:root {
  --ink: #1c1813;
  --muted: #5f574a;
  --paper: #e9e0cd;
  --paper-2: #e1d6bf;
  --surface: #f6f0e2;
  --line: #c4b698;
  --edge: #1c1813;
  --accent: #d8431f;
  --display: "Oswald", "Arial Narrow", ui-sans-serif, system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
}

.ink-defs {
  position: absolute;
}

/* ---------- Stage ---------- */
.track {
  position: relative;
  width: 100%;
  height: 400vh;
}

.stage {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
  border-bottom: 2px solid var(--edge);
}

.stage[data-bg="paper"] {
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 20% 15%, rgba(28, 24, 19, 0.05), transparent 40%),
    radial-gradient(circle at 82% 80%, rgba(28, 24, 19, 0.06), transparent 42%);
}

.stage[data-bg="dark"] {
  background: #161310;
}

.stage[data-bg="grey"] {
  background: #8a8378;
}

.stage[data-bg="checker"] {
  background-color: #d9cfb9;
  background-image:
    linear-gradient(45deg, rgba(28, 24, 19, 0.12) 25%, transparent 25%, transparent 75%, rgba(28, 24, 19, 0.12) 75%),
    linear-gradient(45deg, rgba(28, 24, 19, 0.12) 25%, transparent 25%, transparent 75%, rgba(28, 24, 19, 0.12) 75%);
  background-size: 48px 48px;
  background-position: 0 0, 24px 24px;
}

.scene {
  position: absolute;
  inset: 0;
}

.layer {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 60vmin;
  height: 60vmin;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  transform-origin: center;
  will-change: transform, opacity;
}

.layer.is-hidden {
  display: none;
}

.layer.dissolve {
  -webkit-mask-image: var(--dissolve-mask);
  mask-image: var(--dissolve-mask);
  -webkit-mask-size: 240px 240px;
  mask-size: 240px 240px;
}

.stage[data-bg="dark"] .stage-overlay,
.stage[data-bg="grey"] .stage-overlay {
  color: var(--paper);
}

.stage-overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 0.4rem;
  color: var(--ink);
  pointer-events: none;
  text-align: center;
}

.stage-wordmark {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 5rem);
  letter-spacing: 0.01em;
}

.stage-wordmark .dot {
  color: var(--accent);
}

.stage-sub {
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  font-size: 0.8rem;
  opacity: 0.7;
}

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 1.4rem;
  z-index: 5;
  transform: translateX(-50%);
  font-family: var(--display);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.72rem;
  opacity: 0.55;
  transition: opacity 200ms ease;
}

.stage[data-bg="dark"] .scroll-hint,
.stage[data-bg="grey"] .scroll-hint {
  color: var(--paper);
}

/* ---------- HUD ---------- */
.hud {
  position: fixed;
  top: 0.9rem;
  right: 0.9rem;
  z-index: 20;
  width: 21rem;
  max-width: calc(100vw - 1.8rem);
  max-height: calc(100vh - 1.8rem);
  display: flex;
  flex-direction: column;
  border: 2px solid var(--edge);
  border-radius: 3px;
  background: var(--surface);
  box-shadow: 8px 10px 0 rgba(28, 24, 19, 0.22);
  filter: url(#inkRough);
}

.hud.is-hidden {
  display: none;
}

.hud-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.7rem 0.85rem;
  border-bottom: 2px solid var(--edge);
  background: var(--ink);
  color: var(--paper);
}

.hud-title {
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.hud-title span {
  color: var(--accent);
}

.hud-head-actions {
  display: flex;
  gap: 0.4rem;
}

.hud-body {
  overflow-y: auto;
  padding: 0.6rem 0.85rem 1rem;
}

.hud-group {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}

.hud-group:last-child {
  border-bottom: 0;
}

.hud-group-label {
  margin-bottom: 0.5rem;
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.btn {
  padding: 0.4rem 0.7rem;
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--ink);
  border: 2px solid var(--edge);
  border-radius: 2px;
  cursor: pointer;
}

.btn.ghost {
  color: var(--ink);
  background: var(--surface);
}

.btn:hover {
  box-shadow: 2px 2px 0 rgba(28, 24, 19, 0.3);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: none;
}

.row {
  display: flex;
  gap: 0.45rem;
}

.row .btn {
  flex: 1;
}

/* Layers list */
.layer-list {
  margin: 0 0 0.55rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
}

.layer-item {
  display: grid;
  grid-template-columns: 2rem 1fr auto auto;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.4rem;
  border: 1.5px solid var(--line);
  border-radius: 2px;
  background: var(--paper);
  cursor: pointer;
}

.layer-item.is-active {
  border-color: var(--edge);
  box-shadow: inset 0 0 0 1px var(--edge);
  background: var(--surface);
}

.layer-thumb {
  width: 2rem;
  height: 1.6rem;
  border: 1px solid var(--line);
  background-color: #cfc4ac;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

.layer-name {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.layer-mini {
  padding: 0.1rem 0.35rem;
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--muted);
  background: transparent;
  border: 0;
  cursor: pointer;
}

.layer-mini:hover {
  color: var(--ink);
}

/* Thumb picker */
.thumb-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.35rem;
}

.thumb {
  aspect-ratio: 1 / 1;
  border: 1.5px solid var(--line);
  border-radius: 2px;
  background-color: #cfc4ac;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 78%;
  cursor: pointer;
}

.thumb.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(216, 67, 31, 0.35);
}

/* Fields & dials */
.field {
  display: grid;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

.field > span {
  font-size: 0.78rem;
  color: var(--muted);
}

select {
  width: 100%;
  padding: 0.4rem 0.5rem;
  font: inherit;
  color: var(--ink);
  background: var(--paper);
  border: 1.5px solid var(--edge);
  border-radius: 2px;
}

.dial {
  margin-bottom: 0.5rem;
}

.dial label {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.15rem;
}

.dial output {
  font-family: var(--display);
  font-weight: 600;
  color: var(--ink);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.check {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  color: var(--muted);
  cursor: pointer;
}

.check strong {
  color: var(--ink);
}

.hint {
  margin: 0.35rem 0 0;
  font-size: 0.76rem;
  line-height: 1.35;
  color: var(--muted);
}

.css-out {
  width: 100%;
  height: 8.5rem;
  margin-top: 0.5rem;
  padding: 0.5rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.72rem;
  line-height: 1.4;
  color: var(--ink);
  background: var(--paper);
  border: 1.5px solid var(--edge);
  border-radius: 2px;
  resize: vertical;
}

.hud-foot {
  position: sticky;
  bottom: 0;
}

.progress {
  height: 0.5rem;
  border: 1.5px solid var(--edge);
  border-radius: 999px;
  background: var(--paper);
  overflow: hidden;
}

.progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--accent);
}

.foot-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 0.4rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.foot-meta a {
  color: var(--ink);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

.hud-show {
  position: fixed;
  top: 0.9rem;
  right: 0.9rem;
  z-index: 20;
  padding: 0.5rem 0.85rem;
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--paper);
  background: var(--ink);
  border: 2px solid var(--edge);
  border-radius: 2px;
  cursor: pointer;
}

@media (max-width: 700px) {
  .hud {
    width: calc(100vw - 1.4rem);
    top: auto;
    bottom: 0.7rem;
    right: 0.7rem;
    max-height: 70vh;
  }
}