* {
  box-sizing: border-box;
}

:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #1f2937;
  --muted: #667085;
  --light: #f6f8fc;
  --line: #e6eaf2;
  --card: #ffffff;
  --shadow: 0 18px 50px rgba(32, 54, 98, .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: #fff;
  line-height: 1.7;
  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 14px;
  line-height: 1.25;
  color: #111827;
}

h1 {
  font-size: clamp(34px, 9vw, 62px);
  letter-spacing: -.04em;
}

h2 {
  font-size: clamp(26px, 5vw, 42px);
  letter-spacing: -.03em;
}

h3 {
  font-size: 20px;
}

.container {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(230,234,242,.88);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -.02em;
  color: #111827;
  white-space: nowrap;
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 8px 22px rgba(41,128,254,.18);
}

.nav-toggle {
  display: none;
}

.nav-toggle-label {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  display: grid;
  place-content: center;
  gap: 5px;
  cursor: pointer;
}

.nav-toggle-label span {
  display: block;
  width: 20px;
  height: 2px;
  background: #1f2937;
  border-radius: 10px;
}

.site-nav {
  position: absolute;
  top: 72px;
  left: 18px;
  right: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 14px;
  display: none;
  box-shadow: var(--shadow);
}

.nav-toggle:checked ~ .site-nav {
  display: grid;
  gap: 4px;
}

.site-nav a {
  padding: 10px 12px;
  color: #4b5563;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--blue);
  background: #eef5ff;
}

.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;
  letter-spacing: .02em;
  box-shadow: 0 12px 28px 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 18px 34px rgba(23,104,232,.32);
}

.badge,
.category-badge,
.mini-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--blue);
  background: #eef5ff;
  border: 1px solid #d8e8ff;
  font-size: 13px;
  font-weight: 800;
}

.vpn-saas-hero {
  position: relative;
  overflow: hidden;
  padding: 58px 0 72px;
  background: var(--gradient);
  isolation: isolate;
}

.vpn-saas-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 110px;
  background: #fff;
  clip-path: polygon(0 58%, 100% 18%, 100% 100%, 0 100%);
  z-index: -1;
}

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

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

.hero-copy p {
  font-size: 18px;
  opacity: .92;
  max-width: 650px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 28px;
}

.hero-tags span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.24);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  padding: 18px;
}

.product-frame {
  position: relative;
  padding: 22px;
  border-radius: 34px;
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.28);
  box-shadow: 0 30px 80px rgba(15, 23, 42, .24);
}

.product-frame img {
  border-radius: 28px;
  width: 100%;
  min-height: 250px;
  object-fit: cover;
  background: #eef5ff;
}

.float-card {
  position: absolute;
  background: rgba(255,255,255,.96);
  border: 1px solid rgba(255,255,255,.7);
  color: #1f2937;
  padding: 9px 13px;
  border-radius: 16px;
  box-shadow: 0 14px 32px rgba(15,23,42,.18);
  font-size: 13px;
  font-weight: 800;
}

.float-card.one { top: 6px; left: 4px; }
.float-card.two { top: 40px; right: 2px; }
.float-card.three { bottom: 34px; left: 0; }
.float-card.four { bottom: 6px; right: 18px; }

.section {
  padding: 72px 0;
}

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

.section-head {
  max-width: 720px;
  margin-bottom: 30px;
}

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

.product-highlights {
  margin-top: -36px;
  position: relative;
  z-index: 3;
}

.highlight-grid,
.card-grid,
.risk-grid,
.faq-grid,
.policy-grid {
  display: grid;
  gap: 18px;
}

.highlight-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.aside-card,
.check-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 24px;
  box-shadow: 0 14px 34px rgba(32,54,98,.06);
}

.highlight-card h3,
.info-card h3,
.risk-card h3,
.step-card h3 {
  font-size: 19px;
}

.link-more {
  color: var(--blue);
  font-weight: 800;
  display: inline-flex;
  margin-top: 8px;
}

