* {
  box-sizing: border-box;
}

:root {
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --text: #182033;
  --muted: #667085;
  --light: #F4F7FB;
  --panel: #FFFFFF;
  --border: #E5EAF3;
  --soft-blue: #EDF5FF;
  --shadow: 0 18px 50px rgba(22, 38, 80, 0.09);
  --radius: 28px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: #F8FAFD;
  line-height: 1.72;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: min(100% - 32px, 1160px);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(229, 234, 243, 0.8);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #111827;
  white-space: nowrap;
}

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

.site-nav {
  display: none;
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  padding: 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.site-nav a {
  display: block;
  padding: 11px 12px;
  color: #455066;
  font-size: 15px;
  border-radius: 14px;
}

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

.site-nav .nav-download {
  background: var(--blue);
  color: #fff;
  text-align: center;
  margin-top: 8px;
}

.site-nav .nav-download:hover {
  background: var(--blue-dark);
  color: #fff;
}

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

.nav-toggle-label {
  width: 42px;
  height: 42px;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
}

.nav-toggle-label span {
  display: block;
  height: 2px;
  background: #1F2937;
  border-radius: 99px;
}

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

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 26px;
  background: var(--blue);
  color: #fff;
  font-weight: 750;
  border-radius: 999px;
  border: 0;
  box-shadow: 0 12px 28px rgba(41, 128, 254, 0.26);
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
  background: var(--blue-dark);
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(23, 104, 232, 0.28);
}

.section {
  padding: 72px 0;
}

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

.section-title {
  max-width: 760px;
  margin: 0 auto 34px;
  text-align: center;
}

.section-title .badge,
.page-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--soft-blue);
  color: var(--blue);
  font-size: 13px;
  font-weight: 750;
}

.section-title h2,
.page-title h1,
.hero-copy h1 {
  margin: 12px 0 12px;
  line-height: 1.18;
  letter-spacing: -0.04em;
}

.section-title h2 {
  font-size: clamp(28px, 4vw, 42px);
}

.section-title p,
.page-title p,
.hero-copy p,
.feature-copy p,
.card p {
  color: var(--muted);
}

.vpn-saas-hero {
  position: relative;
  overflow: hidden;
  padding: 42px 0 70px;
  background: var(--gradient);
  color: #fff;
}

.vpn-saas-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: -72px;
  height: 160px;
  background: #F8FAFD;
  transform: skewY(-4deg);
  transform-origin: left top;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(36px, 7vw, 64px);
  max-width: 720px;
}

.hero-copy p {
  color: rgba(255, 255, 255, 0.86);
  font-size: 17px;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin: 24px 0;
}

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

.hero-tags span,
.status-tags span,
.small-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.22);
  font-size: 13px;
}

.hero-visual {
  position: relative;
  min-height: 360px;
  padding: 24px;
  border-radius: 36px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 28px 70px rgba(9, 16, 35, 0.22);
}

.hero-visual img {
  width: min(420px, 86%);
  margin: 12px auto;
  filter: drop-shadow(0 26px 40px rgba(0, 0, 0, 0.22));
}

.float-card {
  position: absolute;
  padding: 12px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.94);
  color: #1F2937;
  box-shadow: 0 18px 40px rgba(18, 26, 49, 0.18);
  font-weight: 750;
  font-size: 14px;
}

.float-card small {
  display: block;
  color: var(--muted);
  font-weight: 500;
  margin-top: 2px;
}

.float-card.one { left: 16px; top: 24px; }
.float-card.two { right: 18px; top: 88px; }
.float-card.three { left: 28px; bottom: 32px; }
.float-card.four { right: 22px; bottom: 44px; }

.product-highlights,
.card-grid,
.risk-grid,
.faq-grid,
.step-grid,
.policy-grid,
.device-grid,
.protocol-grid,
.info-grid {
  display: grid;
  gap: 18px;
}

.product-highlights {
  margin-top: -34px;
  position: relative;
  z-index: 3;
}

.card,
.highlight-card,
.info-card,
.faq-item,
.step-card,
.risk-card,
.notice-panel,
.feature-panel,
.page-panel,
.sidebar-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 32px rgba(26, 37, 74, 0.06);
}

.highlight-card,
.info-card,
.step-card,
.risk-card,
.faq-item,
.sidebar-card {
  padding: 22px;
}

.highlight-card .tag,
.info-card .tag,
.risk-card .tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  background: var(--soft-blue);
  color: var(--blue);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.highlight-card h3,
.info-card h3,
.step-card h3,
.risk-card h3,
.faq-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.text-link {
  display: inline-flex;
  margin-top: 10px;
  color: var(--blue);
  font-weight: 750;
}

