:root {
  color-scheme: light dark;
  --background: #f4f6f8;
  --surface: #ffffff;
  --text: #15202b;
  --muted: #536273;
  --accent: #075eab;
  --border: #d6dde5;
  --focus: #f4a000;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 2px;
}

.site-header {
  background: #0b1726;
  color: #ffffff;
}

.header-inner,
main,
.footer-inner {
  width: min(100% - 2rem, 760px);
  margin-inline: auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1rem;
}

.brand {
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 750;
  text-decoration: none;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: .9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

nav a { color: #ffffff; }

main { padding-block: clamp(2rem, 6vw, 4.5rem); }

.card {
  padding: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  box-shadow: 0 10px 30px rgb(22 36 50 / 8%);
}

h1, h2, h3 { line-height: 1.2; }
h1 { margin-top: 0; font-size: clamp(2rem, 7vw, 3.25rem); }
h2 { margin-top: 2.1rem; font-size: 1.4rem; }
h3 { margin-top: 1.5rem; font-size: 1.08rem; }
.lede { color: var(--muted); font-size: 1.15rem; }
.eyebrow {
  color: var(--accent);
  font-size: .82rem;
  font-weight: 750;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.feature-list { padding-left: 1.25rem; }
.feature-list li { margin-block: .6rem; }
.note {
  padding: 1rem;
  border-left: 4px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
}
.button-link {
  display: inline-block;
  padding: .68rem 1rem;
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
  background: var(--accent);
  border-radius: .7rem;
}
.button-link:hover { text-decoration: underline; }
.site-footer { padding-block: 1.5rem 2.5rem; color: var(--muted); }
.site-footer p { margin: 0; }

@media (max-width: 560px) {
  .header-inner { align-items: flex-start; flex-direction: column; }
  nav ul { gap: .5rem 1rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #08111c;
    --surface: #111d2b;
    --text: #f4f7fa;
    --muted: #b8c5d2;
    --accent: #6eb8ff;
    --border: #2a3a4c;
  }
  .site-header { background: #050b12; }
  .button-link { color: #07111d; }
}