/* ナッツ判定トレーニング（スマホ縦1列。docs/spec.md §6） */
:root {
  --pad: 16px;
  --gap: 6px;
  /* 5枚が横一列に収まる最大の幅（画面幅から計算。PC で大きくなりすぎないよう上限あり） */
  --card-w: min(calc((100vw - 2 * var(--pad) - 4 * var(--gap)) / 5), 120px);
  --felt: #0b5d3b;
  --ink: #1f2328;
  --muted: #57606a;
  --red: #c8102e;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--felt);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

.main {
  max-width: 680px;
  margin: 0 auto;
  padding: 12px var(--pad) calc(150px + env(safe-area-inset-bottom));
}

.status {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  color: rgba(255, 255, 255, 0.8);
  font-size: 15px;
  margin-bottom: 12px;
}

#street {
  color: #fff;
  font-size: 20px;
  font-weight: 700;
}

/* ボード（カード5枚） */
.board {
  display: grid;
  grid-template-columns: repeat(5, var(--card-w));
  gap: var(--gap);
  justify-content: center;
}

.card {
  width: var(--card-w);
  aspect-ratio: 5 / 7;
  background: #fff;
  border-radius: calc(var(--card-w) * 0.1);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1;
  font-weight: 700;
  color: #111;
  user-select: none;
}

.card .rank {
  font-size: calc(var(--card-w) * 0.5);
}

.card .suit {
  font-size: calc(var(--card-w) * 0.45);
  margin-top: calc(var(--card-w) * 0.05);
}

.card.red {
  color: var(--red);
}

.card.empty {
  background: transparent;
  box-shadow: none;
  border: 2px dashed rgba(255, 255, 255, 0.35);
}

/* 答え・ドロー */
.panel {
  background: #fff;
  border-radius: 12px;
  padding: 10px 14px;
  margin-top: 14px;
}

.panel h2 {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 4px;
}

.tier {
  padding: 8px 0;
  border-top: 1px solid #eaeef2;
}

.tier:first-of-type {
  border-top: 0;
}

.tier-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.badge {
  flex: none;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: var(--muted);
  border-radius: 999px;
  padding: 2px 8px;
}

.badge.nuts {
  background: #9a6700;
}

.cat {
  font-size: 18px;
  font-weight: 700;
}

.items {
  font-size: 18px;
  margin-top: 4px;
  overflow-wrap: anywhere;
}

.note {
  font-size: 14px;
  color: var(--muted);
  margin-top: 4px;
}

.none {
  font-size: 18px;
  padding: 8px 0;
}

.red-suit {
  color: var(--red);
}

/* 画面下に固定の操作ボタン */
.controls {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px var(--pad) calc(10px + env(safe-area-inset-bottom));
  background: rgba(6, 36, 23, 0.94);
}

.controls .inner {
  max-width: 680px;
  margin: 0 auto;
}

.controls .row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}

.controls button {
  width: 100%;
  min-height: 52px;
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-size: 17px;
  font-weight: 700;
  touch-action: manipulation;
  cursor: pointer;
}

.reveal {
  background: #fff;
  color: var(--ink);
}

.reveal[aria-expanded="true"] {
  background: #d0d7de;
}

.next {
  background: #f0b429;
  color: var(--ink);
}

.controls button:disabled {
  opacity: 0.5;
}

.item {
  white-space: nowrap;
}