:root {
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #263044;
  --muted: #657085;
  --light: #F5F7FB;
  --line: #E6EAF2;
  --white: #FFFFFF;
  --shadow: 0 18px 45px rgba(47, 70, 120, .10);
  --radius: 28px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: #F7F9FD;
  line-height: 1.7;
  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,.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(230,234,242,.88);
}
.nav-shell { 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: #19243A; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.site-nav { display: none; flex-direction: column; gap: 8px; position: absolute; left: 16px; right: 16px; top: 70px; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.site-nav.open { display: flex; }
.site-nav a { padding: 10px 12px; color: #526076; border-radius: 14px; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { color: var(--blue); background: #EEF5FF; }
.nav-toggle { width: 42px; height: 42px; border: 1px solid var(--line); background: #fff; border-radius: 14px; display: grid; place-content: center; gap: 5px; }
.nav-toggle span { display: block; width: 18px; height: 2px; background: #25314B; border-radius: 2px; }
.section { padding: 58px 0; }
.section-title { margin: 0 0 12px; font-size: clamp(26px, 5vw, 42px); line-height: 1.2; color: #17233B; }
.section-lead { margin: 0 0 28px; color: var(--muted); max-width: 760px; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 8px; padding: 7px 12px; border-radius: 999px; background: #EEF5FF; color: var(--blue); font-weight: 700; font-size: 13px; }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 14px 28px rgba(41,128,254,.24);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 18px 34px rgba(23,104,232,.26); }
.connection-workspace-hero {
  padding: 38px 0;
  background: var(--gradient);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.connection-workspace-hero::after { content: ""; position: absolute; inset: 10% -15% auto auto; width: 320px; height: 320px; border-radius: 50%; background: rgba(255,255,255,.18); filter: blur(8px); }
.hero-grid { position: relative; z-index: 1; display: grid; gap: 28px; align-items: center; }
.hero-copy h1 { margin: 16px 0 16px; font-size: clamp(34px, 8vw, 64px); line-height: 1.08; letter-spacing: -1px; }
.hero-copy p { margin: 0 0 22px; color: rgba(255,255,255,.88); font-size: 17px; max-width: 680px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.25); color: #fff; font-size: 13px; }
.hero-visual { position: relative; padding: 14px; border-radius: 34px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.22); }
.hero-visual img { border-radius: 28px; margin: 0 auto; max-height: 440px; object-fit: contain; }
.status-panel { background: #fff; color: var(--text); border-radius: 24px; padding: 18px; box-shadow: var(--shadow); border: 1px solid rgba(255,255,255,.45); }
.hero-visual .status-panel { margin-top: 14px; }
.status-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.status-row:last-child { border-bottom: 0; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: #2ED47A; box-shadow: 0 0 0 6px rgba(46,212,122,.12); display: inline-block; margin-right: 8px; }
.quick-task-entries { margin-top: -28px; position: relative; z-index: 4; }
.quick-task-grid, .risk-grid, .scenario-grid, .info-grid, .faq-grid { display: grid; gap: 16px; }
.quick-card, .task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card, .guide-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px;
  box-shadow: 0 12px 32px rgba(40,57,93,.06);
}
.quick-card span, .task-card span, .capability-card span { color: var(--blue); font-weight: 800; font-size: 13px; }
.quick-card h3, .task-card h3, .capability-card h3, .info-card h3, .risk-card h3, .faq-item h3, .step-card h3 { margin: 10px 0 8px; color: #18243A; line-height: 1.3; }
.quick-card p, .task-card p, .capability-card p, .info-card p, .risk-card p, .faq-item p, .step-card p { margin: 0; color: var(--muted); }
.inline-link { display: inline-flex; margin-top: 14px; color: var(--blue); font-weight: 800; }
.connection-capability-overview { background: #fff; }
.capability-grid { display: grid; gap: 16px; }
.capability-card.featured { background: linear-gradient(135deg, #F3F7FF 0%, #FFFFFF 58%, #F7F0FF 100%); }
.split-section { display: grid; gap: 24px; align-items: center; }
.panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.panel img { border-radius: 24px; margin: 12px auto 0; max-height: 360px; object-fit: contain; }
.feature-list { display: grid; gap: 12px; margin: 18px 0 0; padding: 0; list-style: none; }
.feature-list li { padding: 12px 14px; border-radius: 16px; background: #F5F8FF; color: #44516A; }
.feature-list li strong { color: #17233B; }
.encrypted-tunnel-section { background: #F1F5FB; }
.security-panel { display: grid; gap: 18px; align-items: center; }
.security-tags { display: grid; gap: 12px; }
