:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #202635;
  --muted: #626B7B;
  --line: #E5EAF3;
  --soft: #F5F7FB;
  --soft-blue: #EEF5FF;
  --white: #FFFFFF;
  --radius: 24px;
  --shadow: 0 18px 50px rgba(23, 43, 99, 0.10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: #FFFFFF;
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.narrow { width: min(820px, calc(100% - 32px)); }
.gradient-bg { background: var(--gradient); }
.soft-bg { background: var(--soft); }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(229,234,243,.85);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #1D2740; white-space: nowrap; }
.logo { width: 38px; height: 38px; object-fit: cover; border-radius: 12px; box-shadow: 0 8px 22px rgba(41,128,254,.15); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label { color: var(--blue); border: 1px solid var(--line); padding: 8px 12px; border-radius: 999px; font-weight: 700; cursor: pointer; }
.site-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  display: none;
  flex-direction: column;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
  box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: flex; }
.site-nav a { padding: 10px 12px; color: #3C465B; border-radius: 12px; font-weight: 650; }
.site-nav a:hover, .site-nav a.active { color: var(--blue); background: var(--soft-blue); }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 24px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 24px rgba(41,128,254,.25);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 16px 32px rgba(23,104,232,.26); }
.vpn-network-hero { position: relative; overflow: hidden; color: #fff; padding: 74px 0 92px; }
.vpn-network-hero::before, .vpn-network-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,.16);
  filter: blur(10px);
}
.vpn-network-hero::before { width: 280px; height: 280px; left: -80px; top: -80px; }
.vpn-network-hero::after { width: 360px; height: 360px; right: -120px; bottom: -140px; }
.hero-grid { position: relative; z-index: 1; display: grid; gap: 42px; align-items: center; }
.eyebrow, .section-kicker, .badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .02em;
}
.eyebrow { background: rgba(255,255,255,.16); color: #fff; border: 1px solid rgba(255,255,255,.24); }
.section-kicker, .badge { color: var(--blue); background: var(--soft-blue); }
.hero-copy h1 { margin: 18px 0 16px; font-size: clamp(36px, 9vw, 64px); line-height: 1.08; letter-spacing: -0.04em; }
.hero-copy p { margin: 0 0 26px; color: rgba(255,255,255,.9); font-size: 17px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span { padding: 8px 12px; border: 1px solid rgba(255,255,255,.28); border-radius: 999px; background: rgba(255,255,255,.12); font-weight: 700; }
.hero-visual { position: relative; min-height: 360px; display: grid; place-items: center; }
.hero-image { position: relative; z-index: 2; width: min(360px, 82vw); border-radius: 34px; filter: drop-shadow(0 30px 50px rgba(10, 20, 70, .28)); }
.network-orbit { position: absolute; width: min(420px, 90vw); height: min(420px, 90vw); border-radius: 50%; border: 1px solid rgba(255,255,255,.25); }
.network-orbit::before, .network-orbit::after { content:""; position:absolute; inset: 56px; border-radius:50%; border:1px dashed rgba(255,255,255,.28); }
.network-orbit::after { inset: 112px; }
.status-card { position: absolute; z-index: 3; padding: 10px 14px; border-radius: 16px; background: rgba(255,255,255,.92); color: #29334A; font-weight: 800; box-shadow: 0 18px 42px rgba(14, 30, 78, .18); }
.status-one { left: 0; top: 46px; }
.status-two { right: 0; top: 92px; }
.status-three { left: 16px; bottom: 70px; }
.status-four { right: 20px; bottom: 34px; }
.section { padding: 72px 0; }
.section-heading { margin-bottom: 32px; }
.section-heading.centered { text-align: center; display: grid; justify-items: center; }
