* {
  box-sizing: border-box;
}

:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-hover: #1768E8;
  --text: #1d2433;
  --muted: #667085;
  --light: #f5f7fb;
  --soft-blue: #f0f5ff;
  --border: #e5e9f2;
  --card: #ffffff;
  --shadow: 0 16px 40px rgba(28, 39, 76, 0.08);
  --radius: 24px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

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

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

p {
  margin: 0 0 14px;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.25;
  color: #172033;
}

h1 {
  font-size: clamp(34px, 8vw, 64px);
  letter-spacing: -1.8px;
}

h2 {
  font-size: clamp(26px, 5vw, 42px);
  letter-spacing: -1px;
}

h3 {
  font-size: 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(229, 233, 242, 0.9);
  backdrop-filter: blur(18px);
}

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

.header-inner {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand,
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-img,
.footer-logo {
  width: 42px;
  height: 42px;
  object-fit: cover;
  border-radius: 12px;
}

.brand-text {
  font-weight: 800;
  color: #182135;
  font-size: 18px;
}

.site-nav {
  display: none;
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  padding: 12px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.site-nav a {
  display: block;
  padding: 11px 12px;
  color: #344054;
  border-radius: 12px;
  font-weight: 600;
  font-size: 14px;
}

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

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

.nav-toggle-label {
  width: 42px;
  height: 42px;
  display: grid;
  place-content: center;
  gap: 5px;
  border: 1px solid var(--border);
  border-radius: 14px;
  cursor: pointer;
  background: #fff;
}

.nav-toggle-label span {
  width: 18px;
  height: 2px;
  background: #202b3c;
  display: block;
  border-radius: 2px;
}

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

.section {
  padding: 58px 0;
}

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

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

.section-kicker,
.category-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 8px;
  color: var(--blue);
  background: var(--soft-blue);
  border: 1px solid rgba(41, 128, 254, 0.16);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 800;
  margin-bottom: 14px;
}

.section-heading p,
.page-summary {
  color: var(--muted);
  font-size: 17px;
}

.gradient-bg,
.vpn-dashboard-hero,
.cta-section {
  background: var(--gradient);
}

.vpn-dashboard-hero {
  color: #fff;
  overflow: hidden;
  position: relative;
}

.vpn-dashboard-hero::before {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.13);
  right: -150px;
  top: -170px;
}

.vpn-dashboard-hero .container {
  position: relative;
  padding: 54px 0 46px;
  display: grid;
  gap: 34px;
  align-items: center;
}

.hero-copy h1,
.hero-copy p,
.hero-copy h2 {
  color: #fff;
}

.hero-copy p {
  max-width: 640px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 18px;
}

.security-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 26px;
}

.security-tags span {
  padding: 8px 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;
  font-weight: 700;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 26px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 24px rgba(41, 128, 254, 0.25);
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
  background: var(--blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(23, 104, 232, 0.28);
}

.hero-dashboard {
  border-radius: 30px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 28px 70px rgba(18, 23, 44, 0.18);
  backdrop-filter: blur(12px);
}

.hero-visual {
  position: relative;
  border-radius: 28px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.92);
  padding: 18px;
}

.hero-visual img {
  margin: 0 auto;
  border-radius: 22px;
}

.status-card {
  background: #fff;
  color: #172033;
  border-radius: 18px;
  padding: 14px;
  border: 1px solid rgba(229, 233, 242, 0.88);
  box-shadow: 0 12px 30px rgba(29, 36, 51, 0.08);
}

.status-card strong {
  display: block;
  color: #172033;
  font-size: 15px;
}

.status-card span {
  color: var(--muted);
  font-size: 13px;
}

.status-grid {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.service-index {
  display: grid;
  gap: 16px;
}

.service-card,
.info-card,
.risk-card,
.faq-item,
.page-card,
.tip-box,
.step-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 32px rgba(28, 39, 76, 0.05);
}

.service-card {
  padding: 20px;
  min-height: 190px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.service-tag {
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.service-card p,
.info-card p,
.risk-card p,
.faq-item p,
.page-card p,
.tip-box p,
.step-card p,
.section-text {
  color: var(--muted);
}

