:root {
    --bg-color: #e0e0e0;
    --card-bg: #f3f3f3;
    --accent: #ffe95b;
    --text: #414141;
}

body {
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text);
    font-family: sans-serif;
    overflow-x: hidden;
}

header { text-align: center; padding: 40px 20px; }
header h1 { letter-spacing: 4px; text-transform: uppercase; }

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.art-card {
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    transition: 0.3s;
    border: 1px solid #333;
    box-shadow: 5px 5px 20px #b7b7b7;
    padding: 10px;
}

.art-card:hover {
    transform: translateY(-5px);
    /* border-color: var(--accent); */
}

.img-wrapper img {
    width: 100%;
    aspect-ratio: 1/1;
    object-fit: cover;
    image-rendering: pixelated;
}

.card-info {
    padding: 0px;
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
}

.card-info h3 {
    margin: 4px;
}

.date {
    font-size: 0.75rem;
    color: #777;
    /* margin-top: 5px; */
    display: block;
    text-align: right;
}

/* ビューアー設定 */
#modal-viewer {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.95);
    z-index: 10000;
}

#viewer-container {
    width: 100%; height: 100%;
    overflow: hidden;
    position: relative;
    touch-action: none;
}

canvas {
    image-rendering: pixelated;
    position: absolute;
    transform-origin: 0 0;
    will-change: transform;
}

.close-btn-floating {
    position: fixed;
    top: 25px; right: 25px;
    width: 44px; height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    border: none; color: white;
    font-size: 24px; cursor: pointer;
    z-index: 10001;
    backdrop-filter: blur(4px);
}

.viewer-help {
    position: fixed;
    bottom: 20px; left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.6);
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 12px;
    color: #eee;
    pointer-events: none;
}

.hidden { display: none !important; }

/* ギャラリー下部のボタンエリア */
.footer-actions {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 0; /* 少し余白を広げると落ち着きます */
    display: flex;
    justify-content: center;
    gap: 20px; /* ボタン同士の隙間 */
}

/* 新設：上位階層に戻るボタンのデザイン */
.back-to-home {
    display: inline-block;
    text-decoration: none;
    background: transparent;
    color: var(--text);
    border: 1px solid #333;
    padding: 10px 30px;
    border-radius: 30px;
    font-size: 0.8rem;
    letter-spacing: 2px;
    transition: 0.3s;
}

.back-to-home:hover {
    background: #333;
    color: #fff;
    /* transform: translateY(-2px); */
}

/* 既存の back-to-top も少し微調整（一貫性のため） */
.back-to-top {
    background: var(--card-bg);
    color: var(--text);
    border: 1px solid #333;
    padding: 10px 30px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.8rem;
    letter-spacing: 2px;
    transition: 0.3s;
    box-shadow: 3px 3px 10px #b7b7b7;
}