/* IAPR TC10/TC11 Catalog - lightweight design system.
   No external CSS framework. Designed for accessibility and dark-mode support. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-elev: #ffffff;
  --fg: #1a1a1a;
  --fg-muted: #5b6471;
  --border: #e1e4e8;
  --accent: #1f6feb;
  --accent-fg: #ffffff;
  --pill-dataset: #1a7f37;
  --pill-software: #8250df;
  --pill-model: #d63384;
  --pill-competition: #bf8700;
  --pill-publication: #0969da;
  --pill-params: #6f42c1;
  --pill-default: #57606a;
  --radius: 8px;
  --max-width: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-soft: #161b22;
    --bg-elev: #161b22;
    --fg: #e6edf3;
    --fg-muted: #8b949e;
    --border: #30363d;
    --accent: #58a6ff;
    --accent-fg: #0d1117;
  }
}

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

html { font-family: var(--font); line-height: 1.55; color: var(--fg); background: var(--bg); }
body { margin: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.25; margin-top: 1.5em; margin-bottom: 0.5em; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.15rem; }
code, pre { font-family: var(--font-mono); }
pre { background: var(--bg-soft); padding: 1rem; border-radius: var(--radius); overflow-x: auto; }
img { max-width: 100%; height: auto; }

.skip-link {
  position: absolute; left: -1000px; top: 0;
  background: var(--accent); color: var(--accent-fg);
  padding: 0.5rem 1rem; z-index: 1000;
}
.skip-link:focus { left: 0; }

/* ============================================================== Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(140%) blur(6px);
}
.site-header__inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding: 0.75rem 1rem;
}
.site-header__nav-cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1.25rem;
}
.site-brand { display: inline-flex; gap: 0.5rem; align-items: center; color: var(--fg); font-weight: 600; }
.site-brand:hover { text-decoration: none; }
.site-brand__logo {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2rem; height: 2rem; border-radius: var(--radius);
  background: var(--accent); color: var(--accent-fg);
  font-weight: 700; font-size: 0.85rem;
}
.site-nav ul { list-style: none; padding: 0; margin: 0; display: flex; gap: 0.25rem; flex-wrap: wrap; }
.site-nav a {
  display: inline-block; padding: 0.4rem 0.8rem;
  border-radius: var(--radius); color: var(--fg);
}
.site-nav__action {
  font-weight: 600;
}
.site-nav--actions .site-nav__action {
  background: var(--accent);
  color: var(--accent-fg);
}
.site-nav--actions .site-nav__action:hover {
  filter: brightness(1.06);
}
.site-nav--actions .site-nav__action[aria-current="page"] {
  filter: brightness(0.95);
}
.site-nav--primary a[aria-current="page"],
.site-nav--primary a:hover {
  background: var(--bg-soft);
}
.site-nav--primary a:hover,
.site-nav--primary a:focus-visible {
  text-decoration: none;
}
.site-nav a[aria-current="page"]:not(.site-nav__action) { background: var(--bg-soft); }
.site-nav a:hover:not(.site-nav__action) { background: var(--bg-soft); text-decoration: none; }

/* ============================================================== Main */
.site-main {
  max-width: var(--max-width); margin: 0 auto; padding: 1.5rem 1rem 3rem;
}

/* ============================================================== Footer */
.site-footer {
  border-top: 1px solid var(--border); background: var(--bg-soft);
  margin-top: 3rem;
}
.site-footer__inner {
  max-width: var(--max-width); margin: 0 auto; padding: 1.5rem 1rem;
}
.muted { color: var(--fg-muted); }
.small { font-size: 0.85rem; }

/* ============================================================== Pills */
.pill {
  display: inline-block; padding: 0.15rem 0.55rem; border-radius: 999px;
  font-size: 0.75rem; font-weight: 600; background: var(--pill-default); color: white;
  text-transform: uppercase; letter-spacing: 0.02em;
  margin-right: 0.25rem;
}
.pill--dataset { background: var(--pill-dataset); }
.pill--software { background: var(--pill-software); }
.pill--model { background: var(--pill-model); }
.pill--competition { background: var(--pill-competition); }
.pill--publication { background: var(--pill-publication); }
.pill--params { background: var(--pill-params); }
.pill--type { background: var(--pill-default); font-size: 0.7rem; }
.pill--status-active { background: #1a7f37; }
.pill--status-maintained { background: #1f6feb; }
.pill--status-stale { background: #bf8700; }
.pill--status-archived { background: #6e7781; }
.pill--status-unknown { background: #6e7781; }

/* ============================================================== Entries */
.entry__header { border-bottom: 1px solid var(--border); padding-bottom: 1rem; margin-bottom: 1.5rem; }
.entry__title { margin-top: 0.3rem; }
.entry__thumbnail {
  display: block; max-height: 320px; width: auto; max-width: 100%;
  border-radius: var(--radius); margin: 1rem 0;
}
.breadcrumb { color: var(--fg-muted); font-size: 0.9rem; margin: 0.5rem 0 0; }
.entry__meta {
  display: grid; grid-template-columns: max-content 1fr;
  column-gap: 1rem; row-gap: 0.3rem; margin: 1rem 0 0;
}
.entry__meta dt { color: var(--fg-muted); font-weight: 600; }
.entry__meta dd { margin: 0; }
.author-list, .keyword-list, .task-list { list-style: none; padding: 0; margin: 0; }
.keyword-list li {
  display: inline-block; background: var(--bg-soft); border: 1px solid var(--border);
  padding: 0.1rem 0.5rem; border-radius: var(--radius); margin: 0 0.25rem 0.25rem 0;
  font-size: 0.85rem;
}
.author-list li { margin: 0.1rem 0; }
.task-list li { padding: 0.5rem 0; border-bottom: 1px solid var(--border); }
.task-list li:last-child { border-bottom: none; }

