body {
  margin: 0;
  background: #0d0d0f;
  color: #e8e8ea;
  font-family: monospace;
}

.shaders-main {
  padding: 24px;
}

.shaders-main h1 {
  margin: 0 0 4px;
  font-weight: normal;
  letter-spacing: 0.15em;
}

.shaders-blurb {
  margin: 0 0 20px;
  opacity: 0.6;
}

/* the gallery: canvas + overlay stacked in one positioned box */
#gallery {
  position: relative;
  width: 100%;
}

.gallery-canvas {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
}

.gallery-overlay {
  position: absolute;
  top: 0;
  left: 0;
}

/* one tile per shader, sitting exactly over its slice of the canvas.
   transparent so the shader shows through; the border + caption are the chrome. */
.tile {
  position: absolute;
  box-sizing: border-box;
  border: 1px solid rgba(255, 255, 255, 0.12);
  cursor: pointer;
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.tile:hover {
  border-color: rgba(255, 255, 255, 0.55);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.25), 0 6px 20px rgba(0, 0, 0, 0.5);
  z-index: 2;
}

.tile.selected {
  border-color: #8ad;
  box-shadow: 0 0 0 2px #8ad;
  z-index: 3;
}

.tile-caption {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 2px 6px;
  font-size: 11px;
  color: #fff;
  background: rgba(0, 0, 0, 0.55);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tile:hover .tile-caption {
  opacity: 1;
}

/* a shader that failed to fetch/compile/link: dead, but labelled (hover for why) */
.tile.broken {
  border-color: rgba(255, 80, 80, 0.4);
  background: repeating-linear-gradient(
    45deg, #1a1012, #1a1012 8px, #140c0e 8px, #140c0e 16px
  );
  cursor: help;
}

.tile.broken .tile-caption {
  opacity: 1;
  color: #f99;
}