* {
  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: #f5f7fb;
  --line: #e5e7eb;
  --deep: #111827;
  --radius: 26px;
  --shadow: 0 20px 60px rgba(31, 41, 55, .10);
}

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: #fff;
  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;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(229, 231, 235, .85);
}

.header-inner {
  width: min(1160px, calc(100% - 28px));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--deep);
  letter-spacing: .02em;
}

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

.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: inline-flex;
  min-width: 58px;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 8px 13px;
  color: var(--blue);
  border: 1px solid rgba(41, 128, 254, .24);
  border-radius: 999px;
  font-weight: 700;
  background: #fff;
}

.site-nav {
  display: none;
  position: absolute;
  top: 68px;
  left: 16px;
  right: 16px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.nav-toggle:checked ~ .site-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.site-nav a {
  color: #344054;
  font-size: 14px;
  padding: 10px 12px;
  border-radius: 14px;
}

.site-nav a:hover {
  background: #eef4ff;
  color: var(--blue);
}

.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 14px 30px rgba(41, 128, 254, .24);
  transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}

.download-btn:hover {
  background: var(--blue-dark);
  transform: translateY(-1px);
  box-shadow: 0 18px 34px rgba(23, 104, 232, .28);
}

.section {
  padding: 72px 0;
}

.section-soft {
  background: linear-gradient(180deg, #f7f9ff 0%, #ffffff 100%);
}

.section-title {
  max-width: 760px;
  margin-bottom: 28px;
}

.eyebrow,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  padding: 6px 12px;
  background: #eef4ff;
  border: 1px solid rgba(41, 128, 254, .16);
  border-radius: 999px;
}

h1,
h2,
h3 {
  color: var(--deep);
  line-height: 1.18;
  margin: 0;
}

h1 {
  font-size: clamp(34px, 8vw, 64px);
  letter-spacing: -.04em;
}

h2 {
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -.03em;
}

h3 {
  font-size: 20px;
  letter-spacing: -.01em;
}

p {
  color: var(--muted);
  margin: 12px 0 0;
}

.vpn-lab-hero {
  position: relative;
  color: #fff;
  background: var(--gradient);
  overflow: hidden;
}

.vpn-lab-hero::after {
  content: "";
  position: absolute;
  inset: auto -12% -24% 20%;
  height: 280px;
  background: rgba(255, 255, 255, .18);
  filter: blur(70px);
  border-radius: 999px;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 72px 0 54px;
  display: grid;
  gap: 34px;
}

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

.hero-content p {
  font-size: 17px;
  max-width: 680px;
  opacity: .9;
}

.hero-tags,
.status-row,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.hero-tags span,
.status-row span,
.tag-row span {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
  background: rgba(255, 255, 255, .18);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .28);
}

.hero-actions {
  margin-top: 26px;
}

.hero-visual {
  position: relative;
  min-height: 320px;
  padding: 18px;
}

.hero-device {
  position: relative;
  z-index: 1;
  width: min(420px, 86vw);
  margin: 0 auto;
  padding: 18px;
  border-radius: 34px;
  background: rgba(255, 255, 255, .18);
  border: 1px solid rgba(255, 255, 255, .32);
  backdrop-filter: blur(14px);
}

.hero-device img {
  width: 100%;
  border-radius: 26px;
}

.floating-status {
  position: absolute;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 13px;
  background: rgba(255, 255, 255, .92);
  color: #1f2937;
  border-radius: 999px;
  box-shadow: 0 18px 40px rgba(17, 24, 39, .14);
  font-size: 13px;
  font-weight: 800;
}

.floating-status::before {
  content: "";
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
}

.status-one {
  top: 24px;
  left: 4px;
}

.status-two {
  top: 112px;
  right: 0;
}

.status-three {
  bottom: 88px;
  left: 10px;
}

.status-four {
  bottom: 20px;
  right: 24px;
}

.privacy-summary {
  margin-top: -28px;
  position: relative;
  z-index: 3;
}

.summary-grid {
  display: grid;
  gap: 16px;
}

.summary-card,
.security-card,
.panel-card,
.risk-card,
.faq-item,
.step-card,
.info-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 36px rgba(31, 41, 55, .06);
}

.summary-card {
  padding: 22px;
}

.summary-card .label,
.panel-label {
  display: inline-flex;
  padding: 5px 10px;
  background: #eef4ff;
  color: var(--blue);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 14px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  color: var(--blue);
  font-weight: 800;
}

.text-link::after {
  content: "→";
}

.split-section {
  display: grid;
  gap: 28px;
  align-items: center;
}

.media-panel {
  padding: 18px;
  background: #f8fbff;
  border: 1px solid var(--line);
  border-radius: 34px;
}

.media-panel img {
  border-radius: 24px;
  margin: 0 auto;
}

.feature-list {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  position: relative;
  padding: 14px 16px 14px 42px;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 18px;
  color: #475467;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 21px;
  width: 9px;
  height: 9px;
  background: var(--blue);
  border-radius: 50%;
}

.privacy-protection-section .privacy-panel {
  display: grid;
  gap: 16px;
  padding: 18px;
  border-radius: 34px;
  background: linear-gradient(180deg, #ffffff 0%, #f7f9ff 100%);
  border: 1px solid var(--line);
}

