:root {
  --ink: #20252b;
  --muted: #626b75;
  --line: #d8dde2;
  --link: #1456a0;
  --paper: #fff;
  --max-width: 920px;
}

* { box-sizing: border-box; }
html { background: var(--paper); }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

a { color: var(--link); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--ink); }
button, input, textarea { font: inherit; }

.page {
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 34px;
}

.site-header-main {
  display: flex;
  align-items: baseline;
  gap: 20px;
  min-width: 0;
}

.site-name {
  color: var(--ink);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
}

.site-name:hover { color: var(--link); }
.home-link { font-size: 14px; }
.language-control, .article-language-control { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; }
.language-control select, .article-language-control select { border: 1px solid var(--line); border-radius: 0; padding: 3px 5px; color: var(--ink); background: var(--paper); }
.language-control select:focus, .article-language-control select:focus { border-color: var(--link); outline: 2px solid rgba(20, 86, 160, .14); outline-offset: 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
main { min-width: 0; }
.index-section { margin: 0 0 38px; }
.index-section h1, .index-section h2, .category-header h1, .article-header h1, .not-found h1 { margin: 0; color: var(--ink); font-weight: 600; }
.index-section h1, .index-section h2 { font-size: 18px; line-height: 1.4; }
.category-header { margin-bottom: 28px; }
.category-header h1, .article-header h1 { font-size: 24px; line-height: 1.4; }

.category-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.category-links a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.empty-note { margin: 8px 0 0; color: var(--muted); }

.article-list {
  display: grid;
  gap: 14px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.article-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 8px 24px;
}

.article-title { font-size: 16px; }
.article-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0 16px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.article-meta a { color: inherit; }
.article-meta a:hover { color: var(--link); }
.subcategory-index { margin-top: 0; }
.article-header { margin-bottom: 28px; }
.article-header .article-meta { justify-content: flex-start; margin-top: 9px; }
.article-language-control { margin-top: 12px; }

.pdf-section { margin-top: 4px; }
.pdf-pages { display: grid; gap: 18px; }
.pdf-page { position: relative; width: 100%; max-width: 100%; overflow: hidden; background: var(--paper); }
.pdf-canvas { display: block; width: 100%; height: auto; }
.pdf-text-layer { position: absolute; inset: 0; overflow: hidden; line-height: 1; text-size-adjust: none; transform-origin: 0 0; user-select: text; }
.pdf-text-layer :is(span, br) { position: absolute; color: transparent; white-space: pre; cursor: text; transform-origin: 0 0; }
.pdf-text-layer ::selection { background: rgba(0, 0, 255, .25); }
.pdf-status { margin: 0; color: var(--muted); }

.pdf-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin: 8px 0 0;
  font-size: 14px;
}

.not-found { padding-top: 20px; }
.not-found p { margin-top: 8px; }

@media (max-width: 680px) {
  .page { width: min(100% - 28px, var(--max-width)); padding-top: 20px; }
  .site-header { margin-bottom: 28px; }
  .site-header-main { gap: 12px; }
  .article-row { grid-template-columns: 1fr; gap: 2px; }
  .article-meta, .article-header .article-meta { justify-content: flex-start; }
  .category-header h1, .article-header h1 { font-size: 22px; }
}