:root {
  color-scheme: light;
  --bg: #f4f9fd;
  --fg: #0c1b2a;
  --muted: #4a657a;
  --line: #c9dce9;
  --sky: #38bdf8;
  --cyan: #0ea5e9;
  --accent: #0284c7;
  --navy: #0b4f8a;
  --card: #ffffff;
  font-family: "Segoe UI", "IBM Plex Sans", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(ellipse 90% 50% at 50% -5%, rgba(56, 189, 248, 0.22), transparent 55%),
    var(--bg);
  color: var(--fg);
  line-height: 1.55;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--navy);
  text-decoration: underline;
}

.site-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand strong {
  color: var(--navy);
}

.brand span,
.muted,
.eyebrow {
  color: var(--muted);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--cyan);
}

nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.cta {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--cyan), var(--navy));
  color: #fff !important;
  text-decoration: none !important;
  box-shadow: 0 6px 16px rgba(2, 132, 199, 0.25);
}

.cta:hover {
  filter: brightness(1.05);
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 8px 0 12px;
  letter-spacing: -0.03em;
  color: var(--navy);
}

.lead {
  font-size: 1.125rem;
  color: var(--muted);
}

section + section {
  margin-top: 36px;
}

.doc h2 {
  margin-top: 28px;
  color: var(--navy);
}

footer {
  border-top: 1px solid var(--line);
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.925rem;
  background: var(--card);
}

@media (max-width: 720px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }
}