:root {
    --bg-color: #f5f5f7;
    --text-color: #1d1d1f;
    --panel-bg: rgba(255, 255, 255, 0.9);
    --panel-border: rgba(0, 0, 0, 0.1);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --btn-bg: #ffffff;
    --btn-hover: #f5f5f5;
    --btn-active: #e5e5e5;
    --btn-text: #1d1d1f;
    --btn-border: #d2d2d7;
    --accent-color: #0071e3;
    --accent-text: #ffffff;
    --danger-color: #ff3b30;
    --success-color: #34c759;
}

[data-theme="dark"] {
    --bg-color: #1c1c1e;
    --text-color: #f5f5f7;
    --panel-bg: rgba(44, 44, 46, 0.9);
    --panel-border: rgba(255, 255, 255, 0.15);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --btn-bg: #2c2c2e;
    --btn-hover: #3a3a3c;
    --btn-active: #48484a;
    --btn-text: #f5f5f7;
    --btn-border: #5c5c5e;
    --accent-color: #0a84ff;
}

[data-theme="dark"] #btn-start-challenge:hover:not(:disabled), 
[data-theme="dark"] #btn-next:hover:not(:disabled), 
[data-theme="dark"] .primary-btn:hover:not(:disabled) { 
    background: #0066cc; 
}

body, html {
    margin: 0; padding: 0; width: 100%; height: 100%;
    overflow: hidden; background-color: var(--bg-color);
    color: var(--text-color); font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", sans-serif;
    user-select: none;
    /* スマホ対応: スクロールやズームを防止（ただしボタンは除外） */
    touch-action: manipulation;
}
canvas { 
    display: block; outline: none;
    touch-action: none;
}
button, input {
    touch-action: manipulation;
}

.ui-layer {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    padding: 20px; box-sizing: border-box;
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto 1fr;
    gap: 12px; pointer-events: none;
    z-index: 10;
}

.top-bar { 
    grid-column: 1; align-self: start; 
    display: flex; gap: 12px; align-items: center; pointer-events: auto;
}
.center-panel { grid-column: 2; justify-self: center; align-self: start; }
.right-area { 
    grid-column: 3; grid-row: 1 / span 2; 
    justify-self: end; align-self: start;
    /* column を column-reverse に変更して、PC表示での上下を入れ替える */
    display: flex; flex-direction: column-reverse; gap: 12px; align-items: flex-end;
}
.controls {
    display: flex;
    flex-direction: column-reverse;
    gap: 12px;
    align-items: flex-end;
}
.status-bar, .challenge-panel, .control-group {
    pointer-events: auto; background: var(--panel-bg);
    border: 1px solid var(--panel-border); padding: 10px 16px;
    border-radius: 12px; box-shadow: var(--shadow);
    backdrop-filter: blur(12px); display: flex; align-items: center; gap: 12px;
}

.control-group {
    flex-wrap: wrap;
    justify-content: flex-end;
}

.app-title { font-weight: 800; font-size: 1.2rem; letter-spacing: -0.5px; opacity: 0.8; }

.target-container {
    display: flex; flex-direction: column; gap: 8px; align-items: center;
    pointer-events: auto;
}

.target-window {
    width: 240px; height: 240px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
    display: flex; justify-content: center; align-items: center;
    overflow: hidden;
}

/* 追加: スマホ版などでコンテナが小さくなった際にCanvasも追従させる */
#targetCanvas {
    width: 100%;
    height: 100%;
}

.target-caption {
    font-size: 0.75rem; color: var(--text-color); opacity: 0.6;
    text-align: center; line-height: 1.4; max-width: 240px;
    background: var(--panel-bg); padding: 6px 10px;
    border-radius: 8px; border: 1px solid var(--panel-border);
}

