:root {
  --primary: rgb(70,139,223);
  --primary-dark: #256db8;
  --primary-soft: #eaf4ff;
  --text: #14223a;
  --muted: #66758c;
  --line: #d9e7f7;
  --panel: rgba(255,255,255,0.88);
  --bg: #f5f9ff;
  --shadow: 0 16px 45px rgba(44, 91, 150, 0.12);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f2f8ff 0%, #ffffff 42%, #f7fbff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 32px, 1160px); margin: 0 auto; }
.section { padding: 56px 0; }
.section-tight { padding: 36px 0; }
.section-title { margin: 0 0 12px; font-size: clamp(26px, 4vw, 42px); line-height: 1.22; letter-spacing: -0.02em; }
.section-lead { margin: 0 0 28px; color: var(--muted); max-width: 760px; }
.eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(70,139,223,0.1);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(217,231,247,0.85);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo-wrap { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.logo-img { width: 38px; height: 38px; object-fit: contain; border-radius: 12px; }
.logo-text { letter-spacing: 0.02em; }
.nav-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0 10px;
}
.nav-toggle span { height: 2px; background: var(--text); border-radius: 2px; }
.site-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 74px;
  display: none;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #42516a;
  font-size: 15px;
  font-weight: 650;
}
.site-nav a:hover, .site-nav a.active { color: var(--primary-dark); background: var(--primary-soft); }

.hero {
  position: relative;
  padding: 54px 0 42px;
  overflow: hidden;
}
.hero:before {
  content: "";
  position: absolute;
  inset: -120px -140px auto auto;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(70,139,223,0.22), transparent 64%);
  pointer-events: none;
}
.hero-layout { display: grid; gap: 34px; align-items: center; }
.hero h1 { margin: 18px 0 16px; font-size: clamp(34px, 8vw, 60px); line-height: 1.08; letter-spacing: -0.045em; }
.hero-desc { margin: 0 0 24px; color: #53647d; font-size: 17px; max-width: 620px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 26px; }
.hero-tags span, .mini-tag {
  padding: 7px 11px;
  border: 1px solid rgba(70,139,223,0.22);
  border-radius: 999px;
  background: rgba(255,255,255,0.75);
  color: #2b5e99;
  font-size: 13px;
  font-weight: 650;
}
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  box-shadow: 0 12px 24px rgba(70,139,223,0.25);
  font-size: 16px;
  font-weight: 800;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 16px 30px rgba(70,139,223,0.28); }
.hero-visual {
  position: relative;
  min-height: 430px;
  padding: 20px;
  border-radius: 32px;
  background: linear-gradient(145deg, rgba(255,255,255,0.78), rgba(232,244,255,0.92));
  border: 1px solid rgba(210,230,249,0.9);
  box-shadow: var(--shadow);
}
.product-shell {
  width: min(270px, 80%);
  margin: 10px auto 0;
  padding: 16px;
  border-radius: 28px;
  background: #fff;
  box-shadow: 0 20px 50px rgba(54,94,145,0.15);
}
.product-shell img { border-radius: 22px; width: 100%; min-height: 290px; object-fit: cover; background: linear-gradient(180deg, #eef7ff, #fff); }
.status-card, .floating-card {
  position: relative;
  margin-top: 16px;
  padding: 16px;
  border-radius: 20px;
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(217,231,247,0.9);
  box-shadow: 0 12px 28px rgba(55,87,128,0.10);
}
.status-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 6px rgba(70,139,223,0.15); }
.visual-labels { display: grid; gap: 10px; margin-top: 14px; }
.visual-labels span { padding: 10px 12px; border-radius: 14px; background: rgba(70,139,223,0.08); color: #2a5f9f; font-weight: 700; font-size: 14px; }

.trust-grid, .feature-grid, .category-grid, .scenario-grid, .article-grid { display: grid; gap: 16px; }
.trust-grid { grid-template-columns: 1fr; }
.trust-item, .feature-card, .category-card, .scenario-card, .info-card, .faq-item, .article-card, .step-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(52,91,135,0.08);
}
.trust-item { padding: 20px; }
.trust-item strong { display: block; font-size: 18px; margin-bottom: 6px; }
.trust-item p, .feature-card p, .category-card p, .scenario-card p, .info-card p, .article-card p, .step-card p { margin: 0; color: var(--muted); }

