:root {
            color-scheme: dark;
            --bg: #07130e;
            --bg-surface: #0c1c15;
            --bg-card: rgba(15, 33, 26, 0.94);
            --card-gradient: linear-gradient(135deg, rgba(16, 36, 29, 0.96) 0%, rgba(9, 23, 18, 0.98) 100%);
            --surface-border: rgba(47, 211, 154, 0.22);
            --border-subtle: rgba(255, 255, 255, 0.08);
            --brand: #00a878;
            --brand-deep: #00795a;
            --brand-light: #2fd39a;
            --brand-glow: #7ee6c0;
            --emerald: #00a878;
            --emerald-light: #2fd39a;
            --emerald-gradient: linear-gradient(135deg, #00a878 0%, #2fd39a 100%);
            --gold: #f0b856;
            --gold-light: #fbbf24;
            --indigo: #00a878;
            --indigo-light: #7ee6c0;
            --cyan: #2fd39a;
            --text-primary: #f0f7f4;
            --text-secondary: #a5c0b6;
            --text-muted: #74938a;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            --mono: 'JetBrains Mono', monospace;
        }

        *, *::before, *::after {
            box-sizing: border-box;
            max-width: 100%;
        }

        body {
            background-color: var(--bg);
            color: var(--text-primary);
            font-family: var(--font);
            line-height: 1.65;
            margin: 0;
            padding: 0;
            min-height: 100vh;
            overflow-x: hidden;
            font-variant-numeric: tabular-nums;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(10, 24, 19, 0.95);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(47, 211, 154, 0.16);
            padding: 12px 20px;
        }

        .header-inner {
            max-width: 1120px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 800;
            font-size: 1.15rem;
            color: #fff;
            text-decoration: none;
            letter-spacing: -0.02em;
        }

        .brand-logo .brand-icon {
            font-size: 1.35rem;
        }

        .brand-logo .accent {
            color: var(--brand-light);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .nav-link {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.9rem;
            font-weight: 600;
            transition: color 0.2s;
        }

        .nav-link:hover {
            color: #fff;
        }

        .btn-launch-os {
            background: linear-gradient(135deg, var(--brand), var(--brand-light));
            color: #fff;
            font-weight: 800;
            font-size: 0.85rem;
            padding: 8px 16px;
            border-radius: 30px;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            min-height: 44px;
            box-shadow: 0 4px 14px rgba(0, 168, 120, 0.35);
        }

        .main-container {
            max-width: 960px;
            margin: 0 auto;
            padding: 36px 20px 80px 20px;
        }

        .hero-section {
            text-align: center;
            margin-bottom: 32px;
        }

        .badge-kicker {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(47, 211, 154, 0.14);
            border: 1px solid rgba(47, 211, 154, 0.35);
            color: #7ee6c0;
            font-size: 0.8rem;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 14px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        h1 {
            font-size: clamp(1.85rem, 4vw, 2.6rem);
            font-weight: 900;
            line-height: 1.22;
            letter-spacing: -0.03em;
            margin-bottom: 12px;
        }

        .lead-p {
            font-size: 1.125rem;
            color: var(--text-secondary);
            max-width: 720px;
            margin: 0 auto 28px auto;
        }

        .calculator-card {
            background: var(--card-gradient);
            border: 1.5px solid var(--surface-border);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.55);
            margin-bottom: 40px;
            position: relative;
            overflow: hidden;
        }

        .calculator-card::before {
            content: '';
            position: absolute;
            inset: 0 0 auto 0;
            height: 4px;
            background: linear-gradient(90deg, var(--brand), var(--gold));
        }

        .calc-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-bottom: 24px;
        }

        .input-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .input-label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-secondary);
        }

        .calc-input {
            background: rgba(5, 16, 12, 0.65);
            border: 1.5px solid rgba(47, 211, 154, 0.28);
            color: #fff;
            padding: 12px 14px;
            border-radius: var(--radius-md);
            font-size: 1.05rem;
            font-family: var(--mono);
            min-height: 48px;
            outline: none;
            transition: border-color 0.2s, box-shadow 0.2s;
            touch-action: manipulation;
            width: 100%;
        }

        .calc-input:focus, .calc-input:focus-visible {
            border-color: var(--brand-light);
            box-shadow: 0 0 0 3px rgba(47, 211, 154, 0.25);
        }

