*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box
        }
        :root {
            --bg: #060b14;
            --ink: #e6ecf3;
            --muted: #7b8ba6;
            --primary: #2563eb;
            --primary-bright: #3b82f6;
            --accent: #06b6d4;
            --success: #10b981;
            --warning: #f59e0b;
            --rose: #f43f5e;
            --glass: rgba(255, 255, 255, .025);
            --glass-hover: rgba(255, 255, 255, .05);
            --line: rgba(255, 255, 255, .07);
            --line-bright: rgba(255, 255, 255, .12);
            --card-hover: rgba(37, 99, 235, .06);
            --radius-sm: 8px;
            --radius: 14px;
            --radius-lg: 20px;
            --radius-xl: 24px;
            --ease: cubic-bezier(.22, 1, .36, 1);
            --font-display: 'Syne', sans-serif;
            --font-body: 'Space Grotesk', sans-serif;
            --font-mono: 'DM Mono', monospace;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            overflow-x: hidden;
            -webkit-text-size-adjust: 100%
        }
        body {
            font-family: var(--font-body);
            background: var(--bg);
            color: var(--ink);
            overflow-x: hidden;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale
        }
        ::selection {
            background: var(--primary-bright);
            color: #fff
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all .3s var(--ease)
        }
        ul {
            list-style: none
        }
        .container {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 clamp(20px, 4vw, 60px)
        }
        h1,
        h2,
        h3,
        h4 {
            font-family: var(--font-display);
            font-weight: 800;
            letter-spacing: -.02em
        }
        body::before {
            content: '';
            position: fixed;
            inset: 0;
            z-index: 0;
            pointer-events: none;
            background: radial-gradient(ellipse 70% 50% at 15% 85%, rgba(37, 99, 235, .05), transparent),
                radial-gradient(ellipse 55% 45% at 85% 15%, rgba(6, 182, 212, .04), transparent),
                radial-gradient(ellipse 40% 35% at 50% 50%, rgba(16, 185, 129, .02), transparent)
        }

        /* 导航栏（与首页一致） */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            backdrop-filter: blur(20px) saturate(1.4);
            -webkit-backdrop-filter: blur(20px) saturate(1.4);
            border-bottom: 1px solid var(--line);
            background: rgba(6, 11, 20, .7)
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 60px
        }
        .logo {
            font-family: var(--font-display);
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: .05em;
            background: linear-gradient(135deg, #3b82f6, #06b6d4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            flex-shrink: 0
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 26px
        }
        .nav-right a {
            font-size: .8rem;
            font-weight: 500;
            color: var(--muted);
            position: relative;
            letter-spacing: .02em;
            white-space: nowrap
        }
        .nav-right a:hover {
            color: var(--ink)
        }
        .nav-right a.active {
            color: var(--accent)
        }
        .nav-download {
            padding: 8px 18px;
            border-radius: 6px;
            border: 1px solid rgba(59, 130, 246, .35);
            color: #3b82f6 !important;
            font-weight: 600;
            font-size: .8rem;
            transition: all .3s ease;
            white-space: nowrap
        }
        .nav-download:hover {
            background: rgba(59, 130, 246, .1);
            box-shadow: 0 0 20px rgba(59, 130, 246, .12)
        }
        .mobile-btn {
            display: none;
            background: none;
            border: none;
            color: var(--ink);
            font-size: 1.4rem;
            cursor: pointer;
            padding: 4px
        }

        /* 面包屑 */
        .breadcrumb {
            position: relative;
            z-index: 1;
            padding: 84px 0 0;
            font-family: var(--font-mono);
            font-size: .78rem;
            color: var(--muted)
        }
        .breadcrumb a {
            color: var(--muted)
        }
        .breadcrumb a:hover {
            color: var(--accent)
        }
        .breadcrumb .sep {
            margin: 0 8px;
            opacity: .4
        }

        /* Hero区域 */
        .sec-hero {
            position: relative;
            z-index: 1;
            padding: clamp(40px, 6vh, 72px) 0 clamp(60px, 10vh, 100px)
        }
        .sec-hero-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: clamp(40px, 6vw, 80px);
            align-items: center
        }
        .sec-hero-text .overline {
            font-family: var(--font-mono);
            font-size: .75rem;
            font-weight: 400;
            color: var(--success);
            letter-spacing: .2em;
            text-transform: uppercase;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 12px
        }
        .sec-hero-text .overline::before {
            content: '';
            width: 28px;
            height: 1px;
            background: var(--success)
        }
        .sec-hero-text h1 {
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            line-height: 1.05;
            margin-bottom: 20px
        }
        .sec-hero-text h1 .grad {
            background: linear-gradient(90deg, #10b981, #3b82f6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text
        }
        .sec-hero-text p {
            color: var(--muted);
            font-size: 1rem;
            max-width: 450px;
            line-height: 1.8;
            margin-bottom: 32px
        }
        .hero-badges {
            display: flex;
            gap: 16px;
            flex-wrap: wrap
        }
        .hero-badge {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 20px;
            border-radius: 10px;
            border: 1px solid var(--line);
            background: var(--glass);
            font-family: var(--font-mono);
            font-size: .78rem;
            color: var(--muted);
            transition: all .3s ease
        }
        .hero-badge:hover {
            border-color: rgba(16, 185, 129, .25);
            background: rgba(16, 185, 129, .03)
        }
        .hero-badge .bdot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--success);
            box-shadow: 0 0 8px var(--success)
        }
        .sec-hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center
        }
        .encrypt-visual {
            position: relative;
            width: 100%;
            max-width: 400px;
            aspect-ratio: 1/1;
            display: flex;
            align-items: center;
            justify-content: center
        }
        .encrypt-ring {
            position: absolute;
            border-radius: 50%;
            border: 1px solid rgba(16, 185, 129, .15);
            animation: ringPulse 4s ease-in-out infinite
        }
        .encrypt-ring:nth-child(1) {
            width: 80%;
            height: 80%;
            animation-delay: 0s
        }
        .encrypt-ring:nth-child(2) {
            width: 60%;
            height: 60%;
            animation-delay: .5s;
            border-color: rgba(59, 130, 246, .15)
        }
        .encrypt-ring:nth-child(3) {
            width: 40%;
            height: 40%;
            animation-delay: 1s;
            border-color: rgba(6, 182, 212, .15)
        }
        @keyframes ringPulse {
            0%,
            100% {
                transform: scale(1);
                opacity: .6
            }
            50% {
                transform: scale(1.04);
                opacity: 1
            }
        }
        .encrypt-icon {
            position: relative;
            z-index: 1;
            font-size: 3.5rem;
            filter: drop-shadow(0 0 20px rgba(16, 185, 129, .3))
        }

        /* 通用区块 */
        .section {
            position: relative;
            z-index: 1;
            padding: clamp(60px, 8vh, 100px) 0
        }
        .section-head {
            text-align: center;
            margin-bottom: clamp(40px, 5vw, 60px)
        }
        .section-head .tag {
            display: inline-block;
            font-family: var(--font-mono);
            font-size: .7rem;
            letter-spacing: .14em;
            text-transform: uppercase;
            color: var(--success);
            padding: 6px 14px;
            border-radius: 4px;
            border: 1px solid rgba(16, 185, 129, .2);
            margin-bottom: 14px
        }
        .section-head h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            line-height: 1.15;
            margin-bottom: 10px
        }
        .section-head .sub {
            color: var(--muted);
            font-size: .9rem;
            max-width: 500px;
            margin: 0 auto;
            line-height: 1.7
        }

        /* 安全特性网格 */
        .security-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px
        }
        .sec-card {
            border-radius: var(--radius-lg);
            border: 1px solid var(--line);
            background: var(--glass);
            padding: clamp(26px, 3vw, 38px);
            text-align: center;
            transition: all .4s var(--ease);
            position: relative;
            overflow: hidden
        }
        .sec-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, #10b981, #3b82f6);
            opacity: 0;
            transition: opacity .4s ease
        }
        .sec-card:hover {
            transform: translateY(-6px);
            border-color: var(--line-bright);
            box-shadow: 0 20px 48px rgba(0, 0, 0, .35)
        }
        .sec-card:hover::before {
            opacity: 1
        }
        .sec-icon {
            font-size: 2rem;
            margin-bottom: 16px;
            display: block
        }
        .sec-card h3 {
            font-size: 1.1rem;
            margin-bottom: 10px
        }
        .sec-card p {
            font-size: .85rem;
            color: var(--muted);
            line-height: 1.7
        }

        /* 优化机制——动态路径对比 */
        .opt-compare {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            gap: 16px;
            align-items: center;
            max-width: 900px;
            margin: 0 auto
        }
        .opt-panel {
            border-radius: var(--radius-lg);
            border: 1px solid var(--line);
            background: var(--glass);
            padding: clamp(24px, 3vw, 36px);
            text-align: center
        }
        .opt-panel h4 {
            font-size: .95rem;
            margin-bottom: 14px;
            font-family: var(--font-body);
            font-weight: 600;
            letter-spacing: 0
        }
        .opt-path {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            flex-wrap: wrap;
            margin: 16px 0
        }
        .opt-node {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: .75rem;
            border: 1px solid rgba(255, 255, 255, .1)
        }
        .opt-node.user {
            background: rgba(37, 99, 235, .1);
            border-color: rgba(37, 99, 235, .2);
            color: #3b82f6
        }
        .opt-node.relay {
            background: rgba(245, 158, 11, .1);
            border-color: rgba(245, 158, 11, .2);
            color: #f59e0b
        }
        .opt-node.target {
            background: rgba(16, 185, 129, .1);
            border-color: rgba(16, 185, 129, .2);
            color: #10b981
        }
        .opt-line {
            width: 20px;
            height: 2px;
            background: var(--line);
            flex-shrink: 0
        }
        .opt-line.active {
            background: #10b981
        }
        .opt-metric {
            font-family: var(--font-mono);
            font-size: .8rem;
            color: var(--muted);
            margin-top: 10px
        }
        .opt-metric span {
            color: var(--ink);
            font-weight: 600
        }
        .opt-vs {
            font-family: var(--font-display);
            font-size: 2rem;
            color: var(--muted);
            font-weight: 800
        }

        /* 场景卡片 */
        .scene-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px
        }
        .scene-item {
            border-radius: var(--radius);
            border: 1px solid var(--line);
            background: var(--glass);
            padding: 22px 18px;
            text-align: center;
            transition: all .3s ease
        }
        .scene-item:hover {
            border-color: var(--line-bright);
            background: var(--glass-hover);
            transform: translateY(-3px)
        }
        .scene-emoji {
            font-size: 1.8rem;
            margin-bottom: 10px;
            display: block
        }
        .scene-item h4 {
            font-size: .9rem;
            margin-bottom: 6px;
            font-family: var(--font-body);
            font-weight: 600;
            letter-spacing: 0
        }
        .scene-item p {
            font-size: .78rem;
            color: var(--muted);
            line-height: 1.6
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
            max-width: 900px;
            margin: 0 auto
        }
        .faq-card {
            border-radius: var(--radius);
            border: 1px solid var(--line);
            background: var(--glass);
            padding: 20px 22px;
            transition: all .3s ease
        }
        .faq-card:hover {
            border-color: var(--line-bright);
            background: var(--glass-hover)
        }
        .faq-card h3 {
            font-size: .9rem;
            margin-bottom: 8px;
            font-family: var(--font-body);
            font-weight: 600;
            letter-spacing: 0
        }
        .faq-card p {
            font-size: .8rem;
            color: var(--muted);
            line-height: 1.7
        }

        /* CTA */
        .cta-inner {
            position: relative;
            border-radius: var(--radius-xl);
            border: 1px solid var(--line);
            padding: clamp(50px, 7vw, 80px);
            text-align: center;
            overflow: hidden;
            background: var(--glass)
        }
        .cta-inner::before {
            content: '';
            position: absolute;
            top: -160px;
            left: 50%;
            width: 500px;
            height: 500px;
            transform: translateX(-50%);
            background: radial-gradient(circle, rgba(16, 185, 129, .05), transparent 55%);
            pointer-events: none
        }
        .cta-inner h2 {
            font-size: clamp(1.8rem, 4vw, 2.6rem);
            line-height: 1.1;
            margin-bottom: 14px;
            position: relative;
            z-index: 1
        }
        .cta-inner p {
            color: var(--muted);
            font-size: .95rem;
            margin-bottom: 32px;
            max-width: 450px;
            margin-left: auto;
            margin-right: auto;
            position: relative;
            z-index: 1
        }
        .cta-btns {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
            position: relative;
            z-index: 1
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 30px;
            border-radius: var(--radius-sm);
            background: #2563eb;
            color: #fff;
            font-weight: 700;
            font-size: .9rem;
            font-family: var(--font-body);
            border: none;
            cursor: pointer;
            transition: all .3s ease;
            box-shadow: 0 4px 20px rgba(37, 99, 235, .3)
        }
        .btn-primary:hover {
            background: #3b82f6;
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(37, 99, 235, .4)
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 30px;
            border-radius: var(--radius-sm);
            background: transparent;
            border: 1px solid var(--line-bright);
            color: var(--ink);
            font-weight: 600;
            font-size: .9rem;
            font-family: var(--font-body);
            cursor: pointer;
            transition: all .3s ease
        }
        .btn-ghost:hover {
            border-color: rgba(255, 255, 255, .2);
            background: var(--glass-hover);
            transform: translateY(-2px)
        }

        /* 页脚 */
        .footer {
            position: relative;
            z-index: 1;
            border-top: 1px solid var(--line);
            padding: 50px 0 24px
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2.5fr 1fr 1fr 1fr;
            gap: clamp(20px, 3.5vw, 48px);
            margin-bottom: 36px
        }
        .footer-brand p {
            color: var(--muted);
            font-size: .84rem;
            max-width: 260px;
            line-height: 1.7;
            margin-top: 12px
        }
        .footer-col h4 {
            font-family: var(--font-mono);
            font-size: .72rem;
            font-weight: 500;
            color: var(--ink);
            margin-bottom: 16px;
            letter-spacing: .1em;
            text-transform: uppercase
        }
        .footer-col li {
            margin-bottom: 9px
        }
        .footer-col a {
            color: var(--muted);
            font-size: .84rem;
            transition: all .3s var(--ease)
        }
        .footer-col a:hover {
            color: #3b82f6;
            padding-left: 3px
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, .04);
            font-size: .74rem;
            color: var(--muted);
            font-family: var(--font-mono)
        }

        /* 动画 */
        .reveal {
            opacity: 0;
            transform: translateY(36px);
            transition: all .7s var(--ease)
        }
        .reveal.show {
            opacity: 1;
            transform: translateY(0)
        }
        .reveal-d1 {
            transition-delay: .1s
        }
        .reveal-d2 {
            transition-delay: .2s
        }
        .reveal-d3 {
            transition-delay: .3s
        }
        .reveal-d4 {
            transition-delay: .4s
        }

        @media(max-width:1024px) {
            .sec-hero-inner {
                grid-template-columns: 1fr
            }
            .encrypt-visual {
                max-width: 280px;
                margin: 0 auto
            }
            .security-grid {
                grid-template-columns: 1fr 1fr
            }
            .opt-compare {
                grid-template-columns: 1fr;
                gap: 24px
            }
            .opt-vs {
                transform: rotate(90deg)
            }
            .scene-row {
                grid-template-columns: 1fr 1fr
            }
            .faq-grid {
                grid-template-columns: 1fr
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr
            }
        }
        @media(max-width:768px) {
            .nav-right a:not(.nav-download) {
                display: none
            }
            .mobile-btn {
                display: block
            }
            .security-grid {
                grid-template-columns: 1fr
            }
            .scene-row {
                grid-template-columns: 1fr
            }
            .footer-grid {
                grid-template-columns: 1fr
            }
            .footer-bottom {
                flex-direction: column;
                gap: 6px;
                text-align: center
            }
            .hero-badges {
                flex-direction: column
            }
        }