* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            background: #f0f4f8;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.5;
            color: #1e293b;
            padding: 20px;
        }
        
        .contract-wrapper {
            max-width: 1400px;
            margin: 0 auto;
            width: 100%;
        }
        
        .key-field {
            background: #fff8e7;
            border: 2px solid #ffc107;
            border-radius: 8px;
        }
        
        .key-field input {
            font-family: monospace;
            font-size: 16px;
            letter-spacing: 2px;
        }
        
        .digital-code-field {
            margin-top: 15px;
        }
        
        .digital-code-field input {
            font-family: monospace;
            font-size: 16px;
            letter-spacing: 1px;
            background: #fff8e7;
            border: 2px solid #ffc107;
        }
        
        .digital-code-field.error input {
            border-color: #dc3545 !important;
            background-color: #fff0f0 !important;
        }
        
        .key-warning {
            background: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 12px;
            margin: 15px 0;
            border-radius: 8px;
            font-size: 14px;
        }
        
        .key-info {
            background: #d1ecf1;
            border-left: 4px solid #0c5460;
            padding: 12px;
            margin: 15px 0;
            border-radius: 8px;
            font-size: 14px;
            color: #0c5460;
        }
        
        .current-key-info {
            background: #e8f0fe;
            border-left: 4px solid #1e466e;
            padding: 12px;
            margin: 15px 0;
            border-radius: 8px;
            font-size: 14px;
        }
        
        .required-star {
            color: #dc3545;
        }
        
        .optional-badge {
            background: #e2e8f0;
            padding: 2px 8px;
            border-radius: 12px;
            font-size: 11px;
            font-weight: normal;
            margin-left: 8px;
        }
        
        .hidden-field {
            display: none;
        }
        
        .alert-success {
            background: #d4edda;
            border: 1px solid #c3e6cb;
            color: #155724;
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 20px;
        }
        
        .alert-error {
            background: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 20px;
        }
        
        .validation-summary {
            display: none;
            background: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 20px;
        }
        
        .validation-summary.show {
            display: block;
        }
        
        .error-textarea {
            border-color: #dc3545 !important;
            background-color: #fff0f0 !important;
        }
        
        .error-field {
            background-color: #fff0f0 !important;
        }
        
        .file-input-error {
            border-color: #dc3545 !important;
        }
        
        .error-message {
            display: none;
            color: #dc3545;
            font-size: 12px;
            margin-top: 5px;
        }
        
        .error-message.show {
            display: block;
        }
        
        .btn-save:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }
        
        .action-buttons {
            margin-bottom: 20px;
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        
        .button-1981 {
            background: #1e466e;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            text-decoration: none;
            display: inline-block;
            font-size: 14px;
            transition: background 0.3s, transform 0.1s;
        }
        
        .button-1981:hover {
            background: #0f2d4a;
        }
        
        .form-card {
            background: white;
            border-radius: 20px;
            padding: 25px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }
        
        .form-title {
            font-size: 24px;
            font-weight: bold;
            color: #1e466e;
            text-align: center;
            margin-bottom: 20px;
        }
        
        .current-date-info {
            background: #f8f9fa;
            padding: 10px;
            border-radius: 8px;
            margin-bottom: 15px;
            text-align: center;
        }
        
        .required-fields-info {
            background: #fff3cd;
            padding: 10px;
            border-radius: 8px;
            margin-bottom: 15px;
            font-size: 13px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: #1e466e;
        }
        
        .form-group input[type="text"],
        .form-group input[type="password"],
        .form-group input[type="date"] {
            width: 100%;
            padding: 12px;
            border: 1px solid #cbd5e1;
            border-radius: 8px;
            font-size: 14px;
            transition: border-color 0.2s;
        }
        
        .form-group input:focus {
            outline: none;
            border-color: #1e466e;
            box-shadow: 0 0 0 3px rgba(30, 70, 110, 0.1);
        }
        
        .file-upload-section {
            margin: 20px 0;
        }
        
        .file-upload-box {
            background: #f8f9fa;
            padding: 15px;
            border-radius: 12px;
            border: 2px dashed #cbd5e1;
            transition: border-color 0.2s;
        }
        
        .file-upload-box:hover {
            border-color: #1e466e;
        }
        
        .file-upload-box input[type="file"] {
            width: 100%;
            padding: 10px;
            cursor: pointer;
        }
        
        .file-info {
            font-size: 12px;
            color: #6c757d;
            margin-top: 5px;
        }
        
        .table-container {
            overflow-x: auto;
            margin: 20px 0;
            -webkit-overflow-scrolling: touch;
        }
        
        .data-table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            min-width: 500px;
        }
        
        .data-table th {
            background: #1e466e;
            color: white;
            padding: 12px;
            text-align: left;
            font-weight: 600;
        }
        
        .data-table td {
            padding: 12px;
            border: 1px solid #cbd5e1;
            vertical-align: top;
        }
        
        .data-table textarea,
        .data-table input[type="date"],
        .data-table input[type="text"] {
            width: 100%;
            padding: 8px;
            border: 1px solid #cbd5e1;
            border-radius: 6px;
            font-family: inherit;
            font-size: 14px;
            transition: border-color 0.2s;
        }
        
        .data-table textarea:focus,
        .data-table input:focus {
            outline: none;
            border-color: #1e466e;
        }
        
        .btn-create,
        .btn-save {
            padding: 12px 30px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 500;
        }
        
        .btn-create {
            background: #2c7da0;
            color: white;
        }
        
        .btn-save {
            background: #28a745;
            color: white;
        }
        
        .btn-create:hover {
            background: #1f5e7a;
            transform: translateY(-1px);
        }
        
