:root {
            --gf-navy: #111827;
            --gf-navy-soft: #1f2937;
            --gf-navy-border: #374151;
            --gf-green: #10B981;
            --gf-green-dark: #059669;
            --gf-orange: #FF9600;
            --gf-orange-dark: #92400E;
            --gf-blue: #3B82F6;
            --gf-blue-dark: #2563EB;
            --gf-yellow: #FBBF24;
            --gf-red: #EF4444;
            --gf-white: #FFFFFF;
            --gf-surface: #F9FAFB;
            --gf-border: #E5E7EB;
            --gf-muted: #6B7280;
            --gf-muted-light: #9CA3AF;
            --gf-font-display: "Space Grotesk", "Roboto", Arial, sans-serif;
            --gf-font-mono: "JetBrains Mono", monospace;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            color: var(--gf-navy);
            background: var(--gf-white);
            font-family: "Roboto", Arial, sans-serif;
            -webkit-font-smoothing: antialiased;
        }

        .gf-skip-link {
            position: fixed;
            top: 12px;
            left: 12px;
            z-index: 100;
            padding: 10px 14px;
            color: var(--gf-navy);
            background: var(--gf-white);
            border: 2px solid var(--gf-green);
            border-radius: 8px;
            font-weight: 800;
            text-decoration: none;
            transform: translateY(-160%);
        }

        .gf-skip-link:focus {
            transform: translateY(0);
        }

        .gf-site-header {
            position: relative;
            z-index: 50;
            color: var(--gf-white);
            background: var(--gf-navy);
        }

        .gf-site-header-inner {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            gap: 36px;
            width: min(100% - 56px, 1320px);
            min-height: 74px;
            align-items: center;
            margin: 0 auto;
        }

        .gf-brand {
            display: inline-flex;
            width: max-content;
            align-items: center;
        }

        .gf-brand img {
            display: block;
            width: auto;
            height: 34px;
        }

        .gf-site-nav {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 26px;
        }

        .gf-site-nav a,
        .gf-header-login {
            color: var(--gf-white);
            font-size: 0.92rem;
            font-weight: 700;
            text-decoration: none;
        }

        .gf-site-nav a:hover,
        .gf-header-login:hover {
            color: var(--gf-muted-light);
        }

        .gf-site-nav a[aria-current="page"] {
            color: var(--gf-green);
            text-decoration: underline;
            text-decoration-thickness: 2px;
            text-underline-offset: 7px;
        }

        .gf-site-nav a[aria-current="page"]:hover {
            color: var(--gf-green);
        }

        .gf-header-actions {
            display: flex;
            align-items: center;
            justify-content: flex-end;
            gap: 28px;
        }

        .gf-header-cta {
            display: inline-flex;
            min-height: 44px;
            align-items: center;
            justify-content: center;
            padding: 0 20px;
            color: var(--gf-navy);
            background: var(--gf-green);
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 800;
            text-decoration: none;
        }

        .gf-header-cta:hover {
            color: var(--gf-navy);
            background: var(--gf-green-dark);
        }

        .gf-mobile-nav {
            display: none;
            align-items: center;
            gap: 12px;
            justify-self: end;
        }

        .gf-mobile-header-cta {
            min-height: 40px;
            padding: 0 14px;
            font-size: 0.84rem;
        }

        .gf-mobile-menu-cta {
            display: flex;
            min-height: 50px;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-bottom: 10px;
            color: var(--gf-navy);
            background: var(--gf-green);
            border-radius: 14px;
            font-size: 1rem;
            font-weight: 800;
            text-decoration: none;
        }

        .gf-mobile-menu-cta:hover {
            color: var(--gf-navy);
            background: var(--gf-green-dark);
        }

        .gf-mobile-menu-cta:focus-visible {
            outline: 2px solid var(--gf-navy);
            outline-offset: 3px;
        }

        .gf-mobile-menu-link[aria-current="page"] .gf-mobile-menu-label {
            color: var(--gf-green-dark);
        }

        .gf-mobile-menu-link[aria-current="page"] .gf-mobile-menu-icon {
            color: var(--gf-green-dark);
            border-color: var(--gf-green);
        }

        .gf-mobile-menu-toggle {
            display: inline-flex;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            color: var(--gf-white);
            background: transparent;
            border: 0;
            border-radius: 8px;
            cursor: pointer;
        }

        .gf-mobile-menu-toggle:hover,
        .gf-mobile-menu-toggle:focus-visible,
        .gf-mobile-menu-toggle[aria-expanded="true"] {
            background: var(--gf-navy-soft);
        }

        .gf-mobile-menu-toggle:focus-visible,
        .gf-mobile-menu-close:focus-visible,
        .gf-mobile-menu-link:focus-visible,
        .gf-site-nav a:focus-visible,
        .gf-header-login:focus-visible,
        .gf-header-cta:focus-visible {
            outline: 2px solid var(--gf-green);
            outline-offset: 3px;
        }

        .gf-mobile-menu-toggle svg {
            width: 24px;
            height: 24px;
            fill: none;
            stroke: currentColor;
            stroke-width: 2;
            stroke-linecap: round;
        }

        .gf-mobile-backdrop {
            position: fixed;
            inset: 0;
            z-index: 1000;
            display: flex;
            align-items: flex-start;
            justify-content: flex-end;
            padding: calc(74px + env(safe-area-inset-top)) 16px calc(16px + env(safe-area-inset-bottom));
            background: rgba(0, 0, 0, 0.5);
        }

