:root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #7209b7;
            --success: #4cc9f0;
            --danger: #f72585;
            --warning: #f8961e;
            --light: #f8f9fa;
            --dark: #212529;
            --card-bg: rgba(255, 255, 255, 0.95);
            --border: rgba(0, 0, 0, 0.1);
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

        body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: var(--dark);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: var(--card-bg);
            border-radius: 24px;
            box-shadow: var(--shadow);
            overflow: hidden;
            backdrop-filter: blur(10px);
        }

        /* Header */
        .header {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            padding: 2.5rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .header::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
            background-size: 50px 50px;
            animation: float 20s linear infinite;
        }

        @keyframes float {
            0% { transform: translate(0, 0) rotate(0deg); }
            100% { transform: translate(-50px, -50px) rotate(360deg); }
        }

        .header h1 {
            font-size: 2.8rem;
            font-weight: 800;
            margin-bottom: 0.5rem;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
        }

        .header h1 i {
            font-size: 3rem;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.1); }
        }

        .subtitle {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }

        /* Features Grid */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            padding: 30px;
            background: rgba(67, 97, 238, 0.05);
        }

        .feature-card {
            background: white;
            padding: 25px;
            border-radius: 16px;
            text-align: center;
            transition: all 0.3s ease;
            border: 2px solid transparent;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
        }

        .feature-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
            box-shadow: 0 8px 25px rgba(67, 97, 238, 0.15);
        }

        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 15px;
            color: var(--primary);
        }

        /* Main Content */
        .main-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            padding: 30px;
        }

        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }

        /* Upload Section */
        .upload-section {
            background: white;
            padding: 30px;
            border-radius: 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }

        .upload-area {
            border: 3px dashed var(--primary);
            border-radius: 16px;
            padding: 60px 30px;
            text-align: center;
            margin-bottom: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
            background: rgba(67, 97, 238, 0.03);
        }

        .upload-area:hover {
            background: rgba(67, 97, 238, 0.08);
            border-color: var(--secondary);
        }

        .upload-area.dragover {
            background: rgba(67, 97, 238, 0.12);
            border-color: var(--success);
            transform: scale(1.02);
        }

        .upload-icon {
            font-size: 4rem;
            color: var(--primary);
            margin-bottom: 20px;
            opacity: 0.8;
        }

        .file-input {
            display: none;
        }

        /* File Info */
        .file-info {
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            padding: 20px;
            border-radius: 12px;
            margin-top: 20px;
            display: none;
        }

        .file-info.active {
            display: block;
            animation: slideIn 0.5s ease;
        }

        @keyframes slideIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Edit Tools */
        .edit-tools {
            background: white;
            padding: 30px;
            border-radius: 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }

        .tool-section {
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 2px solid var(--border);
        }

        .tool-section:last-child {
            border-bottom: none;
            margin-bottom: 0;
        }

        .tool-section h3 {
            color: var(--primary);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
        }

        .tool-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 15px;
        }

        .tool-btn {
            background: white;
            border: 2px solid var(--border);
            padding: 15px;
            border-radius: 12px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
        }

        .tool-btn:hover:not(.disabled) {
            border-color: var(--primary);
            background: rgba(67, 97, 238, 0.05);
            transform: translateY(-3px);
        }

        .tool-btn.active {
            border-color: var(--primary);
            background: rgba(67, 97, 238, 0.1);
            color: var(--primary);
        }

        .tool-btn.disabled {
            opacity: 0.5;
            cursor: not-allowed;
            pointer-events: none;
        }

        .tool-icon {
            font-size: 1.8rem;
        }

        .color-picker {
            display: flex;
            gap: 10px;
            align-items: center;
            margin-top: 15px;
            flex-wrap: wrap;
        }

        .color-option {
            width: 35px;
            height: 35px;
            border-radius: 50%;
            cursor: pointer;
            border: 3px solid transparent;
            transition: all 0.3s ease;
        }

        .color-option:hover {
            transform: scale(1.1);
        }

        .color-option.active {
            border-color: var(--dark);
            transform: scale(1.2);
        }

        /* Text Input */
        .text-input {
            width: 100%;
            padding: 15px;
            border: 2px solid var(--border);
            border-radius: 12px;
            font-size: 1rem;
            margin-bottom: 15px;
            transition: all 0.3s ease;
        }

