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

        html {
            scroll-behavior: smooth;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        html::-webkit-scrollbar {
            display: none;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: #1A1A1A;
            background: #FFFFFF;
            overflow-x: hidden;
        }

        /* Color system - LIGHT THEME */
        :root {
            --bg-primary: #FFFFFF;
            --bg-secondary: #F8F8FA;
            --bg-tertiary: #F0F0F3;
            --text-primary: #1A1A1A;
            --text-secondary: #555555;
            --text-tertiary: #888888;
            --accent: #FFBB58;
            --accent-glow: rgba(255, 187, 88, 0.15);
            --border: rgba(0, 0, 0, 0.08);
        }

        /* Typography */
        h1 {
            font-size: clamp(48px, 7vw, 64px);
            font-weight: 600;
            line-height: 1.1;
            letter-spacing: -0.02em;
            color: var(--text-primary);
        }

        h2 {
            font-size: clamp(32px, 5vw, 40px);
            font-weight: 600;
            line-height: 1.2;
            letter-spacing: -0.01em;
            color: var(--text-primary);
            margin-bottom: 24px;
        }

        h3 {
            font-size: 18px;
            font-weight: 600;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        body, p, li {
            font-size: 17px;
            font-weight: 400;
            line-height: 1.7;
            color: var(--text-secondary);
        }

        .label {
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent);
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        a:hover {
            color: #FFD080;
        }

        /* Layout */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
        }

        section {
            padding: 72px 0;
            position: relative;
        }

        @media (max-width: 768px) {
            section {
                padding: 56px 0;
            }
        }

        @media (max-width: 480px) {
            section {
                padding: 40px 0;
            }
        }

        /* Navigation */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: transparent;
            transition: all 0.3s ease;
            padding: 24px 32px;
        }

        header.scrolled {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border);
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
        }

        .logo {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .logo-sub {
            font-size: 11px;
            font-weight: 400;
            color: var(--text-tertiary);
            display: block;
            margin-top: -4px;
        }

        .nav-links {
            display: flex;
            gap: 48px;
            list-style: none;
            align-items: center;
        }

        .nav-links a {
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 400;
            transition: color 0.3s ease;
        }

        .nav-links a:hover {
            color: var(--accent);
        }

        .nav-cta {
            background: var(--accent);
            color: #FFFFFF;
            padding: 10px 20px;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .nav-cta:hover {
            background: #FFD080;
            color: #FFFFFF;
            box-shadow: 0 4px 12px rgba(255, 187, 88, 0.3);
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            border: none;
        }

        .btn-primary {
            background: var(--accent);
            color: #FFFFFF;
            box-shadow: 0 2px 16px rgba(255, 187, 88, 0.2);
        }

        .btn-primary:hover {
            background: #FFD080;
            color: #FFFFFF;
            box-shadow: 0 4px 24px rgba(255, 187, 88, 0.3);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background: var(--bg-secondary);
            color: var(--text-primary);
            border: 1px solid var(--border);
        }

        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
        }

        /* Hero Section */
        .hero {
            position: relative;
            overflow: hidden;
            min-height: auto;
            padding-top: 140px;
            padding-bottom: 56px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--bg-secondary);
        }

        @media (max-width: 768px) {
            .hero {
                padding-top: 110px;
                padding-bottom: 48px;
            }
        }

        @media (max-width: 480px) {
            .hero {
                padding-top: 80px;
                padding-bottom: 40px;
            }
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: transparent;
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
        }

        .hero h1 {
            margin-bottom: 24px;
        }

        .hero p {
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 32px;
        }

        /* Video Section */
        .video-section {
            padding: 80px 0;
            text-align: center;
        }

        .video-section h2 {
            margin-bottom: 48px;
            text-align: center;
        }

        .video-container {
            max-width: 896px;
            margin: 0 auto;
            position: relative;
            width: 100%;
            padding-bottom: 56.25%;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            background: #1A1A1A;
        }

        .video-content {
            position: absolute;
            inset: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 12px;
            background: rgba(0, 0, 0, 0.45);
        }

        .play-btn {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: white;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .play-btn:hover {
            transform: scale(1.1);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
        }

        .video-subtitle {
            color: rgba(255, 255, 255, 0.8);
            font-size: 16px;
            font-weight: 600;
        }

        .video-caption {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 16px;
        }

        /* Tutorial Cards Section */
        .tutorial-section {
            padding: 80px 0;
        }

        .tutorial-section h2 {
            text-align: center;
            margin-bottom: 64px;
        }

        .tutorial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .tutorial-card {
            padding: 32px;
            background: var(--bg-secondary);
            border-radius: 12px;
            border: 1px solid var(--border);
            transition: all 0.3s ease;
        }

        .tutorial-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        }

        .tutorial-card h3 {
            font-size: 18px;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .tutorial-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* Bottom CTA Section */
        .bottom-cta {
            background: linear-gradient(135deg, rgba(255, 187, 88, 0.1) 0%, rgba(255, 187, 88, 0.05) 100%);
            border-radius: 12px;
            border: 1px solid var(--accent-glow);
            padding: 60px 40px;
            text-align: center;
            margin: 80px 0;
        }

        .bottom-cta h2 {
            margin-bottom: 20px;
        }

        .bottom-cta p {
            font-size: 18px;
            margin-bottom: 32px;
        }

        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        footer {
            background: var(--text-primary);
            color: #FFFFFF;
            padding: 60px 32px;
            margin-top: 60px;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-section h4 {
            font-size: 14px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 16px;
            color: var(--accent);
        }

        .footer-section ul {
            list-style: none;
        }

        .footer-section a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
            display: block;
            margin-bottom: 8px;
            transition: color 0.3s ease;
        }

        .footer-section a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 32px;
            text-align: center;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
        }

        /* Animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .reveal {
            opacity: 0;
        }

        .reveal.visible {
            opacity: 1;
            animation: fadeInUp 0.6s ease forwards;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }

            section {
                padding: 60px 0;
            }

            header {
                padding: 16px 20px;
            }

            nav {
                flex-wrap: wrap;
                gap: 20px;
            }

            .nav-links {
                gap: 24px;
                font-size: 14px;
            }

            h1 {
                font-size: 36px;
            }

            h2 {
                font-size: 28px;
            }

            .hero {
                padding-top: 120px;
                padding-bottom: 60px;
            }

            .hero p {
                font-size: 16px;
            }

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

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

            .cta-buttons .btn {
                width: 100%;
            }
        }