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

body {
  background: #ffffff;
  color: #1a1a1a;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 64px 32px 80px;
}

/* Header */

header {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid #e5e5e5;
}

h1 {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.5px;
  margin-bottom: 6px;
}

.tagline {
  font-size: 1.05rem;
  color: #555;
  margin-bottom: 14px;
}

.contact {
  font-size: 0.9rem;
  color: #555;
}

.contact a {
  color: #555;
  text-decoration: none;
}

.contact a:hover {
  color: #1a1a1a;
  text-decoration: underline;
}

.sep {
  margin: 0 8px;
  color: #ccc;
}

/* About */

.about {
  margin-bottom: 48px;
}

.about p {
  font-size: 1rem;
  color: #333;
  max-width: 680px;
}

/* Skills */

.skills h2 {
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #888;
  margin-bottom: 28px;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 32px 40px;
}

.skill-group h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #aaa;
  margin-bottom: 10px;
}

.skill-group ul {
  list-style: none;
}

.skill-group ul li {
  font-size: 0.95rem;
  color: #1a1a1a;
  padding: 3px 0;
}

/* Footer */

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid #e5e5e5;
  font-size: 0.85rem;
  color: #999;
}

/* Responsive */

@media (max-width: 560px) {
  main {
    padding: 40px 20px 60px;
  }

  h1 {
    font-size: 1.9rem;
  }

  .contact {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .sep {
    display: none;
  }

  .skill-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px 24px;
  }
}