:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1f242e;
  --line: #2a3039;
  --text: #e7ebf0;
  --muted: #9aa4b2;
  --accent: #4c8dff;
  --accent-soft: #1d2a45;
  --neg: #ff6b6b;
  --neg-soft: #3a1f22;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.25);
  --maxw: 1180px;
  /* transparency checkerboard, anchored to the image it sits behind */
  --checker: repeating-conic-gradient(#2c323b 0 25%, #21262f 0 50%) 0 0 / 20px 20px;
  --checker-sm: repeating-conic-gradient(#2c323b 0 25%, #21262f 0 50%) 0 0 / 13px 13px;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px clamp(14px, 3vw, 28px);
  background: rgba(15,17,21,.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  font-size: 17px;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 26px; height: 17px;
  border-radius: 3px;
  background: url("data/fiav.svg") center / cover no-repeat;
  box-shadow: 0 0 0 1px rgba(255,255,255,.15);
}
.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
#search {
  width: min(340px, 42vw);
  padding: 8px 12px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 14px;
}
#search:focus { outline: none; border-color: var(--accent); }
.header-actions button,
.header-actions a {
  padding: 8px 14px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
}
.header-actions button:hover,
.header-actions a:hover { border-color: var(--accent); text-decoration: none; }

/* ---------- layout ---------- */
main {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(14px, 3vw, 28px);
  flex: 1 0 auto;
}
.loading { color: var(--muted); }

.site-footer {
  flex-shrink: 0;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  padding: 22px 16px 30px;
  border-top: 1px solid var(--line);
  margin-top: 30px;
}

/* ---------- browse view ---------- */
.browse { display: grid; grid-template-columns: 250px 1fr; gap: 26px; align-items: start; }
.filters {
  position: sticky; top: 78px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  max-height: calc(100vh - 100px);
  overflow: auto;
}
.filter-group { margin-bottom: 18px; }
.filter-group:last-child { margin-bottom: 0; }
.filter-group h3 {
  margin: 0 0 9px;
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
}
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 9px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}
.chip:hover { border-color: var(--accent); }
.chip.on { background: var(--accent-soft); border-color: var(--accent); color: #dce8ff; }
.chip .count { color: var(--muted); font-size: 11px; }
.chip.on .count { color: #9db8ee; }
.chip.ex { background: var(--neg-soft); border-color: var(--neg); color: #ffd9d9; }
.chip.ex .count { color: #e3a6a6; }
.chip.ex .chip-label { text-decoration: line-through; text-decoration-thickness: 1.5px; }
.chip.ex::before { content: "\2715"; font-size: 10px; opacity: .85; margin-right: 1px; }
.swatch {
  width: 12px; height: 12px; border-radius: 3px;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.18);
}
.more-toggle {
  margin-top: 8px; background: none; border: none;
  color: var(--accent); cursor: pointer; font-size: 12.5px; padding: 0;
}
.match-mode { font-size: 12px; color: var(--muted); margin-top: 4px; display: flex; align-items: center; gap: 6px; }
.match-mode select { background: var(--panel-2); color: var(--text); border: 1px solid var(--line); border-radius: 6px; padding: 2px 4px; }

.results-bar {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 14px; flex-wrap: wrap;
}
.results-count { font-weight: 600; }
.active-facets { display: flex; flex-wrap: wrap; gap: 6px; }
.facet-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px; background: var(--accent-soft);
  border: 1px solid var(--accent); border-radius: 999px;
  font-size: 12px; color: #dce8ff;
}
.facet-pill button { background: none; border: none; color: inherit; cursor: pointer; font-size: 13px; line-height: 1; padding: 0; }
.facet-pill.neg { background: var(--neg-soft); border-color: var(--neg); color: #ffd9d9; }
.clear-all { margin-left: auto; background: none; border: 1px solid var(--line); color: var(--muted); border-radius: var(--radius); padding: 5px 11px; cursor: pointer; font-size: 13px; }
.clear-all:hover { border-color: var(--accent); color: var(--text); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px;
}
.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform .08s ease, border-color .08s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); text-decoration: none; }
.card .thumb {
  aspect-ratio: 3 / 2;
  background: var(--panel-2);
  display: flex; align-items: center; justify-content: center;
}
.card .thumb img { width: 100%; height: 100%; object-fit: contain; background: var(--checker-sm); }
.card .meta { padding: 8px 10px; }
.card .meta .name { font-size: 13px; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.card .meta .code { font-size: 11px; color: var(--muted); }
.empty { color: var(--muted); padding: 30px 0; }
.load-more { display: block; margin: 22px auto 0; padding: 9px 20px; background: var(--panel-2); border: 1px solid var(--line); color: var(--text); border-radius: var(--radius); cursor: pointer; }
.load-more:hover { border-color: var(--accent); }

