:root {
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #1f2a37;
  --muted: #667085;
  --line: #e6eaf2;
  --soft: #f5f8fc;
  --soft-blue: #eef4ff;
  --white: #ffffff;
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --shadow: 0 18px 45px rgba(43, 67, 133, 0.12);
  --radius: 28px;
}
* { 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: #fff;
  line-height: 1.72;
  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;
}
.narrow-container { max-width: 860px; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(230,234,242,0.9);
}
.header-inner {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: #111827; }
.logo { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.site-nav {
  position: absolute;
  left: 14px;
  right: 14px;
  top: 72px;
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #475467;
  font-size: 15px;
}
.site-nav a.active, .site-nav a:hover { color: var(--blue); background: var(--soft-blue); }
.nav-toggle {
  width: 42px;
  height: 42px;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}
.nav-toggle span { width: 18px; height: 2px; background: #111827; margin: 0 auto; border-radius: 2px; }
.gradient-bg { background: var(--gradient); }
.vpn-saas-hero {
  position: relative;
  color: #fff;
  overflow: hidden;
  padding: 56px 0 80px;
}
.vpn-saas-hero:after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 70px;
  background: #fff;
  clip-path: polygon(0 55%, 100% 0, 100% 100%, 0 100%);
}
.hero-grid { position: relative; z-index: 2; display: grid; gap: 34px; align-items: center; }
.eyebrow, .section-kicker, .badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.eyebrow { color: #fff; background: rgba(255,255,255,0.18); border: 1px solid rgba(255,255,255,0.22); }
.section-kicker, .badge { color: var(--blue); background: var(--soft-blue); }
h1, h2, h3 { line-height: 1.18; margin: 0 0 14px; color: #111827; }
.vpn-saas-hero h1 { color: #fff; font-size: clamp(34px, 9vw, 64px); letter-spacing: -0.04em; margin-top: 18px; }
.vpn-saas-hero p { color: rgba(255,255,255,0.88); font-size: 17px; max-width: 650px; margin: 0 0 24px; }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  font-size: 16px;
  box-shadow: 0 12px 24px 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 30px rgba(23, 104, 232, 0.28); }
.trust-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.trust-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,0.16); color: #fff; font-size: 13px; }
.hero-visual {
  position: relative;
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual:before {
  content: "";
  position: absolute;
  width: 92%;
  height: 84%;
  border-radius: 36px;
  background: rgba(255,255,255,0.16);
  transform: rotate(-5deg);
}
.hero-visual img {
  position: relative;
  max-height: 420px;
  object-fit: contain;
  filter: drop-shadow(0 28px 34px rgba(11,21,62,0.22));
}
.float-card {
  position: absolute;
  z-index: 3;
  padding: 10px 13px;
  border-radius: 15px;
  background: rgba(255,255,255,0.92);
  color: #253047;
  font-weight: 700;
  font-size: 13px;
  box-shadow: var(--shadow);
}
.card-one { top: 24px; left: 4%; }
.card-two { top: 24%; right: 2%; }
.card-three { left: 0; bottom: 18%; }
.card-four { right: 7%; bottom: 8%; }
.section-space { padding: 70px 0; }
.soft-bg { background: var(--soft); }
.section-heading { max-width: 760px; margin-bottom: 28px; }
.section-heading.centered { text-align: center; margin-left: auto; margin-right: auto; }
.section-heading h2, .text-block h2, .cta-inner h2 { font-size: clamp(28px, 6vw, 42px); letter-spacing: -0.03em; }
.section-heading p, .text-block p, .article-main p, .compact-hero p { color: var(--muted); margin: 0 0 18px; }
.highlight-grid { display: grid; gap: 16px; }
.highlight-card, .guide-cards article, .policy-grid article, .privacy-grid article, .risk-grid article, .steps-grid article, .side-card, .notice-card, .summary-box, .faq-item, .faq-list details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 12px 30px rgba(36, 48, 82, 0.06);
}
.highlight-card { padding: 22px; }
.highlight-card span { color: var(--blue); font-weight: 900; }
.highlight-card h3 { margin-top: 12px; }
.highlight-card p { color: var(--muted); margin: 0 0 16px; }
.highlight-card a, .text-link, .steps-grid a, .risk-grid a, .side-card a { color: var(--blue); font-weight: 800; }
.split-panel, .feature-wide, .protocol-panel, .article-layout { display: grid; gap: 28px; align-items: center; }
.text-block { min-width: 0; }
.check-list, .number-list { margin: 18px 0 20px; padding-left: 20px; color: #344054; }
.check-list li, .number-list li { margin: 8px 0; }
.image-card {
  background: linear-gradient(180deg, #fff, #f2f6ff);
  border: 1px solid var(--line);
  border-radius: 32px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.image-card img { width: 100%; max-height: 420px; object-fit: contain; margin: 0 auto; }
.speed-card { background: linear-gradient(180deg, #ffffff, #eef4ff); }
.mini-metrics, .info-strip { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0 18px; }
.mini-metrics span, .info-strip span {
