* {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-dark: #1e5fa9;
  --primary-soft: #eef6ff;
  --ink: #14243a;
  --muted: #5f7089;
  --line: #dce8f7;
  --card: #ffffff;
  --bg: #f5f9ff;
  --shadow: 0 18px 48px rgba(50, 100, 160, 0.14);
  --radius: 22px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background:
    radial-gradient(circle at 10% 0%, rgba(70,139,223,.16), transparent 34rem),
    linear-gradient(180deg, #f8fbff 0%, #eef6ff 48%, #ffffff 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;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(220,232,247,.72);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: .02em;
}

.brand img,
.footer-brand img {
  width: 38px;
  height: 38px;
  border-radius: 12px;
}

.site-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 72px;
  display: none;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.site-nav.is-open {
  display: grid;
  gap: 8px;
}

.site-nav a {
  padding: 10px 12px;
  border-radius: 12px;
  color: #29415f;
  font-size: 15px;
}

.site-nav a:hover {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.nav-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  display: grid;
  place-items: center;
  gap: 3px;
  padding: 10px;
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  display: block;
  background: var(--primary-dark);
  border-radius: 99px;
}

.hero {
  padding: 48px 0 28px;
}

.hero-layout {
  display: grid;
  gap: 34px;
  align-items: center;
}

.eyebrow,
.badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid rgba(70,139,223,.24);
  border-radius: 999px;
  background: rgba(255,255,255,.74);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
h3 {
  line-height: 1.25;
  margin: 0 0 14px;
}

h1 {
  font-size: clamp(32px, 8vw, 60px);
  letter-spacing: -0.045em;
}

h2 {
  font-size: clamp(26px, 5vw, 40px);
  letter-spacing: -0.03em;
}

h3 {
  font-size: 20px;
}

.lead {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 17px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  min-width: 138px;
  padding: 13px 24px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), #7cb8ff);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 14px 28px rgba(70,139,223,.28);
  transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(70,139,223,.34);
}

.hero-tags,
.inline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 7px 11px;
  background: #fff;
  border: 1px solid var(--line);
  color: #405773;
  font-size: 13px;
  font-weight: 650;
}

.product-stage {
  position: relative;
  min-height: 440px;
  display: grid;
  place-items: center;
  padding: 18px;
  border-radius: 32px;
  background: linear-gradient(145deg, rgba(255,255,255,.96), rgba(233,244,255,.86));
  border: 1px solid rgba(255,255,255,.7);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.product-stage:before {
  content: "";
  position: absolute;
  inset: 38px;
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(70,139,223,.18), rgba(255,255,255,.22));
  transform: rotate(-8deg);
}

.product-stage .app-shot {
  position: relative;
  z-index: 2;
  width: min(260px, 72%);
  filter: drop-shadow(0 24px 34px rgba(33, 91, 150, .24));
  border-radius: 28px;
}

.float-card {
  position: absolute;
  z-index: 3;
  width: min(230px, 72%);
  padding: 14px;
  border: 1px solid rgba(220,232,247,.82);
  border-radius: 18px;
  background: rgba(255,255,255,.84);
  backdrop-filter: blur(14px);
  box-shadow: 0 16px 34px rgba(49, 98, 160, .15);
}

.float-card strong {
  display: block;
  font-size: 15px;
}

.float-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.status-card {
  left: 12px;
  bottom: 24px;
}

.key-card {
  top: 24px;
  right: 14px;
}

.verify-card {
  right: 10px;
  bottom: 102px;
}

.protect-card {
  left: 26px;
  top: 44px;
}

.section {
  padding: 48px 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 24px;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.trust-strip {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.trust-item,
.category-card,
.feature-card,
.step-card,
.scenario-card,
.faq-item,
.info-card,
.page-card,
.download-panel {
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(220,232,247,.86);
  border-radius: var(--radius);
  box-shadow: 0 14px 36px rgba(46, 95, 155, .09);
}

.trust-item {
  padding: 18px;
}

.trust-item strong {
  display: block;
  color: var(--primary-dark);
  font-size: 18px;
}

