/* ─── Material Studio — instrument UI ──────────────────────────────────── */

/* Palette mirrors physicallybased.info (dark variant): warm charcoal bg,
   warm light-grey ink, muted amber/warning accent, low-chroma category hues.
   Source: https://physicallybased.info/ — Anton Palmqvist. */
:root {
  --bg: #31302e;              /* PB.info --background-dark */
  --bg-2: #282725;            /* slightly deeper for nested panels */
  --ink: #bebeba;             /* PB.info --primary-dark */
  --ink-2: #8d8c87;           /* mid grey */
  --ink-3: #63635e;           /* PB.info --line-dark, repurposed as muted text */
  --line: rgba(190, 188, 181, 0.12);
  --line-2: rgba(190, 188, 181, 0.06);
  --accent: #cb863c;          /* PB.info --warning (warm amber) */
  --accent-soft: color-mix(in srgb, var(--accent) 22%, transparent);

  --pb-red:   #e7b8b8;        /* PB.info --red-dark */
  --pb-green: #a0dfbb;        /* PB.info --green-dark */
  --pb-blue:  #9bb0e2;        /* PB.info --blue-dark */

  --rail-w-l: 280px;
  --rail-w-r: 320px;
  --top-h: 52px;
  --hud-h: 60px;

  /* Category swatches sit in PB.info's muted register: c ≈ 0.06–0.09,
     hues drawn from their red/green/blue + warm-neutral palette. */
  --cat-metal:   #cb863c;     /* metallic = warning amber */
  --cat-glass:   var(--pb-blue);
  --cat-liquid:  oklch(0.78 0.08 240);
  --cat-organic: var(--pb-green);
  --cat-plastic: var(--pb-red);
  --cat-surface: oklch(0.78 0.03 70);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; background: var(--bg); color: var(--ink); }
body {
  font-family: "Inter", ui-sans-serif, -apple-system, system-ui, sans-serif;
  font-feature-settings: "ss01", "cv11";
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
.mono { font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace; font-variant-numeric: tabular-nums; }

/* App grid */
.app {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-columns: var(--rail-w-l) 1fr var(--rail-w-r);
  grid-template-rows: var(--top-h) 1fr var(--hud-h);
  grid-template-areas:
    "top   top    top"
    "left  stage  right"
    "left  hud    right";
  background: var(--bg);
}

/* Stage is left clean — no overlays on the sphere */

/* ─── topbar ─────────────────────────────────────────────────────────────── */
.topbar {
  grid-area: top;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 18px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(40,39,37,0.65), rgba(40,39,37,0.0));
  backdrop-filter: blur(8px);
  z-index: 10;
  min-width: 0;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 50%;
  border: 1px solid var(--line);
  background: radial-gradient(circle at 35% 30%, #fff, var(--accent) 40%, var(--bg-2) 80%);
  position: relative;
  box-shadow: 0 0 24px var(--accent-soft);
}
.brand-mark .dot {
  position: absolute; inset: 0; border-radius: 50%;
  background:
    radial-gradient(circle at 65% 70%, rgba(0,0,0,0.6), transparent 40%),
    radial-gradient(circle at 30% 25%, rgba(255,255,255,0.95), transparent 30%);
}
.brand-name { font: 700 12px/1 "Inter", sans-serif; letter-spacing: 0.18em; }
.brand-sub  { font: 500 10px/1 "JetBrains Mono", monospace; color: var(--ink-3); letter-spacing: 0.14em; margin-top: 4px; }

.topbar-mid {
  font: 500 11px/1 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.06em;
}
.kbd {
  display: inline-block;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--ink-2);
  margin: 0 2px;
  font-size: 10px;
}

.topbar-r { display: flex; align-items: center; gap: 24px; }
.topbar-stat { display: flex; flex-direction: column; gap: 3px; text-align: right; }
.topbar-stat .k { font: 600 9px/1 "JetBrains Mono", monospace; color: var(--ink-3); letter-spacing: 0.16em; }
.topbar-stat .v { font: 500 12px/1 "JetBrains Mono", monospace; color: var(--ink); letter-spacing: 0.04em; }

/* ─── rails ─────────────────────────────────────────────────────────────── */
.rail {
  position: relative;
  display: flex; flex-direction: column;
  background: linear-gradient(180deg, rgba(49,48,46,0.55), rgba(40,39,37,0.55));
  backdrop-filter: blur(10px);
  z-index: 6;
  min-height: 0;
  min-width: 0;
}
.rail-left  { grid-area: left;  border-right: 1px solid var(--line); }
.rail-right { grid-area: right; border-left:  1px solid var(--line); }

.rail-head { padding: 16px 16px 12px; border-bottom: 1px solid var(--line-2); }
.rail-eyebrow {
  font: 600 9px/1 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.18em;
  margin-bottom: 8px;
}
.rail-title { font: 600 18px/1.1 "Inter", sans-serif; letter-spacing: -0.01em; margin-bottom: 12px; }
.rail-title.spec-title { font-size: 17px; }

