:root {
            --bg-main: #0b0f19;
            --bg-card: #131a26;
            --primary: #10b981;
            --primary-glow: rgba(16, 185, 129, 0.15);
            --text-pure: #ffffff;
            --text-muted: #9ca3af;
            --text-dark: #6b7280;
            --border: #1f2937;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-main);
            color: var(--text-pure);
            line-height: 1.6;
            letter-spacing: -0.01em;
            -webkit-font-smoothing: antialiased;
        }
        header {
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            background: rgba(11, 15, 25, 0.8);
            backdrop-filter: blur(12px);
            z-index: 100;
        }
        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 2rem;
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            text-decoration: none;
            gap: 0.75rem;
        }
        .logo-img {
            width: 28px;
            height: 28px;
            object-fit: contain;
        }
        .logo-text {
            font-size: 1.1rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            color: var(--text-pure);
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 2.5rem;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--text-muted);
            margin-left: 2rem;
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.2s;
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--primary);
        }
        .github-icon-link {
            color: var(--text-muted);
            transition: color 0.2s;
            display: flex;
            align-items: center;
        }
        .github-icon-link:hover {
            color: var(--text-pure);
        }
        
        .hero-banner-section {
            max-width: 1200px;
            margin: 0 auto;
            padding: 5rem 2rem 4rem;
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 4rem;
            align-items: center;
            position: relative;
        }
        .hero-banner-section::before {
            content: "";
            position: absolute;
            top: 10%;
            left: 30%;
            width: 400px;
            height: 400px;
            background: var(--primary);
            opacity: 0.06;
            filter: blur(100px);
            pointer-events: none;
        }
        .hero-text-content {
            text-align: left;
        }
        .badge-stable {
            display: inline-block;
            background: rgba(16, 185, 129, 0.1);
            border: 1px solid rgba(16, 185, 129, 0.2);
            color: var(--primary);
            padding: 0.35rem 0.9rem;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 1.5rem;
        }
        .hero-text-content h1 {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.03em;
            margin-bottom: 1.5rem;
            background: linear-gradient(to bottom right, #ffffff 40%, #9ca3af);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-text-content p {
            font-size: 1.15rem;
            color: var(--text-muted);
            margin-bottom: 2.5rem;
            line-height: 1.6;
        }
        .hero-cta-group {
            display: flex;
            gap: 1rem;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #000000;
            text-decoration: none;
            padding: 0.9rem 2.2rem;
            border-radius: 6px;
            font-weight: 600;
            font-size: 1rem;
            transition: opacity 0.2s, transform 0.2s;
        }
        .btn-primary:hover {
            opacity: 0.9;
            transform: translateY(-1px);
        }
        .btn-secondary {
            background-color: transparent;
            color: var(--text-pure);
            border: 1px solid var(--border);
            text-decoration: none;
            padding: 0.9rem 2.2rem;
            border-radius: 6px;
            font-weight: 600;
            font-size: 1rem;
            transition: background-color 0.2s, border-color 0.2s;
        }
        .btn-secondary:hover {
            background-color: rgba(255, 255, 255, 0.03);
            border-color: var(--text-muted);
        }
        .hero-image-slot {
            width: 100%;
            aspect-ratio: 4 / 3;
            background-color: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            position: relative;
            box-shadow: 0 15px 35px rgba(0,0,0,0.4);
        }
        .hero-image-slot img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        
        .youtube-multimedia-wrapper {
            max-width: 1200px;
            margin: 2rem auto 4rem;
            padding: 0 2rem;
        }
        .video-aspect-container {
            position: relative;
            width: 100%;
            padding-bottom: 56.25%; 
            height: 0;
            background-color: #0d131e;
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }
        .video-aspect-container iframe {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border: 0;
        }
        
