/* NEO_TEST */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-solid: rgb(0, 0, 0);
  --ui-title: rgba(130, 220, 255, 0.85);
  --ui-subtitle: rgba(80, 160, 200, 0.45);
  --ui-control-border: rgba(80, 160, 200, 0.35);
  --ui-control-fg: rgba(110, 210, 255, 0.8);
  --ui-control-hover-border: rgba(100, 200, 255, 0.6);
  --ui-control-hover-fg: rgba(150, 235, 255, 0.95);
  --ui-control-bg: rgba(5, 10, 20, 0.88);
  --ui-panel-bg: rgba(6, 12, 24, 0.4);
  --ui-control-option-bg: rgb(7, 12, 24);
  --ui-label: rgba(105, 198, 236, 0.78);
  --ui-value: rgba(145, 224, 255, 0.82);
  --ui-switch-glow: rgba(109, 204, 245, 0.55);
  --ui-stats: rgba(70, 150, 190, 0.35);
  --ui-object-label: rgba(110, 210, 255, 0.55);
  --ui-hint: rgba(70, 140, 180, 0.3);
  --ui-accent: rgb(95, 188, 230);
}

body {
  background: var(--bg-solid);
  overflow: hidden;
  font-family: 'Share Tech Mono', 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
}

#bg,
#c,
#fg,
#gpu {
  position: fixed;
  inset: 0;
}

#bg {
  z-index: 0;
  pointer-events: none;
}

#c {
  z-index: 1;
}

#fg {
  z-index: 2;
  pointer-events: none;
}

#bg-gpu {
  z-index: 1;
  pointer-events: none;
  visibility: hidden;
}

#gpu {
  z-index: 2;
  pointer-events: none;
  visibility: hidden;
}

canvas {
  display: block;
  cursor: grab;
}
canvas:active { cursor: grabbing; }

/* ── HUD overlay ─────────────────────────────────────────────────────── */
#ui {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 20;
  -webkit-user-select: none;
  user-select: none;
  font-family: 'Share Tech Mono', 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
}

/* top-left title */
#title {
  position: absolute;
  top: 30px;
  left: 34px;
}
#title h1 {
  font-size: 1.65rem;
  font-weight: 400;
  letter-spacing: 0.36rem;
  color: var(--ui-title);
  text-transform: uppercase;
}
#title p {
  font-size: 1.05rem;
  letter-spacing: 0.2rem;
  color: var(--ui-subtitle);
  text-transform: uppercase;
  margin-top: 8px;
}

/* top-right: object selector + stats */
#controls {
  position: absolute;
  top: 26px;
  right: 30px;
  width: 18.5rem;
  display: grid;
  gap: 0.62rem;
  pointer-events: auto;
  z-index: 22;
}

.control-panel {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--ui-control-border);
  background: var(--ui-panel-bg);
}

.panel-title {
  margin-bottom: 0.42rem;
  font-size: 0.82rem;
  letter-spacing: 0.1rem;
  color: var(--ui-value);
  text-transform: uppercase;
}

#obj-select,
#theme-mode {
  display: block;
  background: var(--ui-control-bg);
  border: 1px solid var(--ui-control-border);
  color: var(--ui-control-fg);
  padding: 10px 34px 10px 12px;
  font-family: 'Share Tech Mono', 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  font-size: 1.1rem;
  letter-spacing: 0.12rem;
  text-transform: uppercase;
  cursor: pointer;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  /* custom chevron */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpolygon points='0,0 10,0 5,6' fill='rgba(80,160,200,0.55)'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-color: var(--ui-control-bg);
  transition: border-color 0.2s, color 0.2s;
}

#obj-select {
  width: 100%;
}

#theme-mode {
  min-width: 7.4rem;
  background-position: right 8px center;
}

#obj-select:hover,
#theme-mode:hover {
  border-color: var(--ui-control-hover-border);
  color: var(--ui-control-hover-fg);
}

#obj-select option,
#theme-mode option {
  background: var(--ui-control-option-bg);
  color: var(--ui-control-fg);
  letter-spacing: 1px;
}

#theme-control {
  margin-top: 0.42rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--ui-label);
  font-size: 0.95rem;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
}

#lod-control {
  margin-top: 0.42rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--ui-label);
  font-size: 0.95rem;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
  cursor: pointer;
}

