* {
  box-sizing: border-box;
}

:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-hover: #1768E8;
  --text: #202637;
  --muted: #647086;
  --soft: #F5F7FB;
  --line: #E5EAF3;
  --card: #FFFFFF;
  --deep: #111827;
  --radius: 24px;
  --shadow: 0 18px 48px rgba(31, 52, 108, 0.10);
}

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: #FFFFFF;
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

p {
  margin: 0 0 14px;
  color: var(--muted);
}

h1, h2, h3 {
  margin: 0 0 16px;
  line-height: 1.25;
  color: var(--text);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(229,234,243,.8);
}

.nav-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: #172033;
}

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

.brand-text {
  font-size: 20px;
  letter-spacing: .02em;
}

.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.nav-toggle-label span {
  width: 22px;
  height: 2px;
  background: var(--deep);
  border-radius: 2px;
}

.site-nav {
  position: absolute;
  top: 70px;
  left: 16px;
  right: 16px;
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

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

.site-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #4E5A70;
  font-weight: 600;
  font-size: 15px;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--blue);
  background: #EEF5FF;
}

.content-container,
.section-container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 24px;
  border-radius: 999px;
  background: var(--blue);
  color: #FFFFFF;
  font-weight: 800;
  box-shadow: 0 12px 26px rgba(41,128,254,.26);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
  background: var(--blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(41,128,254,.30);
}

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

.kicker,
.category-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #EEF5FF;
  color: var(--blue);
  font-weight: 800;
  font-size: 13px;
  margin-bottom: 14px;
}

.vpn-dashboard-hero {
  background: var(--gradient);
  color: #fff;
  padding: 64px 0 54px;
  position: relative;
  overflow: hidden;
}

.vpn-dashboard-hero::after {
  content: "";
  position: absolute;
  width: 460px;
  height: 460px;
  right: -160px;
  top: -120px;
  background: rgba(255,255,255,.16);
  border-radius: 50%;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 34px;
  align-items: center;
}

.hero-copy h1 {
  color: #fff;
  font-size: clamp(34px, 8vw, 62px);
  max-width: 780px;
}

.hero-copy p {
  color: rgba(255,255,255,.86);
  font-size: 17px;
  max-width: 640px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 26px;
}

.hero-tags span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.22);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
}

.hero-visual {
  position: relative;
}

.device-card {
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 30px;
  padding: 18px;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 50px rgba(16, 24, 60, .25);
}

.device-card img {
  width: 100%;
  border-radius: 24px;
  background: rgba(255,255,255,.1);
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 10px;
  margin-top: 14px;
}

.status-card {
  background: #fff;
  color: #243047;
  border-radius: 18px;
  padding: 12px;
  box-shadow: 0 10px 28px rgba(20,30,68,.12);
}

.status-card strong {
  display: block;
  font-size: 14px;
}

.status-card span {
  color: var(--muted);
  font-size: 12px;
}

.service-index,
.section-block {
  padding: 58px 0;
}

.section-head {
  margin-bottom: 26px;
}

.section-head h2 {
  font-size: clamp(26px, 5vw, 40px);
}

.section-head p {
  max-width: 760px;
}

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

.service-card,
.info-card,
.risk-card,
.faq-item,
.page-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 14px 36px rgba(31, 52, 108, 0.06);
}

.service-card {
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 22px;
  right: 22px;
  height: 4px;
  border-radius: 0 0 8px 8px;
  background: var(--blue);
}

.service-card h3,
.info-card h3,
.risk-card h3,
.page-card h3 {
  font-size: 20px;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.pill-list span {
  background: #F1F5FC;
  color: #506079;
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.feature-section {
  padding: 44px 0;
}

.feature-card {
  display: grid;
  gap: 24px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: #fff;
  padding: 22px;
  box-shadow: var(--shadow);
}

.feature-card.alt {
  background: #F6F9FF;
}

.feature-copy h2 {
  font-size: clamp(24px, 5vw, 38px);
}

.feature-copy ul,
.simple-list {
  padding: 0;
  margin: 18px 0;
  list-style: none;
}

.feature-copy li,
.simple-list li {
  position: relative;
  padding-left: 24px;
  margin: 8px 0;
  color: #48556A;
}

.feature-copy li::before,
.simple-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--blue);
  border-radius: 50%;
  position: absolute;
  left: 0;
  top: .75em;
}