        .btn-save:hover:not(:disabled) {
            background: #218838;
            transform: translateY(-1px);
        }
        
        .btn-create:active,
        .btn-save:active {
            transform: translateY(0);
        }
        
        .db-info {
            background: #e8f0fe;
            padding: 15px;
            border-radius: 12px;
            margin-top: 20px;
            font-size: 13px;
        }
        
        footer {
            text-align: center;
            margin-top: 20px;
            padding: 15px;
            color: #6c757d;
            font-size: 12px;
        }
        
        #previewContent {
            overflow-x: auto;
        }
        
        #previewContent table {
            min-width: 300px;
        }

        @media (max-width: 480px) {
            body {
                padding: 10px;
            }
            
            .form-card {
                padding: 16px;
                border-radius: 16px;
            }
            
            .form-title {
                font-size: 18px;
                margin-bottom: 16px;
            }
            
            .action-buttons {
                gap: 8px;
                margin-bottom: 15px;
            }
            
            .button-1981 {
                padding: 8px 16px;
                font-size: 0.85rem;
            }
            
            .file-upload-box {
                padding: 12px;
            }
            
            .file-upload-box label {
                font-size: 13px;
            }
            
            .data-table {
                font-size: 11px;
                min-width: 480px;
            }
            
            .data-table th,
            .data-table td {
                padding: 8px 6px;
            }
            
            .data-table textarea {
                min-height: 60px;
                font-size: 11px;
            }
            
            .btn-create,
            .btn-save {
                padding: 10px 20px;
                font-size: 14px;
                width: 100%;
            }
            
            .required-fields-info,
            .current-date-info,
            .db-info {
                font-size: 11px;
                padding: 8px 12px;
            }
            
            .db-info ul {
                margin-left: 16px;
            }
            
            footer {
                font-size: 10px;
                margin: 20px 0 10px;
            }
            
            .key-warning,
            .key-info {
                font-size: 12px;
                padding: 10px;
            }
        }
        
        @media (min-width: 481px) and (max-width: 767px) {
            body {
                padding: 15px;
            }
            
            .form-card {
                padding: 20px;
            }
            
            .form-title {
                font-size: 20px;
            }
            
            .data-table {
                font-size: 12px;
                min-width: 520px;
            }
            
            .btn-create,
            .btn-save {
                padding: 10px 24px;
                flex: 1;
            }
            
            .action-buttons {
                justify-content: center;
            }
            
            div[style*="display: flex; gap: 15px"] {
                flex-direction: row;
            }
        }
        
        @media (min-width: 768px) and (max-width: 1023px) {
            .form-card {
                padding: 28px;
            }
            
            .form-title {
                font-size: 22px;
            }
            
            .data-table {
                font-size: 12px;
            }
            
            .data-table th,
            .data-table td {
                padding: 10px 8px;
            }
            
            .action-buttons {
                justify-content: flex-start;
            }
        }
        
        @media (min-width: 1024px) and (max-width: 1279px) {
            .contract-wrapper {
                max-width: 1200px;
            }
            
            .form-card {
                padding: 32px;
            }
            
            .data-table {
                font-size: 13px;
            }
        }
        
        @media (min-width: 1280px) {
            .contract-wrapper {
                max-width: 1400px;
            }
            
            .form-card {
                padding: 36px;
            }
            
            .form-title {
                font-size: 26px;
            }
            
            .data-table {
                font-size: 14px;
            }
            
            .data-table th,
            .data-table td {
                padding: 14px 12px;
            }
            
            .data-table textarea {
                min-height: 100px;
                font-size: 13px;
            }
        }
        
        @media (max-width: 767px) and (orientation: landscape) {
            body {
                padding: 10px;
            }
            
            .form-card {
                padding: 16px;
            }
            
            .data-table textarea {
                min-height: 50px;
            }
            
            .action-buttons {
                margin-bottom: 10px;
            }
        }
        
        @media (max-width: 480px) {
            .db-info ul {
                padding-left: 20px;
            }
            
            .db-info li {
                margin-bottom: 5px;
            }
            
            .validation-summary {
                padding: 10px 15px;
            }
            
            .validation-summary ul {
                margin-left: 20px;
                margin-top: 8px;
            }
            
            .alert-success,
            .alert-error {
                padding: 10px 15px;
                font-size: 13px;
            }
        }
        
        @media (max-width: 767px) {
            button,
            .button-1981,
            input[type="file"],
            .btn-create,
            .btn-save {
                cursor: pointer;
                -webkit-tap-highlight-color: transparent;
                min-height: 44px;
            }
            
            button:active,
            .button-1981:active,
            .btn-create:active,
            .btn-save:active {
                transform: scale(0.98);
            }
            
            textarea,
            input[type="text"],
            input[type="password"],
            input[type="date"] {
                font-size: 16px !important;
            }
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        @media (max-width: 380px) {
            .data-table {
                font-size: 10px;
                min-width: 420px;
            }
            
            .data-table th,
            .data-table td {
                padding: 6px 4px;
            }
        }
        
        @media (prefers-color-scheme: dark) {
            @media (max-width: 768px) {
                body {
                    background: #0f172a;
                }
                
                .form-card {
                    background: #1e293b;
                    color: #e2e8f0;
                }
                
                .form-title {
                    color: #60a5fa;
                }
                
                .data-table {
                    background: #1e293b;
                }
                
                .data-table td {
                    border-color: #334155;
                }
                
                .db-info {
                    background: #0f172a;
                    color: #94a3b8;
                }
            }
        }