:root {
  /* Overall: blueish white / cool ice (no purple chrome) */
  --bg: #0b1524;
  --panel: #132536;
  --text: #f2f8ff;
  --muted: #9bb4cb;
  --accent: #9fd6ff;
  --accent2: #5ec8ff;
  --good: #6dffb0;
  --warn: #ffd36b;
  --bad: #ff6b8a;
  /* Board — ice white vs steel blue */
  --light: #e8f4ff;
  --dark: #3a5f86;
  --hi: #5ec8ff66;
  --burbo-crystal: #f4fbff;
  --burbo-glow: #7ad4ff;
  --domilias-red: #c41e3a;
  --domilias-deep: #5a0a18;
  --domilias-silver: #d8dee8;
  /* Discord Activity safe areas (Discord may set these; env() is the fallback). */
  --discord-safe-area-inset-top: env(safe-area-inset-top, 0px);
  --discord-safe-area-inset-right: env(safe-area-inset-right, 0px);
  --discord-safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
  --discord-safe-area-inset-left: env(safe-area-inset-left, 0px);
  --board-size: min(
    560px,
    calc(100vw - 32px - var(--discord-safe-area-inset-left) - var(--discord-safe-area-inset-right)),
    calc(100dvh - 220px - var(--discord-safe-area-inset-top) - var(--discord-safe-area-inset-bottom))
  );
  --square: calc(var(--board-size) / 8);
}
* { box-sizing: border-box; }
html, body {
  height: 100%;
}
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1100px 560px at 8% -8%, #1a4a72 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #0e6a8a 0%, transparent 48%),
    radial-gradient(700px 400px at 50% 100%, #14304a 0%, transparent 50%),
    var(--bg);
  padding-top: var(--discord-safe-area-inset-top);
  padding-right: var(--discord-safe-area-inset-right);
  padding-bottom: var(--discord-safe-area-inset-bottom);
  padding-left: var(--discord-safe-area-inset-left);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
#app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 16px 24px;
  width: 100%;
}
.top h1 {
  margin: 0 0 4px;
  font-size: clamp(1.25rem, 4vw, 1.6rem);
  background: linear-gradient(90deg, #ffffff, var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.muted { color: var(--muted); font-size: 0.9rem; }
.theme-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  margin: 4px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}
.theme-legend .chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #0a1828aa;
  border: 1px solid #3a6a8a66;
}
.theme-legend .swatch {
  width: 0.85em;
  height: 0.85em;
  border-radius: 3px;
  flex: none;
}
.theme-legend .swatch.burbo {
  background: linear-gradient(135deg, #ffffff, var(--burbo-glow));
  box-shadow: 0 0 8px var(--burbo-glow);
}
.theme-legend .swatch.domilias {
  background: linear-gradient(135deg, var(--domilias-deep), var(--domilias-red));
  box-shadow: 0 0 6px #c41e3a88;
}
.controls, .pvp {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: end;
  background: var(--panel); padding: 12px; border-radius: 14px;
  margin: 12px 0; box-shadow: 0 8px 24px #0005;
  border: 1px solid #2a4a6688;
}
label { display: flex; flex-direction: column; gap: 4px; font-size: 0.8rem; color: var(--muted); }
select, input {
  background: #0a1828; color: var(--text); border: 1px solid #3a6a8a;
  border-radius: 8px; padding: 8px 10px; min-width: 120px;
  font-size: 16px; /* avoid iOS zoom on focus */
}
.btn {
  border: 0; border-radius: 10px; padding: 10px 14px; cursor: pointer;
  background: #1e3f5c; color: var(--text); font-weight: 600;
  min-height: 44px;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  position: relative;
  z-index: 2;
  pointer-events: auto;
}
.btn.primary { background: linear-gradient(135deg, #9fd6ff, #3db8ff); color: #0b1524; }
.btn:hover { filter: brightness(1.08); }
.hidden { display: none !important; }
.play {
  display: grid;
  grid-template-columns: var(--board-size) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  justify-content: center;
}
@media (max-width: 800px) {
  .play { grid-template-columns: 1fr; }
  .controls { gap: 8px; }
  select, input { min-width: 0; flex: 1; }
}
.board {
  width: var(--board-size);
  height: var(--board-size);
