:root {
            --bg-deep: #020810;
            --bg-card: #091420;
            --bg-card-hover: #0e1c2b;
            --accent: #00c4cc;
            --accent-2: #00e0b8;
            --accent-glow: rgba(0, 196, 204, 0.3);
            --accent-glow-strong: rgba(0, 196, 204, 0.5);
            --text-primary: #f0f4fa;
            --text-secondary: #9aafc4;
            --text-muted: #6b8399;
            --border-subtle: rgba(0, 196, 204, 0.12);
            --border-glow: rgba(0, 196, 204, 0.28);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 22px;
            --radius-xl: 28px;
            --radius-full: 50px;
            --shadow-card: 0 10px 36px rgba(0, 0, 0, 0.55);
            --shadow-glow: 0 0 36px rgba(0, 196, 204, 0.22);
            --shadow-glow-lg: 0 0 60px rgba(0, 196, 204, 0.3);
            --transition-fast: 0.18s ease;
            --transition-smooth: 0.32s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.72;
            overflow-x: hidden;
            min-height: 100vh;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-fast);
        }
        img {
            max-width: 100%;
            display: block;
        }
        /* Skip link */
        .skip-link {
            position: absolute;
            top: -100px;
            left: 20px;
            background: var(--accent);
            color: #000;
            padding: 10px 20px;
            border-radius: 0 0 8px 8px;
            z-index: 10000;
            font-size: 14px;
            font-weight: 600;
            transition: top 0.3s;
        }
        .skip-link:focus {
            top: 0;
        }

        /* Header */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(2, 8, 16, 0.85);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition-smooth);
        }
        header.scrolled {
            background: rgba(2, 8, 16, 0.96);
            box-shadow: 0 6px 28px rgba(0, 0, 0, 0.55);
        }
        .nav-container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 14px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 26px;
            font-weight: 800;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.6px;
            white-space: nowrap;
        }
        .logo .logo-icon {
            width: 34px;
            height: 34px;
            flex-shrink: 0;
        }
        .logo .logo-icon .bolt {
            fill: none;
            stroke: var(--accent-2);
            stroke-width: 2.8;
            stroke-linecap: round;
            stroke-linejoin: round;
        }
        .logo .logo-icon .circle-ring {
            fill: none;
            stroke: var(--accent);
            stroke-width: 2.2;
            stroke-linecap: round;
        }
        .logo span {
            color: var(--accent);
        }
        nav {
            display: flex;
            gap: 34px;
            align-items: center;
        }
        nav a {
            font-size: 14.5px;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 5px 0;
            letter-spacing: 0.2px;
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
            transition: width var(--transition-smooth);
        }
        nav a:hover,
        nav a.active {
            color: var(--text-primary);
        }
        nav a:hover::after,
        nav a.active::after {
            width: 100%;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .btn-login {
            background: var(--accent);
            color: #000;
            padding: 10px 26px;
            border-radius: var(--radius-full);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            letter-spacing: 0.3px;
            transition: var(--transition-smooth);
        }
        .btn-login:hover {
            box-shadow: var(--shadow-glow-lg);
            transform: translateY(-2px);
            background: #00d9e0;
        }
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            z-index: 1001;
        }
        .menu-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            margin: 6px 0;
            border-radius: 2px;
            transition: var(--transition-smooth);
        }

