:root {
            --primary: #0066cc;
            --primary-bright: #1a7dff;
            --primary-deep: #004d99;
            --primary-soft: #e8f3ff;
            --accent: #00a8b5;
            --accent-soft: #e0f7f9;
            --navy-deep: #060f1e;
            --navy: #0b1a30;
            --navy-mid: #0f2240;
            --text-primary: #0f172a;
            --text-secondary: #334155;
            --text-muted: #5f6b7a;
            --bg-white: #ffffff;
            --bg-slate: #f7f9fb;
            --border: #dde4ed;
            --border-light: #e8edf4;
            --shadow-sm: 0 1px 4px rgba(0,0,0,0.05);
            --shadow-md: 0 6px 22px rgba(0,0,0,0.06);
            --shadow-lg: 0 14px 40px rgba(0,0,0,0.08);
            --radius-xs: 6px;
            --radius-sm: 10px;
            --radius: 16px;
            --radius-lg: 22px;
            --radius-xl: 30px;
            --transition: 0.2s cubic-bezier(0.4,0,0.2,1);
            --transition-slow: 0.35s cubic-bezier(0.4,0,0.2,1);
            --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
        }
        *{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth}
        body{font-family:var(--font-sans);color:var(--text-primary);background:var(--bg-white);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
        a{text-decoration:none;color:inherit}
        .container{max-width:1180px;margin:0 auto;padding:0 28px}

        /* HEADER 与首页完全一致 */
        .header{position:absolute;top:0;left:0;right:0;height:84px;display:flex;align-items:center;z-index:100;background:transparent;transition:background var(--transition),box-shadow var(--transition)}
        .header.scrolled{background:rgba(255,255,255,0.94);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:var(--shadow-sm);position:fixed}
        .header-inner{display:flex;justify-content:space-between;align-items:center;width:100%;gap:32px}
        .logo-area{display:flex;align-items:center;gap:10px;flex-shrink:0}
        .logo-icon{width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,#0066cc,#00a8b5);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900;font-size:16px;box-shadow:0 2px 10px rgba(0,102,204,0.25)}
        .logo-text{font-size:20px;font-weight:800;color:#0b1a30;letter-spacing:-0.3px;white-space:nowrap}
        .logo-text .logo-accent{color:#0066cc}
        .nav-list{display:flex;list-style:none;gap:6px;flex-wrap:wrap;justify-content:center}
        .nav-item{font-size:14px;font-weight:600;color:var(--text-primary);padding:8px 15px;border-radius:20px;transition:all var(--transition);white-space:nowrap}
        .nav-item:hover{color:#0066cc;background:rgba(0,102,204,0.05)}
        .nav-item.nav-cta{background:#0066cc;color:#fff;font-weight:700;padding:10px 20px;border-radius:22px;margin-left:2px;box-shadow:0 2px 10px rgba(0,102,204,0.22)}
        .nav-item.nav-cta:hover{background:#004d99;box-shadow:0 4px 16px rgba(0,102,204,0.32);transform:translateY(-1px)}
        .mobile-menu-btn{display:none;background:none;border:none;cursor:pointer;padding:8px}
        .mobile-menu-btn span{display:block;width:24px;height:2.5px;background:#0b1a30;border-radius:2px;margin:5px 0;transition:all var(--transition)}

        /* PAGE HERO */
        .page-hero{padding:160px 0 70px;background:linear-gradient(155deg,#f0f6fc 0%,#e4eef8 25%,#f5f8fb 55%,#eaf3fa 100%);text-align:center;position:relative;overflow:hidden}
        .page-hero::before{content:'';position:absolute;width:500px;height:500px;background:radial-gradient(circle at 52% 44%,rgba(0,102,204,0.07) 0%,transparent 66%);top:-110px;right:-120px;border-radius:50%;z-index:0;pointer-events:none}
        .hero-content{position:relative;z-index:1}
        .section-tag{display:inline-block;font-size:12.5px;font-weight:700;color:#0066cc;background:rgba(0,102,204,0.06);padding:6px 15px;border-radius:18px;margin-bottom:14px;letter-spacing:0.4px;text-transform:uppercase}
        .page-hero h1{font-size:40px;font-weight:850;color:#060f1e;margin-bottom:14px;letter-spacing:-0.5px}
        .page-hero .subtitle{font-size:16px;color:var(--text-secondary);max-width:640px;margin:0 auto 28px;line-height:1.7}

        /* SECTION COMMON */
        .section{padding:70px 0}
        .section-alt{background:var(--bg-slate)}
        .section-title{font-size:28px;font-weight:800;color:#060f1e;text-align:center;margin-bottom:8px}
        .section-desc{text-align:center;color:var(--text-muted);max-width:600px;margin:0 auto 30px}

        /* 安全特性卡片网格 */
        .security-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-top:30px}
        .sec-card{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius);padding:30px 20px;text-align:center;transition:all var(--transition-slow);cursor:default}
        .sec-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:transparent}
        .sec-icon{font-size:42px;margin-bottom:14px}
        .sec-card h3{font-size:17px;font-weight:750;color:#060f1e;margin-bottom:8px}
        .sec-card p{font-size:13.5px;color:var(--text-muted);line-height:1.6}

