:root {
  --bg: #fafaf4;
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #a6ce39;       /* ORCID green, matches sparql-desktop */
  --accent-dark: #8eb22f;
  --border: #e5e5e0;
  --card-bg: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.55;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 4rem;
}

.masthead {
  text-align: center;
  margin-bottom: 3rem;
}

.masthead h1 {
  margin: 0 0 0.5rem;
  font-size: 3rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.masthead h1::before {
  content: '📡 ';
  font-size: 2.2rem;
  vertical-align: 0.05em;
}

.tagline {
  max-width: 38rem;
  margin: 0 auto;
  font-size: 1.05rem;
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover {
  border-color: var(--accent);
}

.card header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.6rem;
  margin-bottom: 0.1rem;
}

.card h2 {
  margin: 0 0 0.2rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.card-sub {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.card p {
  margin: 0;
  font-size: 0.92rem;
}

.card code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85em;
  background: var(--bg);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

.features {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.features li {
  margin-bottom: 0.15rem;
}

.card-actions {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 0.5rem;
}

.card-actions a {
  display: inline-block;
  padding: 0.5rem 0.95rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 6px;
  text-decoration: none;
  border: 1px solid var(--border);
}

.card-actions a.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.card-actions a.primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.card-actions a.secondary {
  background: transparent;
  color: var(--fg);
}

.card-actions a.secondary:hover {
  border-color: var(--muted);
}

.site-footer {
  margin-top: 3.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

.site-footer a {
  color: inherit;
  text-decoration: underline;
}

a {
  color: var(--accent-dark);
}

a:hover {
  color: var(--accent);
}

@media (max-width: 600px) {
  .masthead h1 {
    font-size: 2.2rem;
  }
  .page {
    padding: 2rem 1rem 3rem;
  }
}