* {
  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: #263244;
  background: #f6f8fc;
  line-height: 1.75;
  overflow-x: hidden;
}

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

a {
  color: #2980FE;
  text-decoration: none;
}

a:hover {
  color: #1768E8;
}

.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);
  border-bottom: 1px solid #e6ebf3;
  backdrop-filter: blur(18px);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #162033;
  font-weight: 800;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

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

.brand-text {
  font-size: 18px;
}

.site-nav {
  display: none;
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  padding: 14px;
  background: #fff;
  border: 1px solid #e6ebf3;
  border-radius: 22px;
  box-shadow: 0 18px 45px rgba(21, 32, 51, 0.12);
}

.site-nav a {
  display: block;
  padding: 11px 12px;
  border-radius: 14px;
  color: #4d5b70;
  font-size: 15px;
  font-weight: 650;
}

.site-nav a.active,
.site-nav a:hover {
  color: #2980FE;
  background: #eef5ff;
}

.nav-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.nav-toggle-label {
  width: 44px;
  height: 44px;
  display: grid;
  place-content: center;
  gap: 5px;
  border-radius: 14px;
  border: 1px solid #dfe6f1;
  background: #fff;
  cursor: pointer;
}

.nav-toggle-label span {
  width: 20px;
  height: 2px;
  background: #263244;
  border-radius: 10px;
}

.nav-toggle:checked ~ .site-nav {
  display: block;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 26px;
  border-radius: 999px;
  background: #2980FE;
  color: #fff;
  font-weight: 800;
  font-size: 16px;
  box-shadow: 0 12px 28px rgba(41,128,254,0.26);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
  background: #1768E8;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(23,104,232,0.28);
}

.vpn-network-hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  padding: 56px 0 74px;
}

.vpn-network-hero::before,
.vpn-network-hero::after {
  content: "";
  position: absolute;
  inset: auto;
  border-radius: 999px;
  filter: blur(10px);
  opacity: .55;
  pointer-events: none;
}

.vpn-network-hero::before {
  width: 420px;
  height: 420px;
  right: -150px;
  top: 50px;
  background: rgba(255,255,255,.17);
}

.vpn-network-hero::after {
  width: 520px;
  height: 2px;
  left: 6%;
  bottom: 70px;
  background: linear-gradient(90deg, rgba(255,255,255,.1), rgba(255,255,255,.75), rgba(255,255,255,.1));
  box-shadow: 0 -90px 0 rgba(255,255,255,.12), 0 -180px 0 rgba(255,255,255,.1);
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 34px;
  align-items: center;
}

.hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(34px, 9vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.06em;
}

.hero-copy p {
  margin: 0 0 24px;
  color: rgba(255,255,255,.88);
  font-size: 17px;
  max-width: 680px;
}

.hero-tags,
.hero-status-row,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-tags {
  margin-top: 22px;
}

.hero-tags span,
.hero-status-row span,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.26);
}

.hero-visual {
  position: relative;
  min-height: 380px;
  display: grid;
  place-items: center;
}

.hero-device {
  position: relative;
  z-index: 2;
  width: min(430px, 92%);
  border-radius: 32px;
  padding: 18px;
  background: rgba(255,255,255,.17);
  border: 1px solid rgba(255,255,255,.25);
  box-shadow: 0 28px 70px rgba(17, 24, 39, .22);
}

.hero-device img {
  border-radius: 26px;
  margin: auto;
  max-height: 420px;
  object-fit: contain;
}

.float-card {
  position: absolute;
  z-index: 3;
  padding: 11px 14px;
  border-radius: 16px;
  color: #1b2840;
  background: rgba(255,255,255,.94);
  border: 1px solid rgba(255,255,255,.72);
  box-shadow: 0 18px 36px rgba(17, 24, 39, .18);
  font-size: 13px;
  font-weight: 800;
}

.float-card.one { left: 0; top: 12%; }
.float-card.two { right: 0; top: 25%; }
.float-card.three { left: 4%; bottom: 18%; }
.float-card.four { right: 4%; bottom: 8%; }

.section {
  padding: 68px 0;
}

.section-light {
  background: #fff;
}

.section-soft {
  background: #eef4fb;
}

.section-head {
  margin-bottom: 26px;
}

.section-head.center {
  text-align: center;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.eyebrow {
  margin: 0 0 8px;
  color: #2980FE;
  font-weight: 850;
  letter-spacing: .08em;
  font-size: 13px;
}

h1, h2, h3 {
  color: #152033;
  line-height: 1.22;
}

.vpn-network-hero h1 {
  color: #fff;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(28px, 5.6vw, 42px);
  letter-spacing: -0.04em;
}

h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.muted {
  color: #66758a;
}

