* {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-dark: #1f5fae;
  --primary-soft: #eaf4ff;
  --primary-pale: #f5f9ff;
  --text: #13233a;
  --muted: #63758d;
  --line: #dbe8f7;
  --card: #ffffff;
  --bg: #f8fbff;
  --shadow: 0 14px 42px rgba(36, 91, 154, 0.10);
  --radius: 22px;
}

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 18% 0%, rgba(70,139,223,0.14), transparent 31rem),
    linear-gradient(180deg, #f7fbff 0%, #ffffff 42%, #f8fbff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}

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

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

p {
  margin: 0 0 14px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.90);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(219,232,247,0.9);
}

.header-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #17365f;
}

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

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  cursor: pointer;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--text);
  margin: 0 auto;
  border-radius: 999px;
}

.site-nav {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 74px;
  display: none;
  padding: 12px;
  background: rgba(255,255,255,0.98);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.site-nav.open {
  display: grid;
  gap: 4px;
}

.site-nav a {
  padding: 12px 14px;
  border-radius: 12px;
  color: #39506d;
  font-size: 15px;
}

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

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

.section {
  padding: 58px 0;
}

.section-tight {
  padding: 38px 0;
}

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

.section-eyebrow,
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 14px;
}

.section-title {
  margin: 0 0 12px;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.04em;
  color: #102643;
}

.section-desc {
  color: var(--muted);
  font-size: 16px;
}

.hero {
  padding: 46px 0 54px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: center;
}

.hero-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(34px, 9vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.05em;
  color: #0f2745;
}

.hero-copy p {
  color: #536a84;
  font-size: 17px;
}

.hero-tags,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 24px;
}

.tag,
.status-chip {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.8);
  border: 1px solid var(--line);
  color: #385a82;
  font-size: 13px;
  font-weight: 650;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  font-size: 16px;
  box-shadow: 0 12px 28px rgba(70,139,223,0.26);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.download-btn:hover {
  transform: translateY(-2px);
  background: var(--primary-dark);
  box-shadow: 0 18px 36px rgba(70,139,223,0.32);
}

.hero-visual {
  position: relative;
  min-height: 430px;
  padding: 20px;
  border-radius: 34px;
  background:
    linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.92)),
    radial-gradient(circle at 80% 10%, rgba(70,139,223,0.22), transparent 16rem);
  border: 1px solid rgba(219,232,247,0.92);
  overflow: hidden;
}

.phone-card {
  width: min(255px, 78%);
  margin: 0 auto;
  border-radius: 36px;
  padding: 12px;
  background: #ffffff;
  box-shadow: 0 22px 60px rgba(26, 74, 130, 0.16);
}

.phone-card img {
  border-radius: 28px;
}

.floating-card {
  position: absolute;
  padding: 14px 16px;
  background: rgba(255,255,255,0.92);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: 18px;
  max-width: 210px;
}

.floating-card strong {
  display: block;
  font-size: 15px;
  color: #183556;
}

.floating-card span {
  color: var(--muted);
  font-size: 13px;
}

.card-status {
  top: 28px;
  left: 18px;
}

.card-assets {
  right: 18px;
  top: 118px;
}

.card-risk {
  left: 18px;
  bottom: 26px;
}

.asset-line {
  display: flex;
  justify-content: space-between;
  gap: 22px;
  padding-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

.data-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 16px;
  background: rgba(255,255,255,0.82);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.data-item {
  padding: 14px;
  border-radius: 18px;
  background: linear-gradient(180deg, #fff, #f6fbff);
}

.data-item strong {
  display: block;
  color: #15385f;
  font-size: 18px;
}

.data-item span {
  color: var(--muted);
  font-size: 14px;
}

.category-grid,
.feature-grid,
.scenario-grid,
.article-grid,
.faq-grid,
.steps-grid,
.check-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.category-card,
.feature-card,
.scenario-card,
.faq-item,
.step-card,
.info-card,
.check-card {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.92);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(36, 91, 154, 0.06);
}

.category-card,
.feature-card,
.scenario-card,
.step-card,
.info-card,
.check-card {
  padding: 22px;
}

.category-card:hover,
.feature-card:hover,
.scenario-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.category-card,
.feature-card,
.scenario-card {
  transition: 0.2s ease;
}

.card-icon {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  font-weight: 900;
  margin-bottom: 12px;
}

.category-card h3,
.feature-card h3,
.scenario-card h3,
.step-card h3,
.info-card h3,
.check-card h3 {
  margin: 0 0 8px;
  color: #153355;
  font-size: 20px;
  line-height: 1.35;
}

.category-card p,
.feature-card p,
.scenario-card p,
.step-card p,
.info-card p,
.check-card p {
  color: var(--muted);
  font-size: 15px;
}

.card-link {
  display: inline-flex;
  margin-top: 10px;
  color: var(--primary-dark);
  font-weight: 800;
}