.replay-controls {
    display: flex; align-items: center; gap: 8px;
    background: var(--panel-bg); padding: 4px 12px;
    border-radius: 20px; border: 1px solid var(--panel-border);
    box-shadow: var(--shadow);
}
.sm-btn { padding: 2px 8px; font-size: 0.8rem; min-width: 24px; }
#replay-step-text { font-size: 0.8rem; font-weight: bold; min-width: 40px; text-align: center; }

input[type="number"] {
    background: var(--bg-color); border: 1px solid var(--btn-border);
    color: var(--text-color); padding: 6px; border-radius: 6px; width: 44px; text-align: center;
}
button {
    background: var(--btn-bg); border: 1px solid var(--btn-border); color: var(--btn-text);
    padding: 6px 14px; border-radius: 8px; cursor: pointer; font-weight: 500; font-size: 0.9rem;
    font-family: inherit;
    white-space: nowrap;
    flex-shrink: 0;
    /* Safari用のタップハイライトとタップ改善 */
    -webkit-tap-highlight-color: rgba(0, 113, 227, 0.3);
    -webkit-user-select: none;
    user-select: none;
    /* タップ領域を確保 */
    min-height: 36px;
    position: relative;
}
/* タップ領域を拡大する疑似要素（トグルボタンとアイコンボタンは除外） */
button:not(#btn-toggle-controls):not(.icon-btn)::before {
    content: '';
    position: absolute;
    top: -8px;
    left: -8px;
    right: -8px;
    bottom: -8px;
    z-index: -1;
}
button:hover:not(:disabled) { background: var(--btn-hover); transform: translateY(-1px); }
button:active:not(:disabled) { background: var(--btn-active); transform: translateY(0); }
button:disabled { opacity: 0.4; cursor: not-allowed; }

button[data-key] {
    position: relative;
    padding-right: 32px; /* バッジの分だけ右余白を空ける */
}
button[data-key]::after {
    content: attr(data-key);
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.7rem;
    font-weight: bold;
    font-family: monospace;
    opacity: 0.6;
    border: 1px solid currentColor; /* 文字色と同じ枠線 */
    border-radius: 4px;
    padding: 1px 5px;
    line-height: 1;
}

.icon-btn {
    width: 32px; height: 32px; padding: 0; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: bold;
}

#btn-start-challenge, #btn-next, .primary-btn { background: var(--accent-color); color: var(--accent-text); border-color: var(--accent-color); }
#btn-start-challenge:hover:not(:disabled), #btn-next:hover:not(:disabled), .primary-btn:hover:not(:disabled) { 
    background: #005bb5; 
    transform: translateY(-1px); 
}
#btn-giveup, #btn-quit-challenge, #btn-quit-verification { color: var(--danger-color); }
.status-success { color: var(--success-color); font-weight: bold; }
.status-fail { color: var(--danger-color); font-weight: bold; }
.divider { width: 1px; height: 16px; background: var(--btn-border); margin: 0 4px; }

/* モーダル */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.4); z-index: 100;
    display: flex; justify-content: center; align-items: center;
    backdrop-filter: blur(4px); pointer-events: auto;
}
.modal-content {
    background: var(--bg-color); color: var(--text-color);
    padding: 30px; border-radius: 20px; max-width: 400px; width: 90%;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    border: 1px solid var(--panel-border);
}
.modal-content h2 { margin-top: 0; border-bottom: 2px solid var(--btn-border); padding-bottom: 10px; }
.modal-content h3 { margin-bottom: 5px; color: var(--accent-color); }
.help-list { padding-left: 20px; line-height: 1.6; font-size: 0.95rem; }
.help-list li { margin-bottom: 8px; }

/* =========================================
   スマホ (幅600px以下) 対応スタイル
   PCのスタイルを上書きしてレイアウトを変更
   ========================================= */
@media (max-width: 600px) {
    .ui-layer {
        display: flex;
        flex-direction: column;
        padding: 8px; /* パディング削減 */
        height: 100%; 
        box-sizing: border-box;
        
    }

    /* 上部バー */
    .top-bar {
        width: 100%;
        justify-content: space-between;
        margin-bottom: 4px;
        flex-shrink: 0;
    }

