:root {
  --pt-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --pt-mono: "JetBrains Mono", "Fira Code", monospace;
  --pt-bg: #f8fafc;
  --pt-surface: #fff;
  --pt-border: #e2e8f0;
  --pt-text: #1e293b;
  --pt-text-secondary: #64748b;
  --pt-accent: #6366f1;
  --pt-accent-hover: #4f46e5;
  --pt-tag-bg: #ede9fe;
  --pt-tag-text: #5b21b6;
  --pt-source-biorxiv: #dc2626;
  --pt-source-biorxiv-bg: #fef2f2;
  --pt-source-pubmed: #0369a1;
  --pt-source-pubmed-bg: #f0f9ff;
  --pt-source-rss: #d97706;
  --pt-source-rss-bg: #fffbeb;
  --pt-source-medrxiv: #059669;
  --pt-source-medrxiv-bg: #ecfdf5;
  --pt-max-width: 1200px;
  --pt-header-h: 52px;
  --pt-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 14px; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--pt-font);
  color: var(--pt-text);
  background: var(--pt-bg);
  line-height: 1.5;
}

a { color: var(--pt-accent); text-decoration: none; }
a:hover { color: var(--pt-accent-hover); text-decoration: underline; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}

/* === Layout === */
.pt-container { max-width: var(--pt-max-width); margin: 0 auto; padding: 0 16px; }
.pt-layout { min-height: 100vh; display: flex; flex-direction: column; }
.pt-main { flex: 1; padding: 24px 0; }
.pt-content-layout { display: grid; grid-template-columns: 1fr; gap: 24px; }
.pt-content-layout.has-sidebar { grid-template-columns: 1fr 280px; }

/* === Header === */
.pt-header {
  background: var(--pt-gradient);
  height: var(--pt-header-h);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(99, 102, 241, 0.3);
}

.pt-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
}

.pt-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
}
.pt-logo:hover { text-decoration: none; color: #e0e7ff; }
.pt-logo svg { flex-shrink: 0; }

/* === Navigation === */
.pt-nav ul { display: flex; gap: 2px; list-style: none; }
.pt-nav a {
  display: block;
  padding: 6px 12px;
  font-size: 13px;
  color: rgba(255,255,255,0.85);
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.15s;
}
.pt-nav a:hover, .pt-nav a.is-active {
  color: #fff;
  background: rgba(255,255,255,0.2);
  text-decoration: none;
}

/* === Search === */
.pt-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.2);
  border-radius: 20px;
  padding: 2px 4px 2px 12px;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.3);
  transition: all 0.2s;
}
.pt-search:focus-within {
  background: rgba(255,255,255,0.35);
  border-color: rgba(255,255,255,0.6);
}
.pt-search__input {
  background: none;
  border: none;
  outline: none;
  color: #fff;
  font-size: 13px;
  width: 140px;
  padding: 4px 0;
}
.pt-search__input::placeholder { color: rgba(255,255,255,0.7); }
.pt-search__btn {
  background: none;
  border: none;
  cursor: pointer;
  color: rgba(255,255,255,0.9);
  padding: 4px;
  display: flex;
  align-items: center;
}
.pt-search__btn:hover { color: #fff; }

/* === Footer === */
.pt-footer {
  border-top: 1px solid var(--pt-border);
  padding: 16px 0;
  font-size: 12px;
  color: var(--pt-text-secondary);
  background: var(--pt-surface);
}
.pt-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* === Source Badges === */
.pt-meta__source {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.pt-source--biorxiv {
  background: var(--pt-source-biorxiv-bg);
  color: var(--pt-source-biorxiv);
  border: 1px solid #fecaca;
}
.pt-source--pubmed {
  background: var(--pt-source-pubmed-bg);
  color: var(--pt-source-pubmed);
  border: 1px solid #bae6fd;
}
.pt-source--medrxiv {
  background: var(--pt-source-medrxiv-bg);
  color: var(--pt-source-medrxiv);
  border: 1px solid #a7f3d0;
}
.pt-source--rss {
  background: var(--pt-source-rss-bg);
  color: var(--pt-source-rss);
  border: 1px solid #fde68a;
}

/* === Article Teaser (list item) === */
.pt-article-teaser {
  padding: 4px 0;
  transition: transform 0.1s;
}
.pt-article-teaser:hover {
  transform: translateX(2px);
}
.pt-teaser__title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 6px;
}
.pt-teaser__title a { color: var(--pt-text); transition: color 0.15s; }
.pt-teaser__title a:hover { color: var(--pt-accent); text-decoration: none; }
.pt-teaser__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  color: var(--pt-text-secondary);
  margin-bottom: 6px;
}
.pt-teaser__summary {
  font-size: 12.5px;
  color: var(--pt-text-secondary);
  line-height: 1.5;
  max-height: 3em;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.pt-teaser__summary p { margin: 0; display: inline; }
.pt-teaser__summary .field { display: inline; }
.pt-teaser__summary .field__item { display: inline; }
.pt-teaser__tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; }

/* === Tags === */
.pt-article__tags .field__item,
.pt-teaser__tags .field__item {
  display: inline-block;
  padding: 2px 10px;
  background: var(--pt-tag-bg);
  color: var(--pt-tag-text);
  font-size: 11px;
  border-radius: 12px;
  line-height: 1.4;
  font-weight: 500;
}

