:root {
  color-scheme: dark;
  --bg: #0a0c10;
  --bg-2: #0e1218;
  --panel: #14181f;
  --panel-2: #181d25;
  --panel-3: #1d232c;
  --line: #2a3340;
  --line-2: #3a4658;
  --text: #d8dee7;
  --text-dim: #98a3b3;
  --muted: #6b7787;
  --accent: #ff7a18;
  --accent-2: #ffab5c;
  --active: #8df9a8;
  --warn: #e75d4c;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.02);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;
  font-size: 12px;
  background:
    radial-gradient(circle at 70% -12%, rgba(255, 122, 24, 0.1), transparent 34%),
    radial-gradient(circle at 10% 0%, rgba(141, 249, 168, 0.05), transparent 26%),
    linear-gradient(180deg, #0b0e12 0%, #07090c 55%, var(--bg) 100%);
  color: var(--text);
  letter-spacing: 0.01em;
}

.app {
  width: min(1680px, calc(100% - 14px));
  margin: 8px auto 18px;
}

/* ============== HERO ============== */

.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  margin-bottom: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.hero h1 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text);
}

.eyebrow {
  margin: 0;
  font-size: 9px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--muted);
}

.build-tag {
  margin: 2px 0 0;
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero-actions {
  display: grid;
  grid-auto-flow: column;
  gap: 4px;
}

.hero-actions button {
  background: var(--panel-3);
  border: 1px solid var(--line-2);
  color: var(--text);
  border-radius: 2px;
  padding: 6px 12px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  width: auto;
  transition: background 80ms ease, border-color 80ms ease, color 80ms ease;
  font-family: inherit;
}

.hero-actions button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-actions button:active {
  background: var(--accent);
  color: #101010;
}

/* ============== LAYOUT ============== */

.layout {
  display: grid;
  grid-template-columns: 194px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0;
  box-shadow: var(--shadow);
}

/* ============== CONTROLS PANEL ============== */

.controls {
  display: grid;
  gap: 0;
  align-content: start;
  max-height: calc(100vh - 54px);
  overflow-y: auto;
  position: sticky;
  top: 8px;
  font-size: 11px;
  padding: 0;
  scrollbar-width: thin;
  scrollbar-color: var(--line-2) transparent;
}

.controls::-webkit-scrollbar {
  width: 4px;
}
.controls::-webkit-scrollbar-thumb {
  background: var(--line-2);
}

.param-group {
  border-bottom: 1px solid var(--line);
  padding: 0;
  background: transparent;
}

.param-group:last-of-type {
  border-bottom: none;
}

.param-group > summary {
  cursor: pointer;
  list-style: none;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 8px 10px;
  position: relative;
  user-select: none;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border-bottom: 1px solid var(--line);
}

.param-group > summary::marker,
.param-group > summary::-webkit-details-marker {
  display: none;
}

.param-group > summary::after {
  content: "+";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
  line-height: 1;
}

.param-group[open] > summary::after {
  content: "−";
}

.param-group[open] > summary {
  color: var(--accent-2);
}

.param-group > .group-body {
  padding: 8px 10px 10px;
  display: grid;
  gap: 8px;
}

/* ============== TABS ============== */

.tab-block {
  display: grid;
  gap: 4px;
}

.tab-block > span {
  font-size: 8.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.tab-row {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

.tab-button {
  width: auto;
  padding: 3px 7px;
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  border-radius: 2px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text-dim);
  cursor: pointer;
  line-height: 1.3;
  transition: background 80ms ease, color 80ms ease, border-color 80ms ease;
  font-family: inherit;
}

.tab-button:hover {
  border-color: var(--line-2);
  color: var(--text);
}

.tab-button.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a0c10;
  font-weight: 700;
}

.root-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px 6px;
  align-items: start;
}

.root-tabs > span {
  grid-column: 1 / -1;
}

.root-tabs small {
  display: block;
  margin-bottom: 2px;
  font-size: 8px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.voice-tabs {
  grid-column: 1 / -1;
}

