:root {
  --primary: rgb(70,139,223);
  --primary-dark: #245fbd;
  --primary-soft: #edf6ff;
  --primary-light: #f7fbff;
  --text: #13233a;
  --muted: #5d6b7d;
  --line: rgba(70, 139, 223, .16);
  --card: rgba(255, 255, 255, .92);
  --shadow: 0 14px 38px rgba(24, 72, 126, .10);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(70,139,223,.22), transparent 34rem),
    linear-gradient(180deg, #f4f9ff 0%, #ffffff 44%, #f7fbff 100%);
  line-height: 1.78;
  font-size: 16px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 12px 14px 8px;
  background: rgba(247, 251, 255, .86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(70,139,223,.08);
}
.header-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  letter-spacing: .3px;
  color: #123e76;
  white-space: nowrap;
}
.logo img { width: 34px; height: 34px; border-radius: 12px; }
.mobile-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid rgba(70,139,223,.12);
  border-radius: 999px;
  background: rgba(255,255,255,.72);
}
.mobile-nav a {
  padding: 6px 9px;
  border-radius: 999px;
  font-size: 13px;
  color: #4c5d72;
}
.mobile-nav a.active,
.mobile-nav a:hover {
  color: #fff;
  background: var(--primary);
}
.site-main {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 14px 24px;
}

.banner {
  position: relative;
  overflow: hidden;
  border-radius: 30px;
  padding: 28px 20px;
  background:
    linear-gradient(145deg, rgba(70,139,223,.14), rgba(255,255,255,.92) 48%, rgba(219,237,255,.88)),
    #fff;
  box-shadow: var(--shadow);
  border: 1px solid rgba(70,139,223,.12);
}
.banner::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  right: -70px;
  top: -60px;
  background: rgba(70,139,223,.14);
}
.banner-copy { position: relative; z-index: 2; }
.kicker, .pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(70,139,223,.10);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 700;
}
h1 {
  margin: 14px 0 12px;
  font-size: clamp(28px, 8vw, 46px);
  line-height: 1.16;
  letter-spacing: -1px;
  color: #10243f;
}
h2 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.32;
  letter-spacing: -.2px;
}
h3 { margin: 0 0 8px; font-size: 17px; }
p { margin: 0 0 12px; color: var(--muted); }
.lead { font-size: 17px; color: #3d5068; }

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 24px rgba(70,139,223,.24);
  border: 1px solid rgba(255,255,255,.28);
  transition: transform .18s ease, box-shadow .18s ease;
}
.download-btn:active { transform: translateY(1px) scale(.99); box-shadow: 0 8px 18px rgba(70,139,223,.18); }
.banner-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 18px 0; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.hero-tags span {
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.76);
  border: 1px solid rgba(70,139,223,.12);
  color: #315579;
  font-size: 12px;
  font-weight: 700;
}
.product-visual {
  margin-top: 22px;
  padding: 14px;
  border-radius: 26px;
  background: linear-gradient(180deg, rgba(255,255,255,.72), rgba(237,246,255,.74));
  border: 1px solid rgba(70,139,223,.12);
}
.product-visual img { width: min(320px, 78vw); margin: 0 auto; filter: drop-shadow(0 22px 30px rgba(31,86,150,.16)); }

.section {
  margin: 20px 0;
  padding: 20px;
  border-radius: var(--radius);
  background: rgba(255,255,255,.76);
  border: 1px solid rgba(70,139,223,.10);
  box-shadow: 0 10px 28px rgba(24,72,126,.06);
}
.section.soft {
  background: linear-gradient(180deg, rgba(237,246,255,.92), rgba(255,255,255,.82));
}
.section-title { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.badge {
  display: inline-block;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 800;
  font-size: 12px;
}
.card-grid, .feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.card, .feature-card, .note-card {
  padding: 16px;
  border-radius: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: 0 8px 22px rgba(24,72,126,.05);
}
.feature-card b, .card b { display: block; margin-bottom: 6px; color: #17395f; }
.feature-icon {
  width: 36px;
  height: 36px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 10px;
  color: #fff;
  background: var(--primary);
  font-weight: 900;
}
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
}
.stat {
  padding: 12px 8px;
  border-radius: 16px;
  background: rgba(70,139,223,.08);
  text-align: center;
}
.stat strong { display: block; color: var(--primary-dark); font-size: 18px; line-height: 1.2; }
.stat span { display: block; color: #64758a; font-size: 12px; }
.step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.step-list li {
  position: relative;
  margin: 0 0 12px;
  padding: 14px 14px 14px 52px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--line);
}
.step-list li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--primary);
  font-weight: 800;
}
.faq-item {
  padding: 15px 0;
  border-bottom: 1px solid rgba(70,139,223,.12);
}
.faq-item:last-child { border-bottom: 0; padding-bottom: 0; }
.faq-item h3 { color: #17395f; }
.cta-panel {
  text-align: center;
  padding: 24px 18px;
  border-radius: 26px;
  background: linear-gradient(135deg, rgba(70,139,223,.13), rgba(255,255,255,.92));
  border: 1px solid rgba(70,139,223,.14);
  box-shadow: var(--shadow);
}
.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.inline-links a {
  padding: 8px 11px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: #315579;
  font-size: 13px;
  font-weight: 700;
}
.site-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 10px 14px 34px;
}
.footer-card {
  padding: 18px;
  border-radius: 22px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 10px 24px rgba(24,72,126,.06);
}
.footer-card strong { color: #17395f; }
.footer-link { color: var(--primary-dark); font-weight: 800; }
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0;
}
.footer-nav a {
  color: #516276;
  background: rgba(255,255,255,.72);
  border: 1px solid var(--line);
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 13px;
}
.copyright { font-size: 12px; color: #8492a5; }
.desktop-gate {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: grid;
  place-items: center;
  padding: 24px;
  background: linear-gradient(180deg, rgba(247,251,255,.96), rgba(232,243,255,.98));
}
.desktop-gate__card {
  max-width: 360px;
  padding: 26px 24px;
  border-radius: 28px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  text-align: center;
}
.desktop-gate__logo { width: 58px; height: 58px; border-radius: 18px; margin: 0 auto 14px; }
.desktop-gate__card strong { display: block; font-size: 22px; color: #17395f; margin-bottom: 8px; }
.desktop-locked .download-btn { display: none !important; }
.desktop-locked .site-header,
.desktop-locked .site-main,
.desktop-locked .site-footer { pointer-events: none; }

@media (min-width: 640px) {
  .banner { display: grid; grid-template-columns: 1.08fr .92fr; gap: 16px; align-items: center; }
  .product-visual { margin-top: 0; }
  .feature-grid, .card-grid { grid-template-columns: repeat(2, 1fr); }
  .mobile-nav a { padding-left: 13px; padding-right: 13px; }
}