:root {
  --bg: #f6f3ef;
  --ink: #1f1a17;
  --panel: #ffffff;
  --accent: #d26a2c;
  --back: #f29a2e;
  --red: #d84a4a;
  --blue: #3a6dd8;
  --purple: #7a4ad8;
  --gray: #666666;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: "Noto Sans JP", "Hiragino Kaku Gothic Pro", "Meiryo", sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -10%, #ffe3cf, transparent 60%),
    radial-gradient(1000px 500px at 110% 10%, #e9f1ff, transparent 60%),
    var(--bg);
  color: var(--ink);
}
header { padding: 12px 20px 4px; }
h1 { margin: 0 0 4px; font-size: 20px; letter-spacing: 0.02em; }
.sub { font-size: 12px; color: #5b4f47; }
main { padding: 10px 18px 18px; display: grid; gap: 10px; }
.row { display: grid; gap: 8px; }
.panel {
  background: rgba(255,255,255,0.9);
  border: 1px solid #efe3da;
  border-radius: 14px;
  padding: 10px 12px;
  box-shadow: 0 10px 22px rgba(15, 10, 7, 0.08);
  backdrop-filter: blur(4px);
}
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.toggle {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff3e8; border: 1px solid #f1e2d6; padding: 6px 10px; border-radius: 999px;
  font-size: 13px; color: #4b3b30;
}
.toggle input { transform: translateY(1px); }
.prompt {
  display: none; align-items: center; gap: 8px; padding: 6px 10px;
  background: #fff0e0; border: 1px solid #f2d5bf; border-radius: 10px;
  font-size: 13px; color: #6a3d1f;
}
.prompt.show { display: inline-flex; }
.yaku {
  margin-top: 6px; font-size: 13px; color: #4b3b30;
  background: #fff7ef; border: 1px solid #f1e2d6; padding: 6px 10px; border-radius: 10px;
  display: inline-block;
}
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.45);
  display: none; align-items: center; justify-content: center; padding: 20px;
}
.modal.show { display: flex; }
.modal-card {
  background: #fffaf6; border: 2px solid #f0e6df; border-radius: 16px; padding: 14px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.18); width: min(1400px, 98vw);
}
.modal-title { font-weight: 900; margin-bottom: 8px; }
.modal-section { margin-top: 10px; }
.modal-tiles { display: flex; gap: 6px; flex-wrap: nowrap; overflow-x: hidden; padding-bottom: 4px; }
.debug-menu { margin-top: 8px; }
.debug-menu summary { cursor: pointer; font-weight: 800; }
.debug-menu .controls { margin-top: 8px; }
.modal-actions { margin-top: 14px; display: flex; justify-content: flex-end; }
button {
  background: #201a18; color: white; border: 0; padding: 6px 10px; border-radius: 10px;
  cursor: pointer; font-weight: 700; letter-spacing: 0.02em; font-size: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.12);
}
button.secondary { background: #f1e2d6; color: #4b3b30; }
button:disabled { opacity: 0.45; cursor: not-allowed; }
.status { font-size: 12px; color: #5b4f47; }
.area-title { font-weight: 800; margin-bottom: 4px; font-size: 13px; }
.hand, .river { display: flex; flex-wrap: wrap; gap: 6px; }
.river { min-height: 92px; align-content: flex-start; }
.hand.small .tile { width: 50px; height: 70px; }
.kan-area, .pon-area { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; }
.tile {
  width: 62px; height: 86px; padding: 6px 6px; border-radius: 12px; color: white;
  font-weight: 800; cursor: pointer; user-select: none; border: 2px solid rgba(0,0,0,0.08);
  transition: transform 120ms ease, box-shadow 120ms ease;
  display: flex; align-items: center; justify-content: center;
  writing-mode: vertical-rl; text-orientation: upright; letter-spacing: 0.08em;
  position: relative;
}
.tile.nolabel { color: transparent; text-shadow: none; }
.tile:hover { transform: translateY(-2px); box-shadow: 0 6px 12px rgba(0,0,0,0.14); }
.tile.drawn { outline: 3px solid #ffe08a; box-shadow: 0 0 0 3px rgba(255,224,138,0.4); }
.hand .tile.drawn { margin-left: 10px; }
.tile.red { background: var(--red); }
.tile.blue { background: var(--blue); }
.tile.purple { background: var(--purple); }
.tile.gray { background: var(--gray); }
.tile.back { background: var(--back); }
.tile.placeholder {
  background: transparent; border: 2px dashed #e0d6cf; color: transparent;
  box-shadow: none; cursor: default;
}
.tile.pon { box-shadow: inset 0 0 0 2px #ffe08a; }
.tile.kan { box-shadow: inset 0 0 0 2px #8ad4ff; }
.tile.pon::after,
.tile.kan::after {
  position: absolute; top: 2px; left: 4px; font-size: 10px; font-weight: 900;
  background: rgba(255,255,255,0.85); color: #3b2a20; padding: 1px 3px; border-radius: 6px;
}
.tile.pon::after { content: "ポ"; }
.tile.kan::after { content: "カ"; }
.pile { display: flex; align-items: center; gap: 10px; }
.count { font-weight: 800; }
.log { font-size: 12px; line-height: 1.4; max-height: 84px; overflow: auto; }
.badge { background: #f6eee7; padding: 2px 8px; border-radius: 999px; font-size: 12px; }
.active { outline: 3px solid #ffd1a3; }
@media (max-width: 720px) {
  .tile { width: 60px; height: 86px; }
  main { padding: 12px; }
}