@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

        /* ==========================================
           CSS VARIABLES - Design System
           ========================================== */
        :root {
            /* Primary Palette - Slate */
            --primary-900: #0f172a;
            --primary-800: #111827;
            --primary-700: #1f2937;
            --primary-600: #334155;
            --primary-500: #475569;
            --primary-400: #64748b;
            --primary-300: #94a3b8;
            --primary-200: #cbd5e1;
            --primary-100: #e2e8f0;
            --primary-50: #f1f5f9;
            --header-bg: #153058;
            --hero-bg: #1a3d6e;

            /* Accent - Cloud Blue */
            --accent-500: #2563eb;
            --accent-400: #3b82f6;
            --accent-300: #60a5fa;
            --accent-glow: rgba(37, 99, 235, 0.25);

            /* Neutrals */
            --gray-900: #111827;
            --gray-800: #1f2937;
            --gray-700: #374151;
            --gray-600: #4b5563;
            --gray-500: #6b7280;
            --gray-400: #9ca3af;
            --gray-300: #d1d5db;
            --gray-200: #e5e7eb;
            --gray-100: #f3f4f6;
            --gray-50: #f8fafc;

            /* Semantic */
            --success: #10b981;
            --warning: #f59e0b;
            --error: #ef4444;

            /* Shadows */
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            --shadow-glow: 0 0 40px rgba(0, 212, 170, 0.15);

            /* Typography */
            --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
            --font-body: 'Space Grotesk', 'Segoe UI', sans-serif;

            /* Spacing */
            --space-1: 0.25rem;
            --space-2: 0.5rem;
            --space-3: 0.75rem;
            --space-4: 1rem;
            --space-5: 1.25rem;
            --space-6: 1.5rem;
            --space-8: 2rem;
            --space-10: 2.5rem;
            --space-12: 3rem;

            /* Border Radius */
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --radius-full: 9999px;

            /* Transitions */
            --transition-fast: 150ms ease;
            --transition-base: 250ms ease;
            --transition-slow: 400ms ease;
        }

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

        html {
            height: 100%;
            -webkit-text-size-adjust: 100%;
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.6;
            color: #0f172a;
            background: #f8fafc;
            min-height: 100%;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

        /* ==========================================
           HEADER - CloudToolStack-inspired
           ========================================== */
        header {
            position: sticky;
            top: 0;
            height: 64px;
            background: var(--header-bg);
            z-index: 1000;
            box-shadow: 0 4px 18px rgba(15, 23, 42, 0.18);
            border-bottom: 1px solid rgba(148, 163, 184, 0.2);
        }

        .header-content {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 var(--space-4);
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .logo-container {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            text-decoration: none;
            transition: opacity var(--transition-fast);
        }

        .logo-container:hover {
            opacity: 0.92;
        }

        .calculator-icon {
            width: 32px;
            height: 40px;
            background: white;
            border-radius: 6px;
            padding: 3px;
            box-shadow: 0 1px 4px rgba(15, 23, 42, 0.2);
            flex-shrink: 0;
        }

        .calc-screen {
            background: #1a1a1a;
            color: #00ff00;
            font-family: 'Courier New', monospace;
            font-size: 8px;
            font-weight: bold;
            text-align: right;
            padding: 2px 4px;
            border-radius: 2px;
            margin-bottom: 2px;
            height: 10px;
            display: flex;
            align-items: center;
            justify-content: flex-end;
        }

        .calc-buttons {
            display: flex;
            flex-direction: column;
            gap: 1px;
        }

        .calc-row {
            display: flex;
            gap: 1px;
        }

        .calc-btn {
            width: 5px;
            height: 5px;
            background: #f0f0f0;
            border-radius: 1px;
            border: 0.5px solid #ddd;
        }

        .calc-btn:nth-child(1) { background: #ff6b6b; }
        .calc-btn:nth-child(2) { background: #4ecdc4; }
        .calc-btn:nth-child(3) { background: #45b7d1; }
        .calc-btn:nth-child(4) { background: #96ceb4; }

