:root {
  --bg: #121216;
  --panel: #19191f;
  --panel-2: #212129;
  --line: #2c2c35;
  --line-2: #44444f;
  --text: #e8e6e3;
  --muted: #8b8a91;
  --accent: #f0b04a;
  --accent-bg: #2a2418;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}

/* Desktop: Materialleiste links, Spielfeld rechts. */
.app {
  height: 100%;
  height: 100dvh;
  display: grid;
  grid-template-columns: 264px minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr) auto;
  grid-template-areas:
    "top top"
    "side main"
    "side info";
  padding: var(--safe-t) var(--safe-r) var(--safe-b) var(--safe-l);
}

.top {
  grid-area: top;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand img { border-radius: 7px; flex: none; }
h1 { font-size: 17px; margin: 0; letter-spacing: .02em; font-weight: 650; }
.controls { display: flex; align-items: center; gap: 8px; }
.brush { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; }
.brush input { width: 110px; accent-color: var(--accent); }
.brush output { min-width: 2ch; color: var(--text); font-variant-numeric: tabular-nums; text-align: right; }

button {
  font: inherit;
  color: var(--text);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}
button:hover { border-color: var(--line-2); }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn { font-size: 13px; padding: 6px 12px; }
.btn[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-bg); }

#palette {
  grid-area: side;
  overflow-y: auto;
  padding: 12px 12px 16px 16px;
  border-right: 1px solid var(--line);
  background: var(--panel);
  scrollbar-width: thin;
  scrollbar-color: var(--line-2) transparent;
}
.group + .group { margin-top: 14px; }
.group h2 {
  margin: 0 0 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.mats { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.mat {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  font-size: 13px;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}
.mat[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-bg); }
.sw {
  flex: none;
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background-size: cover;
  image-rendering: pixelated;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .14);
}

main {
  grid-area: main;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 16px 16px 0;
}
canvas {
  display: block;
  image-rendering: pixelated;
  background: #0a0a0e;
  border-radius: 8px;
  box-shadow: 0 0 0 1px var(--line);
  touch-action: none;
  cursor: crosshair;
}

.info {
  grid-area: info;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px 12px;
  font-size: 13px;
  color: var(--muted);
  min-height: 44px;
}
.info p { margin: 0; }
.info strong { color: var(--text); font-weight: 600; }
.info .keys { margin-left: auto; white-space: nowrap; font-size: 12px; opacity: .8; }

/* Handy / schmales Fenster: Spielfeld oben, Materialien als
   waagrecht wischbare Leiste unten, gut mit dem Daumen erreichbar. */
@media (max-width: 760px) {
  .app {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr) auto auto;
    grid-template-areas: "top" "main" "info" "side";
  }
  .top { padding: 8px 12px; border-bottom: 0; }
  h1 { font-size: 16px; }
  .brush .label { display: none; }
  .brush input { width: 84px; }
  .btn { padding: 7px 10px; }
  main { margin: 0 12px; }
  .info { padding: 8px 12px 6px; min-height: 0; font-size: 12px; align-items: flex-start; }
  .info .sw { margin-top: 1px; }
  .info .keys { display: none; }
  #palette {
    display: flex;
    gap: 14px;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 8px 12px 12px;
    border-right: 0;
    border-top: 1px solid var(--line);
    scroll-snap-type: x proximity;
    scroll-padding-inline: 12px;
    -webkit-overflow-scrolling: touch;
  }
  .group { flex: none; scroll-snap-align: start; }
  .group + .group { margin-top: 0; }
  .group h2 { font-size: 10px; margin-bottom: 5px; }
  .mats { grid-template-columns: none; grid-template-rows: auto auto; grid-auto-flow: column; gap: 5px; }
  .mat { padding: 7px 9px; font-size: 12px; gap: 6px; }
  .sw { width: 15px; height: 15px; }
}