/* ================================================================
           CSS RESET & BASE STYLES
           ================================================================ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        :root {
            /* Color Palette */
            --color-primary: #6366f1;
            --color-primary-dark: #4f46e5;
            --color-primary-light: #818cf8;
            --color-success: #10b981;
            --color-success-light: #d1fae5;
            --color-error: #ef4444;
            --color-error-light: #fee2e2;
            --color-warning: #f59e0b;
            --color-warning-light: #fef3c7;

            /* Neutrals */
            --color-white: #ffffff;
            --color-gray-50: #f9fafb;
            --color-gray-100: #f3f4f6;
            --color-gray-200: #e5e7eb;
            --color-gray-300: #d1d5db;
            --color-gray-400: #9ca3af;
            --color-gray-500: #6b7280;
            --color-gray-600: #4b5563;
            --color-gray-700: #374151;
            --color-gray-800: #1f2937;
            --color-gray-900: #111827;

            /* Spacing */
            --spacing-xs: 0.25rem;
            --spacing-sm: 0.5rem;
            --spacing-md: 1rem;
            --spacing-lg: 1.5rem;
            --spacing-xl: 2rem;
            --spacing-2xl: 3rem;

            /* Border Radius */
            --radius-sm: 0.375rem;
            --radius-md: 0.5rem;
            --radius-lg: 0.75rem;
            --radius-xl: 1rem;
            --radius-full: 9999px;

            /* Shadows */
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

            /* Transitions */
            --transition-fast: 150ms ease;
            --transition-normal: 250ms ease;
        }

        body {
            /* System font stack - no external requests, maximum privacy */
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
            min-height: 100vh;
            color: var(--color-gray-800);
            line-height: 1.6;
            padding: var(--spacing-lg);
        }

        /* ================================================================
           LAYOUT
           ================================================================ */
        .container {
            max-width: 640px;
            margin: 0 auto;
            padding: var(--spacing-2xl) var(--spacing-xl);
        }

        .card {
            background: var(--color-white);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-xl);
            padding: var(--spacing-2xl);
            position: relative;
            overflow: hidden;
        }

        /* Decorative gradient accent */
        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
        }

        /* ================================================================
           TYPOGRAPHY
           ================================================================ */
        .header {
            text-align: center;
            margin-bottom: var(--spacing-2xl);
        }

        .title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-gray-900);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.025em;
        }

        .subtitle {
            font-size: 1rem;
            color: var(--color-gray-500);
            font-weight: 400;
        }

        /* ================================================================
           FORM ELEMENTS
           ================================================================ */
        .form-group {
            margin-bottom: var(--spacing-lg);
        }

        .form-label {
            display: block;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--color-gray-700);
            margin-bottom: var(--spacing-sm);
        }

        .form-textarea {
            width: 100%;
            min-height: 120px;
            padding: var(--spacing-md);
            border: 2px solid var(--color-gray-200);
            border-radius: var(--radius-lg);
            font-family: inherit;
            font-size: 1rem;
            color: var(--color-gray-800);
            background: var(--color-white);
            resize: vertical;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .form-textarea:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
        }

        .form-textarea::placeholder {
            color: var(--color-gray-400);
        }

        /* ================================================================
           BUTTONS
           ================================================================ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-sm);
            padding: var(--spacing-md) var(--spacing-xl);
            font-family: inherit;
            font-size: 1rem;
            font-weight: 600;
            border: none;
            border-radius: var(--radius-lg);
            cursor: pointer;
            transition: all var(--transition-fast);
            text-decoration: none;
        }

        .btn-primary {
            width: 100%;
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            color: var(--color-white);
            box-shadow: var(--shadow-md), 0 4px 14px 0 rgba(99, 102, 241, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg), 0 6px 20px 0 rgba(99, 102, 241, 0.4);
        }

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

        .btn-secondary {
            background: var(--color-gray-100);
            color: var(--color-gray-700);
            padding: var(--spacing-sm) var(--spacing-md);
            font-size: 0.875rem;
        }

