:root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --secondary: #3b82f6;
            --secondary-dark: #2563eb;
            --accent: #06b6d4;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --light: #f1f5f9;
            --lighter: #f8fafc;
            --dark: #334155;
            --border: #e2e8f0;
            --shadow: rgba(0, 0, 0, 0.1);
            --radius: 12px;
            --radius-sm: 8px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        header {
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(10px);
            border-radius: var(--radius);
            box-shadow: 0 10px 30px var(--shadow);
            margin-bottom: 30px;
            padding: 40px;
            margin-top: 90px;
            margin-bottom: -10px;
            animation: slideDown 0.5s ease-out;
        }

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

        .header-content {
          
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .logo-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
        }

        #h1contra {
        
            font-size: clamp(1.5rem, 4vw, 2.2rem);
            font-weight: 700;
            color: var(--primary);
            margin-bottom: -50px;
        }

        .subtitle {
            font-size: clamp(0.9rem, 2vw, 1.1rem);
            color: var(--dark);
            opacity: 0.8;
        }

        .header-stats {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .stat-item {
            text-align: center;
            padding: 10px 20px;
            background: var(--lighter);
            border-radius: var(--radius-sm);
        }

        .stat-number {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--secondary);
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--dark);
            opacity: 0.7;
        }

        main {
            display: grid;
            grid-template-columns: 380px 1fr;
            gap: 30px;
            animation: fadeIn 0.6s ease-out;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
            }
            to {
                opacity: 1;
            }
        }

        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
            }
        }

        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .card {
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(10px);
            border-radius: var(--radius);
            box-shadow: 0 10px 30px var(--shadow);
            padding: 25px;
            transition: var(--transition);
        }

        .card:hover {
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
        }

        .card-title {
            font-size: 1.3rem;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 2px solid var(--border);
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
        }

        .model-selector {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            gap: 12px;
            margin-bottom: 25px;
        }

        .model-card {
            background: var(--lighter);
            border: 2px solid transparent;
            border-radius: var(--radius-sm);
            padding: 15px 10px;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .model-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--secondary), var(--accent));
            transform: scaleX(0);
            transition: var(--transition);
        }

        .model-card:hover {
            border-color: var(--secondary);
            transform: translateY(-3px);
            box-shadow: 0 8px 20px var(--shadow);
        }

        .model-card:hover::before {
            transform: scaleX(1);
        }

        .model-card.active {
            border-color: var(--secondary);
            background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(6, 182, 212, 0.1));
        }

        .model-card.active::before {
            transform: scaleX(1);
        }

        .model-icon {
            font-size: 2rem;
            margin-bottom: 8px;
            display: block;
        }

        .model-name {
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 5px;
            color: var(--primary);
        }

        .model-desc {
            font-size: 0.75rem;
            color: var(--dark);
            opacity: 0.7;
            line-height: 1.3;
        }

        .search-box {
            position: relative;
            margin-bottom: 15px;
        }

        .search-box input {
            width: 100%;
            padding: 12px 40px 12px 15px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            transition: var(--transition);
        }

        .search-box input:focus {
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
            outline: none;
        }

        .search-icon {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--dark);
            opacity: 0.5;
        }

        .tabs {
            display: flex;
            margin-bottom: 20px;
            background: var(--lighter);
            padding: 5px;
            border-radius: var(--radius-sm);
            gap: 5px;
        }

        .tab {
            flex: 1;
            padding: 10px 15px;
            cursor: pointer;
            font-weight: 500;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            text-align: center;
            font-size: 0.9rem;
            color: var(--dark);
        }

        .tab:hover {
            background: white;
        }

        .tab.active {
            background: var(--secondary);
            color: white;
            box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
        }

        .tab-content {
            display: none;
            animation: fadeIn 0.3s ease-out;
        }

        .tab-content.active {
            display: block;
        }

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--primary);
            font-size: 0.95rem;
        }

        input, select, textarea {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            transition: var(--transition);
            font-family: inherit;
            background: white;
        }

        input:focus, select:focus, textarea:focus {
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
            outline: none;
        }

        textarea {
            resize: vertical;
            min-height: 80px;
        }

        .form-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
        }

        .btn {
            padding: 12px 25px;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-family: inherit;
            position: relative;
            overflow: hidden;
        }

        .btn::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.3);
            transform: translate(-50%, -50%);
            transition: width 0.6s, height 0.6s;
        }

        .btn:hover::before {
            width: 300px;
            height: 300px;
        }

        .btn span {
            position: relative;
            z-index: 1;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
            color: white;
            box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
        }

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

        .btn-secondary:hover {
            background: var(--border);
            transform: translateY(-2px);
        }

        .btn-success {
            background: linear-gradient(135deg, var(--success), #059669);
            color: white;
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
        }