        .logo-text {
            color: #f8fafc;
            font-size: 20px;
            font-weight: 700;
            font-family: var(--font-display);
            letter-spacing: 0.2px;
            text-shadow: none;
        }

        /* Search Bar */
        .search-bar-wrapper {
            flex: 1;
            max-width: 420px;
            margin: 0 var(--space-4);
            position: relative;
        }

        .search-bar {
            position: relative;
            width: 100%;
        }

        .search-bar-input {
            width: 100%;
            padding: 10px 16px 10px 40px;
            border-radius: var(--radius-full);
            border: 1px solid var(--gray-200);
            font-size: 14px;
            color: #0f172a;
            background: #ffffff;
            outline: none;
            transition: all var(--transition-fast);
        }

        .search-bar-input:focus {
            border-color: var(--accent-400);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
        }

        .search-bar::before {
            content: "\f002";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            position: absolute;
            left: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-400);
            font-size: 13px;
            pointer-events: none;
        }

        /* Navigation */
        nav {
            display: flex;
            gap: var(--space-2);
            align-items: center;
            height: 64px;
        }

        .nav-button {
            background: transparent;
            color: #cbd5f5;
            border: none;
            padding: 8px 12px;
            text-decoration: none;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.3px;
            border-radius: var(--radius-md);
            transition: all var(--transition-fast);
        }

        .nav-button:hover {
            background: rgba(148, 163, 184, 0.18);
            color: #f8fafc;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 10px;
        }

        .nav-toggle div,
        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: #cbd5f5;
            border-radius: 2px;
            transition: all var(--transition-fast);
        }

        /* ==========================================
           MAIN CONTAINER
           ========================================== */
        .page-container {
            flex: 1;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: var(--space-6);
            max-width: 1280px;
            margin: 0 auto;
            padding: var(--space-6);
            width: 100%;
        }

        .main-content {
            min-width: 0;
        }

        /* Breadcrumb */
        .breadcrumb {
            font-size: 13px;
            color: var(--primary-400);
            margin-bottom: var(--space-4);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .breadcrumb a {
            color: var(--accent-500);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        .breadcrumb a:hover {
            color: var(--accent-400);
            text-decoration: underline;
        }

        .breadcrumb span {
            color: var(--gray-400);
        }

        /* ==========================================
           CALCULATOR CARD
           ========================================== */
        .calculator-card {
            background: white;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 14px 28px rgba(15, 23, 42, 0.08);
            border: 1px solid var(--gray-200);
            position: relative;
        }

        .calculator-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--accent-500);
        }

        .calculator-header {
            background: var(--hero-bg);
            padding: var(--space-6) var(--space-6) var(--space-5);
            position: relative;
            overflow: hidden;
        }

        .calculator-header::before {
            display: none;
        }

        .calculator-header h1 {
            font-family: var(--font-display);
            font-size: 26px;
            font-weight: 700;
            color: #f8fafc;
            margin: 0;
            position: relative;
            display: flex;
            align-items: center;
            gap: var(--space-3);
        }

        .calculator-header h1 .icon {
            width: 44px;
            height: 44px;
            background: var(--accent-500);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            box-shadow: 0 6px 14px rgba(37, 99, 235, 0.3);
        }

        .calculator-header p {
            color: #cbd5e1;
            font-size: 15px;
            margin: var(--space-3) 0 0;
            position: relative;
            max-width: 100%;
        }

        .calculator-body {
            padding: var(--space-6);
        }

        /* ==========================================
           CALCULATOR LAYOUT
           ========================================== */
        .calculator-layout {
            display: grid;
            grid-template-columns: 1fr 280px;
            gap: var(--space-6);
            align-items: start;
        }

        .calculator-inputs {
            min-width: 0;
        }

        /* ==========================================
           INPUT GRID
           ========================================== */
        .input-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-4) var(--space-5);
        }

        .input-group {
            display: flex;
            flex-direction: column;
        }