/* ============================================================== Downloads table */
.downloads { margin: 1.5rem 0; }
.downloads__table {
  width: 100%; border-collapse: collapse; background: var(--bg-elev);
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
}
.downloads__table th, .downloads__table td {
  padding: 0.6rem 0.8rem; text-align: left; vertical-align: top;
  border-bottom: 1px solid var(--border);
}
.downloads__table th { background: var(--bg-soft); font-weight: 600; }
.downloads__table tr:last-child td { border-bottom: none; }
.downloads__filename { font-weight: 600; word-break: break-all; }

/* ============================================================== Format card */
.format-card {
  margin: 1.5rem 0;
  padding: 1.25rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.format-card h3 { margin-top: 1.25rem; margin-bottom: 0.5rem; font-size: 1rem; }
.format-card pre { background: var(--bg-elev); }
.format-card__meta { margin: 0.5rem 0 0; }
.split-list, .loader-list { list-style: none; padding: 0; margin: 0; }
.split-list li, .loader-list li { padding: 0.2rem 0; }
.loader-list li { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }

/* ============================================================== Buttons */
.btn {
  display: inline-block; padding: 0.4rem 0.8rem; border-radius: var(--radius);
  background: var(--bg-soft); color: var(--fg); border: 1px solid var(--border);
  text-decoration: none; font-size: 0.9rem; cursor: pointer;
}
.btn:hover { background: var(--bg-elev); text-decoration: none; }
.btn--small { padding: 0.2rem 0.55rem; font-size: 0.8rem; margin-right: 0.3rem; }
.btn--primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.btn--primary:hover { filter: brightness(1.08); }

/* ============================================================== Home / hero */
.hero {
  display: grid; gap: 1.5rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border); margin-bottom: 2rem;
}
.hero h1 { font-size: 2.25rem; margin: 0; }
.hero p.lead { font-size: 1.1rem; max-width: 60ch; color: var(--fg-muted); }
.hero__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin: 2rem 0; }
.stat { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; text-align: center; }
.stat strong { display: block; font-size: 1.75rem; }
.stat span { color: var(--fg-muted); font-size: 0.9rem; }

/* ============================================================== Browse page */
.browse-layout { display: grid; gap: 1.5rem; grid-template-columns: 1fr; }
@media (min-width: 900px) {
  .browse-layout { grid-template-columns: 260px 1fr; }
}
.browse-sidebar {
  background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; height: max-content;
}
.browse-sidebar h2 { font-size: 1rem; margin: 1rem 0 0.5rem; }
.browse-sidebar h2:first-child { margin-top: 0; }
.facet-list { list-style: none; padding: 0; margin: 0; max-height: 220px; overflow-y: auto; }
.facet-list li { margin: 0.1rem 0; }
.facet-list label { display: flex; gap: 0.5rem; align-items: center; cursor: pointer; }
.facet-list .count { color: var(--fg-muted); font-size: 0.8rem; margin-left: auto; }

.browse-toolbar {
  display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center;
  margin-bottom: 1rem;
}
.browse-toolbar input[type="search"] {
  flex: 1; min-width: 200px;
  padding: 0.5rem 0.75rem; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--bg-elev); color: var(--fg);
  font: inherit;
}
.browse-toolbar select {
  padding: 0.5rem 0.75rem; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--bg-elev); color: var(--fg);
  font: inherit;
}
.browse-results {
  display: grid; gap: 1rem; grid-template-columns: 1fr;
}
@media (min-width: 700px) {
  .browse-results { grid-template-columns: 1fr 1fr; }
}

.entry-card {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; display: flex; flex-direction: column; gap: 0.5rem;
}
.entry-card h3 { margin: 0 0 0.2rem; font-size: 1.1rem; }
.entry-card h3 a { color: var(--fg); }
.entry-card h3 a:hover { color: var(--accent); }
.entry-card__meta { color: var(--fg-muted); font-size: 0.85rem; display: flex; gap: 0.5rem; flex-wrap: wrap; }
.entry-card__excerpt { color: var(--fg-muted); font-size: 0.9rem; }
.entry-card__pills { display: flex; flex-wrap: wrap; gap: 0.25rem; }
.no-results { padding: 1.5rem; background: var(--bg-soft); border-radius: var(--radius); text-align: center; }

/* ============================================================== Submit form */
.submit-form {
  display: grid; gap: 1rem; max-width: 760px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
}
.submit-form fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; }
.submit-form legend { padding: 0 0.5rem; font-weight: 600; }
.field { display: grid; gap: 0.25rem; margin: 0.5rem 0; }
.field label { font-weight: 600; }
.field input, .field select, .field textarea {
  font: inherit; padding: 0.45rem 0.6rem; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--bg); color: var(--fg);
}
.field textarea { min-height: 6rem; resize: vertical; }
.field .hint { color: var(--fg-muted); font-size: 0.8rem; }
.field.error input, .field.error textarea, .field.error select { border-color: #cf222e; }
.field .error-msg { color: #cf222e; font-size: 0.85rem; }
.submit-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.submit-preview {
  background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; margin-top: 1rem;
}
.submit-preview pre { margin: 0; max-height: 480px; overflow: auto; }

/* ============================================================== Misc */
nowrap { white-space: nowrap; }