/* === Article Full === */
.pt-article-full { max-width: 800px; }
.pt-article__header {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--pt-border);
}
.pt-article__title {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 12px;
  color: var(--pt-text);
}
.pt-article__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--pt-text-secondary);
}
.pt-meta__type {
  display: inline-block;
  padding: 2px 8px;
  background: #f0fdf4;
  color: #166534;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  border: 1px solid #bbf7d0;
}
.pt-article__body { line-height: 1.7; }
.pt-article__abstract, .pt-article__abstract-cn { margin-bottom: 16px; }
.pt-article__abstract h2, .pt-article__abstract-cn h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--pt-accent);
  margin-bottom: 8px;
  font-weight: 700;
}
.pt-article__authors { font-size: 13px; color: var(--pt-text-secondary); margin: 12px 0; }
.pt-article__link { margin: 16px 0; }
.pt-article__link a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  background: var(--pt-accent);
  color: #fff;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  transition: background 0.15s;
}
.pt-article__link a:hover { background: var(--pt-accent-hover); text-decoration: none; }
.pt-article__tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 20px; }

/* === Views / Content lists === */
.views-row + .views-row {
  border-top: 1px solid var(--pt-border);
  padding-top: 12px;
  margin-top: 12px;
}
.view-content {
  background: var(--pt-surface);
  border-radius: 10px;
  padding: 16px 20px;
  border: 1px solid var(--pt-border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.view-header { margin-bottom: 12px; font-size: 12px; color: var(--pt-text-secondary); }
.view-empty { padding: 40px; text-align: center; color: var(--pt-text-secondary); }

/* === Pager === */
.pager { margin-top: 24px; }
.pager__items { display: flex; gap: 4px; justify-content: center; list-style: none; }
.pager__item a, .pager__item.is-active span {
  display: block;
  padding: 6px 12px;
  font-size: 12px;
  border-radius: 6px;
  color: var(--pt-text-secondary);
  font-weight: 500;
}
.pager__item a:hover { background: var(--pt-tag-bg); text-decoration: none; color: var(--pt-accent); }
.pager__item.is-active span {
  background: var(--pt-accent);
  color: #fff;
  font-weight: 700;
}

/* === Page title === */
.block-page-title-block h1,
.page-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--pt-text);
}

/* === Sidebar === */
.pt-sidebar .block { margin-bottom: 20px; }
.pt-sidebar .block__title,
.pt-sidebar h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--pt-accent);
  margin-bottom: 8px;
  font-weight: 700;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--pt-tag-bg);
}
.pt-sidebar ul { list-style: none; }
.pt-sidebar li { margin-bottom: 4px; }
.pt-sidebar a { font-size: 13px; color: var(--pt-text); }
.pt-sidebar a:hover { color: var(--pt-accent); }

/* === Messages === */
.messages { padding: 10px 14px; border-radius: 8px; margin-bottom: 12px; font-size: 13px; }
.messages--status { background: #ecfdf5; border: 1px solid #a7f3d0; color: #065f46; }
.messages--warning { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; }
.messages--error { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; }

/* === Tabs === */
.tabs { margin-bottom: 16px; }
.tabs ul { display: flex; gap: 2px; list-style: none; border-bottom: 2px solid var(--pt-border); }
.tabs a {
  display: block;
  padding: 8px 14px;
  font-size: 12px;
  color: var(--pt-text-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-weight: 500;
}
.tabs a:hover, .tabs a.is-active {
  color: var(--pt-accent);
  border-bottom-color: var(--pt-accent);
  text-decoration: none;
}

/* === Responsive === */
@media (max-width: 768px) {
  .pt-content-layout.has-sidebar { grid-template-columns: 1fr; }
  .pt-header__inner { padding: 0 12px; }
  .pt-nav ul { gap: 0; }
  .pt-nav a { padding: 6px 8px; font-size: 12px; }
  .pt-footer__inner { flex-direction: column; gap: 4px; text-align: center; }
  .pt-search__input { width: 100px; }
}

/* === Drupal admin toolbar offset === */
body.toolbar-fixed { padding-top: 0 !important; }
body.toolbar-fixed .pt-header { top: 79px; }
body.toolbar-horizontal.toolbar-tray-open .pt-header { top: 79px; }

/* === Mobile nav toggle === */
.pt-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: rgba(255,255,255,0.9);
}
@media (max-width: 600px) {
  .pt-nav-toggle { display: block; }
  .pt-nav { display: none; position: absolute; top: var(--pt-header-h); right: 0; background: #4f46e5; border-radius: 0 0 8px 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.2); padding: 8px; }
  .pt-nav.is-open { display: block; }
  .pt-nav ul { flex-direction: column; }
  .pt-search { display: none; }
}

/* === Field wrappers cleanup === */
.field--type-text-long, .field--type-string, .field--type-link,
.field--type-entity-reference, .field--type-datetime { display: inline; }
.field__items { display: inline; }
.field__item { display: inline; }

/* === Search results === */
.search-results { list-style: none; }
.search-result { padding: 12px 0; border-bottom: 1px solid var(--pt-border); }
.search-result__title { font-size: 15px; font-weight: 700; }
.search-result__snippet { font-size: 13px; color: var(--pt-text-secondary); margin-top: 4px; }