:root {
  --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue: #2980FE;
  --blue-dark: #1768E8;
  --text: #1e2433;
  --muted: #667085;
  --soft: #f5f7fb;
  --soft-blue: #eef5ff;
  --border: #e6eaf2;
  --card: #ffffff;
  --shadow: 0 18px 45px rgba(40, 60, 120, .10);
  --radius: 28px;
}
* { box-sizing: border-box; }
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: #fff;
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(230,234,242,.9);
}
.header-inner, .footer-inner, .container, .wide-container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}
.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-trigger { width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 14px; display: grid; place-items: center; gap: 4px; padding: 10px; }
.nav-trigger span { display: block; width: 18px; height: 2px; background: #26334d; border-radius: 8px; }
.site-nav { position: absolute; top: 68px; left: 16px; right: 16px; display: none; padding: 14px; background: #fff; border: 1px solid var(--border); border-radius: 22px; box-shadow: var(--shadow); }
.nav-toggle:checked ~ .site-nav { display: grid; gap: 6px; }
.site-nav a { padding: 10px 12px; border-radius: 12px; color: #4b5565; font-weight: 650; font-size: 14px; }
.site-nav a.active, .site-nav a:hover { color: var(--blue); background: var(--soft-blue); }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  background: var(--blue);
  color: #fff;
  border-radius: 999px;
  font-weight: 800;
  letter-spacing: .02em;
  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 36px rgba(23,104,232,.28); }
.kicker, .category-badge, .small-label { display: inline-flex; align-items: center; width: fit-content; color: var(--blue); background: var(--soft-blue); border: 1px solid rgba(41,128,254,.18); border-radius: 999px; padding: 6px 12px; font-size: 13px; font-weight: 800; }
.network-manager-hero { padding: 28px 0 48px; }
.hero-shell {
  background: var(--brand-gradient);
  border-radius: 32px;
  padding: 28px;
  color: #fff;
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 28px;
}
.hero-shell:before, .gradient-bg:before { content: ""; position: absolute; inset: -25% 45% 20% -20%; background: rgba(255,255,255,.18); filter: blur(40px); border-radius: 999px; }
.hero-content { position: relative; z-index: 1; }
.hero-content h1 { margin: 14px 0 12px; font-size: clamp(32px, 8vw, 62px); line-height: 1.12; letter-spacing: -.04em; }
.hero-content p { max-width: 650px; margin: 0 0 22px; color: rgba(255,255,255,.86); font-size: 16px; }
.hero-tags, .floating-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags span, .floating-tags span, .tag-row span { border-radius: 999px; padding: 8px 12px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25); font-size: 13px; font-weight: 700; }
.hero-visual { position: relative; z-index: 1; }
.hero-visual .device-card { background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.25); border-radius: 30px; padding: 18px; box-shadow: 0 20px 55px rgba(31,42,89,.22); }
.hero-visual img { border-radius: 24px; margin: 0 auto; }
.float-card { position: relative; margin-top: 12px; background: rgba(255,255,255,.92); color: #27324a; padding: 14px 16px; border-radius: 18px; box-shadow: var(--shadow); font-weight: 750; }
.section { padding: 54px 0; }
.section-head { margin-bottom: 24px; }
.section-head h2, .split-copy h2, .page-title h1 { margin: 10px 0 10px; font-size: clamp(28px, 5vw, 44px); line-height: 1.18; letter-spacing: -.03em; }
.section-head p, .split-copy p, .page-title p, .card p, .bento-card p { color: var(--muted); margin: 0; }
.daily-scenes { display: grid; gap: 16px; }
.scene-card, .card, .bento-card, .faq-item, .risk-card, .step-card, .notice-card, .content-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 22px;
  box-shadow: 0 12px 32px rgba(34, 48, 86, .06);
}
.scene-card h3, .card h3, .bento-card h3, .risk-card h3, .step-card h3 { margin: 10px 0 8px; font-size: 20px; }
.text-link { color: var(--blue); font-weight: 800; display: inline-flex; margin-top: 14px; }
.bento-feature-center { display: grid; gap: 16px; }
.bento-card { min-height: 190px; display: flex; flex-direction: column; justify-content: space-between; }
.bento-card.featured { background: linear-gradient(180deg, #ffffff 0%, #f3f7ff 100%); }
.split-section, .safe-browsing-section, .smart-route-section, .multi-device-section { display: grid; gap: 24px; align-items: center; }
.image-panel { background: var(--soft); border: 1px solid var(--border); border-radius: 32px; padding: 18px; box-shadow: var(--shadow); }