        .calc-input::placeholder {
            color: var(--text-muted);
        }

        select.calc-input, select[class*="calc"] {
            cursor: pointer;
        }

        .results-panel {
            background: rgba(47, 211, 154, 0.08);
            border: 1.5px solid rgba(47, 211, 154, 0.25);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .kpi-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 16px;
        }

        .kpi-box {
            background: rgba(0, 0, 0, 0.35);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            padding: 14px;
            text-align: center;
        }

        .kpi-label {
            font-size: 0.78rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-muted);
            margin-bottom: 4px;
        }

        .kpi-val {
            font-family: var(--mono);
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
        }

        .kpi-val.highlight {
            color: var(--gold-light);
        }

        .share-bar {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 10px;
            margin-top: 8px;
            flex-wrap: wrap;
        }

        .share-btn {
            background: rgba(255, 255, 255, 0.07);
            border: 1px solid var(--border-subtle);
            color: var(--text-secondary);
            font-size: 0.82rem;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 20px;
            cursor: pointer;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            touch-action: manipulation;
        }

        .share-btn:hover {
            color: #fff;
            background: rgba(47, 211, 154, 0.15);
            border-color: var(--brand-light);
        }

        .editorial-section {
            margin-top: 48px;
        }

        .editorial-section h2 {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
            color: #fff;
        }

        .editorial-section h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-top: 28px;
            margin-bottom: 12px;
            color: var(--gold-light);
        }

        .editorial-section p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 20px;
        }

        .table-wrap {
            overflow-x: auto;
            margin: 24px 0;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-subtle);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.92rem;
            text-align: left;
        }

        th {
            background: rgba(47, 211, 154, 0.1);
            color: #7ee6c0;
            padding: 12px 16px;
            font-weight: 700;
            border-bottom: 1px solid var(--surface-border);
        }

        td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--border-subtle);
            color: var(--text-secondary);
        }

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

        .sources-box {
            background: rgba(0, 0, 0, 0.3);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px;
            margin-top: 36px;
            font-size: 0.88rem;
            color: var(--text-muted);
        }

        .faq-box {
            background: var(--card-gradient);
            border: 1px solid var(--surface-border);
            border-radius: var(--radius-md);
            padding: 20px;
            margin-bottom: 14px;
        }

        .faq-q {
            font-weight: 700;
            font-size: 1.05rem;
            color: #fff;
            margin-bottom: 8px;
        }

        .badge-pill {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 12px;
            font-size: 0.82rem;
            font-weight: 600;
            text-decoration: none;
            transition: transform 0.15s, background-color 0.15s;
        }
        .badge-pill:hover { transform: translateY(-1px); }
        .badge-pill.green { background: rgba(16, 185, 129, 0.2); color: var(--emerald-light); }
        .badge-pill.red { background: rgba(239, 68, 68, 0.2); color: #f87171; }
        .badge-pill.gold { background: rgba(245, 158, 11, 0.2); color: var(--gold-light); }
        .badge-pill.indigo { background: rgba(47, 211, 154, 0.2); color: #7ee6c0; }

        .site-footer {
            border-top: 1px solid rgba(47, 211, 154, 0.14);
            padding: 48px 20px 40px 20px;
            font-size: 0.88rem;
            color: var(--text-muted);
            background: #06140e;
        }

        .footer-inner {
            max-width: 1120px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 32px;
        }

        .footer-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 24px;
        }

        .footer-col-title {
            color: #7ee6c0;
            font-weight: 700;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 12px;
        }

        .footer-link {
            color: var(--text-secondary);
            text-decoration: none;
            display: block;
            margin-bottom: 8px;
            font-size: 0.88rem;
            transition: color 0.15s;
        }

        .footer-link:hover {
            color: #fff;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            border-top: 1px solid var(--border-subtle);
            padding-top: 24px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .skip-link {
            position: absolute;
            top: -48px;
            left: 12px;
            z-index: 9999;
            background: var(--brand);
            color: #fff;
            padding: 10px 18px;
            border-radius: 0 0 8px 8px;
            font-weight: 700;
            text-decoration: none;
            transition: top 0.15s;
        }
        .skip-link:focus-visible { top: 0; }

        a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, [tabindex]:focus-visible {
            outline: 2px solid var(--brand-light);
            outline-offset: 2px;
        }

