:root {
  --bg: #fbfaf8;
  --fg: #1c1a17;
  --muted: #6b6459;
  --border: #e4dfd6;
  --accent: #2f6f4e;
  --accent-soft: #e6f0ea;
  --tier2: #8a5a2b;
  --tier2-soft: #f3e7d8;
  --card-bg: #ffffff;
  --max-width: 880px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161512;
    --fg: #ece8e1;
    --muted: #a39c8e;
    --border: #33302a;
    --accent: #6fbf95;
    --accent-soft: #1e2c24;
    --tier2: #d7a25f;
    --tier2-soft: #2c2318;
    --card-bg: #1e1c18;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
}

.site-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1rem;
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--accent); }

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.section { margin-bottom: 2.5rem; }
.section h2 { font-size: 1.15rem; margin-bottom: 0.75rem; }
.section-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.section-note { color: var(--muted); font-size: 0.9rem; margin-top: -0.4rem; }

.filter-label { font-size: 0.9rem; color: var(--muted); }
.filter-label select { margin-left: 0.4rem; }

.card-grid { display: grid; gap: 1rem; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
}
.card h3 { margin: 0 0 0.35rem; font-size: 1.05rem; }
.card h3 a { color: var(--fg); text-decoration: none; }
.card h3 a:hover { color: var(--accent); }

.card-meta { font-size: 0.85rem; color: var(--muted); margin: 0 0 0.5rem; display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.card-meta .journal { font-style: italic; }
.card-abstract { font-size: 0.92rem; color: var(--fg); margin: 0; }

.badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}
.badge-tier2 { background: var(--tier2-soft); color: var(--tier2); }
.badge-thin, .badge-track-b { background: var(--border); color: var(--muted); }
.badge-followed { background: var(--accent); color: #fff; }

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

.more-link { font-size: 0.9rem; }
.more-link a { color: var(--accent); }

.pagination { display: flex; justify-content: space-between; margin-top: 1.5rem; font-size: 0.9rem; }
.pagination a { color: var(--accent); text-decoration: none; }

.article-page h1 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.article-page .authors { color: var(--muted); margin: 0.5rem 0; }
.article-page .abstract h2 { font-size: 1rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.mesh-terms { font-size: 0.88rem; color: var(--muted); }
.doi-link a { color: var(--accent); font-weight: 600; text-decoration: none; }

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer img { opacity: 0.8; }

.card[hidden] { display: none; }

.search-box { margin-bottom: 1.5rem; }
.search-label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.35rem; }
.search-box input[type="search"] {
  width: 100%;
  padding: 0.6rem 0.8rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--fg);
}
.search-box input[type="search"]:disabled { opacity: 0.6; }
.search-status { font-size: 0.85rem; color: var(--muted); margin: 0.4rem 0 0; min-height: 1.2em; }
.search-results-count { font-size: 0.9rem; color: var(--muted); margin-bottom: 0.75rem; }
.search-results-section[hidden] { display: none; }