.search {
  width: 100%;
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.35);
  color: var(--ink);
  font: 500 13px/1 "Inter", sans-serif;
  padding: 9px 11px;
  border-radius: 6px;
  outline: none;
  transition: border-color 120ms;
}
.search:focus { border-color: var(--accent); }
.search::placeholder { color: var(--ink-3); }

.chips { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.chip {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-2);
  font: 500 10px/1 "Inter", sans-serif;
  letter-spacing: 0.04em;
  padding: 5px 9px;
  border-radius: 999px;
  cursor: pointer;
  transition: 120ms;
}
.chip:hover { color: var(--ink); border-color: rgba(255,255,255,0.18); }
.chip.is-on { color: var(--bg); background: var(--accent); border-color: var(--accent); }

.count {
  margin-top: 10px;
  font: 500 10px/1 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.1em;
}

/* material list */
.rail-list {
  flex: 1; min-height: 0;
  overflow-y: auto;
  padding: 4px 0 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.12) transparent;
}
.rail-list::-webkit-scrollbar { width: 8px; }
.rail-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 4px; }

.mat-row {
  display: grid;
  grid-template-columns: 16px 1fr auto auto;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 7px 16px;
  appearance: none;
  background: transparent;
  border: 0;
  border-left: 2px solid transparent;
  color: var(--ink-2);
  font: 500 13px/1.2 "Inter", sans-serif;
  text-align: left;
  cursor: pointer;
  transition: background 120ms, color 120ms;
}
.mat-row:hover { background: rgba(255,255,255,0.03); color: var(--ink); }
.mat-row.is-on {
  background: linear-gradient(90deg, var(--accent-soft), transparent 70%);
  border-left-color: var(--accent);
  color: var(--ink);
}
.mat-swatch {
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.6);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.08), inset 0 0 4px rgba(0,0,0,0.4);
}
.mat-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mat-cat {
  font: 600 9px/1 "JetBrains Mono", monospace;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.mat-row.is-on .mat-cat { color: var(--ink-2); }
.empty { padding: 24px; color: var(--ink-3); font-size: 12px; }

/* Favorite star (per row). Only fully visible when set; muted otherwise so it
   doesn't compete with the swatch. */
.mat-star {
  font-size: 13px;
  line-height: 1;
  color: transparent;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 3px;
  transition: color 100ms, background 100ms;
  user-select: none;
}
.mat-row:hover .mat-star { color: var(--ink-3); }
.mat-star:hover { color: var(--ink); background: rgba(255,255,255,0.08); }
.mat-star.is-on { color: var(--accent); }
.mat-row.is-on .mat-star.is-on { color: var(--accent); }

/* Thin divider between the pinned group and the rest of the list. */
.rail-divider {
  height: 1px;
  margin: 6px 16px;
  background: linear-gradient(90deg, var(--line), transparent);
}

/* ─── right rail spec sheet ────────────────────────────────────────────── */
.tag {
  display: inline-block;
  font: 600 9px/1 "JetBrains Mono", monospace;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--line);
  color: var(--ink-2);
}
.cat-metal   { color: var(--cat-metal); }
.cat-glass   { color: var(--cat-glass); }
.cat-liquid  { color: var(--cat-liquid); }
.cat-organic { color: var(--cat-organic); }
.cat-plastic { color: var(--cat-plastic); }
.cat-surface { color: var(--cat-surface); }

.block {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line-2);
}
.block-h {
  font: 600 9px/1 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.18em;
  margin-bottom: 10px;
  display: flex; justify-content: space-between; align-items: center;
}
.block-h.sub { margin-top: 12px; }

.row {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 12px;
  font: 500 11.5px/1.4 "Inter", sans-serif;
  padding: 3px 0;
}
.row-k { color: var(--ink-3); font: 500 11px/1.4 "JetBrains Mono", monospace; letter-spacing: 0.04em; }
.row-v { color: var(--ink); }
.row-v.mono { font: 500 12px/1.4 "JetBrains Mono", monospace; letter-spacing: 0.02em; }

/* Big combined color swatch — click to copy the display-sRGB hex. */
.albedo-swatch {
  display: block;
  position: relative;
  width: 100%;
  height: 64px;
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.5);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.06), inset 0 0 0 1px rgba(0,0,0,0.25);
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  padding: 0;
  transition: box-shadow 120ms, transform 120ms;
}
.albedo-swatch:hover { box-shadow: 0 0 0 1px var(--accent), 0 0 12px var(--accent-soft); }
.albedo-swatch.is-copied { box-shadow: 0 0 0 1px var(--accent), 0 0 16px var(--accent-soft); }
.albedo-swatch-fill { display: block; width: 100%; height: 100%; }
.albedo-swatch.is-copied::after {
  content: "COPIED";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font: 600 10px/1 "JetBrains Mono", monospace;
  letter-spacing: 0.2em;
  color: #fff;
  text-shadow: 0 1px 4px rgba(0,0,0,0.8), 0 0 8px rgba(0,0,0,0.6);
  pointer-events: none;
}

