:root {
  --bg: #070b16;
  --card: rgba(14, 22, 42, 0.82);
  --text: #e8eefc;
  --muted: #9aa8c7;
  --accent: #7dd3fc;
  --line: rgba(125, 211, 252, 0.28);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1100px 520px at 8% -8%, #1b2a55 0%, transparent 55%),
    radial-gradient(800px 460px at 108% 8%, #12324a 0%, transparent 50%),
    var(--bg);
}

.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 12% 18%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 28% 72%, #cfe8ff 50%, transparent 51%),
    radial-gradient(1px 1px at 63% 22%, #fff 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 81% 64%, #9ad8ff 50%, transparent 51%),
    radial-gradient(1px 1px at 47% 48%, #fff 50%, transparent 51%);
  opacity: 0.5;
}

main {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 20px 72px;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
  font-size: 0.95rem;
}

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

.nav a:hover {
  text-decoration: underline;
}

.hero {
  margin-bottom: 36px;
}

.mark {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  margin-bottom: 18px;
  background: radial-gradient(circle at 35% 30%, #fff, #7dd3fc 35%, #0369a1 70%, #0b1020 71%);
  box-shadow: 0 0 24px rgba(125, 211, 252, 0.4);
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(2rem, 5vw, 3.1rem);
  letter-spacing: 0.02em;
}

.lede,
.prose p,
.prose li {
  color: var(--muted);
  line-height: 1.65;
  font-size: 1.05rem;
}

.lede {
  margin: 0;
  max-width: 42rem;
}

h2 {
  margin: 28px 0 14px;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 14px;
}

article.card,
.card {
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--card);
}

article.card h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

article.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.98rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 14px;
}

.btn {
  display: inline-block;
  color: var(--bg);
  background: var(--accent);
  text-decoration: none;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 999px;
}

.btn.ghost,
article.card a {
  color: var(--accent);
  background: transparent;
  font-weight: 600;
  text-decoration: none;
}

article.card a {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.92rem;
}

article.card a:hover,
.nav a:hover,
.btn.ghost:hover {
  text-decoration: underline;
}

.prose ul {
  margin: 0;
  padding-left: 1.2rem;
}

.prose li + li {
  margin-top: 8px;
}

footer {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.55;
}

footer a {
  color: var(--accent);
}