* {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-dark: #236fb8;
  --primary-soft: #eaf4ff;
  --primary-soft-2: #f5f9ff;
  --text: #132238;
  --muted: #5e6f86;
  --line: #dce9f8;
  --card: rgba(255,255,255,.92);
  --shadow: 0 18px 45px rgba(42, 93, 151, .10);
  --radius: 22px;
  --radius-lg: 30px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(70,139,223,.14), transparent 28rem),
    linear-gradient(180deg, #f7fbff 0%, #ffffff 38%, #f7fbff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: rgba(255,255,255,.82);
  border-bottom: 1px solid rgba(215,229,246,.82);
}

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

.nav-container {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.logo,
.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -.02em;
  color: #10233d;
}

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

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

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: #25405f;
  border-radius: 2px;
}

.site-nav {
  display: none;
  position: absolute;
  top: 72px;
  left: 16px;
  right: 16px;
  padding: 12px;
  background: rgba(255,255,255,.98);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

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

.site-nav a {
  padding: 12px 14px;
  border-radius: 12px;
  color: #39516d;
  font-size: 15px;
}

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

.section {
  padding: 58px 0;
}

.gradient-bg {
  background:
    linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.8)),
    radial-gradient(circle at 80% 10%, rgba(70,139,223,.16), transparent 22rem);
}

.eyebrow,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(70,139,223,.22);
  background: rgba(70,139,223,.08);
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 700;
}

.hero-layout {
  padding: 56px 0 42px;
}

.hero-grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

.hero-copy h1,
.page-hero h1 {
  font-size: clamp(34px, 8vw, 66px);
  line-height: 1.08;
  letter-spacing: -.055em;
  margin: 18px 0 18px;
}

.hero-copy p,
.page-hero p,
.lead {
  color: var(--muted);
  font-size: 17px;
  margin: 0 0 22px;
}

.hero-tags,
.product-tags,
.meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
}

.hero-tags span,
.product-tags span,
.meta-tags span,
.check-pill {
  padding: 8px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: #39516d;
  font-size: 13px;
  box-shadow: 0 8px 24px rgba(60,102,150,.06);
}

.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: .02em;
  box-shadow: 0 14px 26px rgba(70,139,223,.28);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

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

.hero-device {
  position: relative;
  min-height: 520px;
  border-radius: var(--radius-lg);
  padding: 24px;
  background:
    linear-gradient(145deg, rgba(255,255,255,.9), rgba(234,244,255,.76)),
    radial-gradient(circle at 50% 30%, rgba(70,139,223,.18), transparent 18rem);
  border: 1px solid rgba(199,222,247,.9);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.app-visual {
  width: min(270px, 72%);
  margin: 36px auto 0;
  filter: drop-shadow(0 28px 42px rgba(36, 83, 137, .18));
}

.status-card {
  background: rgba(255,255,255,.92);
  border: 1px solid rgba(217,232,248,.95);
  border-radius: 18px;
  padding: 14px;
  box-shadow: 0 14px 34px rgba(56,96,145,.10);
  color: #29405d;
}

.status-card strong {
  display: block;
  font-size: 14px;
}

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

.status-card.floating {
  position: absolute;
  width: 178px;
}

.float-a { top: 28px; left: 22px; }
.float-b { top: 94px; right: 18px; }
.float-c { bottom: 84px; left: 16px; }
.float-d { bottom: 28px; right: 22px; }

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

.section-title.center {
  text-align: center;
  margin-inline: auto;
}

.section-title h2 {
  margin: 8px 0 10px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: -.035em;
}

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

.security-strip {
  display: grid;
  gap: 14px;
}

.metric-card,
.category-card,
.feature-card,
.security-card,
.scenario-card,
.faq-item,
.doc-card,
.step-card,
.process-step {
  background: var(--card);
  border: 1px solid rgba(216,230,247,.95);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 12px 34px rgba(50, 90, 137, .06);
}

.metric-card strong {
  display: block;
  color: var(--primary-dark);
  font-size: 23px;
  margin-bottom: 4px;
}

.metric-card span,
.category-card p,
.feature-card p,
.security-card p,
.scenario-card p,
.faq-item p,
.doc-card p,
.step-card p,
.process-step p {
  color: var(--muted);
  margin: 6px 0 0;
}

.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
}

.category-nav a {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: #32516f;
  padding: 8px 12px;
  font-size: 14px;
}

.category-grid,
.feature-grid,
.scenario-grid,
.doc-grid {
  display: grid;
  gap: 16px;
}

.category-card,
.scenario-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.category-card h3,
.feature-card h3,
.scenario-card h3,
.doc-card h3,
.step-card h3 {
  margin: 0 0 8px;
  font-size: 19px;
}

.card-link {
  display: inline-flex;
  margin-top: 16px;
  color: var(--primary-dark);
  font-weight: 800;
  font-size: 14px;
}