.feature-image {
  border-radius: 28px;
  overflow: hidden;
  background: #EEF5FF;
}

.feature-image img {
  width: 100%;
}

.privacy-protection-section,
.no-log-policy-section,
.encryption-protocol-section {
  background: var(--soft);
}

.safety-panel {
  display: grid;
  gap: 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.safety-panel .panel-main {
  border-left: 4px solid var(--blue);
  padding-left: 16px;
}

.panel-grid {
  display: grid;
  gap: 14px;
}

.panel-item {
  padding: 18px;
  background: #F8FAFE;
  border: 1px solid var(--line);
  border-radius: 20px;
}

.process-steps {
  display: grid;
  gap: 14px;
  counter-reset: step;
}

.step-card {
  counter-increment: step;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 20px;
  position: relative;
  box-shadow: 0 12px 30px rgba(31, 52, 108, 0.05);
}

.step-number {
  width: 38px;
  height: 38px;
  border-radius: 14px;
  background: var(--gradient);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  margin-bottom: 12px;
}

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

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

.risk-card strong {
  color: #263248;
}

.cta-section {
  padding: 54px 0;
}

.cta-panel {
  text-align: center;
  color: #fff;
  background: var(--gradient);
  border-radius: 32px;
  padding: 38px 22px;
  box-shadow: var(--shadow);
}

.cta-panel h2 {
  color: #fff;
  font-size: clamp(26px, 5vw, 40px);
}

.cta-panel p {
  color: rgba(255,255,255,.86);
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.page-hero {
  background: linear-gradient(180deg, #F6F9FF 0%, #FFFFFF 100%);
  padding: 54px 0 28px;
}

.page-hero h1 {
  font-size: clamp(32px, 6vw, 52px);
  max-width: 860px;
}

.page-hero p {
  max-width: 820px;
  font-size: 17px;
}

.page-layout {
  padding: 34px 0 58px;
  display: grid;
  gap: 22px;
}

.page-main {
  display: grid;
  gap: 20px;
}

.page-sidebar {
  display: grid;
  gap: 16px;
  align-content: start;
}

.note-box,
.check-box {
  border-radius: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  background: #F8FAFE;
}

.note-box {
  border-left: 4px solid var(--blue);
}

.check-list {
  padding: 0;
  list-style: none;
  margin: 0;
}

.check-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  color: #4B5870;
}

.check-list li:last-child {
  border-bottom: 0;
}

.download-strip {
  margin-top: 8px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 26px;
  box-shadow: var(--shadow);
}

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

.faq-item h2,
.faq-item h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.site-footer {
  background: #F6F8FC;
  border-top: 1px solid var(--line);
  padding-top: 42px;
}

.footer-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  gap: 28px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.footer-logo img {
  width: 36px;
  height: 36px;
  border-radius: 12px;
}

.footer-brand p {
  max-width: 460px;
}

.footer-links {
  display: grid;
  gap: 20px;
}

.footer-links h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.footer-links a {
  display: block;
  color: var(--muted);
  margin: 6px 0;
}

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

.footer-bottom {
  width: min(1180px, calc(100% - 32px));
  margin: 28px auto 0;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (min-width: 700px) {
  .service-grid,
  .category-grid,
  .panel-grid,
  .risk-grid,
  .faq-grid,
  .process-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

  .hero-grid {
    grid-template-columns: 1.05fr .95fr;
  }

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

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

  .feature-card {
    grid-template-columns: 1fr 1fr;
    padding: 30px;
  }

  .feature-card.reverse .feature-image {
    order: -1;
  }

  .safety-panel {
    grid-template-columns: .9fr 1.1fr;
  }

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

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

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

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 330px;
    align-items: start;
  }

  .footer-inner {
    grid-template-columns: .9fr 1.4fr;
  }
}

@media (min-width: 1180px) {
  .site-nav a {
    font-size: 15px;
    padding: 9px 12px;
  }
}

@media (max-width: 480px) {
  .download-btn {
    width: 100%;
  }

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

  .feature-card,
  .safety-panel,
  .service-card,
  .info-card,
  .risk-card,
  .faq-item,
  .page-card {
    border-radius: 20px;
  }

  .vpn-dashboard-hero {
    padding-top: 46px;
  }

  .service-index,
  .section-block {
    padding: 42px 0;
  }
}