/* FFCE Web theme — mirrors the pygame GUI (ui.py).
   Board light (240,235,220) / dark (120,160,130); desktop dark chrome. */
:root {
  --light-sq: rgb(240, 235, 220);
  --dark-sq: rgb(120, 160, 130);
  --select: rgb(235, 200, 80);
  --move: rgb(80, 180, 120);
  --capture: rgb(200, 80, 80);
  --lastmove: rgb(80, 120, 200);
  --check: rgb(220, 60, 60);
  --bg: rgb(20, 20, 20);
  --panel: rgb(22, 22, 22);
  --panel-border: rgb(40, 40, 40);
  --header: rgb(228, 228, 228);
  --text: rgb(200, 200, 200);
  --muted: rgb(150, 150, 150);
  --accent: rgb(120, 200, 130);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, Roboto, sans-serif;
  font-size: 14px;
}

.app {
  display: flex;
  gap: 18px;
  padding: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.left { display: flex; flex-direction: column; }
h1 { font-size: 1.3rem; margin: 4px 0 2px; color: var(--header); }
.subtitle { color: var(--muted); font-size: 0.8rem; margin: 0 0 4px; }
.links { font-size: 0.8rem; margin: 0 0 12px; }
.links a { color: rgb(120, 200, 200); text-decoration: none; }
.links a:hover { text-decoration: underline; }
.links .sep { color: var(--panel-border); margin: 0 6px; }

.board-wrap {
  position: relative;
  width: min(82vw, 560px);
  height: min(82vw, 560px);
}

#board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  height: 100%;
  border: 1px solid var(--panel-border);
}

#overlayCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  overflow: hidden;
}
.cell.light { background: var(--light-sq); }
.cell.dark { background: var(--dark-sq); }

/* Highlights drawn as inset borders / dots like the pygame version. */
.cell.selected { box-shadow: inset 0 0 0 4px var(--select); }
.cell.lastmove { box-shadow: inset 0 0 0 3px var(--lastmove); }
.cell.check { box-shadow: inset 0 0 0 4px var(--check); }
.cell.target::after,
.cell.capture::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 30%; height: 30%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  z-index: 3;
}
.cell.target::after { background: var(--move); }
.cell.capture::after { background: var(--capture); }

.piece {
  width: 90%;
  height: 90%;
  z-index: 2;
  pointer-events: none;
  object-fit: contain;
  /* 16x16 pixel-art sprites: scale up with nearest-neighbor, not blur */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  -ms-interpolation-mode: nearest-neighbor;
}

#turn { font-size: 1rem; font-weight: 600; color: var(--header); margin-top: 12px; }
#status { font-size: 0.9rem; color: var(--accent); min-height: 1.2em; }
.keyhelp { font-size: 0.72rem; color: var(--muted); margin-top: 10px; max-width: 560px; line-height: 1.5; }

/* ---- Right panel -------------------------------------------------------- */
.panel {
  width: 320px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 12px;
}
.section { margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--panel-border); }
.section h2 { font-size: 0.95rem; margin: 0 0 8px; color: var(--header); }
label { display: block; font-size: 0.78rem; color: var(--muted); margin: 8px 0 3px; }
label.check { display: flex; align-items: center; gap: 6px; cursor: pointer; }
select, input[type="range"] { width: 100%; }
select {
  background: rgb(30, 30, 30);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 3px;
  padding: 4px;
}
.ai-mode { font-size: 0.8rem; color: var(--muted); margin-top: 6px; }
button {
  background: rgb(45, 60, 48);
  color: var(--header);
  border: 1px solid var(--panel-border);
  border-radius: 3px;
  padding: 7px 12px;
  cursor: pointer;
}
button:hover { background: rgb(60, 80, 64); }
#newgame { width: 100%; margin-top: 10px; }
#selfplay { width: 100%; margin-top: 8px; }
.credit { font-size: 0.75rem; color: var(--muted); margin-top: 12px; max-width: 560px; line-height: 1.55; border-top: 1px solid var(--panel-border); padding-top: 10px; }
.credit b { color: var(--accent); }

/* ---- Tabs --------------------------------------------------------------- */
.tabs { display: flex; gap: 2px; }
.tab {
  flex: 1;
  background: rgb(28, 28, 28);
  border-radius: 3px 3px 0 0;
  padding: 7px 4px;
  color: var(--muted);
}
.tab.active { background: rgb(38, 44, 38); color: var(--header); border-bottom: 2px solid var(--accent); }
.tabbody {
  border: 1px solid var(--panel-border);
  border-radius: 0 0 4px 4px;
  padding: 10px;
  max-height: 360px;
  overflow-y: auto;
}
.tabpane { display: none; }
.tabpane.active { display: block; }

.extras-buttons { display: flex; gap: 6px; margin-bottom: 10px; }
.extras-buttons button { flex: 1; font-size: 0.78rem; padding: 5px; }

.extra-row { margin-bottom: 9px; }
.extra-head { display: flex; align-items: center; gap: 6px; }
.extra-head input[type="checkbox"] { margin: 0; }
.extra-name {
  flex: 1;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text);
  border-left: 4px solid transparent;
  padding-left: 6px;
}
.extra-name:hover { color: var(--header); text-decoration: underline; }
.extra-val { font-size: 0.72rem; color: var(--muted); min-width: 34px; text-align: right; }
.extra-row input[type="range"] { margin-top: 3px; }

#docText {
  white-space: pre-wrap;
  font-family: "Consolas", monospace;
  font-size: 0.78rem;
  color: var(--text);
  margin-top: 8px;
  line-height: 1.45;
}
.filenote { font-size: 0.8rem; color: var(--muted); line-height: 1.5; }

/* ---- Promotion modal ---------------------------------------------------- */
#promo {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: none; align-items: center; justify-content: center; z-index: 20;
}
#promo.show { display: flex; }
#promo .box { background: var(--panel); border: 1px solid var(--panel-border); padding: 18px; border-radius: 6px; text-align: center; color: var(--header); }
#promo .choices { display: flex; gap: 10px; margin-top: 10px; }
#promo button { width: 52px; height: 52px; font-size: 1.2rem; }