/* roulang page: index */
:root {
            --primary: #FF6B00;
            --primary-hover: #E05E00;
            --primary-light: #FFF5EC;
            --secondary: #0D253F;
            --secondary-dark: #071524;
            --secondary-light: #1A365D;
            --dark-bg: #0A192F;
            --dark-card: #112240;
            --light-bg: #F8FAFC;
            --white: #FFFFFF;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --text-light: #94A3B8;
            --border-color: #E2E8F0;
            --accent-green: #10B981;
            --accent-yellow: #FBBF24;
            --shadow-sm: 0 2px 8px rgba(13, 37, 63, 0.04);
            --shadow-md: 0 8px 24px -4px rgba(13, 37, 63, 0.08);
            --shadow-lg: 0 16px 36px -6px rgba(13, 37, 63, 0.12);
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-full: 9999px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--light-bg);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        ul {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Top Bar */
        .topbar {
            background-color: var(--secondary-dark);
            color: var(--text-light);
            font-size: 0.85rem;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .topbar-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .topbar-left span {
            margin-right: 20px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .topbar-right a {
            color: var(--text-light);
            margin-left: 15px;
        }

        .topbar-right a:hover {
            color: var(--primary);
        }

        /* Main Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background-color: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-sm);
            border-bottom: 1px solid var(--border-color);
        }

        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.45rem;
            font-weight: 800;
            color: var(--secondary);
            letter-spacing: -0.5px;
        }

        .brand-logo i {
            color: var(--primary);
            font-size: 1.7rem;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-link {
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--secondary);
            padding: 8px 4px;
            position: relative;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--primary);
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary);
            transition: var(--transition);
        }

        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }

        .header-action {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 24px;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .btn-primary {
            background: linear-gradient(135deg, #FF6B00 0%, #FF8833 100%);
            color: var(--white);
            box-shadow: 0 4px 14px rgba(255, 107, 0, 0.28);
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, #E05E00 0%, #FF6B00 100%);
            box-shadow: 0 6px 18px rgba(255, 107, 0, 0.38);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background-color: var(--white);
            color: var(--secondary);
            border-color: var(--border-color);
        }

        .btn-secondary:hover {
            border-color: var(--secondary);
            background-color: var(--light-bg);
            color: var(--secondary-light);
        }

        .btn-outline-white {
            background: transparent;
            color: var(--white);
            border-color: rgba(255, 255, 255, 0.4);
        }

        .btn-outline-white:hover {
            background-color: rgba(255, 255, 255, 0.1);
            border-color: var(--white);
        }

        /* Mobile Menu Toggle */
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--secondary);
            cursor: pointer;
        }

        /* Section Commons */
        .section-block {
            padding: 85px 0;
            position: relative;
        }

        .section-header {
            text-align: center;
            max-width: 780px;
            margin: 0 auto 55px auto;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            background-color: var(--primary-light);
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 700;
            border-radius: var(--radius-full);
            margin-bottom: 12px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .section-title {
            font-size: 2.15rem;
            font-weight: 800;
            color: var(--secondary);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* Hero: Video & Interactive Visual */
        .hero-banner {
            position: relative;
            background-image: linear-gradient(rgba(13, 37, 63, 0.82), rgba(10, 25, 47, 0.92)), url('/assets/images/45024d6e147a082d.jpg');
            background-size: cover;
            background-position: center;
            color: var(--white);
            padding: 120px 0 100px;
            overflow: hidden;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: rgba(255, 107, 0, 0.2);
            color: #FFA466;
            border: 1px solid rgba(255, 107, 0, 0.4);
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-size: 0.88rem;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 2.9rem;
            font-weight: 800;
            line-height: 1.22;
            margin-bottom: 20px;
            letter-spacing: -0.8px;
        }

        .hero-desc {
            font-size: 1.1rem;
            color: #CBD5E1;
            line-height: 1.8;
            margin-bottom: 34px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 36px;
        }

        .hero-trust-bar {
            display: flex;
            align-items: center;
            gap: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 24px;
        }

        .trust-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.88rem;
            color: #94A3B8;
        }

        .trust-item i {
            color: var(--primary);
            font-size: 1.1rem;
        }

        .hero-video-box {
            position: relative;
            background: #112240;
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-lg);
            padding: 12px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        }

        .video-cover {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            aspect-ratio: 16 / 10;
        }

