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

:root {
  --text: #0b0c0c;
  --link: #1d70b8;
  --link-hover: #003078;
  --border: #b1b4b6;
  --muted: #505a5f;
  --bg: #ffffff;
  --bg-grey: #f3f2f1;
  --focus: #ffdd00;
  --black: #0b0c0c;
  --blue: #1d70b8;
  --subheader-h: 80px;
}

html {
  overflow-y: scroll;
}

html, body {
  font-family: "GDS Transport", arial, sans-serif;
  font-size: 19px;
  line-height: 1.47;
  color: var(--text);
  background: var(--bg-grey);
  -webkit-font-smoothing: antialiased;
}

body { display: flex; flex-direction: column; min-height: 100vh; }

/* ── header ── */
.govuk-header { background: var(--black); border-bottom: 10px solid var(--blue); flex-shrink: 0; }
.govuk-header__container { max-width: 1200px; margin: 0 auto; padding: 10px 30px; }
.govuk-header__logotype { font-size: 18px; font-weight: 700; color: #ffffff; }

/* ── sticky subheader ── */
.app-subheader {
  background: white;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.app-subheader__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 30px;
  display: flex;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
}

.subheader-field { display: flex; flex-direction: column; gap: 4px; }
.subheader-label { font-size: 16px; font-weight: 700; color: var(--text); }

.subheader-field select,
.subheader-field input[type=search] {
  padding: 5px 8px;
  border: 2px solid var(--black);
  border-radius: 0;
  font-size: 16px;
  font-family: "GDS Transport", arial, sans-serif;
  background: white;
  color: var(--text);
}
.subheader-field select { min-width: 200px; }
.subheader-field input[type=search] { width: 300px; }

.subheader-field select:focus,
.subheader-field input[type=search]:focus {
  outline: 3px solid var(--focus);
  outline-offset: 0;
  box-shadow: inset 0 0 0 2px var(--black);
}

/* filter chips */
.filter-chips { display: flex; gap: 8px; align-items: center; padding-bottom: 2px; flex-wrap: wrap; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 16px;
  padding: 5px 12px;
  border: 2px solid var(--black);
  background: white;
  cursor: pointer;
  user-select: none;
  line-height: 1;
}
.chip:hover { background: var(--bg-grey); }
.chip input[type=checkbox] {
  width: 18px;
  height: 18px;
  accent-color: var(--blue);
  cursor: pointer;
  margin: 0;
  flex-shrink: 0;
}
.chip input[type=checkbox]:focus { outline: 3px solid var(--focus); outline-offset: 2px; }

/* ── page layout ── */
.govuk-width-container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 30px; }
.govuk-main-wrapper { padding: 30px 0; }

.finder-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  align-items: start;
  gap: 30px;
}

/* ── result panel (sticky scrollable list) ── */
#result-panel {
  position: sticky;
  top: var(--subheader-h);
  height: calc(100vh - var(--subheader-h));
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-gutter: stable;
  background: white;
  border: 1px solid var(--border);
}

#detail-panel {
  min-width: 0;
  overflow-x: hidden;
  background: white;
  border: 1px solid var(--border);
  min-height: calc(100vh - var(--subheader-h) - 60px);
}

.result-panel-header {
  padding: 10px 15px;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
  color: var(--muted);
  background: var(--bg-grey);
  position: sticky;
  top: 0;
  z-index: 1;
}

#tree { }

.tree-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 15px;
  cursor: pointer;
  border-left: 4px solid transparent;
  border-bottom: 1px solid var(--border);
  line-height: 1.4;
  gap: 8px;
  font-size: 15px;
}
.tree-item:hover { background: #f0f4f9; }
.tree-item.selected { background: #d2e2f1; border-left-color: var(--blue); }
.tree-item .item-name { flex: 1; word-break: break-word; color: var(--link); }
.tree-item.selected .item-name { font-weight: 700; }
.tree-item .badge { flex-shrink: 0; }

/* ── detail panel ── */
#detail-content { padding: 30px; }

.placeholder { color: var(--muted); padding-top: 20px; font-size: 16px; }

/* GOV.UK tags */
.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 0;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}
.badge-entity   { background: #d2e2f1; color: #144e81; }
.badge-enum     { background: #cce2d8; color: #005a30; }
.badge-select   { background: #fcd6c3; color: #6e3619; }
.badge-defined  { background: #eeefef; color: #383f43; }
.badge-abstract { background: #fcd6c3; color: #942514; }
.badge-function { background: #ebe4f5; color: #3d2375; }
.badge-pset     { background: #cce2d8; color: #005a30; }

