max-width: 34ch;
  font-size: 0.875rem;
  line-height: 1.55;
}

kbd {
  padding: 0.08em 0.32em;
  border: 1px solid var(--line);
  background: var(--night-raised);
  color: var(--parchment);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.view-rail {
  position: absolute;
  z-index: 10;
  top: 50%;
  right: max(var(--space-2xl), env(safe-area-inset-right));
  display: flex;
  width: 6.75rem;
  transform: translateY(-50%);
  flex-direction: column;
}

.view-rail > span {
  padding: 0 0 var(--space-md);
  color: var(--hemp);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-align: right;
}

.view-button {
  display: grid;
  min-height: 3rem;
  padding: 0;
  border: 0;
  border-top: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  grid-template-columns: 1fr auto;
  align-items: center;
  cursor: pointer;
  font-size: 0.875rem;
  text-align: right;
  transition: color 160ms ease, background-color 160ms ease;
}

.view-button:last-child {
  border-bottom: 1px solid var(--line);
}

.view-button b {
  color: var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  text-align: left;
}

.view-button:hover,
.view-button.is-active {
  background: rgba(181, 138, 86, 0.1);
  color: var(--parchment);
}

.view-button.is-active b::before {
  margin-right: var(--space-xs);
  color: var(--hemp);
  content: "[";
}

.view-button.is-active b::after {
  color: var(--hemp);
  content: "]";
}

.tool-rail {
  position: absolute;
  z-index: 15;
  bottom: max(var(--space-xl), env(safe-area-inset-bottom));
  left: 50%;
  display: flex;
  min-height: 3.5rem;
  transform: translateX(-50%);
  border: 1px solid var(--line-strong);
  background: rgba(25, 24, 23, 0.9);
  box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.24);
}

.tool-rail::before,
.tool-rail::after {
  position: absolute;
  top: 50%;
  width: var(--space-sm);
  height: var(--space-sm);
  transform: translateY(-50%);
  border: 1px solid var(--line-strong);
  background: var(--iron);
  content: "";
}

.tool-rail::before {
  left: calc(var(--space-sm) * -1 - 1px);
}

.tool-rail::after {
  right: calc(var(--space-sm) * -1 - 1px);
}

.tool-button {
  display: flex;
  min-width: 5.25rem;
  min-height: 3.5rem;
  padding: var(--space-sm) var(--space-md);
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  line-height: 1.1;
  transition: background-color 160ms ease, color 160ms ease;
}

.tool-button:last-child {
  border-right: 0;
}

.tool-button span {
  color: var(--hemp);
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
}

.tool-button b {
  margin-top: var(--space-xs);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.tool-button:hover:not(:disabled),
.tool-button[aria-pressed="true"] {
  background: rgba(181, 138, 86, 0.14);
  color: var(--parchment);
}

.tool-button:active:not(:disabled) {
  background: rgba(181, 138, 86, 0.22);
}

.tool-button:disabled {
  cursor: wait;
  opacity: 0.42;
}

.mobile-tool {
  display: none;
}

.load-status {
  position: absolute;
  z-index: 9;
  right: max(var(--space-2xl), env(safe-area-inset-right));
  bottom: calc(var(--space-3xl) + 5rem);
  margin: 0;
  padding: var(--space-xs) var(--space-sm);
  background: rgba(7, 21, 34, 0.86);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}

.loading-state,
.error-state {
  position: absolute;
  z-index: 20;
  top: 50%;
  left: 50%;
  width: min(24rem, calc(100% - var(--space-3xl)));
  transform: translate(-50%, -50%);
  text-align: center;
}

.loading-state.is-complete {
  pointer-events: none;
  animation: loading-away 420ms var(--ease-out) forwards;
}

.loading-mark {
  display: flex;
  width: 5rem;
  height: 2rem;
  margin: 0 auto var(--space-xl);
  align-items: end;
  justify-content: center;
  gap: var(--space-sm);
}

.loading-mark span {
  width: 1px;
  height: 100%;
  transform-origin: bottom;
  background: var(--hemp);
  animation: loading-bars 900ms ease-in-out infinite alternate;
}

.loading-mark span:nth-child(2) {
  height: 70%;
  animation-delay: 140ms;
}

.loading-mark span:nth-child(3) {
  height: 42%;
  animation-delay: 280ms;
}

.loading-label {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.loading-detail {
  margin: var(--space-sm) 0 var(--space-lg);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.loading-track {
  height: 1px;
  overflow: hidden;
  background: var(--line);
}

.loading-track span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--hemp);
  transition: transform 160ms ease;
}

.error-state {
  padding: var(--space-2xl);
  border: 1px solid var(--line-strong);
  background: var(--surface);
}

.error-code {
  margin: 0;
  color: var(--error);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.error-state h2 {
  margin: var(--space-sm) 0;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
}

.error-state p:not(.error-code) {
  margin: 0 0 var(--space-xl);
  color: var(--muted);
}