        .text-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
        }

        /* Preview Area */
        .preview-section {
            grid-column: 1 / -1;
            background: white;
            padding: 30px;
            border-radius: 20px;
            margin: 0 30px 30px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }

        .preview-container {
            min-height: 400px;
            background: linear-gradient(45deg, #f8f9fa 25%, transparent 25%),
                        linear-gradient(-45deg, #f8f9fa 25%, transparent 25%),
                        linear-gradient(45deg, transparent 75%, #f8f9fa 75%),
                        linear-gradient(-45deg, transparent 75%, #f8f9fa 75%);
            background-size: 20px 20px;
            background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
            padding: 40px;
        }

        .preview-content {
            text-align: center;
            max-width: 600px;
        }

        .preview-placeholder {
            font-size: 5rem;
            color: var(--primary);
            opacity: 0.3;
            margin-bottom: 20px;
        }

        .preview-text {
            position: absolute;
            font-size: 24px;
            pointer-events: none;
            word-wrap: break-word;
            text-align: center;
            z-index: 10;
        }

        .preview-highlight {
            position: absolute;
            border-radius: 4px;
            pointer-events: none;
            z-index: 5;
        }

        .preview-underline {
            position: absolute;
            height: 2px;
            background: currentColor;
            pointer-events: none;
            z-index: 5;
        }

        .preview-watermark {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: repeating-linear-gradient(45deg, transparent, transparent 20px, rgba(0,0,0,0.03) 20px, rgba(0,0,0,0.03) 40px);
            pointer-events: none;
            z-index: 1;
        }

        /* Action Buttons */
        .action-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            padding: 30px;
            background: rgba(67, 97, 238, 0.05);
            border-top: 1px solid var(--border);
        }

        .btn {
            padding: 16px 40px;
            border: none;
            border-radius: 12px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 10px;
            min-width: 200px;
            justify-content: center;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
        }

        .btn-primary:hover:not(:disabled) {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(67, 97, 238, 0.4);
        }

        .btn-secondary {
            background: white;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn-secondary:hover:not(:disabled) {
            background: var(--primary);
            color: white;
        }

        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none !important;
        }

        /* Progress */
        .progress-container {
            height: 6px;
            background: var(--border);
            border-radius: 3px;
            margin: 20px 30px;
            overflow: hidden;
            display: none;
        }

        .progress-bar {
            height: 100%;
            background: linear-gradient(90deg, var(--primary), var(--success));
            width: 0%;
            transition: width 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .progress-bar::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(90deg, 
                transparent, 
                rgba(255, 255, 255, 0.4), 
                transparent);
            animation: shimmer 2s infinite;
        }

        @keyframes shimmer {
            0% { transform: translateX(-100%); }
            100% { transform: translateX(100%); }
        }

        /* Results */
        .results-section {
            padding: 30px;
            display: none;
            animation: fadeIn 0.5s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .results-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .result-card {
            background: white;
            padding: 25px;
            border-radius: 16px;
            text-align: center;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
            border-left: 5px solid var(--primary);
        }

        .download-area {
            text-align: center;
            padding: 40px;
            background: linear-gradient(135deg, rgba(67, 97, 238, 0.05), rgba(114, 9, 183, 0.05));
            border-radius: 20px;
            margin-top: 30px;
        }

        /* Security Badge */
        .security-badge {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: white;
            padding: 12px 20px;
            border-radius: 50px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            display: flex;
            align-items: center;
            gap: 10px;
            z-index: 1000;
            font-weight: 500;
            color: var(--primary);
            border: 2px solid rgba(67, 97, 238, 0.2);
        }

        /* Toast Notifications */
        .toast {
            position: fixed;
            bottom: 20px;
            left: 20px;
            background: white;
            padding: 15px 25px;
            border-radius: 50px;
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            gap: 10px;
            z-index: 1000;
            border-left: 5px solid var(--success);
            animation: slideInLeft 0.3s ease;
        }

        @keyframes slideInLeft {
            from { transform: translateX(-100%); opacity: 0; }
            to { transform: translateX(0); opacity: 1; }
        }

        /* Responsive */
        @media (max-width: 768px) {
            .header h1 {
                font-size: 2rem;
            }
            
            .btn {
                min-width: 150px;
                padding: 14px 25px;
            }
            
            .action-buttons {
                flex-direction: column;
                align-items: center;
            }
        }