        @media (max-width: 640px) {
            .site-header { padding: 10px 14px; }
            .main-container { padding: 24px 14px 60px 14px; }
            .calculator-card { padding: 18px 14px; }
            .calc-grid { grid-template-columns: 1fr; gap: 14px; }
            .results-panel { padding: 18px 14px; }
            .kpi-row { grid-template-columns: 1fr 1fr; }
            .editorial-section { margin-top: 36px; }
        }

        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }
  

        /* FYFI UX hardening */
        .skip-link { position: absolute; top: -48px; left: 12px; z-index: 9999; background: var(--indigo); color: #fff; padding: 10px 18px; border-radius: 0 0 8px 8px; font-weight: 700; text-decoration: none; transition: top 0.15s; }
        .skip-link:focus-visible { top: 0; }
        a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--gold-light); outline-offset: 2px; }
        .calc-input:focus-visible, .gl-search:focus-visible { box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.35); }
        input[type="number"] { -moz-appearance: textfield; appearance: textfield; }
        input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
        @media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; } }

.mp-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:18px; }
.mp-card { background:var(--bg-card); border:1px solid var(--surface-border); border-radius:var(--radius-lg); padding:20px; display:flex; flex-direction:column; gap:12px; }
.mp-card-head { display:flex; justify-content:space-between; align-items:center; gap:10px; }
.mp-card-head h3 { margin:0; font-size:1.1rem; color:#fff; }
.mp-stats { display:grid; grid-template-columns:1fr 1fr; gap:10px; }
.mp-stats div { background:rgba(0,0,0,0.3); border-radius:var(--radius-sm); padding:8px 10px; display:flex; flex-direction:column; gap:2px; }
.mp-lbl { font-size:0.7rem; color:var(--text-muted); text-transform:uppercase; letter-spacing:0.04em; }
.mp-stats b { font-family:var(--mono); color:var(--gold-light); font-size:1.05rem; }
.mp-weight-row { display:grid; grid-template-columns:1fr 44px; gap:4px 8px; align-items:center; font-size:0.78rem; margin-bottom:6px; }
.mp-weight-label { color:var(--text-secondary); }
.mp-weight-val { text-align:right; font-family:var(--mono); color:#fff; }
.mp-weight-bar { grid-column:1 / -1; height:6px; background:rgba(255,255,255,0.08); border-radius:4px; overflow:hidden; }
.mp-weight-bar i { display:block; height:100%; background:linear-gradient(90deg,var(--indigo),var(--emerald)); }
.mp-best { font-size:0.82rem; color:var(--text-secondary); margin:0; }
.mp-vehicles { font-size:0.78rem; color:var(--text-muted); }
.mp-vehicles code { background:rgba(99,102,241,0.15); color:var(--indigo-light); padding:1px 6px; border-radius:4px; font-family:var(--mono); }
.blend-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:14px; margin:16px 0; }
.blend-val { font-family:var(--mono); color:var(--gold-light); font-weight:700; }
.mc-dist { display:flex; flex-direction:column; gap:8px; border-radius:var(--radius-sm); }
.mc-dist-row { display:flex; justify-content:space-between; background:rgba(255,255,255,0.03); padding:10px 14px; border-radius:8px; font-size:0.9rem; }
.mc-dist-row b { font-family:var(--mono); color:#fff; }
.tips-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(300px,1fr)); gap:14px; }
.tip-card { display:flex; gap:12px; background:var(--bg-card); border:1px solid var(--surface-border); border-radius:var(--radius-md); padding:16px; cursor:pointer; transition:border-color 0.2s; }
.tip-card:hover { border-color:var(--gold); }
.tip-card input { margin-top:4px; width:18px; height:18px; accent-color:var(--emerald); cursor:pointer; flex-shrink:0; }
.tip-body { display:flex; flex-direction:column; gap:6px; }
.tip-cat { font-size:0.72rem; text-transform:uppercase; letter-spacing:0.05em; color:var(--indigo-light); font-weight:700; }
.tip-body p { margin:0; font-size:0.88rem; color:var(--text-secondary); }
.tip-save { font-size:0.8rem; color:var(--text-muted); }
.tip-save b { color:var(--emerald-light); }
.editorial-list { margin:12px 0 20px 18px; padding:0; display:flex; flex-direction:column; gap:10px; }
.editorial-list li { color:var(--text-secondary); font-size:1rem; }