.security-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: center;
}

.security-panel {
  padding: 24px;
  border-radius: 28px;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(70,139,223,0.10), rgba(255,255,255,0.92)),
    #fff;
  box-shadow: var(--shadow);
}

.security-panel h3 {
  margin: 0 0 16px;
  font-size: 24px;
}

.security-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.security-row:last-child {
  border-bottom: 0;
}

.security-row span {
  color: var(--muted);
}

.security-row strong {
  color: #15385f;
  text-align: right;
}

.process-steps {
  counter-reset: step;
}

.step-card {
  position: relative;
  overflow: hidden;
}

.step-card::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  margin-bottom: 12px;
}

.faq-item {
  padding: 0;
  overflow: hidden;
}

.faq-item h3 {
  margin: 0;
  padding: 18px 20px 8px;
  font-size: 18px;
  color: #143355;
}

.faq-item p {
  padding: 0 20px 20px;
  color: var(--muted);
}

.cta-section {
  text-align: center;
  padding: 42px 22px;
  border-radius: 30px;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 20% 20%, rgba(70,139,223,0.15), transparent 18rem),
    linear-gradient(135deg, #f3f9ff, #ffffff);
  box-shadow: var(--shadow);
}

.cta-section h2 {
  margin: 0 0 12px;
  font-size: clamp(26px, 5vw, 42px);
  letter-spacing: -0.04em;
}

.cta-section p {
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto 22px;
}

.page-hero {
  padding: 50px 0 22px;
}

.page-hero-inner {
  padding: 30px;
  border-radius: 30px;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 10% 20%, rgba(70,139,223,0.16), transparent 18rem),
    linear-gradient(135deg, #ffffff, #f2f8ff);
  box-shadow: var(--shadow);
}

.page-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(30px, 7vw, 50px);
  line-height: 1.15;
  letter-spacing: -0.045em;
}

.page-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 16px;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.article-main {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255,255,255,0.94);
  box-shadow: 0 12px 34px rgba(36, 91, 154, 0.07);
}

.article-main h2 {
  margin: 10px 0 12px;
  color: #153355;
  font-size: 25px;
}

.article-main h3 {
  margin: 22px 0 10px;
  color: #153355;
}

.article-main p,
.article-main li {
  color: #556c86;
}

.article-main ul,
.article-main ol {
  padding-left: 20px;
}

.side-panel {
  padding: 22px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff, #f5faff);
  box-shadow: 0 10px 30px rgba(36, 91, 154, 0.06);
}

.side-panel h3 {
  margin-top: 0;
}

.notice {
  padding: 16px 18px;
  border-radius: 18px;
  background: var(--primary-soft);
  border: 1px solid #cfe4ff;
  color: #2f5e96;
}

.warning {
  padding: 16px 18px;
  border-radius: 18px;
  background: #fff8e8;
  border: 1px solid #f3dfaa;
  color: #7b5a12;
}

.source-list {
  display: grid;
  gap: 12px;
  margin: 18px 0;
}

.source-list div {
  padding: 14px 16px;
  border-radius: 16px;
  background: #f6fbff;
  border: 1px solid var(--line);
}

.download-panel {
  display: grid;
  gap: 18px;
  align-items: center;
  padding: 28px;
  border-radius: 30px;
  background:
    linear-gradient(135deg, rgba(70,139,223,0.12), rgba(255,255,255,0.94)),
    #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: 42px 0 28px;
}

.site-footer {
  margin-top: 40px;
  background: #f0f6ff;
  border-top: 1px solid var(--line);
}

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

.site-footer a {
  display: block;
  color: #516985;
  margin: 8px 0;
  font-size: 14px;
}

.site-footer a:hover {
  color: var(--primary-dark);
}

.footer-brand img {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  margin-bottom: 10px;
}

.footer-brand p {
  color: #61758d;
  font-size: 14px;
}

.footer-bottom {
  border-top: 1px solid var(--line);
  text-align: center;
  padding: 18px;
  color: #6b7d92;
  font-size: 13px;
}

@media (min-width: 640px) {
  .data-strip,
  .category-grid,
  .feature-grid,
  .scenario-grid,
  .faq-grid,
  .steps-grid,
  .check-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .download-panel {
    grid-template-columns: 1fr auto;
  }
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }

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

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

  .hero {
    padding: 72px 0 70px;
  }

  .hero-layout {
    grid-template-columns: 1.02fr 0.98fr;
    gap: 56px;
  }

  .hero-visual {
    min-height: 520px;
  }

  .phone-card {
    width: 292px;
    margin-top: 18px;
  }

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

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

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

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

  .security-layout {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 42px;
  }

  .article-layout {
    grid-template-columns: minmax(0, 1fr) 310px;
    align-items: start;
  }

  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
  }

  .section {
    padding: 74px 0;
  }
}

@media (min-width: 1100px) {
  .card-status {
    left: 34px;
  }

  .card-assets {
    right: 30px;
  }

  .card-risk {
    left: 46px;
  }
}