.node-overview {
  margin-top: -42px;
  position: relative;
  z-index: 4;
}

.node-grid {
  display: grid;
  gap: 16px;
}

.node-card,
.feature-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.aside-card {
  background: #fff;
  border: 1px solid #e4eaf3;
  border-radius: 24px;
  padding: 22px;
  box-shadow: 0 12px 34px rgba(31, 45, 71, .07);
}

.node-card .mini-label {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 5px 10px;
  border-radius: 999px;
  background: #eef5ff;
  color: #2980FE;
  font-size: 12px;
  font-weight: 850;
}

.node-card p,
.feature-card p,
.info-card p,
.risk-card p,
.step-card p {
  margin: 0 0 14px;
  color: #66758a;
}

.text-link {
  font-weight: 800;
}

.split-section,
.vpn-connection-section,
.global-nodes-section,
.high-speed-section,
.privacy-protection-section,
.multi-device-section {
  display: grid;
  gap: 28px;
  align-items: center;
}

.visual-panel {
  position: relative;
  overflow: hidden;
  border-radius: 32px;
  padding: 24px;
  background: linear-gradient(135deg, #ffffff 0%, #eff5ff 100%);
  border: 1px solid #e5ebf4;
  box-shadow: 0 18px 48px rgba(31, 45, 71, .08);
}

.visual-panel img {
  margin: auto;
  max-height: 420px;
  object-fit: contain;
}

.feature-list {
  display: grid;
  gap: 12px;
  margin: 22px 0;
}

.feature-list li,
.check-list li {
  list-style: none;
  position: relative;
  padding-left: 28px;
  color: #4d5b70;
}

.feature-list li::before,
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #2980FE;
  box-shadow: 0 0 0 5px #e7f1ff;
}

.map-card {
  position: relative;
  overflow: hidden;
  border-radius: 32px;
  padding: 28px;
  color: #fff;
  background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
}

.map-card::before {
  content: "";
  position: absolute;
  inset: 22px;
  opacity: .28;
  background-image:
    radial-gradient(circle at 20% 30%, #fff 0 3px, transparent 4px),
    radial-gradient(circle at 50% 50%, #fff 0 3px, transparent 4px),
    radial-gradient(circle at 75% 35%, #fff 0 3px, transparent 4px),
    linear-gradient(45deg, transparent 49%, rgba(255,255,255,.4) 50%, transparent 51%);
  background-size: 180px 120px, 240px 180px, 180px 160px, 70px 70px;
}

.map-card img,
.map-card .map-content {
  position: relative;
  z-index: 2;
}

.map-card img {
  margin: 0 auto 18px;
  max-height: 280px;
}

.map-content h3 {
  color: #fff;
}

.map-content p {
  color: rgba(255,255,255,.86);
}

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

.speed-line {
  padding: 16px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid #e4eaf3;
}

.speed-line span {
  display: block;
  margin-bottom: 8px;
  color: #1f2d47;
  font-weight: 850;
}

.speed-line i {
  display: block;
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #2980FE, #7B4EF1);
}

.privacy-panel,
.protocol-panel {
  border-radius: 30px;
  padding: 24px;
  background: #fff;
  border: 1px solid #e4eaf3;
  box-shadow: 0 18px 48px rgba(31, 45, 71, .08);
}

.privacy-panel img,
.protocol-panel img {
  max-height: 330px;
  margin: 0 auto 18px;
}

.privacy-items,
.policy-grid,
.protocol-grid,
.device-grid,
.risk-grid,
.faq-grid {
  display: grid;
  gap: 16px;
}

.privacy-items div,
.protocol-grid div,
.device-grid div {
  padding: 16px;
  border-radius: 18px;
  background: #f6f8fc;
  border: 1px solid #e8eef6;
}

.no-log-policy-section .policy-grid {
  margin-top: 24px;
}

.policy-grid .info-card {
  border-top: 4px solid #2980FE;
}

.device-card {
  display: grid;
  gap: 16px;
  align-items: center;
  padding: 20px;
  border-radius: 26px;
  background: #fff;
  border: 1px solid #e4eaf3;
}

