:root {
  --bg: #1d3a1d;
  --bar: #c0c0c0;
  --bar-text: #000;
  --bar-hi: #fff;
  --bar-lo: #808080;
  --active: #000080;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  font: 13px Tahoma, Verdana, "Segoe UI", system-ui, sans-serif;
  color: var(--bar-text);
  overscroll-behavior: none;
}

body { display: flex; flex-direction: column; }

header {
  background: var(--bar);
  border-bottom: 1px solid var(--bar-lo);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  justify-content: center;
  padding: 4px 8px calc(4px);
  padding-top: max(4px, env(safe-area-inset-top));
}

nav, #actions { display: flex; flex-wrap: wrap; gap: 2px; }

button {
  font: inherit;
  background: var(--bar);
  color: var(--bar-text);
  border: 1px solid;
  border-color: var(--bar-hi) var(--bar-lo) var(--bar-lo) var(--bar-hi);
  padding: 3px 8px;
  min-height: 28px;
  cursor: pointer;
}
button:active { border-color: var(--bar-lo) var(--bar-hi) var(--bar-hi) var(--bar-lo); }
nav button[aria-pressed="true"] { background: var(--active); color: #fff; }
#sound[aria-pressed="false"] { text-decoration: line-through; }

main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  position: relative;
  padding-bottom: env(safe-area-inset-bottom);
}

canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  touch-action: none;
  box-shadow: 0 0 0 1px #000, 0 4px 24px rgba(0, 0, 0, .5);
  -webkit-user-select: none;
  user-select: none;
}

#toast {
  position: absolute;
  bottom: 12%;
  left: 50%;
  transform: translateX(-50%);
  background: #ffffe1;
  border: 1px solid #000;
  padding: 6px 12px;
  max-width: 90%;
  text-align: center;
  pointer-events: none;
}

dialog {
  background: var(--bar);
  border: 2px solid;
  border-color: var(--bar-hi) var(--bar-lo) var(--bar-lo) var(--bar-hi);
  padding: 0;
  max-width: min(420px, 94vw);
}
dialog::backdrop { background: rgba(0, 0, 0, .4); }
dialog form { padding: 0 12px 12px; }
dialog h2 {
  margin: 0 -12px 10px;
  padding: 4px 8px;
  font-size: 13px;
  background: var(--active);
  color: #fff;
}
dialog menu { display: flex; justify-content: flex-end; gap: 6px; padding: 0; margin: 12px 0 0; }

.field { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin: 6px 0; }
.field select { font: inherit; }

#prompt-buttons { display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; }
#prompt-buttons button { min-width: 40px; }

#help-dialog { width: min(560px, 94vw); }
#help-frame { width: 100%; height: min(70vh, 600px); border: 1px solid var(--bar-lo); background: #fff; margin-top: 12px; }