:root {
    --cell: 50px;
    --gap: 8px;
    --panel-w: 300px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    background: #0f1115;
    color: #eaeef6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app {
    width: min(1100px, 96vw);
    height: min(860px, 92vh);
    /* PCで収める */
    display: grid;
    grid-template-columns: 1fr var(--panel-w);
    gap: 16px;
    align-items: stretch;
}

/* 中央に盤面 */
.stage {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 14px 10px;
    background: rgba(255, 255, 255, .03);
    border: 1px solid rgba(255, 255, 255, .06);
    border-radius: 18px;
    min-height: 0;
    /* 重要：無駄な縦伸びでスクロールしない */
}

.board-wrap {
    padding: 14px;
    border-radius: 18px;
    background: rgba(255, 255, 255, .04);

    /* 盤面の枠：強調 */
    border: 2px solid rgba(255, 255, 255, .18);
    box-shadow:
        0 10px 28px rgba(0, 0, 0, .45),
        inset 0 0 0 2px rgba(255, 255, 255, .05);

    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

/* 盤面（タイル感） */
.board {
    display: grid;
    gap: var(--gap);
    width: fit-content;

    touch-action: none;
    user-select: none;

    position: relative;

    background: rgba(0, 0, 0, .22);
    padding: 6px;
    border-radius: 14px;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .08);
}

/* グリッド線（隙間中心に合わせる：ズレ修正＋強調） */
.board::before {
    content: "";
    position: absolute;
    inset: 6px;
    /* padding分だけ内側に */
    pointer-events: none;
    border-radius: 12px;

    background-image:
        linear-gradient(to right, rgba(255, 255, 255, .22) 0 2px, transparent 2px),
        linear-gradient(to bottom, rgba(255, 255, 255, .22) 0 2px, transparent 2px);

    background-size:
        calc(var(--cell) + var(--gap)) 100%,
        100% calc(var(--cell) + var(--gap));

    background-position:
        calc(var(--cell) + (var(--gap) / 2)) 0,
        0 calc(var(--cell) + (var(--gap) / 2));

    background-repeat: repeat;
    opacity: .85;
}

.cell {
    width: var(--cell);
    height: var(--cell);
    border-radius: 50%;
    background: #2a2f3a;
    box-shadow:
        inset 0 0 0 2px rgba(255, 255, 255, .10),
        0 6px 16px rgba(0, 0, 0, .28);
    cursor: pointer;
    user-select: none;
    touch-action: none;
}

.cell:active {
    transform: translateY(1px);
}

/* 選択中 */
.cell.selected {
    outline: 3px solid rgba(255, 255, 255, .85);
    outline-offset: 2px;
}

/* 再生中 */
.board.replaying {
    opacity: .75;
    pointer-events: none;
}

/* ドロップ色 */
.fire {
    background: radial-gradient(circle at 30% 30%, #ffd1c1, #ff4b2b 65%, #b11200);
}

.water {
    background: radial-gradient(circle at 30% 30%, #d7f1ff, #2a7fff 65%, #083a86);
}

.wood {
    background: radial-gradient(circle at 30% 30%, #ddffd8, #3ac55b 65%, #0f6a23);
}

.dark {
    background: radial-gradient(circle at 30% 30%, #f0d7ff, #7c3aed 65%, #2a0b53);
}

.light {
    background: radial-gradient(circle at 30% 30%, #fff6c7, #f6c92b 65%, #9a6a00);
}

.heal {
    background: radial-gradient(circle at 30% 30%, #ffe0f1, #ff5fa2 65%, #8c1c4a);
}

.empty {
    background: #2a2f3a;
}

/* 回復だけ四角 */
.cell.heal {
    border-radius: 14px;
}

/* 右パネル */
.panel {
    position: sticky;
    top: 10px;
    padding: 12px;
    border-radius: 18px;
    background: rgba(255, 255, 255, .03);
    border: 1px solid rgba(255, 255, 255, .06);
}

.panel h2 {
    margin: 2px 0 8px;
    font-size: 15px;
    font-weight: 700;
}

.section {
    padding: 8px 0 10px;
    border-top: 1px solid rgba(255, 255, 255, .06);
}

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

.row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

button {
    border: 1px solid rgba(255, 255, 255, .12);
    background: rgba(255, 255, 255, .06);
    color: #eaeef6;
    padding: 9px 10px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 650;
    font-size: 14px;
    transition: .15s ease;
}

button:hover {
    background: rgba(255, 255, 255, .10);
}

button.primary {
    background: rgba(255, 255, 255, .16);
    border-color: rgba(255, 255, 255, .22);
}

.chip {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 8px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, .10);
    background: rgba(255, 255, 255, .04);
    cursor: pointer;
    user-select: none;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .15);
}

.muted {
    color: rgba(234, 238, 246, .75);
    font-size: 12px;
    line-height: 1.4;
}

.kpi {
    font-size: 13px;
    text-align: center;
    max-width: 100%;
    white-space: normal;
    word-break: break-word;
    line-height: 1.5;
}

.mt6 {
    margin-top: 6px;
}

@media (max-width: 920px) {
    .app {
        grid-template-columns: 1fr;
        height: auto;
    }

    .panel {
        position: relative;
        top: auto;
    }

    :root {
        --cell: 46px;
        --gap: 7px;
        --panel-w: 1fr;
    }
}

/* ====== Mobile (375px) tuning ====== */
@media (max-width: 420px) {
    :root {
        /* 375pxで盤面がきれいに収まるサイズ */
        --cell: 44px;
        --gap: 6px;
        --panel-w: 1fr;
    }

    body {
        align-items: flex-start;
        /* 上から並べる */
    }

    .app {
        grid-template-columns: 1fr;
        width: 100vw;
        height: auto;
        gap: 12px;
        padding: 12px;
    }

    .stage {
        padding: 12px 8px;
        border-radius: 16px;
    }

    .board-wrap {
        padding: 12px;
        border-radius: 16px;
    }

    .board {
        padding: 6px;
        border-radius: 14px;
    }

    /* グリッド線の見え方調整（スマホは少し細めに） */
    .board::before {
        opacity: .75;
        background-image:
            linear-gradient(to right, rgba(255, 255, 255, .20) 0 1px, transparent 1px),
            linear-gradient(to bottom, rgba(255, 255, 255, .20) 0 1px, transparent 1px);
    }

    .kpi {
        font-size: 12px;
        line-height: 1.45;
    }

    .panel {
        position: relative;
        /* sticky解除 */
        top: auto;
        padding: 12px;
        border-radius: 16px;
    }

    /* ボタンを押しやすく */
    button {
        padding: 10px 12px;
        font-size: 14px;
        border-radius: 14px;
    }

    /* チップ（ランダム色チェック）は2列感に */
    .chip {
        padding: 7px 10px;
    }

    /* “色ボタン”を2〜3列で整列させて見た目を揃える */
    #pen button {
        flex: 1 1 calc(33.333% - 8px);
        /* 3列 */
    }

    #colorChecks label.chip {
        flex: 1 1 calc(50% - 8px);
        /* 2列 */
    }
}

@media (max-width: 420px){
    .stage{
      overflow-x: auto; /* 万が一はみ出しても横スクロールで破綻しない */
    }
  }