:root {
                --navy: #05152b;
                --navy-light: #0c1f3a;
                --blue: #0d8fdb;
                --blue-glow: #4db8ff;
                --green: #2ecc71;
                --green-glow: #5ee397;
                --ink: #0a1628;
                --muted: #7a8ba3;
                --soft: #f0f4f8;
                --line: #e1e8f0;
                --radius: 20px;
                --radius-lg: 28px;
                --shadow: 0 8px 40px rgba(5, 21, 43, 0.1);
                --shadow-lg: 0 24px 80px rgba(5, 21, 43, 0.14);
                --max: 1200px;
                --sans: Inter, system-ui, sans-serif;
                --display: "Space Grotesk", Inter, sans-serif;
            }
            * {
                box-sizing: border-box;
                margin: 0;
                padding: 0;
            }
            html {
                scroll-behavior: smooth;
            }
            body {
                font-family: var(--sans);
                color: var(--ink);
                background: #fff;
                line-height: 1.6;
                overflow-x: hidden;
            }
            a {
                text-decoration: none;
                color: inherit;
            }
            img {
                max-width: 100%;
                display: block;
            }
            button,
            input {
                font: inherit;
            }
            .container {
                width: min(var(--max), calc(100% - 48px));
                margin: auto;
            }
            .section {
                padding: 100px 0;
            }
            .kicker {
                display: inline-flex;
                align-items: center;
                gap: 10px;
                font-size: 0.72rem;
                font-weight: 700;
                letter-spacing: 0.14em;
                text-transform: uppercase;
                color: var(--blue);
                font-family: var(--display);
            }
            .kicker::before {
                content: "";
                width: 28px;
                height: 2.5px;
                background: var(--green);
                border-radius: 99px;
            }

            .nav {
                position: fixed;
                inset: 0 0 auto;
                z-index: 100;
                height: 76px;
                background: rgba(5, 21, 43, 0.75);
                backdrop-filter: blur(20px);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                transition: all 0.3s;
            }
            .nav.scrolled {
                background: rgba(5, 21, 43, 0.92);
                box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
            }
            .nav-inner {
                height: 100%;
                display: flex;
                align-items: center;
                justify-content: space-between;
                gap: 28px;
            }
            .logo img {
                height: 38px;
                width: auto;
                filter: brightness(0) invert(1);
            }
            .nav-links {
                display: flex;
                align-items: center;
                gap: 6px;
                list-style: none;
            }
            .nav-links a {
                padding: 9px 14px;
                border-radius: 10px;
                color: rgba(255, 255, 255, 0.55);
                font-size: 0.84rem;
                font-weight: 600;
                transition: all 0.2s;
            }
            .nav-links a:hover,
            .nav-links a.active {
                color: #fff;
                background: rgba(255, 255, 255, 0.08);
            }
            .nav-actions {
                display: flex;
                align-items: center;
                gap: 10px;
            }
            .btn {
                min-height: 48px;
                padding: 11px 22px;
                border-radius: 12px;
                display: inline-flex;
                align-items: center;
                justify-content: center;
                gap: 9px;
                border: 1px solid transparent;
                font-size: 0.85rem;
                font-weight: 700;
                transition: all 0.3s;
                cursor: pointer;
                font-family: var(--sans);
            }
            .btn:hover {
                transform: translateY(-2px);
            }
            .btn-primary {
                background: var(--blue);
                color: #fff;
                box-shadow: 0 10px 28px rgba(13, 143, 219, 0.35);
            }
            .btn-primary:hover {
                background: #0a7ec7;
            }
            .btn-ghost-nav {
                background: rgba(255, 255, 255, 0.06);
                color: #fff;
                border-color: rgba(255, 255, 255, 0.15);
            }
            .btn-ghost-nav:hover {
                background: rgba(255, 255, 255, 0.14);
            }
            .btn-outline {
                background: transparent;
                color: var(--navy);
                border-color: var(--line);
            }
            .btn-outline:hover {
                border-color: var(--blue);
                color: var(--blue);
                background: rgba(13, 143, 219, 0.04);
            }
            .btn-green {
                background: var(--green);
                color: var(--navy);
                box-shadow: 0 10px 28px rgba(46, 204, 113, 0.3);
            }
            .btn-green:hover {
                background: #27b363;
            }
            .menu-btn {
                display: none;
                border: 0;
                background: transparent;
                color: #fff;
                font-size: 1.3rem;
                cursor: pointer;
                width: 44px;
                height: 44px;
                border-radius: 10px;
            }
            .menu-btn:hover {
                background: rgba(255, 255, 255, 0.08);
            }
            .mobile-panel {
                display: none;
                position: fixed;
                top: 76px;
                left: 0;
                right: 0;
                z-index: 99;
                background: rgba(5, 21, 43, 0.96);
                backdrop-filter: blur(20px);
                padding: 16px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
                flex-direction: column;
                gap: 4px;
            }
            .mobile-panel.open {
                display: flex;
            }
            .mobile-panel a {
                padding: 14px 16px;
                border-radius: 12px;
                font-weight: 600;
                color: rgba(255, 255, 255, 0.7);
                font-size: 0.9rem;
                transition: all 0.2s;
            }
            .mobile-panel a:hover {
                background: rgba(255, 255, 255, 0.06);
                color: #fff;
            }
            .mobile-panel .btn {
                margin-top: 8px;
                justify-content: center;
            }

