* {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-dark: #255fba;
  --primary-soft: #edf6ff;
  --text: #17304f;
  --muted: #667892;
  --line: rgba(70,139,223,.16);
  --card: rgba(255,255,255,.92);
  --shadow: 0 16px 46px rgba(46, 92, 151, .12);
  --radius: 22px;
}

html {
  min-height: 100%;
  background: linear-gradient(180deg, #f3f9ff 0%, #ffffff 46%, #f6fbff 100%);
}

body {
  margin: 0;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  background:
    radial-gradient(circle at 12% 2%, rgba(70,139,223,.16), transparent 28%),
    radial-gradient(circle at 88% 14%, rgba(70,139,223,.12), transparent 24%),
    linear-gradient(180deg, #f5fbff 0%, #fff 52%, #f8fbff 100%);
}

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

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

.site-shell {
  width: 100%;
  max-width: 560px;
  min-height: 100vh;
  margin: 0 auto;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(255,255,255,.72), rgba(255,255,255,.96));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  padding: 14px 16px 10px;
  background: rgba(247, 251, 255, .88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(70,139,223,.1);
}

.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 800;
  font-size: 18px;
  letter-spacing: .3px;
}

.logo img {
  width: 34px;
  height: 34px;
  border-radius: 11px;
  box-shadow: 0 8px 20px rgba(70,139,223,.18);
}

.mobile-nav {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  padding-bottom: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav::-webkit-scrollbar {
  display: none;
}

.mobile-nav a {
  flex: 0 0 auto;
  padding: 7px 12px;
  border-radius: 999px;
  color: #31506f;
  background: rgba(255,255,255,.78);
  border: 1px solid rgba(70,139,223,.12);
  font-size: 13px;
  white-space: nowrap;
}

.site-content {
  padding: 16px;
}

.hero {
  position: relative;
  padding: 22px 0 8px;
}

.hero-grid {
  display: grid;
  gap: 20px;
  align-items: center;
}

.eyebrow,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: rgba(70,139,223,.1);
  border: 1px solid rgba(70,139,223,.14);
  font-size: 12px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  color: #142c4c;
  line-height: 1.25;
  letter-spacing: -.02em;
}

h1 {
  margin-top: 12px;
  font-size: 30px;
}

h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

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

.lead {
  margin-top: 14px;
  color: #47617e;
  font-size: 16px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  margin-top: 20px;
  padding: 0 26px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 12px 28px rgba(70,139,223,.28);
  border: 1px solid rgba(255,255,255,.28);
}

.download-btn:active {
  transform: translateY(1px);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.hero-tags span {
  padding: 6px 10px;
  border-radius: 999px;
  background: #fff;
  color: #355979;
  border: 1px solid var(--line);
  font-size: 12px;
  box-shadow: 0 8px 22px rgba(70,139,223,.07);
}

.phone-stage {
  position: relative;
  margin: 4px auto 0;
  padding: 16px;
  min-height: 280px;
  border-radius: 30px;
  background:
    linear-gradient(145deg, rgba(70,139,223,.16), rgba(255,255,255,.9)),
    radial-gradient(circle at 20% 10%, rgba(70,139,223,.24), transparent 32%);
  border: 1px solid rgba(70,139,223,.12);
  box-shadow: var(--shadow);
}

.phone-stage img {
  width: 72%;
  margin: 0 auto;
  filter: drop-shadow(0 26px 30px rgba(41,76,122,.2));
}

.floating-card {
  position: absolute;
  right: 18px;
  bottom: 18px;
  width: 152px;
  padding: 12px;
  border-radius: 18px;
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(70,139,223,.16);
  box-shadow: 0 18px 40px rgba(46,92,151,.14);
}

.floating-card strong {
  display: block;
  color: #17304f;
  font-size: 14px;
}

.floating-card small {
  color: var(--muted);
  font-size: 12px;
}

.section {
  margin-top: 28px;
  padding: 22px 0 4px;
}

.section-head {
  margin-bottom: 14px;
}

.section-head p {
  margin-top: 8px;
}

.card,
.info-card,
.faq-item {
  padding: 18px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid rgba(70,139,223,.12);
  box-shadow: 0 14px 36px rgba(70,139,223,.08);
}