.error-state button,
.dialog-close,
.dialog-grid button,
.dialog-parts button {
  min-height: 2.75rem;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--parchment);
  cursor: pointer;
}

.error-state button {
  padding: var(--space-sm) var(--space-xl);
}

.error-state button:hover,
.dialog-grid button:hover,
.dialog-parts button:hover {
  background: rgba(181, 138, 86, 0.14);
}

.touch-hint {
  position: absolute;
  z-index: 14;
  bottom: 6.75rem;
  left: 50%;
  display: none;
  padding: var(--space-sm) var(--space-lg);
  transform: translateX(-50%);
  border: 1px solid var(--line);
  background: rgba(7, 21, 34, 0.86);
  color: var(--muted);
  font-size: 0.875rem;
  white-space: nowrap;
}

.touch-hint.is-visible {
  animation: hint-lifetime 2.8s var(--ease-out) forwards;
}

.annotations {
  position: absolute;
  z-index: 11;
  inset: 0;
  pointer-events: none;
}

.annotations svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.annotations line {
  stroke: var(--hemp);
  stroke-width: 1;
  stroke-dasharray: 2 4;
  vector-effect: non-scaling-stroke;
}

.annotation {
  position: absolute;
  display: grid;
  min-width: 9.5rem;
  min-height: 3.25rem;
  padding: var(--space-sm) var(--space-md);
  border: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
  background: rgba(7, 21, 34, 0.9);
  color: var(--parchment);
  pointer-events: auto;
  grid-template-columns: auto 1fr;
  column-gap: var(--space-sm);
  cursor: pointer;
  text-align: left;
}

.annotation > span {
  color: var(--hemp);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  grid-row: 1 / span 2;
}

.annotation strong {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
}

.annotation small {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  line-height: 1.2;
}

.annotation:hover,
.annotation.is-active {
  border-color: var(--hemp);
  background: var(--night-raised);
}

.annotation--left {
  left: clamp(1.5rem, 8vw, 8rem);
}

.annotation--right {
  right: clamp(1.5rem, 10vw, 10rem);
}

.annotation--one {
  top: 34%;
}

.annotation--two {
  top: 23%;
}

.annotation--three {
  top: 45%;
}

.annotation--four {
  top: 55%;
}

.annotation--five {
  top: 68%;
}

.archive-note {
  display: grid;
  width: min(80rem, calc(100% - var(--space-3xl)));
  margin: 0 auto;
  padding: clamp(var(--space-4xl), 8vw, var(--space-7xl)) 0;
  color: var(--muted);
  grid-template-columns: 7rem minmax(0, 1fr) minmax(15rem, 22rem);
  gap: clamp(var(--space-2xl), 5vw, var(--space-5xl));
  align-items: start;
}

.archive-index {
  border-top: 1px solid var(--line-strong);
  padding-top: var(--space-md);
  color: var(--hemp);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1.35;
}

.archive-copy h2 {
  margin: 0 0 var(--space-xl);
  max-width: 20ch;
  color: var(--parchment);
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.8vw, 3.5rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.15;
  text-wrap: balance;
}

.archive-copy p:not(.section-kicker) {
  max-width: 68ch;
  margin: 0 0 var(--space-xl);
}

.archive-facts {
  margin: var(--space-2xl) 0 0;
  border-top: 1px solid var(--line-strong);
}

.archive-facts div {
  display: grid;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--line);
  grid-template-columns: 2rem 1fr;
  gap: var(--space-md);
}

.archive-facts dt,
.archive-facts dd {
  margin: 0;
}

.archive-facts dt {
  color: var(--hemp);
  font-family: var(--font-mono);
}

.archive-facts dd {
  font-size: 0.875rem;
}

dialog {
  width: min(34rem, calc(100% - var(--space-xl)));
  max-height: calc(100svh - var(--space-xl));
  margin: auto;
  padding: 0;
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: #0d1e2a;
  color: var(--parchment);
  box-shadow: 0 2rem 6rem rgba(0, 0, 0, 0.48);
}

dialog::backdrop {
  background: rgba(3, 11, 18, 0.72);
  backdrop-filter: blur(4px);
}

.dialog-head {
  display: flex;
  padding: var(--space-xl);
  border-bottom: 1px solid var(--line);
  align-items: start;
  justify-content: space-between;
  gap: var(--space-xl);
}

.dialog-head p {
  margin-bottom: var(--space-xs);
}

.dialog-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
}

.dialog-close {
  width: 2.75rem;
  min-width: 2.75rem;
  padding: 0;
  font-size: 1.5rem;
}

.dialog-section {
  padding: var(--space-xl);
  border-bottom: 1px solid var(--line);
}

.dialog-section:last-child {
  border-bottom: 0;
}

.dialog-grid,
.dialog-parts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
}

.dialog-grid button,
.dialog-parts button {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
}

.dialog-grid button span {
  margin-right: var(--space-md);
  color: var(--hemp);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

@keyframes loading-bars {
  from { transform: scaleY(0.35); opacity: 0.42; }
  to { transform: scaleY(1); opacity: 1; }
}

