:root {
            --bg-main: #f8f9fa;
            --card-bg: #ffffff;
            --accent: #7c83fd;
            --accent-light: #e0e7ff; 
            --text-main: #333333;
            --text-sub: #888888;
        }

        body {
            background-color: var(--bg-main);
            color: var(--text-main);
            font-family: 'Zen Kaku Gothic New', sans-serif;
        }

        h1, h2, .font-english {
            font-family: 'Jost', sans-serif;
        }

        /* ログイン画面用 */
        .login-bg {
            background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
        }

        /* ギャラリーカード */
        .goods-card {
            background-color: var(--card-bg);
            transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            cursor: pointer;
            overflow: hidden;
            border-radius: 12px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.03);
            border: 1px solid rgba(0,0,0,0.05);
        }
        
        .goods-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 10px 25px rgba(124, 131, 253, 0.15);
        }

        .goods-image-container {
            position: relative;
            padding-top: 100%;
            overflow: hidden;
            background-color: #f1f1f1;
        }

        .goods-image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .goods-card:hover .goods-image {
            transform: scale(1.05);
        }

        /* タブデザイン */
        .tab-btn {
            transition: all 0.3s;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            color: var(--text-sub);
            background-color: transparent;
        }
        .tab-btn:hover {
            color: var(--text-main);
            background-color: rgba(0,0,0,0.05);
        }
        .tab-btn.active {
            background-color: var(--text-main);
            color: #fff;
            font-weight: 500;
            box-shadow: 0 2px 8px rgba(0,0,0,0.15);
        }

        /* モーダル */
        .modal-overlay {
            background-color: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(8px);
        }

        /* FAB */
        .fab {
            background-color: var(--text-main);
            color: white;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
            transition: transform 0.2s, background-color 0.2s;
        }
        .fab:hover {
            transform: scale(1.05) rotate(90deg);
            background-color: var(--accent);
        }

        /* ローディングスピナー */
        .spinner {
            border: 3px solid rgba(0, 0, 0, 0.1);
            width: 24px;
            height: 24px;
            border-radius: 50%;
            border-left-color: var(--accent);
            animation: spin 1s ease infinite;
        }
        @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

        /* フォーム要素 */
        input, select, textarea {
            transition: border-color 0.2s;
        }
        input:focus, select:focus, textarea:focus {
            border-color: var(--accent) !important;
            outline: none;
            box-shadow: 0 0 0 3px var(--accent-light);
        }