.image-panel img { border-radius: 24px; margin: 0 auto; }
.feature-list, .check-list, .plain-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.feature-list li, .check-list li, .plain-list li { padding-left: 28px; position: relative; color: #475467; }
.feature-list li:before, .check-list li:before, .plain-list li:before { content: ""; position: absolute; left: 0; top: .7em; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 5px rgba(41,128,254,.12); }
.soft-band { background: var(--soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.public-wifi-section { display: grid; gap: 18px; }
.public-wifi-grid, .privacy-guard-section, .network-diagnosis-section, .account-security-section, .risk-grid, .faq-grid, .related-grid, .info-grid { display: grid; gap: 16px; }
.safety-panel { background: #fff; border: 1px solid var(--border); border-radius: 32px; padding: 24px; box-shadow: var(--shadow); }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { position: relative; }
.step-num { width: 38px; height: 38px; border-radius: 14px; display: grid; place-items: center; color: #fff; background: var(--blue); font-weight: 900; }
.risk-card { border-left: 4px solid var(--blue); }
.cta-section { padding: 56px 0; }
.cta-panel { position: relative; overflow: hidden; text-align: center; color: #fff; background: var(--brand-gradient); border-radius: 32px; padding: 34px 22px; }
.cta-panel h2 { margin: 0 0 10px; font-size: clamp(28px, 5vw, 42px); }
.cta-panel p { margin: 0 auto 22px; max-width: 680px; color: rgba(255,255,255,.86); }
.page-hero { padding: 44px 0 28px; background: linear-gradient(180deg, #f5f8ff 0%, #ffffff 100%); }
.page-title { max-width: 780px; }
.article-layout { display: grid; gap: 22px; padding: 34px 0 60px; }
.article-body { display: grid; gap: 18px; }
.article-body p { color: #475467; margin: 0; }
.aside-panel { background: #f8fafc; border: 1px solid var(--border); border-radius: 26px; padding: 20px; height: fit-content; }
.aside-panel h3 { margin-top: 0; }
.notice-card { background: linear-gradient(180deg, #ffffff 0%, #f7fbff 100%); }
.download-area { margin-top: 20px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.site-footer { background: #101828; color: #fff; padding: 36px 0 0; }
.footer-inner { display: grid; gap: 24px; }
.footer-brand { display: flex; gap: 14px; align-items: flex-start; }
.footer-brand img { width: 44px; height: 44px; border-radius: 14px; object-fit: cover; }
.footer-brand p { margin: 6px 0 0; color: rgba(255,255,255,.68); max-width: 560px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; }
.footer-links a { color: rgba(255,255,255,.76); border: 1px solid rgba(255,255,255,.12); border-radius: 999px; padding: 8px 12px; }
.footer-bottom { margin-top: 28px; padding: 16px; border-top: 1px solid rgba(255,255,255,.12); text-align: center; color: rgba(255,255,255,.62); font-size: 13px; }
@media (min-width: 700px) {
  .daily-scenes { grid-template-columns: repeat(3, 1fr); }
  .public-wifi-grid, .privacy-guard-section, .network-diagnosis-section, .account-security-section, .risk-grid, .faq-grid, .related-grid, .info-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .nav-trigger { display: none; }
  .site-nav { position: static; display: flex; align-items: center; padding: 0; border: 0; box-shadow: none; background: transparent; gap: 4px; }
  .hero-shell { grid-template-columns: 1.08fr .92fr; padding: 54px; border-radius: 38px; }
  .hero-content p { font-size: 18px; }
  .bento-feature-center { grid-template-columns: repeat(6, 1fr); grid-auto-rows: 180px; }
  .bento-card { min-height: auto; }
  .bento-card.large { grid-column: span 3; grid-row: span 2; }
  .bento-card.medium { grid-column: span 2; }
  .bento-card.small { grid-column: span 1; }
  .split-section, .safe-browsing-section, .smart-route-section, .multi-device-section { grid-template-columns: 1fr 1fr; }
  .public-wifi-section { grid-template-columns: .95fr 1.05fr; align-items: center; }
  .public-wifi-grid, .privacy-guard-section, .network-diagnosis-section, .account-security-section { grid-template-columns: repeat(3, 1fr); }
  .risk-grid { grid-template-columns: repeat(4, 1fr); }
  .faq-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { grid-template-columns: repeat(3, 1fr); }
  .article-layout { grid-template-columns: minmax(0, 1fr) 330px; align-items: start; }
  .footer-inner { grid-template-columns: 1fr auto; align-items: start; }
}