:root {
            --bg-dark: #070f1e;
            --bg-card: #0d1b2a;
            --bg-card-hover: #101d30;
            --accent: #1883ff;
            --accent-glow: rgba(24, 131, 255, 0.35);
            --accent-green: #00b4d8;
            --text-main: #ffffff;
            --text-muted: #8da9c4;
            --text-dim: #6b8399;
            --border-subtle: rgba(24, 131, 255, 0.1);
            --border-glow: rgba(24, 131, 255, 0.25);
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 50px;
            --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 28px rgba(24, 131, 255, 0.25);
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-fast);
        }
        ul {
            list-style: none;
        }

        /* Header (与首页一致) */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(7, 15, 30, 0.88);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition-smooth);
        }
        header.scrolled {
            background: rgba(7, 15, 30, 0.96);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
        }
        .nav-container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 16px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 24px;
            font-weight: 800;
            color: var(--text-main);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .logo svg {
            width: 30px;
            height: 30px;
            fill: none;
            stroke: var(--accent);
            stroke-width: 2.6;
            stroke-linecap: round;
            stroke-linejoin: round;
        }
        .logo span {
            color: var(--accent);
        }
        nav {
            display: flex;
            gap: 36px;
            align-items: center;
        }
        nav a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 4px 0;
        }
        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-main);
        }
        nav a:hover::after,
        nav a.active::after {
            width: 100%;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 18px;
        }
        .btn-login {
            background: var(--accent);
            padding: 10px 26px;
            border-radius: var(--radius-full);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: var(--transition-smooth);
            color: #fff;
        }
        .btn-login:hover {
            box-shadow: var(--shadow-glow);
            transform: translateY(-1px);
        }
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }
        .menu-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-main);
            margin: 6px 0;
            border-radius: 2px;
        }

        /* 教程 Hero */
        .guide-hero {
            padding: 170px 24px 40px;
            max-width: 1240px;
            margin: 0 auto;
            text-align: center;
            position: relative;
        }
        .guide-hero::before {
            content: '';
            position: absolute;
            top: 80px;
            left: 50%;
            transform: translateX(-50%);
            width: 550px;
            height: 550px;
            background: radial-gradient(circle at center, rgba(24, 131, 255, 0.07) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
            border-radius: 50%;
        }
        .guide-hero>* {
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 180, 216, 0.12);
            border: 1px solid rgba(0, 180, 216, 0.3);
            padding: 7px 20px;
            border-radius: var(--radius-full);
            font-size: 13px;
            color: var(--accent-green);
            font-weight: 500;
            margin-bottom: 24px;
            letter-spacing: 0.3px;
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            background: #34d399;
            border-radius: 50%;
            animation: blinkDot 2s ease-in-out infinite;
        }
        @keyframes blinkDot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.3;
            }
        }
        .guide-hero h1 {
            font-size: clamp(34px, 5vw, 52px);
            font-weight: 800;
            letter-spacing: -0.8px;
            margin-bottom: 16px;
            line-height: 1.18;
            background: linear-gradient(180deg, #ffffff 0%, #c8ddf8 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .guide-hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .guide-hero>p {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 32px;
            line-height: 1.75;
        }

        .section {
            max-width: 1240px;
            margin: 0 auto 80px;
            padding: 0 24px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 2.5px;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 10px;
            background: rgba(24, 131, 255, 0.08);
            padding: 5px 14px;
            border-radius: var(--radius-full);
        }
        .section-title {
            font-size: clamp(28px, 3.8vw, 38px);
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.6px;
            line-height: 1.3;
        }
        .section-desc {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.7;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            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;
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .feature-card:hover {
            border-color: var(--border-glow);
            background: var(--bg-card-hover);
            transform: translateY(-3px);
            box-shadow: var(--shadow-card);
        }
        .feature-card .card-icon {
            font-size: 32px;
            margin-bottom: 12px;
            display: block;
        }
        .feature-card h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.2px;
        }
        .feature-card p {
            font-size: 13.5px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .stagger-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
            margin-bottom: 70px;
        }
        .stagger-text h3 {
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 14px;
            letter-spacing: -0.4px;
            line-height: 1.3;
        }
        .stagger-text p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.8;
            margin-bottom: 14px;
        }
        .stagger-visual {
            background: rgba(13, 27, 42, 0.45);
            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);
        }
        .stagger-visual:hover {
            border-color: var(--border-glow);
            box-shadow: 0 0 30px rgba(24, 131, 255, 0.06);
        }

