:root {
  --bg: #081120;
  --bg-soft: #101c34;
  --panel: rgba(14, 26, 49, 0.82);
  --panel-strong: #122444;
  --line: rgba(148, 179, 255, 0.18);
  --text: #ecf4ff;
  --muted: #a9b8d0;
  --brand: #5ed6ff;
  --brand-strong: #3aa8ff;
  --brand-soft: rgba(94, 214, 255, 0.16);
  --success: #4ae2a3;
  --warning: #ffd166;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(94, 214, 255, 0.18), transparent 30%),
    radial-gradient(circle at left center, rgba(58, 168, 255, 0.15), transparent 26%),
    linear-gradient(180deg, #081120 0%, #091425 48%, #0a1630 100%);
  min-height: 100vh;
  line-height: 1.65;
}

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

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

button {
  font: inherit;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(18px);
  background: rgba(7, 16, 32, 0.72);
  border-bottom: 1px solid rgba(148, 179, 255, 0.12);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 74px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: transparent;
  box-shadow: 0 10px 24px rgba(58, 108, 255, 0.24);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav-link {
  padding: 10px 16px;
  border-radius: 999px;
  color: var(--muted);
  border: 1px solid transparent;
  transition: 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text);
  border-color: rgba(148, 179, 255, 0.18);
  background: rgba(255, 255, 255, 0.03);
}

.nav-link.active {
  color: #071120;
  background: linear-gradient(135deg, var(--brand), #8ce2ff);
  border-color: transparent;
  font-weight: 700;
}

main {
  padding-bottom: 48px;
}

.hero {
  padding: 72px 0 34px;
}

.hero-grid,
.two-col,
.download-layout,
.compare-grid,
.article-grid,
.review-grid,
.faq-grid,
.platform-grid,
.stats-grid,
.feature-grid,
.card-grid,
.steps-grid,
.tip-grid,
.update-grid {
  display: grid;
  gap: 24px;
}

.hero-grid,
.two-col,
.download-layout,
.article-grid {
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(94, 214, 255, 0.09);
  border: 1px solid rgba(94, 214, 255, 0.18);
  color: #b9ecff;
  font-size: 0.92rem;
}

.hero h1,
.section-title {
  margin: 18px 0 14px;
  line-height: 1.12;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 4.25rem);
  max-width: 10ch;
}

.lead,
.section-intro {
  color: var(--muted);
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.btn,
.download-btn,
.store-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: 0.2s ease;
}

.btn-primary,
.download-btn.primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #071120;
  font-weight: 700;
  box-shadow: 0 18px 40px rgba(58, 168, 255, 0.28);
}

.btn-secondary,
.download-btn.secondary,
.store-btn {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  border-color: rgba(148, 179, 255, 0.16);
}

.btn:hover,
.download-btn:hover,
.store-btn:hover {
  transform: translateY(-1px);
}

.panel,
.card,
.metric,
.faq-item,
.quote,
.platform-card,
.info-card,
.compare-card,
.timeline-card,
.step-card,
.tip-card,
.update-card,
.article-card,
.download-focus,
.sidebar-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.panel,
.download-focus,
.sidebar-card,
.article-card {
  padding: 28px;
}

.metric,
.card,
.faq-item,
.quote,
.platform-card,
.info-card,
.compare-card,
.timeline-card,
.step-card,
.tip-card,
.update-card {
  padding: 22px;
}

.hero-visual {
  position: relative;
  min-height: 420px;
}

.orbit,
.shield-core,
.float-card {
  position: absolute;
}

.orbit {
  inset: 28px;
  border-radius: 40px;
  border: 1px solid rgba(94, 214, 255, 0.16);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(6, 14, 27, 0.1));
}

.shield-core {
  inset: 76px 88px;
  border-radius: 36px;
  background: linear-gradient(180deg, rgba(94, 214, 255, 0.26), rgba(58, 168, 255, 0.08));
  display: grid;
  place-items: center;
}

.float-card {
  padding: 16px 18px;
  min-width: 150px;
  border-radius: 18px;
  background: rgba(12, 23, 43, 0.92);
  border: 1px solid rgba(148, 179, 255, 0.18);
  box-shadow: var(--shadow);
}

.float-card.top {
  top: 18px;
  right: 8px;
}

.float-card.bottom {
  left: 12px;
  bottom: 28px;
}

.kpi {
  font-size: 1.7rem;
  font-weight: 700;
  margin-bottom: 6px;
}

section {
  padding: 28px 0;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
}

.stats-grid,
.feature-grid,
.review-grid,
.platform-grid,
.faq-grid,
.card-grid,
.steps-grid,
.tip-grid,
.update-grid,
.compare-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.metric strong,
.card h3,
.quote h3,
.platform-card h3,
.info-card h3,
.compare-card h3,
.timeline-card h3,
.step-card h3,
.tip-card h3,
.update-card h3,
.article-card h2,
.download-focus h2,
.sidebar-card h3,
.faq-item h3 {
  display: block;
  margin-bottom: 10px;
}

.small {
  font-size: 0.95rem;
  color: var(--muted);
}

.highlight {
  color: #b7ecff;
}

.check-list,
.clean-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.check-list li,
.clean-list li {
  display: flex;
  gap: 12px;
  margin-top: 12px;
  color: var(--muted);
}

.icon-wrap {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: inline-grid;
  place-items: center;
  background: rgba(94, 214, 255, 0.1);
  color: #9ce9ff;
  flex: 0 0 auto;
}

.quote strong {
  color: var(--warning);
}

.muted-box {
  padding: 16px 18px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(148, 179, 255, 0.12);
}

.cta-banner {
  margin-top: 16px;
  padding: 24px;
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(94, 214, 255, 0.18), rgba(58, 168, 255, 0.08));
  border: 1px solid rgba(94, 214, 255, 0.24);
}

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  padding: 14px 20px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #06111d;
  font-weight: 700;
}

.site-footer {
  padding: 18px 0 40px;
}

.footer-card {
  padding: 22px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(148, 179, 255, 0.14);
  color: var(--muted);
}

.footer-card p {
  margin: 0;
}

.footer-card p + p {
  margin-top: 8px;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 980px) {
  .hero-grid,
  .two-col,
  .download-layout,
  .article-grid,
  .stats-grid,
  .feature-grid,
  .review-grid,
  .platform-grid,
  .faq-grid,
  .card-grid,
  .steps-grid,
  .tip-grid,
  .update-grid,
  .compare-grid,
  .platform-grid.four {
    grid-template-columns: 1fr;
  }

  .navbar,
  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero h1 {
    max-width: none;
  }

  .hero-visual {
    min-height: 340px;
  }

  .shield-core {
    inset: 66px 54px;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 24px), var(--max));
  }

  .hero {
    padding-top: 44px;
  }

  .panel,
  .download-focus,
  .sidebar-card,
  .article-card,
  .metric,
  .card,
  .faq-item,
  .quote,
  .platform-card,
  .info-card,
  .compare-card,
  .timeline-card,
  .step-card,
  .tip-card,
  .update-card {
    padding: 18px;
  }

  .btn,
  .download-btn,
  .store-btn,
  .link-btn {
    width: 100%;
  }
}