:root {
  --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #1f2937;
  --muted: #64748b;
  --light: #f6f8fc;
  --line: #e5eaf3;
  --panel: #ffffff;
  --shadow: 0 18px 45px rgba(31, 41, 55, .10);
  --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: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; 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,.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226,232,240,.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: flex; align-items: center; gap: 10px; font-weight: 800; color: #13213a; }
.logo-img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 18px rgba(41,128,254,.18); }
.brand-text { font-size: 18px; letter-spacing: .4px; }
.nav-toggle {
  border: 1px solid var(--line);
  background: #fff;
  color: #20314f;
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 14px;
}
.site-nav {
  display: none;
  position: absolute;
  top: 68px;
  left: 14px;
  right: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 12px;
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; gap: 6px; }
.site-nav a { padding: 10px 12px; border-radius: 14px; color: #475569; font-size: 15px; }
.site-nav a:hover { color: var(--blue); background: #f0f6ff; }
.gradient-bg { background: var(--brand-gradient); }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 26px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 25px rgba(41,128,254,.30);
  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,.32); }
.section { padding: 64px 0; }
.section-soft { background: var(--light); }
.section-title { max-width: 760px; margin: 0 auto 28px; text-align: center; }
.section-title .eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 5px 12px;
  background: #eef6ff;
  color: var(--blue);
  font-weight: 800;
  font-size: 13px;
  margin-bottom: 10px;
}
.section-title h2, .section-title h1 { margin: 0 0 12px; line-height: 1.2; color: #12213a; }
.section-title p { margin: 0; color: var(--muted); }
.vpn-saas-hero {
  position: relative;
  padding: 42px 0 56px;
  background: var(--brand-gradient);
  color: #fff;
  overflow: hidden;
}
.vpn-saas-hero::after {
  content: "";
  position: absolute;
  left: -10%; right: -10%; bottom: -70px;
  height: 140px;
  background: #fff;
  transform: rotate(-3deg);
  transform-origin: left top;
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
  align-items: center;
}
.hero-copy h1 { font-size: clamp(34px, 9vw, 62px); line-height: 1.08; margin: 0 0 18px; letter-spacing: -1.5px; }
.hero-copy p { color: rgba(255,255,255,.88); font-size: 17px; margin: 0 0 22px; }
.hero-tags, .mini-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span, .mini-tags span {
  border: 1px solid rgba(255,255,255,.30);
  background: rgba(255,255,255,.12);
  color: #fff;
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 13px;
}
.hero-visual { position: relative; min-height: 320px; }
.product-frame {
  position: relative;
  max-width: 420px;
  margin: 0 auto;
  padding: 22px;
  border-radius: 36px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.22);
  box-shadow: 0 30px 70px rgba(0,0,0,.20);
}
.product-frame img { border-radius: 26px; background: rgba(255,255,255,.22); }
.float-card {
  position: absolute;
  z-index: 2;
  background: rgba(255,255,255,.95);
  color: #1f2a44;
  border-radius: 18px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 14px 28px rgba(31,41,55,.16);
}
.float-card.one { top: 16px; left: 2px; }
.float-card.two { top: 88px; right: -4px; }
.float-card.three { bottom: 74px; left: -5px; }
.float-card.four { bottom: 12px; right: 20px; }
.product-highlights { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: -18px; position: relative; z-index: 2; }
.highlight-card, .card, .faq-item, .risk-card, .step-card, .info-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px;
  box-shadow: 0 12px 32px rgba(31,41,55,.06);
}
.highlight-card .tag { display: inline-block; color: var(--blue); font-weight: 800; font-size: 13px; margin-bottom: 8px; }
.highlight-card h3, .card h3, .risk-card h3, .step-card h3, .info-card h3 { margin: 0 0 8px; color: #14213d; line-height: 1.3; }
.highlight-card p, .card p, .risk-card p, .step-card p, .info-card p { margin: 0 0 12px; color: var(--muted); }
.text-link { color: var(--blue); font-weight: 800; }
.feature-split, .vpn-connection-section, .high-speed-section, .global-nodes-section, .multi-device-section, .encryption-protocol-section {
  display: grid;
  gap: 28px;
  align-items: center;
}
.feature-copy h2 { font-size: clamp(26px, 6vw, 40px); line-height: 1.18; margin: 0 0 14px; color: #12213a; }