#lod-slider {
  width: 100%;
  flex: 1;
  accent-color: var(--ui-accent);
  cursor: pointer;
}

#lod-value {
  min-width: 2.6rem;
  text-align: right;
  color: var(--ui-value);
}

#custom-color-control {
  display: grid;
  gap: 0.38rem;
  color: var(--ui-label);
  text-transform: uppercase;
}

#custom-color-title {
  margin-bottom: 0.15rem;
}

#preset-swatches {
  margin-top: 0.15rem;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.34rem;
}

.preset-swatch {
  width: 100%;
  height: 1.05rem;
  border-radius: 0.18rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: var(--swatch-color, #fff);
  cursor: pointer;
  outline: none;
  transition: transform 0.14s ease, border-color 0.14s ease, box-shadow 0.14s ease;
}

.preset-swatch:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.42);
}

.preset-swatch:focus-visible {
  border-color: var(--ui-control-hover-border);
  box-shadow: 0 0 0 0.08rem var(--ui-switch-glow);
}

.preset-swatch.is-active {
  border-color: rgba(255, 255, 255, 0.82);
  box-shadow: 0 0 0.26rem rgba(255, 255, 255, 0.28);
}

.preset-swatch.is-shuffle {
  background: linear-gradient(120deg,
    #ff6a3d 0%,
    #ffd247 22%,
    #51dd6e 44%,
    #44c8ff 66%,
    #8d6dff 84%,
    #ff64bf 100%);
  border-color: rgba(255, 255, 255, 0.34);
}

.rgb-row {
  display: grid;
  grid-template-columns: 1.2rem 1fr 2.4rem;
  align-items: center;
  gap: 0.42rem;
  font-size: 0.8rem;
  letter-spacing: 0.08rem;
  cursor: pointer;
}

.rgb-key {
  color: var(--ui-value);
}

.rgb-row input[type='range'] {
  width: 100%;
  accent-color: var(--ui-accent);
}

.rgb-value {
  text-align: right;
  color: var(--ui-value);
}

#custom-preview {
  margin-top: 0.2rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.45rem;
  font-size: 0.78rem;
  letter-spacing: 0.08rem;
  color: var(--ui-value);
}

#custom-swatch {
  width: 1.7rem;
  height: 0.88rem;
  border-radius: 0.18rem;
  border: 1px solid var(--ui-control-border);
  background: var(--ui-accent);
}

#fill-control {
  margin-top: 0.42rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--ui-label);
  font-size: 0.95rem;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
  cursor: pointer;
}

#fill-opacity {
  width: 100%;
  flex: 1;
  accent-color: var(--ui-accent);
  cursor: pointer;
}

#fill-opacity-value {
  min-width: 2.6rem;
  text-align: right;
  color: var(--ui-value);
}

#wire-control {
  margin-top: 0.42rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--ui-label);
  font-size: 0.95rem;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
  cursor: pointer;
}

#wire-opacity {
  width: 100%;
  flex: 1;
  accent-color: var(--ui-accent);
  cursor: pointer;
}

#wire-opacity-value {
  min-width: 2.6rem;
  text-align: right;
  color: var(--ui-value);
}

#bg-density-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--ui-label);
  font-size: 0.95rem;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
  cursor: pointer;
}

#bg-density {
  width: 100%;
  flex: 1;
  accent-color: var(--ui-accent);
  cursor: pointer;
}

#bg-density-value {
  min-width: 2.6rem;
  text-align: right;
  color: var(--ui-value);
}

#bg-velocity-control {
  margin-top: 0.42rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--ui-label);
  font-size: 0.95rem;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
  cursor: pointer;
}

#bg-velocity {
  width: 100%;
  flex: 1;
  accent-color: var(--ui-accent);
  cursor: pointer;
}

#bg-velocity-value {
  min-width: 2.6rem;
  text-align: right;
  color: var(--ui-value);
}

#bg-opacity-control {
  margin-top: 0.42rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--ui-label);
  font-size: 0.95rem;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
  cursor: pointer;
}

#bg-opacity {
  width: 100%;
  flex: 1;
  accent-color: var(--ui-accent);
  cursor: pointer;
}

#bg-opacity-value {
  min-width: 2.6rem;
  text-align: right;
  color: var(--ui-value);
}