        .input-group.full-width {
            grid-column: 1 / -1;
        }

        .input-label {
            font-size: 13px;
            font-weight: 600;
            color: #334155;
            margin-bottom: var(--space-2);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .input-label .hint-icon {
            width: 16px;
            height: 16px;
            background: var(--gray-200);
            color: var(--gray-500);
            border-radius: 50%;
            font-size: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: help;
            transition: all var(--transition-fast);
        }

        .input-label .hint-icon:hover {
            background: var(--accent-500);
            color: white;
        }

        .input-wrapper {
            position: relative;
            display: flex;
            gap: var(--space-2);
            align-items: center;
        }

        .input-field {
            flex: 1;
            width: 100%;
            min-width: 0;
            padding: var(--space-4);
            padding-right: calc(var(--space-12) + 4px);
            font-size: 16px;
            font-family: var(--font-body);
            font-weight: 500;
            color: #0f172a;
            background: #ffffff;
            border: 1px solid var(--gray-200);
            border-radius: var(--radius-md);
            outline: none;
            transition: all var(--transition-fast);
            -moz-appearance: textfield;
        }

        .input-field::-webkit-outer-spin-button,
        .input-field::-webkit-inner-spin-button {
            -webkit-appearance: none;
            margin: 0;
        }

        .input-field:hover {
            border-color: var(--gray-300);
        }

        .input-field:focus {
            border-color: var(--accent-400);
            background: white;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
        }

        .prefix,
        .suffix {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            font-size: 14px;
            font-weight: 600;
            color: var(--gray-500);
            pointer-events: none;
            white-space: nowrap;
            line-height: 1;
        }

        .prefix {
            left: var(--space-4);
        }

        .suffix {
            right: var(--space-4);
        }

        .input-wrapper .prefix ~ .input-field {
            padding-left: calc(var(--space-10) + 4px);
        }

        /* Select styling */
        .select-field {
            min-width: 120px;
            padding: var(--space-4);
            font-size: 16px;
            font-family: var(--font-body);
            font-weight: 500;
            color: var(--gray-800);
            background: var(--gray-50);
            border: 2px solid var(--gray-200);
            border-radius: var(--radius-md);
            outline: none;
            cursor: pointer;
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right var(--space-3) center;
            padding-right: calc(var(--space-8) + 8px);
            transition: all var(--transition-fast);
        }

        .select-field:hover {
            border-color: var(--gray-300);
        }

        .select-field:focus {
            border-color: var(--primary-500);
            background-color: white;
            box-shadow: 0 0 0 4px rgba(30, 77, 140, 0.1);
        }

        /* Quick Facts Panel */
        .quick-facts {
            background: linear-gradient(135deg, var(--primary-50) 0%, #f0f7ff 100%);
            border: 1px solid var(--primary-200);
            border-radius: var(--radius-lg);
            padding: var(--space-5);
        }

        .quick-facts h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary-700);
            margin: 0 0 var(--space-4);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .quick-facts h4 i {
            color: var(--accent-500);
        }

        .fact-item {
            padding: var(--space-3) 0;
            border-bottom: 1px solid var(--primary-100);
        }

        .fact-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .fact-item .fact-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--gray-500);
            margin-bottom: 2px;
        }

        .fact-item .fact-value {
            font-size: 15px;
            font-weight: 600;
            color: var(--primary-700);
        }

        .fact-item .fact-note {
            font-size: 11px;
            color: var(--gray-500);
            margin-top: 2px;
        }

        /* ==========================================
           BUTTONS
           ========================================== */
        .button-group {
            display: flex;
            gap: var(--space-3);
            margin-top: var(--space-6);
        }

        .btn {
            flex: 1;
            padding: var(--space-4) var(--space-6);
            font-size: 16px;
            font-family: var(--font-body);
            font-weight: 600;
            border: none;
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--space-2);
        }

        .btn-primary {
            background: var(--accent-500);
            color: white;
            box-shadow: 0 8px 18px rgba(37, 99, 235, 0.25);
        }

