:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #031d24;
  color: #f7faf8;
  --night: #031d24;
  --night-soft: #0b3840;
  --sky: #bde8e6;
  --gold: #e8b860;
  --muted: #bfd0cf;
  --line: rgba(189, 232, 230, .18);
}

* { box-sizing: border-box; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: .75rem;
  left: .75rem;
  min-height: 44px;
  padding: .7rem 1rem;
  border-radius: .4rem;
  color: var(--night);
  background: #fff;
  font-weight: 800;
  transform: translateY(calc(-100% - 1.5rem));
  transition: transform .16s ease;
}

.skip-link:focus {
  color: var(--night);
  transform: translateY(0);
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background:
    radial-gradient(circle at 82% 6%, rgba(77, 183, 184, .16), transparent 26rem),
    radial-gradient(circle at 15% 46%, rgba(232, 184, 96, .07), transparent 24rem),
    var(--night);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .28;
  background-image: radial-gradient(circle, rgba(189, 232, 230, .55) 0 1px, transparent 1.5px);
  background-size: 76px 76px;
  mask-image: linear-gradient(135deg, black, transparent 58%);
}

main {
  position: relative;
  width: min(48rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2rem, 7vw, 5rem) 0 4rem;
}

header { display: flex; align-items: center; gap: .8rem; color: #9fb7b7; }
header b { display: block; color: #fff; font-size: 1rem; letter-spacing: -.02em; }
header span span { color: var(--sky); font-size: .72rem; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.mark { display: block; width: 3rem; height: 3rem; object-fit: contain; flex: none; filter: brightness(0) invert(1); }

h1 {
  max-width: 44rem;
  margin: clamp(3.2rem, 9vw, 6.6rem) 0 1.25rem;
  color: #fff;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(2.8rem, 8vw, 5.3rem);
  font-weight: 400;
  line-height: .96;
  letter-spacing: -.055em;
}

h2 { margin: 3.2rem 0 .8rem; color: var(--sky); font: 400 1.35rem/1.2 Georgia, 'Times New Roman', serif; }
p, li { color: var(--muted); line-height: 1.75; }
.effective { color: #87a3a3; font-size: .85rem; letter-spacing: .04em; }

.callout {
  margin: 2.2rem 0;
  padding: 1.3rem 1.5rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  color: #f3f8f6;
  background: rgba(11, 56, 64, .62);
}

ul, ol { padding-left: 1.35rem; }
li + li { margin-top: .5rem; }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  margin-top: 4rem;
  padding-top: 1.7rem;
  border-top: 1px solid var(--line);
}

nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: .45rem 0;
}

a { color: var(--sky); text-underline-offset: .24em; }
a:hover { color: #fff; }
a:focus-visible { outline: 3px solid var(--gold); outline-offset: 4px; }

@media (max-width: 520px) {
  main { width: min(100% - 1.5rem, 48rem); }
  h1 { margin-top: 3.5rem; }
  .callout { padding: 1.1rem; }
}

@media (prefers-reduced-motion: reduce) {
  .skip-link { transition: none; }
}