.feature-copy p { color: var(--muted); margin: 0 0 14px; }
.feature-list { list-style: none; padding: 0; margin: 18px 0; display: grid; gap: 10px; }
.feature-list li { position: relative; padding-left: 24px; color: #42526b; }
.feature-list li::before { content: ""; position: absolute; left: 0; top: .75em; width: 9px; height: 9px; border-radius: 50%; background: var(--blue); }
.visual-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 34px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.visual-card img { border-radius: 24px; margin: 0 auto; }
.speed-panel { background: linear-gradient(180deg, #f8fbff, #ffffff); }
.node-panel { background: #fff; }
.privacy-protection-section .privacy-panel {
  display: grid;
  gap: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 34px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.privacy-cards, .no-log-policy-section, .protocol-grid, .about-grid, .download-steps, .guide-grid { display: grid; gap: 16px; }
.no-log-policy-section .info-card { border-top: 4px solid var(--blue); }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-top: 48px; }
.step-card::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 18px; left: 22px;
  color: var(--blue);
  font-weight: 900;
  letter-spacing: .08em;
}
.risk-grid { display: grid; gap: 16px; }
.risk-card { border-left: 4px solid var(--blue); }
.faq-list { display: grid; gap: 14px; max-width: 920px; margin: 0 auto; }
.faq-item h3 { margin: 0 0 8px; color: #12213a; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
  padding: 62px 0;
  background: var(--brand-gradient);
  color: #fff;
  text-align: center;
  border-radius: 36px;
  width: min(1120px, calc(100% - 32px));
  margin: 40px auto;
  position: relative;
  overflow: hidden;
}
.cta-section h2 { margin: 0 0 12px; font-size: clamp(26px, 7vw, 42px); }
.cta-section p { max-width: 680px; margin: 0 auto 22px; color: rgba(255,255,255,.86); }
.page-hero {
  background: linear-gradient(180deg, #f4f7ff 0%, #fff 100%);
  padding: 52px 0 28px;
}
.page-hero h1 { font-size: clamp(30px, 8vw, 48px); line-height: 1.18; margin: 0 0 12px; color: #12213a; }
.page-hero p { max-width: 760px; color: var(--muted); margin: 0; }
.content-layout { display: grid; gap: 24px; align-items: start; }
.article-panel { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: 0 14px 34px rgba(31,41,55,.05); }
.article-panel h2 { margin-top: 0; color: #12213a; }
.article-panel p { color: var(--muted); }
.side-panel { background: #f8fbff; border: 1px solid var(--line); border-radius: 24px; padding: 20px; }
.side-panel a { display: block; color: var(--blue); font-weight: 800; margin: 8px 0; }
.check-list { list-style: none; padding: 0; margin: 14px 0; display: grid; gap: 10px; }
.check-list li { background: #f8fbff; border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; color: #42526b; }
.download-page-box { text-align: center; max-width: 820px; margin: 0 auto; }
.site-footer { background: #0f172a; color: #cbd5e1; padding-top: 54px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { color: #fff; font-weight: 900; font-size: 22px; margin-bottom: 10px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; color: #cbd5e1; margin: 7px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 34px; padding: 18px; text-align: center; border-top: 1px solid rgba(255,255,255,.10); color: #94a3b8; font-size: 14px; }
@media (min-width: 720px) {
  .product-highlights { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .privacy-cards, .protocol-grid, .about-grid, .download-steps, .guide-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .risk-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}
@media (min-width: 980px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
  .site-nav a { font-size: 14px; }
  .hero-grid { grid-template-columns: 1.04fr .96fr; }
  .product-highlights { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .feature-split, .vpn-connection-section, .high-speed-section, .global-nodes-section, .multi-device-section, .encryption-protocol-section { grid-template-columns: 1fr 1fr; }
  .privacy-protection-section .privacy-panel { grid-template-columns: 1.05fr .95fr; padding: 34px; }
  .privacy-cards, .no-log-policy-section, .protocol-grid, .about-grid, .download-steps, .guide-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .risk-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .content-layout { grid-template-columns: minmax(0, 1fr) 300px; }
  .article-panel { padding: 34px; }
  .section { padding: 86px 0; }
}