:root {
  --bg:         #08090c;
  /* Bg color toolbox */
  --surface0:   #202020;
  /* Bg color channel widget */
  --surface1:   #151515;
  /* Bg color pills */
  --surface2:   #151515;
  /* Outline color widgets */
  --border:     #303030;
  /* Outline pills and slider bars */
  --border2:    #505050;
  --text:       #e0e0e0;
  --text-dim:   #d0d0d0;
  --text-faint: #c0c0c0;
  --accent:     #3d8bfd;
  --accent-dim: rgba(61,139,253,0.12);
  --mono:       'IBM Plex Mono', monospace;
  --sans:       'IBM Plex Sans', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 11px;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

#header {
  flex: 0 0 auto;
  height: 42px;
  background: var(--surface0);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  letter-spacing: 0.03em;
}
#header .title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.tag {
  font-size: 9px;
  font-weight: 500;
  padding: 2px 7px;
  border-radius: 2px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tag-webgl { background: var(--accent-dim); color: var(--accent); border: 1px solid rgba(140,140,200,0.25); }
.tag-ver  { background: rgba(255,255,255,0.04); color: var(--text-dim); border: 1px solid var(--border2); }
#header-right {
  margin-left: auto;
  font-size: 10px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

#body {
  flex: 1;
  display: flex;
  overflow: hidden;
}

#sidebar {
  width: 264px;
  flex: 0 0 264px;
  background: var(--surface0);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}
#sidebar::-webkit-scrollbar { width: 4px; }
#sidebar::-webkit-scrollbar-track { background: transparent; }
#sidebar::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

.sb-section {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.sb-section:last-child { border-bottom: none; }

.sec-header {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 10px;
}
.sec-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--text-faint);
  flex: 0 0 5px;
}
.sec-title {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.ch-card {
  background: var(--surface1);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px;
  margin-bottom: 7px;
  transition: border-color 0.2s;
}
.ch-card:last-child { margin-bottom: 0; }
.ch-card:hover { border-color: var(--border2); }

.ch-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 9px;
}
.ch-label {
  display: flex;
  align-items: center;
  gap: 6px;
}
.ch-indicator {
  width: 3px;
  height: 18px;
  border-radius: 2px;
  flex: 0 0 3px;
}
.ch-R .ch-indicator { background: #e05050; }
.ch-G .ch-indicator { background: #50d050; }
.ch-B .ch-indicator { background: #4080ee; }

.ch-letter {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.ch-R .ch-letter { color: #e05050; }
.ch-G .ch-letter { color: #50d050; }
.ch-B .ch-letter { color: #4080ee; }

.ch-sublabel {
  font-size: 9px;
  color: var(--text-faint);
  letter-spacing: 0.06em;
}

.ch-wl-right {
  display: flex;
  align-items: center;
  gap: 5px;
}
.ch-swatch {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex: 0 0 10px;
  border: 1px solid rgba(255,255,255,0.08);
  transition: background 0.1s;
}
.ch-nm {
  font-size: 12px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  min-width: 52px;
  text-align: right;
}

/* Spectrum track */
.spec-wrap {
  position: relative;
  margin-bottom: 2px;
}
.spec-bar {
  height: 4px;
  border-radius: 2px;
  margin-bottom: 5px;
  position: relative;
}
.spec-needle {
  position: absolute;
  top: -3px;
  width: 2px;
  height: 10px;
  background: rgba(255,255,255,0.9);
  border-radius: 1px;
  transform: translateX(-50%);
  pointer-events: none;
  box-shadow: 0 0 4px rgba(255,255,255,0.5);
  transition: left 0.05s;
}
.band-ticks {
  position: relative;
  height: 6px;
  margin-bottom: 3px;
}
.band-tick {
  position: absolute;
  top: 0;
  width: 1px;
  height: 4px;
  background: var(--text-faint);
  transform: translateX(-50%);
}

/* Slider */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 16px;
  background: transparent;
  cursor: pointer;
  outline: none;
  display: block;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--border2);
  border-radius: 1px;
}
input[type=range]::-moz-range-track {
  height: 2px;
  background: var(--border2);
  border-radius: 1px;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #d0d8ee;
  border: 1px solid rgba(0,0,0,0.6);
  margin-top: -5px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.6);
  transition: box-shadow 0.15s, transform 0.1s;
}
input[type=range]::-moz-range-thumb {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: #d0d8ee;
  border: 1px solid rgba(0,0,0,0.6);
}
input[type=range]:hover::-webkit-slider-thumb,
input[type=range]:focus::-webkit-slider-thumb {
  box-shadow: 0 0 0 3px rgba(61,139,253,0.2), 0 1px 3px rgba(0,0,0,0.6);
  transform: scale(1.15);
}

.ch-interp {
  margin-top: 4px;
  font-size: 9px;
  color: var(--text-dim);
  min-height: 13px;
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.post-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.post-row:last-child { margin-bottom: 0; }
.post-lbl {
  width: 74px;
  flex: 0 0 74px;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.post-val {
  width: 32px;
  flex: 0 0 32px;
  text-align: right;
  font-size: 10px;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.post-row input[type=range] { flex: 1; }

.bands-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.band-pill {
  font-size: 9px;
  padding: 2px 6px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 2px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

#viewport {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  background: var(--bg);
  position: relative;
  padding: 16px;
}
#glCanvas {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 42px - 32px);
  border: 1px solid var(--border2);
  box-shadow: 0 0 40px rgba(0,0,0,0.8);
}

#loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--bg);
  z-index: 20;
}
.spin {
  width: 24px; height: 24px;
  border: 2px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: rot 0.7s linear infinite;
}
@keyframes rot { to { transform: rotate(360deg); } }
.load-label { font-size: 10px; color: var(--text-dim); letter-spacing: 0.1em; text-transform: uppercase; }
.load-count { font-size: 11px; color: var(--accent); font-variant-numeric: tabular-nums; }

#err-box {
  display: none;
  margin-top: 8px;
  padding: 8px 10px;
  background: rgba(220,60,60,0.08);
  border: 1px solid rgba(220,60,60,0.25);
  border-radius: 3px;
  color: #e06060;
  font-size: 10px;
  line-height: 1.6;
}

#button-reset-spectra {
  width: 232px;
  margin-left: auto;
  font-size: 10px;
  padding: 4px 10px;
  background: var(--surface1);
  border: 1px solid var(--border2);
  color: var(--text);
  cursor: pointer;
}

#button-reset-pp {
  width: 232px;
  margin-left: auto;
  font-size: 10px;
  padding: 4px 10px;
  background: var(--surface1);
  border: 1px solid var(--border2);
  color: var(--text);
  cursor: pointer;
}

#button-save {
  width: 232px;
  margin-left: auto;
  font-size: 10px;
  padding: 4px 10px;
  background: var(--surface1);
  border: 1px solid var(--border2);
  color: var(--text);
  cursor: pointer;
}

#button-share {
  width: 232px;
  margin-left: auto;
  font-size: 10px;
  padding: 4px 10px;
  background: var(--surface1);
  border: 1px solid var(--border2);
  color: var(--text);
  cursor: pointer;
}