    /* ステータス表示 */
    .center-panel {
        width: 100%;
        display: flex; justify-content: center;
        order: 2;
        margin-bottom: 4px;
        flex-shrink: 0;
    }
    .challenge-panel {
        width: 100%;
        justify-content: space-between;
        box-sizing: border-box;
        padding: 6px 12px; /* 少し小さく */
    }

    /* 右エリア（メインコンテナ） */
    .right-area {
        width: 100%;
        flex-grow: 1;
        order: 3;
        display: flex;
        flex-direction: column;
        justify-content: space-between; 
        align-items: center;
        pointer-events: none;
        position: relative;
    }

    /* --- お手本ウィンドウ --- */
    .target-container {
        pointer-events: auto;
        position: relative; 
        align-self: flex-end;
        margin-right: 0;
        margin-top: 10px;
        z-index: 20;
        flex-shrink: 0;
    }
    .target-window {
        width: 100px; height: 100px;
        /* ★修正: テーマ変数を使用してダークモード対応 */
        background: var(--panel-bg);
        backdrop-filter: blur(12px);
        border-radius: 8px;
    }
    .target-caption { display: none !important; }

    /* --- 操作パネル群（画面最下部へ固定） --- */
    .controls {
        /* position: fixed にして画面下部に張り付かせる */
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        
        display: flex; flex-direction: column;
        align-items: center;
        pointer-events: auto;
        z-index: 100;
        
        background: var(--panel-bg);
        border-top: 1px solid var(--panel-border);
        backdrop-filter: blur(20px);
        box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
        
        padding: 10px 10px 20px 10px; /* 下部にiPhoneのホームバー用余白 */
        box-sizing: border-box;

        transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }
    
    .control-group {
        pointer-events: auto;
    }
    
    /* 隠すとき: 自分の高さ分だけ下へスライド */
    .controls.hidden {
        transform: translateY(100%); 
    }

    /* --- 表示切り替えボタン（タブ型に変更） --- */
    #btn-toggle-controls {
        display: flex !important;
        justify-content: center;
        align-items: center;
        
        /* コントロールパネルの上部にくっつける */
        position: absolute;
        top: -32px; /* ボタンの高さ分外に出す */
        right: 16px;
        
        width: 48px; height: 32px;
        border-radius: 8px 8px 0 0; /* 上側だけ丸くしてタブっぽく */
        border-bottom: none;
        
        background: var(--panel-bg);
        border: 1px solid var(--panel-border);
        border-bottom: 1px solid var(--panel-bg); /* 下線を消して一体化 */
        color: var(--text-color);
        box-shadow: 0 -4px 10px rgba(0,0,0,0.05);
        
        padding: 0;
        cursor: pointer;
    }

    /* 矢印アイコン（CSS描画） */
    #btn-toggle-controls::after {
        content: '';
        display: block;
        width: 8px; height: 8px;
        border-bottom: 2px solid currentColor;
        border-right: 2px solid currentColor;
        transform: rotate(45deg) translateY(-2px); /* 下向き */
        transition: transform 0.3s ease;
    }
    
    /* 閉じている時は上向き */
    #btn-toggle-controls.closed::after {
        transform: rotate(-135deg) translateY(-2px);
    }

    /* --- ボタン群のコンパクト化 --- */
    .control-group {
        width: 100%;
        justify-content: center;
        gap: 6px; /* 間隔を詰める */
        flex-wrap: wrap;
        box-shadow: none; /* パネル自体に背景があるので影削除 */
        background: transparent;
        border: none;
        padding: 0;
        margin: 0;
    }
    
    /* ボタンサイズ縮小 */
    button {
        height: 36px; /* 44px -> 36px */
        min-width: 36px;
        font-size: 0.85rem;
        padding: 0 10px;
        border-radius: 6px;
    }
    
    input[type="number"] {
        height: 36px;
        width: 44px;
        font-size: 0.9rem;
    }
    
    /* スマホでは不要な装飾削除 */
    button[data-key] { padding-right: 10px; }
    button[data-key]::after { display: none; }
    .divider { display: none; }
}