:root {
  --primary: #004080;
  --accent: #0072ce;
  --bg-light: #f9fafb;
  --text-dark: #1f2937;
  --text-muted: #6b7280;
  --border-color: #e5e7eb;
  --radius: 0.75rem;
  --shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
  --transition: all 0.2s ease-in-out;
}

body {
  font-family: "Segoe UI", "Roboto", "Helvetica Neue", sans-serif;
  margin: 0;
  background-color: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.7;
  font-size: 1rem;
}

main {
  max-width: 800px;
  margin: auto;
  background: white;
  padding: 2.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-top: 8px solid #004080;
}

h1 {
  margin: 0 0 1.5rem 0;
  font-size: 2rem;
  color: var(--primary);
  font-weight: 600;
}

p {
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
  color: var(--text-dark);
}

.inline-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  align-items: baseline;
  margin-bottom: 1.5rem;
}

.inline-meta p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.metadata {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.75rem 1.25rem;
  font-size: 1rem;
}

.metadata dt {
  font-weight: 600;
  color: var(--text-muted);
  text-align: right;
  white-space: nowrap;
  margin: 0;
}

.metadata dd {
  margin: 0;
  color: var(--text-dark);
}

.actions {
  margin-top: 2.5rem;
  text-align: center;
}

.button {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 1.75rem;
  text-decoration: none;
  font-weight: 500;
  border-radius: var(--radius);
  transition: var(--transition);
}

.button:hover,
.button:focus-visible {
  background: #003366;
}

.citation-tool {
  margin-top: 3rem;
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: var(--radius);
  background: #f8fafc;
}

.citation-tool h3 {
  margin-top: 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary);
}

.citation-tool label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-dark);
}

.citation-tool select {
  width: 100%;
  padding: 0.65rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: white;
  transition: var(--transition);
}

.citation-tool select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.copy-button {
  margin-top: 0.75rem;
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.6rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
}

.copy-button:hover,
.copy-button:focus-visible {
  background: #005fa3;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

a:hover,
a:focus-visible {
  text-decoration: underline;
  color: #005fa3;
}

.share-links {
  margin-top: 2rem;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.share-links span {
  font-weight: 600;
  margin-right: 0.5rem;
  white-space: nowrap;
}

.share-links a {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: #0366d6;
  transition: var(--transition);
}

.share-links a:hover,
.share-links a:focus-visible {
  text-decoration: underline;
}

.border {
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}