:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #1f2937;
  --muted: #657184;
  --light: #f5f7fb;
  --line: #e6eaf2;
  --white: #ffffff;
  --radius-lg: 28px;
  --radius-md: 20px;
  --shadow: 0 18px 50px rgba(31, 41, 55, 0.10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "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; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .3px; }
.logo, .footer-brand img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
  color: var(--text);
  width: 42px;
  height: 42px;
  font-size: 22px;
  line-height: 1;
}
.main-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 70px;
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--white);
  box-shadow: var(--shadow);
}
.main-nav.is-open { display: flex; }
.main-nav a { padding: 10px 12px; border-radius: 12px; color: #344054; font-size: 14px; }
.main-nav a:hover { background: #eef5ff; color: var(--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: #ffffff;
  font-weight: 700;
  border: 0;
  box-shadow: 0 12px 26px rgba(41, 128, 254, .28);
  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 34px rgba(23, 104, 232, .32); }
.hero-gradient, .vpn-network-hero, .cta-section { background: var(--gradient); color: #ffffff; }
.vpn-network-hero {
  position: relative;
  overflow: hidden;
  padding: 74px 0 50px;
}
.vpn-network-hero::before, .vpn-network-hero::after {
  content: "";
  position: absolute;
  inset: auto;
  border-radius: 50%;
  pointer-events: none;
}
.vpn-network-hero::before { width: 360px; height: 360px; right: -110px; top: -90px; background: rgba(255,255,255,.15); }
.vpn-network-hero::after { width: 520px; height: 520px; left: -240px; bottom: -260px; background: rgba(255,255,255,.10); }
.hero-grid { position: relative; z-index: 1; display: grid; gap: 28px; align-items: center; }
.eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  color: var(--blue);
  background: #eef5ff;
  border: 1px solid #d8e7ff;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
}
.vpn-network-hero .eyebrow { color: #ffffff; background: rgba(255,255,255,.14); border-color: rgba(255,255,255,.25); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; }
h1 { font-size: clamp(32px, 9vw, 58px); letter-spacing: -1.2px; }
h2 { font-size: clamp(26px, 6vw, 40px); letter-spacing: -.6px; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.vpn-network-hero p { color: rgba(255,255,255,.88); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin: 24px 0; }
.hero-tags, .inline-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span, .inline-tags span, .status-tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.22);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}
.hero-visual { position: relative; min-height: 360px; }
.hero-card {
  position: relative;
  z-index: 2;
  padding: 18px;
  border-radius: 32px;
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.26);
  box-shadow: 0 24px 60px rgba(19, 29, 77, .24);
}
.hero-card img { border-radius: 24px; margin: 0 auto; }
.node-line {
  position: absolute;
  inset: 36px 10px 24px;
  background-image: radial-gradient(circle at 12% 28%, rgba(255,255,255,.9) 0 4px, transparent 5px), radial-gradient(circle at 78% 22%, rgba(255,255,255,.75) 0 4px, transparent 5px), radial-gradient(circle at 40% 74%, rgba(255,255,255,.75) 0 4px, transparent 5px), linear-gradient(125deg, transparent 18%, rgba(255,255,255,.28) 19%, transparent 20%, transparent 58%, rgba(255,255,255,.28) 59%, transparent 60%);
  opacity: .9;
}
.float-status {
  position: absolute;
  z-index: 3;
  display: grid;
  gap: 2px;
  min-width: 116px;
  padding: 10px 12px;
  border-radius: 16px;
  background: #ffffff;
  color: #23304a;
  box-shadow: 0 14px 36px rgba(20, 31, 78, .18);
  font-size: 12px;
  font-weight: 800;
}
.float-status small { color: var(--muted); font-weight: 600; }
.float-status.one { top: 20px; left: 0; }
.float-status.two { top: 82px; right: 0; }
.float-status.three { bottom: 78px; left: 2px; }
.float-status.four { bottom: 16px; right: 12px; }
.section { padding: 70px 0; }
.section.alt { background: var(--light); }
.section-head { max-width: 760px; margin-bottom: 28px; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.node-overview { margin-top: -30px; position: relative; z-index: 3; }
.overview-grid, .card-grid, .risk-grid, .faq-grid, .policy-grid, .device-grid, .protocol-grid { display: grid; gap: 16px; }
.node-card, .info-card, .risk-card, .faq-item, .policy-card, .step-card, .side-panel, .article-card, .safe-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: 0 10px 28px rgba(31,41,55,.06);
}
.node-card .tag-mini, .tag-mini {
  display: inline-flex;
  align-items: center;
  color: var(--blue);
  background: #eef5ff;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 10px;
}
.text-link { color: var(--blue); font-weight: 800; }
.text-link:hover { color: var(--blue-dark); }
.feature-grid { display: grid; gap: 28px; align-items: center; }
.feature-image { border-radius: 30px; overflow: hidden; background: #eef3ff; padding: 16px; box-shadow: var(--shadow); }
.feature-image img { border-radius: 22px; margin: 0 auto; }
.feature-list { display: grid; gap: 12px; margin: 18px 0 8px; padding: 0; list-style: none; }
.feature-list li { position: relative; padding-left: 28px; color: #3b4657; }