        /* 智能路由动画节点图 */
        .routing-svg {
            width: 100%;
            max-width: 450px;
            height: auto;
        }

        /* 场景卡片 */
        .scene-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 24px;
            transition: var(--transition-smooth);
            text-align: center;
        }
        .scene-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        .scene-emoji {
            font-size: 40px;
            margin-bottom: 10px;
        }
        .scene-card h5 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 6px;
        }
        .scene-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 视频占位 */
        .video-placeholder {
            background: #000;
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-subtle);
            padding: 80px 20px;
            text-align: center;
            color: var(--text-muted);
            transition: var(--transition-smooth);
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }
        .video-placeholder:hover {
            border-color: var(--accent);
            box-shadow: 0 0 35px rgba(24,131,255,0.15);
        }
        .play-btn {
            display: inline-block;
            width: 70px;
            height: 70px;
            background: rgba(24,131,255,0.8);
            border-radius: 50%;
            line-height: 70px;
            font-size: 28px;
            margin-bottom: 14px;
            transition: var(--transition-smooth);
        }
        .video-placeholder:hover .play-btn {
            background: var(--accent);
            transform: scale(1.05);
            box-shadow: 0 0 30px rgba(24,131,255,0.5);
        }

        /* CTA */
        .cta-section {
            max-width: 1240px;
            margin: 0 auto 80px;
            padding: 0 24px;
            text-align: center;
        }
        .cta-inner {
            background: linear-gradient(135deg, rgba(13,27,42,0.85) 0%, rgba(24,131,255,0.05) 50%, rgba(7,15,30,0.85) 100%);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 50px 36px;
            transition: var(--transition-smooth);
        }
        .cta-inner:hover {
            border-color: var(--border-glow);
            box-shadow: 0 0 40px rgba(24,131,255,0.06);
        }
        .cta-inner h2 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 10px;
        }
        .cta-inner p {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 560px;
            margin: 0 auto 24px;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            padding: 15px 38px;
            border-radius: var(--radius-full);
            font-size: 16px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition-smooth);
            letter-spacing: 0.3px;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(24,131,255,0.4);
        }

        /* Footer (与首页一致) */
        footer {
            background: #040810;
            padding: 56px 24px 36px;
            border-top: 1px solid rgba(24, 131, 255, 0.06);
            font-size: 14px;
            color: var(--text-muted);
        }
        .footer-container {
            max-width: 1240px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            margin-bottom: 40px;
            gap: 40px;
            flex-wrap: wrap;
        }
        .footer-info .footer-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-main);
            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: 70px;
            flex-wrap: wrap;
        }
        .footer-column h4 {
            color: var(--text-main);
            margin-bottom: 16px;
            font-size: 15px;
            font-weight: 600;
        }
        .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: 28px;
            border-top: 1px solid rgba(255,255,255,0.04);
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 12px;
        }

        @media (max-width: 968px) {
            .grid-2,
            .stagger-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .grid-3 {
                grid-template-columns: 1fr 1fr;
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            nav {
                display: none;
                position: fixed;
                top: 0;
                right: 0;
                width: 270px;
                height: 100vh;
                background: rgba(7,15,30,0.97);
                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);
            }
            .guide-hero h1 {
                font-size: 30px;
            }
        }
        @media (max-width: 540px) {
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .stagger-visual {
                padding: 20px;
            }
        }