:root {
    --bg-color: #1e1e1e;
    --panel-color: #2d2d2d;
    --sidebar-bg: #252526;
    --text-color: #e0e0e0;
    --accent-color: #007acc;
    --border-color: #444;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    background-color: var(--panel-color);
}

header {
    padding: 0 20px;
    height: 50px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--sidebar-bg);
}

header h1 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 500;
}

main {
    display: flex;
    flex: 1;
    overflow: hidden;
    flex-direction: row; /* デフォルトは横並び（PC） */
}

/* サイドバー（ツール＆パレット） */
.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    flex-shrink: 0;
}

.toolbar-section h3 {
    margin: 0 0 10px 0;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: #888;
    letter-spacing: 0.05em;
}

.tool-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 5px;
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(28px, 1fr));
    gap: 4px;
    margin-top: 10px;
}

/* ボタン・入力要素のスタイル */
button {
    background-color: #3c3c3c;
    border: 1px solid var(--border-color);
    color: white;
    padding: 8px;
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 40px;
    height: 40px;
    font-size: 1.1rem;
}

#preview-canvas {
    width: 100%;
    max-width: 180px; /* サイドバー内に収まるサイズ */
    height: auto; /* アスペクト比維持 */
    image-rendering: pixelated;
    background-color: #fff;
    background-image: 
        linear-gradient(45deg, #ccc 25%, transparent 25%),
        linear-gradient(-45deg, #ccc 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ccc 75%),
        linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 10px 10px;
    border: 1px solid #555;
    display: block;
    margin: 0 auto;
    /* グローバルな canvas { position: absolute } を打ち消す */
    position: static; 
    top: auto;
    left: auto;
}

button:hover {
    background-color: #4d4d4d;
}

button.active {
    background-color: var(--accent-color);
    border-color: #0098ff;
}

input[type="color"] {
    border: none;
    width: 100%;
    height: 40px;
    cursor: pointer;
    background: none;
    padding: 0;
}

select {
    background-color: #3c3c3c;
    color: white;
    border: 1px solid var(--border-color);
    padding: 8px;
    border-radius: 4px;
    width: 100%;
}

.palette-swatch {
    width: 24px;
    height: 24px;
    border: 1px solid #555;
    cursor: pointer;
    border-radius: 3px;
    transition: transform 0.1s;
}

.palette-swatch:hover {
    transform: scale(1.15);
    border-color: #fff;
    z-index: 10;
}

/* プロジェクトスロット用 */
.slot-btn {
    width: 100%;
    aspect-ratio: 1 / 1; /* 正方形 */
    background-color: #333;
    border: 2px solid #555;
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    background-size: contain; /* 画像全体が見えるように */
    background-repeat: no-repeat;
    background-position: center;
    image-rendering: pixelated;
    transition: all 0.2s;
    font-size: 0.9rem;
    color: #888;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.slot-btn:hover {
    border-color: #888;
    color: #fff;
}

.slot-btn.active {
    border-color: var(--accent-color);
    box-shadow: 0 0 5px var(--accent-color);
    color: #fff;
    font-weight: bold;
}

/* データがあるスロットのスタイル */
.slot-btn.has-data {
    color: transparent; 
    background-color: #fff;
    /* 市松模様 */
    background-image: 
        linear-gradient(45deg, #ddd 25%, transparent 25%),
        linear-gradient(-45deg, #ddd 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ddd 75%),
        linear-gradient(-45deg, transparent 75%, #ddd 75%);
    background-size: 10px 10px;
    padding: 0; /* 画像を最大化 */
}

.slot-number {
    position: absolute;
    bottom: 0;
    right: 2px;
    font-size: 0.7rem;
    color: rgba(0,0,0,0.7);
    font-weight: bold;
    text-shadow: 0 0 2px white;
    pointer-events: none;
    display: none; /* デフォルト非表示 */
}

.slot-btn:hover .slot-number {
    display: block; /* ホバー時に番号表示 */
}

.slot-btn.has-data:hover {
    border-color: #fff;
}

.slot-btn.has-data.active {
    border: 2px solid var(--accent-color);
}



#export-btn {
    width: 100%;
    height: auto;
    min-height: 40px;
    background-color: #28a745;
    border-color: #218838;
    margin-top: auto;
    font-size: 0.9rem;
}

#export-btn:hover {
    background-color: #218838;
}

#import-btn {
    width: 100%;
    height: auto;
    min-height: 40px;
    font-size: 0.9rem;
}
#import-btn:hover {
    background-color: #286090 !important;
}

#clear-btn {
    width: 100%;
    height: auto;
    min-height: 40px;
    background-color: #3c3c3c;
    border-color: var(--border-color);
    font-size: 0.9rem;
}

#clear-btn:hover {

    background-color: #c0392b;

    border-color: #a93226;

}



#reset-all-btn {

    width: 100%;

    color: #ccc;

    border: 1px dashed #666;

