/* Drop The Cat Solver — cat-solver.sougen.dev の暖色テーマを踏襲 */
:root {
  --bg: #f5ede6;
  --card: #fffdfb;
  --ink: #6b4c46;
  --accent: #e0745f;
  --line: #e8dcd2;
  --cell: 48px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
}
header, footer { text-align: center; padding: 18px 12px 6px; }
footer { padding: 12px; font-size: 12px; opacity: 0.7; }
h1 { margin: 0; font-size: 26px; }
.sub { margin: 6px 0 0; font-size: 13px; opacity: 0.8; }
a { color: var(--accent); }

main { max-width: 760px; margin: 0 auto; padding: 0 12px 24px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 2px 10px rgba(107, 76, 70, 0.06);
  padding: 16px;
  margin: 14px 0;
}
h2 { margin: 0 0 10px; font-size: 16px; }

.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 8px 0; }
label { font-size: 13px; display: inline-flex; gap: 6px; align-items: center; }
select, input[type="number"], button {
  font: inherit;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
input[type="number"] { width: 70px; }
button { cursor: pointer; }
button:disabled { opacity: 0.45; cursor: default; }
#solve { background: var(--accent); color: #fff; border-color: var(--accent); padding: 8px 22px; }
#cancel { background: #b0574a; color: #fff; border-color: #b0574a; }

.cv-drop {
  border: 2px dashed var(--line);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 12px;
  opacity: 0.85;
}
.cv-drop.drag { border-color: var(--accent); background: #fff6f2; }
.cv-size .hint { font-size: 11px; opacity: 0.6; }

textarea {
  width: 100%;
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  resize: vertical;
  background: #fffdf9;
  color: var(--ink);
}
.status { font-size: 13px; min-height: 1.4em; margin-top: 6px; white-space: pre-wrap; }
.status.err { color: #c0392b; }
.status.warn { color: #b06f00; }
.status.ok { color: #2e7d32; }

/* 盤面: 静的グリッド + 絶対配置ピースの2層。ピースは transform 遷移でスライドする。
   セルサイズは JS 実測 px 注入（iOS Safari の aspect-ratio バグ回避） */
#board-wrap { display: flex; justify-content: center; }
.board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(var(--cols, 7), var(--cell));
  grid-auto-rows: var(--cell);
  gap: 3px;
  touch-action: none;
  user-select: none;
  padding: 6px;
  background: #efdfca;
  border-radius: 12px;
}
.cell {
  border-radius: 7px;
  background: #f7ecd9;
}
.cell.wall { background: #8f7ba8; box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.15); }

.piece {
  position: absolute;
  left: 0;
  top: 0;
  transition: transform 0.3s cubic-bezier(0.3, 0.9, 0.35, 1.05), opacity 0.25s;
  will-change: transform;
}
.piece .tile {
  position: absolute;
  width: var(--cell);
  height: var(--cell);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--cell) * 0.62);
  line-height: 1;
}
.piece.cat-piece .tile { box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.12); }
.piece.cat-piece.white-cat .tile { border: 2px solid #d8cfc4; }
.piece.star-piece .tile { background: #f9b64c; }
.piece.blanket-piece .tile { box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.35); }
.piece.blanket-piece.moved .tile { outline: 3px solid var(--accent); outline-offset: -2px; }
.piece .counter {
  position: absolute;
  min-width: calc(var(--cell) * 0.42);
  height: calc(var(--cell) * 0.42);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  border: 2px solid currentColor;
  font-size: calc(var(--cell) * 0.28);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
}
.piece.vanish {
  transform: var(--pos) scale(0.15) !important;
  opacity: 0;
}
.piece.appear-anim { animation: pop 0.45s ease-out; }
@keyframes pop {
  0% { opacity: 0; }
  40% { opacity: 1; }
  100% { opacity: 1; }
}

.boxes { display: flex; gap: 8px; justify-content: center; margin-top: 8px; flex-wrap: wrap; font-size: 12px; }
.box-chip { border: 1px solid var(--line); border-radius: 8px; padding: 4px 8px; background: #fff; }
.box-chip .q { display: inline-block; margin-left: 4px; }
.box-chip .q.used { opacity: 0.35; text-decoration: line-through; }

.controls input[type="range"] { flex: 1; min-width: 120px; }
#step-list {
  max-height: 260px;
  overflow-y: auto;
  font-size: 13px;
  padding-left: 26px;
  margin: 10px 0 0;
}
#step-list li { padding: 2px 4px; border-radius: 6px; cursor: pointer; }
#step-list li.current { background: #fbe6de; font-weight: 600; }
#step-list li .ev { opacity: 0.65; font-size: 12px; }

@media (max-width: 520px) {
  .card { padding: 10px; }
  main { padding: 0 6px 18px; }
}