.feature-panel {
  padding: 24px;
  overflow: hidden;
}

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

.feature-copy h2 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
  margin: 0 0 14px;
  letter-spacing: -0.035em;
}

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

.feature-list li,
.clean-list li,
.check-list li {
  position: relative;
  padding-left: 26px;
  color: #4B5563;
}

.feature-list li::before,
.clean-list li::before,
.check-list li::before {
  content: "";
  width: 9px;
  height: 9px;
  position: absolute;
  left: 3px;
  top: 11px;
  background: var(--blue);
  border-radius: 50%;
}

.feature-media {
  background: linear-gradient(180deg, #F7FAFF 0%, #EEF4FF 100%);
  border-radius: 30px;
  padding: 20px;
  border: 1px solid var(--border);
}

.feature-media img {
  margin: 0 auto;
  max-height: 390px;
  object-fit: contain;
}

.high-speed-section .feature-panel,
.global-nodes-section .feature-panel,
.multi-device-section .feature-panel {
  background: linear-gradient(180deg, #FFFFFF 0%, #F7FAFF 100%);
}

.privacy-protection-section .privacy-panel {
  padding: 28px;
  border-radius: 32px;
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.privacy-layout {
  display: grid;
  gap: 24px;
}

.privacy-card-row {
  display: grid;
  gap: 16px;
}

.no-log-policy-section .policy-grid,
.protocol-grid,
.device-grid {
  grid-template-columns: 1fr;
}

.process-steps {
  counter-reset: step;
}

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

.step-number {
  position: absolute;
  left: 22px;
  top: 18px;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
}

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

.cta-section {
  padding: 72px 0;
}

.cta-panel {
  text-align: center;
  padding: 42px 24px;
  color: #fff;
  background: var(--gradient);
  border-radius: 36px;
  position: relative;
  overflow: hidden;
}

.cta-panel::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -80px;
  top: -80px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 50%;
}

.cta-panel h2 {
  margin: 0 0 12px;
  font-size: clamp(28px, 4vw, 42px);
}

.cta-panel p {
  margin: 0 auto 22px;
  max-width: 680px;
  color: rgba(255, 255, 255, 0.86);
}

.page-hero {
  padding: 58px 0 38px;
  background: linear-gradient(180deg, #FFFFFF 0%, #F3F7FF 100%);
}

.page-title {
  max-width: 840px;
}

.page-title h1 {
  font-size: clamp(34px, 6vw, 58px);
}

.page-content {
  padding: 44px 0 76px;
}

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

.page-panel {
  padding: 24px;
}

.page-panel h2 {
  margin-top: 0;
  font-size: 26px;
}

.page-panel p {
  color: #4B5563;
}

.sidebar {
  display: grid;
  gap: 16px;
}

.sidebar-card h3 {
  margin-top: 0;
}

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

.steps-list .step-line {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
}

.steps-list .num {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--soft-blue);
  color: var(--blue);
  font-weight: 850;
}

.faq-list {
  display: grid;
  gap: 16px;
}

.faq-item p {
  margin-bottom: 0;
}

.download-card {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
  padding: 32px 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 32px;
  box-shadow: var(--shadow);
}

.download-card h1 {
  margin-top: 0;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.18;
}

.site-footer {
  background: #111827;
  color: rgba(255,255,255,0.78);
  padding: 52px 0 24px;
}

.footer-grid {
  display: grid;
  gap: 26px;
}

.footer-brand {
  color: #fff;
  font-size: 22px;
  font-weight: 850;
  margin-bottom: 10px;
}

.site-footer h3 {
  color: #fff;
  margin: 0 0 12px;
  font-size: 16px;
}

.site-footer a {
  display: block;
  color: rgba(255,255,255,0.72);
  margin: 8px 0;
}

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

.footer-bottom {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: rgba(255,255,255,0.58);
  font-size: 14px;
}

@media (min-width: 720px) {
  .product-highlights,
  .card-grid,
  .risk-grid,
  .faq-grid,
  .step-grid,
  .privacy-card-row,
  .info-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }

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

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

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

  .site-nav a {
    padding: 8px 10px;
    font-size: 14px;
  }

  .site-nav .nav-download {
    margin: 0 0 0 6px;
    padding: 9px 16px;
  }

  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
  }

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

  .feature-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .feature-grid.reverse .feature-media {
    order: 1;
  }

  .privacy-layout {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

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

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

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

  .page-panel {
    padding: 34px;
  }
}

@media (min-width: 1160px) {
  .site-nav a {
    padding: 9px 13px;
  }
}