:root {
  --primary: rgb(70,139,223);
  --primary-dark: #2e6fb9;
  --primary-soft: #eaf3ff;
  --ink: #14233b;
  --muted: #60708a;
  --line: #dbe7f5;
  --card: #ffffff;
  --bg: #f7fbff;
  --shadow: 0 16px 40px rgba(26, 67, 119, .10);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

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(--ink);
  background: linear-gradient(180deg, #f5faff 0%, #ffffff 42%, #f7fbff 100%);
  line-height: 1.7;
  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: 30;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219, 231, 245, .85);
}

.nav-wrap {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

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

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(70,139,223,.22);
}

.brand-text {
  white-space: nowrap;
}

.nav-toggle {
  display: none;
}

.nav-trigger {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: #fff;
}

.nav-trigger span {
  width: 20px;
  height: 2px;
  border-radius: 10px;
  background: var(--ink);
}

.main-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 76px;
  display: none;
  padding: 14px;
  border-radius: 20px;
  background: #fff;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.main-nav a {
  display: block;
  padding: 12px 14px;
  border-radius: 14px;
  color: var(--muted);
  font-size: 15px;
}

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

.nav-toggle:checked ~ .main-nav {
  display: block;
}

.hero {
  padding: 58px 0 34px;
}

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

.eyebrow,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 13px;
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: -.03em;
  margin: 0 0 14px;
}

h1 {
  font-size: clamp(34px, 8vw, 58px);
}

h2 {
  font-size: clamp(26px, 5vw, 38px);
}

h3 {
  font-size: 20px;
}

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

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  letter-spacing: .01em;
  box-shadow: 0 14px 28px rgba(70,139,223,.28);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
  border: 0;
  cursor: pointer;
}

.download-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(70,139,223,.32);
}

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

.trust-tags span {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.76);
  color: var(--muted);
  font-size: 14px;
}

.hero-device {
  position: relative;
  border-radius: 34px;
  padding: 22px;
  background: linear-gradient(145deg, rgba(70,139,223,.18), rgba(255,255,255,.86));
  box-shadow: var(--shadow);
  border: 1px solid rgba(219,231,245,.8);
}

.hero-device:before {
  content: "";
  position: absolute;
  inset: 12% -6% auto auto;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: rgba(70,139,223,.12);
  filter: blur(6px);
}

.app-shot {
  width: min(100%, 420px);
  margin: 0 auto;
  position: relative;
  z-index: 1;
  border-radius: 28px;
}

.stats-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 18px;
}

.stat {
  padding: 16px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--line);
}

.stat strong {
  display: block;
  font-size: 22px;
  color: var(--primary-dark);
}

.section {
  padding: 42px 0;
}

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

.section-head p,
.card p,
.content-card p,
.article-body p,
.faq-item p,
.notice p {
  color: var(--muted);
  margin: 0;
}

.grid,
.feature-grid,
.two-col,
.steps-grid,
.article-grid,
.faq-grid {
  display: grid;
  gap: 18px;
}

.card,
.content-card,
.faq-item,
.notice,
.step-card,
.article-body,
.info-panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 10px 28px rgba(26,67,119,.06);
}

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-weight: 900;
  margin-bottom: 14px;
}

.soft-section {
  background: linear-gradient(135deg, rgba(70,139,223,.08), rgba(255,255,255,.85));
  border-block: 1px solid rgba(219,231,245,.75);
}

.check-list,
.clean-list {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  gap: 10px;
}

.check-list li,
.clean-list li {
  position: relative;
  padding-left: 28px;
  color: var(--muted);
}

.check-list li:before,
.clean-list li:before {
  content: "";
  position: absolute;
  left: 0;
  top: .65em;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 5px rgba(70,139,223,.12);
}

.page-hero {
  padding: 54px 0 26px;
}

.page-hero .lead {
  max-width: 780px;
}

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

.article-body h2,
.article-body h3 {
  margin-top: 6px;
}

.cta-card {
  display: grid;
  gap: 16px;
  align-items: center;
  padding: 24px;
  border-radius: 26px;
  background: linear-gradient(135deg, rgba(70,139,223,.14), rgba(255,255,255,.96));
  border: 1px solid var(--line);
}

.faq-item h2,
.faq-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.download-panel {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  padding: 30px;
  border-radius: 28px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.steps {
  counter-reset: step;
}

.step-card {
  counter-increment: step;
}

.step-card:before {
  content: counter(step);
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  margin-bottom: 12px;
}

.site-footer {
  margin-top: 40px;
  background: #10213a;
  color: #d9e7fb;
  padding: 42px 0 22px;
}

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

.footer-grid p {
  color: #aebfda;
  max-width: 520px;
}

.footer-brand {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

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

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

.site-footer a {
  display: block;
  color: #aebfda;
  margin: 8px 0;
}

.site-footer a:hover {
  color: #fff;
}

.footer-bottom {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.12);
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: #8fa3c2;
  font-size: 14px;
}

@media (min-width: 700px) {
  .stats-strip {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .cta-card {
    grid-template-columns: 1fr auto;
  }
}

@media (min-width: 960px) {
  .nav-trigger {
    display: none;
  }

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

  .main-nav a {
    padding: 9px 12px;
  }

  .hero {
    padding: 78px 0 52px;
  }

  .hero-grid,
  .two-col,
  .article-grid {
    grid-template-columns: 1.08fr .92fr;
  }

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

  .footer-grid {
    grid-template-columns: 1.4fr .8fr .8fr;
  }

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

  .section {
    padding: 58px 0;
  }
}

@media (min-width: 1160px) {
  .hero-device {
    transform: translateX(12px);
  }
}