* {
  box-sizing: border-box;
}

:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #182033;
  --muted: #667085;
  --light: #F5F7FB;
  --line: #E4E8F2;
  --panel: #FFFFFF;
  --soft-blue: #EEF5FF;
  --radius: 28px;
  --shadow: 0 20px 60px rgba(25, 45, 90, 0.10);
}

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: #F7F9FD;
  line-height: 1.75;
  font-size: 16px;
  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(16px);
  border-bottom: 1px solid rgba(228,232,242,0.9);
}

.header-inner {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: #101828;
  white-space: nowrap;
}

.logo-img {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 10px 24px rgba(41,128,254,0.16);
}

.brand-text {
  letter-spacing: -0.02em;
}

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

.nav-toggle-label {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 14px;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  background: #fff;
}

.nav-toggle-label span {
  width: 18px;
  height: 2px;
  background: #1D2939;
  border-radius: 99px;
}

.main-nav {
  position: absolute;
  top: 68px;
  left: 14px;
  right: 14px;
  display: none;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 12px;
  box-shadow: var(--shadow);
}

.nav-toggle:checked ~ .main-nav {
  display: grid;
  gap: 6px;
}

.main-nav a {
  padding: 12px 14px;
  border-radius: 14px;
  color: #475467;
  font-size: 15px;
  font-weight: 600;
}

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

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  background: #2980FE;
  color: #fff;
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow: 0 14px 30px rgba(41,128,254,0.25);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
  background: #1768E8;
  transform: translateY(-2px);
  box-shadow: 0 18px 36px rgba(23,104,232,0.28);
}

.vpn-saas-hero {
  position: relative;
  padding: 42px 0 54px;
  color: #fff;
  background: var(--gradient);
  overflow: hidden;
}

.vpn-saas-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 70px;
  background: #F7F9FD;
  clip-path: polygon(0 58%, 100% 0, 100% 100%, 0 100%);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 32px;
  align-items: center;
}

.eyebrow,
.page-badge,
.card-tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  color: var(--blue);
  background: #EAF3FF;
}

.vpn-saas-hero .eyebrow {
  color: #fff;
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.28);
}

h1, h2, h3 {
  line-height: 1.22;
  margin: 0 0 14px;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(34px, 8vw, 64px);
}

h2 {
  font-size: clamp(27px, 5.4vw, 42px);
}

h3 {
  font-size: 21px;
}

.hero-copy p,
.section-lead,
.page-summary {
  color: #EAF0FF;
  font-size: 18px;
  margin: 0 0 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: 24px 0 18px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.hero-tags span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.22);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
}

.hero-visual {
  position: relative;
  min-height: 350px;
  display: grid;
  place-items: center;
}

.hero-device {
  width: min(420px, 92%);
  border-radius: 34px;
  background: rgba(255,255,255,0.16);
  padding: 18px;
  box-shadow: 0 34px 80px rgba(0,0,0,0.18);
  border: 1px solid rgba(255,255,255,0.2);
}

.hero-device img {
  border-radius: 26px;
  width: 100%;
  background: #fff;
}

.float-card {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 18px;
  background: rgba(255,255,255,0.92);
  color: #1D2939;
  box-shadow: 0 16px 40px rgba(20,20,80,0.18);
  font-weight: 800;
  font-size: 13px;
}

.float-card:nth-of-type(2) { top: 42px; left: 0; }
.float-card:nth-of-type(3) { top: 118px; right: 0; }
.float-card:nth-of-type(4) { bottom: 92px; left: 12px; }
.float-card:nth-of-type(5) { bottom: 36px; right: 16px; }

.section {
  padding: 54px 0;
}

.section-header {
  max-width: 760px;
  margin-bottom: 28px;
}

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

.section-header p,
.feature-copy p,
.info-card p,
.article-card p,
.faq-item p,
.step-card p,
.risk-card p,
.footer-grid p,
.text-muted {
  color: var(--muted);
  margin-top: 0;
}

.product-highlights {
  margin-top: -34px;
  position: relative;
  z-index: 2;
}

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

.highlight-card,
.info-card,
.step-card,
.risk-card,
.faq-item,
.article-card,
.tip-box,
.download-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px;
  box-shadow: 0 14px 42px rgba(25,45,90,0.06);
}

.highlight-card a,
.text-link,
.related-list a,
.footer-grid a {
  color: var(--blue);
  font-weight: 800;
}

.feature-panel {
  display: grid;
  gap: 26px;
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 32px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.feature-panel.alt {
  background: linear-gradient(180deg, #FFFFFF 0%, #F0F6FF 100%);
}

.feature-image {
  border-radius: 28px;
  background: #EEF3FF;
  padding: 16px;
  min-height: 260px;
  display: grid;
  place-items: center;
}

.feature-image img {
  width: 100%;
  border-radius: 22px;
}

.feature-list,
.clean-list,
.check-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 18px 0 18px;
  list-style: none;
}

