* {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-dark: #1d4f91;
  --primary-soft: #eaf3ff;
  --text: #172033;
  --muted: #667085;
  --line: #e6edf7;
  --card: #ffffff;
  --bg: #f6faff;
  --radius: 22px;
  --shadow: 0 16px 40px rgba(28, 65, 120, .08);
}

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, #f7fbff 0%, #ffffff 42%, #f7fbff 100%);
  line-height: 1.72;
  overflow-x: hidden;
}

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

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

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(216, 228, 244, .75);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: .2px;
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(70,139,223,.2);
}

.brand-text {
  font-size: 20px;
}

.nav-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  display: grid;
  place-items: center;
  gap: 4px;
  padding: 10px;
}

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

.site-nav {
  position: absolute;
  top: 72px;
  left: 16px;
  right: 16px;
  display: none;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  box-shadow: var(--shadow);
}

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

.site-nav a {
  padding: 12px 14px;
  border-radius: 12px;
  color: #344054;
  font-weight: 600;
}

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

.hero {
  padding: 56px 0 40px;
  background:
    radial-gradient(circle at 10% 10%, rgba(70,139,223,.18), transparent 28%),
    radial-gradient(circle at 90% 20%, rgba(70,139,223,.12), transparent 30%);
}

.hero-grid {
  display: grid;
  gap: 32px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: #edf6ff;
  font-size: 14px;
  font-weight: 700;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(70,139,223,.12);
}

h1, h2, h3 {
  line-height: 1.25;
  margin: 0 0 14px;
  color: #101828;
}

h1 {
  font-size: clamp(32px, 8vw, 58px);
  letter-spacing: -1.4px;
}

h2 {
  font-size: clamp(26px, 5vw, 40px);
  letter-spacing: -.7px;
}

h3 {
  font-size: 20px;
}

p {
  margin: 0 0 16px;
  color: var(--muted);
}

.lead {
  font-size: 18px;
  color: #44546a;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 26px;
}

.download-btn {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  border-radius: 999px;
  border: 0;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  letter-spacing: .2px;
  box-shadow: 0 14px 28px rgba(70,139,223,.28);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
  transform: translateY(-2px);
  background: #367ed3;
  box-shadow: 0 18px 34px rgba(70,139,223,.34);
}

.trust-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.trust-tags span,
.badge {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: rgba(70,139,223,.1);
  border: 1px solid rgba(70,139,223,.16);
  font-size: 14px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  padding: 20px;
  border-radius: 32px;
  background: linear-gradient(145deg, #ffffff, #eaf4ff);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-visual::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -70px;
  bottom: -70px;
  border-radius: 50%;
  background: rgba(70,139,223,.14);
}

.hero-visual img {
  position: relative;
  z-index: 1;
  width: min(320px, 92%);
  margin: 0 auto;
  filter: drop-shadow(0 24px 36px rgba(33, 84, 150, .16));
}

.section {
  padding: 54px 0;
}

.section-header {
  max-width: 760px;
  margin-bottom: 28px;
}

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

.card,
.info-card,
.faq-item,
.article-card {
  background: var(--card);
  border: 1px solid rgba(216, 228, 244, .85);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card {
  padding: 24px;
}

.card p:last-child,
.info-card p:last-child,
.article-card p:last-child,
.faq-item p:last-child {
  margin-bottom: 0;
}

.feature-grid,
.card-grid {
  display: grid;
  gap: 18px;
}

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

.feature-card::before {
  content: "";
  display: block;
  width: 46px;
  height: 46px;
  margin-bottom: 16px;
  border-radius: 15px;
  background: linear-gradient(135deg, rgba(70,139,223,.22), rgba(70,139,223,.06));
  border: 1px solid rgba(70,139,223,.14);
}

.split {
  display: grid;
  gap: 24px;
  align-items: center;
}

.info-card {
  padding: 24px;
  background: linear-gradient(180deg, #ffffff, #f4f9ff);
}

.steps {
  counter-reset: step;
  display: grid;
  gap: 14px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding: 18px 18px 18px 62px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #fff;
  color: #475467;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 18px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: var(--primary);
  font-weight: 800;
}

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

.faq-item {
  padding: 22px;
}

.faq-item h2,
.faq-item h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.article-hero {
  padding: 48px 0 22px;
}

.article-wrap {
  display: grid;
  gap: 24px;
  padding-bottom: 54px;
}

.article-card {
  padding: 24px;
}

.notice {
  padding: 18px;
  border-radius: 18px;
  background: #eef6ff;
  border: 1px solid rgba(70,139,223,.18);
  color: #315f98;
}

.cta {
  padding: 34px;
  border-radius: 28px;
  background: linear-gradient(135deg, rgba(70,139,223,.98), rgba(95,166,239,.88));
  color: #fff;
  box-shadow: 0 18px 44px rgba(70,139,223,.24);
}

.cta h2,
.cta p {
  color: #fff;
}

.cta .download-btn {
  background: #fff;
  color: var(--primary);
  box-shadow: none;
}

.site-footer {
  padding: 44px 0 24px;
  color: #dbe8f7;
  background: #10233f;
}

.site-footer p,
.site-footer a,
.footer-bottom {
  color: rgba(219, 232, 247, .82);
}

.footer-grid {
  display: grid;
  gap: 28px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-logo {
  width: 34px;
  height: 34px;
  border-radius: 10px;
}

.site-footer h3 {
  color: #fff;
  font-size: 16px;
}

.site-footer a {
  display: block;
  padding: 5px 0;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 32px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.12);
  font-size: 14px;
}

@media (min-width: 640px) {
  .container {
    width: min(1120px, calc(100% - 48px));
  }

  .feature-grid,
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

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

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

  .site-nav a {
    padding: 10px 13px;
  }

  .hero {
    padding: 82px 0 70px;
  }

  .hero-grid,
  .split {
    grid-template-columns: 1.05fr .95fr;
  }

  .section {
    padding: 74px 0;
  }

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

  .article-wrap {
    grid-template-columns: 1fr 340px;
    align-items: start;
  }

  .article-main {
    min-width: 0;
  }

  .article-side {
    position: sticky;
    top: 96px;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (min-width: 1180px) {
  .container {
    width: min(1180px, calc(100% - 64px));
  }
}