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

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background-color: #f3f4f6;
  color: #111827;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background-color: #ffffffcc;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #e5e7eb;
}

.nav__brand {
  font-weight: 600;
}

.nav__links a {
  margin-left: 1rem;
  font-size: 0.9rem;
  text-decoration: none;
  color: #4b5563;
}

.nav__links a:hover {
  color: #2563eb;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
}

.hero h1 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.hero h2 {
  font-size: 1.25rem;
  color: #2563eb;
  margin-bottom: 1rem;
}

.hero p {
  max-width: 36rem;
  margin: 0 auto 1.5rem;
  color: #4b5563;
}

.hero__buttons {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1.1rem;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  text-decoration: none;
  border: 1px solid transparent;
}

.btn--primary {
  background-color: #2563eb;
  color: white;
}

.btn--primary:hover {
  background-color: #1d4ed8;
}

.btn--outline {
  border-color: #2563eb;
  color: #2563eb;
}

.btn--outline:hover {
  background-color: #eff6ff;
}

.section {
  padding: 3rem 0;
}

.section h2 {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: 2rem;
}

.section--muted {
  background-color: #f9fafb;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  margin: 0 -1.5rem;
}

.projects {
  display: grid;
  grid-template-columns: 1fr !important;
  gap: 1.25rem;
}

.card {
  background-color: #ffffff;
  border-radius: 0.75rem;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
  border: 1px solid #e5e7eb;
}

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

.card p {
  margin: 0.25rem 0;
  font-size: 0.9rem;
  color: #4b5563;
}

.card__tech {
  font-size: 0.8rem;
  color: #6b7280;
}

.card a {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: #2563eb;
  text-decoration: none;
}

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

.about {
  max-width: 40rem;
  margin: 0 auto;
  color: #4b5563;
  font-size: 0.95rem;
}

.footer {
  text-align: center;
  font-size: 0.8rem;
  color: #6b7280;
  padding: 1.5rem 1rem 2rem;
  border-top: 1px solid #e5e7eb;
  margin-top: 2rem;
}

@media (max-width: 640px) {
  .nav {
    padding-inline: 1rem;
  }
  main {
    padding-inline: 1rem;
  }
}

.card-header {
  margin-bottom: 0.75rem; /* space between header and description */
}

.card-header h3 {
  margin: 0; /* remove default big h3 margin */
}

.card-header .date {
  display: block;
  font-size: 0.85rem;
  color: #6b7280;
  margin-top: 0.15rem;
}