.feature-panel,
.vpn-connection-section,
.high-speed-section,
.global-nodes-section,
.privacy-protection-section,
.multi-device-section,
.encryption-protocol-section,
.no-log-policy-section {
  border-radius: 34px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 26px;
  overflow: hidden;
}

.feature-split {
  display: grid;
  gap: 26px;
  align-items: center;
}

.feature-image img {
  border-radius: 28px;
  background: #eef5ff;
  width: 100%;
  min-height: 230px;
  object-fit: cover;
}

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

.point-list li,
.clean-list li {
  position: relative;
  padding-left: 28px;
  color: #4b5563;
}

.point-list li::before,
.clean-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 5px #e9f3ff;
}

.gradient-band {
  background: var(--gradient);
  color: #fff;
}

.gradient-band h2,
.gradient-band h3,
.gradient-band p,
.gradient-band li {
  color: #fff;
}

.gradient-band .link-more {
  color: #fff;
}

.gradient-band .info-card,
.gradient-band .step-card {
  background: rgba(255,255,255,.14);
  border-color: rgba(255,255,255,.24);
  color: #fff;
  box-shadow: none;
}

.privacy-wall {
  display: grid;
  gap: 18px;
}

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

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

.step-card::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  top: 20px;
  left: 24px;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: #eef5ff;
  color: var(--blue);
  display: grid;
  place-items: center;
  font-weight: 900;
}

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

.risk-card strong {
  display: block;
  color: #111827;
  margin-top: 12px;
}

.faq-item details {
  cursor: pointer;
}

.faq-item summary {
  font-weight: 900;
  color: #111827;
}

.faq-item p {
  margin-top: 12px;
}

.cta-section {
  padding: 76px 0;
  text-align: center;
  background: var(--gradient);
  color: #fff;
  overflow: hidden;
  position: relative;
}

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

.cta-section p {
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

.page-hero {
  padding: 58px 0 44px;
  background: linear-gradient(180deg, #f5f8ff 0%, #fff 100%);
}

.page-hero-inner {
  display: grid;
  gap: 18px;
  max-width: 850px;
}

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

.article-body {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.article-body h2 {
  font-size: 26px;
  margin-top: 26px;
}

.article-body h2:first-child {
  margin-top: 0;
}

.aside-stack {
  display: grid;
  gap: 16px;
}

.aside-card a {
  display: block;
  padding: 8px 0;
  color: var(--blue);
  font-weight: 800;
}

.check-grid {
  display: grid;
  gap: 14px;
  margin: 20px 0;
}

.number-list {
  padding-left: 20px;
  color: #4b5563;
}

.number-list li {
  margin-bottom: 10px;
}

.download-panel {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 34px;
  padding: 34px 24px;
  box-shadow: var(--shadow);
}

.single-download-box {
  margin: 26px 0;
}

.site-footer {
  background: #101828;
  color: #d0d5dd;
  padding: 56px 0 26px;
}

.site-footer p,
.site-footer a,
.site-footer span {
  color: #cbd5e1;
}

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

.footer-brand {
  color: #fff;
  font-weight: 900;
  font-size: 20px;
  margin-bottom: 12px;
}

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

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

.footer-bottom {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.12);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

@media (min-width: 680px) {
  .highlight-grid,
  .card-grid,
  .risk-grid,
  .faq-grid,
  .policy-grid,
  .check-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 980px) {
  .nav-toggle-label {
    display: none;
  }

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

  .site-nav a {
    font-size: 14px;
  }

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

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

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

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

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

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

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 310px;
  }

  .footer-grid {
    grid-template-columns: 1.4fr repeat(3, 1fr);
  }

  .footer-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .vpn-saas-hero {
    padding: 86px 0 112px;
  }

  .feature-panel,
  .vpn-connection-section,
  .high-speed-section,
  .global-nodes-section,
  .privacy-protection-section,
  .multi-device-section,
  .encryption-protocol-section,
  .no-log-policy-section {
    padding: 38px;
  }
}

@media (max-width: 420px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

  .download-btn {
    width: 100%;
  }

  .float-card {
    position: static;
    display: inline-flex;
    margin: 8px 6px 0 0;
  }
}