        .btn-primary:hover {
            background: var(--accent-400);
            transform: translateY(-1px);
            box-shadow: 0 10px 22px rgba(37, 99, 235, 0.32);
        }

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

        .btn-secondary {
            background: #f1f5f9;
            color: #475569;
            border: 1px solid var(--gray-200);
        }

        .btn-secondary:hover {
            background: #e2e8f0;
            border-color: var(--gray-300);
        }

        /* ==========================================
           RESULTS SECTION
           ========================================== */
        .results-section {
            margin-top: var(--space-8);
            display: none;
            animation: slideUp 0.4s ease-out;
        }

        .results-section.visible {
            display: block;
        }

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

        .results-header {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            margin-bottom: var(--space-6);
            padding-bottom: var(--space-4);
            border-bottom: 2px solid var(--gray-100);
        }

        .results-header h2 {
            font-family: var(--font-display);
            font-size: 20px;
            font-weight: 600;
            color: var(--gray-800);
            margin: 0;
        }

        .results-header .badge {
            background: var(--accent-500);
            color: white;
            font-size: 11px;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: var(--radius-full);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        /* Results cards */
        .results-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-4);
        }

        .result-card {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: var(--radius-lg);
            padding: var(--space-5);
            text-align: center;
            transition: all var(--transition-fast);
        }

        .result-card:hover {
            border-color: #cbd5f5;
            box-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
        }

        .result-card.highlight {
            background: #e0e7ff;
            border-color: #c7d2fe;
        }

        .result-card .label {
            font-size: 12px;
            font-weight: 600;
            color: var(--gray-500);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: var(--space-2);
        }

        .result-card .value {
            font-family: var(--font-display);
            font-size: 26px;
            font-weight: 700;
            color: #1e3a8a;
            line-height: 1.2;
        }

        .result-card.highlight .value {
            color: #1d4ed8;
        }

        .result-card .subtext {
            font-size: 12px;
            color: var(--gray-500);
            margin-top: var(--space-1);
        }

        /* Risk indicator */
        .risk-indicator {
            margin-top: var(--space-6);
            padding: var(--space-5);
            border-radius: var(--radius-lg);
            text-align: center;
        }

        .risk-indicator.low {
            background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
            border: 1px solid #86efac;
        }

        .risk-indicator.moderate {
            background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
            border: 1px solid #fcd34d;
        }

        .risk-indicator.high {
            background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
            border: 1px solid #fca5a5;
        }

        .risk-indicator.extreme {
            background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
            border: 1px solid #f87171;
        }

        .risk-indicator h3 {
            font-size: 18px;
            margin: 0 0 var(--space-2);
        }

        .risk-indicator.low h3 { color: #166534; }
        .risk-indicator.moderate h3 { color: #92400e; }
        .risk-indicator.high h3 { color: #991b1b; }
        .risk-indicator.extreme h3 { color: #7f1d1d; }

        .risk-indicator p {
            font-size: 14px;
            color: var(--gray-600);
            margin: 0;
        }

        /* ==========================================
           COPY/SHARE SECTION
           ========================================== */
        .share-section {
            margin-top: var(--space-8);
            padding-top: var(--space-6);
            border-top: 1px solid var(--gray-200);
            text-align: center;
        }

        .share-section p {
            font-size: 13px;
            color: var(--gray-500);
            margin-bottom: var(--space-4);
        }

        .share-buttons {
            display: flex;
            justify-content: center;
            gap: var(--space-3);
        }

        .share-btn {
            padding: var(--space-3) var(--space-5);
            font-size: 13px;
            font-weight: 600;
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: all var(--transition-fast);
            display: flex;
            align-items: center;
            gap: var(--space-2);
            border: none;
        }

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

        .share-btn.widget:hover {
            background: #0ea572;
        }

        .share-btn.link {
            background: var(--primary-500);
            color: white;
        }