        .gf-mobile-backdrop[hidden] {
            display: none;
        }

        .gf-mobile-panel {
            position: relative;
            display: block;
            width: min(420px, calc(100vw - 32px));
            max-height: calc(100dvh - 90px);
            padding: 12px;
            overflow-y: auto;
            background: var(--gf-white);
            border: 1px solid var(--gf-border);
            border-radius: 22px;
            box-shadow: 0 4px 12px rgba(17, 24, 39, 0.3);
        }

        .gf-mobile-panel-header {
            display: flex;
            justify-content: flex-end;
            margin-bottom: 2px;
        }

        .gf-mobile-menu-close {
            position: relative;
            display: inline-flex;
            width: 36px;
            height: 36px;
            align-items: center;
            justify-content: center;
            color: var(--gf-navy);
            background: var(--gf-surface);
            border: 1px solid var(--gf-border);
            border-radius: 999px;
            cursor: pointer;
        }

        .gf-mobile-menu-close:hover {
            background: var(--gf-border);
        }

        .gf-mobile-menu-close::before,
        .gf-mobile-menu-close::after {
            position: absolute;
            width: 17px;
            height: 2px;
            content: "";
            background: var(--gf-navy);
            border-radius: 999px;
        }

        .gf-mobile-menu-close::before {
            transform: rotate(45deg);
        }

        .gf-mobile-menu-close::after {
            transform: rotate(-45deg);
        }

        .gf-mobile-menu-list,
        .gf-mobile-menu-account {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        .gf-mobile-menu-list li,
        .gf-mobile-menu-account li {
            margin: 0;
        }

        .gf-mobile-menu-link {
            display: flex;
            width: 100%;
            min-height: 48px;
            align-items: center;
            gap: 12px;
            padding: 6px 0;
            color: var(--gf-navy);
            border-bottom: 1px solid var(--gf-border);
            font-size: 1rem;
            font-weight: 800;
            text-decoration: none;
        }

        .gf-mobile-menu-link:hover {
            color: var(--gf-navy);
        }

        .gf-mobile-menu-icon {
            display: inline-flex;
            width: 36px;
            height: 36px;
            flex: 0 0 36px;
            align-items: center;
            justify-content: center;
            color: var(--gf-navy);
            background: var(--gf-surface);
            border: 1px solid var(--gf-border);
            border-radius: 10px;
        }

        .gf-mobile-menu-link:hover .gf-mobile-menu-icon {
            color: var(--gf-white);
            background: var(--gf-navy-soft);
            border-color: var(--gf-navy-soft);
        }

        .gf-mobile-menu-icon svg {
            width: 20px;
            height: 20px;
            fill: none;
            stroke: currentColor;
            stroke-linecap: round;
            stroke-linejoin: round;
            stroke-width: 1.8;
        }

        .gf-mobile-menu-label {
            flex: 1;
        }

        .gf-mobile-menu-new {
            flex: 0 0 auto;
            margin-left: auto;
            padding: 0.3em 0.65em;
            color: var(--gf-navy);
            background: var(--gf-green);
            border-radius: 999px;
            font-size: 0.65rem;
            font-weight: 900;
            line-height: 1;
        }

        .gf-mobile-menu-account {
            margin-top: 8px;
            padding-top: 8px;
            border-top: 1px solid var(--gf-border);
        }

        .gf-mobile-menu-list > li:last-child .gf-mobile-menu-link,
        .gf-mobile-menu-account > li:last-child .gf-mobile-menu-link {
            border-bottom: 0;
        }

        .gf-mobile-menu-action {
            min-height: 48px;
            margin-top: 8px;
            padding: 10px 16px;
            color: var(--gf-white);
            background: var(--gf-navy);
            border: 0;
            border-radius: 14px;
        }

        .gf-mobile-menu-action:hover {
            color: var(--gf-white);
            background: var(--gf-navy-soft);
        }

        .gf-mobile-menu-action .gf-mobile-menu-icon,
        .gf-mobile-menu-action:hover .gf-mobile-menu-icon {
            width: 32px;
            height: 32px;
            flex-basis: 32px;
            color: var(--gf-green);
            background: transparent;
            border: 0;
        }

        .gf-mobile-menu-arrow {
            color: var(--gf-green);
            font-size: 1.5rem;
            line-height: 1;
        }

        .gf-site-header *,
        .gf-site-header *::before,
        .gf-site-header *::after,
        .gf-page *,
        .gf-page *::before,
        .gf-page *::after,
        .gf-footer *,
        .gf-footer *::before,
        .gf-footer *::after {
            box-sizing: border-box;
        }

        .gf-page a {
            color: inherit;
        }

        .gf-shell {
            width: min(1280px, calc(100% - 96px));
            margin: 0 auto;
        }

        .gf-kicker {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            margin: 0 0 20px;
            color: var(--gf-green-dark);
            font-family: var(--gf-font-mono);
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.14em;
            text-transform: uppercase;
        }

        .gf-kicker::before {
            width: 9px;
            height: 9px;
            border-radius: 3px;
            background: var(--gf-green);
            content: "";
        }

        .gf-button {
            display: inline-flex;
            min-height: 52px;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 0 24px;
            border: 1px solid transparent;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 800;
            line-height: 1;
            text-decoration: none;
            transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
        }

        .gf-button:hover {
            transform: translateY(-2px);
        }

        .gf-button:focus-visible,
        .gf-text-link:focus-visible {
            outline: 3px solid var(--gf-blue);
            outline-offset: 3px;
        }

        .gf-page .gf-button-primary {
            color: var(--gf-navy);
            background: var(--gf-green);
            box-shadow: 0 8px 20px rgba(16, 185, 129, 0.2);
        }