        /* 双栏内容 (Kill Switch / DNS) */
        .two-col{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
        .two-col-text h3{font-size:24px;font-weight:750;color:#060f1e;margin-bottom:14px}
        .two-col-text p{font-size:15px;color:var(--text-secondary);margin-bottom:12px;line-height:1.7}
        .two-col-visual{background:linear-gradient(145deg,#f0f5fa,#e6eef7);border-radius:var(--radius-xl);padding:32px 24px;display:flex;flex-direction:column;gap:14px;border:1px solid var(--border-light);min-height:240px;justify-content:center}
        .visual-bar{display:flex;align-items:center;gap:10px;background:#fff;padding:12px 16px;border-radius:var(--radius-xs);font-size:13px;font-weight:600;color:#060f1e;box-shadow:var(--shadow-sm)}

        /* 无日志政策卡片 */
        .policy-card{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:40px 32px;max-width:800px;margin:30px auto 0;text-align:center;box-shadow:var(--shadow-xs)}
        .policy-card .policy-icon{font-size:48px;margin-bottom:16px}
        .policy-card h3{font-size:22px;font-weight:800;color:#060f1e;margin-bottom:10px}
        .policy-card p{color:var(--text-secondary);line-height:1.7;margin-bottom:12px}

        /* 风险环境卡片 */
        .risk-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px;margin-top:30px}
        .risk-card{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius);padding:28px 22px;transition:all var(--transition);cursor:default}
        .risk-card:hover{box-shadow:var(--shadow-md);border-color:transparent;transform:translateY(-3px)}
        .risk-card .risk-icon{font-size:34px;margin-bottom:10px}
        .risk-card h4{font-size:16px;font-weight:700;color:#060f1e;margin-bottom:6px}
        .risk-card p{font-size:13px;color:var(--text-muted);line-height:1.6}

        /* 开发者卡片 */
        .dev-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px;margin-top:28px}
        .dev-item{background:#fff;padding:24px 16px;text-align:center;border-radius:var(--radius);border:1px solid var(--border-light);transition:all var(--transition)}
        .dev-item:hover{box-shadow:var(--shadow-sm);border-color:#0066cc40}
        .dev-item .dev-icon{font-size:30px;margin-bottom:8px}
        .dev-item h4{font-size:15px;font-weight:700;color:#060f1e;margin-bottom:4px}
        .dev-item p{font-size:12px;color:var(--text-muted)}

        /* FAQ */
        .faq-list{max-width:760px;margin:30px auto 0;display:flex;flex-direction:column;gap:12px}
        .faq-item{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius-sm);padding:20px 24px;transition:all var(--transition);cursor:pointer}
        .faq-item:hover{border-color:#0066cc40;box-shadow:var(--shadow-sm)}
        .faq-item h3{font-size:15px;font-weight:700;color:#060f1e;margin-bottom:6px}
        .faq-item p{font-size:13.5px;color:var(--text-muted);line-height:1.6}

        /* CTA */
        .cta-dark{padding:60px 0;background:linear-gradient(145deg,#060f1e 0%,#0b1a30 40%,#0f2240 100%);color:#fff;text-align:center}
        .cta-dark h2{font-size:28px;font-weight:800;margin-bottom:14px}
        .cta-dark p{color:#94a3b8;max-width:520px;margin:0 auto 28px}
        .btn-light{display:inline-flex;align-items:center;gap:6px;padding:14px 38px;font-size:15px;font-weight:700;background:#fff;color:#0066cc;border-radius:26px;transition:all var(--transition);text-decoration:none}
        .btn-light:hover{background:#e8f3ff;transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,255,255,0.15)}

        /* FOOTER */
        .footer{padding:40px 0;background:#060f1e;border-top:1px solid #1a2d44;color:#64748b;font-size:13px}
        .footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:18px}
        .footer-links{display:flex;gap:20px;flex-wrap:wrap}
        .footer-links a{color:#94a3b8;font-weight:500;font-size:12.5px;transition:color var(--transition)}
        .footer-links a:hover{color:#cbd5e1}
        .footer-copy{font-size:12px;color:#556577}

        @media(max-width:1100px){
            .header{position:relative;height:auto;padding:14px 0;background:#fff;border-bottom:1px solid var(--border-light)}
            .header-inner{flex-direction:row;flex-wrap:wrap;gap:10px;justify-content:space-between}
            .mobile-menu-btn{display:block}
            .nav-list{display:none;flex-direction:column;width:100%;gap:2px;padding-top:8px}
            .nav-list.open{display:flex}
            .nav-item{font-size:13px;padding:10px 14px;width:100%;text-align:center;border-radius:8px}
            .nav-item.nav-cta{margin-left:0;margin-top:6px}
            .page-hero{padding:60px 0 50px}
            .page-hero h1{font-size:30px}
            .two-col{grid-template-columns:1fr}
        }
        @media(max-width:640px){
            .page-hero h1{font-size:26px}
            .two-col-text h3{font-size:22px}
        }