/* RGB cells: label + copyable value, no bar. */
.rgb-blocks { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 6px; }
.rgb-cell {
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 8px;
  background: rgba(0,0,0,0.25);
}
.rgb-l {
  font: 700 9px/1 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.16em;
  margin-bottom: 6px;
}
.rgb-v {
  font: 500 13px/1.1 "JetBrains Mono", monospace;
  color: var(--ink);
}

/* Click-to-copy tokens. The negative margins keep layout unchanged when
   inline so values stay aligned with non-copyable text. */
.copy {
  display: inline-block;
  padding: 1px 5px;
  margin: -1px -5px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 100ms, color 100ms;
}
.copy:hover { background: rgba(255,255,255,0.08); }
.copy.is-copied {
  background: var(--accent-soft);
  color: var(--accent);
}

/* Spaced run of copy tokens for multi-value rows (0–1, 0–255). */
.multi { display: inline-flex; gap: 10px; }

/* Credits block at the bottom of the spec sheet. */
.credits { border-bottom: 0; }
.link {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px dashed var(--line);
  transition: color 120ms, border-color 120ms;
}
.link:hover { color: var(--accent); border-bottom-color: var(--accent); }
.credits-note {
  margin-top: 10px;
  font: 500 10px/1.4 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}

/* ─── stage ─────────────────────────────────────────────────────────────── */
.stage { grid-area: stage; position: relative; overflow: hidden; min-width: 0; }
.canvas { width: 100%; height: 100%; display: block; }

/* ─── HUD ───────────────────────────────────────────────────────────────── */
.hud {
  grid-area: hud;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 18px;
  border-top: 1px solid var(--line);
  background: linear-gradient(0deg, rgba(40,39,37,0.65), rgba(40,39,37,0.0));
  backdrop-filter: blur(8px);
  z-index: 7;
  gap: 18px;
  min-width: 0;
}
.hud-l, .hud-r { display: flex; align-items: center; gap: 24px; min-width: 0; }
.hud-stat { display: flex; align-items: baseline; gap: 8px; }
.hud-stat .hud-k {
  font: 600 9px/1 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.16em;
}
.hud-stat .hud-v {
  font: 500 13px/1 "JetBrains Mono", monospace;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.slider {
  display: flex; align-items: center; gap: 8px;
  font: 600 9px/1 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.16em;
}
.slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 110px; height: 2px;
  background: rgba(255,255,255,0.12);
  border-radius: 1px;
}
.slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-soft);
}
.slider input[type="range"]::-moz-range-thumb {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 0;
  cursor: pointer;
}
.slider .mono { color: var(--ink); font-size: 11px; min-width: 36px; }

.hud-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.3);
  color: var(--ink-2);
  font: 600 10px/1 "JetBrains Mono", monospace;
  letter-spacing: 0.12em;
  padding: 7px 12px;
  border-radius: 5px;
  cursor: pointer;
  transition: 120ms;
}
.hud-btn:hover { color: var(--ink); border-color: rgba(255,255,255,0.2); }
.hud-btn.is-on { color: var(--accent); border-color: var(--accent); box-shadow: 0 0 12px var(--accent-soft); }

/* HDRI picker in the HUD. Matches the slider label style. */
.hud-select {
  display: flex; align-items: center; gap: 8px;
  font: 600 9px/1 "JetBrains Mono", monospace;
  color: var(--ink-3);
  letter-spacing: 0.16em;
}
.hud-select select {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.3);
  color: var(--ink);
  font: 500 11px/1 "JetBrains Mono", monospace;
  letter-spacing: 0.04em;
  padding: 6px 22px 6px 10px;
  border-radius: 5px;
  cursor: pointer;
  outline: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path fill='rgba(190,190,186,0.5)' d='M0 0h10L5 6z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: border-color 120ms;
}
.hud-select select:hover { border-color: rgba(190,190,186,0.22); }
.hud-select select:focus { border-color: var(--accent); }
.hud-select option { background: var(--bg-2); color: var(--ink); }

/* ─── responsive ────────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  :root { --rail-w-l: 240px; --rail-w-r: 260px; }
}
@media (max-width: 880px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: var(--top-h) 40vh 40vh var(--hud-h);
    grid-template-areas:
      "top"
      "stage"
      "left"
      "hud";
  }
  .rail-right { display: none; }
  .topbar-r { display: none; }
  .topbar-mid { display: none; }
  .hud {
    gap: 12px;
    overflow: hidden;
    padding: 0 14px;
  }
  .hud-l, .hud-r { gap: 14px; }
  .hud-stat .hud-v {
    max-width: 96px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .hud-l .hud-stat:nth-child(2) {
    display: none;
  }
  .hud-r .slider:nth-of-type(2),
  .hud-btn {
    display: none;
  }
  .slider input[type="range"] { width: 84px; }
}