* {
  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: #263244;
  background: #f6f8fc;
  line-height: 1.75;
  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 {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid #e6eaf2;
  backdrop-filter: blur(14px);
}

.header-inner {
  width: min(1180px, calc(100% - 28px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo,
.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: #17233f;
  letter-spacing: 0.03em;
}

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

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

.mobile-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 14px;
  border: 1px solid #d7deea;
  border-radius: 999px;
  color: #43526b;
  background: #fff;
  cursor: pointer;
}

.desktop-nav {
  display: none;
  position: absolute;
  left: 14px;
  right: 14px;
  top: 70px;
  padding: 14px;
  background: #fff;
  border: 1px solid #e1e6f0;
  border-radius: 22px;
  box-shadow: 0 18px 40px rgba(28, 45, 84, 0.12);
}

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

.desktop-nav a {
  padding: 10px 12px;
  color: #46556d;
  border-radius: 14px;
  font-size: 15px;
}

.desktop-nav a:hover,
.desktop-nav a.active {
  color: #1d5fe8;
  background: #eef5ff;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 24px;
  border-radius: 999px;
  background: #2980FE;
  color: #fff;
  font-weight: 800;
  letter-spacing: 0.02em;
  border: 0;
  box-shadow: 0 14px 26px rgba(41, 128, 254, 0.24);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
  background: #1768E8;
  transform: translateY(-2px);
  box-shadow: 0 18px 32px rgba(23, 104, 232, 0.28);
}

.gradient-bg,
.vpn-lab-hero,
.cta-section {
  background: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
}

.vpn-lab-hero {
  position: relative;
  padding: 74px 0 64px;
  color: #fff;
  overflow: hidden;
}

.vpn-lab-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -28% -10%;
  height: 280px;
  background: rgba(255,255,255,0.16);
  filter: blur(50px);
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 38px;
  align-items: center;
}

.eyebrow,
.badge {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.16);
  border: 1px solid rgba(255,255,255,0.28);
  color: inherit;
  font-size: 13px;
  font-weight: 700;
}

.page-hero .badge,
.article-hero .badge,
.light-badge {
  color: #2980FE;
  background: #eef5ff;
  border: 1px solid #d9e8ff;
}

.vpn-lab-hero h1,
.page-hero h1,
.article-hero h1 {
  margin: 18px 0 16px;
  font-size: clamp(34px, 7vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.05em;
}

.vpn-lab-hero p {
  max-width: 620px;
  margin: 0 0 22px;
  color: rgba(255,255,255,0.88);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 22px 0;
}

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

.hero-tags span,
.tag-row span,
.soft-tag {
  display: inline-flex;
  align-items: center;
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.24);
  font-size: 13px;
}

.visual-panel {
  position: relative;
  min-height: 360px;
  display: grid;
  place-items: center;
}

.product-card {
  position: relative;
  width: min(420px, 100%);
  padding: 22px;
  border-radius: 34px;
  background: rgba(255,255,255,0.92);
  box-shadow: 0 32px 70px rgba(31, 24, 91, 0.26);
}

.product-card img {
  width: 100%;
  border-radius: 26px;
}

.status-pill {
  position: absolute;
  padding: 9px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.96);
  color: #25324a;
  border: 1px solid #edf1f7;
  box-shadow: 0 14px 32px rgba(34, 44, 78, 0.15);
  font-size: 13px;
  font-weight: 800;
}

.status-pill.one { top: 18px; left: -6px; }
.status-pill.two { top: 72px; right: -8px; }
.status-pill.three { bottom: 72px; left: -10px; }
.status-pill.four { bottom: 18px; right: 16px; }

section {
  padding: 62px 0;
}

.section-title {
  margin-bottom: 28px;
}

.section-title h2,
.content-block h2,
.article-section h2 {
  margin: 0 0 12px;
  color: #17233f;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.section-title p,
.content-block p,
.article-hero p,
.article-section p,
.page-hero p {
  color: #617089;
  margin: 0 0 14px;
}

.privacy-summary {
  margin-top: -36px;
  position: relative;
  z-index: 4;
  padding-top: 0;
}

.summary-grid,
.card-grid,
.risk-grid,
.faq-grid,
.feature-grid {
  display: grid;
  gap: 18px;
}

.summary-card,
.security-card,
.risk-card,
.faq-item,
.feature-card,
.step-card,
.note-card,
.tip-box,
.article-card {
  background: #fff;
  border: 1px solid #e4e9f3;
  border-radius: 24px;
  padding: 22px;
  box-shadow: 0 12px 30px rgba(42, 55, 94, 0.06);
}

.summary-card strong,
.security-card h3,
.risk-card h3,
.feature-card h3,
.step-card h3,
.note-card h3,
.article-card h3,
.faq-item h3 {
  display: block;
  margin: 0 0 8px;
  color: #17233f;
  font-size: 19px;
}

.summary-card em {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 5px 10px;
  border-radius: 999px;
  color: #2980FE;
  background: #eef5ff;
  font-style: normal;
  font-size: 12px;
  font-weight: 800;
}

.text-link {
  display: inline-flex;
  margin-top: 8px;
  color: #2980FE;
  font-weight: 800;
}

.split-section,
.vpn-connection-section,
.global-nodes-section,
.high-speed-section,
.multi-device-section {
  display: grid;
  gap: 28px;
  align-items: center;
}

.image-shell {
  padding: 16px;
  background: #fff;
  border: 1px solid #e5eaf4;
  border-radius: 32px;
  box-shadow: 0 16px 38px rgba(35, 48, 82, 0.08);
}