        .share-btn.link:hover {
            background: var(--primary-400);
        }

        /* ==========================================
           CONTENT SECTION
           ========================================== */
        .content-section {
            margin-top: var(--space-8);
            background: white;
            border-radius: var(--radius-xl);
            padding: var(--space-8);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--gray-200);
        }

        .content-section h2 {
            font-family: var(--font-display);
            font-size: 22px;
            font-weight: 600;
            color: var(--gray-800);
            margin: 0 0 var(--space-4);
        }

        .content-section h3 {
            font-family: var(--font-display);
            font-size: 18px;
            font-weight: 600;
            color: var(--gray-800);
            margin: var(--space-6) 0 var(--space-3);
        }

        .content-section p {
            color: var(--gray-600);
            margin-bottom: var(--space-4);
        }

        .content-section ul {
            color: var(--gray-600);
            margin: var(--space-4) 0;
            padding-left: var(--space-6);
        }

        .content-section li {
            margin-bottom: var(--space-2);
        }

        /* Formula box */
        .formula-box {
            background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
            border: 1px solid var(--primary-200);
            border-radius: var(--radius-lg);
            padding: var(--space-6);
            margin: var(--space-6) 0;
            text-align: center;
        }

        .formula-box code {
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 16px;
            color: var(--primary-700);
            font-weight: 600;
            display: block;
            word-break: break-word;
        }

        .formula-box .legend {
            margin-top: var(--space-4);
            font-size: 13px;
            color: var(--gray-600);
        }

        .formula-box .legend-item {
            display: inline-block;
            margin: var(--space-1) var(--space-3);
        }

        /* Key Takeaways Box */
        .key-takeaways {
            background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
            border: 1px solid #86efac;
            border-left: 4px solid #22c55e;
            border-radius: var(--radius-lg);
            padding: var(--space-5);
            margin-bottom: var(--space-8);
        }

        .key-takeaways h3 {
            color: #166534;
            font-size: 16px;
            margin: 0 0 var(--space-3);
        }

        .key-takeaways h3 i {
            color: #22c55e;
            margin-right: var(--space-2);
        }

        .key-takeaways ul {
            margin: 0;
            padding-left: var(--space-5);
        }

        .key-takeaways li {
            margin-bottom: var(--space-2);
            color: var(--gray-700);
        }

        /* Warning Box */
        .warning-box {
            background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
            border: 1px solid #fca5a5;
            border-left: 4px solid #ef4444;
            border-radius: var(--radius-lg);
            padding: var(--space-5);
            margin: var(--space-5) 0;
        }

        .warning-box h4 {
            color: #991b1b;
            font-size: 14px;
            margin: 0 0 var(--space-3);
        }

        .warning-box h4 i {
            color: #ef4444;
            margin-right: var(--space-2);
        }

        .warning-box p {
            margin: 0;
            color: var(--gray-700);
            font-size: 14px;
        }

        .insight-box {
            background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
            border: 1px solid #93c5fd;
            border-left: 4px solid #3b82f6;
            border-radius: var(--radius-lg);
            padding: var(--space-5);
            margin: var(--space-6) 0;
        }

        .insight-box h4 {
            color: #1e40af;
            font-size: 15px;
            margin: 0 0 var(--space-3);
        }

        .insight-box h4 i {
            color: #2563eb;
            margin-right: var(--space-2);
        }

        .insight-box p {
            margin: 0;
            color: var(--gray-700);
            font-size: 14px;
        }

        .comparison-table-wrapper {
            overflow-x: auto;
            margin: var(--space-5) 0;
            border: 1px solid var(--gray-200);
            border-radius: var(--radius-md);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 640px;
            margin: 0;
            font-size: 14px;
        }

        .comparison-table th,
        .comparison-table td {
            border-bottom: 1px solid var(--gray-200);
            padding: var(--space-3);
            text-align: left;
            vertical-align: top;
        }

        .comparison-table tr:last-child td {
            border-bottom: none;
        }

        .comparison-table th {
            background: var(--primary-50);
            color: var(--primary-700);
            font-weight: 600;
        }

