* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #111;
  color: #f5f5f5;
  line-height: 1.6;
}

.site-header {
  border-bottom: 1px solid #222;
}

.nav {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 24px;

  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  color: #f5f5f5;
  text-decoration: none;
  font-size: 1.3rem;
  font-weight: bold;
  letter-spacing: -1px;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: #aaa;
  text-decoration: none;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: #fff;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 70px 24px;
}

.hero {
  margin-bottom: 60px;
}

h1 {
  font-size: 3.5rem;
  margin: 0 0 10px;
}

h2 {
  margin-top: 50px;
  margin-bottom: 20px;
  font-size: 1.8rem;
}

h3 {
  margin-top: 0;
}

p {
  color: #cfcfcf;
  font-size: 1.1rem;
}

.tagline {
  font-size: 1.3rem;
  max-width: 650px;
}

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.project-card {
  border: 1px solid #333;
  border-radius: 12px;
  padding: 20px;
  background: #181818;
}

.about {
  max-width: 650px;
}

footer {
  margin-top: 70px;
  padding-top: 20px;
  border-top: 1px solid #222;

  color: #888;
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }

  .nav-links {
    gap: 18px;
  }

  h1 {
    font-size: 2.6rem;
  }

  main {
    padding-top: 50px;
  }
}