:root {
  --accent: #0066cc;
  --bg: #f9fafc;
  --text: #222;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.card {
  max-width: 900px;
  margin: 3rem auto;
  background: #fff;
  padding: 2rem 3rem;
  border-radius: 18px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.06);
}

h1 {
  margin: 0;
  font-size: 2rem;
  color: var(--accent);
}

h2 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-size: 1.4rem;
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  padding-bottom: 0.25rem;
}

section.papers ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

section.papers li {
  margin-bottom: 0.75rem;
  position: relative;
  padding-left: 1.25rem;
}

section.papers li::before {
  content: "\2022";
  position: absolute;
  left: 0;
  top: 0.15rem;
  color: var(--accent);
  font-size: 1.1rem;
}

a.doi {
  text-decoration: none;
  color: inherit;
}

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

.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  color: var(--accent);
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

.author {
  font-weight: 600;
}

.note {
  font-size: 0.9rem;
  color: #666;
  margin-top: 2rem;
  font-style: italic;
}