.steps,
.roadmap {
  display: grid;
  gap: 14px;
  counter-reset: step;
}

.step-card,
.process-step {
  position: relative;
  padding-left: 68px;
}

.step-num {
  position: absolute;
  left: 20px;
  top: 22px;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
}

.feature-card.large {
  background:
    linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.96));
}

.feature-card.small {
  padding: 18px;
}

.security-layout {
  display: grid;
  gap: 18px;
  align-items: start;
}

.security-panel {
  background: #10233d;
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 22px 46px rgba(16,35,61,.16);
}

.security-panel p {
  color: rgba(255,255,255,.72);
}

.security-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.security-list div {
  padding: 14px;
  border-radius: 16px;
  background: rgba(255,255,255,.09);
  border: 1px solid rgba(255,255,255,.13);
}

.flow-line {
  display: grid;
  gap: 12px;
}

.flow-line .process-step {
  background: linear-gradient(180deg, #fff, #f7fbff);
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item h3,
.faq-item summary {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  cursor: pointer;
}

.faq-item details p {
  margin-top: 12px;
}

.cta-section {
  text-align: center;
  border-radius: var(--radius-lg);
  padding: 40px 22px;
  background:
    linear-gradient(135deg, rgba(70,139,223,.13), rgba(255,255,255,.95)),
    radial-gradient(circle at 70% 20%, rgba(70,139,223,.18), transparent 16rem);
  border: 1px solid rgba(207,225,246,.95);
  box-shadow: var(--shadow);
}

.cta-section h2 {
  margin: 0 0 10px;
  font-size: clamp(27px, 4vw, 42px);
}

.cta-section p {
  color: var(--muted);
  margin: 0 auto 22px;
  max-width: 700px;
}

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

.page-hero.narrow {
  max-width: 820px;
  margin: 0 auto;
}

.content-layout {
  display: grid;
  gap: 18px;
  align-items: start;
}

.article {
  background: rgba(255,255,255,.9);
  border: 1px solid rgba(216,230,247,.95);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}

.article h2 {
  margin-top: 26px;
  margin-bottom: 8px;
  font-size: 24px;
}

.article p {
  color: #4e6178;
}

.article ul,
.article ol {
  color: #4e6178;
  padding-left: 22px;
}

.aside-stack {
  display: grid;
  gap: 14px;
}

.notice-card {
  border-radius: var(--radius);
  border: 1px solid rgba(70,139,223,.22);
  background: linear-gradient(180deg, rgba(234,244,255,.9), #fff);
  padding: 20px;
}

.notice-card h3 {
  margin-top: 0;
}

.notice-card p,
.notice-card li {
  color: var(--muted);
}

.download-page-card {
  max-width: 850px;
  margin: 0 auto;
  text-align: center;
  background: rgba(255,255,255,.94);
  border: 1px solid rgba(216,230,247,.95);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 30px;
}

.install-steps {
  display: grid;
  gap: 12px;
  margin: 28px 0;
  text-align: left;
}

.install-steps div {
  padding: 16px;
  border-radius: 18px;
  background: var(--primary-soft-2);
  border: 1px solid var(--line);
}

.site-footer {
  margin-top: 60px;
  padding: 44px 0 20px;
  background: #f2f7fe;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  gap: 24px;
}

.site-footer p,
.site-footer a {
  color: #5f7187;
}

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

.site-footer h3 {
  margin: 0 0 12px;
  font-size: 16px;
}

.footer-bottom {
  width: min(1120px, calc(100% - 32px));
  margin: 28px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: #748399;
  font-size: 13px;
}

@media (min-width: 640px) {
  .security-strip,
  .category-grid,
  .feature-grid,
  .scenario-grid,
  .doc-grid,
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .article {
    padding: 34px;
  }
}

@media (min-width: 920px) {
  .nav-toggle {
    display: none;
  }

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

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

  .hero-layout {
    padding: 86px 0 56px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(380px, .9fr);
    gap: 42px;
  }

  .security-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .category-card.wide {
    grid-column: span 2;
  }

  .feature-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .feature-card {
    grid-column: span 2;
  }

  .feature-card.large {
    grid-column: span 3;
    min-height: 230px;
  }

  .feature-card.medium {
    grid-column: span 3;
  }

  .feature-card.small {
    grid-column: span 2;
  }

  .security-layout {
    grid-template-columns: .95fr 1.05fr;
    gap: 36px;
  }

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

  .roadmap {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .roadmap .step-card {
    padding-left: 22px;
    padding-top: 70px;
  }

  .roadmap .step-num {
    top: 22px;
  }

  .scenario-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .scenario-card {
    grid-column: span 1;
  }

  .content-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 24px;
  }

  .footer-grid {
    grid-template-columns: 1.4fr repeat(3, 1fr);
  }
}

@media (min-width: 1180px) {
  .hero-device {
    min-height: 560px;
  }

  .float-a { top: 34px; left: 32px; }
  .float-b { top: 120px; right: 28px; }
  .float-c { bottom: 120px; left: 28px; }
  .float-d { bottom: 38px; right: 36px; }
}