* {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-dark: #235da8;
  --primary-soft: #eaf4ff;
  --ink: #13233a;
  --muted: #5d6b7f;
  --line: rgba(70, 139, 223, .14);
  --card: rgba(255,255,255,.92);
  --shadow: 0 14px 34px rgba(34, 93, 168, .10);
  --radius: 22px;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 4%, rgba(70,139,223,.18), transparent 28%),
    radial-gradient(circle at 88% 0%, rgba(70,139,223,.14), transparent 32%),
    linear-gradient(180deg, #f4faff 0%, #ffffff 45%, #f7fbff 100%);
  line-height: 1.72;
  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: 10px 14px 8px;
  background: rgba(247, 251, 255, .82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(70,139,223,.10);
}

.header-inner {
  max-width: 520px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: .2px;
  color: #102743;
}

.logo {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(70,139,223,.18);
}

.mobile-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 10px;
}

.mobile-nav a {
  text-align: center;
  padding: 8px 6px;
  border: 1px solid rgba(70,139,223,.12);
  background: rgba(255,255,255,.72);
  border-radius: 999px;
  color: #31506f;
  font-size: 13px;
}

main {
  max-width: 520px;
  margin: 0 auto;
  padding: 16px 14px 36px;
}

.banner,
.page-hero {
  position: relative;
  overflow: hidden;
  border-radius: 28px;
  padding: 24px 20px;
  background:
    linear-gradient(145deg, rgba(255,255,255,.96), rgba(234,244,255,.88)),
    radial-gradient(circle at 100% 10%, rgba(70,139,223,.28), transparent 32%);
  box-shadow: var(--shadow);
  border: 1px solid rgba(70,139,223,.13);
}

.banner {
  min-height: 510px;
}

.banner-content {
  position: relative;
  z-index: 2;
}

.kicker,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(70,139,223,.10);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 12px;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.22;
  color: #102743;
}

h1 {
  font-size: 30px;
  letter-spacing: -0.8px;
}

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

h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.lead {
  margin: 14px 0 18px;
  color: #48617b;
  font-size: 16px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  min-width: 142px;
  padding: 0 22px;
  border-radius: 999px;
  background: rgb(70,139,223);
  color: #fff;
  font-weight: 800;
  box-shadow: 0 14px 28px rgba(70,139,223,.26);
  border: 1px solid rgba(255,255,255,.28);
  letter-spacing: .3px;
}

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

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
}

.tag-row span {
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.72);
  border: 1px solid rgba(70,139,223,.13);
  color: #31506f;
  font-size: 12px;
}

.product-visual {
  position: absolute;
  right: -16px;
  bottom: -10px;
  width: 220px;
  z-index: 1;
  filter: drop-shadow(0 26px 34px rgba(35,93,168,.18));
}

.visual-card {
  position: absolute;
  left: 18px;
  bottom: 30px;
  width: 170px;
  padding: 14px;
  border-radius: 20px;
  background: rgba(255,255,255,.86);
  border: 1px solid rgba(70,139,223,.16);
  box-shadow: 0 16px 30px rgba(34,93,168,.12);
  z-index: 2;
}

.visual-card strong {
  display: block;
  font-size: 21px;
  color: var(--primary-dark);
}

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

section {
  margin-top: 20px;
}

.section {
  padding: 22px 18px;
  border-radius: var(--radius);
  background: rgba(255,255,255,.78);
  border: 1px solid rgba(70,139,223,.10);
  box-shadow: 0 10px 24px rgba(35,93,168,.06);
}

.section p {
  margin: 0 0 12px;
  color: #52667c;
}

.section p:last-child {
  margin-bottom: 0;
}

.card,
.faq-item,
.step-item {
  background: var(--card);
  border: 1px solid rgba(70,139,223,.12);
  border-radius: 20px;
  padding: 16px;
  box-shadow: 0 10px 24px rgba(35,93,168,.06);
}

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

.feature-grid {
  display: grid;
  gap: 12px;
}

.feature-card {
  background: linear-gradient(180deg, #fff, #f4faff);
  border: 1px solid rgba(70,139,223,.12);
  border-radius: 20px;
  padding: 16px;
}

.feature-card small,
.card small {
  display: inline-block;
  color: var(--primary-dark);
  background: rgba(70,139,223,.10);
  padding: 4px 8px;
  border-radius: 999px;
  font-weight: 700;
  margin-bottom: 8px;
}

.data-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.data-block {
  padding: 14px 8px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid rgba(70,139,223,.12);
  text-align: center;
}

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

.data-block span {
  color: var(--muted);
  font-size: 12px;
}

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

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

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

.step-item {
  position: relative;
  padding-left: 58px;
}

.step-item::before {
  counter-increment: steps;
  content: counter(steps);
  position: absolute;
  left: 16px;
  top: 18px;
  width: 28px;
  height: 28px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: rgb(70,139,223);
  color: #fff;
  font-weight: 800;
}

.notice {
  border-radius: 20px;
  padding: 16px;
  background: linear-gradient(145deg, rgba(70,139,223,.10), rgba(255,255,255,.92));
  border: 1px solid rgba(70,139,223,.16);
  color: #37536d;
}

.article-actions {
  margin-top: 18px;
  text-align: left;
}

.site-footer {
  max-width: 520px;
  margin: 0 auto;
  padding: 0 14px 28px;
}

.footer-card {
  border-radius: 24px;
  padding: 18px;
  background: #102743;
  color: rgba(255,255,255,.86);
  box-shadow: 0 18px 38px rgba(16,39,67,.12);
}

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

.footer-logo {
  width: 38px;
  height: 38px;
  border-radius: 14px;
}

.footer-brand p,
.fine-print {
  margin: 4px 0 0;
  color: rgba(255,255,255,.62);
  font-size: 13px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin: 16px 0;
}

.footer-links a {
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255,255,255,.08);
  font-size: 13px;
}

.pc-gate {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(247, 251, 255, .92);
  backdrop-filter: blur(12px);
}

.pc-gate-card {
  width: min(430px, 92vw);
  text-align: center;
  padding: 34px 28px;
  border-radius: 28px;
  background: #fff;
  border: 1px solid rgba(70,139,223,.16);
  box-shadow: var(--shadow);
}

.pc-gate-logo {
  width: 58px;
  height: 58px;
  margin: 0 auto 16px;
  border-radius: 18px;
}

.pc-gate-card h1 {
  font-size: 26px;
}

.pc-gate-card p {
  color: var(--muted);
}

.desktop-visitor .site-header,
.desktop-visitor main,
.desktop-visitor .site-footer {
  opacity: .18;
  pointer-events: none;
  user-select: none;
}

.desktop-visitor .download-btn {
  display: none;
}

@media (min-width: 760px) {
  body {
    background:
      radial-gradient(circle at 18% 0%, rgba(70,139,223,.16), transparent 24%),
      linear-gradient(180deg, #f6fbff 0%, #ffffff 52%, #f8fbff 100%);
  }

  main,
  .site-footer,
  .header-inner {
    max-width: 560px;
  }
}