*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --colour-bg: #0a0e17;
  --colour-surface: #131a2b;
  --colour-border: #1e2a42;
  --colour-text: #e2e8f0;
  --colour-text-muted: #94a3b8;
  --colour-accent: #38bdf8;
  --colour-accent-dim: #0c4a6e;
  --font-sans: system-ui, -apple-system, sans-serif;
  --max-width: 72rem;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--colour-bg);
  color: var(--colour-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Hero */

.hero {
  padding: 6rem 0 4rem;
  text-align: center;
  background:
    radial-gradient(
      ellipse at 50% 0%,
      var(--colour-accent-dim) 0%,
      transparent 60%
    );
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--colour-text-muted);
  max-width: 36rem;
  margin: 0 auto 2rem;
}

.status {
  display: inline-block;
  padding: 0.4rem 1.2rem;
  border: 1px solid var(--colour-accent);
  border-radius: 2rem;
  color: var(--colour-accent);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Features */

.features {
  padding: 4rem 0;
}

.features h2 {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: 2.5rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(
    auto-fit,
    minmax(18rem, 1fr)
  );
  gap: 1.5rem;
}

.feature-card {
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.feature-card h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
  color: var(--colour-accent);
}

.feature-card p {
  color: var(--colour-text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* About */

.about {
  padding: 4rem 0;
  border-top: 1px solid var(--colour-border);
}

.about h2 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.about p {
  color: var(--colour-text-muted);
  max-width: 48rem;
  margin-bottom: 1rem;
}

/* Footer */

footer {
  margin-top: auto;
  padding: 2rem 0;
  border-top: 1px solid var(--colour-border);
}

.legal {
  text-align: center;
  color: var(--colour-text-muted);
  font-size: 0.8125rem;
}