/* detail header */
.detail-header { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.detail-header h1 { font-size: 36px; line-height: 1.11; font-weight: 700; }
@media (max-width: 640px) { .detail-header h1 { font-size: 27px; } }

.detail-subheader { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
.ext-links { display: flex; gap: 8px; margin-left: auto; }
.ext-links a {
  font-size: 14px;
  color: var(--link);
  text-decoration: underline;
  padding: 4px 10px;
  border: 2px solid var(--link);
}
.ext-links a:hover { color: var(--link-hover); border-color: var(--link-hover); background: #d2e2f1; }
.ext-links a:focus { outline: 3px solid var(--focus); outline-offset: 0; }

/* breadcrumb */
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; font-size: 16px; color: var(--muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--link); text-decoration: underline; }
.breadcrumb a:hover { color: var(--link-hover); }
.breadcrumb a:focus { outline: 3px solid var(--focus); outline-offset: 0; }
.breadcrumb .sep { color: var(--border); padding: 0 2px; }
.breadcrumb .current { color: var(--text); font-weight: 700; }

/* section headers — govuk-heading-s */
.section-header {
  font-size: 19px;
  line-height: 1.31;
  font-weight: 700;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
  margin-top: 30px;
  margin-bottom: 15px;
}

/* subtypes */
.subtype-list { display: flex; flex-wrap: wrap; gap: 6px; }
.subtype-list a { color: var(--link); text-decoration: underline; font-size: 16px; padding: 3px 10px; background: #d2e2f1; }
.subtype-list a:hover { color: var(--link-hover); background: #b5d0e8; }

/* GOV.UK inset text */
.govuk-inset-text {
  border-left: 5px solid var(--border);
  padding: 15px;
  margin: 20px 0;
  font-size: 19px;
  line-height: 1.47;
}

/* attributes table */
table { width: 100%; border-collapse: collapse; font-size: 16px; }
th {
  text-align: left;
  padding: 10px 20px 10px 0;
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
  border-top: 1px solid var(--border);
  border-bottom: none;
}
td { padding: 10px 20px 10px 0; border-top: 1px solid var(--border); border-bottom: none; vertical-align: top; }
td.opt { color: var(--muted); }
td.type-cell a { color: var(--link); text-decoration: underline; }
td.type-cell a:hover { color: var(--link-hover); }
td.type-cell { font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace; font-size: 14px; }
.pset-prop-name { white-space: nowrap; }
.pset-prop-desc { font-size: 16px; color: var(--muted); }

/* inherited attrs */
details { margin-top: 15px; }
summary { cursor: pointer; font-size: 16px; color: var(--link); padding: 4px 0; user-select: none; text-decoration: underline; }
summary:hover { color: var(--link-hover); }
details[open] summary { margin-bottom: 10px; }
.inherited-group { margin-bottom: 18px; }
.inherited-group .from-label { font-size: 16px; color: var(--text); margin-bottom: 8px; font-weight: 700; }

/* rule lists */
.rule-list { display: grid; gap: 0; }
.rule-item { display: flex; flex-direction: column; gap: 5px; margin-bottom: 15px; }
.rule-name { font-weight: 700; color: var(--text); font-size: 16px; }
pre.rule-expr {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 14px;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--bg-grey);
  border-left: 5px solid var(--border);
  padding: 10px 15px;
  margin: 0;
  display: block;
}

/* enum values */
.enum-values { display: flex; flex-wrap: wrap; gap: 6px; }
.enum-val { font-size: 14px; font-family: monospace; background: var(--bg-grey); padding: 2px 8px; color: var(--text); border: 1px solid var(--border); }

/* select members */
.select-members { display: flex; flex-direction: column; gap: 6px; }
.select-members a { color: var(--link); text-decoration: underline; font-size: 16px; }
.select-members a:hover { color: var(--link-hover); }
.select-members span { color: var(--muted); font-size: 16px; }

/* defined type base */
.defined-base { font-family: monospace; font-size: 16px; color: var(--text); }

/* empty / placeholder */
.empty-note { color: var(--muted); font-size: 16px; font-style: italic; }

/* global link focus */
a:focus { outline: 3px solid var(--focus); outline-offset: 0; }