/* three-panel-sc.css — Spheres & Company-styled control panel for /3d/ experiments.
 *
 * Industrial paper/ink aesthetic lifted from /3d/index.php, dark-inverted so it
 * reads over the WebGL stage. Same DOM contract as three-panel.css:
 *   #hud     — bottom-right stats overlay
 *   #ui      — left-side control panel (slides via body.ui-hidden)
 *   #ui-tab  — chevron toggle
 *   .section — block heading (Barlow Condensed, red ▶ marker)
 *   .row / .lbl / .val / .hint / .keys / #info / #warn — control rows + meta
 */

/* ── Panel container ─────────────────────────────────────────────────────── */
#ui {
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 340px;
  background: rgba(12, 12, 10, 0.70);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-right: 1px solid #FF0000;
  color: #ECEAE4;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  padding: 0 0 0.5rem;
  overflow-y: auto;
  overflow-x: hidden;
  transition: transform 0.2s ease;
  z-index: 10;
}
body.ui-hidden #ui { transform: translateX(-340px); }

/* Thin scrollbar that doesn't break the industrial look (WebKit) */
#ui::-webkit-scrollbar           { width: 6px; }
#ui::-webkit-scrollbar-track     { background: transparent; }
#ui::-webkit-scrollbar-thumb     { background: #2A2A28; }
#ui::-webkit-scrollbar-thumb:hover { background: #FF0000; }

/* ── Toggle tab ──────────────────────────────────────────────────────────── */
#ui-tab {
  position: absolute;
  top: 50%;
  left: 340px;
  transform: translateY(-50%);
  width: 22px;
  height: 56px;
  background: #0C0C0A;
  color: #ECEAE4;
  border: 1px solid #1E1E1C;
  border-left: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 14px;
  z-index: 11;
  padding: 0;
  transition: left 0.2s ease, color 0.15s ease, background 0.15s ease;
}
#ui-tab:hover         { color: #FF0000; background: #16140F; }
#ui-tab::before       { content: '‹'; }
body.ui-hidden #ui-tab { left: 0; }
body.ui-hidden #ui-tab::before { content: '›'; }

/* ── Section headings (Barlow Condensed + red ▶) ─────────────────────────── */
.section {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 900;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #ECEAE4;
  background: rgba(12, 12, 10, 0.45);
  border-top: 1px solid rgba(30, 30, 28, 0.6);
  border-bottom: 1px solid #FF0000;
  padding: 0.55rem 1rem 0.5rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.section::before {
  content: '▶';
  color: #FF0000;
  font-size: 0.45rem;
  line-height: 1;
}
.section:first-child { border-top: none; }

/* ── Control rows ────────────────────────────────────────────────────────── */
.row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.42rem 1rem;
  border-bottom: 1px solid #16140F;
}
.row:last-of-type { border-bottom: none; }

.lbl {
  width: 96px;
  flex-shrink: 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #9A9A98;
}

/* ── Range sliders — thin track, square red thumb ───────────────────────── */
input[type=range] {
  flex: 1;
  min-width: 0;
  height: 14px;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  margin: 0;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 1px;
  background: #2A2A28;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 12px;
  background: #FF0000;
  border: none;
  border-radius: 0;
  margin-top: -5.5px;
  cursor: pointer;
  transition: background 0.15s ease;
}
input[type=range]:hover::-webkit-slider-thumb,
input[type=range]:focus::-webkit-slider-thumb { background: #FFDE00; }

input[type=range]::-moz-range-track {
  height: 1px;
  background: #2A2A28;
  border: none;
}
input[type=range]::-moz-range-thumb {
  width: 20px;
  height: 12px;
  background: #FF0000;
  border: none;
  border-radius: 0;
  cursor: pointer;
  transition: background 0.15s ease;
}
input[type=range]:hover::-moz-range-thumb,
input[type=range]:focus::-moz-range-thumb { background: #FFDE00; }
input[type=range]:focus { outline: none; }