.text-link {
  color: var(--blue);
  font-weight: 800;
}

.feature-section {
  padding: 62px 0;
}

.feature-panel {
  display: grid;
  gap: 28px;
  align-items: center;
  border-radius: 30px;
  padding: 22px;
  border: 1px solid var(--border);
  background: #fff;
  box-shadow: var(--shadow);
}

.feature-panel.alt {
  background: linear-gradient(180deg, #f7faff 0%, #ffffff 100%);
}

.feature-panel img {
  border-radius: 24px;
  background: #f6f8fc;
}

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

.feature-list li {
  position: relative;
  padding-left: 24px;
  color: #475467;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--blue);
}

.safety-panel {
  border-radius: 28px;
  padding: 22px;
  background: linear-gradient(135deg, #f0f5ff 0%, #ffffff 60%);
  border: 1px solid rgba(41, 128, 254, 0.14);
}

.safety-grid,
.category-grid,
.risk-grid,
.faq-grid,
.related-grid,
.check-grid {
  display: grid;
  gap: 16px;
}

.info-card,
.risk-card,
.faq-item,
.page-card,
.tip-box,
.step-card {
  padding: 20px;
}

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

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

.step-card {
  position: relative;
  padding-left: 72px;
}

.step-card::before {
  counter-increment: steps;
  content: counter(steps);
  position: absolute;
  left: 20px;
  top: 22px;
  width: 36px;
  height: 36px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--blue);
  color: #fff;
  font-weight: 900;
}

.cta-section {
  margin: 58px auto;
  width: min(1160px, calc(100% - 32px));
  border-radius: 34px;
  padding: 42px 22px;
  text-align: center;
  color: #fff;
  overflow: hidden;
  position: relative;
}

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

.cta-section p {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  color: rgba(255, 255, 255, 0.88);
}

.page-hero {
  background: linear-gradient(180deg, #f3f7ff 0%, #ffffff 100%);
  padding: 56px 0 34px;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  color: #172033;
  margin-bottom: 16px;
}

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

.article {
  display: grid;
  gap: 18px;
}

.page-card h2,
.tip-box h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

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

.sidebar .tip-box {
  background: #fbfcff;
}

.download-center {
  display: grid;
  gap: 22px;
}

.download-panel {
  border-radius: 30px;
  padding: 24px;
  background: linear-gradient(180deg, #f5f9ff 0%, #ffffff 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  text-align: center;
}

.steps-list {
  margin: 0;
  padding-left: 20px;
  color: #475467;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 800;
  color: #172033;
}

.faq-item details[open] summary {
  margin-bottom: 10px;
}

.site-footer {
  margin-top: 40px;
  padding: 38px 0;
  background: #f7f9fc;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: grid;
  gap: 22px;
}

.footer-brand p,
.footer-note {
  color: var(--muted);
  margin: 4px 0 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
}

.footer-links a {
  color: #344054;
  font-weight: 700;
}

.footer-links a:hover {
  color: var(--blue);
}

@media (min-width: 640px) {
  .service-index,
  .category-grid,
  .risk-grid,
  .faq-grid,
  .related-grid,
  .check-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .status-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  body {
    font-size: 17px;
  }

  .nav-toggle-label {
    display: none;
  }

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

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

  .vpn-dashboard-hero .container {
    min-height: 620px;
    grid-template-columns: 1.02fr 0.98fr;
    gap: 46px;
    padding: 70px 0;
  }

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

  .service-card:nth-child(1),
  .service-card:nth-child(2) {
    grid-column: span 2;
  }

  .feature-panel {
    grid-template-columns: 1fr 1fr;
    padding: 34px;
  }

  .feature-panel.reverse .feature-media {
    order: 2;
  }

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

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

  .faq-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .download-center {
    grid-template-columns: 1fr 1fr;
  }

  .footer-inner {
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
  }

  .footer-note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1120px) {
  .site-nav a {
    padding: 9px 12px;
  }

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