}



#reset-all-btn:hover {

    background-color: #c0392b !important;

    border-color: #a93226;

    color: white;

}



/* キャンバスエリア */
.canvas-area {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
    background-color: #1e1e1e;
    background-image: 
        linear-gradient(45deg, #252526 25%, transparent 25%),
        linear-gradient(-45deg, #252526 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #252526 75%),
        linear-gradient(-45deg, transparent 75%, #252526 75%);
    background-size: 20px 20px;
    overflow: auto;
}

#canvas-container {
    position: relative;
    box-shadow: 0 0 30px rgba(0,0,0,0.5);
    background-color: #fff;
    image-rendering: pixelated;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    cursor: crosshair;
}

#pixel-canvas {
    z-index: 1;
}

#grid-canvas {
    z-index: 2;
    pointer-events: none; /* グリッドはクリックを透過させる */
}

#cursor-canvas {
    z-index: 3;
    pointer-events: none;
}

footer {
    height: 30px;
    background-color: var(--sidebar-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.75rem;
    flex-shrink: 0;
}

footer a {
    color: #888;
    text-decoration: none;
    transition: color 0.2s;
}

footer a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* Color Picker Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--sidebar-bg);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.6);
    width: 320px;
    max-width: 95vw;
    border: 1px solid var(--border-color);
}

.modal-content h3 {
    margin-top: 0;
    margin-bottom: 20px;
    text-align: left;
    color: #fff;
    font-size: 1rem;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.picker-area {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

#cp-saturation {
    border: 2px solid #111;
    background: #000;
    cursor: crosshair;
    width: 250px;
    height: 250px;
    touch-action: none;
    position: static !important;
    display: block;
    margin: 0 auto;
}

.hue-slider-container {
    width: 100%;
}

.hue-range {
    -webkit-appearance: none;
    width: 100%;
    height: 12px;
    border-radius: 6px;
    outline: none;
    background: linear-gradient(to right, #ff0000 0%, #ffff00 17%, #00ff00 33%, #00ffff 50%, #0000ff 67%, #ff00ff 83%, #ff0000 100%);
    border: 1px solid #111;
}

.hue-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid #000;
    cursor: pointer;
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
}

.picker-controls {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.color-preview {
    display: flex;
    gap: 12px;
    align-items: center;
}

#cp-preview-box {
    width: 48px;
    height: 48px;
    border: 2px solid #111;
    border-radius: 6px;
    flex-shrink: 0;
}

#cp-hex-input {
    flex: 1;
    background-color: #1e1e1e;
    border: 1px solid var(--border-color);
    color: #fff;
    padding: 10px;
    border-radius: 6px;
    text-transform: uppercase;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 5px;
}

.modal-buttons button {
    min-width: 90px;
    height: 38px;
    font-size: 0.85rem;
}

.modal-buttons button#cp-ok {
    background-color: var(--accent-color);
    border: none;
}

.modal-buttons button#cp-ok:hover {
    background-color: #006bb3;
}



/* レスポンシブ対応（スマホ・幅が狭い時） */
@media (max-width: 768px) {
    body {
        height: 100vh;
        height: 100dvh; /* ダイナミックビューポートに対応 */
        overflow: hidden;
    }

    .app-container {
        height: 100vh;
        height: 100dvh;
        min-height: 0;
    }

    main {
        flex-direction: column;
        height: calc(100vh - 80px); /* ヘッダー(50px) + フッター(30px) */
        height: calc(100dvh - 80px);
        overflow: hidden;
    }

    .canvas-area {
        order: 1;
        flex: 0 0 auto; /* 高さは自動だが制限付き */
        height: 45vh; /* 画面の45%を確保 */
        height: 45dvh;
        min-height: 250px;
        padding: 10px;
        overflow: hidden;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: #1e1e1e;
        border-bottom: 1px solid var(--border-color);
    }

    #canvas-container {
        /* 親の高さ(45vh)に収まるように、幅を制限する */
        width: min(100%, 45vh) !important;
        width: min(100%, 45dvh) !important;
        height: auto !important;
        aspect-ratio: 1 / 1;
        /* コンテナサイズを確定させる */
        display: block;
        position: relative;
    }

    #canvas-container canvas {
        width: 100% !important;
        height: 100% !important;
    }

    .sidebar {
        order: 2;
        width: 100%;
        flex: 1; /* 残りのスペースを埋める */
        height: auto;
        overflow-y: auto; /* 内部でスクロール */
        border-right: none;
        border-top: none;
        flex-direction: column; /* ツール類は縦並びに戻すか、あるいは横並びのままセクションを縦に積む */
        padding: 15px;
        /* 画面下部のブラウザUIで隠れないように下部余白を大きくとる */
        padding-bottom: 80px; 
        gap: 15px;
        /* iOSでの慣性スクロール */
        -webkit-overflow-scrolling: touch;
    }

    /* ツール内の要素調整 */
    .tool-group {
        justify-content: flex-start;
    }
}