:root{
  --blue:#2980FE;
  --blue-deep:#1768E8;
  --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
  --text:#202938;
  --muted:#667085;
  --light:#F5F7FB;
  --line:#E5E9F2;
  --card:#FFFFFF;
  --soft:#EEF5FF;
  --radius:24px;
  --shadow:0 16px 42px rgba(35,58,115,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.72;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(229,233,242,.9)}
.header-inner{width:min(1180px,calc(100% - 32px));margin:0 auto;display:flex;align-items:center;justify-content:space-between;min-height:70px;gap:18px}
.logo,.footer-logo{display:flex;align-items:center;gap:10px;font-weight:800;color:#111827;letter-spacing:.2px}
.logo img{width:38px;height:38px;border-radius:12px;object-fit:cover}
.nav-toggle{width:44px;height:44px;border:1px solid var(--line);border-radius:14px;background:#fff;display:flex;flex-direction:column;gap:5px;align-items:center;justify-content:center;cursor:pointer}
.nav-toggle span{width:19px;height:2px;background:#263247;border-radius:2px}
.site-nav{position:absolute;left:16px;right:16px;top:72px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px;padding:10px;display:none;grid-template-columns:1fr;gap:4px}
.site-nav.is-open{display:grid}
.site-nav a{padding:11px 13px;border-radius:12px;color:#344054;font-size:15px}
.site-nav a.active,.site-nav a:hover{background:var(--soft);color:var(--blue)}
main{background:linear-gradient(180deg,#fff 0%,#F8FAFF 42%,#fff 100%)}
.container{width:min(1180px,calc(100% - 32px));margin:0 auto}
.section{padding:62px 0}
.section-head{max-width:760px;margin:0 0 26px}
.section-head.center{text-align:center;margin-left:auto;margin-right:auto}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-weight:700;background:#EAF3FF;border:1px solid #D7E8FF;border-radius:999px;padding:6px 12px;font-size:13px}
h1,h2,h3{line-height:1.22;margin:0 0 14px;color:#111827}
h1{font-size:36px;letter-spacing:-.8px}
h2{font-size:28px;letter-spacing:-.4px}
h3{font-size:20px}.lead{font-size:17px;color:#EEF5FF;margin:0 0 24px}.muted,p{color:var(--muted);margin:0 0 14px}.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;border-radius:999px;background:var(--blue);color:#fff!important;font-weight:800;box-shadow:0 12px 26px rgba(41,128,254,.26);transition:.2s ease;border:0}.download-btn:hover{background:var(--blue-deep);transform:translateY(-1px)}
.connection-workspace-hero{padding:34px 0 46px;background:var(--gradient);color:#fff;border-radius:0 0 34px 34px;position:relative;overflow:hidden}.connection-workspace-hero:before{content:"";position:absolute;inset:-20% -10% auto auto;width:420px;height:420px;background:rgba(255,255,255,.16);filter:blur(10px);border-radius:50%}.hero-grid{position:relative;display:grid;gap:30px;align-items:center}.hero-copy h1{color:#fff;font-size:40px}.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0}.hero-tags span{background:rgba(255,255,255,.17);border:1px solid rgba(255,255,255,.28);padding:7px 11px;border-radius:999px;font-size:13px}.hero-visual{position:relative;padding:18px}.hero-device{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);border-radius:32px;padding:18px;box-shadow:0 20px 60px rgba(20,28,76,.22)}.status-panel{background:#fff;color:var(--text);border-radius:24px;padding:18px;box-shadow:0 18px 40px rgba(22,35,89,.16)}.hero-visual .status-panel{position:relative;margin-top:-20px}.status-row{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:10px 0}.status-row:last-child{border-bottom:0}.status-dot{width:10px;height:10px;border-radius:50%;background:#27C580;display:inline-block;margin-right:8px}.status-pill{color:#1166D8;background:#EAF3FF;border-radius:999px;padding:4px 8px;font-size:12px;font-weight:700}.quick-task-entries,.risk-grid,.faq-grid,.scenario-grid,.info-grid{display:grid;gap:16px}.task-card,.capability-card,.white-panel,.info-card,.risk-card,.faq-item,.step-card,.page-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 24px rgba(26,42,92,.06)}.task-card{padding:22px}.task-card .tag,.capability-card .tag{color:var(--blue);font-size:13px;font-weight:800;margin-bottom:8px}.task-card a,.capability-card a,.text-link{color:var(--blue);font-weight:800}.connection-capability-overview{display:grid;gap:16px}.capability-card{padding:24px}.capability-card.featured{background:linear-gradient(180deg,#fff,#F6FAFF)}.split-section{display:grid;gap:24px;align-items:center}.white-panel{padding:26px}.image-panel{border-radius:30px;background:linear-gradient(180deg,#F4F8FF,#fff);padding:18px;border:1px solid var(--line);box-shadow:var(--shadow)}.feature-list{display:grid;gap:10px;margin:18px 0}.feature-list span,.check-list li{position:relative;padding-left:22px;color:#485467}.feature-list span:before,.check-list li:before{content:"";position:absolute;left:0;top:.7em;width:8px;height:8px;border-radius:50%;background:var(--blue)}.encrypted-tunnel-section .white-panel{background:linear-gradient(180deg,#FFFFFF 0%,#F4F8FF 100%)}.mini-grid{display:grid;gap:14px;margin-top:18px}.mini-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px}.route-status{display:grid;gap:12px}.route-line{display:flex;justify-content:space-between;gap:12px;background:#F8FAFF;border:1px solid var(--line);border-radius:16px;padding:12px}.device-stack{display:grid;gap:12px}.device-stack .device{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px}.data-strip{display:grid;gap:16px}.info-card{padding:20px}.process-steps{display:grid;gap:14px;counter-reset:step}.step-card{padding:20px;position:relative}.step-num{width:34px;height:34px;border-radius:12px;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;margin-bottom:12px}.risk-card{padding:20px;border-left:4px solid var(--blue)}.faq-item{padding:20px}.faq-item h3{font-size:18px}.cta-section{padding:58px 0;background:var(--gradient);color:#fff;border-radius:34px;margin:50px auto;width:min(1180px,calc(100% - 32px));text-align:center;overflow:hidden}.cta-section h2,.cta-section p{color:#fff}.cta-section p{opacity:.88}.page-hero{padding:48px 0 30px;background:linear-gradient(180deg,#F7FAFF,#fff)}.page-hero .container{display:grid;gap:18px}.page-layout{display:grid;gap:24px;align-items:start}.article-panel{background:#fff;border:1px solid var(--line);border-radius:28px;padding:26px;box-shadow:var(--shadow)}.side-panel{background:#F7FAFF;border:1px solid var(--line);border-radius:24px;padding:22px;position:sticky;top:92px}.content-section{padding:36px 0 66px}.check-list{list-style:none;margin:16px 0 0;padding:0;display:grid;gap:10px}.notice{background:#F4F8FF;border:1px solid #DCEBFF;border-radius:20px;padding:18px;margin:18px 0}.download-page .article-panel{text-align:center}.download-steps{display:grid;gap:14px;margin:24px 0;text-align:left}.download-steps .step-card{box-shadow:none}.site-footer{background:#111827;color:#D0D5DD;padding:42px 0 26px}.footer-inner{width:min(1180px,calc(100% - 32px));margin:0 auto;display:grid;gap:24px}.footer-logo{color:#fff;font-size:22px;margin-bottom:10px}.site-footer p{color:#AAB3C2}.footer-links{display:grid;gap:10px}.footer-links a{color:#E4E7EC}.copyright{text-align:center;margin:26px auto 0!important;font-size:13px}.pill-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.pill-list span{padding:7px 10px;background:#F2F6FF;border:1px solid var(--line);border-radius:999px;color:#50607A;font-size:13px}.compact-hero-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow)}
@media (min-width:640px){.quick-task-entries,.risk-grid,.faq-grid,.scenario-grid,.info-grid,.mini-grid,.data-strip,.download-steps{grid-template-columns:repeat(2,1fr)}h1{font-size:42px}.hero-copy h1{font-size:46px}}
@media (min-width:900px){.nav-toggle{display:none}.site-nav{position:static;display:flex!important;align-items:center;justify-content:flex-end;background:transparent;border:0;box-shadow:none;border-radius:0;padding:0;gap:2px}.site-nav a{font-size:14px;padding:9px 10px}.hero-grid{grid-template-columns:1.02fr .98fr}.connection-workspace-hero{padding:58px 0 70px}.quick-task-entries{grid-template-columns:repeat(4,1fr);margin-top:-34px;position:relative;z-index:4}.connection-capability-overview{grid-template-columns:repeat(4,1fr)}.capability-card.featured{grid-column:span 2;min-height:210px}.split-section{grid-template-columns:1fr 1fr}.encrypted-tunnel-section .split-section{grid-template-columns:1.1fr .9fr}.route-optimization-section .split-section{grid-template-columns:.9fr 1.1fr}.device-protection-section .split-section{grid-template-columns:1.1fr .9fr}.usage-scenarios-section .scenario-grid{grid-template-columns:repeat(3,1fr)}.risk-grid{grid-template-columns:repeat(4,1fr)}.faq-grid{grid-template-columns:repeat(2,1fr)}.process-steps{grid-template-columns:repeat(3,1fr)}.page-layout{grid-template-columns:minmax(0,1fr) 320px}.page-hero .container{grid-template-columns:1fr 340px;align-items:end}.footer-inner{grid-template-columns:1fr auto}.footer-links{grid-template-columns:repeat(2,auto);gap:10px 24px}.article-panel{padding:34px}.section{padding:78px 0}.mini-grid{grid-template-columns:repeat(3,1fr)}}
@media (min-width:1120px){.site-nav a{font-size:15px;padding:10px 13px}.hero-copy h1{font-size:54px}h2{font-size:34px}.risk-grid{grid-template-columns:repeat(4,1fr)}}
@media (max-width:420px){.header-inner,.container{width:calc(100% - 24px)}h1{font-size:32px}.hero-copy h1{font-size:35px}.connection-workspace-hero{border-radius:0 0 24px 24px}.download-btn{width:100%;min-height:50px}.cta-section{border-radius:24px;width:calc(100% - 24px);padding:42px 18px}.article-panel,.white-panel{padding:22px}.side-panel{position:static}.section{padding:48px 0}.hero-visual{padding:4px}}