        .btn-secondary:hover {
            background: var(--color-gray-200);
        }

        .btn-icon {
            width: 20px;
            height: 20px;
        }

        /* ================================================================
           RESULT SECTION
           ================================================================ */
        .result-section {
            margin-top: var(--spacing-xl);
            padding-top: var(--spacing-xl);
            border-top: 1px solid var(--color-gray-200);
        }

        .result-box {
            background: var(--color-gray-50);
            border: 2px solid var(--color-gray-200);
            border-radius: var(--radius-lg);
            padding: var(--spacing-md);
            margin-bottom: var(--spacing-md);
        }

        .result-box.success {
            background: var(--color-success-light);
            border-color: var(--color-success);
        }

        .result-label {
            display: block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--color-gray-500);
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: var(--spacing-xs);
        }

        .result-url {
            width: 100%;
            padding: var(--spacing-md);
            background: var(--color-white);
            border: 1px solid var(--color-gray-200);
            border-radius: var(--radius-md);
            font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
            font-size: 0.875rem;
            color: var(--color-gray-800);
            word-break: break-all;
            resize: none;
            min-height: 80px;
        }

        .result-url:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
        }

        .result-actions {
            display: flex;
            gap: var(--spacing-sm);
            flex-wrap: wrap;
        }

        /* ================================================================
           MESSAGES
           ================================================================ */
        .message {
            padding: var(--spacing-md);
            border-radius: var(--radius-md);
            margin-bottom: var(--spacing-md);
            font-size: 0.875rem;
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-sm);
        }

        .message-error {
            background: var(--color-error-light);
            color: var(--color-error);
            border: 1px solid var(--color-error);
        }

        .message-success {
            background: var(--color-success-light);
            color: #065f46;
            border: 1px solid var(--color-success);
        }

        .message-warning {
            background: var(--color-warning-light);
            color: #92400e;
            border: 1px solid var(--color-warning);
        }

        .message-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
        }

        /* ================================================================
           REMOVED PARAMS INFO
           ================================================================ */
        .params-removed {
            margin-top: var(--spacing-md);
        }

        .params-label {
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--color-gray-600);
            margin-bottom: var(--spacing-sm);
        }

        .params-list {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-xs);
        }

        .param-tag {
            display: inline-flex;
            align-items: center;
            padding: var(--spacing-xs) var(--spacing-sm);
            background: var(--color-error-light);
            color: var(--color-error);
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 500;
            font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
        }

        /* ================================================================
           COPY NOTIFICATION
           ================================================================ */
        .copy-toast {
            position: fixed;
            bottom: var(--spacing-xl);
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background: var(--color-gray-800);
            color: var(--color-white);
            padding: var(--spacing-sm) var(--spacing-lg);
            border-radius: var(--radius-full);
            font-size: 0.875rem;
            font-weight: 500;
            opacity: 0;
            transition: all var(--transition-normal);
            z-index: 1000;
            box-shadow: var(--shadow-lg);
        }

        .copy-toast.show {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }

        /* ================================================================
           FOOTER
           ================================================================ */
        .footer {
            text-align: center;
            margin-top: var(--spacing-xl);
            font-size: 0.875rem;
            color: var(--color-gray-400);
        }

        .footer a {
            color: var(--color-primary);
            text-decoration: none;
        }

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

        /* ================================================================
           RESPONSIVE DESIGN
           ================================================================ */
        @media (max-width: 640px) {
            body {
                padding: var(--spacing-md);
            }

            .container {
                padding: var(--spacing-lg) var(--spacing-md);
            }

            .card {
                padding: var(--spacing-lg);
            }

            .title {
                font-size: 1.5rem;
            }

            .subtitle {
                font-size: 0.875rem;
            }

            .result-actions {
                flex-direction: column;
            }

            .btn-secondary {
                width: 100%;
            }
        }

        /* ================================================================
           ANIMATIONS
           ================================================================ */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .result-section {
            animation: fadeIn 0.3s ease-out;
        }

        .no-link {
            color: inherit;
            text-decoration: none;
        }