.section-heading h2, .text-panel h2, .nodes-copy h2, .speed-cards h2, .protocol-copy h2, .privacy-grid h2 { margin: 12px 0 10px; font-size: clamp(28px, 5vw, 44px); line-height: 1.18; letter-spacing: -0.03em; }
.section-heading p, .text-panel p, .nodes-copy p, .speed-cards p, .protocol-copy p, .privacy-grid p { color: var(--muted); margin: 0; }
.node-overview { display: grid; gap: 16px; }
.node-card, .policy-grid article, .risk-grid article, .process-steps article, .info-grid article, .card-panel, .side-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 38px rgba(33, 52, 92, .06);
}
.node-card { padding: 24px; }
.node-card span { display: inline-flex; color: var(--blue); background: var(--soft-blue); padding: 4px 10px; border-radius: 999px; font-weight: 900; }
.node-card h3, .policy-grid h3, .risk-grid h3, .process-steps h3, .info-grid h3 { margin: 14px 0 6px; font-size: 20px; }
.node-card p, .policy-grid p, .risk-grid p, .process-steps p, .info-grid p, .side-card p { color: var(--muted); margin: 0; }
.node-card a, .text-link, .risk-grid a, .process-steps a, .side-card a { color: var(--blue); font-weight: 800; display: inline-flex; margin-top: 12px; }
.split-grid, .speed-grid, .privacy-grid, .protocol-grid, .nodes-map-grid, .two-column, .content-layout { display: grid; gap: 28px; align-items: center; }
.image-panel { background: linear-gradient(180deg, #F8FAFF 0%, #EDF4FF 100%); border: 1px solid var(--line); border-radius: 32px; padding: 18px; box-shadow: var(--shadow); }
.image-panel img, .map-panel img, .privacy-panel img, .protocol-panel img { width: 100%; border-radius: 24px; object-fit: cover; }
.feature-list, .check-list { padding: 0; margin: 22px 0; list-style: none; display: grid; gap: 10px; }
.feature-list li, .check-list li { padding-left: 28px; position: relative; color: #37425A; }
.feature-list li::before, .check-list li::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); position: absolute; left: 4px; top: 12px; }
.global-nodes-section { background: #F8FAFF; position: relative; overflow: hidden; }
.global-nodes-section::before { content:""; position:absolute; inset: 56px 0 auto; height: 1px; background: linear-gradient(90deg, transparent, rgba(41,128,254,.28), transparent); }
.map-panel { position: relative; padding: 18px; border-radius: 32px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.map-panel::after { content:""; position:absolute; width: 12px; height: 12px; right: 18%; top: 24%; background: var(--blue); border-radius:50%; box-shadow: 0 0 0 8px rgba(41,128,254,.12), -120px 80px 0 #7B4EF1, -200px -26px 0 #B84DDA; }
.mini-cards { display:flex; flex-wrap: wrap; gap:10px; margin: 20px 0 2px; }
.mini-cards span, .privacy-tags span { padding: 8px 12px; background: #fff; border: 1px solid var(--line); border-radius: 999px; color: #44506A; font-weight: 750; }
.high-speed-section { background: #F4F8FF; }
.speed-cards { display: grid; gap: 14px; }
.speed-line { display: flex; justify-content: space-between; gap: 14px; align-items: center; padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.speed-line span { color: var(--muted); }
.privacy-panel, .protocol-panel { padding: 18px; border-radius: 32px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
.privacy-tags { display:flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.policy-grid, .risk-grid, .process-steps, .info-grid { display: grid; gap: 16px; }
.policy-grid article, .risk-grid article, .process-steps article, .info-grid article { padding: 22px; }
.centered-action { text-align: center; margin-top: 24px; }
.protocol-panel { display: grid; gap: 14px; }
.protocol-panel strong { display: block; font-size: 20px; }
.protocol-panel span { color: var(--muted); }
.process-steps article span { display: inline-grid; place-items:center; width: 34px; height: 34px; border-radius: 50%; background: var(--blue); color:#fff; font-weight:900; }
