:root {
  --bg: #0f1419;
  --surface: #1a1f29;
  --border: #2a3441;
  --text: #e6e9ed;
  --muted: #8b95a3;
  --accent: #5b9dff;
  --accent-hover: #7eb4ff;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Calibri, Aptos, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 2rem 1.5rem;
  max-width: 880px;
  margin-inline: auto;
  line-height: 1.5;
}

header {
  margin-bottom: 1.5rem;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.85rem;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.tab {
  background: none;
  border: none;
  color: var(--muted);
  padding: 0.6rem 1rem;
  font-size: 0.95rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  font-family: inherit;
  transition: color 0.15s, border-color 0.15s;
}

.tab:hover { color: var(--text); }

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

main {
  min-height: 200px;
}

.section-heading {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 1.5rem 0 0.75rem;
  font-weight: 600;
}

.section-heading:first-child { margin-top: 0; }

.project-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.project-list li {
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  transition: border-color 0.15s, transform 0.05s;
}

.project-list li:hover {
  border-color: var(--accent);
}

.project-list a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.project-list a:hover { color: var(--accent-hover); text-decoration: underline; }

.project-desc {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 0.2rem;
}

.loading, .empty {
  color: var(--muted);
  font-style: italic;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

footer a {
  color: var(--muted);
  text-decoration: none;
}

footer a:hover { color: var(--text); text-decoration: underline; }

@media (max-width: 600px) {
  body { padding: 1.25rem 1rem; }
  h1 { font-size: 1.5rem; }
}