.trust-item span {
  color: var(--muted);
  font-size: 14px;
}

.category-grid,
.feature-grid,
.scenario-grid,
.faq-grid,
.related-grid {
  display: grid;
  gap: 16px;
}

.category-card,
.feature-card,
.scenario-card,
.info-card,
.page-card {
  padding: 22px;
}

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

.category-card:after {
  content: "";
  position: absolute;
  width: 96px;
  height: 96px;
  right: -28px;
  top: -28px;
  border-radius: 50%;
  background: rgba(70,139,223,.12);
}

.category-card small {
  color: var(--primary);
  font-weight: 800;
}

.category-card p,
.feature-card p,
.scenario-card p,
.info-card p,
.page-card p,
.faq-item p {
  color: var(--muted);
  margin: 8px 0 0;
}

.category-card:hover,
.feature-card:hover,
.scenario-card:hover {
  transform: translateY(-3px);
  transition: .2s ease;
  box-shadow: 0 18px 44px rgba(46, 95, 155, .13);
}

.split-layout,
.security-layout,
.page-layout {
  display: grid;
  gap: 22px;
  align-items: center;
}

.soft-panel {
  padding: 26px;
  border-radius: 28px;
  background: linear-gradient(145deg, #ffffff, #edf6ff);
  border: 1px solid rgba(220,232,247,.88);
  box-shadow: var(--shadow);
}

.security-cards {
  display: grid;
  gap: 14px;
}

.security-card {
  padding: 18px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--line);
}

.security-card strong {
  color: var(--primary-dark);
}

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

.step-card {
  position: relative;
  padding: 22px;
}

.step-card:before {
  counter-increment: step;
  content: counter(step);
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  margin-bottom: 12px;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 800;
}

.faq-item {
  padding: 18px;
}

.faq-item h3 {
  font-size: 17px;
}

.cta-section {
  margin: 44px auto 0;
  padding: 30px;
  text-align: center;
  border-radius: 30px;
  background:
    radial-gradient(circle at top right, rgba(70,139,223,.20), transparent 22rem),
    linear-gradient(135deg, #ffffff, #eaf5ff);
  border: 1px solid rgba(220,232,247,.9);
  box-shadow: var(--shadow);
}

.breadcrumb {
  padding: 26px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--primary-dark);
  font-weight: 700;
}

.page-hero {
  padding: 46px 0 24px;
}

.page-hero .lead {
  max-width: 820px;
}

.content-block {
  padding: 26px;
  border-radius: 26px;
  background: rgba(255,255,255,.86);
  border: 1px solid rgba(220,232,247,.86);
  box-shadow: 0 14px 34px rgba(46, 95, 155, .08);
}

.content-block p {
  color: var(--muted);
}

.note-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 16px 0 0;
  list-style: none;
}

.note-list li {
  padding: 12px 14px;
  border-radius: 14px;
  background: var(--primary-soft);
  color: #31516f;
  border: 1px solid rgba(70,139,223,.14);
}

.download-panel {
  padding: 26px;
  margin-top: 22px;
  display: grid;
  gap: 14px;
  align-items: center;
}

.site-footer {
  margin-top: 48px;
  padding: 42px 0 22px;
  background: #f3f8ff;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  gap: 24px;
}

.site-footer p,
.site-footer a,
.footer-bottom {
  color: var(--muted);
  font-size: 14px;
}

.site-footer a {
  display: block;
  margin: 7px 0;
}

.footer-bottom {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 8px;
}

@media (min-width: 640px) {
  .trust-strip,
  .category-grid,
  .feature-grid,
  .scenario-grid,
  .faq-grid,
  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .download-panel {
    grid-template-columns: 1fr auto;
  }
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }

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

  .hero {
    padding: 76px 0 40px;
  }

  .hero-layout,
  .split-layout,
  .security-layout,
  .page-layout {
    grid-template-columns: 1.02fr .98fr;
  }

  .category-grid,
  .feature-grid,
  .scenario-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .footer-grid {
    grid-template-columns: 1.6fr 1fr 1fr;
  }

  .footer-bottom {
    grid-template-columns: 1fr auto;
  }
}

@media (min-width: 1100px) {
  .product-stage {
    min-height: 520px;
  }

  .product-stage .app-shot {
    width: 300px;
  }
}