:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --ink: #102033;
  --muted: #5f7084;
  --line: #d8e0ea;
  --panel: #ffffff;
  --navy: #123a5c;
  --teal: #0f9f8f;
  --blue: #1d6fd8;
  --gold: #c89432;
  --shadow: 0 18px 50px rgba(15, 32, 52, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(18, 58, 92, 0.08), rgba(245, 247, 251, 0) 520px),
    var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 0 6vw;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(216, 224, 234, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: var(--navy);
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 650;
}

.nav a:hover {
  color: var(--navy);
}

.nav-download {
  padding: 10px 14px;
  border: 1px solid rgba(29, 111, 216, 0.25);
  border-radius: 8px;
  color: var(--blue);
  background: rgba(29, 111, 216, 0.08);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: 52px;
  min-height: calc(100vh - 72px);
  padding: 64px 6vw 76px;
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(2.7rem, 5.4vw, 4.85rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.lead {
  max-width: 690px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.68;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 800;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 14px 30px rgba(29, 111, 216, 0.24);
}

.secondary {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--navy);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.trust-row span,
.scenario-list span {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.security-panel {
  position: relative;
  overflow: hidden;
  min-height: 520px;
  padding: 28px;
  border: 1px solid rgba(216, 224, 234, 0.9);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(18, 58, 92, 0.96), rgba(15, 159, 143, 0.78)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.07) 0 1px, transparent 1px 62px);
  box-shadow: var(--shadow);
  color: #fff;
}

.security-panel::after {
  content: "";
  position: absolute;
  inset: 76px 24px 24px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: 0.75;
}

.panel-head,
.route-map,
.signal-grid {
  position: relative;
  z-index: 1;
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.86);
  font-weight: 800;
}

.status-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #58d68d;
  box-shadow: 0 0 0 7px rgba(88, 214, 141, 0.2);
}

.route-map {
  display: grid;
  grid-template-columns: 1fr 0.45fr 1fr 0.45fr 1fr;
  align-items: center;
  gap: 12px;
  margin: 132px 0 96px;
}

.node {
  display: grid;
  place-items: center;
  min-height: 104px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.14);
  font-weight: 900;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.route-line {
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.25), #7cf6d4);
}

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

.signal-grid div,
.metrics div {
  padding: 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.signal-grid strong,
.metrics strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.45rem;
}

.signal-grid span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.86rem;
  line-height: 1.35;
}

.section {
  padding: 78px 6vw;
}

.section-title {
  max-width: 760px;
  margin-bottom: 30px;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.04;
  letter-spacing: 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.feature {
  min-height: 240px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(16, 32, 51, 0.06);
}

.feature-icon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 28px;
  border-radius: 8px;
  background: rgba(15, 159, 143, 0.11);
  color: var(--teal);
  font-weight: 900;
}

.feature h3 {
  margin-bottom: 12px;
  font-size: 1.16rem;
}

.feature p,
.security-copy p {
  color: var(--muted);
  line-height: 1.65;
}

.security-section {
  background: #102033;
  color: #fff;
}

.security-section .section-title h2 {
  max-width: 820px;
}

.security-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.72fr);
  gap: 48px;
  align-items: start;
}

.security-copy p {
  color: rgba(255, 255, 255, 0.76);
  font-size: 1.05rem;
}

.check-list {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 15px 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.metrics {
  display: grid;
  gap: 14px;
}

.metric-label {
  display: block;
  margin-bottom: 8px;
  color: rgba(255, 255, 255, 0.64);
  font-size: 0.88rem;
  font-weight: 700;
}

.scenario-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.download-band {
  justify-content: space-between;
  margin: 0 6vw 70px;
  padding: 34px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.download-band h2 {
  max-width: 760px;
  font-size: clamp(1.75rem, 3vw, 2.65rem);
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 28px 6vw;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 980px) {
  .hero,
  .security-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

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

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 5vw;
  }

  .nav {
    width: 100%;
    flex-wrap: wrap;
    gap: 10px;
    padding-bottom: 4px;
  }

  .nav a {
    min-width: 0;
  }

  .hero,
  .section {
    padding-left: 5vw;
    padding-right: 5vw;
  }

  h1 {
    font-size: 2.72rem;
  }

  .security-panel {
    min-height: auto;
    padding: 20px;
  }

  .route-map,
  .signal-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .route-map {
    margin: 48px 0 28px;
  }

  .route-line {
    min-height: 42px;
    width: 3px;
    justify-self: center;
  }

  .download-band {
    margin: 0 5vw 52px;
    padding: 24px;
  }
}