        .gf-page .gf-button-primary:hover {
            color: var(--gf-navy);
            background: var(--gf-green-dark);
            box-shadow: 0 12px 24px rgba(16, 185, 129, 0.24);
        }

        .gf-button-light {
            color: var(--gf-navy);
            padding-right: 10px;
            padding-left: 10px;
            background: transparent;
            border-color: transparent;
        }

        .gf-button-light:hover {
            color: var(--gf-navy);
            border-color: transparent;
            background: transparent;
        }

        /* Hero */
        .gf-hero {
            padding: 48px 0 56px;
            overflow: hidden;
            background: var(--gf-white);
            border-bottom: 1px solid var(--gf-border);
        }

        .gf-hero-grid {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 560px;
            gap: 72px;
            align-items: center;
        }

        .gf-hero-copy h1 {
            max-width: 680px;
            margin: 0;
            color: var(--gf-navy);
            font-family: var(--gf-font-display);
            font-size: clamp(2.9rem, 4.6vw, 4.1rem);
            font-weight: 700;
            letter-spacing: -0.035em;
            line-height: 1.03;
            text-wrap: balance;
        }

        .gf-hero-copy h1 span {
            display: block;
        }

        .gf-hero-copy > p {
            max-width: 570px;
            margin: 26px 0 0;
            color: var(--gf-muted);
            font-size: 1.18rem;
            line-height: 1.65;
            text-wrap: pretty;
        }

        .gf-hero-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-top: 32px;
        }

        .gf-play {
            width: 30px;
            height: 30px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--gf-navy);
            border-radius: 999px;
        }

        .gf-play svg {
            width: 14px;
            height: 14px;
            fill: none;
            stroke: var(--gf-navy);
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .gf-hero-note {
            display: block;
            margin-top: 14px;
            color: var(--gf-muted);
            font-size: 0.84rem;
        }

        .gf-proof {
            display: grid;
            grid-template-columns: repeat(3, max-content);
            justify-content: space-between;
            margin: 42px 0 0;
            padding: 0;
            list-style: none;
        }

        .gf-proof li {
            display: grid;
            grid-template-columns: 38px 1fr;
            gap: 10px;
            align-items: center;
            min-width: 0;
            padding-right: 16px;
        }

        .gf-proof li + li {
            padding-left: 18px;
            border-left: 1px solid var(--gf-border);
        }

        .gf-proof-icon {
            display: inline-flex;
            width: 36px;
            height: 36px;
            align-items: center;
            justify-content: center;
            color: var(--gf-green-dark);
            border: 1px solid var(--gf-green);
            border-radius: 999px;
        }

        .gf-proof-icon svg {
            display: block;
            width: 18px;
            height: 18px;
            fill: none;
            stroke: currentColor;
            stroke-width: 1.8;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .gf-proof-copy strong,
        .gf-proof-copy span {
            display: block;
        }

        .gf-proof-copy strong {
            color: var(--gf-navy);
            font-size: 0.94rem;
            line-height: 1.2;
        }

        .gf-proof-copy span {
            margin-top: 3px;
            color: var(--gf-muted);
            font-size: 0.78rem;
            line-height: 1.2;
        }

        /* Hero learning track */
        .gf-map {
            overflow: hidden;
            background: var(--gf-white);
            border: 1px solid var(--gf-border);
            border-radius: 24px;
            box-shadow: 0 20px 48px rgba(17, 24, 39, 0.1);
        }

        .gf-map-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            min-height: 78px;
            align-items: center;
            border-bottom: 1px solid var(--gf-border);
        }

        .gf-map-stat {
            display: grid;
            grid-template-columns: 28px 1fr;
            gap: 9px;
            align-items: center;
            padding: 0 19px;
        }

        .gf-map-stat + .gf-map-stat {
            border-left: 1px solid var(--gf-border);
        }

        .gf-map-stat svg {
            width: 26px;
            height: 26px;
        }

        .gf-map-stat strong,
        .gf-map-stat span {
            display: block;
        }

        .gf-map-stat strong {
            font-family: var(--gf-font-mono);
            font-size: 0.84rem;
            font-weight: 700;
            line-height: 1.1;
        }

        .gf-map-stat span {
            margin-top: 3px;
            color: var(--gf-muted);
            font-size: 0.72rem;
        }

        .gf-map-stat .gf-map-stat-value-inline {
            display: flex;
            align-items: baseline;
            gap: 5px;
            white-space: nowrap;
        }

        .gf-map-stat .gf-map-stat-value-inline > span {
            margin-top: 0;
        }

        .gf-track {
            margin: 0;
            padding: 22px 20px 24px;
            list-style: none;
        }

        .gf-track-step {
            position: relative;
            display: grid;
            grid-template-columns: 66px minmax(0, 1fr) auto;
            gap: 16px;
            align-items: center;
            padding: 12px 14px;
            border: 1px solid transparent;
            border-radius: 18px;
        }

        .gf-track-step + .gf-track-step {
            margin-top: 14px;
        }

        .gf-track-step + .gf-track-step::before {
            position: absolute;
            top: -28px;
            left: calc(14px + 33px - 3px);
            z-index: 1;
            width: 6px;
            height: 56px;
            content: "";
            background: var(--gf-border);
            border-radius: 999px;
        }

        .gf-track-step.is-complete + .gf-track-step::before {
            background: var(--gf-green);
        }

        .gf-track-step.is-current {
            background: var(--gf-surface);
            border-color: var(--gf-border);
        }

