* {
  box-sizing: border-box;
}

:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #253044;
  --muted: #657084;
  --light: #f5f7fb;
  --line: #e6ebf3;
  --card: #ffffff;
  --deep: #1d2b46;
  --radius-lg: 30px;
  --radius-md: 22px;
  --shadow: 0 16px 45px rgba(40, 60, 120, 0.12);
}

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: #f7f9fd;
  line-height: 1.75;
  overflow-x: hidden;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(230, 235, 243, 0.86);
}

.header-inner {
  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: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--deep);
  white-space: nowrap;
}

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

.nav-toggle {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  color: var(--deep);
  font-size: 22px;
  width: 44px;
  height: 44px;
}

.main-nav {
  display: none;
  position: absolute;
  left: 16px;
  right: 16px;
  top: 70px;
  padding: 14px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.main-nav.is-open {
  display: grid;
  gap: 6px;
}

.main-nav a {
  padding: 10px 12px;
  color: #4d5a70;
  border-radius: 12px;
  font-size: 14px;
}

.main-nav a:hover,
.main-nav a.active {
  background: #eef5ff;
  color: var(--blue);
}

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

.section {
  padding: 68px 0;
}

.section.compact {
  padding: 46px 0;
}

.section-title {
  margin: 0 0 14px;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1.2;
  color: var(--deep);
}

.section-lead {
  margin: 0 0 28px;
  color: var(--muted);
  max-width: 760px;
}

.kicker,
.category-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  margin-bottom: 16px;
  border-radius: 999px;
  background: #eef5ff;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.gradient-bg {
  background: var(--gradient);
  color: #fff;
}

.connection-workspace-hero {
  width: min(1240px, calc(100% - 24px));
  margin: 18px auto 0;
  border-radius: 34px;
  padding: 38px 18px;
  background: var(--gradient);
  color: #fff;
  overflow: hidden;
  position: relative;
}

.connection-workspace-hero::before {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -160px;
  top: -160px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
}

.hero-grid {
  position: relative;
  display: grid;
  gap: 28px;
  align-items: center;
}

.hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(34px, 9vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.hero-copy p {
  margin: 0 0 24px;
  max-width: 620px;
  color: rgba(255, 255, 255, 0.88);
}

.hero-tags,
.status-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.hero-tags span,
.status-tags span {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  font-size: 13px;
  border: 1px solid rgba(255, 255, 255, 0.22);
}

.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;
  box-shadow: 0 12px 24px rgba(41, 128, 254, 0.26);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
  background: var(--blue-dark);
  transform: translateY(-2px);
  box-shadow: 0 16px 28px rgba(23, 104, 232, 0.28);
}

.hero-visual {
  position: relative;
}

.hero-device {
  padding: 20px;
  border-radius: 32px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.22);
}

.hero-device img {
  width: 100%;
  border-radius: 24px;
  box-shadow: 0 25px 80px rgba(20, 28, 68, 0.22);
}

.status-panel {
  margin-top: 16px;
  padding: 18px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--deep);
  box-shadow: var(--shadow);
}

.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
}

.status-row:last-child {
  border-bottom: 0;
}

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

.status-value {
  color: var(--blue);
  font-weight: 800;
}

.quick-task-entries,
.risk-grid,
.faq-grid,
.card-grid,
.scenario-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.quick-task-entries {
  margin-top: -34px;
  position: relative;
  z-index: 3;
}

.task-card,
.capability-card,
.info-card,
.risk-card,
.faq-item,
.step-card,
.panel-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: 0 10px 30px rgba(38, 57, 95, 0.06);
}

.task-card small,
.capability-card small,
.info-card small {
  color: var(--blue);
  font-weight: 800;
  display: inline-block;
  margin-bottom: 8px;
}

.task-card h3,
.capability-card h3,
.info-card h3,
.risk-card h3,
.faq-item h3,
.step-card h3,
.panel-card h3 {
  margin: 0 0 8px;
  color: var(--deep);
  line-height: 1.35;
}

.task-card p,
.capability-card p,
.info-card p,
.risk-card p,
.faq-item p,
.step-card p,
.panel-card p {
  margin: 0;
  color: var(--muted);
}

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

.connection-capability-overview {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.capability-card.featured {
  background: linear-gradient(180deg, #ffffff 0%, #f3f7ff 100%);
}

