:root {
            --bg-primary: #ffffff;
            --bg-secondary: #f8fafc;
            --bg-card: #ffffff;
            --bg-input: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border-color: rgba(0,0,0,0.08);
            --border-hover: rgba(0,0,0,0.15);
            --accent: #0d9488;
            --accent-light: #14b8a6;
            --accent-glow: rgba(13,148,136,0.15);
            --shadow: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
        }

        [data-theme="dark"] {
            --bg-primary: #020617;
            --bg-secondary: #0f172a;
            --bg-card: rgba(15, 23, 42, 0.6);
            --bg-input: rgba(15, 23, 42, 0.6);
            --text-primary: #f8fafc;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --border-color: rgba(255,255,255,0.06);
            --border-hover: rgba(255,255,255,0.12);
            --accent: #14b8a6;
            --accent-light: #2dd4bf;
            --accent-glow: rgba(20,184,166,0.15);
            --shadow: 0 4px 20px rgba(0,0,0,0.3);
            --shadow-lg: 0 10px 40px rgba(0,0,0,0.4);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { 
            font-family: 'Inter', sans-serif; 
            background: var(--bg-primary); 
            color: var(--text-secondary);
            transition: background 0.3s, color 0.3s;
        }

        .aurora-bg {
            position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
        }
        [data-theme="dark"] .aurora-bg::before {
            content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
            background: radial-gradient(ellipse 80% 50% at 20% 40%, rgba(20,184,166,0.08), transparent),
                        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(59,130,246,0.06), transparent);
            animation: aurora 20s ease-in-out infinite;
        }
        @keyframes aurora {
            0%, 100% { transform: rotate(0deg) scale(1); }
            33% { transform: rotate(120deg) scale(1.1); }
            66% { transform: rotate(240deg) scale(0.9); }
        }

        .grid-pattern {
            position: fixed; inset: 0; z-index: 1; pointer-events: none;
            background-image: linear-gradient(rgba(128,128,128,0.03) 1px, transparent 1px),
                              linear-gradient(90deg, rgba(128,128,128,0.03) 1px, transparent 1px);
            background-size: 60px 60px;
        }

        .glass {
            background: var(--bg-card);
            backdrop-filter: blur(20px) saturate(180%);
            border: 1px solid var(--border-color);
            transition: background 0.3s, border-color 0.3s;
        }
        [data-theme="dark"] .glass {
            background: rgba(15, 23, 42, 0.6);
            backdrop-filter: blur(20px) saturate(180%);
            border: 1px solid rgba(255, 255, 255, 0.06);
        }

        .glass-strong {
            background: var(--bg-card);
            backdrop-filter: blur(30px) saturate(200%);
            border-bottom: 1px solid var(--border-color);
            transition: background 0.3s, border-color 0.3s;
        }
        [data-theme="dark"] .glass-strong {
            background: rgba(15, 23, 42, 0.85);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        ::-webkit-scrollbar { width: 5px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 10px; opacity: 0.3; }

        input[type="range"] {
            -webkit-appearance: none; appearance: none; width: 100%; height: 4px;
            background: linear-gradient(90deg, var(--accent), rgba(59,130,246,0.5));
            border-radius: 2px; outline: none;
        }
        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none; appearance: none; width: 18px; height: 18px;
            border-radius: 50%; background: var(--accent); border: 3px solid var(--bg-primary);
            cursor: pointer; box-shadow: 0 0 15px var(--accent-glow);
            transition: all 0.2s;
        }
        input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.3); }

        input[type="color"] {
            -webkit-appearance: none; border: none; width: 32px; height: 32px;
            border-radius: 8px; cursor: pointer; padding: 0; overflow: hidden;
        }
        input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
        input[type="color"]::-webkit-color-swatch { border: none; border-radius: 8px; }

        .custom-checkbox {
            appearance: none; width: 20px; height: 20px;
            border: 2px solid var(--accent); border-radius: 6px;
            background: var(--bg-input); cursor: pointer; position: relative; transition: all 0.2s;
        }
        .custom-checkbox:checked { background: var(--accent); }
        .custom-checkbox:checked::after {
            content: ''; position: absolute; left: 5px; top: 2px;
            width: 6px; height: 10px; border: solid white; border-width: 0 2px 2px 0;
            transform: rotate(45deg);
        }

        .field-input {
            background: var(--bg-input); border: 1px solid var(--border-color);
            border-radius: 12px; padding: 10px 14px; color: var(--text-primary);
            font-size: 14px; width: 100%; transition: all 0.2s; outline: none;
        }
        .field-input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px var(--accent-glow);
        }
        .field-input::placeholder { color: var(--text-muted); }

        .upload-zone {
            position: relative; overflow: hidden;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            background: var(--bg-secondary);
            display: flex; flex-direction: column; align-items: center; justify-content: center;
        }
        .upload-zone::before {
            content: ''; position: absolute; inset: 0; border-radius: inherit; padding: 2px;
            background: var(--accent);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor; mask-composite: exclude;
            opacity: 0.2; transition: opacity 0.4s;
        }
        .upload-zone:hover::before { opacity: 0.6; }
        .upload-zone:hover { 
            transform: translateY(-2px); 
            box-shadow: var(--shadow-lg);
        }

