:root {
  --accent: #0ea5e9;        /* sky-500 */
  --bg: #ffffff;
  --bg-muted: #f8fafc;     /* slate-50 */
  --border: #e5e7eb;       /* gray-200 */
  --text: #0f172a;         /* slate-900 */
  --text-muted: #475569;   /* slate-600 */
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, sans-serif;
  background: linear-gradient(
    to right,
    rgba(14, 165, 233, 0.06),
    white
  );
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
}

.hero {
  border-bottom: 1px solid var(--border);
}

.hero .container {
	text-align: center;
  	display: flex;	
  	flex-direction: column;
	justify-content: center;
	align-items: center;
	gap: 1em;
}

.hero img.logo {
  height: 6rem;
}

.hero h1 {
  margin: 0;
  font-size: 3rem;
  letter-spacing: -0.02em;
}

.hero .subtitle {
  max-width: 640px;
  font-size: 1.1rem;
  color: var(--text-muted);
  margin: 0;
  text-wrap: balance;
}

main.container {
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
	padding: 2.5rem 1.5rem;
}

section h2 {
  margin: 0;
  margin-bottom: 1rem;
  font-size: 1.75rem;
  letter-spacing: -0.01em;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

.card {
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.card p {
  margin-bottom: 0.75rem;
  color: var(--text-muted);
}

.muted {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.principles {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}

.principles li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.75rem;
}

.principles li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent);
}

code {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.15rem 0.4rem;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

footer {
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  body {
  	font-size: 14px;
  }

  .hero h1 {
    font-size: 2.3rem;
  }

  .hero img.logo {
  	height: 3rem;
  }

  .container {
    padding: 1.25rem;
  }

  main.container {
  	display: flex;
  	flex-direction: column;
  	gap: 1.25rem;
  	padding: 1.25rem;
  }

  section h2 {
  	font-size: 1.25rem;
  }
}