            .hero-detail {
                position: relative;
                min-height: 420px;
                background: linear-gradient(135deg, var(--navy) 0%, #0a1f3d 50%, #0d2847 100%);
                display: flex;
                align-items: flex-end;
                overflow: hidden;
                padding-top: 76px;
            }
            .hero-detail::before {
                content: "";
                position: absolute;
                inset: 0;
                background: radial-gradient(ellipse 70% 60% at 80% 30%, rgba(13, 143, 219, 0.1) 0%, transparent 60%),
                    radial-gradient(ellipse 40% 40% at 15% 70%, rgba(46, 204, 113, 0.05) 0%, transparent 50%);
                pointer-events: none;
            }
            .hero-detail-inner {
                position: relative;
                z-index: 2;
                padding: 60px 0 50px;
            }
            .breadcrumb {
                display: flex;
                align-items: center;
                gap: 10px;
                font-size: 0.78rem;
                color: rgba(255, 255, 255, 0.4);
                margin-bottom: 20px;
                flex-wrap: wrap;
            }
            .breadcrumb a:hover {
                color: var(--blue-glow);
            }
            .breadcrumb i {
                font-size: 0.6rem;
                color: rgba(255, 255, 255, 0.25);
            }
            .hero-detail h1 {
                font-family: var(--display);
                font-size: clamp(2rem, 4.5vw, 3.4rem);
                line-height: 1.05;
                letter-spacing: -0.035em;
                color: #fff;
                margin-bottom: 18px;
                font-weight: 700;
                max-width: 800px;
            }
            .hero-detail .lead {
                font-size: 1.05rem;
                color: rgba(255, 255, 255, 0.5);
                max-width: 640px;
                line-height: 1.65;
                margin-bottom: 28px;
            }
            .hero-meta {
                display: flex;
                gap: 20px;
                flex-wrap: wrap;
            }
            .hero-meta span {
                display: inline-flex;
                align-items: center;
                gap: 8px;
                padding: 8px 16px;
                border-radius: 10px;
                background: rgba(255, 255, 255, 0.05);
                border: 1px solid rgba(255, 255, 255, 0.1);
                color: rgba(255, 255, 255, 0.7);
                font-size: 0.8rem;
                font-weight: 600;
            }
            .hero-meta i {
                color: var(--blue-glow);
            }

            .detail-grid {
                display: grid;
                grid-template-columns: 1fr 360px;
                gap: 48px;
                padding: 64px 0 100px;
            }
            .detail-main h2 {
                font-family: var(--display);
                font-size: 1.6rem;
                color: var(--navy);
                margin-bottom: 18px;
                font-weight: 700;
                letter-spacing: -0.02em;
            }
            .detail-main p {
                color: var(--muted);
                font-size: 0.95rem;
                line-height: 1.75;
                margin-bottom: 18px;
            }
            .detail-main ul {
                list-style: none;
                margin-bottom: 24px;
            }
            .detail-main ul li {
                position: relative;
                padding-left: 28px;
                margin-bottom: 10px;
                color: var(--muted);
                font-size: 0.92rem;
                line-height: 1.6;
            }
            .detail-main ul li::before {
                content: "\f00c";
                font-family: "Font Awesome 6 Free";
                font-weight: 900;
                position: absolute;
                left: 0;
                top: 2px;
                color: var(--green);
                font-size: 0.85rem;
            }
            .curriculum-module {
                border: 1px solid var(--line);
                border-radius: 16px;
                margin-bottom: 12px;
                overflow: hidden;
            }
            .module-header {
                display: flex;
                align-items: center;
                justify-content: space-between;
                padding: 18px 22px;
                background: var(--soft);
                cursor: pointer;
                transition: background 0.2s;
            }
            .module-header:hover {
                background: #e6ecf3;
            }
            .module-header h4 {
                font-family: var(--display);
                font-size: 0.95rem;
                color: var(--navy);
                font-weight: 700;
            }
            .module-header span {
                font-size: 0.75rem;
                color: var(--muted);
                font-weight: 600;
            }
            .module-body {
                display: none;
                padding: 8px 22px 18px;
            }
            .module-body.open {
                display: block;
            }
            .lesson-row {
                display: flex;
                align-items: center;
                justify-content: space-between;
                padding: 12px 0;
                border-bottom: 1px solid var(--line);
                font-size: 0.88rem;
                color: var(--ink);
            }
            .lesson-row:last-child {
                border-bottom: none;
            }
            .lesson-row span {
                display: flex;
                align-items: center;
                gap: 10px;
                color: var(--muted);
                font-size: 0.78rem;
            }

            .sidebar-card {
                background: #fff;
                border: 1px solid var(--line);
                border-radius: var(--radius-lg);
                padding: 28px;
                margin-bottom: 24px;
                position: sticky;
                top: 100px;
            }
            .sidebar-card h3 {
                font-family: var(--display);
                font-size: 1.1rem;
                color: var(--navy);
                margin-bottom: 18px;
                font-weight: 700;
            }
            .price-tag {
                font-family: var(--display);
                font-size: 2.2rem;
                font-weight: 700;
                color: var(--navy);
                margin-bottom: 4px;
            }
            .price-tag span {
                font-size: 0.85rem;
                color: var(--muted);
                font-weight: 500;
            }
            .includes-list {
                list-style: none;
                display: grid;
                gap: 10px;
                margin: 20px 0;
            }
            .includes-list li {
                display: flex;
                align-items: center;
                gap: 10px;
                font-size: 0.84rem;
                color: var(--muted);
            }
            .includes-list i {
                color: var(--green);
                font-size: 0.85rem;
                width: 18px;
            }
            .sidebar-meta {
                display: grid;
                gap: 14px;
                margin-bottom: 20px;
            }
            .sidebar-meta div {
                display: flex;
                align-items: center;
                gap: 10px;
                font-size: 0.82rem;
                color: var(--muted);
            }
            .sidebar-meta i {
                color: var(--blue);
                width: 18px;
            }
            .related-mini {
                display: flex;
                gap: 14px;
                padding: 14px 0;
                border-bottom: 1px solid var(--line);
                transition: all 0.2s;
            }
            .related-mini:hover {
                transform: translateX(4px);
            }
            .related-mini:last-child {
                border-bottom: none;
            }
            .related-mini img {
                width: 56px;
                height: 56px;
                border-radius: 12px;
                object-fit: cover;
                background: var(--navy);
                opacity: 0.8;
            }
            .related-mini div h5 {
                font-family: var(--display);
                font-size: 0.85rem;
                color: var(--navy);
                font-weight: 700;
                margin-bottom: 4px;
            }
            .related-mini div span {
                font-size: 0.72rem;
                color: var(--muted);
            }

