:root {
  --bg: #14161a;
  --bg-2: #1b1e24;
  --panel: #1e2229;
  --line: #2c313b;
  --text: #e9ecf1;
  --muted: #98a0ad;
  --coral: #ff7a66;
  --coral-2: #ff9484;
  --coral-dim: rgba(255, 122, 102, 0.14);
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Scrollbars finas 8px */
* { scrollbar-width: thin; scrollbar-color: var(--line) transparent; }
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-thumb { background: var(--line); border-radius: 8px; }
*::-webkit-scrollbar-thumb:hover { background: #3a4150; }

/* ---- Topbar ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-2);
}
.brand { display: flex; align-items: baseline; gap: 12px; }
.logo {
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.3px;
  color: var(--coral);
}
.tag { color: var(--muted); font-size: 13px; }

.langs { display: flex; gap: 4px; }
.lang {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 5px 9px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
}
.lang:hover { color: var(--text); border-color: #3a4150; }
.lang.active { color: var(--bg); background: var(--coral); border-color: var(--coral); }

/* ---- Layout ---- */
.layout {
  flex: 1;
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: 0;
}

/* ---- Panel ---- */
.panel {
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.group h2 {
  margin: 0 0 10px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
  font-weight: 700;
}
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

.btn {
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: border-color .15s, background .15s;
}
.btn:hover { border-color: var(--coral); }
.btn.primary { background: var(--coral); color: #1a1013; border-color: var(--coral); }
.btn.primary:hover { background: var(--coral-2); }
.btn.on { background: var(--coral-dim); border-color: var(--coral); color: var(--coral-2); }

.hint { color: var(--muted); font-size: 12px; margin: 8px 0 0; }

/* swatch + color input */
.swatch-wrap { position: relative; display: inline-flex; }
.swatch {
  width: 30px; height: 30px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #00b140;
  display: inline-block;
}
#keyColor {
  position: absolute; inset: 0;
  opacity: 0; cursor: pointer; width: 100%; height: 100%;
  border: 0; padding: 0;
}

/* sliders */
.slider { display: block; margin-top: 12px; }
.slider > span {
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--muted); margin-bottom: 6px;
}
.slider output { color: var(--coral-2); font-variant-numeric: tabular-nums; }
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px; border-radius: 4px;
  background: var(--line); outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--coral); cursor: pointer; border: 2px solid var(--bg-2);
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--coral); cursor: pointer; border: 2px solid var(--bg-2);
}

/* views */
.views { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.view {
  background: var(--bg-2);
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 9px 8px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
}
.view:hover { color: var(--text); border-color: #3a4150; }
.view.active { color: var(--coral-2); background: var(--coral-dim); border-color: var(--coral); }

/* ---- Stage ---- */
.stage {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(1200px 600px at 50% -10%, #191c22, var(--bg));
  overflow: auto;
}
.canvas-wrap {
  position: relative;
  max-width: 100%;
  max-height: 100%;
  line-height: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,.45);
}
canvas#gl {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 190px);
  width: auto; height: auto;
  background: #0e1013;
}
.canvas-wrap.picking canvas#gl { cursor: crosshair; }

/* etiquetas RGBA */
.grid-labels { position: absolute; inset: 0; pointer-events: none; }
.gl-label {
  position: absolute;
  margin: 8px;
  font-size: 13px; font-weight: 800;
  color: #fff;
  background: rgba(0,0,0,.55);
  padding: 2px 8px; border-radius: 6px;
  line-height: 1.4;
}

/* hint de drop */
.drop-hint[hidden] { display: none; }
.drop-hint {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; gap: 6px;
  align-items: center; justify-content: center;
  text-align: center; color: var(--muted);
  background: repeating-conic-gradient(#20242c 0% 25%, #191c22 0% 50%) 50% / 28px 28px;
  line-height: 1.4;
}
.drop-hint p { margin: 0; font-size: 17px; font-weight: 600; color: var(--text); }
.drop-hint .small { font-size: 13px; font-weight: 400; color: var(--muted); }
.stage.dragover .drop-hint { outline: 2px dashed var(--coral); outline-offset: -12px; }

/* ---- Footer ---- */
.foot {
  padding: 10px 18px;
  border-top: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
  .panel { border-right: 0; border-bottom: 1px solid var(--line); }
  canvas#gl { max-height: 52vh; }
}