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

        :root {
            --primary-color: #2563eb;
            --success-color: #059669;
            --warning-color: #f59e0b;
            --danger-color: #ef4444;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --transition-fast: 150ms ease;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--bg-light);
            height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .header {
            background: linear-gradient(135deg, var(--primary-color) 0%, #3b82f6 100%);
            color: white;
            padding: 1.25rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
        }

        .header h1 {
            font-size: 1.375rem;
            font-weight: 600;
            letter-spacing: -0.025em;
            margin: 0;
        }

        .header-left {
            display: flex;
            align-items: center;
            gap: 2.5rem;
        }

        .navigation {
            display: flex;
            gap: 0.625rem;
            align-items: center;
        }

        .nav-btn, .action-btn {
            background: rgba(255,255,255,0.2);
            border: none;
            color: white;
            padding: 0.625rem 1.25rem;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.875rem;
            font-weight: 500;
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            position: relative;
            white-space: nowrap;
            letter-spacing: 0.025em;
        }

        .btn-icon {
            font-size: 1.125rem;
            line-height: 1;
            display: inline-flex;
            align-items: center;
        }

        .btn-text {
            font-weight: 500;
            line-height: 1;
        }

        /* Tooltip for keyboard shortcuts */
        .nav-btn::after, .action-btn::after {
            content: attr(title);
            position: absolute;
            bottom: -32px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(31, 41, 55, 0.95);
            color: white;
            padding: 0.375rem 0.625rem;
            border-radius: 4px;
            font-size: 0.75rem;
            font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.2s ease;
            z-index: 1000;
        }

        .nav-btn:hover::after, .action-btn:hover::after {
            opacity: 1;
        }

        .nav-btn:hover, .action-btn:hover {
            background: rgba(255,255,255,0.3);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.15);
        }

        .nav-btn:active, .action-btn:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .nav-btn:disabled, .action-btn:disabled {
            background: rgba(255,255,255,0.1);
            cursor: not-allowed;
            transform: none;
            opacity: 0.5;
        }

        .nav-btn:disabled::after, .action-btn:disabled::after {
            display: none;
        }

        .undo-redo-group {
            display: flex;
            gap: 0.375rem;
            margin: 0 0.75rem;
            padding: 0 0.75rem;
            border-left: 1px solid rgba(255,255,255,0.2);
            border-right: 1px solid rgba(255,255,255,0.2);
        }

        .undo-redo-group .nav-btn {
            padding: 0.625rem 1rem;
            background: rgba(255,255,255,0.15);
        }

        .project-counter {
            font-size: 0.875rem;
            font-weight: 600;
            background: rgba(255,255,255,0.15);
            padding: 0.625rem 1.25rem;
            border-radius: 6px;
            margin-left: 0.75rem;
            letter-spacing: 0.025em;
            min-width: 80px;
            text-align: center;
        }

        .actions-group {
            display: flex;
            gap: 0.625rem;
        }

        .actions-group .action-btn {
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(10px);
        }

        .actions-group .action-btn:hover {
            background: rgba(255,255,255,0.25);
        }

        .status-bar {
            background: #f0f9ff;
            border-top: 2px solid #3b82f6;
            padding: 0.5rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            min-height: 2.5rem;
        }

        .status-message {
            color: var(--text-secondary);
        }

        .save-indicator {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--success-color);
            opacity: 0;
            transition: opacity var(--transition-fast);
        }

        .save-indicator.active {
            opacity: 1;
        }

        .main-content {
            flex: 1;
            padding: 1.5rem;
            overflow-y: auto;
        }

        .review-container {
            max-width: 1400px;
            margin: 0 auto;
            background: var(--bg-white);
            border-radius: 8px;
            box-shadow: var(--shadow-md);
        }

        .project-header {
            background: var(--bg-light);
            padding: 1.5rem;
            border-bottom: 1px solid var(--border-color);
            position: relative;
        }

        .project-header-content {
            display: flex;
            justify-content: space-between;
            align-items: start;
        }

        .project-info {
            flex: 1;
        }

        .completion-badge {
            background: var(--warning-color);
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
        }

        .completion-badge.complete {
            background: var(--success-color);
        }

        .review-content {
            padding: 1.5rem;
        }

        .field-review-pair {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin-bottom: 2rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid #f1f5f9;
            animation: fadeIn 0.3s ease;
        }

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

        .field-review-pair:last-child {
            border-bottom: none;
            margin-bottom: 0;
        }

        .original-field {
            background: var(--bg-light);
            border-radius: 6px;
            padding: 1rem;
            border: 1px solid var(--border-color);
        }

        .review-field {
            display: flex;
            flex-direction: column;
        }

        .field-title {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-size: 0.85rem;
        }

        .original-content {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            font-size: 0.9rem;
            line-height: 1.6;
            color: var(--text-secondary);
        }