        .gf-node-dot {
            position: relative;
            z-index: 2;
            display: inline-flex;
            width: 66px;
            height: 66px;
            align-items: center;
            justify-content: center;
            color: var(--gf-muted);
            background: var(--gf-surface);
            border: 2px solid var(--gf-border);
            border-radius: 999px;
            font-size: 1.28rem;
            font-weight: 900;
            box-shadow: 0 4px 0 var(--gf-border);
        }

        .gf-track-step.is-complete .gf-node-dot {
            color: var(--gf-navy);
            background: var(--gf-green);
            border-color: var(--gf-green-dark);
            box-shadow: 0 4px 0 var(--gf-green-dark);
        }

        .gf-track-step.is-current .gf-node-dot {
            color: var(--gf-navy);
            background: var(--gf-yellow);
            border-color: var(--gf-orange);
            box-shadow: 0 4px 0 var(--gf-orange);
        }

        .gf-track-copy strong,
        .gf-track-copy span {
            display: block;
        }

        .gf-track-copy strong {
            color: var(--gf-navy);
            font-family: var(--gf-font-display);
            font-size: 1.04rem;
            font-weight: 700;
        }

        .gf-track-copy > span {
            margin-top: 4px;
            color: var(--gf-muted);
            font-size: 0.8rem;
        }

        .gf-track-step.is-complete .gf-track-copy > span {
            color: var(--gf-green-dark);
            font-weight: 700;
        }

        .gf-track-step.is-current .gf-track-copy > span {
            color: var(--gf-orange-dark);
            font-weight: 700;
        }

        .gf-track-xp {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 6px 9px;
            color: var(--gf-navy);
            background: var(--gf-yellow);
            border-radius: 7px;
            font-family: var(--gf-font-mono);
            font-size: 0.72rem;
            font-weight: 700;
            white-space: nowrap;
        }

        .gf-track-gopher {
            z-index: 2;
            justify-self: end;
            width: 76px;
            height: auto;
            margin: -16px 2px -6px 0;
            filter: drop-shadow(0 10px 10px rgba(17, 24, 39, 0.14));
            pointer-events: none;
        }

        .gf-node-lock {
            display: inline-flex;
            width: 15px;
            height: 15px;
            align-items: center;
            justify-content: center;
        }

        .gf-track-copy .gf-node-status-locked {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .gf-node-lock svg {
            width: 100%;
            height: 100%;
            fill: none;
            stroke: var(--gf-muted);
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        /* Curriculum path */
        .gf-curriculum {
            padding: 76px 0 72px;
            background: var(--gf-surface);
            border-bottom: 1px solid var(--gf-border);
        }

        .gf-section-heading {
            max-width: 900px;
            margin: 0 auto;
            text-align: center;
        }

        .gf-section-heading .gf-kicker {
            margin-bottom: 16px;
        }

        .gf-section-heading h2 {
            margin: 0;
            color: var(--gf-navy);
            font-family: var(--gf-font-display);
            font-size: clamp(2.1rem, 3.5vw, 2.7rem);
            font-weight: 700;
            letter-spacing: -0.03em;
            line-height: 1.08;
            text-wrap: balance;
        }

        .gf-section-heading p {
            margin: 18px auto 0;
            color: var(--gf-muted);
            font-size: 1.06rem;
            line-height: 1.6;
        }

        .gf-milestones {
            position: relative;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 26px;
            margin-top: 64px;
        }

        .gf-milestones::before {
            position: absolute;
            top: 36px;
            right: 12.5%;
            left: 12.5%;
            height: 4px;
            background: linear-gradient(to right, var(--gf-green) 0 33.4%, var(--gf-border) 33.4%);
            border-radius: 999px;
            content: "";
        }

        .gf-milestone {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .gf-milestone-node {
            position: relative;
            z-index: 1;
            display: inline-flex;
            width: 76px;
            height: 76px;
            margin: 0 0 20px;
            align-items: center;
            justify-content: center;
            color: var(--gf-muted);
            background: var(--gf-white);
            border: 2px solid var(--gf-border);
            border-radius: 999px;
            font-size: 1.35rem;
            font-weight: 900;
            box-shadow: 0 4px 0 var(--gf-border);
        }

        .gf-milestone-node::after {
            position: absolute;
            top: calc(100% + 5px);
            left: 50%;
            width: 4px;
            height: 14px;
            content: "";
            background: var(--gf-border);
            border-radius: 999px;
            transform: translateX(-50%);
        }

        .gf-milestone.is-complete .gf-milestone-node::after {
            background: var(--gf-green);
        }

        .gf-milestone.is-current .gf-milestone-node::after {
            background: var(--gf-orange);
        }

        .gf-milestone.is-complete .gf-milestone-node {
            color: var(--gf-navy);
            background: var(--gf-green);
            border-color: var(--gf-green-dark);
            box-shadow: 0 4px 0 var(--gf-green-dark);
        }

        .gf-milestone.is-current .gf-milestone-node {
            color: var(--gf-navy);
            background: var(--gf-yellow);
            border-color: var(--gf-orange);
            outline: 6px solid var(--gf-surface);
            box-shadow: 0 4px 0 var(--gf-orange);
        }

        .gf-milestone-card {
            position: relative;
            display: flex;
            width: 100%;
            flex: 1;
            flex-direction: column;
            padding: 24px 24px 66px;
            background: var(--gf-white);
            border: 1px solid var(--gf-border);
            border-radius: 16px;
            box-shadow: 0 8px 20px rgba(17, 24, 39, 0.05);
            transition: transform 180ms ease, box-shadow 180ms ease;
        }