.image-shell img {
  border-radius: 24px;
  width: 100%;
}

.point-list,
.check-list,
.clean-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.point-list li,
.check-list li,
.clean-list li {
  position: relative;
  padding-left: 24px;
  color: #53627a;
}

.point-list li::before,
.check-list li::before,
.clean-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2980FE;
}

.privacy-protection-section,
.no-log-policy-section,
.encryption-protocol-section {
  background: #fff;
}

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

.safety-panel {
  background: linear-gradient(180deg, #ffffff 0%, #f4f8ff 100%);
  border: 1px solid #dfe8f8;
  border-radius: 30px;
  padding: 26px;
  box-shadow: 0 18px 38px rgba(41, 128, 254, 0.08);
}

.safety-panel .tag-row span {
  background: #eef5ff;
  border-color: #d9e8ff;
  color: #2980FE;
}

.no-log-grid,
.protocol-grid {
  display: grid;
  gap: 16px;
}

.high-speed-section-wrap {
  background: #eef4fb;
}

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

.step-card {
  position: relative;
  padding-top: 26px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: #2980FE;
  color: #fff;
  font-weight: 900;
}

.risk-card {
  border-left: 4px solid #2980FE;
}

.faq-item p,
.risk-card p,
.summary-card p,
.security-card p,
.feature-card p,
.step-card p,
.note-card p,
.article-card p {
  margin: 0;
  color: #62718a;
}

.cta-section {
  color: #fff;
  text-align: center;
  border-radius: 34px;
  width: min(1120px, calc(100% - 32px));
  margin: 44px auto 68px;
  padding: 50px 18px;
}

.cta-section h2 {
  margin: 0 0 12px;
  font-size: clamp(26px, 5vw, 42px);
}

.cta-section p {
  max-width: 720px;
  margin: 0 auto 22px;
  color: rgba(255,255,255,0.86);
}

.page-hero,
.article-hero {
  padding: 56px 0 28px;
  background: linear-gradient(180deg, #f8fbff 0%, #f6f8fc 100%);
}

.page-hero h1,
.article-hero h1 {
  color: #17233f;
}

.page-layout,
.article-layout {
  display: grid;
  gap: 22px;
  align-items: start;
  padding: 28px 0 64px;
}

.article-main,
.page-main {
  display: grid;
  gap: 18px;
}

.article-section {
  background: #fff;
  border: 1px solid #e4e9f3;
  border-radius: 28px;
  padding: 26px;
  box-shadow: 0 12px 30px rgba(42, 55, 94, 0.05);
}

.side-panel {
  display: grid;
  gap: 16px;
}

.side-panel .note-card {
  position: sticky;
  top: 96px;
}

.download-center {
  text-align: center;
  background: #fff;
  border: 1px solid #e3eaf5;
  border-radius: 32px;
  padding: 32px;
  box-shadow: 0 14px 34px rgba(39, 51, 86, 0.07);
}

.install-steps {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.install-steps div {
  text-align: left;
  padding: 18px;
  border-radius: 20px;
  background: #f6f9fe;
  border: 1px solid #e5ebf5;
}

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

.faq-list .faq-item {
  box-shadow: none;
}

.site-footer {
  background: #17233f;
  color: #dbe4f2;
  padding: 44px 0 24px;
}

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

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

.site-footer a {
  display: block;
  color: #dbe4f2;
  margin: 7px 0;
}

.site-footer p {
  margin: 10px 0 0;
  color: #b7c3d7;
}

.footer-logo {
  color: #fff;
}

.footer-bottom {
  width: min(1120px, calc(100% - 32px));
  margin: 30px auto 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,0.12);
  color: #aebbd0;
  font-size: 14px;
}

@media (min-width: 720px) {
  .summary-grid,
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .risk-grid,
  .faq-grid,
  .no-log-grid,
  .protocol-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .process-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .mobile-nav {
    display: none;
  }
  .desktop-nav {
    position: static;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 2px;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }
  .desktop-nav a {
    font-size: 14px;
    padding: 8px 10px;
  }
  .hero-grid,
  .split-section,
  .vpn-connection-section,
  .global-nodes-section,
  .high-speed-section,
  .multi-device-section,
  .panel-layout,
  .page-layout,
  .article-layout {
    grid-template-columns: 1.05fr .95fr;
  }
  .article-layout,
  .page-layout {
    grid-template-columns: minmax(0, 1fr) 310px;
  }
  .risk-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .process-steps {
    grid-template-columns: repeat(3, 1fr);
  }
  .vpn-lab-hero {
    padding: 92px 0 84px;
  }
  .high-speed-section.reverse .image-shell,
  .global-nodes-section.reverse .image-shell {
    order: -1;
  }
}

@media (max-width: 430px) {
  .container,
  .narrow-container,
  .cta-section {
    width: min(100% - 24px, 1120px);
  }
  section {
    padding: 46px 0;
  }
  .vpn-lab-hero {
    padding: 54px 0 52px;
  }
  .download-btn {
    width: 100%;
  }
  .hero-actions .download-btn {
    width: 100%;
  }
  .status-pill {
    position: static;
    margin: 8px 5px 0 0;
    display: inline-flex;
  }
  .visual-panel {
    display: block;
    min-height: auto;
  }
  .product-card {
    margin-bottom: 10px;
  }
  .article-section,
  .summary-card,
  .security-card,
  .risk-card,
  .faq-item,
  .feature-card,
  .step-card,
  .note-card {
    padding: 20px;
    border-radius: 22px;
  }
}