* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: #f7f8fa;
  color: #24292f;
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

header,
main {
  width: min(100% - 40px, 960px);
  margin: 0 auto;
}

header {
  padding: 72px 0 44px;
  border-bottom: 1px solid #d8dee4;
}

header h1 {
  margin: 0 0 8px;
  font-size: 42px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

header p {
  margin: 4px 0;
  color: #57606a;
  font-size: 18px;
}

main {
  padding: 16px 0 80px;
}

section {
  margin-top: 56px;
}

section h2 {
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid #d8dee4;
  font-size: 28px;
  line-height: 1.3;
}

a {
  color: #0969da;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.project {
  margin-bottom: 28px;
  padding: 26px 28px;
  background: #ffffff;
  border: 1px solid #d8dee4;
  border-radius: 12px;
  box-shadow: 0 3px 12px rgba(27, 31, 36, 0.05);
}

.project h3 {
  margin: 0 0 6px;
  font-size: 22px;
}

.project p {
  margin: 10px 0;
}

.project-meta {
  margin-top: 0;
  color: #57606a;
  font-size: 14px;
}

.publication {
  margin-bottom: 18px;
  padding: 20px 24px;
  background: #ffffff;
  border-left: 4px solid #0969da;
  border-radius: 6px;
}

.publication p {
  margin: 0;
}

#about p {
  max-width: 800px;
}

#contact {
  padding-bottom: 30px;
}

#contact p {
  margin: 6px 0;
}

@media (max-width: 640px) {
  header,
  main {
    width: min(100% - 28px, 960px);
  }

  header {
    padding-top: 48px;
  }

  header h1 {
    font-size: 34px;
  }

  header p {
    font-size: 16px;
  }

  section h2 {
    font-size: 24px;
  }

  .project {
    padding: 20px;
  }
}