        .gf-milestone-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px rgba(17, 24, 39, 0.09);
        }

        .gf-milestone h3 {
            margin: 0;
            color: var(--gf-navy);
            font-family: var(--gf-font-display);
            font-size: 1.16rem;
            font-weight: 700;
        }

        .gf-milestone p {
            margin: 12px 0 0;
            color: var(--gf-muted);
            font-size: 0.9rem;
            line-height: 1.55;
        }

        .gf-milestone-state {
            position: absolute;
            right: 0;
            bottom: 0;
            left: 0;
            padding: 15px 8px;
            color: var(--gf-muted);
            background: var(--gf-surface);
            border-top: 1px solid var(--gf-border);
            border-radius: 0 0 16px 16px;
            font-size: 0.78rem;
            font-weight: 800;
        }

        .gf-milestone.is-complete .gf-milestone-state {
            color: var(--gf-green-dark);
        }

        .gf-milestone.is-current .gf-milestone-state {
            color: var(--gf-orange-dark);
        }

        .gf-units {
            margin-top: 54px;
            text-align: center;
        }

        .gf-units-caption {
            margin: 0 0 18px;
            color: var(--gf-green-dark);
            font-family: var(--gf-font-mono);
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.14em;
            text-transform: uppercase;
        }

        .gf-unit-chips {
            display: flex;
            max-width: 880px;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin: 0 auto;
            padding: 0;
            list-style: none;
        }

        .gf-unit-chips li {
            padding: 9px 16px;
            color: var(--gf-navy);
            background: var(--gf-white);
            border: 1px solid var(--gf-border);
            border-radius: 999px;
            font-size: 0.88rem;
            font-weight: 700;
            box-shadow: 0 2px 6px rgba(17, 24, 39, 0.04);
        }

        .gf-units-note {
            margin: 18px 0 0;
            color: var(--gf-muted);
            font-size: 0.86rem;
        }

        /* Practice */
        .gf-practice {
            padding: 76px 0 80px;
            background: var(--gf-surface);
            border-top: 1px solid var(--gf-border);
            border-bottom: 1px solid var(--gf-border);
        }

        #practice {
            scroll-margin-top: 24px;
        }

        .gf-practice-grid {
            display: grid;
            grid-template-columns: minmax(300px, 0.68fr) minmax(550px, 1.32fr);
            gap: 64px;
            align-items: center;
        }

        .gf-practice-copy h2 {
            max-width: 470px;
            margin: 0;
            font-family: var(--gf-font-display);
            font-size: clamp(2.1rem, 3.5vw, 2.7rem);
            font-weight: 700;
            letter-spacing: -0.03em;
            line-height: 1.08;
            text-wrap: balance;
        }

        .gf-practice-copy > p {
            max-width: 470px;
            margin: 22px 0 0;
            color: var(--gf-muted);
            font-size: 1.06rem;
            line-height: 1.65;
        }

        .gf-checklist {
            display: grid;
            gap: 15px;
            margin: 30px 0 0;
            padding: 0;
            list-style: none;
        }

        .gf-checklist li {
            display: flex;
            align-items: center;
            gap: 12px;
            color: var(--gf-navy);
            font-weight: 700;
        }

        .gf-check {
            display: inline-flex;
            flex: 0 0 24px;
            width: 24px;
            height: 24px;
            align-items: center;
            justify-content: center;
            color: var(--gf-white);
            background: var(--gf-green);
            border-radius: 999px;
        }

        .gf-check svg {
            width: 14px;
            height: 14px;
            fill: none;
            stroke: currentColor;
            stroke-width: 2.5;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .gf-exercise {
            overflow: hidden;
            color: var(--gf-white);
            background: var(--gf-navy);
            border: 1px solid var(--gf-navy-border);
            border-radius: 18px;
            box-shadow: 0 24px 54px rgba(17, 24, 39, 0.2);
        }

        .gf-exercise-header {
            display: grid;
            grid-template-columns: auto 1fr auto;
            gap: 18px;
            align-items: center;
            padding: 15px 20px;
            border-bottom: 1px solid var(--gf-navy-border);
        }

        .gf-exercise-header strong {
            font-size: 0.82rem;
        }

        .gf-exercise-progress {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 5px;
        }

        .gf-exercise-progress span {
            height: 6px;
            background: var(--gf-navy-border);
            border-radius: 999px;
        }

        .gf-exercise-progress span:nth-child(-n+2) {
            background: var(--gf-green);
        }

        .gf-exercise-meta {
            display: flex;
            gap: 12px;
            align-items: center;
            color: var(--gf-muted-light);
            font-size: 0.78rem;
            font-weight: 700;
        }

        .gf-xp {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 5px 8px;
            color: var(--gf-navy);
            background: var(--gf-yellow);
            border-radius: 6px;
            font-family: var(--gf-font-mono);
            font-size: 0.72rem;
            font-weight: 700;
        }

        .gf-exercise-body {
            padding: 20px;
        }

        .gf-exercise-label {
            margin: 0 0 14px;
            color: var(--gf-muted-light);
            font-family: var(--gf-font-mono);
            font-size: 0.74rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
        }

        .gf-code {
            margin: 0;
            padding: 16px 20px;
            overflow-x: auto;
            color: var(--gf-border);
            background: var(--gf-navy-soft);
            border: 1px solid var(--gf-navy-border);
            border-radius: 12px;
            font: 500 0.86rem/1.65 "JetBrains Mono", monospace;
        }

