:root {
  color-scheme:dark;
  --bg:#101b20;
  --panel:#17252a;
  --line:#304045;
  --ink:#e8eae0;
  --muted:#a0b0ad;
  --mint:#c4e6b4;
  --serif:Georgia,'Times New Roman',serif;
  --mono:'Courier New',monospace;
}

* {
  box-sizing:border-box;
}

body {
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:14px/1.5 Arial,Helvetica,sans-serif;
}

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

button {
  font:inherit;
  color:inherit;
  cursor:pointer;
}

button:focus-visible,a:focus-visible,input:focus-visible,canvas:focus-visible {
  outline:2px solid var(--mint);
  outline-offset:5px;
}

button {
  border:0;
}

button:disabled {
  opacity:.4;
  cursor:default;
}

button:hover {
  color:var(--mint);
}

button:active {
  transform:translateY(1px);
}

a {
  color:inherit;
  text-decoration:none;
}

.masthead,main {
  max-width:1600px;
  margin:0 auto;
  padding:0 54px;
}

.masthead {
  height:83px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  border-bottom:1px solid var(--line);
  font:10px var(--mono);
  letter-spacing:1.5px;
}

.back {
  display:flex;
  align-items:center;
  gap:18px;
}

.back:first-letter {
  font-size:23px;
}

.edition {
  color:var(--muted);
}

.edition b {
  font-weight:400;
  margin-left:18px;
  color:var(--mint);
}

.intro {
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  padding:42px 0 35px;
}

.eyebrow {
  font:10px var(--mono);
  letter-spacing:2px;
  color:var(--mint);
  margin:0 0 12px;
}

h1 {
  font:normal clamp(58px,6.3vw,96px)/1 var(--serif);
  letter-spacing:-5px;
  margin:0;
}

h1 span {
  font:17px Arial;
  vertical-align:top;
  display:inline-block;
  margin:12px 0 0 8px;
  letter-spacing:0;
}

.intro-copy {
  color:var(--muted);
  font-size:14px;
  line-height:1.8;
  margin:0 0 4px;
}

.laboratory {
  display:grid;
  grid-template-columns:minmax(0,1fr) 292px;
  border:1px solid var(--line);
  border-radius:4px;
  overflow:hidden;
}

.tank-panel {
  min-width:0;
  display:flex;
  flex-direction:column;
  background:#0a2227;
}

.tank-topline {
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:17px 22px;
  font:9px var(--mono);
  letter-spacing:1.3px;
  background:var(--panel);
  border-bottom:1px solid var(--line);
  color:var(--muted);
}

.live-dot {
  display:inline-block;
  width:5px;
  height:5px;
  background:var(--mint);
  border-radius:50%;
  margin:0 6px 1px 0;
}

.viewport {
  position:relative;
  flex:1;
  min-height:440px;
  overflow:hidden;
  isolation:isolate;
  background:#0b343c;
}

.viewport canvas {
  display:block;
  width:100%;
  height:100%;
  position:absolute;
  inset:0;
  touch-action:none;
  cursor:crosshair;
}

#overlay {
  pointer-events:none;
}

.surface-label {
  position:absolute;
  top:25px;
  left:26px;
  font:10px/1.8 var(--mono);
  letter-spacing:3px;
  color:#d7efdf99;
  pointer-events:none;
}

.surface-label span {
  font-size:7px;
  letter-spacing:1.5px;
}

.coordinates {
  position:absolute;
  inset:100px 24px 66px;
  border-left:1px solid #c4e6b421;
  border-bottom:1px solid #c4e6b421;
  pointer-events:none;
  font:8px var(--mono);
  color:#d7efdf77;
}

.coordinates span:first-child {
  position:absolute;
  top:-17px;
  left:-2px;
}

.coordinates span:last-child {
  position:absolute;
  bottom:-4px;
  right:-12px;
}