.card + .card,
.info-card + .info-card,
.faq-item + .faq-item {
  margin-top: 12px;
}

.card p,
.info-card p,
.faq-item p {
  margin-top: 6px;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.feature-card {
  padding: 17px;
  border-radius: 20px;
  background: linear-gradient(180deg, #ffffff, #f4f9ff);
  border: 1px solid var(--line);
  box-shadow: 0 10px 26px rgba(70,139,223,.07);
}

.feature-card .icon {
  width: 34px;
  height: 34px;
  margin-bottom: 10px;
  border-radius: 12px;
  background: rgba(70,139,223,.12);
  display: grid;
  place-items: center;
  color: var(--primary);
  font-weight: 900;
}

.step-list {
  display: grid;
  gap: 12px;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 16px 16px 16px 54px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 10px 28px rgba(70,139,223,.07);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 17px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: var(--primary);
  font-weight: 800;
  font-size: 13px;
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
  margin-top: 16px;
}

.data-box {
  padding: 12px 8px;
  border-radius: 18px;
  text-align: center;
  background: rgba(255,255,255,.9);
  border: 1px solid var(--line);
}

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

.data-box span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
}

.notice {
  padding: 16px;
  border-radius: 20px;
  color: #31506f;
  background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.9));
  border: 1px solid rgba(70,139,223,.15);
}

.notice strong {
  display: block;
  margin-bottom: 6px;
  color: #17304f;
}

.cta-panel {
  margin-top: 24px;
  padding: 22px;
  border-radius: 26px;
  background:
    linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.96)),
    radial-gradient(circle at 80% 5%, rgba(70,139,223,.2), transparent 34%);
  border: 1px solid rgba(70,139,223,.14);
  box-shadow: var(--shadow);
}

.page-hero {
  margin-top: 8px;
  padding: 24px 18px;
  border-radius: 28px;
  background: linear-gradient(145deg, rgba(70,139,223,.14), rgba(255,255,255,.94));
  border: 1px solid rgba(70,139,223,.14);
  box-shadow: var(--shadow);
}

.page-hero .download-btn {
  margin-top: 18px;
}

.article-body {
  display: grid;
  gap: 13px;
  margin-top: 18px;
}

.link-list {
  display: grid;
  gap: 10px;
}

.link-list a {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--line);
  color: #31506f;
  font-weight: 700;
}

.faq-item h3 {
  font-size: 16px;
}

.site-footer {
  margin-top: 22px;
  padding: 24px 16px calc(28px + env(safe-area-inset-bottom));
  border-top: 1px solid rgba(70,139,223,.12);
  background: rgba(248, 252, 255, .88);
}

.footer-brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.footer-brand img {
  width: 40px;
  height: 40px;
  border-radius: 14px;
}

.footer-brand strong {
  color: #17304f;
}

.footer-brand p {
  margin-top: 2px;
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.footer-links a {
  padding: 7px 10px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: #3d5b78;
  font-size: 13px;
}

.copyright {
  margin-top: 16px;
  font-size: 12px;
  color: #7b8ba1;
}

.desktop-only-notice {
  display: none;
}

body.desktop-locked .desktop-only-notice {
  display: grid;
  position: sticky;
  top: 0;
  z-index: 80;
  padding: 18px;
  background: rgba(246, 251, 255, .96);
  border-bottom: 1px solid rgba(70,139,223,.16);
}

.desktop-card {
  width: min(560px, 100%);
  margin: 0 auto;
  padding: 18px;
  border-radius: 24px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  text-align: center;
}

.desktop-card strong {
  display: block;
  margin-top: 8px;
  color: #17304f;
  font-size: 22px;
}

.desktop-card p {
  margin-top: 8px;
  font-size: 14px;
}

.desktop-logo {
  width: 48px;
  height: 48px;
  margin: 0 auto;
  border-radius: 16px;
}

body.desktop-locked .site-shell {
  max-width: 680px;
}

body.desktop-locked .download-btn {
  display: none !important;
}

body.desktop-locked .site-content {
  max-height: 900px;
  overflow: hidden;
  opacity: .72;
}

@media (min-width: 520px) {
  .site-content {
    padding: 20px;
  }

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

  h1 {
    font-size: 34px;
  }
}