/* ダークモードスタイル */
body.dark-mode {
    --color-paper: #1a1a1a;
    --color-paper-dark: #242424;
    --color-ink: #e0e0e0;
    --color-ink-light: #b0b0b0;
    --color-accent: #5d8a76;
    --color-accent-light: #7dad97;
    --color-border: #3a3a3a;
    --color-shadow: rgba(0, 0, 0, 0.3);
    
    background-color: #1a1a1a;
    background-image: 
        linear-gradient(90deg, rgba(58, 58, 58, 0.3) 1px, transparent 1px),
        linear-gradient(rgba(58, 58, 58, 0.3) 1px, transparent 1px);
}

body.dark-mode .paper,
body.dark-mode .card,
body.dark-mode .game-card,
body.dark-mode .fragment-card,
body.dark-mode .site-header,
body.dark-mode .site-footer {
    background: #242424;
    border-color: #3a3a3a;
}

body.dark-mode .hero,
body.dark-mode .page-header,
body.dark-mode .filter-section {
    background: linear-gradient(135deg, #1a1a1a 0%, #242424 100%);
}

/* ダークモード切り替えボタン */
.theme-toggle {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 2px solid var(--color-border);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--color-shadow);
    transition: var(--transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px var(--color-shadow);
}

@media (max-width: 768px) {
    .theme-toggle {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
}