:root {
  --bg: #0b1020;
  --panel: rgba(255,255,255,0.06);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.70);
  --accent: #8bd3ff;
  --win: #7CFFB2;
  --lose: #ff8bb0;

  --shadow: 0 10px 24px rgba(0,0,0,0.26);
  --radius: 18px;
  --stroke: rgba(255,255,255,0.12);

  /* FLAT board palette */
  --floor: rgba(255,255,255,0.06);
  --gridline: rgba(255,255,255,0.18);
  --wall: rgba(0,0,0,0.62);

  /* Search states */
  --open: rgba(139,211,255,0.22);
  --closed: rgba(255,139,176,0.18);
  --path: rgba(124,255,178,0.26);

  /* Start/Goal hues (HSL) */
  --startH: 170;
  --goalH: 315;

  /* Board geometry knobs (flat-top hex) */
  --gapX: 0px;
  --gapY: 0px;
  --pad: 5px;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background:
    radial-gradient(1000px 650px at 20% 15%, rgba(139,211,255,0.16), transparent 60%),
    radial-gradient(900px 650px at 80% 30%, rgba(124,255,178,0.12), transparent 55%),
    radial-gradient(900px 650px at 50% 85%, rgba(255,139,176,0.10), transparent 55%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 14px;
}

.wrap { width: min(1120px, 100%); display: grid; gap: 14px; }

.card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.headerCard { padding: 16px 18px; }

h1 { margin: 0 0 6px; font-size: 22px; letter-spacing: 0.2px; }
.sub { color: var(--muted); font-size: 14px; line-height: 1.35; max-width: 75ch; }

.grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 980px) {
  .grid { grid-template-columns: 1.25fr 0.75fr; align-items: start; }
}

.game.card { padding: 16px; }
.side.card { padding: 16px; }

.toprow {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.status {
  font-size: 14px;
  color: var(--muted);
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--stroke);
}

/* status indicator: flat-top hex */
.dot {
  width: 12px;
  height: 10px;
  background: var(--accent);
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
}

button, select, input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  font: inherit;
}

button, select {
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.07);
  color: var(--text);
  border-radius: 12px;
  padding: 9px 12px;
  font-size: 14px;
  cursor: pointer;
  user-select: none;
}

select { color-scheme: dark; min-width: 170px; }
select option { background-color: #1a1f2c; color: #ffffff; }

button:hover, select:hover { background: rgba(255,255,255,0.10); border-color: rgba(255,255,255,0.22); }
button:active { transform: translateY(0px); }

button.primary {
  background: rgba(139,211,255,0.12);
  border-color: rgba(139,211,255,0.30);
}

button:disabled { opacity: 0.55; cursor: not-allowed; }

.ico { margin-right: 8px; }

.toolrow {
  display: grid;
  gap: 12px;
  margin: 10px 0 12px;
}
@media (min-width: 760px) {
  .toolrow { grid-template-columns: 1fr 1fr; align-items: start; }
}

.toolgroup {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 10px;
  display: grid;
  gap: 10px;
}

.tooltitle { font-size: 12px; color: var(--muted); letter-spacing: 0.2px; }

.tool {
  padding: 8px 10px;
  border-radius: 12px;
  width: 100%;
}
.tool.active {
  border-color: rgba(139,211,255,0.35);
  background: rgba(139,211,255,0.10);
}

/* 2x2 button grids */
.toolgroup.editGrid,
.toolgroup.randGrid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.toolgroup.editGrid .tooltitle,
.toolgroup.randGrid .tooltitle {
  grid-column: 1 / -1;
}
.toolgroup.randGrid .sliderWrap {
  grid-column: 1 / -1;
}

.sliderWrap {
  width: 100%;
  display: grid;
  grid-template-columns: 70px 1fr 70px;
  gap: 10px;
  align-items: center;
}
.sliderLabel, .sliderVal { font-size: 12px; color: var(--muted); }
input[type="range"] { width: 100%; accent-color: var(--accent); }

.toggle {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  padding: 7px 10px;
  border-radius: 12px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--stroke);
  color: rgba(255,255,255,0.86);
  cursor: pointer;
  user-select: none;
}

.toggle input {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  position: relative;
}
.toggle input:checked {
  background: rgba(124,255,178,0.14);
  border-color: rgba(124,255,178,0.35);
}
.toggle input:checked::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 4px;
  background: rgba(124,255,178,0.55);
}

/* action bar near grid */
.actionbar {
  margin: 10px 0 6px;
  padding: 10px;
  border-radius: 16px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,0.04);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

/* board wrap */
.boardWrap { display: grid; place-items: center; padding: 8px 0 4px; }

