* {
  box-sizing: border-box;
}

:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #263244;
  --muted: #647084;
  --light: #F5F7FB;
  --soft-blue: #EEF5FF;
  --line: #E5EAF2;
  --white: #FFFFFF;
  --deep: #152238;
  --radius: 24px;
  --shadow: 0 18px 45px rgba(41, 128, 254, 0.12);
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.75;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

p {
  margin: 0 0 16px;
  color: var(--muted);
}

h1, h2, h3 {
  margin: 0 0 16px;
  color: var(--deep);
  line-height: 1.22;
}

h1 {
  font-size: clamp(32px, 8vw, 58px);
  letter-spacing: -1px;
}

h2 {
  font-size: clamp(26px, 5vw, 40px);
}

h3 {
  font-size: 21px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(229, 234, 242, 0.88);
}

.header-inner,
.footer-inner,
.container {
  width: min(1160px, calc(100% - 36px));
  margin: 0 auto;
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--deep);
  white-space: nowrap;
}

.logo img {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  object-fit: cover;
}

.menu-toggle {
  border: 1px solid var(--line);
  background: #fff;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background: var(--deep);
  border-radius: 10px;
}

.main-nav {
  position: absolute;
  left: 18px;
  right: 18px;
  top: 78px;
  display: none;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.main-nav.open {
  display: flex;
}

.main-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #526074;
  font-size: 15px;
}

.main-nav a.active,
.main-nav a:hover {
  color: var(--blue);
  background: var(--soft-blue);
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 14px 28px rgba(41, 128, 254, 0.28);
  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, 0.32);
}

.vpn-network-hero {
  position: relative;
  overflow: hidden;
  background: var(--gradient);
  color: #fff;
  padding: 68px 0 42px;
}

.vpn-network-hero::before,
.global-nodes-section::before,
.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 25%, rgba(255,255,255,.26) 0 2px, transparent 3px), radial-gradient(circle at 70% 45%, rgba(255,255,255,.22) 0 2px, transparent 3px), radial-gradient(circle at 50% 80%, rgba(255,255,255,.18) 0 2px, transparent 3px), linear-gradient(120deg, transparent 0 42%, rgba(255,255,255,.18) 43%, transparent 44% 100%);
  opacity: .7;
}

.hero-grid {
  position: relative;
  display: grid;
  gap: 34px;
  align-items: center;
}

.hero-copy h1,
.hero-copy p {
  color: #fff;
}

.hero-copy p {
  max-width: 660px;
  font-size: 17px;
  opacity: .92;
}

.hero-tags,
.status-stack,
.inline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 26px;
}

.hero-tags span,
.status-stack span,
.inline-tags span,
.badge {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.hero-tags span {
  background: rgba(255,255,255,.16);
  color: #fff;
  border: 1px solid rgba(255,255,255,.25);
}

.hero-visual {
  position: relative;
  border-radius: 32px;
  padding: 20px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.26);
  box-shadow: 0 30px 75px rgba(20, 29, 75, .24);
}

.hero-visual img {
  width: min(420px, 100%);
  margin: 0 auto;
  border-radius: 28px;
}

.status-stack span {
  position: relative;
  background: #fff;
  color: var(--blue);
  box-shadow: 0 12px 28px rgba(21, 34, 56, .13);
}

.section,
.page-section {
  padding: 76px 0;
}

.section-muted {
  background: var(--light);
}

.section-head {
  max-width: 740px;
  margin-bottom: 28px;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.node-overview {
  margin-top: -34px;
  position: relative;
  z-index: 2;
}

.node-grid,
.feature-grid,
.policy-grid,
.risk-grid,
.faq-grid,
.quick-grid {
  display: grid;
  gap: 18px;
}

.node-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.help-card,
.policy-card,
.article-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 12px 34px rgba(21, 34, 56, .06);
}

.node-card .tag,
.info-card .tag,
.policy-card .tag {
  display: inline-flex;
  color: var(--blue);
  background: var(--soft-blue);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 12px;
}

.text-link {
  color: var(--blue);
  font-weight: 800;
}

.split-section,
.vpn-connection-section,
.high-speed-section,
.privacy-protection-section,
.multi-device-section,
.encryption-protocol-section {
  display: grid;
  gap: 30px;
  align-items: center;
}

.image-panel {
  border-radius: 32px;
  padding: 18px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.image-panel img {
  border-radius: 24px;
  margin: 0 auto;
}

.check-list,
.simple-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: grid;
  gap: 10px;
}

.check-list li,
.simple-list li {
  position: relative;
  padding-left: 28px;
  color: var(--muted);
}