.boundary-grid,
.policy-grid,
.protocol-grid,
.card-grid {
  display: grid;
  gap: 16px;
}

.panel-card,
.info-card {
  padding: 22px;
}

.no-log-policy-section {
  background: #f7f9ff;
}

.global-nodes-section .nodes-board {
  padding: 22px;
  border-radius: 34px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.node-lines {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.node-line {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  border-radius: 16px;
  background: #f8fafc;
  border: 1px solid var(--line);
  color: #475467;
}

.high-speed-section {
  background: linear-gradient(180deg, #f7f9ff, #eef4ff);
}

.speed-meter {
  padding: 22px;
  border-radius: 30px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.meter-bar {
  height: 12px;
  border-radius: 999px;
  background: #eaf0ff;
  overflow: hidden;
  margin: 18px 0;
}

.meter-bar span {
  display: block;
  width: 72%;
  height: 100%;
  border-radius: 999px;
  background: var(--gradient);
}

.device-strip {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.device-card {
  padding: 18px;
  border-radius: 24px;
  background: #fff;
  border: 1px solid var(--line);
}

.protocol-board {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 34px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.code-lines {
  display: grid;
  gap: 10px;
  margin-top: 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
}

.code-lines span {
  display: block;
  padding: 12px 14px;
  border-radius: 14px;
  background: #f8fafc;
  color: #344054;
  border: 1px solid var(--line);
}

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

.step-card {
  padding: 22px;
  position: relative;
}

.step-number {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  color: #fff;
  background: var(--blue);
  font-weight: 900;
  margin-bottom: 14px;
}

.risk-grid {
  display: grid;
  gap: 16px;
}

.risk-card {
  padding: 20px;
  border-left: 4px solid var(--blue);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: 20px;
}

.faq-item h3 {
  font-size: 18px;
}

.cta-section {
  padding: 72px 0;
  background: var(--gradient);
  color: #fff;
  text-align: center;
}

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

.cta-section p {
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  opacity: .9;
}

.cta-section .download-btn {
  margin-top: 24px;
  background: var(--blue);
}

.page-hero {
  background: linear-gradient(180deg, #f7f9ff 0%, #ffffff 100%);
  padding: 58px 0 34px;
}

.page-hero-inner {
  width: min(940px, calc(100% - 32px));
  margin: 0 auto;
}

.page-hero h1 {
  margin-top: 16px;
  font-size: clamp(32px, 6vw, 54px);
}

.page-layout {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 44px 0 78px;
  display: grid;
  gap: 24px;
}

.article-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: #fff;
  box-shadow: 0 12px 36px rgba(31, 41, 55, .05);
}

.article-card h2 {
  font-size: 26px;
  margin-top: 4px;
}

.article-card h3 {
  margin-top: 22px;
}

.article-card ul,
.article-card ol {
  margin: 18px 0 0;
  padding-left: 20px;
  color: #475467;
}

.article-card li {
  margin: 9px 0;
}

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

.side-panel .info-card {
  background: #f8fbff;
}

.page-download {
  margin-top: 24px;
}

.download-steps {
  counter-reset: steps;
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.download-steps div {
  counter-increment: steps;
  padding: 18px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: #f8fafc;
}

.download-steps div::before {
  content: counter(steps);
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 10px;
  color: #fff;
  background: var(--blue);
  border-radius: 10px;
  font-weight: 900;
}

.site-footer {
  background: #111827;
  color: #d1d5db;
  padding: 54px 0 24px;
}

.site-footer p,
.site-footer a {
  color: #aeb6c3;
}

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

.footer-brand {
  font-size: 24px;
  font-weight: 900;
  color: #fff;
}

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

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

.footer-bottom {
  width: min(1120px, calc(100% - 32px));
  margin: 32px auto 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, .12);
  color: #98a2b3;
  font-size: 14px;
}

@media (min-width: 720px) {
  .summary-grid,
  .policy-grid,
  .protocol-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .nav-toggle-label {
    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 {
    white-space: nowrap;
  }

  .hero-inner {
    min-height: 620px;
    grid-template-columns: 1.02fr .98fr;
    align-items: center;
    padding: 88px 0 70px;
  }

  .split-section {
    grid-template-columns: 1fr 1fr;
    gap: 52px;
  }

  .split-section.reverse .media-panel {
    order: 2;
  }

  .privacy-protection-section .split-section {
    grid-template-columns: .88fr 1.12fr;
  }

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

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

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

@media (max-width: 520px) {
  .section {
    padding: 56px 0;
  }

  .hero-inner {
    padding-top: 50px;
  }

  .download-btn {
    width: 100%;
  }

  .hero-actions .download-btn,
  .cta-section .download-btn,
  .page-download .download-btn {
    width: auto;
    min-width: 180px;
  }

  .floating-status {
    position: static;
    margin: 8px 6px 0 0;
  }

  .hero-visual {
    min-height: auto;
  }

  .status-one,
  .status-two,
  .status-three,
  .status-four {
    top: auto;
    left: auto;
    right: auto;
    bottom: auto;
  }
}