        .comparison-table td {
            color: var(--gray-700);
        }

        /* ==========================================
           SIDEBAR
           ========================================== */
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: var(--space-5);
        }

        .sidebar-card {
            background: white;
            border-radius: var(--radius-lg);
            padding: var(--space-5);
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
            border: 1px solid var(--gray-200);
        }

        .sidebar-card h3 {
            font-size: 14px;
            font-weight: 600;
            color: var(--gray-800);
            margin: 0 0 var(--space-4);
            display: flex;
            align-items: center;
            gap: var(--space-2);
        }

        .sidebar-card h3 i {
            color: var(--accent-500);
        }

        /* Quick tools */
        .quick-tool {
            margin-bottom: var(--space-4);
            padding-bottom: var(--space-4);
            border-bottom: 1px solid var(--gray-100);
        }

        .quick-tool:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }

        .quick-tool label {
            font-size: 12px;
            font-weight: 500;
            color: var(--gray-500);
            margin-bottom: var(--space-2);
            display: block;
        }

        .quick-tool-inputs {
            display: flex;
            gap: var(--space-2);
            align-items: center;
            width: 100%;
        }

        .quick-tool-inputs input,
        .quick-tool-inputs select {
            flex: 1;
            min-width: 0;
            max-width: 100%;
            padding: var(--space-2) var(--space-3);
            border: 1px solid var(--gray-200);
            border-radius: var(--radius-sm);
            font-size: 13px;
            box-sizing: border-box;
        }

        .quick-tool-inputs span {
            flex-shrink: 0;
            font-size: 12px;
            color: var(--gray-500);
        }

        .quick-tool-result {
            margin-top: var(--space-2);
            padding: var(--space-2) var(--space-3);
            background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-weight: 600;
            color: #047857;
            text-align: center;
        }

        /* Popular calculators */
        .popular-calc-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-2);
        }

        .popular-calc-item {
            display: flex;
            align-items: center;
            gap: var(--space-3);
            padding: var(--space-3);
            background: var(--gray-50);
            border-radius: var(--radius-md);
            text-decoration: none;
            color: var(--gray-700);
            font-size: 13px;
            transition: all var(--transition-fast);
            border: 1px solid transparent;
        }

        .popular-calc-item:hover {
            background: #f1f5f9;
            border-color: #e2e8f0;
            color: #1d4ed8;
            transform: translateX(4px);
        }

        .popular-calc-item i {
            color: var(--accent-500);
            width: 18px;
            text-align: center;
        }

        /* Related calculators grid */
        .related-section {
            background: white;
            border-radius: var(--radius-lg);
            padding: var(--space-5);
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
            border: 1px solid var(--gray-200);
        }

        .related-header {
            background: transparent;
            color: #0f172a;
            padding: 0;
            margin: 0 0 var(--space-4);
            border-radius: 0;
            font-weight: 600;
            font-size: 14px;
            text-align: left;
        }

        .related-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: var(--space-2);
        }

        .related-grid a {
            font-size: 13px;
            color: var(--primary-700);
            text-decoration: none;
            padding: var(--space-2) var(--space-3);
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            transition: all var(--transition-fast);
        }

        .related-grid a:hover {
            background: #f1f5f9;
            color: #1d4ed8;
            border-color: #e2e8f0;
        }

        /* Link list used for pairs/related/more */
        .link-list {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: var(--space-2);
        }

        .link-list a {
            display: block;
            font-size: 13px;
            color: var(--primary-700);
            text-decoration: none;
            padding: var(--space-2) var(--space-3);
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            background: #f8fafc;
            transition: all var(--transition-fast);
        }

        .link-list a:hover {
            background: #f1f5f9;
            color: #1d4ed8;
            border-color: #e2e8f0;
        }

        .related-footer {
            margin-top: var(--space-4);
            padding-top: var(--space-4);
            border-top: 1px solid var(--gray-100);
            text-align: center;
        }