        .gf-code .kw { color: var(--gf-blue); }
        .gf-code .str { color: var(--gf-yellow); }
        .gf-code .blank { color: var(--gf-white); border-bottom: 2px solid var(--gf-green); }

        .gf-answer-label {
            display: block;
            margin: 16px 0 8px;
            color: var(--gf-muted-light);
            font-size: 0.78rem;
            font-weight: 700;
        }

        .gf-answer-shell {
            position: relative;
            width: min(230px, 100%);
        }

        .gf-answer {
            display: block;
            width: 100%;
            padding: 10px 42px 10px 13px;
            color: var(--gf-white);
            background: var(--gf-navy-soft);
            border: 1px solid var(--gf-green);
            border-radius: 8px;
            font: 500 0.84rem "JetBrains Mono", monospace;
        }

        .gf-answer::placeholder {
            color: var(--gf-muted);
        }

        .gf-answer:focus-visible {
            outline: 2px solid var(--gf-green);
            outline-offset: 3px;
        }

        .gf-answer-indicator {
            position: absolute;
            top: 50%;
            right: 13px;
            display: none;
            width: 16px;
            height: 16px;
            transform: translateY(-50%);
            fill: none;
            stroke: var(--gf-green);
            stroke-width: 2.4;
            stroke-linecap: round;
            stroke-linejoin: round;
            pointer-events: none;
        }

        .gf-answer-shell.is-correct .gf-answer-indicator {
            display: block;
        }

        .gf-submit {
            width: 100%;
            min-height: 44px;
            margin-top: 16px;
            color: var(--gf-navy);
            background: var(--gf-green);
            border: none;
            border-radius: 9px;
            cursor: pointer;
            font: 800 0.9rem "Roboto", sans-serif;
        }

        .gf-submit:hover {
            background: var(--gf-green-dark);
        }

        .gf-submit:focus-visible {
            outline: 2px solid var(--gf-white);
            outline-offset: 3px;
        }

        .gf-feedback {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin: 10px 0 0;
            color: var(--gf-muted-light);
            font-size: 0.78rem;
            text-align: center;
        }

        .gf-feedback[hidden] {
            display: none;
        }

        .gf-feedback.is-error {
            color: var(--gf-yellow);
        }

        .gf-feedback .gf-check {
            width: 18px;
            height: 18px;
            flex-basis: 18px;
        }

        /* Gamification features */
        .gf-features {
            padding: 76px 0 84px;
            background: var(--gf-white);
        }

        .gf-feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 54px;
        }

        @media (max-width: 960px) {
            .gf-feature-grid {
                max-width: 560px;
                grid-template-columns: 1fr;
                margin-right: auto;
                margin-left: auto;
            }
        }

        .gf-feature {
            padding: 28px 26px 30px;
            background: var(--gf-white);
            border: 1px solid var(--gf-border);
            border-radius: 16px;
            box-shadow: 0 8px 20px rgba(17, 24, 39, 0.05);
            transition: transform 180ms ease, box-shadow 180ms ease;
        }

        .gf-feature:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px rgba(17, 24, 39, 0.09);
        }

        .gf-feature-icon {
            display: inline-flex;
            width: 52px;
            height: 52px;
            margin-bottom: 18px;
            align-items: center;
            justify-content: center;
            border-radius: 14px;
        }

        .gf-feature-icon svg {
            width: 30px;
            height: 30px;
        }

        .gf-feature-icon-flame { background: #FFF7ED; }
        .gf-feature-icon-star { background: #FEF9C3; }
        .gf-feature-icon-heart { background: #FEE2E2; }

        .gf-feature h3 {
            margin: 0;
            color: var(--gf-navy);
            font-family: var(--gf-font-display);
            font-size: 1.18rem;
            font-weight: 700;
        }

        .gf-feature p {
            margin: 10px 0 0;
            color: var(--gf-muted);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* FAQ */
        .gf-faq {
            padding: 76px 0 84px;
            background: var(--gf-white);
        }

        .gf-faq-list {
            max-width: 720px;
            margin: 44px auto 0;
        }

        .gf-faq-item {
            background: var(--gf-white);
            border: 1px solid var(--gf-border);
            border-radius: 14px;
        }

        .gf-faq-item + .gf-faq-item {
            margin-top: 12px;
        }

        .gf-faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            color: var(--gf-navy);
            cursor: pointer;
            font-size: 1.02rem;
            font-weight: 700;
            list-style: none;
        }

        .gf-faq-item summary::-webkit-details-marker {
            display: none;
        }

        .gf-faq-item summary::after {
            flex: 0 0 auto;
            color: var(--gf-green-dark);
            content: "+";
            font-size: 1.4rem;
            font-weight: 700;
            line-height: 1;
            transition: transform 160ms ease;
        }

        .gf-faq-item[open] summary::after {
            transform: rotate(45deg);
        }

        .gf-faq-item summary:hover {
            color: var(--gf-green-dark);
        }

        .gf-faq-item summary:focus-visible {
            outline: 3px solid var(--gf-blue);
            outline-offset: -3px;
            border-radius: 14px;
        }

        .gf-faq-item p {
            margin: 0;
            padding: 0 20px 18px;
            color: var(--gf-muted);
            line-height: 1.65;
        }

        /* Closing CTA */
        .gf-cta {
            padding: 84px 0 80px;
            color: var(--gf-white);
            background: var(--gf-navy);
            text-align: center;
        }

        .gf-cta-inner {
            max-width: 720px;
        }

        .gf-cta-gopher {
            width: 92px;
            height: auto;
            margin-bottom: 22px;
            filter: drop-shadow(0 12px 14px rgba(0, 0, 0, 0.35));
        }