  flex: none;
  display: grid;
  grid-template-columns: repeat(8, var(--square));
  grid-template-rows: repeat(8, var(--square));
  border-radius: 12px;
  overflow: hidden;
  box-shadow:
    0 12px 40px #0007,
    0 0 0 2px #9fd6ff44,
    inset 0 0 36px #ffffff12;
  user-select: none;
  margin: 0 auto;
  touch-action: manipulation;
}
.sq {
  width: var(--square);
  height: var(--square);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--square) * 0.72);
  line-height: 1;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  flex: none;
  padding: 0;
  margin: 0;
}
.sq.light {
  background:
    linear-gradient(145deg, #ffffff 0%, var(--light) 55%, #cfe6f8 100%);
}
.sq.dark {
  background:
    linear-gradient(145deg, #4f7aa3 0%, var(--dark) 50%, #2c4d6e 100%);
}
.sq.selected { outline: 3px solid var(--accent2); outline-offset: -3px; }
.sq.target::after {
  content: "";
  width: calc(var(--square) * 0.28);
  height: calc(var(--square) * 0.28);
  border-radius: 50%;
  background: #5ec8ff66;
  box-shadow: 0 0 10px #9fd6ff55;
  position: absolute;
}
.sq.last { box-shadow: inset 0 0 0 4px var(--hi); }
.piece {
  display: block;
  pointer-events: none;
  font-weight: 700;
  line-height: 1;
  -webkit-text-stroke: 0;
  transform: translateZ(0);
}
/* Burbo — blueish-white crystal */
.piece.burbo {
  color: #f4fbff;
  text-shadow:
    0 0 2px #ffffff,
    0 0 6px #7ad4ff,
    0 0 12px #9fd6ff99,
    0 1px 0 #d8f0ff,
    0 2px 3px #0b1524cc;
}
/* Domilias — dark red / crimson with silver edge */
.piece.domilias {
  color: #c41e3a;
  text-shadow:
    0 0 1px #d8dee8,
    0 0 4px #c41e3acc,
    0 0 8px #5a0a18,
    0 2px 2px #000c;
}
.coach {
  background: var(--panel); border-radius: 14px; padding: 14px 16px;
  box-shadow: 0 8px 24px #0005;
  border: 1px solid #2a4a6688;
  min-width: 0;
}
.badge {
  display: inline-block; padding: 6px 12px; border-radius: 999px;
  font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em;
  background: #1e3f5c; margin-bottom: 8px;
}
.badge.best, .badge.excellent { background: #1f5f45; color: var(--good); }
.badge.good { background: #1a4560; color: var(--accent2); }
.badge.inaccuracy { background: #5a4a20; color: var(--warn); }
.badge.mistake, .badge.blunder { background: #5a2030; color: var(--bad); }
#move-list { max-height: min(220px, 30vh); overflow: auto; padding-left: 1.2rem; }
.status { font-weight: 600; color: var(--accent2); }

.sq.sim-from { box-shadow: inset 0 0 0 4px #9fd6ffcc; background-image: linear-gradient(145deg, #b8e4ff88, transparent); }
.sq.sim-to { box-shadow: inset 0 0 0 4px #6dffb0cc; background-image: linear-gradient(145deg, #6dffb055, transparent); }
.sim-panel { margin-bottom: 12px; }
.sim-panel ol { margin: 6px 0 0; padding-left: 1.2rem; }
.sim-panel li { margin: 4px 0; }
.sim-eval {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  background: #1e3f5c;
  color: var(--accent2);
  font-size: 0.85em;
  font-weight: 700;
}
.sim-pv { color: var(--muted); font-size: 0.9em; }
#btn-sim:disabled { opacity: 0.55; cursor: wait; }

.sim-editor {
  align-items: start;
}
.sim-help {
  flex: 1 1 100%;
  margin: 0;
}
.piece-palette {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  flex: 1 1 100%;
}
.palette-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px;
  border-radius: 10px;
  background: #0a1828aa;
  border: 1px solid #3a6a8a66;
}
.palette-btn {
  border: 1px solid #3a6a8a88;
  border-radius: 10px;
  background: #132536;
  color: var(--text);
  min-width: 44px;
  min-height: 44px;
  padding: 6px 10px;
  cursor: pointer;
  font-weight: 600;
  touch-action: manipulation;
}
.palette-btn.piece-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.45rem;
  line-height: 1;
}
.palette-btn.active {
  outline: 2px solid var(--accent2);
  outline-offset: 1px;
  background: #1e4a6e;
}
.palette-btn.erase.active {
  outline-color: var(--bad);
  background: #5a2030;
}
.badge.sim { background: #1a4560; color: var(--accent2); }