.security-tags div { padding: 18px; border-radius: 20px; background: #fff; border: 1px solid var(--line); }
.route-optimization-section { background: linear-gradient(180deg, #FFFFFF 0%, #F3F6FC 100%); }
.route-board { display: grid; gap: 18px; }
.route-stat { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 18px; }
.route-line { height: 8px; border-radius: 999px; background: #E7EEF8; overflow: hidden; margin: 12px 0; }
.route-line span { display: block; height: 100%; width: 68%; background: var(--blue); border-radius: 999px; }
.device-protection-section, .usage-scenarios-section { background: #fff; }
.device-grid { display: grid; gap: 16px; }
.device-card { background: #F6F8FC; border: 1px solid var(--line); border-radius: 24px; padding: 18px; }
.device-card h3 { margin: 0 0 8px; }
.data-boundary-section { background: #F6F8FC; }
.boundary-strip { display: grid; gap: 16px; }
.checkup-board { display: grid; gap: 16px; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-left: 72px; }
.step-card::before { counter-increment: step; content: counter(step, decimal-leading-zero); position: absolute; left: 20px; top: 22px; width: 36px; height: 36px; border-radius: 14px; background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 800; }
.risk-card { border-left: 4px solid var(--blue); }
.cta-section { padding: 64px 0; background: var(--gradient); color: #fff; text-align: center; }
.cta-section .section-title, .cta-section p { color: #fff; margin-left: auto; margin-right: auto; }
.page-hero { padding: 54px 0 28px; background: linear-gradient(180deg, #F6F8FF 0%, #FFFFFF 100%); }
.page-hero h1 { margin: 14px 0 12px; font-size: clamp(30px, 7vw, 52px); line-height: 1.15; }
.page-hero p { color: var(--muted); max-width: 760px; margin: 0; }
.content-layout { display: grid; gap: 24px; align-items: start; }
.article-card { background: #fff; border: 1px solid var(--line); border-radius: 28px; padding: 24px; box-shadow: var(--shadow); }
.article-card h2 { margin-top: 0; color: #17233B; }
.article-card p { color: #4E5B72; }
.side-panel { background: #F6F9FF; border: 1px solid var(--line); border-radius: 26px; padding: 22px; }
.side-panel h3 { margin-top: 0; }
.check-list { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 10px; }
.check-list li { padding: 12px 14px; background: #fff; border: 1px solid var(--line); border-radius: 16px; color: #506078; }
.download-center { text-align: center; background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 34px; box-shadow: var(--shadow); }
.download-steps { display: grid; gap: 16px; margin-top: 24px; text-align: left; }
.faq-page-list { display: grid; gap: 16px; }
.faq-page-list .faq-item { box-shadow: none; }
.site-footer { background: #182238; color: rgba(255,255,255,.78); padding: 42px 0 20px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: #fff; font-size: 18px; }
.footer-brand img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.site-footer h3 { color: #fff; margin: 0 0 12px; font-size: 16px; }
.site-footer a { display: block; color: rgba(255,255,255,.72); margin: 7px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 28px; padding-top: 18px; font-size: 13px; }
@media (min-width: 680px) {
  .quick-task-grid, .info-grid, .device-grid, .risk-grid, .faq-grid, .download-steps { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .capability-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .scenario-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .boundary-strip { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .process-steps { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (min-width: 940px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; flex-direction: row; align-items: center; background: transparent; border: 0; box-shadow: none; padding: 0; gap: 3px; }
  .site-nav a { font-size: 14px; }
  .connection-workspace-hero { padding: 72px 0 86px; }
  .hero-grid { grid-template-columns: minmax(0,1.05fr) minmax(360px,.95fr); gap: 48px; }
  .hero-visual .status-panel { position: absolute; right: -8px; bottom: 18px; width: 270px; margin: 0; }
  .quick-task-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .capability-grid { grid-template-columns: repeat(4, minmax(0,1fr)); grid-auto-flow: dense; }
  .capability-card.featured { grid-column: span 2; min-height: 210px; }
  .split-section, .security-panel, .route-board, .content-layout { grid-template-columns: minmax(0,1fr) 360px; }
  .route-board { grid-template-columns: 1.1fr .9fr; }
  .risk-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .footer-grid { grid-template-columns: 1.4fr repeat(3, .75fr); }
  .article-card { padding: 34px; }
}
@media (max-width: 420px) {
  .container { width: min(100% - 24px, 1120px); }
  .download-btn { width: 100%; }
  .hero-copy h1 { font-size: 34px; }
  .quick-card, .task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card, .article-card { border-radius: 20px; }
}