        .stats-grid {
            max-width: 1136px;
            margin: 4rem auto 0;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            border: 1px solid var(--border);
            border-radius: 8px;
            background-color: rgba(19, 26, 38, 0.4);
        }
        .stat-card {
            padding: 2rem;
            text-align: center;
        }
        .stat-card:not(:last-child) {
            border-right: 1px solid var(--border);
        }
        .stat-num {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--text-pure);
            font-family: monospace;
            margin-bottom: 0.25rem;
        }
        .stat-label {
            font-size: 0.85rem;
            color: var(--text-dark);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        
        .deep-intro-section {
            max-width: 1200px;
            margin: 6rem auto 0;
            padding: 0 2rem;
        }
        .intro-row {
            display: grid;
            grid-template-columns: 80px 1fr;
            gap: 2.5rem;
            margin-bottom: 5rem;
            padding: 3rem;
            background-color: rgba(19, 26, 38, 0.3);
            border: 1px solid var(--border);
            border-radius: 12px;
        }
        .intro-icon-wrap {
            color: var(--primary);
            background: rgba(16, 185, 129, 0.05);
            border: 1px solid rgba(16, 185, 129, 0.15);
            width: 80px;
            height: 80px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .intro-text-block h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 1.25rem;
            line-height: 1.3;
            background: linear-gradient(135deg, #ffffff 0%, #9ca3af 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .intro-text-block p {
            color: var(--text-muted);
            font-size: 1.05rem;
            line-height: 1.7;
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .intro-feature-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }
        .intro-feature-list li {
            color: var(--text-pure);
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .intro-feature-list li::before {
            content: "→";
            color: var(--primary);
            font-weight: bold;
        }
        
        .features-section {
            max-width: 1200px;
            margin: 0 auto;
            padding: 4rem 2rem 8rem;
        }
        .section-header {
            margin-bottom: 4rem;
            text-align: center;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .section-header p {
            color: var(--text-dark);
            font-size: 1rem;
        }
        .feature-matrix {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
            gap: 1.5rem;
        }
        .feat-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 2.5rem 2rem;
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        .feat-card:hover {
            border-color: rgba(16, 185, 129, 0.4);
            box-shadow: 0 0 20px var(--primary-glow);
        }
        .feat-icon {
            color: var(--primary);
            margin-bottom: 1.5rem;
            display: flex;
        }
        .feat-card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--text-pure);
        }
        .feat-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
            text-align: justify;
        }
        
        footer {
            border-top: 1px solid var(--border);
            background-color: #070a10;
            color: var(--text-dark);
            padding: 5rem 2rem 3rem;
            font-size: 0.9rem;
        }
        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr repeat(3, 1fr);
            gap: 4rem;
            padding-bottom: 4rem;
        }
        .footer-brand h4 {
            color: var(--text-pure);
            margin-bottom: 1rem;
            font-size: 1.1rem;
        }
        .footer-brand p {
            max-width: 260px;
            line-height: 1.6;
        }
        .footer-links h5 {
            color: var(--text-muted);
            margin-bottom: 1.2rem;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links ul li {
            margin-bottom: 0.75rem;
        }
        .footer-links a {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.2s;
        }
        .footer-links a:hover {
            color: var(--text-pure);
        }
        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.02);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }
        
        @media (max-width: 968px) {
            .hero-banner-section {
                grid-template-columns: 1fr;
                gap: 3rem;
                text-align: center;
            }
            .hero-text-content {
                text-align: center;
            }
            .hero-cta-group {
                justify-content: center;
            }
            .intro-row {
                grid-template-columns: 1fr;
                justify-items: center;
                text-align: center;
                padding: 2rem;
            }
            .intro-feature-list {
                grid-template-columns: 1fr;
                justify-items: start;
                max-width: 400px;
                margin: 0 auto;
            }
            .footer-content {
                grid-template-columns: 1fr 1fr;
                gap: 2.5rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .stat-card:not(:last-child) {
                border-right: none;
                border-bottom: 1px solid var(--border);
            }
        }
        @media (max-width: 768px) {
            .nav-container {
                padding: 1rem;
            }
            .nav-right {
                gap: 1.5rem;
            }
            .nav-links {
                display: none;
            }
            .hero-text-content h1 {
                font-size: 2.4rem;
            }
            .hero-cta-group {
                flex-direction: column;
                gap: 0.75rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }