/* ==================== 全局重置 & 基础 ==================== */
        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --bg-deep: #0c0a14;
            --bg-surface: #151128;
            --bg-card: #1a1533;
            --bg-card-hover: #221a42;
            --accent: #00e5c7;
            --accent-2: #7c5cff;
            --accent-glow: rgba(0, 229, 199, 0.25);
            --accent-2-glow: rgba(124, 92, 255, 0.25);
            --text-main: #ffffff;
            --text-secondary: #a89fc4;
            --text-tertiary: #6f6790;
            --border-subtle: rgba(124, 92, 255, 0.15);
            --border-glow: rgba(0, 229, 199, 0.3);
            --shadow-soft: 0 8px 40px rgba(0, 0, 0, 0.25);
            --shadow-glow: 0 0 60px rgba(0, 229, 199, 0.08);
            --radius: 14px;
            --radius-lg: 20px;
            --radius-full: 50px;
            --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --gradient-main: linear-gradient(135deg, #00e5c7 0%, #7c5cff 100%);
            --gradient-card: linear-gradient(160deg, rgba(26, 21, 51, 0.95) 0%, rgba(12, 10, 20, 0.98) 100%);
            --gradient-border: linear-gradient(135deg, rgba(0, 229, 199, 0.4), rgba(124, 92, 255, 0.4));
            --shadow-security: 0 0 40px rgba(0, 229, 199, 0.15);
            --shadow-speed: 0 0 40px rgba(124, 92, 255, 0.15);
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: var(--font);
            color: var(--text-main);
            background: var(--bg-deep);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ==================== 顶部导航（与首页一致，高亮当前页） ==================== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(12, 10, 20, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition);
        }

        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.5px;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            background: var(--gradient-main);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #0c0a14;
            font-weight: 900;
            box-shadow: 0 0 24px var(--accent-glow);
        }

        .logo span {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav a {
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 0.2px;
            transition: var(--transition);
            position: relative;
            padding: 4px 0;
        }

        .nav a:hover {
            color: var(--text-main);
        }

        .nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient-main);
            border-radius: 2px;
            transition: var(--transition);
        }

        .nav a:hover::after,
        .nav a.active::after {
            width: 100%;
        }

        .nav a.active {
            color: var(--text-main);
            font-weight: 600;
        }

        .nav .lang-btn {
            background: rgba(255, 255, 255, 0.06);
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-size: 13px;
            color: var(--text-main);
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            letter-spacing: 0.3px;
        }

        .nav .lang-btn:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--border-glow);
            box-shadow: 0 0 20px var(--accent-glow);
        }

        .nav .lang-btn::after {
            display: none;
        }

        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
        }

        .mobile-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-main);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* ==================== 页面Hero - 双特性主题 ==================== */
        .feature-hero {
            padding: 160px 0 70px;
            background: var(--bg-deep);
            position: relative;
            overflow: hidden;
            min-height: 80vh;
            display: flex;
            align-items: center;
        }

        .feature-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background:
                radial-gradient(ellipse at 20% 50%, rgba(0, 229, 199, 0.10) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 50%, rgba(124, 92, 255, 0.12) 0%, transparent 50%);
            pointer-events: none;
        }

        .feature-hero-grid {
            position: absolute;
            inset: 0;
            opacity: 0.05;
            background-image:
                linear-gradient(rgba(0, 229, 199, 0.5) 1px, transparent 1px),
                linear-gradient(90deg, rgba(124, 92, 255, 0.5) 1px, transparent 1px);
            background-size: 40px 40px;
            pointer-events: none;
            mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
            -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
        }

        .feature-hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .feature-hero-badge {
            display: inline-block;
            background: rgba(0, 229, 199, 0.10);
            color: var(--accent);
            font-size: 13px;
            font-weight: 600;
            padding: 5px 18px;
            border-radius: var(--radius-full);
            margin-bottom: 20px;
            border: 1px solid rgba(0, 229, 199, 0.22);
            letter-spacing: 0.4px;
        }

        .feature-hero h1 {
            font-size: 48px;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }

        .feature-hero h1 .highlight {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .feature-hero p.sub {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 500px;
            margin-bottom: 30px;
            line-height: 1.75;
        }

        .feature-hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 30px;
        }

        .btn-primary {
            display: inline-block;
            background: var(--gradient-main);
            color: #0c0a14;
            font-size: 16px;
            font-weight: 700;
            padding: 14px 34px;
            border-radius: var(--radius-full);
            transition: var(--transition);
            box-shadow: 0 4px 28px rgba(0, 229, 199, 0.3);
            letter-spacing: 0.4px;
            border: none;
            cursor: pointer;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 40px rgba(0, 229, 199, 0.45);
        }

        .btn-secondary {
            display: inline-block;
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-main);
            font-size: 14px;
            font-weight: 500;
            padding: 14px 28px;
            border-radius: var(--radius-full);
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            letter-spacing: 0.3px;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: var(--border-glow);
            box-shadow: 0 0 28px var(--accent-glow);
        }

        .feature-hero-stats {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
        }

        .stat-item {
            display: flex;
            flex-direction: column;
        }

        .stat-item .stat-number {
            font-size: 24px;
            font-weight: 800;
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .stat-item .stat-label {
            font-size: 13px;
            color: var(--text-tertiary);
        }

        .feature-hero-visual {
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .dual-ring {
            width: 100%;
            max-width: 400px;
            aspect-ratio: 1/1;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .ring-security {
            position: absolute;
            inset: 0;
            border-radius: 50%;
            border: 2px dashed rgba(0, 229, 199, 0.4);
            animation: rotate-ring 20s linear infinite;
        }

        .ring-speed {
            position: absolute;
            inset: 20%;
            border-radius: 50%;
            border: 2px solid rgba(124, 92, 255, 0.5);
            animation: rotate-ring-reverse 15s linear infinite;
        }

        .ring-core {
            width: 40%;
            height: 40%;
            border-radius: 50%;
            background: var(--gradient-main);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            font-weight: 900;
            color: #0c0a14;
            box-shadow: 0 0 60px rgba(0, 229, 199, 0.4);
        }

        @keyframes rotate-ring {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }
        @keyframes rotate-ring-reverse {
            from { transform: rotate(360deg); }
            to { transform: rotate(0deg); }
        }

        /* ==================== 通用标题 ==================== */
        .section-title {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-title h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: -0.8px;
            line-height: 1.25;
        }
        .section-title h2 .gradient-text {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-title p {
            color: var(--text-secondary);
            font-size: 17px;
            margin-top: 10px;
        }

        /* ==================== 安全盾牌深度版块 ==================== */
        .security-deep {
            padding: 80px 0;
            background: var(--bg-surface);
        }
        .security-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .security-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 30px 24px;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            box-shadow: var(--shadow-soft);
            position: relative;
            overflow: hidden;
        }
        .security-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--gradient-main);
            opacity: 0;
            transition: var(--transition);
        }
        .security-card:hover::before {
            opacity: 1;
        }
        .security-card:hover {
            transform: translateY(-5px);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-security);
        }
        .security-icon {
            font-size: 32px;
            margin-bottom: 14px;
        }
        .security-card h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }
        .security-card p {
            color: var(--text-tertiary);
            font-size: 14px;
            line-height: 1.7;
        }

        /* ==================== 加速引擎深度版块 ==================== */
        .speed-deep {
            padding: 80px 0;
            background: var(--bg-deep);
        }
        .speed-deep-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .speed-deep-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
            box-shadow: var(--shadow-soft);
        }
        .speed-deep-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-speed);
        }
        .speed-deep-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-main);
        }
        .speed-deep-card p {
            color: var(--text-tertiary);
            font-size: 14px;
            line-height: 1.75;
        }

        /* ==================== 一键连接模拟版块 ==================== */
        .one-click {
            padding: 80px 0;
            background: var(--bg-surface);
            position: relative;
            overflow: hidden;
        }
        .one-click::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, rgba(0, 229, 199, 0.05) 0%, transparent 60%);
            pointer-events: none;
        }
        .one-click-container {
            max-width: 600px;
            margin: 0 auto;
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .one-click-button {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            background: var(--gradient-main);
            border: none;
            cursor: pointer;
            font-size: 18px;
            font-weight: 800;
            color: #0c0a14;
            margin: 20px auto 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 60px rgba(0, 229, 199, 0.3);
            transition: var(--transition);
            animation: pulse-button 2s ease-in-out infinite;
        }
        .one-click-button:hover {
            transform: scale(1.05);
            box-shadow: 0 0 80px rgba(0, 229, 199, 0.5);
        }
        @keyframes pulse-button {
            0%, 100% { box-shadow: 0 0 30px rgba(0, 229, 199, 0.2); }
            50% { box-shadow: 0 0 70px rgba(0, 229, 199, 0.45); }
        }
        .one-click-desc {
            color: var(--text-secondary);
            font-size: 16px;
            max-width: 400px;
            margin: 0 auto;
        }

        /* ==================== 无限制承诺版块 ==================== */
        .no-limits {
            padding: 80px 0;
            background: var(--bg-deep);
        }
        .no-limits-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .limit-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px 18px;
            text-align: center;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
        }
        .limit-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }
        .limit-icon {
            font-size: 28px;
            margin-bottom: 8px;
        }
        .limit-card h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 4px;
        }
        .limit-card p {
            font-size: 13px;
            color: var(--text-tertiary);
        }

        /* ==================== 数据化结构同步区 ==================== */
        .data-structure {
            padding: 80px 0;
            background: var(--bg-surface);
        }
        .data-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .data-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px 20px;
            text-align: center;
            border: 1px solid var(--border-subtle);
            transition: var(--transition);
        }
        .data-item:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
        }
        .data-value {
            font-size: 36px;
            font-weight: 900;
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -1px;
        }
        .data-label {
            font-size: 14px;
            color: var(--text-tertiary);
            margin-top: 4px;
        }

        /* ==================== Footer 与首页一致 ==================== */
        .footer {
            background: var(--bg-deep);
            color: var(--text-secondary);
            padding: 60px 0 32px;
            border-top: 1px solid var(--border-subtle);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p {
            font-size: 13px;
            line-height: 1.8;
            max-width: 280px;
            margin-top: 10px;
            color: var(--text-tertiary);
        }
        .footer-col h5 {
            color: var(--text-main);
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 14px;
            letter-spacing: 0.2px;
        }
        .footer-col a {
            display: block;
            font-size: 13px;
            padding: 4px 0;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 12px;
            color: var(--text-tertiary);
        }

        /* ==================== 响应式 ==================== */
        @media (max-width: 1024px) {
            .feature-hero .container {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .feature-hero p.sub {
                margin-left: auto;
                margin-right: auto;
            }
            .feature-hero-actions {
                justify-content: center;
            }
            .feature-hero-stats {
                justify-content: center;
            }
            .feature-hero-visual {
                margin-top: 20px;
            }
            .dual-ring {
                max-width: 280px;
            }
            .security-grid,
            .no-limits-grid,
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .speed-deep-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .feature-hero h1 {
                font-size: 32px;
            }
            .feature-hero p.sub {
                font-size: 16px;
            }
            .feature-hero {
                padding: 130px 0 50px;
                min-height: auto;
            }
            .security-grid,
            .no-limits-grid,
            .data-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .section-title h2 {
                font-size: 26px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .btn-primary {
                padding: 12px 26px;
                font-size: 15px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .feature-hero h1 {
                font-size: 24px;
            }
            .feature-hero p.sub {
                font-size: 14px;
            }
            .feature-hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                text-align: center;
                justify-content: center;
            }
            .section-title h2 {
                font-size: 22px;
            }
            .one-click-button {
                width: 100px;
                height: 100px;
                font-size: 16px;
            }
        }