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

body {
  background: #0a0a0a;
  color: #e0e0e0;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', Menlo, monospace;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #e0e0e0;
  text-decoration: none;
}

a:hover {
  color: #fff;
}

/* --- Mobile-first base (< 640px) --- */

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

nav {
  margin-bottom: 2.5rem;
}

nav a {
  color: #666;
  margin-right: 0.75rem;
}

nav a:hover,
nav a.active {
  color: #e0e0e0;
}

nav a::before {
  content: '· ';
}

nav a:first-child::before {
  content: '';
}

.hero {
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  flex-shrink: 0;
}

.hero h1 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.hero p {
  color: #666;
}

.social-links {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  color: #666;
  font-size: 0.85rem;
}

.social-links a {
  color: #666;
  display: inline-flex;
  align-items: center;
  transition: color 0.15s;
}

.social-links a:hover {
  color: #e0e0e0;
}

section {
  margin-bottom: 2rem;
}

section h2 {
  font-size: 0.8rem;
  font-weight: 600;
  color: #666;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid #1a1a1a;
  padding-bottom: 0.5rem;
}

.project {
  padding: 0.6rem 0;
}

.project-name {
  font-weight: 500;
}

.project-desc {
  display: block;
  color: #666;
  font-size: 0.8rem;
  margin-top: 0.15rem;
}

.auth-only {
  display: none;
}

.auth-only.visible {
  display: block;
}


/* --- Desktop (≥ 640px) --- */

@media (min-width: 640px) {
  body {
    font-size: 15px;
  }

  .container {
    padding: 3rem 2rem;
  }

  nav {
    margin-bottom: 4rem;
  }

  nav a {
    margin-right: 1rem;
  }

  .hero {
    margin-bottom: 4rem;
    gap: 1.25rem;
  }

  .avatar {
    width: 96px;
    height: 96px;
  }

  .hero h1 {
    font-size: 1.2rem;
  }

  section {
    margin-bottom: 3rem;
  }

  section h2 {
    font-size: 0.85rem;
    margin-bottom: 1rem;
  }

  .project {
    padding: 0.75rem 0;
  }

  .project-desc {
    font-size: 0.85rem;
    margin-top: 0.2rem;
  }

}