        .gf-cta h2 {
            margin: 0;
            font-family: var(--gf-font-display);
            font-size: clamp(2.3rem, 4vw, 3.1rem);
            font-weight: 700;
            letter-spacing: -0.03em;
            line-height: 1.06;
            text-wrap: balance;
        }

        .gf-cta-sub {
            max-width: 520px;
            margin: 18px auto 0;
            color: var(--gf-muted-light);
            font-size: 1.06rem;
            line-height: 1.6;
            text-wrap: balance;
        }

        .gf-cta-actions {
            display: flex;
            justify-content: center;
            margin-top: 30px;
        }

        .gf-cta-note {
            display: block;
            margin-top: 14px;
            color: var(--gf-muted-light);
            font-size: 0.84rem;
        }

        .gf-cta-trust {
            display: flex;
            max-width: 600px;
            align-items: center;
            gap: 16px;
            justify-content: center;
            margin: 46px auto 0;
            padding-top: 26px;
            border-top: 1px solid var(--gf-navy-border);
            color: var(--gf-muted-light);
            font-size: 0.92rem;
            line-height: 1.65;
            text-align: left;
        }

        .gf-cta-trust p {
            margin: 0;
        }

        .gf-cta-avatar {
            width: 52px;
            height: 52px;
            flex: 0 0 52px;
            object-fit: cover;
            border: 2px solid var(--gf-navy-border);
            border-radius: 999px;
        }

        .gf-cta-trust a {
            color: var(--gf-white);
            font-weight: 700;
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .gf-cta-trust a:focus-visible,
        .gf-cta .gf-button:focus-visible {
            outline: 3px solid var(--gf-green);
            outline-offset: 3px;
        }

        /* Footer */
        .gf-footer {
            padding: 36px 0 30px;
            color: var(--gf-muted-light);
            background: var(--gf-navy);
            border-top: 1px solid var(--gf-navy-border);
            font-size: 0.86rem;
        }

        .gf-footer-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }

        .gf-footer-top .gf-brand img {
            height: 30px;
        }

        .gf-footer-nav,
        .gf-footer-legal {
            display: flex;
            width: auto;
            flex: 0 0 auto;
            gap: 22px;
            justify-content: flex-end;
            padding: 0;
            background: transparent;
        }

        .gf-footer-nav a {
            color: var(--gf-white);
            font-size: 0.88rem;
            font-weight: 700;
            text-decoration: none;
        }

        .gf-footer-legal a {
            color: var(--gf-muted-light);
            font-weight: 700;
            text-decoration: none;
        }

        .gf-footer-nav a:hover,
        .gf-footer-legal a:hover {
            color: var(--gf-green);
        }

        .gf-footer a:focus-visible {
            outline: 2px solid var(--gf-green);
            outline-offset: 3px;
        }

        .gf-footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            margin-top: 24px;
            padding-top: 20px;
            border-top: 1px solid var(--gf-navy-border);
        }

        .gf-footer-bottom p {
            margin: 0;
        }

        @media (max-width: 1050px) {
            .gf-site-header-inner {
                grid-template-columns: 1fr auto;
            }

            .gf-site-nav,
            .gf-header-actions {
                display: none;
            }

            .gf-mobile-nav {
                display: flex;
            }

            .gf-hero-grid,
            .gf-practice-grid {
                grid-template-columns: 1fr;
            }

            .gf-hero-grid {
                gap: 54px;
            }

            .gf-hero-copy {
                max-width: 760px;
                text-align: center;
                margin: 0 auto;
            }

            .gf-hero-copy > p {
                margin-right: auto;
                margin-left: auto;
            }

            .gf-hero-actions {
                justify-content: center;
            }

            .gf-proof {
                max-width: 650px;
                margin-right: auto;
                margin-left: auto;
                text-align: left;
            }

            .gf-map {
                width: min(560px, 100%);
                margin: 0 auto;
            }

            .gf-milestones {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
                margin-top: 56px;
            }

            .gf-milestones::before {
                display: none;
            }

            .gf-milestone {
                display: grid;
                grid-template-columns: 56px 1fr;
                gap: 16px;
                align-items: start;
                text-align: left;
            }

            .gf-milestone-node {
                width: 56px;
                height: 56px;
                margin: 0;
                font-size: 1rem;
            }

            .gf-milestone-node::after {
                display: none;
            }

            .gf-milestone-card {
                padding: 20px 20px 58px;
            }

            .gf-practice-grid {
                gap: 52px;
            }

            .gf-practice-copy {
                max-width: 680px;
                text-align: center;
                margin: 0 auto;
            }

            .gf-practice-copy > p {
                margin-right: auto;
                margin-left: auto;
            }

            .gf-checklist {
                width: max-content;
                max-width: 100%;
                margin-right: auto;
                margin-left: auto;
                text-align: left;
            }

            .gf-exercise {
                width: min(720px, 100%);
                margin: 0 auto;
            }
        }

        @media (min-width: 701px) and (max-width: 1050px) {
            .gf-shell {
                width: calc(100% - 48px);
            }

            .gf-hero-copy h1 {
                font-size: clamp(2.4rem, 5vw, 3rem);
            }
        }

        @media (min-width: 1051px) and (max-width: 1239px) {
            .gf-hero-grid {
                grid-template-columns: 1fr;
                gap: 54px;
            }

            .gf-hero-copy {
                max-width: 760px;
                margin: 0 auto;
                text-align: center;
            }

            .gf-hero-copy > p {
                margin-right: auto;
                margin-left: auto;
            }