.category-card { padding: 22px; transition: transform .2s ease, border-color .2s ease; }
.category-card:hover { transform: translateY(-4px); border-color: rgba(70,139,223,0.5); }
.category-card h3, .feature-card h3, .scenario-card h3, .info-card h3, .article-card h3, .step-card h3 { margin: 0 0 8px; font-size: 20px; }
.category-card .link { display: inline-flex; margin-top: 16px; color: var(--primary-dark); font-weight: 800; }
.feature-card { padding: 24px; }
.feature-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  border-radius: 14px;
  background: linear-gradient(145deg, rgba(70,139,223,0.16), rgba(70,139,223,0.05));
  color: var(--primary-dark);
  font-weight: 900;
}
.security-layout, .split-layout { display: grid; gap: 24px; align-items: center; }
.security-panel {
  padding: 26px;
  border-radius: 28px;
  background: linear-gradient(145deg, #ffffff, #eef7ff);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.security-list { display: grid; gap: 12px; margin: 18px 0 0; padding: 0; list-style: none; }
.security-list li {
  padding: 13px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,0.75);
  border: 1px solid rgba(217,231,247,0.8);
  color: #3a4b63;
}
.steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { padding: 22px; position: relative; }
.step-card:before {
  counter-increment: step;
  content: counter(step);
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: 12px;
  color: #fff;
  background: var(--primary);
  font-weight: 900;
}
.scenario-card, .article-card, .info-card { padding: 22px; }
.soft-block {
  padding: 28px;
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(70,139,223,0.10), rgba(255,255,255,0.9));
  border: 1px solid var(--line);
}
.faq-list { display: grid; gap: 14px; }
.faq-item { padding: 20px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
  text-align: center;
  padding: 38px 24px;
  border-radius: 32px;
  background: linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.95));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.cta-section p { color: var(--muted); max-width: 720px; margin: 0 auto 22px; }

.page-hero {
  padding: 48px 0 28px;
  background: linear-gradient(180deg, rgba(70,139,223,0.09), rgba(255,255,255,0));
}
.page-hero h1 { margin: 16px 0 12px; font-size: clamp(30px, 6vw, 48px); line-height: 1.16; letter-spacing: -0.03em; }
.page-hero p { color: var(--muted); max-width: 780px; margin: 0; }
.article-layout { display: grid; gap: 22px; align-items: start; }
.article-main {
  padding: 26px;
  border-radius: 28px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 14px 36px rgba(52,91,135,0.08);
}
.article-main h2 { margin: 0 0 12px; font-size: 24px; }
.article-main p { color: #4f6076; margin: 0 0 16px; }
.article-main p:last-child { margin-bottom: 0; }
.sidebar-panel { padding: 22px; border-radius: 24px; background: #f3f9ff; border: 1px solid var(--line); }
.sidebar-panel h3 { margin: 0 0 10px; }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.check-list li { padding-left: 24px; position: relative; color: #4f6076; }
.check-list li:before { content: ""; position: absolute; left: 0; top: 9px; width: 9px; height: 9px; border-radius: 50%; background: var(--primary); }
.download-panel { margin-top: 22px; padding: 22px; border-radius: 24px; background: linear-gradient(135deg, rgba(70,139,223,0.10), #fff); border: 1px solid var(--line); }
.download-panel p { margin: 0 0 16px; color: var(--muted); }
.notice { padding: 16px; border-radius: 18px; background: #f5faff; border: 1px solid var(--line); color: #42516a; }

.download-flow { display: grid; gap: 14px; margin-top: 22px; }
.download-single { display: flex; justify-content: center; margin: 28px 0; }

.site-footer { margin-top: 56px; padding: 42px 0 24px; background: #eef6ff; border-top: 1px solid var(--line); }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-size: 22px; font-weight: 900; margin-bottom: 10px; }
.site-footer p { color: var(--muted); margin: 0; }
.site-footer h3 { margin: 0 0 10px; font-size: 16px; }
.site-footer a { display: block; color: #52657e; margin: 6px 0; }
.footer-bottom { display: flex; flex-direction: column; gap: 8px; margin-top: 28px; padding-top: 20px; border-top: 1px solid rgba(70,139,223,0.15); color: #66758c; font-size: 14px; }

@media (min-width: 640px) {
  .container { width: min(100% - 48px, 1160px); }
  .trust-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-grid, .feature-grid, .scenario-grid, .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
  .site-nav a { padding: 9px 12px; }
  .hero { padding: 78px 0 58px; }
  .hero-layout { grid-template-columns: minmax(0, 1.04fr) minmax(360px, 0.96fr); gap: 54px; }
  .hero-visual { min-height: 520px; }
  .status-card { position: absolute; left: 18px; bottom: 34px; width: 220px; margin: 0; }
  .floating-card { position: absolute; right: 18px; top: 56px; width: 210px; margin: 0; }
  .visual-labels { position: absolute; right: 22px; bottom: 36px; width: 225px; }
  .trust-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .category-grid, .feature-grid, .scenario-grid, .article-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .security-layout, .split-layout, .article-layout { grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr); }
  .steps { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (max-width: 420px) {
  .download-btn { width: 100%; }
  .hero-visual { min-height: auto; }
  .product-shell { width: 92%; }
  .article-main, .security-panel, .soft-block { padding: 20px; }
}