.feature-list li::before { content: ""; position: absolute; left: 0; top: 12px; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); }
.global-nodes-section { position: relative; overflow: hidden; background: #f7f9fe; }
.map-panel {
  position: relative;
  min-height: 360px;
  border-radius: 32px;
  background: linear-gradient(135deg, #ffffff, #eef5ff);
  border: 1px solid var(--line);
  padding: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.map-panel::before {
  content: "";
  position: absolute;
  inset: 28px;
  border-radius: 28px;
  background-image: radial-gradient(circle at 18% 38%, #2980FE 0 5px, transparent 6px), radial-gradient(circle at 60% 26%, #7B4EF1 0 5px, transparent 6px), radial-gradient(circle at 76% 68%, #B84DDA 0 5px, transparent 6px), linear-gradient(115deg, transparent 30%, rgba(41,128,254,.22) 31%, transparent 32%, transparent 64%, rgba(123,78,241,.18) 65%, transparent 66%);
  opacity: .85;
}
.map-panel img { position: relative; z-index: 1; margin: 54px auto 0; max-height: 270px; object-fit: contain; }
.speed-cards { display: grid; gap: 14px; margin-top: 18px; }
.speed-card { padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.speed-card strong { display: block; color: var(--text); }
.privacy-panel {
  border-radius: 30px;
  padding: 22px;
  background: linear-gradient(180deg, #fff, #f5f8ff);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.privacy-panel img { border-radius: 22px; margin-bottom: 16px; }
.panel-row { display: flex; justify-content: space-between; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.panel-row:last-child { border-bottom: 0; }
.panel-row span { color: var(--muted); }
.no-log-policy-section .policy-card { border-top: 4px solid var(--blue); }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-top: 52px; }
.step-card::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 22px;
  top: 18px;
  width: 42px;
  height: 28px;
  border-radius: 999px;
  background: #eef5ff;
  color: var(--blue);
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 13px;
}
.risk-card { border-left: 4px solid var(--blue); }
.risk-card b { display: block; margin: 8px 0 4px; color: var(--text); }
.faq-item h3 { font-size: 18px; }
.cta-section { padding: 62px 0; text-align: center; position: relative; overflow: hidden; }
.cta-section p { color: rgba(255,255,255,.86); max-width: 720px; margin-left: auto; margin-right: auto; }
.cta-section .download-btn { margin-top: 18px; background: var(--blue); }
.page-hero { padding: 58px 0 34px; background: linear-gradient(180deg, #f5f8ff, #ffffff); border-bottom: 1px solid var(--line); }
.page-hero .container { display: grid; gap: 14px; }
.page-layout { padding: 54px 0 72px; }
.article-layout { display: grid; gap: 24px; align-items: start; }
.article-main { display: grid; gap: 18px; }
.article-main p { font-size: 16px; }
.article-card ul, .article-card ol, .safe-card ul, .safe-card ol { margin: 0; padding-left: 20px; color: #465467; }
.article-card li, .safe-card li { margin: 8px 0; }
.side-panel { position: sticky; top: 90px; }
.side-panel a { display: block; padding: 10px 0; color: var(--blue); font-weight: 700; border-bottom: 1px solid var(--line); }
.side-panel a:last-child { border-bottom: 0; }
.download-page-card { max-width: 780px; margin: 0 auto; text-align: center; }
.download-steps { display: grid; gap: 14px; text-align: left; margin-top: 28px; }
.about-values { display: grid; gap: 16px; }
.site-footer { background: #111827; color: #d1d5db; padding: 48px 0 24px; }
.site-footer p, .site-footer a, .footer-bottom { color: #aeb7c5; }
.site-footer h3 { color: #ffffff; font-size: 16px; margin-bottom: 8px; }
.site-footer a { display: block; margin: 7px 0; }
.footer-grid { display: grid; gap: 28px; }
.footer-brand { color: #ffffff; margin-bottom: 12px; }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; }
@media (min-width: 640px) {
  .overview-grid, .card-grid, .policy-grid, .risk-grid, .faq-grid, .device-grid, .protocol-grid, .download-steps, .about-values { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 860px) {
  .nav-toggle { display: none; }
  .main-nav { position: static; display: flex; flex-direction: row; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; gap: 2px; }
  .main-nav a { padding: 8px 10px; }
  .hero-grid, .feature-grid, .article-layout { grid-template-columns: 1.05fr .95fr; }
  .overview-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .policy-grid, .risk-grid, .protocol-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.5fr repeat(3, 1fr); }
  .vpn-network-hero { padding: 96px 0 82px; }
}
@media (min-width: 1024px) {
  .main-nav a { padding: 8px 12px; }
  .section { padding: 86px 0; }
  .device-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 420px) {
  .container { width: min(100% - 24px, 1120px); }
  .download-btn { width: 100%; }
  .hero-actions .download-btn, .cta-section .download-btn, .download-page-card .download-btn { width: auto; min-width: 180px; }
  .float-status { position: relative; display: inline-grid; margin: 8px 8px 0 0; top: auto !important; right: auto !important; bottom: auto !important; left: auto !important; }
  .hero-visual { min-height: auto; }
  .node-line { display: none; }
}