        .btn-magic {
            position: relative; overflow: hidden;
            background: linear-gradient(135deg, #0d9488, #14b8a6);
            transition: all 0.3s; color: white;
        }
        .btn-magic::before {
            content: ''; position: absolute; top: 0; left: -100%;
            width: 100%; height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }
        .btn-magic:hover::before { left: 100%; }
        .btn-magic:hover { transform: translateY(-2px); box-shadow: 0 10px 40px var(--accent-glow); }
        .btn-magic:active { transform: translateY(0); }

        .page-preview {
            background: var(--bg-secondary);
            position: relative;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), inset 0 1px 0 rgba(255,255,255,0.8);
        }
        .page-preview .content-line {
            background: var(--border-color);
            border-radius: 3px; height: 5px;
        }

        .tab-btn {
            position: relative; padding: 8px 16px; border-radius: 10px;
            font-size: 13px; font-weight: 500;
            color: var(--text-muted); transition: all 0.3s;
            cursor: pointer; border: none; background: transparent;
        }
        .tab-btn.active { 
            color: var(--accent); 
            background: var(--accent-glow);
        }
        .tab-btn.active::after {
            content: ''; position: absolute; bottom: -1px; left: 20%; right: 20%;
            height: 2px; background: var(--accent); border-radius: 2px;
        }
        .tab-btn:hover:not(.active) { 
            color: var(--text-primary); 
            background: var(--border-color);
        }

        .nav-link { position: relative; }
        .nav-link::after {
            content: ''; position: absolute; bottom: -4px; left: 0;
            width: 0; height: 2px;
            background: linear-gradient(90deg, var(--accent), #3b82f6);
            border-radius: 2px; transition: width 0.3s;
        }
        .nav-link:hover::after { width: 100%; }

        .file-item { animation: slideIn 0.3s ease-out; }
        @keyframes slideIn {
            from { opacity: 0; transform: translateX(-10px); }
            to { opacity: 1; transform: translateX(0); }
        }

        .progress-ring { transform: rotate(-90deg); }
        .progress-ring-circle { transition: stroke-dashoffset 0.5s ease; }

        @keyframes pulse-glow {
            0%, 100% { box-shadow: 0 0 20px var(--accent-glow); }
            50% { box-shadow: 0 0 40px var(--accent-glow); }
        }
        .animate-pulse-glow { animation: pulse-glow 3s ease-in-out infinite; }

        .theme-toggle {
            width: 44px; height: 44px; border-radius: 12px;
            display: flex; align-items: center; justify-content: center;
            cursor: pointer; transition: all 0.3s;
            background: var(--bg-input); border: 1px solid var(--border-color);
            color: var(--text-secondary);
        }
        .theme-toggle:hover {
            background: var(--accent-glow); border-color: var(--accent);
            color: var(--accent);
        }

        [data-theme="dark"] .theme-toggle .sun-icon { display: block; }
        [data-theme="dark"] .theme-toggle .moon-icon { display: none; }
        .theme-toggle .sun-icon { display: none; }
        .theme-toggle .moon-icon { display: block; }

        .preview-number {
            position: absolute;
            white-space: nowrap;
        }

        /* Watermark tool styles */
        .wm-pos-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 4px;
            max-width: 120px;
        }
        .wm-pos-cell {
            width: 36px;
            height: 28px;
            border: 2px solid var(--border-color);
            border-radius: 6px;
            cursor: pointer;
            position: relative;
            transition: all 0.15s ease;
            background: var(--bg-secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 9px;
            font-weight: 600;
            color: var(--text-secondary);
            user-select: none;
        }
        .wm-pos-cell:hover {
            border-color: var(--accent);
            background: rgba(var(--accent-rgb, 16, 185, 129), 0.05);
            color: var(--text-primary);
        }
        .wm-pos-cell.active {
            border-color: var(--accent);
            background: rgba(var(--accent-rgb, 16, 185, 129), 0.15);
            color: var(--accent);
        }

        .preset-chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 14px;
            border: 2px solid var(--border-color);
            border-radius: 9999px;
            font-size: 12px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.15s ease;
            background: var(--bg-secondary);
            color: var(--text-primary);
            letter-spacing: 0.05em;
        }
        .preset-chip:hover {
            border-color: var(--accent);
            background: rgba(var(--accent-rgb, 16, 185, 129), 0.05);
        }
        .preset-chip.active {
            border-color: var(--accent);
            background: var(--accent);
            color: var(--bg-primary);
        }

        .range-slider {
            -webkit-appearance: none;
            appearance: none;
            width: 100%;
            height: 6px;
            border-radius: 3px;
            background: var(--border-color);
            outline: none;
            transition: background 0.2s;
        }
        .range-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--accent);
            cursor: pointer;
            border: 2px solid var(--bg-primary);
            box-shadow: 0 2px 6px rgba(0,0,0,0.2);
        }
        .range-slider::-moz-range-thumb {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--accent);
            cursor: pointer;
            border: 2px solid var(--bg-primary);
            box-shadow: 0 2px 6px rgba(0,0,0,0.2);
        }

        .wm-img-drop {
            border: 2px dashed var(--border-color);
            border-radius: 8px;
            padding: 16px;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s ease;
            background: var(--bg-secondary);
        }
        .wm-img-drop:hover {
            border-color: var(--accent);
            background: rgba(var(--accent-rgb, 16, 185, 129), 0.03);
        }

        .preview-watermark {
            position: absolute;
            white-space: nowrap;
            font-size: 9px;
            color: var(--text-secondary);
            opacity: 0.4;
            pointer-events: none;
            z-index: 1;
        }