/* ---------- detail view ---------- */
.detail-back { display: inline-block; margin-bottom: 16px; color: var(--muted); }
.detail { display: grid; grid-template-columns: minmax(0, 1.1fr) 1fr; gap: 30px; align-items: start; }
.detail-figure {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  position: sticky; top: 78px;
}
.detail-figure img { width: 100%; height: auto; display: block; border-radius: 4px; box-shadow: var(--shadow); background: var(--checker); }
.detail-figure .ratio { text-align: center; color: var(--muted); font-size: 12.5px; margin-top: 12px; }

.detail h1 { margin: 0 0 2px; font-size: 26px; }
.detail .codes-line { color: var(--muted); font-size: 13.5px; margin-bottom: 16px; }
.detail .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.tag { padding: 3px 9px; border-radius: 999px; font-size: 12px; background: var(--panel-2); border: 1px solid var(--line); color: var(--muted); cursor: pointer; }
.tag:hover { border-color: var(--accent); color: var(--text); text-decoration: none; }

.section { margin-bottom: 20px; }
.section h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 0 0 8px; }
.section p { margin: 0 0 8px; }

.color-row { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 8px; }
.color-row .swatch { width: 20px; height: 20px; flex: none; margin-top: 1px; }
.color-row .c-name { font-weight: 600; text-transform: capitalize; }
.color-row .c-sym { color: var(--muted); font-size: 13.5px; }

.feature-item { padding: 9px 0; border-top: 1px solid var(--line); }
.feature-item:first-child { border-top: none; }
.feature-item .f-type { font-weight: 600; }
.feature-item .f-attrs { color: var(--muted); font-size: 12.5px; }
.feature-item .f-sym { color: var(--muted); font-size: 13.5px; margin-top: 3px; }

.periods li { color: var(--muted); }
.sources a { display: block; font-size: 13.5px; word-break: break-all; }

.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 12px; }
.related-card { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; cursor: pointer; }
.related-card:hover { border-color: var(--accent); text-decoration: none; }
.related-card .thumb { aspect-ratio: 3/2; background: var(--panel-2); }
.related-card .thumb img { width: 100%; height: 100%; object-fit: contain; background: var(--checker-sm); }
.related-card .rl { padding: 6px 8px; font-size: 12px; }
.related-card .rl .rl-name { color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.related-card .rl .rl-rel { color: var(--muted); font-size: 11px; }
.rel-block { margin-bottom: 16px; }
.rel-block h3 { font-size: 12.5px; color: var(--muted); margin: 0 0 8px; font-weight: 600; }

.error { color: #ff9a9a; }

/* ---------- about page ---------- */
.about { max-width: 720px; margin: 0 auto; }
.about h1 { font-size: 28px; margin: 6px 0 14px; }
.about h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin: 26px 0 10px;
}
.about p { margin: 0 0 12px; line-height: 1.6; }
.about ul { padding-left: 1.4em; margin: 0 0 12px; }
.about li { margin-bottom: 8px; line-height: 1.55; }
.about code {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 12.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 10px;
  margin: 6px 0 4px;
  padding: 0;
}
.about-stats div {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 12px;
  text-align: center;
}
.about-stats dt { font-size: 26px; font-weight: 650; color: var(--text); }
.about-stats dd { margin: 2px 0 0; font-size: 12px; color: var(--muted); text-transform: lowercase; }

.site-footer .dot { color: var(--line); margin: 0 6px; }
.site-footer a { color: var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .browse { grid-template-columns: 1fr; }
  .filters { position: static; max-height: none; }
  .detail { grid-template-columns: 1fr; }
  .detail-figure { position: static; }
}
@media (max-width: 560px) {
  .header-actions #repo-link { display: none; }
  #search { width: 44vw; }
}