        .btn-success:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
        }

        .btn-warning {
            background: linear-gradient(135deg, var(--warning), #d97706);
            color: white;
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
        }

        .btn-warning:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
        }

        .btn-full {
            width: 100%;
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none !important;
        }

        .actions {
            display: flex;
            gap: 12px;
            margin-top: 25px;
            flex-wrap: wrap;
        }

        .document-preview {
            background: white;
            min-height: 600px;
            padding: 60px 50px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 40px var(--shadow);
            line-height: 1.9;
            font-size: 0.95rem;
        }

        @media print {
            body {
                background: white;
            }

            .sidebar, header, .actions, footer {
                display: none;
            }

            .document-preview {
                box-shadow: none;
                padding: 20mm;
            }
        }

        .document-title {
            text-align: center;
            font-size: 1.8rem;
            margin-bottom: 40px;
            color: var(--primary);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            padding-bottom: 15px;
            border-bottom: 3px solid var(--primary);
        }

        .document-section {
            margin-bottom: 30px;
        }

        .document-section p {
            margin-bottom: 15px;
            text-align: justify;
        }

        .document-section-title {
            font-size: 1.1rem;
            margin-bottom: 15px;
            color: var(--primary);
            font-weight: 700;
            text-transform: uppercase;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--border);
        }

        .signature-area {
            margin-top: 60px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
        }

        .signature-block {
            text-align: center;
        }

        .signature-line {
            border-top: 2px solid var(--primary);
            margin-top: 80px;
            padding-top: 10px;
            font-weight: 600;
        }

        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 16px 24px;
            border-radius: var(--radius-sm);
            background: var(--success);
            color: white;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            transform: translateX(calc(100% + 40px));
            transition: var(--transition);
            z-index: 1000;
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 500;
            max-width: 400px;
        }

        .notification.show {
            transform: translateX(0);
        }

        .notification.error {
            background: var(--danger);
        }

        .notification.warning {
            background: var(--warning);
        }

        .field-required::after {
            content: " *";
            color: var(--danger);
            font-weight: 700;
        }

        .help-text {
            font-size: 0.85rem;
            color: var(--dark);
            opacity: 0.7;
            margin-top: 5px;
            font-style: italic;
        }

        footer {
            text-align: center;
            margin-top: 50px;
            padding: 30px 20px;
            color: white;
            font-size: 0.9rem;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: var(--radius);
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 15px;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: white;
            text-decoration: none;
            opacity: 0.8;
            transition: var(--transition);
        }

        .footer-links a:hover {
            opacity: 1;
            text-decoration: underline;
        }

        .progress-bar {
            height: 4px;
            background: var(--border);
            border-radius: 2px;
            margin-bottom: 20px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--secondary), var(--accent));
            border-radius: 2px;
            transition: width 0.3s ease;
        }

        .field-group-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--primary);
            margin: 25px 0 15px 0;
            padding-left: 12px;
            border-left: 4px solid var(--secondary);
        }

        .checkbox-group {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 15px;
        }

        .checkbox-group input[type="checkbox"] {
            width: auto;
            cursor: pointer;
        }

        .checkbox-group label {
            margin-bottom: 0;
            cursor: pointer;
        }

        .quick-actions {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
            margin-top: 15px;
        }

        .quick-action-btn {
            padding: 10px;
            background: var(--lighter);
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            font-size: 0.85rem;
            font-weight: 500;
        }

        .quick-action-btn:hover {
            border-color: var(--secondary);
            background: rgba(59, 130, 246, 0.05);
        }

        @media (max-width: 768px) {
            .container {
                padding: 15px;
            }

            header {
                padding: 50px;
            }

            .header-stats {
                width: 100%;
                justify-content: space-around;
            }

            .model-selector {
                grid-template-columns: repeat(2, 1fr);
            }

            .tabs {
                flex-direction: column;
            }

            .form-row {
                grid-template-columns: 1fr;
            }

            .document-preview {
                padding: 30px 20px;
            }

            .signature-area {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .actions {
                flex-direction: column;
            }

            .actions .btn {
                width: 100%;
            }

            .notification {
                right: 15px;
                left: 15px;
                max-width: none;
            }
        }

        @media (max-width: 480px) {
            #h1contra {
                font-size: 1.3rem;
            }

            .subtitle {
                font-size: 0.85rem;
            }

            .model-selector {
                grid-template-columns: 1fr;
            }

            .model-card {
                padding: 12px;
            }

            .document-title {
                font-size: 1.4rem;
            }

            .document-preview {
                padding: 20px 15px;
            }
        }

        .loading-spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s ease-in-out infinite;
        }

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

        .hidden {
            display: none !important;
        }

        .fade-in {
            animation: fadeIn 0.3s ease-out;
        }

        .slide-up {
            animation: slideUp 0.3s ease-out;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }