/* UK Public Finances Explorer — calm, civic, readable.
   Mobile first; min-width media queries scale up. WCAG 2.2 AA target:
   semantic structure, 4.5:1 text contrast, visible focus, 44px touch targets. */

:root {
  --ink: #1a2230;
  --ink-soft: #46505f;
  --paper: #f7f8fa;
  --card: #ffffff;
  --line: #d8dde4;
  --brand: #1d4e6b;       /* calm civic teal-blue */
  --brand-deep: #123a51;
  --accent: #5a6b3b;      /* muted olive for the chart line */
  --warn-bg: #fdf6e3;
  --warn-line: #c99a06;
  --focus: #b8860b;

  /* confidence badges — muted, never alarmist */
  --c-official: #2f5d3a;
  --c-provisional: #6b5a1e;
  --c-estimated: #4a4f5a;
  --c-calculated: #3a5566;

  --radius: 8px;
  --wrap: 64rem;
  --gap: 1rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font: 400 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

h1, h2, h3 { line-height: 1.2; color: var(--brand-deep); }
h1 { font-size: clamp(1.7rem, 5vw, 2.4rem); }
h2 { font-size: clamp(1.3rem, 3.5vw, 1.7rem); margin-top: 2.5rem; }
h3 { font-size: 1.15rem; }

a { color: var(--brand); }
a:hover { color: var(--brand-deep); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.wrap { width: min(100% - 2rem, var(--wrap)); margin-inline: auto; }

.visually-hidden, .skip-link {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); overflow: hidden;
}
.skip-link:focus {
  position: fixed; top: 0.5rem; left: 0.5rem;
  width: auto; height: auto; clip: auto;
  padding: 0.6rem 1rem; background: var(--card); z-index: 100;
  border-radius: var(--radius); box-shadow: 0 2px 8px rgba(0,0,0,.2);
}

/* Header / nav */
.site-header { background: var(--brand-deep); color: #fff; }
.site-header__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem; padding-block: 0.75rem; }
.site-header__brand { color: #fff; font-weight: 700; text-decoration: none; font-size: 1.1rem; }
.site-header a { color: #fff; }

.site-nav__toggle {
  display: inline-block;
  min-height: 44px; padding: 0.4rem 0.9rem;
  background: transparent; color: #fff;
  border: 1px solid rgba(255,255,255,.6); border-radius: var(--radius);
  font: inherit; cursor: pointer;
}
.site-nav__list {
  list-style: none; margin: 0; padding: 0;
  display: none; width: 100%;
}
.site-nav__list.is-open { display: block; }
.site-nav__list li { border-top: 1px solid rgba(255,255,255,.15); }
.site-nav__list a {
  display: block; min-height: 44px;
  padding: 0.7rem 0.25rem; text-decoration: none;
}
.site-nav__list a[aria-current="page"] { font-weight: 700; text-decoration: underline; }

@media (min-width: 48rem) {
  .site-nav__toggle { display: none; }
  .site-nav__list { display: flex !important; width: auto; gap: 0.25rem; flex-wrap: wrap; }
  .site-nav__list li { border-top: 0; }
  .site-nav__list a { padding: 0.4rem 0.7rem; border-radius: var(--radius); }
  .site-nav__list a:hover { background: rgba(255,255,255,.12); }
}

/* Layout blocks */
main { padding-block: 1.5rem 3rem; }
.page-intro { margin-bottom: 1.5rem; }
.lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 60ch; }
.updated, .muted { color: var(--ink-soft); }
.muted { font-size: 0.9rem; }
.prose { max-width: 70ch; }
.prose p, .prose li { color: var(--ink); }

/* Metric grid + cards */
.metric-grid {
  display: grid; gap: var(--gap);
  grid-template-columns: 1fr;
}
@media (min-width: 38rem) { .metric-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 60rem) { .metric-grid { grid-template-columns: repeat(3, 1fr); } }
.metric-grid--compact { gap: 0.75rem; }

.metric-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.1rem;
}
.metric-card__label { margin: 0 0 0.4rem; font-size: 0.95rem; color: var(--ink-soft); font-weight: 600; }
.metric-card__value { margin: 0 0 0.5rem; font-size: clamp(1.5rem, 4vw, 2rem); font-weight: 700; color: var(--brand-deep); }
.metric-card__explain { margin: 0 0 0.5rem; font-size: 0.95rem; }
.metric-card__more { margin-bottom: 0.5rem; }
.metric-card__more summary { cursor: pointer; color: var(--brand); font-size: 0.9rem; min-height: 44px; display: flex; align-items: center; }
.metric-card--mini { padding: 0.9rem; }
.metric-card--mini .metric-card__value { font-size: 1.4rem; margin-bottom: 0.2rem; }
.metric-card--mini .metric-card__label { margin: 0; }

/* Source note + badges */
.source-note { font-size: 0.82rem; color: var(--ink-soft); margin: 0.5rem 0 0; }
.badge {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-size: 0.72rem; font-weight: 600; text-transform: capitalize;
  padding: 0.1rem 0.5rem; border-radius: 999px;
  background: #eef1f4; color: var(--c-estimated);
}
.badge__dot { width: 0.5rem; height: 0.5rem; border-radius: 50%; background: currentColor; }
.badge--official { color: var(--c-official); background: #e7f0e9; }
.badge--provisional { color: var(--c-provisional); background: #f4efdc; }
.badge--estimated { color: var(--c-estimated); background: #eceef1; }
.badge--calculated { color: var(--c-calculated); background: #e6eef2; }

/* Caveat */
.caveat {
  background: var(--warn-bg); border: 1px solid var(--warn-line);
  border-left-width: 5px; border-radius: var(--radius);
  padding: 1rem 1.1rem; margin: 1.5rem 0; max-width: 70ch;
}
.caveat__heading { margin: 0 0 0.3rem; font-weight: 700; }
.caveat p { margin: 0.3rem 0; }

/* Card links */
.card-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.75rem; }
@media (min-width: 38rem) { .card-links { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 60rem) { .card-links { grid-template-columns: repeat(3, 1fr); } }
.card-links a {
  display: block; min-height: 44px; padding: 1rem;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); text-decoration: none; color: var(--ink);
}
.card-links a:hover { border-color: var(--brand); }
.card-links strong { display: block; color: var(--brand-deep); }
.card-links span { font-size: 0.9rem; color: var(--ink-soft); }

/* Forms */
.field { margin-bottom: 1rem; }
.field label { display: block; font-weight: 600; margin-bottom: 0.3rem; }
.field--inline { display: flex; align-items: center; gap: 0.5rem; }
.field--inline label { margin: 0; }
input[type="number"], select {
  font: inherit; min-height: 44px; padding: 0.5rem 0.7rem;
  border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--ink);
  max-width: 16rem; width: 100%;
}
.field__hint { font-size: 0.85rem; color: var(--ink-soft); margin: 0.3rem 0 0; }
.field__error { color: #8a2b1f; font-weight: 600; margin: 0.3rem 0 0; }
.input-group { display: flex; align-items: stretch; max-width: 18rem; }
.input-group__prefix, .input-group__suffix {
  display: flex; align-items: center; padding: 0 0.6rem;
  background: #eef1f4; border: 1px solid var(--line);
}
.input-group__prefix { border-right: 0; border-radius: var(--radius) 0 0 var(--radius); }
.input-group__suffix { border-left: 0; border-radius: 0 var(--radius) var(--radius) 0; }
.input-group input { border-radius: 0; max-width: none; }

.translator { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem; margin-bottom: 1.5rem; }

.btn {
  display: inline-block; min-height: 44px; padding: 0.6rem 1.2rem;
  font: inherit; font-weight: 600; cursor: pointer;
  color: #fff; background: var(--brand); border: 1px solid var(--brand-deep);
  border-radius: var(--radius);
}
.btn:hover { background: var(--brand-deep); }

/* Radio / chart controls */
.chart-controls { display: grid; gap: 1rem; margin-bottom: 1rem; }
@media (min-width: 48rem) { .chart-controls { grid-template-columns: 2fr 1fr; align-items: end; } }
.chart-controls fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: 0.6rem 0.9rem; margin: 0; }
.chart-controls legend { font-weight: 600; padding: 0 0.3rem; }
.radio-row { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; }
.radio-row label { display: inline-flex; align-items: center; gap: 0.35rem; min-height: 44px; }

/* Chart */
.chart { margin: 0 0 1.5rem; }
.chart__canvas { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.5rem; overflow-x: auto; }
.chart__svg { width: 100%; height: auto; display: block; }
.chart__caption { font-size: 0.9rem; color: var(--ink-soft); margin-top: 0.5rem; }
.chart__empty { padding: 2rem 1rem; text-align: center; color: var(--ink-soft); }
.chart__grid { stroke: #e8ebef; stroke-width: 1; }
.chart__axis-label { fill: var(--ink-soft); font-size: 11px; }
.chart__line { stroke: var(--accent); stroke-width: 2.5; }
.chart__dot { fill: var(--accent); }
.chart__event { stroke: #b9a06a; stroke-width: 1; stroke-dasharray: 3 3; }
.chart__event-label { fill: #8a7330; font-size: 10px; }

/* Tables */
.data-table-wrap { margin: 1.5rem 0; }
.data-table-wrap > summary { cursor: pointer; font-weight: 600; min-height: 44px; display: flex; align-items: center; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.data-table caption { text-align: left; color: var(--ink-soft); font-size: 0.85rem; margin-bottom: 0.4rem; }
.data-table th, .data-table td { padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--line); text-align: left; }
.data-table thead th { border-bottom: 2px solid var(--line); }
.data-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.data-table tbody tr:hover { background: #f0f3f6; }

/* Events */
.event-list { list-style: none; margin: 0; padding: 0; }
.event-list__item { display: flex; gap: 0.75rem; padding: 0.6rem 0; border-bottom: 1px solid var(--line); }
.event-list__year { font-weight: 700; color: var(--brand); min-width: 3rem; }
.pm-list { list-style: none; margin: 0; padding: 0; }
.pm-list li { padding: 0.3rem 0; border-bottom: 1px solid var(--line); }

/* Definition lists */
.def-list dt, .glossary-term__name { font-weight: 700; color: var(--brand-deep); margin-top: 0.8rem; }
.def-list dd, .glossary-term__def { margin: 0.2rem 0 0; }
.glossary { max-width: 70ch; }
.glossary-term { padding: 0.6rem 0; border-bottom: 1px solid var(--line); }

/* Two-column panels (analogy) */
.two-col { display: grid; gap: 1rem; }
@media (min-width: 44rem) { .two-col { grid-template-columns: 1fr 1fr; } }
.panel { border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; background: var(--card); }
.panel--ok { border-left: 5px solid var(--c-official); }
.panel--break { border-left: 5px solid var(--warn-line); }
.panel h3 { margin-top: 0; }

/* Source cards */
.source-grid { display: grid; gap: 1rem; }
@media (min-width: 44rem) { .source-grid { grid-template-columns: 1fr 1fr; } }
.source-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem; }
.source-card__name { margin: 0 0 0.2rem; font-size: 1.1rem; }
.source-card__publisher { margin: 0 0 0.6rem; color: var(--ink-soft); font-size: 0.9rem; }
.source-card__meta { font-size: 0.85rem; color: var(--ink-soft); }

/* Footer */
.site-footer { background: #eef1f4; border-top: 1px solid var(--line); margin-top: 3rem; padding-block: 1.5rem; font-size: 0.9rem; color: var(--ink-soft); }
.site-footer__warn { color: #6b5a1e; }

.see-also { margin-top: 2rem; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---- Interest / Health / International / Simulator additions ---- */

/* Highlighted table row + small tag (international comparison) */
.data-table tr.is-highlight { background: #e6eef2; }
.data-table tr.is-highlight th { font-weight: 700; }
.tag {
  display: inline-block; font-size: 0.7rem; font-weight: 700;
  background: var(--brand); color: #fff; padding: 0.05rem 0.4rem;
  border-radius: 4px; vertical-align: middle;
}

/* Indicator grid + status markers (health dashboard) */
.indicator-grid { display: grid; gap: var(--gap); grid-template-columns: 1fr; }
@media (min-width: 38rem) { .indicator-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 60rem) { .indicator-grid { grid-template-columns: repeat(3, 1fr); } }
.indicator { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem; }
.indicator__head { display: flex; align-items: baseline; justify-content: space-between; gap: 0.5rem; flex-wrap: wrap; }
.indicator__name { margin: 0; font-size: 1rem; color: var(--ink-soft); }
.indicator__value { margin: 0.4rem 0; font-size: 1.6rem; font-weight: 700; color: var(--brand-deep); }
.indicator__unit { font-size: 0.9rem; font-weight: 400; color: var(--ink-soft); }
.indicator__explain { margin: 0 0 0.5rem; font-size: 0.9rem; }
.status {
  font-size: 0.75rem; font-weight: 600; text-transform: capitalize;
  padding: 0.1rem 0.5rem; border-radius: 999px; background: #eceef1; color: var(--ink-soft);
  white-space: nowrap;
}
/* Neutral, non-alarmist — direction shown by arrow, not by red/green */
.status--rising { background: #eef1f4; color: #3a4a5a; }
.status--falling { background: #eef1f4; color: #3a4a5a; }
.status--stable { background: #eef1f4; color: #3a4a5a; }

/* Budget simulator */
.simulator { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem; margin-bottom: 1.5rem; }
.simulator__group { border: 1px solid var(--line); border-radius: var(--radius); padding: 0.8rem 1rem; margin: 0 0 1rem; }
.simulator__group legend { font-weight: 700; padding: 0 0.3rem; }
.slider { display: grid; grid-template-columns: 1fr; gap: 0.2rem; margin-bottom: 0.9rem; }
@media (min-width: 34rem) { .slider { grid-template-columns: 8rem 1fr 6rem; align-items: center; gap: 0.75rem; } }
.slider label { font-weight: 600; }
.slider input[type="range"] { width: 100%; min-height: 44px; accent-color: var(--brand); }
.slider output { font-variant-numeric: tabular-nums; font-weight: 600; color: var(--brand-deep); text-align: left; }
@media (min-width: 34rem) { .slider output { text-align: right; } }
.simulator__results { margin-bottom: 1.5rem; }
.btn--ghost { background: transparent; color: var(--brand); border-color: var(--brand); }
.btn--ghost:hover { background: var(--brand); color: #fff; }

/* ---- UX review fixes: nav groups, scrollable tables, carets, feature card ---- */

/* Grouped navigation via native <details> (disclosure pattern) */
.nav-group summary {
  display: flex; align-items: center; gap: 0.3rem;
  min-height: 44px; padding: 0.7rem 0.25rem; cursor: pointer;
  color: #fff; list-style: none;
}
.nav-group summary::-webkit-details-marker { display: none; }
.nav-group summary::after { content: "▾"; font-size: 0.7em; opacity: 0.85; }
.nav-group[open] summary::after { content: "▴"; }
.nav-group__menu { list-style: none; margin: 0; padding: 0 0 0.3rem 1rem; }
.nav-group.is-active > summary { font-weight: 700; text-decoration: underline; }
.site-nav__list a[aria-current="page"] { font-weight: 700; text-decoration: underline; }

@media (min-width: 48rem) {
  .site-nav__group { position: relative; }
  .nav-group summary { min-height: auto; padding: 0.4rem 0.7rem; border-radius: var(--radius); }
  .nav-group summary:hover { background: rgba(255, 255, 255, 0.12); }
  .nav-group__menu {
    position: absolute; top: 100%; left: 0; z-index: 60;
    min-width: 14rem; padding: 0.3rem;
    background: var(--brand-deep);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.28);
  }
  .nav-group__menu a { white-space: nowrap; border-radius: 4px; }
}

/* Horizontally scrollable table regions (keyboard-focusable) */
.table-scroll { overflow-x: auto; }
.table-scroll:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.data-table-wrap { overflow-x: auto; }

/* Featured headline metric (net debt) — more prominent, balances the grid */
@media (min-width: 38rem) {
  .metric-card--feature { grid-column: 1 / -1; }
}
@media (min-width: 60rem) {
  .metric-card--feature { grid-column: span 2; }
}
.metric-card--feature .metric-card__value { font-size: clamp(2rem, 5vw, 2.7rem); }

/* Expander affordance — a caret that turns on open */
.metric-card__more summary,
.data-table-wrap > summary { list-style: none; }
.metric-card__more summary::-webkit-details-marker,
.data-table-wrap > summary::-webkit-details-marker { display: none; }
.metric-card__more summary::before,
.data-table-wrap > summary::before {
  content: "\25B8"; display: inline-block; margin-right: 0.4rem;
  color: var(--brand); transition: transform 0.15s ease;
}
.metric-card__more[open] summary::before,
.data-table-wrap[open] > summary::before { transform: rotate(90deg); }

/* Health status arrow — a touch more prominent (colour stays neutral) */
.status__arrow { font-weight: 700; font-size: 1.05em; }

/* Slider range hint (budget simulator) */
.slider__range { font-weight: 400; color: var(--ink-soft); font-size: 0.8rem; }