        .video-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .play-btn-circle {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 68px;
            height: 68px;
            background: rgba(255, 107, 0, 0.9);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 0 0 8px rgba(255, 107, 0, 0.3);
            transition: var(--transition);
        }

        .play-btn-circle:hover {
            transform: translate(-50%, -50%) scale(1.1);
            background: #FF6B00;
        }

        /* Product Value & Pain Points */
        .pain-solution-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .dual-card-container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .contrast-card {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 24px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .contrast-card.bad {
            border-left: 4px solid #EF4444;
        }

        .contrast-card.good {
            border-left: 4px solid var(--accent-green);
        }

        .contrast-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .contrast-card.bad h4 { color: #DC2626; }
        .contrast-card.good h4 { color: #059669; }

        .image-collage-wrap {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }

        .image-collage-wrap img {
            width: 100%;
            height: 420px;
            object-fit: cover;
        }

        .collage-badge {
            position: absolute;
            bottom: 24px;
            right: 24px;
            background: rgba(13, 37, 63, 0.95);
            color: var(--white);
            padding: 16px 20px;
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.15);
            max-width: 240px;
        }

        /* 6 Core Advantages Grid */
        .grid-3-col {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .advantage-card {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }

        .advantage-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(255, 107, 0, 0.4);
        }

        .icon-box-lg {
            width: 58px;
            height: 58px;
            border-radius: 12px;
            background-color: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
            transition: var(--transition);
        }

        .advantage-card:hover .icon-box-lg {
            background-color: var(--primary);
            color: var(--white);
        }

        .advantage-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 12px;
        }

        .advantage-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.65;
        }

        /* Step Guide */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            position: relative;
        }

        .step-item {
            background: var(--white);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            border: 1px solid var(--border-color);
            position: relative;
        }

        .step-number {
            font-size: 2.8rem;
            font-weight: 900;
            color: #E2E8F0;
            line-height: 1;
            margin-bottom: 16px;
        }

        .step-item h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 12px;
        }

        /* 3 Big Courses / Programs */
        .course-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .course-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }

        .course-img {
            height: 210px;
            overflow: hidden;
            position: relative;
        }

        .course-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .course-card:hover .course-img img {
            transform: scale(1.05);
        }

        .age-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            background: rgba(13, 37, 63, 0.85);
            color: #fff;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.78rem;
            font-weight: 600;
            backdrop-filter: blur(4px);
        }

        .course-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }

        .course-body h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 10px;
        }

        .course-body p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.6;
            margin-bottom: 20px;
            flex-grow: 1;
        }

        .course-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid var(--border-color);
            padding-top: 16px;
            margin-bottom: 16px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Dark Immersive Vision Section */
        .dark-immersive-section {
            background-color: var(--dark-bg);
            color: var(--white);
            padding: 90px 0;
        }

        .dark-immersive-section .section-title {
            color: var(--white);
        }

        .dark-immersive-section .section-subtitle {
            color: #94A3B8;
        }

        .philosophy-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .philosophy-card {
            background: var(--dark-card);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 32px 24px;
        }

        .philosophy-card .phase-badge {
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
            display: block;
        }

        .philosophy-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--white);
        }

        .philosophy-card p {
            color: #94A3B8;
            font-size: 0.92rem;
            line-height: 1.68;
        }

        /* Data Metric Strip */
        .metric-strip-section {
            background: linear-gradient(135deg, #0D253F 0%, #1A365D 100%);
            padding: 55px 0;
            color: var(--white);
        }

        .metric-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }

        .metric-num {
            font-size: 2.7rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 8px;
        }

        .metric-label {
            font-size: 0.95rem;
            color: #CBD5E1;
            font-weight: 500;
        }

        /* Testimonials / Stories Wall */
        .story-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .story-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 28px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .story-user {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 18px;
        }

        .story-avatar {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: #E2E8F0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--secondary);
            font-weight: 700;
        }

        .story-name {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--secondary);
        }

        .story-tag {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .story-quote {
            font-size: 0.93rem;
            color: var(--text-main);
            line-height: 1.65;
            margin-bottom: 16px;
        }

        .metric-badge-box {
            background: var(--light-bg);
            padding: 10px 14px;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
        }

        /* Age Group Stage Guide */
        .age-bracket-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .bracket-card {
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            text-align: center;
            transition: var(--transition);
        }