        .field-label {
            display: block;
            font-weight: 600;
            color: #374151;
            margin-bottom: 0.5rem;
            font-size: 0.9rem;
        }

        .field-input {
            width: 100%;
            min-height: 100px;
            padding: 0.75rem;
            border: 1px solid #d1d5db;
            border-radius: 6px;
            font-size: 0.9rem;
            resize: vertical;
            font-family: inherit;
            line-height: 1.4;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .field-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }

        .field-input.modified {
            border-color: var(--warning-color);
            background: #fffbeb;
        }

        .save-button {
            background: var(--success-color);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
            margin-top: 1rem;
            transition: all var(--transition-fast);
        }

        .save-button:hover {
            background: #047857;
            transform: translateY(-1px);
        }

        .project-title {
            color: var(--text-primary);
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .project-meta {
            color: var(--text-secondary);
            font-size: 0.85rem;
            margin-bottom: 0.5rem;
        }

        .project-meta-badges {
            display: flex;
            gap: 0.5rem;
            margin-top: 0.5rem;
        }

        .meta-badge {
            background: var(--bg-light);
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-size: 0.75rem;
            border: 1px solid var(--border-color);
        }

        /* Progress bar */
        .progress-container {
            background: linear-gradient(to bottom, #ffffff, #fafbfc);
            padding: 1rem 2rem;
            border-bottom: 1px solid var(--border-color);
        }

        .progress-bar {
            width: 100%;
            height: 6px;
            background: #e5e7eb;
            border-radius: 3px;
            overflow: hidden;
            box-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #3b82f6, #2563eb);
            transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            border-radius: 3px;
            box-shadow: 0 1px 2px rgba(59, 130, 246, 0.5);
            position: relative;
        }

        .progress-fill::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(90deg,
                transparent,
                rgba(255,255,255,0.3) 50%,
                transparent);
            animation: shimmer 2s infinite;
        }

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

        .progress-text {
            display: flex;
            justify-content: space-between;
            margin-top: 0.625rem;
            font-size: 0.8125rem;
            font-weight: 500;
            color: var(--text-secondary);
        }

        .progress-text span {
            letter-spacing: 0.025em;
        }

        /* Modal */
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            animation: fadeIn 0.2s ease;
        }

        .modal.active {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .modal-content {
            background: var(--bg-white);
            padding: 2rem;
            border-radius: 8px;
            max-width: 500px;
            width: 90%;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
            animation: slideUp 0.3s ease;
        }

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

        .modal-header {
            margin-bottom: 1rem;
        }

        .modal-title {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .modal-body {
            margin-bottom: 1.5rem;
            color: var(--text-secondary);
        }

        .modal-footer {
            display: flex;
            gap: 0.5rem;
            justify-content: flex-end;
        }

        .modal-btn {
            padding: 0.5rem 1rem;
            border-radius: 4px;
            border: none;
            cursor: pointer;
            font-weight: 500;
            transition: all var(--transition-fast);
        }

        .modal-btn-primary {
            background: var(--primary-color);
            color: white;
        }

        .modal-btn-secondary {
            background: var(--bg-light);
            color: var(--text-primary);
        }

        /* Clean typography */
        body {
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* Toast notifications */
        .toast {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: var(--bg-white);
            padding: 1rem;
            border-radius: 6px;
            box-shadow: var(--shadow-md);
            border-left: 4px solid var(--success-color);
            max-width: 400px;
            opacity: 0;
            transform: translateX(100%);
            transition: all 0.3s ease;
            z-index: 2000;
        }

        .toast.show {
            opacity: 1;
            transform: translateX(0);
        }

        .toast.error {
            border-left-color: var(--danger-color);
        }

        .toast.warning {
            border-left-color: var(--warning-color);
        }

        /* Accessibility */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* Responsive Design */
        @media (max-width: 1024px) {
            .field-review-pair {
                grid-template-columns: 1fr;
            }

            .header {
                padding: 1rem;
            }

            .header-left {
                flex-direction: column;
                gap: 1rem;
                align-items: stretch;
            }

            .navigation {
                justify-content: center;
                flex-wrap: wrap;
            }

            .actions-group {
                justify-content: center;
                margin-top: 1rem;
            }

            .nav-btn, .action-btn {
                padding: 0.5rem 1rem;
                font-size: 0.8125rem;
            }

            .btn-icon {
                font-size: 1rem;
            }

            .header h1 {
                font-size: 1.125rem;
                text-align: center;
            }

            .undo-redo-group {
                margin: 0 0.5rem;
                padding: 0 0.5rem;
            }
        }

        @media (max-width: 640px) {
            .header {
                flex-direction: column;
                gap: 1rem;
            }

            .project-counter {
                margin: 0.5rem auto 0;
            }

            .nav-btn::after, .action-btn::after {
                bottom: -28px;
                font-size: 0.7rem;
            }

            .progress-text {
                font-size: 0.75rem;
            }
        }
    </style>