/* ── Numeric value chip ──────────────────────────────────────────────────── */
.val {
  width: 58px;
  flex-shrink: 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  text-align: right;
  color: #ECEAE4;
  background: transparent;
  border: 1px solid #2A2A28;
  padding: 2px 5px;
  border-radius: 0;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.val:focus {
  outline: none;
  border-color: #FF0000;
  color: #FF0000;
}

/* ── Select dropdown ─────────────────────────────────────────────────────── */
select {
  flex: 1;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #ECEAE4;
  background-color: transparent;
  background-image: linear-gradient(45deg, transparent 50%, #FF0000 50%);
  background-position: right 7px center;
  background-size: 6px 6px;
  background-repeat: no-repeat;
  border: 1px solid #2A2A28;
  border-radius: 0;
  padding: 3px 18px 3px 6px;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  transition: border-color 0.15s ease;
}
select:hover, select:focus { border-color: #FF0000; outline: none; }
select option { background: #0C0C0A; color: #ECEAE4; }

/* ── Colour swatch ───────────────────────────────────────────────────────── */
input[type=color] {
  width: 36px;
  height: 20px;
  border: 1px solid #2A2A28;
  background: transparent;
  padding: 0;
  cursor: pointer;
  border-radius: 0;
  transition: border-color 0.15s ease;
}
input[type=color]:hover { border-color: #FF0000; }
input[type=color]::-webkit-color-swatch-wrapper { padding: 0; }
input[type=color]::-webkit-color-swatch         { border: none; border-radius: 0; }
input[type=color]::-moz-color-swatch            { border: none; border-radius: 0; }

/* Any free-standing number input (not .val) — kept for parity with old CSS */
input[type=number]:not(.val) {
  flex: 1;
  min-width: 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.6rem;
  color: #ECEAE4;
  background: transparent;
  border: 1px solid #2A2A28;
  padding: 3px 6px;
  border-radius: 0;
}
input[type=number]:not(.val):focus { outline: none; border-color: #FF0000; }

/* ── Inline hint (e.g. "negative = inward") ─────────────────────────────── */
.hint {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.5rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #5A5854;
  padding: 0 1rem 0.35rem calc(1rem + 96px + 0.55rem);
  margin-top: -0.25rem;
}
.hint::before { content: '// '; color: #FF0000; }

/* ── Info / warning / keys ───────────────────────────────────────────────── */
#info {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #9A9A98;
  padding: 0.7rem 1rem 0.45rem;
  border-top: 1px solid #1E1E1C;
  line-height: 1.7;
}
#warn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #FFDE00;
  padding: 0 1rem 0.5rem;
  line-height: 1.5;
}
#warn:empty { display: none; }

.keys {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.5rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #5A5854;
  padding: 0.6rem 1rem;
  border-top: 1px solid #1E1E1C;
  line-height: 2;
}
.keys::before {
  content: 'KEYS / キー';
  display: block;
  color: #FF0000;
  font-size: 0.5rem;
  letter-spacing: 0.2em;
  margin-bottom: 0.25rem;
}

/* ── HUD (bottom-right stats panel) ──────────────────────────────────────── */
#hud {
  position: absolute;
  bottom: 14px;
  right: 14px;
  background: rgba(12, 12, 10, 0.88);
  border: 1px solid #1E1E1C;
  border-left: 1px solid #FF0000;
  color: #ECEAE4;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.5rem 0.85rem;
  line-height: 1.85;
  pointer-events: none;
  user-select: none;
  z-index: 20;
  white-space: nowrap;
}

/* ── Narrow viewport ─────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  #ui      { width: 280px; }
  #ui-tab  { left: 280px; }
  body.ui-hidden #ui { transform: translateX(-280px); }
  .lbl     { width: 80px; }
  .hint    { padding-left: calc(1rem + 80px + 0.55rem); }
}