:root {
            --primary:#4d6dfd;
            --primary-dark:#4d6dfd;
            --primary-light:#4d6dfd;
            --secondary: #f72585;
            --dark: #212529;
            --light: #f8f9fa;
            --gray: #6c757d;
            --success: #4cc9f0;
            --border-radius: 12px;
            --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.6;
            color: var(--dark);
            background-color: #f5f7ff;
            min-height: 100vh;
            padding: 2rem;
        }

        .glass-card {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            border: 1px solid rgba(255, 255, 255, 0.2);
            overflow: hidden;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        header {
            text-align: center;
            margin-bottom: 2.5rem;
        }

        h1 {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(45deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 0.5rem;
        }

        .subtitle {
            color: var(--gray);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
        }

        .editor-container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        @media (min-width: 992px) {
            .editor-container {
                grid-template-columns: 2fr 1fr;
            }
        }

        .image-section {
            position: relative;
        }

        .image-wrapper {
            position: relative;
            width: 100%;
            height: 0;
            padding-bottom: 75%;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            background-color: #000;
        }

        #image-preview {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: contain;
            display: none;
        }

        .upload-area {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 3rem 2rem;
            border: 2px dashed var(--primary-light);
            border-radius: var(--border-radius);
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            background: rgba(72, 149, 239, 0.05);
            margin-bottom: 2rem;
        }

        .upload-area:hover {
            border-color: var(--primary);
            background: rgba(72, 149, 239, 0.1);
        }

        .upload-icon {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }

        .upload-text {
            font-size: 1.2rem;
            margin-bottom: 1rem;
            color: var(--dark);
        }

        .upload-subtext {
            color: var(--gray);
            font-size: 0.9rem;
        }

        #image-upload {
            display: none;
        }

        .controls-section {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .control-card {
            padding: 1.5rem;
        }

        .card-title {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--primary-dark);
            margin-bottom: 1.25rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        }

        .card-title i {
            font-size: 1.1rem;
        }

        .form-group {
            margin-bottom: 1.25rem;
        }

        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--dark);
        }

        .form-control {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid #e0e0e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
            background-color: var(--light);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }

        .range-container {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .range-value {
            min-width: 40px;
            text-align: center;
            font-weight: 600;
            color: var(--primary-dark);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            font-size: 1rem;
            font-weight: 600;
            color: white;
            background-color: var(--primary);
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            width: 100%;
            text-align: center;
        }

        .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
        }

        .btn:active {
            transform: translateY(0);
        }

        .btn:disabled {
            background-color: #cccccc;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .btn-secondary {
            background-color: var(--gray);
        }

        .btn-secondary:hover {
            background-color: #5a6268;
        }

        .btn-success {
            background-color: var(--success);
        }

        .btn-success:hover {
            background-color: #3aa8d0;
        }

        .btn-group {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-top: 1rem;
        }

        .tooltip {
            position: relative;
            display: inline-block;
            margin-left: 0.5rem;
            cursor: pointer;
        }

        .tooltip i {
            color: var(--gray);
            font-size: 0.9rem;
        }

        .tooltip-text {
            visibility: hidden;
            width: 200px;
            background-color: var(--dark);
            color: #fff;
            text-align: center;
            border-radius: 6px;
            padding: 0.5rem;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.85rem;
            font-weight: normal;
        }

        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }

        .loading {
            display: none;
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 100;
            border-radius: var(--border-radius);
            justify-content: center;
            align-items: center;
            flex-direction: column;
            color: white;
        }

        .loading.active {
            display: flex;
        }

        .spinner {
            width: 50px;
            height: 50px;
            border: 5px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
            margin-bottom: 1rem;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .watermark-preview {
            margin-top: 1rem;
            padding: 1rem;
            background: var(--light);
            border-radius: 8px;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 60px;
            font-weight: bold;
            color: var(--primary-dark);
            border: 1px dashed var(--primary-light);
        }

        @media (max-width: 768px) {
            body {
                padding: 1rem;
            }

            h1 {
                font-size: 2rem;
            }

            .btn-group {
                grid-template-columns: 1fr;
            }
        }