/* ───────────────────────────────────────────────────────────────
   checkers.css : チェッカー（ドラフツ）
   scope: .game-checkers
   ─────────────────────────────────────────────────────────────── */

.game-checkers {
    --ck-light: #f1d2a4;
    --ck-dark: #8b5a2b;
    --ck-frame: #5b3920;
    --ck-red: #dc2626;
    --ck-red-dark: #991b1b;
    --ck-black: #1f2937;
    --ck-black-dark: #0b0f17;
    --ck-target: rgba(34, 197, 94, 0.55);
    --ck-selected: rgba(250, 204, 21, 0.85);
}

/* 自分マーカー（赤/黒） */
.game-checkers .ck-you-badge {
    font-size: 13px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--surface);
}
.game-checkers .ck-you-badge.red {
    color: white;
    background: var(--ck-red);
}
.game-checkers .ck-you-badge.black {
    color: white;
    background: var(--ck-black);
}
.game-checkers .ck-you-badge.none {
    color: var(--text-muted);
}

/* 盤 */
.game-checkers .ck-board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-auto-rows: 1fr;
    width: var(--board-max);
    max-width: 100%;
    aspect-ratio: 1 / 1;
    gap: 0;
    padding: 8px;
    background: var(--ck-frame);
    border-radius: var(--r-lg);
    box-shadow:
        var(--sh-md),
        inset 0 2px 8px rgba(0, 0, 0, 0.4);
    align-self: center;
}

.game-checkers .ck-cell {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition:
        box-shadow 0.15s ease,
        background 0.15s ease;
}

.game-checkers .ck-cell.light {
    background: var(--ck-light);
}
.game-checkers .ck-cell.dark {
    background: var(--ck-dark);
}

.game-checkers .ck-cell.clickable {
    cursor: pointer;
}

.game-checkers .ck-cell.selected {
    box-shadow: inset 0 0 0 3px var(--ck-selected);
}

.game-checkers .ck-cell.target::after {
    content: "";
    position: absolute;
    width: 36%;
    height: 36%;
    border-radius: 50%;
    background: var(--ck-target);
    box-shadow: 0 0 8px rgba(34, 197, 94, 0.55);
    animation: ck-target-pulse 1.2s ease-in-out infinite;
}

@keyframes ck-target-pulse {
    0%,
    100% {
        opacity: 0.85;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.08);
    }
}

/* 駒 */
.game-checkers .ck-piece {
    width: 76%;
    height: 76%;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.95);
    font-size: clamp(16px, 4vmin, 24px);
    line-height: 1;
    z-index: 1;
    animation: ck-place 0.22s var(--ease-pop);
    box-shadow:
        inset 0 -3px 5px rgba(0, 0, 0, 0.45),
        inset 0 3px 5px rgba(255, 255, 255, 0.22),
        0 2px 4px rgba(0, 0, 0, 0.4);
}

.game-checkers .ck-piece.red {
    background: radial-gradient(
        circle at 35% 30%,
        #fca5a5,
        var(--ck-red) 50%,
        var(--ck-red-dark) 100%
    );
}

.game-checkers .ck-piece.black {
    background: radial-gradient(
        circle at 35% 30%,
        #4b5563,
        var(--ck-black) 55%,
        var(--ck-black-dark) 100%
    );
}

.game-checkers .ck-piece.king {
    box-shadow:
        inset 0 -3px 5px rgba(0, 0, 0, 0.45),
        inset 0 3px 5px rgba(255, 255, 255, 0.32),
        0 0 0 2px rgba(250, 204, 21, 0.85),
        0 2px 6px rgba(0, 0, 0, 0.45);
}

@keyframes ck-place {
    0% {
        opacity: 0;
        transform: scale(0.5);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}