.canvas-hint {
  pointer-events:none;
  position:absolute;
  bottom:22px;
  left:50%;
  transform:translateX(-50%);
  white-space:nowrap;
  border:1px solid #b9dec342;
  background:#102c30ba;
  backdrop-filter:blur(12px);
  padding:9px 17px;
  border-radius:30px;
  color:#d8e9dc;
  font-size:11px;
  transition:opacity .7s;
}

.canvas-hint span {
  margin-left:12px;
  color:var(--mint);
}

.canvas-hint.dismissed {
  opacity:0;
}

.transport {
  display:flex;
  align-items:center;
  padding:12px 18px;
  gap:17px;
  background:var(--panel);
  border-top:1px solid var(--line);
  font-size:10px;
  min-height:57px;
}

.transport button {
  background:none;
  padding:5px 0;
}

.transport #play {
  min-width:62px;
  text-align:left;
}

.transport #play-icon {
  color:var(--mint);
  margin-right:7px;
  font-size:14px;
}

.transport-right {
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:20px;
}

#source-count {
  font:8px var(--mono);
  color:var(--muted);
  letter-spacing:1px;
}

.controls {
  background:var(--panel);
  border-left:1px solid var(--line);
  padding:22px;
}

.control-section {
  padding-bottom:21px;
  border-bottom:1px solid var(--line);
  margin-bottom:20px;
}

.section-label {
  font:9px var(--mono);
  letter-spacing:1.3px;
  margin:0 0 15px;
  color:var(--muted);
}

.section-label>span {
  color:var(--mint);
  margin-right:10px;
}

.preset-grid {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
}

.preset-grid button {
  display:flex;
  flex-direction:column;
  gap:3px;
  align-items:center;
  padding:11px 4px 9px;
  background:#1c2d32;
  border:1px solid var(--line);
  border-radius:3px;
  color:var(--muted);
  font-size:10px;
}

.preset-grid button[aria-pressed=true] {
  border-color:#b4d9a7;
  color:var(--mint);
  background:#c4e6b409;
}

.scene-art {
  font:23px/1.4 var(--serif);
  height:31px;
  letter-spacing:2px;
  color:#acd4c1;
}

.scene-art.interference {
  letter-spacing:-8px;
  padding-right:8px;
}

.tools {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:3px;
}

.tools button {
  padding:6px 0 7px;
  background:transparent;
  border:1px solid transparent;
  border-radius:3px;
  font-size:9px;
  color:var(--muted);
}

.tools button span {
  display:block;
  font:23px/1.3 var(--mono);
  margin-bottom:5px;
}

.tools button[aria-pressed=true] {
  background:#c4e6b410;
  border-color:#c4e6b444;
  color:var(--mint);
}

.tool-help {
  color:var(--muted);
  font-size:10px;
  line-height:1.6;
  min-height:32px;
  margin:10px 0 0;
}

.tuning label {
  display:flex;
  justify-content:space-between;
  font-size:11px;
  margin-top:13px;
}

.tuning output {
  font:10px var(--mono);
  color:var(--muted);
}

input[type=range] {
  appearance:none;
  display:block;
  width:100%;
  height:3px;
  margin:14px 0 20px;
  border-radius:2px;
  background:#3c5154;
  cursor:pointer;
  accent-color:var(--mint);
}

input[type=range]::-webkit-slider-thumb {
  appearance:none;
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--mint);
}

input[type=range]::-moz-range-thumb {
  width:10px;
  height:10px;
  border:0;
  border-radius:50%;
  background:var(--mint);
}

.palette-row {
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-size:11px;
  margin-top:23px;
}

.palette-row>div {
  display:flex;
  gap:11px;
}

.swatch {
  width:18px;
  height:18px;
  border-radius:50%;
  border:1px solid #ffffff30;
}

.swatch[aria-pressed=true] {
  outline:1px solid var(--mint);
  outline-offset:3px;
}