#stats {
  margin-top: 0.1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 0.85rem;
  row-gap: 0.18rem;
}
#stats span {
  display: block;
  font-size: 1.05rem;
  letter-spacing: 0.14rem;
  color: var(--ui-stats);
  text-transform: uppercase;
  line-height: 1.45;
}

/* renderer toggle button styling */
.renderer-toggle {
  cursor: pointer;
  text-decoration: underline;
  text-decoration-style: dotted;
  transition: color 0.15s, text-decoration-color 0.15s;
}
.renderer-toggle:hover {
  color: var(--ui-control-hover-fg);
  text-decoration-color: var(--ui-control-hover-border);
}

/* bottom-centre label */
#footer {
  position: absolute;
  bottom: 34px;
  width: 100%;
  text-align: center;
}

/* ── Slide-out panel toggle (portrait) ──────────────────────────────── */
#panel-toggle {
  display: none;
  pointer-events: auto;
  position: absolute;
  top: 26px;
  right: 0;
  height: 2.2rem;
  padding: 0 0.7rem;
  background: var(--ui-panel-bg);
  border: 1px solid var(--ui-control-border);
  border-right: none;
  border-radius: 0.4rem 0 0 0.4rem;
  color: var(--ui-control-fg);
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
  z-index: 21;
  align-items: center;
  gap: 0.4rem;
  outline: none;
  transition: background 0.2s, border-color 0.2s;
}
#panel-toggle:hover {
  background: var(--ui-control-bg);
  border-color: var(--ui-control-hover-border);
}

/* ── Concertina title shared styles ─────────────────────────────────── */
.concertina-title {
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0;
  padding-bottom: 0.35rem;
}
.concertina-title::after {
  content: '\25BC';
  font-size: 0.6rem;
  transition: transform 0.2s ease;
  color: var(--ui-control-fg);
}
.control-panel.collapsed .concertina-title::after {
  transform: rotate(-90deg);
}

/* ── Portrait (width ≤ 560px): slide-out full-width panel ──────────── */
@media (max-width: 560px) {
  #panel-toggle {
    display: flex;
    z-index: 21;
  }

  #controls {
    position: fixed;
    top: 0;
    right: 0;
    width: 100vw;
    max-height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 5rem 0.8rem 1.2rem 0.8rem;
    background: var(--ui-panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-left: 1px solid var(--ui-control-border);
    border-bottom: 1px solid var(--ui-control-border);
    border-radius: 0 0 0 0.5rem;
    transform: translateX(100%);
    transition: transform 0.25s ease;
    pointer-events: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  #controls.open { transform: translateX(0); }

  .control-panel {
    flex: 0 0 auto;
    padding: 0.4rem 0.6rem;
    margin-bottom: 0;
  }
  .concertina-title {
    padding-bottom: 0;
    margin-bottom: 0;
  }

  #title { top: 36px; left: 16px; font-size: 0.85rem; }
  #title h1 { font-size: 1.1rem; }
  #title p { font-size: 0.75rem; }
  #footer { bottom: 18px; }
  #obj-label { font-size: 1rem; letter-spacing: 0.2rem; }
  #hint { font-size: 0.8rem; margin-top: 6px; }

}

/* ── Landscape (height ≤ 550px): normal width, concertina + scroll ─── */
@media (max-height: 550px) {
  #panel-toggle { display: none; }

  #controls {
    position: fixed !important;
    top: 0 !important;
    right: 0 !important;
    width: 18.5rem !important;
    height: 100vh !important;
    overflow-y: scroll !important;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: 0.8rem;
    background: var(--ui-panel-bg);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  #controls-scroll {
    display: contents;
  }

  .control-panel {
    flex: 0 0 auto;
    padding: 0.4rem 0.6rem;
    margin-bottom: 0;
  }
  .concertina-title {
    padding-bottom: 0;
    margin-bottom: 0;
  }
}
#obj-label {
  font-size: 1.3rem;
  letter-spacing: 0.42rem;
  color: var(--ui-object-label);
  text-transform: uppercase;
  font-family: 'Share Tech Mono', 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
}
#hint {
  font-size: 1rem;
  letter-spacing: 0.16rem;
  color: var(--ui-hint);
  text-transform: uppercase;
  margin-top: 12px;
  font-family: 'Share Tech Mono', 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
}