/* ============== SLIDERS ============== */

label.slider {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1px 8px;
  padding: 2px 0;
}

label.slider span {
  grid-column: 1 / 2;
  font-size: 8.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

label.slider strong {
  grid-column: 2 / 3;
  grid-row: 1 / 2;
  text-align: right;
  font-weight: 600;
  color: var(--accent-2);
  font-variant-numeric: tabular-nums;
  font-size: 10px;
  min-width: 36px;
  letter-spacing: 0.02em;
}

label.slider input[type="range"] {
  grid-column: 1 / -1;
  margin: 0;
  height: 14px;
  background: transparent;
  appearance: none;
  -webkit-appearance: none;
}

label.slider input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--line-2);
  border-radius: 0;
}

label.slider input[type="range"]::-moz-range-track {
  height: 2px;
  background: var(--line-2);
  border-radius: 0;
}

label.slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 8px;
  height: 14px;
  background: var(--accent);
  border-radius: 1px;
  margin-top: -6px;
  border: none;
  box-shadow: 0 0 0 1px #0a0c10;
}

label.slider input[type="range"]::-moz-range-thumb {
  width: 8px;
  height: 14px;
  background: var(--accent);
  border-radius: 1px;
  border: none;
}

label.slider input[type="file"] {
  font-size: 9px;
  color: var(--text-dim);
  padding: 3px 0;
  background: transparent;
  border: 1px dashed var(--line-2);
  border-radius: 2px;
  width: 100%;
}

input,
button,
select {
  width: 100%;
  font-family: inherit;
}

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

/* ============== VISUAL PANEL ============== */

.visual {
  display: grid;
  gap: 8px;
  padding: 8px;
}

.source-stage {
  display: grid;
  gap: 8px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: linear-gradient(180deg, rgba(255, 122, 24, 0.06), rgba(255, 255, 255, 0.01));
}

.source-stage-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.source-stage-head strong {
  display: block;
  margin-top: 4px;
  color: var(--accent-2);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.source-pill {
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 4px 8px;
  color: var(--accent);
  background: rgba(255, 122, 24, 0.08);
}

.source-stage-image {
  width: 100%;
  display: block;
  border-radius: 2px;
  border: 1px solid var(--line);
  background: #f4f1e8;
  object-fit: contain;
  max-height: 210px;
}

canvas {
  width: 100%;
  border-radius: 2px;
  background: #050608;
  border: 1px solid var(--line);
  display: block;
}

#geometryCanvas {
  aspect-ratio: 1 / 1;
  height: auto;
  max-height: calc(100vh - 196px);
}

#luminanceCanvas {
  height: 44px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.feature-grid div,
.step {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.feature-grid div {
  padding: 6px 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.feature-grid span {
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.feature-grid strong {
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--accent-2);
  letter-spacing: 0.02em;
}

/* ============== STEPS ============== */

.step-block {
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 0;
  background: var(--panel);
}

.step-block > summary {
  cursor: pointer;
  list-style: none;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 8px 10px;
  position: relative;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border-bottom: 1px solid var(--line);
}

.step-block > summary::marker,
.step-block > summary::-webkit-details-marker {
  display: none;
}

.step-block > summary::after {
  content: "+";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 12px;
}

.step-block[open] > summary::after {
  content: "−";
}

.step-block[open] > summary {
  color: var(--accent-2);
}

.layer-grid {
  display: grid;
  gap: 6px;
  padding: 8px;
}

.layer-row {
  display: grid;
  gap: 4px;
}

.layer-row-header {
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.layer-row-header strong {
  color: var(--accent-2);
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 2px;
}

.step {
  min-height: 34px;
  padding: 2px 3px;
  display: grid;
  align-content: space-between;
  font-size: 8px;
  background: var(--panel-3);
}

.step strong {
  font-size: 10px;
  color: var(--text);
  font-weight: 600;
}

.step small {
  color: var(--muted);
  font-size: 7px;
  letter-spacing: 0.06em;
}

.step.is-rest {
  opacity: 0.35;
}

.step.is-accent {
  border-color: var(--accent);
}

.step.is-slide {
  box-shadow: inset 0 0 0 1px var(--active);
}

.step.is-current {
  background: var(--active);
  color: #0a0c10;
}

.step.is-current strong,
.step.is-current small {
  color: #0a0c10;
}

/* ============== RESPONSIVE ============== */

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .controls {
    max-height: none;
    position: static;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, 1fr);
  }

  .source-stage-image {
    max-height: 260px;
  }
}

@media (max-width: 640px) {
  .app {
    width: min(100% - 16px, 100%);
  }

  .hero-actions {
    grid-template-columns: repeat(2, 1fr);
  }

  .step-grid {
    grid-template-columns: repeat(8, 1fr);
  }
}