            .gf-hero-actions {
                justify-content: center;
            }

            .gf-proof {
                max-width: 650px;
                margin-right: auto;
                margin-left: auto;
                text-align: left;
            }

            .gf-map {
                width: min(560px, 100%);
                margin: 0 auto;
            }
        }

        @media (min-width: 961px) and (max-width: 1050px) {
            .gf-practice-copy {
                max-width: none;
                margin: 0;
                text-align: left;
            }

            .gf-practice-copy > p {
                margin-right: 0;
                margin-left: 0;
            }

            .gf-practice-grid {
                grid-template-columns: minmax(260px, 0.68fr) minmax(500px, 1.32fr);
                gap: 40px;
            }

            .gf-checklist {
                margin-right: 0;
                margin-left: 0;
            }

            .gf-exercise {
                width: auto;
                margin: 0;
            }
        }

        @media (max-width: 700px) {
            html {
                scroll-behavior: auto;
            }

            .gf-shell {
                width: min(100% - 32px, 1180px);
            }

            .gf-site-header-inner {
                width: calc(100% - 32px);
            }

            .gf-brand img {
                height: 32px;
            }

            .gf-hero {
                padding: 54px 0 62px;
            }

            .gf-hero-copy h1 {
                font-size: clamp(2.3rem, 10.5vw, 3rem);
                line-height: 1.04;
            }

            .gf-hero-copy > p {
                margin-top: 22px;
                font-size: 1.04rem;
            }

            .gf-hero-actions {
                flex-direction: column;
                align-items: stretch;
            }

            .gf-button {
                width: 100%;
            }

            .gf-hero-note {
                text-align: center;
            }

            .gf-proof {
                grid-template-columns: 1fr;
                gap: 16px;
                width: max-content;
                max-width: 100%;
                margin-top: 34px;
            }

            .gf-proof li,
            .gf-proof li + li {
                padding: 0;
                border: none;
            }
        }

        @media (max-width: 650px) {
            .gf-map {
                border-radius: 18px;
            }

            .gf-map-stats {
                min-height: 70px;
            }

            .gf-map-stat {
                grid-template-columns: 22px 1fr;
                gap: 6px;
                padding: 0 10px;
            }

            .gf-map-stat svg {
                width: 21px;
                height: 21px;
            }

            .gf-map-stat strong {
                font-size: 0.72rem;
            }

            .gf-map-stat span {
                font-size: 0.64rem;
            }

            .gf-track {
                padding: 18px 14px 20px;
            }

            .gf-track-step {
                grid-template-columns: 54px minmax(0, 1fr) auto;
                gap: 12px;
                padding: 10px 12px;
            }

            .gf-track-step + .gf-track-step::before {
                top: -26px;
                left: calc(12px + 27px - 3px);
                height: 52px;
            }

            .gf-node-dot {
                width: 54px;
                height: 54px;
                font-size: 1.05rem;
            }

            .gf-track-copy strong {
                font-size: 0.92rem;
            }

            .gf-track-copy > span {
                font-size: 0.72rem;
            }

            .gf-track-xp {
                padding: 5px 7px;
                font-size: 0.66rem;
            }

            .gf-track-gopher {
                width: 62px;
                margin: -12px 0 -4px;
            }
        }

        @media (max-width: 700px) {
            .gf-curriculum,
            .gf-practice,
            .gf-features {
                padding: 72px 0;
            }

            .gf-milestones {
                grid-template-columns: 1fr;
                gap: 20px;
                margin-top: 44px;
            }

            .gf-practice-grid {
                grid-template-columns: minmax(0, 1fr);
            }

            .gf-exercise-header {
                grid-template-columns: 1fr auto;
            }

            .gf-exercise-progress {
                grid-column: 1 / -1;
                grid-row: 2;
            }

            .gf-exercise-body {
                padding: 18px;
            }

            .gf-code {
                padding: 18px 16px;
                font-size: 0.76rem;
            }

            .gf-cta {
                padding: 72px 0 68px;
            }

            .gf-footer-top,
            .gf-footer-bottom {
                align-items: flex-start;
                flex-direction: column;
                gap: 14px;
            }

            .gf-footer-nav {
                flex-wrap: wrap;
                gap: 16px;
            }
        }

        @media (prefers-reduced-motion: no-preference) {
            .gf-track-step {
                animation: gf-rise 460ms cubic-bezier(0.2, 0.7, 0.3, 1) both;
            }

            .gf-track-step:nth-child(1) { animation-delay: 60ms; }
            .gf-track-step:nth-child(2) { animation-delay: 160ms; }
            .gf-track-step:nth-child(3) { animation-delay: 260ms; }
            .gf-track-step:nth-child(4) { animation-delay: 360ms; }

            .gf-track-gopher,
            .gf-cta-gopher {
                animation: gf-bob 3.4s ease-in-out infinite;
            }

            .gf-answer-shell.is-correct {
                animation: gf-correct-pop 380ms ease-out;
            }
        }

        @keyframes gf-rise {
            from {
                opacity: 0;
                transform: translateY(10px);
            }

            to {
                opacity: 1;
                transform: none;
            }
        }

        @keyframes gf-bob {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-7px); }
        }

        @keyframes gf-correct-pop {
            0% { transform: scale(1); }
            45% { transform: scale(1.04); }
            100% { transform: scale(1); }
        }

        @media (prefers-reduced-motion: reduce) {
            html {
                scroll-behavior: auto;
            }

            .gf-button,
            .gf-milestone-card,
            .gf-feature {
                transition: none;
            }
        }