/* Basic reset & layout */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: #efefef;
  background: #2c2c2c;
  line-height: 1.5;
}

/* Accessibility: visible focus */
:focus-visible { outline: 3px solid #7dd3fc; outline-offset: 2px; }
.skip-link {
  position: absolute; left: -9999px; top: -9999px;
}
.skip-link:focus { left: 1rem; top: 1rem; background:#111; color:#fff; padding:.5rem .75rem; border-radius:.5rem; }

/* Header with centered image at the very top */
.site-header {
  display: grid;
  place-items: center;
  padding: 3rem 1rem 2rem;
  gap: .5rem;
  background: linear-gradient(180deg, rgba(0,0,0,.35), rgba(0,0,0,0));
}
.site-header .avatar {
  display: block;
  border-radius: 50%;
  border: 4px solid rgba(255,255,255,.15);
  max-width: 40vw; /* keeps it reasonable on mobile */
  height: auto;
}
.site-title {
  margin: .25rem 0 0;
  font-size: clamp(1.5rem, 2.5vw + 1rem, 2.5rem);
  letter-spacing: .5px;
}
.site-tagline {
  margin: 0;
  color: #cfcfcf;
  font-size: clamp(.95rem, .5vw + .8rem, 1.1rem);
}

/* Horizontal nav under header */
.site-nav {
  position: sticky; /* optional: keeps it visible on scroll */
  top: 0;
  backdrop-filter: blur(6px);
  background: rgba(20,20,20,.7);
  border-top: 1px solid rgba(255,255,255,.07);
  border-bottom: 1px solid rgba(255,255,255,.07);
}
.site-nav ul {
  margin: 0 auto;
  padding: .5rem 1rem;
  list-style: none;
  display: flex;
  gap: 1rem;
  justify-content: center;
  max-width: 900px;
}
.site-nav a {
  display: inline-block;
  padding: .5rem .75rem;
  border-radius: .5rem;
  color: #efefef;
  text-decoration: none;
}
.site-nav a:hover,
.site-nav a:focus-visible {
  background: rgba(255,255,255,.08);
}

/* Content */
.content {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem 3rem;
}
.content h2 { margin-top: 2rem; font-size: 1.35rem; }

/* Footer */
.site-footer {
  border-top: 1px solid rgba(255,255,255,.07);
  color: #bdbdbd;
  padding: 1.5rem 1rem 3rem;
  text-align: center;
}

/* Responsive tweaks */
@media (min-width: 768px) {
  .site-header { padding: 4rem 1rem 2.25rem; }
  .site-nav ul { gap: 1.25rem; }
}