  padding: 10px 12px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
  color: #344054;
  font-weight: 700;
  font-size: 14px;
}
.privacy-panel, .protocol-panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 36px;
  background: #fff;
  box-shadow: var(--shadow);
}
.privacy-grid { display: grid; gap: 16px; }
.privacy-grid article { padding: 18px; }
.privacy-grid img { align-self: center; justify-self: center; max-height: 320px; object-fit: contain; }
.policy-grid, .steps-grid, .risk-grid, .guide-cards, .protocol-cards { display: grid; gap: 16px; }
.policy-grid article, .steps-grid article, .guide-cards article, .protocol-cards article { padding: 20px; }
.center-action, .single-action { text-align: center; margin-top: 24px; }
.device-stack { background: linear-gradient(135deg, #fff, #edf3ff); }
.protocol-panel { position: relative; overflow: hidden; }
.protocol-panel img { max-height: 280px; object-fit: contain; margin: 18px auto 0; }
.protocol-cards article { border-left: 4px solid var(--blue); }
.protocol-cards strong { display: block; color: #111827; margin-bottom: 6px; }
.protocol-cards span { color: var(--muted); }
.steps-grid article span { display: inline-flex; color: var(--blue); font-weight: 900; margin-bottom: 10px; }
.risk-grid article { padding: 20px; border-left: 4px solid var(--blue); }
.risk-grid p { color: var(--muted); margin: 0 0 10px; }
.risk-grid strong { display: inline-block; margin-right: 4px; }
.risk-grid span { color: #475467; }
.risk-grid a { display: block; margin-top: 12px; }
.faq-list { display: grid; gap: 14px; }
.faq-list details, .faq-item { padding: 18px 20px; }
.faq-list summary { cursor: pointer; font-weight: 800; color: #111827; }
.faq-list p { color: var(--muted); margin: 12px 0 0; }
.cta-section { color: #fff; text-align: center; }
.cta-inner { max-width: 760px; }
.cta-inner h2 { color: #fff; }
.cta-inner p { color: rgba(255,255,255,0.86); margin: 0 0 22px; }
.page-hero {
  background: linear-gradient(135deg, #f2f6ff 0%, #ffffff 58%, #f7efff 100%);
  padding: 54px 0;
  border-bottom: 1px solid var(--line);
}
.compact-hero h1 { font-size: clamp(34px, 8vw, 56px); letter-spacing: -0.04em; margin-top: 18px; }
.article-layout { align-items: start; }
.article-main {
  min-width: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: 22px;
  box-shadow: 0 12px 30px rgba(36, 48, 82, 0.05);
}
.article-main h2 { font-size: 25px; margin-top: 20px; }
.article-main h2:first-child { margin-top: 0; }
.summary-box, .notice-card { padding: 18px; margin-bottom: 20px; background: var(--soft-blue); }
.summary-box p, .notice-card p { margin-bottom: 0; }
.guide-cards { margin: 20px 0; }
.side-card { padding: 20px; display: grid; gap: 10px; }
.side-card ul { margin: 0; padding-left: 20px; color: var(--muted); }
.side-card a { padding: 10px 12px; border-radius: 14px; background: var(--soft-blue); }
.site-footer { background: #111827; color: #d0d5dd; padding: 42px 0; }
.footer-inner { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; gap: 24px; }
.footer-brand { display: flex; gap: 14px; align-items: center; }
.footer-logo { width: 42px; height: 42px; border-radius: 14px; object-fit: cover; }
.footer-brand strong { color: #fff; font-size: 20px; }
.footer-brand p, .footer-note { margin: 4px 0 0; color: #98a2b3; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px 18px; }
.footer-links a { color: #e4e7ec; }
.footer-links a:hover { color: #fff; }
@media (min-width: 700px) {
  .highlight-grid { grid-template-columns: repeat(2, 1fr); }
  .privacy-grid { grid-template-columns: repeat(3, 1fr); }
  .privacy-grid img { grid-column: 1 / -1; }
  .policy-grid, .steps-grid, .risk-grid, .guide-cards, .protocol-cards { grid-template-columns: repeat(2, 1fr); }
  .article-main { padding: 30px; }
}
@media (min-width: 980px) {
  .nav-toggle { display: none; }
  .site-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 2px;
    padding: 0;
    border: 0;
    box-shadow: none;
    background: transparent;
  }
  .site-nav a { font-size: 14px; }
  .vpn-saas-hero { padding: 76px 0 105px; }
  .hero-grid { grid-template-columns: 1.05fr .95fr; }
  .highlight-grid { grid-template-columns: repeat(4, 1fr); }
  .split-panel, .feature-wide { grid-template-columns: 1fr 1fr; gap: 56px; }
  .feature-wide.reverse .image-card { order: -1; }
  .privacy-panel { padding: 36px; }
  .privacy-grid { grid-template-columns: repeat(3, 1fr) 1.25fr; align-items: stretch; }
  .privacy-grid img { grid-column: auto; }
  .policy-grid { grid-template-columns: repeat(3, 1fr); }
  .steps-grid { grid-template-columns: repeat(3, 1fr); }
  .risk-grid { grid-template-columns: repeat(4, 1fr); }
  .protocol-panel { grid-template-columns: .95fr 1fr .85fr; }
  .article-layout { grid-template-columns: minmax(0, 1fr) 310px; }
}
@media (max-width: 420px) {
  .container { width: min(100% - 24px, 1120px); }
  .section-space { padding: 54px 0; }
  .download-btn { width: 100%; min-height: 52px; }
  .hero-visual { min-height: 310px; }
  .float-card { font-size: 12px; padding: 8px 10px; }
  .article-main { padding: 18px; border-radius: 24px; }
}