.lagoon {
  background:linear-gradient(130deg,#6fd6b5,#143d45);
}

.copper {
  background:linear-gradient(130deg,#f3c376,#764026);
}

.midnight {
  background:linear-gradient(130deg,#b6b3f0,#222c50);
}

.explanation {
  display:flex;
  gap:11px;
  padding:0 0 2px;
}

.explanation-mark {
  color:var(--mint);
  font-size:24px;
  line-height:1;
}

.explanation h2 {
  font:normal 18px var(--serif);
  margin:0 0 7px;
}

.explanation p {
  color:var(--muted);
  font-size:10px;
  line-height:1.8;
  margin:0;
}

footer {
  display:flex;
  justify-content:space-between;
  align-items:center;
  color:var(--muted);
  font:8px var(--mono);
  letter-spacing:1px;
  padding:23px 0;
}

footer button {
  background:none;
  padding:0;
  font:10px Arial;
  letter-spacing:0;
}

footer button span {
  color:var(--mint);
  margin-left:8px;
}

.keyboard-hint {
  letter-spacing:0;
}

#about {
  max-width:760px;
  margin:14px auto 50px;
  padding:28px;
  border:1px solid var(--line);
  color:var(--muted);
  font-size:13px;
}

#about h2 {
  font:normal 28px var(--serif);
  color:var(--ink);
  margin-top:0;
}

#about p:last-child {
  font-size:11px;
}

.render-error {
  position:absolute;
  inset:30%;
  background:var(--panel);
  padding:20px;
}

.sr-only {
  position:absolute;
  width:1px;
  height:1px;
  overflow:hidden;
  clip-path:inset(50%);
}

@media(min-width:1400px) {
  .controls {
    padding:26px;
  }
  .laboratory {
    grid-template-columns:minmax(0,1fr) 316px;
  }
  .viewport {
    min-height:570px;
  }
}

@media(max-width:1050px) {
  .masthead,main {
    padding-left:28px;
    padding-right:28px;
  }
  .intro-copy {
    font-size:12px;
  }
  .laboratory {
    grid-template-columns:minmax(0,1fr) 262px;
  }
  .controls {
    padding:18px;
  }
  .transport {
    gap:12px;
  }
  .transport-right {
    gap:12px;
  }
  #source-count {
    display:none;
  }
}

@media(max-width:760px) {
  .masthead,main {
    padding-left:18px;
    padding-right:18px;
  }
  .masthead {
    height:62px;
    font-size:8px;
    letter-spacing:.7px;
  }
  .edition {
    display:none;
  }
  .intro {
    padding:29px 0 24px;
  }
  .eyebrow {
    font-size:8px;
    letter-spacing:1.3px;
  }
  h1 {
    font-size:61px;
    letter-spacing:-3px;
  }
  h1 span {
    font-size:12px;
  }
  .intro-copy {
    display:none;
  }
  .laboratory {
    display:block;
  }
  .viewport {
    height:66vw;
    min-height:300px;
    max-height:550px;
  }
  .controls {
    border-left:0;
    border-top:1px solid var(--line);
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:20px;
    padding:20px;
  }
  .control-section {
    margin-bottom:0;
    padding-bottom:18px;
  }
  .scenes {
    grid-column:1 / -1;
  }
  .preset-grid {
    grid-template-columns:repeat(4,1fr);
  }
  .preset-grid button {
    font-size:9px;
  }
  .section-label {
    font-size:8px;
    letter-spacing:.6px;
  }
  .tuning {
    grid-row:2 / 4;
    grid-column:2;
  }
  .explanation {
    grid-column:1;
    font-size:10px;
  }
  .tools {
    grid-template-columns:repeat(2,1fr);
  }
  .tools button {
    font-size:10px;
  }
  .transport {
    padding:10px 14px;
  }
  .canvas-hint {
    font-size:10px;
    padding:8px 12px;
  }
  .tank-topline {
    padding:13px 15px;
    font-size:8px;
  }
  .keyboard-hint {
    display:none;
  }
  footer {
    font-size:7px;
    letter-spacing:.4px;
    gap:10px;
  }
  .surface-label {
    left:20px;
    top:20px;
  }
  .coordinates {
    inset:80px 19px 58px;
  }
}