@keyframes loading-away {
  to { opacity: 0; visibility: hidden; }
}

@keyframes hint-lifetime {
  0% { opacity: 0; transform: translate(-50%, 0.5rem); }
  12%, 72% { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, -0.25rem); visibility: hidden; }
}

@media (max-width: 64rem) {
  .spec-sheet {
    width: 15rem;
  }

  .spec-note {
    display: none;
  }

  .archive-note {
    grid-template-columns: 4rem minmax(0, 1fr);
  }

  .archive-facts {
    grid-column: 2;
    margin-top: 0;
  }
}

@media (max-width: 47.99rem) {
  .field-lab {
    min-height: 0;
  }

  .viewer::before {
    background:
      linear-gradient(0deg, rgba(3, 11, 18, 0.82), transparent 32%, transparent 75%, rgba(3, 11, 18, 0.62)),
      linear-gradient(90deg, rgba(3, 11, 18, 0.22), transparent 26%, transparent 74%, rgba(3, 11, 18, 0.22));
  }

  .identity {
    top: max(var(--space-md), env(safe-area-inset-top));
    left: max(var(--space-lg), env(safe-area-inset-left));
    width: calc(100vw - var(--space-2xl));
  }

  .home-link {
    min-height: 2.75rem;
    font-size: 0.75rem;
  }

  .identity-kicker {
    margin-top: var(--space-sm);
    font-size: 0.75rem;
  }

  .identity h1 {
    max-width: 12ch;
    font-size: 2rem;
    line-height: 0.95;
  }

  .identity-subtitle {
    margin-top: var(--space-sm);
    font-size: 0.875rem;
  }

  .spec-sheet,
  .view-rail,
  .desktop-tool {
    display: none;
  }

  .mobile-tool,
  .touch-hint {
    display: flex;
  }

  .tool-rail {
    right: max(var(--space-sm), env(safe-area-inset-right));
    bottom: max(var(--space-sm), env(safe-area-inset-bottom));
    left: max(var(--space-sm), env(safe-area-inset-left));
    width: auto;
    min-height: 4.25rem;
    transform: none;
  }

  .tool-rail::before,
  .tool-rail::after {
    display: none;
  }

  .tool-button {
    min-width: 0;
    min-height: 4.25rem;
    padding: var(--space-sm);
    flex: 1 1 25%;
  }

  .tool-button span {
    font-size: 1.25rem;
  }

  .tool-button b {
    font-size: 0.75rem;
  }

  .load-status {
    top: calc(env(safe-area-inset-top) + 11.5rem);
    right: max(var(--space-lg), env(safe-area-inset-right));
    bottom: auto;
  }

  #fa-help-btn.fa-help-btn {
    top: calc(env(safe-area-inset-top) + 13.5rem) !important;
    right: max(var(--space-lg), env(safe-area-inset-right)) !important;
    bottom: auto !important;
  }

  .loading-state,
  .error-state {
    top: 48%;
  }

  .annotations .annotation:not(.is-active) {
    display: none;
  }

  .annotation,
  .annotation--left,
  .annotation--right {
    right: var(--space-lg);
    bottom: 6.25rem;
    left: var(--space-lg);
    top: auto;
    width: auto;
    min-height: 3.5rem;
  }

  .archive-note {
    width: min(100% - var(--space-2xl), 42rem);
    padding: var(--space-3xl) 0;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .archive-index {
    width: 4rem;
  }

  .archive-copy h2 {
    max-width: 18ch;
    font-size: 2rem;
  }

  .archive-facts {
    grid-column: 1;
  }

  .dialog-grid,
  .dialog-parts {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 23rem) {
  .load-status {
    display: none;
  }
}

@media (max-height: 35rem) and (orientation: landscape) {
  .identity-kicker,
  .identity-subtitle,
  .load-status {
    display: none;
  }

  .spec-sheet,
  .view-rail {
    display: none;
  }

  .identity h1 {
    font-size: 1.5rem;
    line-height: 1;
  }

  .tool-rail {
    right: var(--space-sm);
    bottom: var(--space-sm);
    left: auto;
    width: min(26rem, 62vw);
  }

  .desktop-tool {
    display: none;
  }

  .mobile-tool {
    display: flex;
  }

  .tool-button {
    min-width: 0;
    flex: 1 1 25%;
  }

  .annotation,
  .annotation--left,
  .annotation--right {
    right: auto;
    bottom: var(--space-sm);
    left: var(--space-sm);
    width: min(15rem, 34vw);
  }
}

@media (hover: hover) and (pointer: fine) {
  .tool-button:hover:not(:disabled) span {
    transform: translateY(-1px);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (forced-colors: active) {
  .viewer::before,
  .viewer::after {
    display: none;
  }

  .view-button.is-active,
  .tool-button[aria-pressed="true"],
  .annotation.is-active {
    outline: 2px solid Highlight;
    outline-offset: -2px;
  }
}