        /* Hero */
        .hero {
            padding: 160px 24px 80px;
            max-width: 1240px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            position: relative;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 50%;
            transform: translateX(-50%);
            width: 700px;
            height: 700px;
            background: radial-gradient(circle at center, rgba(0, 196, 204, 0.07) 0%, rgba(0, 224, 184, 0.03) 35%, transparent 70%);
            pointer-events: none;
            z-index: 0;
            border-radius: 50%;
            animation: heroGlow 6s ease-in-out infinite;
        }
        @keyframes heroGlow {
            0%,
            100% {
                opacity: 0.7;
                transform: translateX(-50%) scale(1);
            }
            50% {
                opacity: 1;
                transform: translateX(-50%) scale(1.12);
            }
        }
        .hero>* {
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 196, 204, 0.1);
            border: 1px solid var(--border-glow);
            padding: 8px 20px;
            border-radius: var(--radius-full);
            font-size: 13px;
            color: var(--accent);
            font-weight: 500;
            margin-bottom: 28px;
            animation: pulseBadge 3s ease-in-out infinite;
            letter-spacing: 0.4px;
        }
        @keyframes pulseBadge {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(0, 196, 204, 0.3);
            }
            50% {
                box-shadow: 0 0 0 16px rgba(0, 196, 204, 0);
            }
        }
        .hero-badge .dot {
            width: 9px;
            height: 9px;
            background: #00e0b8;
            border-radius: 50%;
            animation: blinkDot 2s ease-in-out infinite;
        }
        @keyframes blinkDot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.25;
            }
        }
        .hero h1 {
            font-size: clamp(34px, 5.5vw, 60px);
            font-weight: 800;
            letter-spacing: -1.4px;
            margin-bottom: 20px;
            line-height: 1.14;
            max-width: 860px;
            background: linear-gradient(175deg, #ffffff 0%, #c8eef5 55%, #a0e8f0 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent) 0%, #00e8c8 50%, var(--accent-2) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 760px;
            margin-bottom: 38px;
            line-height: 1.8;
        }
        .hero-btns {
            display: flex;
            gap: 18px;
            margin-bottom: 50px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .btn-primary {
            background: var(--accent);
            color: #000;
            padding: 15px 38px;
            border-radius: var(--radius-full);
            font-size: 16px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition-smooth);
            letter-spacing: 0.3px;
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 36px rgba(0, 196, 204, 0.45);
            background: #00d9e0;
        }
        .btn-outline {
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.25);
            padding: 15px 38px;
            border-radius: var(--radius-full);
            font-size: 16px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition-smooth);
            color: var(--text-primary);
            cursor: pointer;
        }
        .btn-outline:hover {
            border-color: var(--accent);
            background: rgba(0, 196, 204, 0.06);
            transform: translateY(-3px);
            box-shadow: 0 8px 28px rgba(0, 196, 204, 0.12);
        }
        .btn-icon-arrow {
            display: inline-block;
            transition: transform var(--transition-fast);
        }
        .btn-primary:hover .btn-icon-arrow,
        .btn-outline:hover .btn-icon-arrow {
            transform: translateX(3px);
        }

        /* Banner visual */
        .media-container {
            width: 100%;
            max-width: 1020px;
            margin: 0 auto;
        }
        .banner-visual {
            width: 100%;
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-glow);
            background: linear-gradient(150deg, rgba(9, 20, 32, 1) 0%, rgba(2, 8, 16, 1) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            transition: var(--transition-smooth);
            position: relative;
        }
        .banner-visual:hover {
            border-color: rgba(0, 196, 204, 0.5);
            box-shadow: 0 0 50px rgba(0, 196, 204, 0.1);
        }
        .banner-visual svg {
            width: 100%;
            height: auto;
            display: block;
        }

        /* Stats bar */
        .stats-bar {
            width: 100%;
            background: rgba(9, 20, 32, 0.5);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
            padding: 38px 24px;
            margin-bottom: 80px;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }
        .stats-container {
            max-width: 1240px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            text-align: center;
            gap: 22px;
        }
        .stat-item h3 {
            font-size: 40px;
            font-weight: 700;
            background: linear-gradient(135deg, #fff 0%, #a0e8f0 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.5px;
        }
        .stat-item p {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 6px;
            letter-spacing: 0.3px;
        }

        /* Sections */
        .section {
            max-width: 1240px;
            margin: 0 auto 100px;
            padding: 0 24px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 2.5px;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            background: rgba(0, 196, 204, 0.08);
            padding: 5px 15px;
            border-radius: var(--radius-full);
        }
        .section-title {
            font-size: clamp(28px, 4vw, 42px);
            font-weight: 800;
            margin-bottom: 16px;
            line-height: 1.3;
            letter-spacing: -0.7px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.75;
        }

        /* Grids */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        /* Stagger block */
        .stagger-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
            margin-bottom: 70px;
        }
        .stagger-block.reverse {
            direction: rtl;
        }
        .stagger-block.reverse .stagger-text {
            direction: ltr;
        }
        .stagger-text h3 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
            line-height: 1.3;
        }
        .stagger-text p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .stagger-text .highlight-inline {
            color: var(--accent);
            font-weight: 600;
        }
        .stagger-visual {
            background: rgba(9, 20, 32, 0.5);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition-smooth);
            min-height: 280px;
        }
        .stagger-visual:hover {
            border-color: var(--border-glow);
            box-shadow: 0 0 34px rgba(0, 196, 204, 0.07);
            transform: translateY(-2px);
        }