.check-list li::before,
.simple-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 5px rgba(41,128,254,.12);
}

.global-nodes-section {
  position: relative;
  overflow: hidden;
  border-radius: 34px;
  padding: 34px;
  background: var(--gradient);
  color: #fff;
}

.global-nodes-section h2,
.global-nodes-section p,
.global-nodes-section li {
  color: #fff;
}

.node-map-card {
  position: relative;
  background: rgba(255,255,255,.96);
  color: var(--text);
  border-radius: 28px;
  padding: 22px;
  box-shadow: 0 24px 55px rgba(21, 34, 56, .18);
}

.node-map-card p,
.node-map-card li {
  color: var(--muted);
}

.speed-lines {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.speed-line {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 16px;
}

.speed-bar {
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, #2980FE, #9BC6FF);
  margin-top: 10px;
}

.privacy-panel,
.tech-panel,
.safety-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: 26px;
  box-shadow: var(--shadow);
}

.privacy-bounds {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.privacy-bounds div,
.tech-row {
  border: 1px solid var(--line);
  background: #FAFCFF;
  border-radius: 18px;
  padding: 16px;
}

.process-steps {
  display: grid;
  gap: 16px;
  counter-reset: step;
}

.step-card {
  position: relative;
  padding-top: 58px;
}

.step-no {
  position: absolute;
  top: 20px;
  left: 22px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.risk-card {
  border-left: 4px solid var(--blue);
}

.risk-card strong {
  display: block;
  color: var(--deep);
  margin-bottom: 8px;
}

.faq-item h3 {
  font-size: 18px;
}

.cta-section {
  position: relative;
  overflow: hidden;
  background: var(--gradient);
  color: #fff;
  border-radius: 34px;
  padding: 46px 22px;
  text-align: center;
}

.cta-section h2,
.cta-section p {
  color: #fff;
}

.cta-section > * {
  position: relative;
}

.page-hero {
  background: linear-gradient(180deg, #F5F8FF 0%, #FFFFFF 100%);
  padding: 58px 0 38px;
  border-bottom: 1px solid var(--line);
}

.page-hero .container {
  max-width: 900px;
}

.badge {
  background: var(--soft-blue);
  color: var(--blue);
  margin-bottom: 14px;
}

.article-layout {
  display: grid;
  gap: 24px;
}

.article-main {
  min-width: 0;
}

.article-main .article-card + .article-card {
  margin-top: 18px;
}

.side-panel {
  display: grid;
  gap: 16px;
  align-self: start;
}

.notice-box,
.action-box {
  border-radius: 22px;
  padding: 22px;
  background: #F9FBFF;
  border: 1px solid var(--line);
}

.action-box {
  background: var(--deep);
}

.action-box h3,
.action-box p {
  color: #fff;
}

.action-box .download-btn {
  margin-top: 8px;
}

.download-page-card {
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
}

.install-steps {
  display: grid;
  gap: 14px;
  margin-top: 28px;
  text-align: left;
}

.install-steps li {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px 18px;
  color: var(--muted);
}

.site-footer {
  background: #F7F9FC;
  border-top: 1px solid var(--line);
  margin-top: 48px;
}

.footer-inner {
  display: grid;
  gap: 28px;
  padding: 42px 0;
}

.footer-brand p {
  max-width: 440px;
  margin-top: 14px;
}

.footer-links {
  display: grid;
  gap: 20px;
}

.footer-links div {
  display: grid;
  gap: 8px;
}

.footer-links strong {
  color: var(--deep);
}

.footer-links a {
  color: var(--muted);
}

.footer-links a:hover {
  color: var(--blue);
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 18px;
  text-align: center;
}

.footer-bottom p {
  margin: 0;
  font-size: 14px;
}

@media (min-width: 700px) {
  .node-grid,
  .policy-grid,
  .faq-grid,
  .quick-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .risk-grid,
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .process-steps,
  .install-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .menu-toggle {
    display: none;
  }
  .main-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4px;
    padding: 0;
    border: 0;
    box-shadow: none;
    background: transparent;
  }
  .main-nav a {
    font-size: 14px;
  }
  .hero-grid,
  .split-section,
  .vpn-connection-section,
  .high-speed-section,
  .privacy-protection-section,
  .multi-device-section,
  .encryption-protocol-section,
  .article-layout,
  .footer-inner {
    grid-template-columns: 1.05fr .95fr;
  }
  .node-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .policy-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .risk-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .process-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .section,
  .page-section {
    padding: 92px 0;
  }
  .vpn-network-hero {
    padding: 92px 0 78px;
  }
}