        .related-footer a {
            color: var(--accent-500);
            text-decoration: none;
            font-size: 13px;
        }

        /* ==========================================
           FOOTER
           ========================================== */
        footer {
            background: var(--header-bg);
            border-top: 1px solid rgba(148, 163, 184, 0.2);
            padding: var(--space-8) var(--space-6);
            text-align: center;
            color: var(--primary-100);
            margin-top: auto;
        }

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

        footer a:hover {
            opacity: 0.8;
            text-decoration: underline;
        }

        /* ==========================================
           TOAST NOTIFICATION
           ========================================== */
        .toast {
            position: fixed;
            bottom: 24px;
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background: var(--gray-900);
            color: white;
            padding: var(--space-4) var(--space-6);
            border-radius: var(--radius-md);
            font-size: 14px;
            font-weight: 500;
            box-shadow: var(--shadow-xl);
            z-index: 9999;
            opacity: 0;
            transition: all var(--transition-base);
        }

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

        /* ==========================================
           RESPONSIVE STYLES
           ========================================== */
        @media (max-width: 1180px) {
            .calculator-layout {
                grid-template-columns: 1fr;
            }

            .quick-facts {
                margin-top: var(--space-2);
            }
        }

        @media (max-width: 1024px) {
            .page-container {
                grid-template-columns: 1fr 280px;
            }
        }

        @media (max-width: 900px) {
            .page-container {
                grid-template-columns: 1fr;
            }

            .sidebar {
                display: none;
            }

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

        @media (max-width: 768px) {
            .nav-toggle {
                display: flex;
            }

            nav {
                display: none;
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--header-bg);
                flex-direction: column;
                padding: var(--space-4);
                box-shadow: 0 8px 24px rgba(15, 23, 42, 0.35);
            }

            nav.show {
                display: flex;
            }

            nav .nav-button {
                width: 100%;
                padding: var(--space-4);
                text-align: center;
                background: rgba(148, 163, 184, 0.15);
                border-radius: var(--radius-md);
                margin: var(--space-1) 0;
            }

            .search-bar-wrapper {
                flex: 1;
                max-width: none;
                margin: 0 var(--space-3);
            }

            .logo-text {
                font-size: 18px;
            }

            .page-container {
                padding: var(--space-4);
            }

            .calculator-header {
                padding: var(--space-6);
            }

            .calculator-header h1 {
                font-size: 22px;
            }

            .calculator-body {
                padding: var(--space-5);
            }

            .calculator-layout {
                grid-template-columns: 1fr;
            }

            .quick-facts {
                display: none;
            }

            .input-grid {
                grid-template-columns: 1fr;
                gap: var(--space-4);
            }

            .button-group {
                flex-direction: column;
            }

            .results-grid {
                grid-template-columns: 1fr;
            }

            .result-card .value {
                font-size: 22px;
            }

            .share-buttons {
                flex-direction: column;
            }

            .share-btn {
                width: 100%;
                justify-content: center;
            }

            .breadcrumb {
                display: none;
            }
        }

        @media (max-width: 480px) {
            .calculator-header h1 {
                font-size: 20px;
            }

            .calculator-header h1 .icon {
                width: 36px;
                height: 36px;
                font-size: 16px;
            }

            .content-section {
                padding: var(--space-5);
            }

            footer {
                font-size: 13px;
            }
        }


        /* Sidebar share block */
        .social-share {
            display: grid;
            grid-template-columns: repeat(4, minmax(0, 1fr));
            gap: var(--space-2);
        }

        .social-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 36px;
            border-radius: var(--radius-sm);
            color: white;
            text-decoration: none;
            transition: transform var(--transition-fast), filter var(--transition-fast);
        }

        .social-share a:hover {
            transform: translateY(-1px);
            filter: brightness(1.05);
        }

        .social-share .facebook { background: #1877f2; }
        .social-share .twitter { background: #1da1f2; }
        .social-share .email { background: var(--gray-600); }
        .social-share .linkedin { background: #0a66c2; }