            .reviews-grid {
                display: grid;
                grid-template-columns: repeat(3, 1fr);
                gap: 20px;
            }
            .review-card {
                background: #fff;
                border: 1px solid var(--line);
                border-radius: var(--radius);
                padding: 28px;
                transition: all 0.3s;
            }
            .review-card:hover {
                transform: translateY(-4px);
                box-shadow: var(--shadow);
                border-color: transparent;
            }
            .review-stars {
                color: #f5a623;
                font-size: 0.8rem;
                margin-bottom: 12px;
            }
            .review-card p {
                font-size: 0.88rem;
                color: var(--muted);
                line-height: 1.65;
                margin-bottom: 16px;
            }
            .review-author {
                display: flex;
                align-items: center;
                gap: 12px;
            }
            .review-author img {
                width: 40px;
                height: 40px;
                border-radius: 50%;
                object-fit: cover;
                background: var(--soft);
            }
            .review-author div h5 {
                font-size: 0.85rem;
                color: var(--navy);
                font-weight: 700;
            }
            .review-author div span {
                font-size: 0.72rem;
                color: var(--muted);
            }

            .footer {
                background: #040e1c;
                color: #fff;
                padding: 70px 0 24px;
            }
            .footer-grid {
                display: grid;
                grid-template-columns: 1.6fr 1fr 1fr 1fr;
                gap: 40px;
                padding-bottom: 50px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            }
            .footer-brand img {
                height: 36px;
                margin-bottom: 20px;
                filter: brightness(0) invert(1);
                opacity: 0.9;
            }
            .footer-brand p {
                font-size: 0.82rem;
                color: rgba(255, 255, 255, 0.35);
                max-width: 320px;
                line-height: 1.7;
            }
            .footer h4 {
                font-size: 0.7rem;
                text-transform: uppercase;
                letter-spacing: 0.12em;
                margin-bottom: 20px;
                color: rgba(255, 255, 255, 0.5);
                font-family: var(--display);
            }
            .footer ul {
                list-style: none;
                display: grid;
                gap: 11px;
            }
            .footer li a {
                font-size: 0.8rem;
                color: rgba(255, 255, 255, 0.38);
                transition: color 0.2s;
            }
            .footer li a:hover {
                color: #fff;
            }
            .footer-bottom {
                display: flex;
                justify-content: space-between;
                gap: 20px;
                flex-wrap: wrap;
                padding-top: 24px;
                color: rgba(255, 255, 255, 0.22);
                font-size: 0.68rem;
            }

            .reveal {
                opacity: 0;
                transform: translateY(30px);
                transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
            }
            .reveal.visible {
                opacity: 1;
                transform: translateY(0);
            }

            @media (max-width: 1050px) {
                .nav-links,
                .nav-actions {
                    display: none;
                }
                .menu-btn {
                    display: block;
                }
                .detail-grid {
                    grid-template-columns: 1fr;
                }
                .sidebar-card {
                    position: static;
                }
                .reviews-grid {
                    grid-template-columns: repeat(2, 1fr);
                }
                .footer-grid {
                    grid-template-columns: repeat(2, 1fr);
                }
            }
            @media (max-width: 720px) {
                .container {
                    width: min(100% - 32px, var(--max));
                }
                .section {
                    padding: 80px 0;
                }
                .hero-detail {
                    padding-top: 66px;
                    min-height: auto;
                }
                .hero-detail h1 {
                    font-size: clamp(1.8rem, 8vw, 2.6rem);
                }
                .reviews-grid {
                    grid-template-columns: 1fr;
                }
                .footer-grid {
                    grid-template-columns: 1fr;
                }
                .mobile-panel {
                    top: 66px;
                }
            }