.feature-list li,
.clean-list li,
.check-list li {
  position: relative;
  padding-left: 28px;
  color: #344054;
}

.feature-list li::before,
.clean-list li::before,
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 5px #EAF3FF;
}

.high-speed-section {
  background: #EEF4FF;
}

.global-nodes-section .node-panel {
  display: grid;
  gap: 18px;
}

.node-card {
  padding: 18px;
  border-radius: 22px;
  background: #F8FAFF;
  border: 1px solid var(--line);
}

.privacy-protection-section {
  background: #fff;
}

.privacy-grid,
.no-log-grid,
.multi-device-grid,
.protocol-grid,
.risk-grid,
.article-grid,
.info-grid {
  display: grid;
  gap: 16px;
}

.privacy-panel {
  background: linear-gradient(135deg, #FFFFFF 0%, #F5F9FF 100%);
  border: 1px solid var(--line);
  border-radius: 32px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.privacy-panel img {
  border-radius: 26px;
  margin-top: 18px;
}

.no-log-policy-section .info-card,
.encryption-protocol-section .info-card {
  border-top: 4px solid var(--blue);
}

.multi-device-section {
  background: #F7F9FD;
}

.device-showcase {
  display: grid;
  gap: 14px;
}

.device-pill {
  padding: 18px;
  border-radius: 22px;
  background: #fff;
  border: 1px solid var(--line);
  font-weight: 800;
  color: #344054;
}

.protocol-board {
  background: #111D3A;
  color: #fff;
  border-radius: 32px;
  padding: 24px;
  overflow: hidden;
  position: relative;
}

.protocol-board::before {
  content: "";
  position: absolute;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  right: -110px;
  top: -100px;
  background: rgba(41,128,254,0.28);
}

.protocol-board p {
  color: #D9E2FF;
  position: relative;
}

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

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

.step-card::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 20px;
  left: 20px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--blue);
  color: #fff;
  font-weight: 900;
}

.safety-panel {
  background: #fff;
  border-radius: 32px;
  border: 1px solid var(--line);
  padding: 24px;
  box-shadow: var(--shadow);
}

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

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.cta-section {
  padding: 60px 0;
}

.cta-box {
  text-align: center;
  color: #fff;
  border-radius: 34px;
  padding: 44px 24px;
  background: var(--gradient);
  box-shadow: 0 30px 80px rgba(53,88,242,0.22);
  overflow: hidden;
  position: relative;
}

.cta-box p {
  color: #EEF3FF;
  max-width: 720px;
  margin: 0 auto 22px;
}

.page-hero {
  padding: 46px 0 28px;
  background: linear-gradient(180deg, #F3F7FF 0%, #F7F9FD 100%);
}

.page-hero .page-summary {
  color: var(--muted);
  max-width: 780px;
}

.page-layout {
  display: grid;
  gap: 20px;
}

.article-card p {
  margin-bottom: 14px;
}

.sidebar-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 22px;
  height: fit-content;
  box-shadow: 0 14px 42px rgba(25,45,90,0.06);
}

.related-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.tip-box {
  background: #F5F9FF;
  border-color: #D8E7FF;
  margin: 18px 0;
}

.download-panel {
  text-align: center;
  margin-top: 22px;
}

.download-steps {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.download-step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 18px;
}

.site-footer {
  background: #101828;
  color: #D0D5DD;
  padding: 46px 0 22px;
}

.footer-grid {
  display: grid;
  gap: 24px;
}

.footer-brand {
  color: #fff;
  font-size: 22px;
  font-weight: 900;
  margin-bottom: 12px;
}

.footer-grid h3 {
  color: #fff;
  font-size: 17px;
}

.footer-grid a {
  display: block;
  color: #D0D5DD;
  margin: 8px 0;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  margin-top: 28px;
  padding-top: 18px;
  color: #98A2B3;
  font-size: 14px;
}

@media (min-width: 680px) {
  .highlight-grid,
  .risk-grid,
  .privacy-grid,
  .no-log-grid,
  .protocol-grid,
  .article-grid,
  .info-grid,
  .download-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .process-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .nav-toggle-label {
    display: none;
  }

  .main-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .main-nav a {
    padding: 9px 10px;
    font-size: 14px;
  }

  .vpn-saas-hero {
    padding: 74px 0 96px;
  }

  .hero-grid,
  .feature-panel,
  .privacy-grid,
  .multi-device-grid,
  .protocol-grid,
  .page-layout {
    grid-template-columns: 1.05fr .95fr;
  }

  .feature-panel.reverse .feature-copy {
    order: 2;
  }

  .feature-panel.reverse .feature-image {
    order: 1;
  }

  .highlight-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .no-log-grid,
  .risk-grid,
  .info-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .article-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .process-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1.4fr .8fr .8fr .8fr;
  }

  .section {
    padding: 78px 0;
  }

  .feature-panel,
  .privacy-panel,
  .safety-panel {
    padding: 34px;
  }
}

@media (min-width: 1120px) {
  .main-nav a {
    padding: 9px 12px;
  }
}