@media(prefers-reduced-motion:reduce) {
  * {
    scroll-behavior:auto;
    transition:none!important;
  }
}

/* Keep instrument labels legible without competing with the surface. */
.section-label {
  font-size:10px;
  letter-spacing:1px;
}

.preset-grid button {
  font-size:12px;
}

.tools button {
  font-size:11px;
}

.tool-help,.explanation p {
  font-size:12px;
}

.tuning label,.palette-row {
  font-size:12px;
}

.tuning output {
  font-size:11px;
}

.transport {
  font-size:12px;
}

.tank-topline {
  padding-top:10px;
  padding-bottom:10px;
}

.view-switch {
  display:flex;
  gap:3px;
  border:1px solid var(--line);
  border-radius:4px;
  padding:3px;
}

.view-switch button {
  padding:5px 10px;
  background:none;
  border-radius:2px;
  font-size:10px;
  color:var(--muted);
}

.view-switch button[aria-pressed=true] {
  background:#c4e6b417;
  color:var(--mint);
}

.field-key {
  position:absolute;
  right:25px;
  top:27px;
  align-items:center;
  gap:8px;
  font:8px var(--mono);
  letter-spacing:1px;
  color:#e8eae0bb;
  pointer-events:none;
}

.field-key:not([hidden]) {
  display:flex;
}

.field-key i {
  display:block;
  width:64px;
  height:5px;
  background:linear-gradient(90deg,#587ac9,#0c2028,#d5ed86);
}

@media(max-width:760px) {
  .section-label {
    font-size:9px;
  }
  .preset-grid button {
    font-size:10px;
  }
  .tool-help,.explanation p {
    font-size:11px;
  }
  .tuning label,.palette-row {
    font-size:11px;
  }
  .view-switch button {
    padding:4px 8px;
  }
  .tank-topline {
    font-size:8px;
  }
  .field-key {
    right:18px;
    top:24px;
    font-size:7px;
  }
  .field-key i {
    width:36px;
  }
}

.scene-art {
  display:block;
  width:60px;
  max-width:100%;
  height:32px;
}

.scene-art svg {
  display:block;
  width:100%;
  height:100%;
  fill:none;
  stroke:currentColor;
  stroke-width:1;
  stroke-linecap:round;
}

input[type=range] {
  height:22px;
  margin:4px 0 11px;
  background:none;
}

input[type=range]::-webkit-slider-runnable-track {
  height:3px;
  background:#3c5154;
  border-radius:2px;
}

input[type=range]::-webkit-slider-thumb {
  margin-top:-3.5px;
}

input[type=range]::-moz-range-track {
  height:3px;
  background:#3c5154;
  border-radius:2px;
}

.swatch {
  width:22px;
  height:22px;
}


/* 3D scene camera tools sit above the basin, separate from drawing tools. */
.viewport { background: #1b2c31; min-height: 590px; }
.camera-controls { position: absolute; top: 72px; left: 24px; display: flex; gap: 3px; padding: 4px; border: 1px solid #b9dec330; border-radius: 5px; background: #102329dd; backdrop-filter: blur(12px); }
.camera-controls button { padding: 7px 10px; border-radius: 3px; background: none; font-size: 11px; color: var(--muted); }
.camera-controls button[aria-pressed=true] { background: #c4e6b422; color: var(--mint); }
.camera-controls button:hover { color: var(--mint); }
.surface-label span { letter-spacing: 1px; }
.render-error { inset: auto 12%; top: 40%; text-align: center; border: 1px solid var(--line); border-radius: 5px; }
@media (max-width: 760px) {
  .viewport { height: 100vw; min-height: 370px; max-height: 550px; }
  .camera-controls { top: 67px; left: 15px; }
  .camera-controls button { padding: 9px 8px; font-size: 10px; }
  .surface-label { top: 18px; left: 18px; }
  .field-key { top: auto; bottom: 65px; }
  .canvas-hint { font-size: 9px; }
}