.device-card img {
  max-height: 260px;
  margin: 0 auto;
}

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

.step-card {
  position: relative;
  padding-top: 54px;
}

.step-number {
  position: absolute;
  top: 18px;
  left: 22px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: #fff;
  background: #2980FE;
  border-radius: 12px;
  font-weight: 900;
}

.risk-card {
  border-left: 5px solid #2980FE;
}

.risk-card strong {
  display: block;
  color: #152033;
  margin-bottom: 5px;
}

.cta-section {
  color: #fff;
  text-align: center;
  background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  border-radius: 34px;
  padding: 42px 22px;
  position: relative;
  overflow: hidden;
}

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

.cta-section p {
  max-width: 680px;
  margin: 0 auto 22px;
  color: rgba(255,255,255,.86);
}

.page-hero {
  padding: 62px 0 38px;
  background:
    radial-gradient(circle at 80% 0%, rgba(123,78,241,.18), transparent 32%),
    linear-gradient(180deg, #fff 0%, #f6f8fc 100%);
}

.page-hero h1 {
  margin: 10px 0 14px;
  font-size: clamp(34px, 7vw, 54px);
  letter-spacing: -0.05em;
}

.page-hero p {
  max-width: 780px;
  margin: 0;
  color: #66758a;
  font-size: 17px;
}

.category-badge {
  display: inline-flex;
  border-radius: 999px;
  padding: 6px 12px;
  background: #eef5ff;
  color: #2980FE;
  font-weight: 850;
  font-size: 13px;
}

.content-layout {
  display: grid;
  gap: 24px;
  align-items: start;
}

.article-card {
  background: #fff;
  border: 1px solid #e4eaf3;
  border-radius: 30px;
  padding: 24px;
  box-shadow: 0 14px 42px rgba(31, 45, 71, .07);
}

.article-card h2 {
  font-size: clamp(24px, 5vw, 34px);
}

.article-card p {
  color: #4d5b70;
}

.inline-cards {
  display: grid;
  gap: 14px;
  margin: 22px 0;
}

.tip-box {
  padding: 18px;
  border-radius: 22px;
  background: #eef5ff;
  border: 1px solid #d8e7ff;
  color: #3c4a60;
}

.download-block {
  margin-top: 28px;
  padding: 22px;
  border-radius: 26px;
  background: #f6f8fc;
  border: 1px solid #e4eaf3;
}

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

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

.faq-item p {
  margin: 0;
  color: #66758a;
}

.download-steps {
  display: grid;
  gap: 14px;
  margin: 24px 0;
}

.download-step {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid #e4eaf3;
}

.download-step span {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: #eef5ff;
  color: #2980FE;
  font-weight: 900;
}

.site-footer {
  padding: 52px 0 26px;
  background: #101827;
  color: #c9d3e4;
}

.footer-grid {
  display: grid;
  gap: 28px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  margin-bottom: 12px;
}

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

.site-footer h3 {
  color: #fff;
  font-size: 16px;
}

.site-footer a {
  display: block;
  color: #c9d3e4;
  margin: 8px 0;
}

.site-footer a:hover {
  color: #fff;
}

.footer-bottom {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.12);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  color: #93a1b8;
  font-size: 14px;
}

@media (min-width: 680px) {
  .node-grid,
  .policy-grid,
  .protocol-grid,
  .device-grid,
  .risk-grid,
  .faq-grid,
  .inline-cards,
  .process-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .download-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-card {
    padding: 34px;
  }
}

@media (min-width: 960px) {
  .nav-toggle-label {
    display: none;
  }

  .site-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .site-nav a {
    display: inline-flex;
    padding: 9px 12px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr) 480px;
  }

  .node-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .split-section,
  .vpn-connection-section,
  .global-nodes-section,
  .high-speed-section,
  .privacy-protection-section,
  .multi-device-section {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .content-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
  }

  .risk-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .process-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1.3fr .8fr .8fr 1fr;
  }

  .device-card {
    grid-template-columns: .95fr 1.05fr;
  }
}

@media (max-width: 430px) {
  .container {
    width: min(100% - 24px, 1120px);
  }

  .vpn-network-hero {
    padding-top: 42px;
  }

  .float-card {
    position: static;
    margin: 8px 4px 0;
    display: inline-flex;
  }

  .hero-visual {
    min-height: auto;
    display: block;
  }

  .hero-device {
    margin: 12px auto;
  }

  .section {
    padding: 50px 0;
  }

  .download-btn {
    width: 100%;
  }
}