/* 테마 색상 변수 */
        :root {
            --color-primary: #004080;
            --color-primary-light: #0059b3;
            --color-primary-dark: #002a5c;
        }

        [data-theme="teal"] {
            --color-primary: #10828d;
            --color-primary-light: #2ebcc7;
            --color-primary-dark: #0a5259;
        }

        body {
            font-family: 'Noto Sans KR', sans-serif;
            color: #333;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        html {
            scroll-behavior: smooth;
        }

        /* Modal Transitions */
        .modal {
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease-in-out;
            pointer-events: none;
        }

        .modal.active {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
        }

        .modal-content {
            transform: translateY(20px);
            transition: all 0.3s ease-in-out;
        }

        .modal.active .modal-content {
            transform: translateY(0);
        }

        /* Form Wizard Steps */
        .step-content {
            display: none;
        }

        .step-content.active {
            display: block;
            animation: fadeIn 0.4s ease;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Image Placeholder */
        .img-placeholder {
            background-color: #e5e7eb;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #6b7280;
            font-size: 1.25rem;
            font-weight: bold;
            border: 2px dashed #9ca3af;
            position: relative;
            overflow: hidden;
        }

        .img-placeholder::after {
            content: '이미지 영역 (' attr(data-label) ')';
        }

        /* Theme Switcher */
        .theme-switcher {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 9999;
            background: white;
            padding: 10px;
            border-radius: 50px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
            display: flex;
            gap: 10px;
            align-items: center;
            border: 1px solid #ddd;
        }

        .theme-btn {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            cursor: pointer;
            border: 2px solid transparent;
            transition: transform 0.2s;
        }

        .theme-btn:hover {
            transform: scale(1.1);
        }

        .theme-btn.active {
            border-color: #333;
            transform: scale(1.1);
        }

        /* [NEW] Abstract Form Styles */
        .byte-counter {
            font-size: 0.8rem;
            color: #64748b;
            /* text-sub */
            text-align: right;
            margin-top: 0.25rem;
        }

        .byte-counter.error {
            color: #ef4444;
            /* error */
            font-weight: 600;
        }

        .helper-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .char-grid {
            display: grid;
            grid-template-columns: repeat(10, 1fr);
            gap: 0.5rem;
            margin-top: 1rem;
        }

        .char-btn {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            padding: 0.5rem;
            text-align: center;
            cursor: pointer;
            border-radius: 0.25rem;
        }

        .char-btn:hover {
            background: var(--color-primary);
            color: white;
            border-color: var(--color-primary);
        }