.risk-grid article { border-left: 4px solid var(--blue); }
.risk-grid strong { display:block; margin-top: 10px; color:#2E3850; }
.faq-list { display: grid; gap: 14px; }
details { background: #fff; border: 1px solid var(--line); border-radius: 20px; padding: 18px 20px; }
summary { cursor: pointer; font-weight: 850; color: #26324A; }
details p { margin: 12px 0 0; color: var(--muted); }
.cta-section { color: #fff; padding: 70px 0; text-align: center; }
.cta-inner { display: grid; justify-items:center; gap: 14px; }
.cta-inner h2 { margin: 0; font-size: clamp(28px, 6vw, 46px); line-height: 1.2; }
.cta-inner p { margin: 0 0 8px; color: rgba(255,255,255,.9); max-width: 680px; }
.page-hero { padding: 70px 0; background: linear-gradient(180deg, #F4F8FF 0%, #FFFFFF 100%); }
.simple-hero h1 { margin: 18px 0 10px; font-size: clamp(34px, 7vw, 56px); line-height: 1.12; letter-spacing: -0.04em; }
.simple-hero p { margin: 0; color: var(--muted); font-size: 17px; }
.page-content-section { padding-top: 36px; }
.card-panel { padding: 26px; }
.card-panel h2 { margin: 26px 0 10px; font-size: 24px; }
.card-panel h2:first-child { margin-top: 0; }
.card-panel p { color: var(--muted); }
.article-summary { padding: 16px; background: var(--soft-blue); border-radius: 18px; color: #2B477A; font-weight: 750; margin-bottom: 18px; }
.download-area { margin-top: 26px; }
.content-side { display: grid; gap: 16px; align-self: start; }
.side-card { padding: 22px; }
.side-card h3 { margin: 0 0 8px; }
.side-card a { display: block; margin-top: 8px; }
.side-card.emphasized { background: linear-gradient(180deg, #FFFFFF 0%, #F0F6FF 100%); }
.number-list { display: grid; gap: 12px; padding-left: 22px; color: var(--muted); }
.safety-card { background: linear-gradient(180deg, #FFFFFF 0%, #F7FAFF 100%); }
.site-footer { background: #202635; color: rgba(255,255,255,.78); padding-top: 54px; }
.footer-grid { display: grid; gap: 26px; }
.footer-brand { color: #fff; font-weight: 900; font-size: 20px; margin-bottom: 10px; }
.site-footer h3 { margin: 0 0 10px; color: #fff; }
.site-footer a { display: block; margin: 8px 0; color: rgba(255,255,255,.78); }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 32px; padding: 18px 16px; border-top: 1px solid rgba(255,255,255,.12); text-align: center; color: rgba(255,255,255,.62); }
@media (min-width: 700px) {
  .node-overview { grid-template-columns: repeat(2, 1fr); }
  .policy-grid, .risk-grid, .process-steps, .info-grid, .two-column { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
}
@media (min-width: 960px) {
  .nav-toggle-label { display: none; }
  .site-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
  .site-nav a { font-size: 14px; padding: 8px 10px; }
  .hero-grid { grid-template-columns: minmax(0, 1.02fr) minmax(380px, .98fr); }
  .split-grid, .speed-grid, .privacy-grid, .protocol-grid, .nodes-map-grid { grid-template-columns: 1fr 1fr; }
  .split-grid.reverse .text-panel { order: 2; }
  .node-overview { grid-template-columns: repeat(4, 1fr); }
  .policy-grid { grid-template-columns: repeat(3, 1fr); }
  .risk-grid { grid-template-columns: repeat(3, 1fr); }
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .content-layout { grid-template-columns: minmax(0, 1fr) 300px; align-items: start; }
  .content-layout.alt-layout { grid-template-columns: 300px minmax(0, 1fr); }
  .content-layout.alt-layout .content-main { order: 2; }
  .content-layout.alt-layout .content-side { order: 1; }
  .card-panel { padding: 34px; }
}
@media (max-width: 420px) {
  .container { width: min(100% - 24px, 1120px); }
  .section { padding: 56px 0; }
  .vpn-network-hero { padding: 56px 0 72px; }
  .status-card { font-size: 12px; padding: 8px 10px; }
  .speed-line { align-items: flex-start; flex-direction: column; }
  .download-btn { width: 100%; }
}