/* ───────────────────────────────────────────────────────────────
   chess.css : チェス
   scope: .game-chess
   ─────────────────────────────────────────────────────────────── */

.game-chess {
    --chess-light: #f3e2b4;
    --chess-dark: #8f5d3b;
    --chess-frame: #2c1810;
    --chess-frame-2: #4a2c1a;
    --chess-selected: #ffb703;
    --chess-quiet: rgba(80, 190, 120, 0.82);
    --chess-capture: rgba(220, 68, 55, 0.9);
}

.game-chess.chess-shell {
    display: grid;
    gap: 16px;
}

/* サマリチップ（白の手番 / 黒の手番 等） */
.game-chess .chess-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.game-chess .chess-chip {
    background: var(--surface-soft);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    padding: 10px 14px;
    min-width: 112px;
    box-shadow: var(--sh-sm);
}

.game-chess .chess-chip-label {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 600;
}

.game-chess .chess-chip-value {
    display: block;
    font-weight: 800;
    margin-top: 4px;
    color: var(--text);
    font-size: 14px;
}

/* 盤 */
.game-chess .chess-board {
    width: var(--board-max);
    max-width: 100%;
    align-self: center;
    margin: 0 auto;
}

.game-chess .chess-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    border-radius: var(--r-lg);
    overflow: hidden;
    box-shadow:
        var(--sh-md),
        inset 0 0 0 4px var(--chess-frame),
        inset 0 0 0 6px var(--chess-frame-2);
    padding: 6px;
    background: var(--chess-frame);
}

.game-chess .chess-square {
    aspect-ratio: 1;
    border: 0;
    display: grid;
    place-items: center;
    cursor: pointer;
    padding: 0;
    transition:
        transform 0.12s var(--ease-pop),
        box-shadow 0.12s ease,
        filter 0.12s ease;
}

.game-chess .chess-square.light {
    background: var(--chess-light);
}
.game-chess .chess-square.dark {
    background: var(--chess-dark);
}

.game-chess .chess-square.selected {
    outline: 4px solid var(--chess-selected);
    outline-offset: -4px;
}

.game-chess .chess-square.target {
    position: relative;
}

.game-chess .chess-square.quiet-target::after {
    content: "";
    width: 24%;
    height: 24%;
    border-radius: 999px;
    background: var(--chess-quiet);
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.14);
    animation: chess-target-pulse 1.1s ease-in-out infinite;
}

.game-chess .chess-square.capture-target::after {
    content: "";
    position: absolute;
    inset: 10%;
    border-radius: 999px;
    border: 4px solid var(--chess-capture);
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.1);
    animation: chess-capture-pulse 1.1s ease-in-out infinite;
}

.game-chess .chess-square.target:hover {
    transform: scale(1.04);
    box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.25);
    filter: brightness(1.06);
}

.game-chess .chess-square.capture-target:hover {
    box-shadow: inset 0 0 0 3px rgba(220, 68, 55, 0.4);
}

@keyframes chess-target-pulse {
    0%,
    100% {
        transform: scale(0.9);
        opacity: 0.78;
    }
    50% {
        transform: scale(1.1);
        opacity: 1;
    }
}

@keyframes chess-capture-pulse {
    0%,
    100% {
        transform: scale(0.96);
        opacity: 0.82;
    }
    50% {
        transform: scale(1.02);
        opacity: 1;
    }
}

.game-chess .chess-piece {
    font-size: clamp(28px, 8vmin, 48px);
    line-height: 1;
    user-select: none;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.25));
}

.game-chess .chess-error {
    background: var(--error-soft);
    border: 1px solid #fca5a5;
    color: var(--error);
    border-radius: var(--r-sm);
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 600;
}

@media (max-width: 640px) {
    .game-chess.chess-shell {
        gap: 10px;
    }
    .game-chess .chess-chip {
        min-width: 96px;
        padding: 8px 10px;
    }
}