        /* Feature card */
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 34px 28px;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--accent), var(--accent-2), transparent);
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }
        .feature-card:hover {
            border-color: var(--border-glow);
            background: var(--bg-card-hover);
            transform: translateY(-5px);
            box-shadow: var(--shadow-card);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(0, 196, 204, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            font-size: 22px;
        }
        .feature-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            letter-spacing: -0.2px;
        }
        .feature-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* Node mesh visual */
        .node-mesh-panel {
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 44px 32px;
            background: rgba(9, 20, 32, 0.4);
            text-align: center;
        }
        .mesh-row {
            display: flex;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 16px;
        }
        .mesh-row:last-child {
            margin-bottom: 0;
        }
        .node-tag {
            background: rgba(0, 196, 204, 0.08);
            padding: 9px 18px;
            border-radius: var(--radius-full);
            font-weight: 500;
            font-size: 13px;
            color: var(--text-secondary);
            border: 1px solid transparent;
            transition: var(--transition-fast);
            letter-spacing: 0.3px;
        }
        .node-tag:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(0, 196, 204, 0.14);
        }
        .node-tag.hot {
            background: rgba(0, 224, 184, 0.12);
            color: var(--accent-2);
            font-weight: 600;
        }

        /* Step list */
        .step-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            position: relative;
            padding: 30px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-subtle);
            transition: var(--transition-smooth);
        }
        .step-item:hover {
            border-color: var(--border-glow);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), #00a8b0);
            color: #000;
            font-weight: 800;
            font-size: 20px;
            margin-bottom: 16px;
        }
        .step-item h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 13.5px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(145deg, rgba(9, 20, 32, 0.9) 0%, rgba(0, 196, 204, 0.06) 40%, rgba(0, 224, 184, 0.04) 60%, rgba(2, 8, 16, 0.9) 100%);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 60px 40px;
            text-align: center;
            margin: 0 24px 90px;
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(0, 196, 204, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 14px;
            letter-spacing: -0.6px;
            position: relative;
            z-index: 1;
        }
        .cta-section p {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 28px;
            position: relative;
            z-index: 1;
        }
        .cta-section .btn-primary {
            position: relative;
            z-index: 1;
            font-size: 17px;
            padding: 16px 44px;
        }

        /* Footer */
        footer {
            background: #01060e;
            padding: 56px 24px 32px;
            border-top: 1px solid rgba(0, 196, 204, 0.05);
            font-size: 14px;
            color: var(--text-muted);
        }
        .footer-container {
            max-width: 1240px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            margin-bottom: 36px;
            gap: 40px;
            flex-wrap: wrap;
        }
        .footer-info .footer-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.4px;
        }
        .footer-info .footer-logo span {
            color: var(--accent);
        }
        .footer-info p {
            margin-top: 10px;
            max-width: 300px;
            font-size: 13px;
            line-height: 1.7;
        }
        .footer-links {
            display: flex;
            gap: 60px;
            flex-wrap: wrap;
        }
        .footer-column h4 {
            color: var(--text-primary);
            margin-bottom: 16px;
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .footer-column ul {
            list-style: none;
        }
        .footer-column li {
            margin-bottom: 9px;
        }
        .footer-column a {
            color: var(--text-muted);
            font-size: 13px;
            transition: var(--transition-fast);
        }
        .footer-column a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            max-width: 1240px;
            margin: 0 auto;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.03);
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 12px;
            color: var(--text-muted);
        }

        /* Responsive */
        @media (max-width: 968px) {
            .grid-2,
            .stagger-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .stagger-block.reverse {
                direction: ltr;
            }
            .hero {
                padding: 130px 20px 60px;
            }
            .hero h1 {
                font-size: 30px;
            }
            .stats-container {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3,
            .step-list {
                grid-template-columns: 1fr 1fr;
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-container {
                flex-direction: column;
            }
            .footer-links {
                gap: 30px;
            }
            nav {
                display: none;
                position: fixed;
                top: 0;
                right: 0;
                width: 270px;
                height: 100vh;
                background: rgba(2, 8, 16, 0.97);
                flex-direction: column;
                padding: 80px 30px 30px;
                gap: 24px;
                border-left: 1px solid var(--border-subtle);
                z-index: 999;
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
            }
            nav.open {
                display: flex;
            }
            .menu-toggle {
                display: block;
            }
            .nav-right .btn-login {
                display: none;
            }
            .nav-right .btn-login.mobile-visible {
                display: inline-flex;
                position: fixed;
                bottom: 30px;
                right: 30px;
                z-index: 1002;
                box-shadow: var(--shadow-glow-lg);
            }
        }
        @media (max-width: 540px) {
            .grid-3,
            .step-list {
                grid-template-columns: 1fr;
            }
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .stats-container {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-item h3 {
                font-size: 28px;
            }
            .hero-btns {
                flex-direction: column;
                align-items: center;
                gap: 12px;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
                justify-content: center;
                text-align: center;
            }
        }