/* FLAT-TOP HEX BOARD (absolute tiling) */
.board {
  --cell: 26px;
  --w: var(--cell);
  --h: calc(var(--w) * 0.8660254038); /* sqrt(3)/2 * w */
  --xStep: calc(var(--w) * 0.75 + var(--gapX)); /* 3/4 w */
  --yStep: calc(var(--h) + var(--gapY));
  --yOff: calc(var(--h) * 0.5);

  position: relative;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.10);

  width: calc(var(--pad) * 2 + (var(--cols) - 1) * var(--xStep) + var(--w));
  height: calc(var(--pad) * 2 + (var(--rows) - 1) * var(--yStep) + var(--h) + var(--yOff));

  overflow: auto;
  max-width: 92vw;
  max-height: 70vh;

  padding: 0;
  touch-action: none; /* important: painting feels immediate */
}

/* FLAT 2D CELL: border only, no transitions, no per-cell pointer events */
.cell {
  position: absolute;
  left: calc(var(--pad) + var(--c) * var(--xStep));
  top: calc(var(--pad) + var(--r) * var(--yStep) + var(--cOdd) * var(--yOff));

  width: var(--w);
  height: var(--h);
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);

  background: var(--floor);
  border: 1px solid var(--gridline);
  box-shadow: none;
  transition: none;

  display: grid;
  place-items: center;

  font-size: 11px;
  font-weight: 800;

  user-select: none;
  pointer-events: none; /* key performance win */
}

.cell.hover { border-color: rgba(255,255,255,0.35); }

.cell.wall {
  background: var(--wall);
  border-color: rgba(255,255,255,0.10);
}

.cell.start {
  background: hsl(var(--startH) 100% 65% / 0.55);
  border-color: hsl(var(--startH) 100% 80% / 0.60);
}

.cell.goal {
  background: hsl(var(--goalH) 100% 68% / 0.55);
  border-color: hsl(var(--goalH) 100% 80% / 0.60);
}

.cell.open {
  background: var(--open);
  border-color: rgba(139,211,255,0.42);
}

.cell.closed {
  background: var(--closed);
  border-color: rgba(255,139,176,0.34);
}

.cell.path {
  background: var(--path);
  border-color: rgba(124,255,178,0.48);
}

.footer {
  text-align: center;
  color: rgba(255,255,255,0.55);
  font-size: 12px;
  margin-top: 8px;
}

code.inline {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.10);
  color: rgba(255,255,255,0.88);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
}

.legend { display: grid; gap: 8px; margin-top: 12px; }
.legItem { display: flex; align-items: center; gap: 10px; color: rgba(255,255,255,0.86); }

.swatch {
  width: 18px;
  height: 14px;
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.06);
}
.swatch.start { background: hsl(var(--startH) 100% 70% / 0.28); border-color: hsl(var(--startH) 100% 80% / 0.45); }
.swatch.goal  { background: hsl(var(--goalH) 100% 70% / 0.26);  border-color: hsl(var(--goalH) 100% 80% / 0.45); }
.swatch.wall  { background: rgba(0,0,0,0.55); border-color: rgba(255,255,255,0.12); }
.swatch.open  { background: rgba(139,211,255,0.22); border-color: rgba(139,211,255,0.32); }
.swatch.closed{ background: rgba(255,139,176,0.18); border-color: rgba(255,139,176,0.28); }
.swatch.path  { background: rgba(124,255,178,0.22); border-color: rgba(124,255,178,0.38); }

.help { margin-top: 14px; font-size: 13px; color: var(--muted); line-height: 1.45; }

/* Scoreboard */
.score {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 13px;
}
.score th, .score td {
  padding: 8px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.10);
  text-align: left;
}
.score th { color: rgba(255,255,255,0.72); font-weight: 650; }
.score td { color: rgba(255,255,255,0.88); }
.score tr.winRow td { color: rgba(124,255,178,0.92); }

.smallmuted { color: rgba(255,255,255,0.62); font-size: 12px; }

/* Toast (no backdrop blur for speed) */
.toast {
  position: fixed;
  left: 50%;
  top: 14px;
  transform: translateX(-50%);
  background: rgba(10,14,28,0.78);
  border: 1px solid rgba(255,255,255,0.14);
  box-shadow: 0 12px 30px rgba(0,0,0,0.35);
  padding: 10px 12px;
  border-radius: 14px;
  color: rgba(255,255,255,0.92);
  font-size: 13px;
  display: none;
  align-items: center;
  gap: 10px;
  z-index: 9999;
}
.toast.show { display: inline-flex; }
.toast .tDot {
  width: 12px; height: 10px;
  background: var(--accent);
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
}