        .bracket-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
        }

        .bracket-age {
            font-size: 1.45rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 6px;
        }

        .bracket-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 12px;
        }

        .bracket-desc {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
            text-align: left;
        }

        /* Dynamic News & Tips */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .news-card {
            background: var(--white);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .news-card:hover {
            box-shadow: var(--shadow-md);
        }

        .news-thumb {
            height: 180px;
            overflow: hidden;
        }

        .news-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .news-content {
            padding: 20px;
        }

        .news-date {
            font-size: 0.8rem;
            color: var(--text-light);
            margin-bottom: 8px;
        }

        .news-content h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .news-content p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* Safety & System Guarantee */
        .safety-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .safety-card {
            background: var(--white);
            padding: 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            text-align: center;
        }

        .safety-card i {
            font-size: 2rem;
            color: var(--accent-green);
            margin-bottom: 16px;
        }

        .safety-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 8px;
        }

        .safety-card p {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* FAQ Accordion */
        .faq-accordion {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--white);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            border: 1px solid var(--border-color);
            overflow: hidden;
        }

        .faq-question {
            padding: 20px 24px;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--secondary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--primary);
        }

        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            max-height: 240px;
            padding-bottom: 20px;
        }

        /* Conversion CTA & Fast Form */
        .conversion-banner {
            background: linear-gradient(135deg, #FF6B00 0%, #E05E00 100%);
            border-radius: var(--radius-lg);
            padding: 55px 48px;
            color: var(--white);
            box-shadow: 0 20px 40px rgba(255, 107, 0, 0.25);
        }

        .conversion-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 40px;
            align-items: center;
        }

        .conversion-left h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 16px;
            line-height: 1.25;
        }

        .conversion-left p {
            font-size: 1.05rem;
            color: #FFE5D4;
            line-height: 1.7;
        }

        .fast-form {
            background: var(--white);
            padding: 30px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            color: var(--text-main);
        }

        .fast-form h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 16px;
            text-align: center;
        }

        .form-group {
            margin-bottom: 14px;
        }

        .form-control {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 0.92rem;
            outline: none;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(255, 107, 0, 0.15);
        }

        .btn-submit {
            width: 100%;
            padding: 13px;
            font-size: 1rem;
            font-weight: 700;
            background: var(--secondary);
            color: var(--white);
            border: none;
            border-radius: 6px;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-submit:hover {
            background: var(--secondary-light);
        }

        /* Footer */
        .site-footer {
            background-color: var(--secondary-dark);
            color: #94A3B8;
            padding: 70px 0 30px;
            font-size: 0.92rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 50px;
        }

        .footer-logo {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--white);
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 18px;
        }

        .footer-logo i {
            color: var(--primary);
        }

        .footer-col h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 8px;
        }

        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 28px;
            height: 2px;
            background-color: var(--primary);
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a:hover {
            color: var(--primary);
            padding-left: 4px;
        }

        .footer-contact li {
            margin-bottom: 12px;
            display: flex;
            gap: 10px;
            align-items: flex-start;
        }

        .footer-contact i {
            color: var(--primary);
            margin-top: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 25px;
            text-align: center;
            font-size: 0.85rem;
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-actions, .hero-trust-bar {
                justify-content: center;
            }
            .grid-3-col, .philosophy-grid, .story-grid, .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .age-bracket-grid, .safety-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .metric-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 36px;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .conversion-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .topbar { display: none; }
            .mobile-toggle { display: block; }
            .nav-menu {
                position: fixed;
                top: 76px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 76px);
                background: #FFFFFF;
                flex-direction: column;
                align-items: flex-start;
                padding: 30px;
                gap: 20px;
                box-shadow: var(--shadow-lg);
                transition: left 0.35s ease;
            }
            .nav-menu.open {
                left: 0;
            }
            .header-action .btn { display: none; }
            .hero-title { font-size: 2.1rem; }
            .section-title { font-size: 1.75rem; }
            .grid-3-col, .steps-container, .philosophy-grid, .story-grid, .news-grid, .pain-solution-grid {
                grid-template-columns: 1fr;
            }
            .age-bracket-grid, .safety-grid, .footer-grid {
                grid-template-columns: 1fr;
            }
            .conversion-banner {
                padding: 36px 20px;
            }
        }