.feature-section,
.quick-connect-section,
.encrypted-tunnel-section,
.route-optimization-section,
.device-protection-section,
.data-boundary-section,
.usage-scenarios-section,
.connection-checkup-section,
.safety-panel {
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--line);
  padding: 24px;
  box-shadow: var(--shadow);
}

.feature-grid,
.split-grid,
.security-grid,
.route-grid,
.device-grid,
.boundary-grid,
.checkup-grid,
.subpage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}

.feature-image {
  border-radius: 26px;
  padding: 14px;
  background: #f3f7ff;
  border: 1px solid var(--line);
}

.feature-image img {
  border-radius: 20px;
}

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

.bullet-list li,
.check-list li,
.simple-list li {
  position: relative;
  padding-left: 26px;
  color: var(--muted);
}

.bullet-list li::before,
.check-list li::before,
.simple-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
}

.soft-bg {
  background: #eef4ff;
}

.process-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  counter-reset: step;
}

.step-card {
  position: relative;
}

.step-number {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  margin-bottom: 12px;
}

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

.cta-section {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto 64px;
  border-radius: 34px;
  padding: 42px 20px;
  text-align: center;
  background: var(--gradient);
  color: #fff;
  overflow: hidden;
  position: relative;
}

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

.cta-section p {
  max-width: 690px;
  margin: 0 auto 22px;
  color: rgba(255, 255, 255, .88);
}

.subpage-hero {
  padding: 58px 0 30px;
  background: linear-gradient(180deg, #f3f7ff 0%, #f7f9fd 100%);
}

.subpage-hero h1 {
  margin: 0 0 14px;
  font-size: clamp(32px, 8vw, 56px);
  line-height: 1.12;
  color: var(--deep);
  letter-spacing: -0.03em;
}

.subpage-hero p {
  margin: 0;
  max-width: 820px;
  color: var(--muted);
}

.subpage-content {
  padding: 36px 0 72px;
}

.article-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}

.article-panel h2 {
  margin-top: 0;
  color: var(--deep);
}

.article-panel p {
  color: var(--muted);
}

.side-panel {
  align-self: start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: 0 10px 30px rgba(38, 57, 95, 0.06);
}

.side-panel h3 {
  margin-top: 0;
  color: var(--deep);
}

.download-note {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.download-page-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.download-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

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

.site-footer {
  background: #162239;
  color: rgba(255, 255, 255, .78);
  padding: 44px 0;
}

.footer-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  gap: 22px;
}

.footer-logo {
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 8px;
}

.footer-inner p {
  margin: 0;
  max-width: 620px;
}

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

.footer-links a {
  color: rgba(255, 255, 255, .86);
  padding: 8px 0;
}

@media (min-width: 640px) {
  .quick-task-entries,
  .risk-grid,
  .faq-grid,
  .card-grid,
  .scenario-grid,
  .download-page-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .connection-capability-overview {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .connection-workspace-hero {
    padding: 54px 34px;
  }
}

@media (min-width: 920px) {
  .nav-toggle {
    display: none;
  }

  .main-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
  }

  .main-nav a {
    font-size: 13px;
    padding: 9px 10px;
  }

  .hero-grid,
  .feature-grid,
  .split-grid,
  .route-grid,
  .device-grid,
  .checkup-grid,
  .subpage-grid,
  .download-main {
    grid-template-columns: minmax(0, 1.03fr) minmax(320px, .97fr);
  }

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

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

  .quick-task-entries {
    grid-template-columns: repeat(4, 1fr);
  }

  .connection-capability-overview {
    grid-template-columns: repeat(6, 1fr);
  }

  .capability-card {
    grid-column: span 2;
  }

  .capability-card.featured {
    grid-column: span 3;
    min-height: 230px;
  }

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

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

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

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

  .footer-inner {
    grid-template-columns: 1fr auto;
    align-items: start;
  }

  .site-header .header-inner {
    min-height: 78px;
  }
}

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

  .article-panel {
    padding: 34px;
  }

  .feature-section,
  .quick-connect-section,
  .encrypted-tunnel-section,
  .route-optimization-section,
  .device-protection-section,
  .data-boundary-section,
  .usage-scenarios-section,
  .connection-checkup-section,
  .safety-panel {
    padding: 34px;
  }
}