/* --- reversi --- */
.reversi-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.reversi-container.hidden {
  display: none;
}

.reversi-score {
  display: flex;
  gap: 12px;
  align-items: center;
}
.reversi-score-chip {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  border-radius: 3px;
  border: 1px solid var(--shop-paper-line);
  color: var(--shop-ink);
  font-family: var(--shop-font-display);
  font-weight: 600;
  letter-spacing: 0.06em;
  opacity: 0.55;
  transition: opacity 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
/* whose turn it is, marked in brass rather than the dark UI's blue */
.reversi-score-chip.active {
  opacity: 1;
  border-color: var(--shop-brass);
  background: rgba(180, 144, 63, 0.16);
}
/* 始まる前は数取りの札の場所に席の札を並べる。石の色の代わりに名と席の様子
   (ホスト・CPU・準備・募集中)。自分の札は破線、空席は薄墨の破線。 */
.reversi-seat-chip {
  flex-direction: column;
  gap: 2px;
  padding: 6px 16px 5px;
  opacity: 1;
  background: var(--shop-paper-light);
}
.reversi-seat-chip.self { border: 1px dashed var(--shop-brass-deep); }
.reversi-seat-chip.empty {
  border: 1.5px dashed rgba(138, 106, 26, 0.55);
  background: rgba(247, 241, 225, 0.7);
}
.reversi-seat-name { font-size: 0.9rem; }
.reversi-seat-chip.empty .reversi-seat-name {
  color: #6f6453;
  letter-spacing: 0.2em;
}
.reversi-seat-status {
  font-family: var(--shop-font-body);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--shop-ink-soft);
}
.reversi-seat-chip.empty .reversi-seat-status { color: #6f6453; }

/* 始まる前 ―― 盤の下に、卓が何を待っているかを書く(札の卓の配る前の見出しと
   同じ組み)。 */
.reversi-waiting {
  max-width: 440px;
  margin-top: 6px;
  text-align: center;
}
.reversi-waiting.hidden { display: none; }
.reversi-waiting-title {
  margin: 0;
  font-family: var(--shop-font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.1em;
  color: var(--shop-ink);
}
.reversi-waiting-note {
  margin: 8px 0 0;
  white-space: pre-line;
  font-size: 0.85rem;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--shop-ink-soft);
}
@media (max-width: 520px) {
  .reversi-waiting-title { font-size: 1.05rem; }
}

/* 数取りの石は盤の石と同じ地。小さいので面取りだけ借りる。 */
.reversi-score-disc {
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
}
.reversi-score-disc.black {
  background: var(--reversi-black);
  box-shadow: var(--reversi-black-bevel);
}
.reversi-score-disc.white {
  background: var(--reversi-white);
  box-shadow: var(--reversi-white-bevel);
}

/* 盤は将棋と同じ胡桃の枠に納め、枠の内側に筋と段を彫る。 */
.reversi-board-outer {
  display: grid;
  grid-template-columns: 14px auto;
  grid-template-rows: 13px auto;
  gap: 4px;
  padding: 12px 14px 14px;
  background: linear-gradient(158deg, var(--reversi-frame-a), var(--reversi-frame-b));
  border-radius: 4px;
  box-shadow:
    0 1px 0 var(--reversi-frame-sheen) inset,
    0 14px 26px var(--reversi-frame-drop),
    0 3px 0 var(--reversi-frame-edge);
}
.reversi-coord-top {
  grid-column: 2;
  grid-row: 1;
  display: grid;
  grid-template-columns: repeat(8, 46px);
  gap: 2px;
}
.reversi-coord-side {
  grid-column: 1;
  grid-row: 2;
  display: grid;
  grid-template-rows: repeat(8, 46px);
  gap: 2px;
}
.reversi-coord-top span,
.reversi-coord-side span {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--shop-font-display);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--reversi-coord);
}

/* 羅紗は盤そのものに張り、マスは透かしておく。マスごとに塗ると毛並みと
   照りがマスの数だけ繰り返して、市松に見えてしまうため。罫はマスの隙間
   (2px)に落ちる。 */
.reversi-board {
  grid-column: 2;
  grid-row: 2;
  position: relative;
  display: grid;
  grid-template-columns: repeat(8, 46px);
  grid-template-rows: repeat(8, 46px);
  gap: 2px;
  background:
    repeating-linear-gradient(90deg, transparent 0 46px, var(--reversi-line) 46px 48px),
    repeating-linear-gradient(180deg, transparent 0 46px, var(--reversi-line) 46px 48px),
    var(--reversi-felt-nap),
    var(--reversi-felt-sheen),
    linear-gradient(170deg, var(--reversi-felt-a) 0%, var(--reversi-felt-b) 100%);
  box-shadow: 0 0 0 2px var(--reversi-line);
}
/* 打ち星。二筋・六筋と二段・六段が交わる四点、罫の真上に打つ。 */
.reversi-board::before {
  content: '';
  position: absolute;
  left: 95px;
  top: 95px;
  width: 6px;
  height: 6px;
  margin: -3px 0 0 -3px;
  border-radius: 999px;
  background: var(--reversi-star);
  box-shadow:
    192px 0 0 var(--reversi-star),
    0 192px 0 var(--reversi-star),
    192px 192px 0 var(--reversi-star);
  pointer-events: none;
}

.reversi-cell {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
}
.reversi-cell:hover {
  background: var(--reversi-felt-hover);
}
/* 置ける場所は塗りの点ではなく細い輪。石と同じ大きさの点が脈打つと、
   どれが石でどれが目印か一瞬迷うため。 */
.reversi-cell.legal-move::after {
  content: '';
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 1.5px solid var(--reversi-legal);
  animation: reversiPulse 1.8s ease-in-out infinite;
}
@keyframes reversiPulse {
  0%, 100% { opacity: 0.9; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(1.12); }
}

/* 石は蛤(白)と那智黒(黒)。縁を落として天を光らせ、盤から起き上がらせる。 */
.reversi-disc {
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
}
.reversi-disc.black {
  background: var(--reversi-black);
  box-shadow: var(--reversi-black-bevel), var(--reversi-black-shadow);
}
.reversi-disc.white {
  background: var(--reversi-white);
  box-shadow: var(--reversi-white-bevel), var(--reversi-white-shadow);
}
.reversi-disc.last-move {
  outline: 2px solid var(--reversi-last);
  outline-offset: 3px;
  animation: reversiDrop 0.25s ease-out;
}
.reversi-disc.flipped {
  animation: reversiFlip 0.35s ease-in-out;
}
@keyframes reversiDrop {
  0% { transform: scale(0.3); opacity: 0; }
  60% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(1); }
}
@keyframes reversiFlip {
  0% { transform: scaleX(1); }
  50% { transform: scaleX(0.05); }
  100% { transform: scaleX(1); }
}