/* ==========================================================================
   UK Grid: Live+ - shared stylesheet
   A redesign built on the data/concept of Kate Morley's "National Grid: Live"
   (https://grid.iamkate.com/, https://github.com/KateMorley/grid)
   ========================================================================== */

:root {
  color-scheme: light dark;

  /* Light theme (default) */
  --bg: #f5f6f8;
  --bg-elevated: #ffffff;
  --bg-inset: #eceef2;
  --text: #1a1d23;
  --text-muted: #5b6270;
  --border: #dde1e7;
  --accent: #0a6e5c;
  --accent-contrast: #ffffff;
  --focus-ring: #1d6fe0;

  --fossil: #8a5a3c;
  --renewable: #1f9d5a;
  --other: #6a5acd;
  --interconnector: #d98e04;
  /* Was #2a8fbd - identical to --hydro, making "storage" and "hydro"
     indistinguishable everywhere this variable is used (storage.html's
     hero swatch, every country page's "Other & storage" table row, the
     homepage's Storage row and nav card). Matches assets/data.js's
     LABEL_COLORS "Battery"/"Storage" entry - keep the two in step. */
  --storage: #0e8f7a;
  --solar: #e0a800;
  --wind: #2fa876;
  --wind-offshore: #1f8f63;
  --hydro: #2a8fbd;
  --hydro-reservoir: #1f6f94;
  --gas: #8a5a3c;
  --oil: #5c4b3c;
  --coal: #4a4a4a;
  --nuclear: #6a5acd;
  --biomass: #7a8f3f;

  --shadow: 0 1px 3px rgba(20, 24, 33, 0.08), 0 1px 2px rgba(20, 24, 33, 0.06);
  --radius: 10px;
  --font-body: "Open Sans", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Open Sans", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* Traffic-light band colours (see .stat-band below). Defined as tokens,
     not literal hex on the class rules, because the same five-colour scale
     needs a slightly different shade per theme to clear WCAG AA's 4.5:1
     text-contrast minimum against its own card background - a contrast
     audit found the original literal-hex palette actually failed AA in
     BOTH themes (e.g. band-good's #4fae3a on a white card was only 2.82:1;
     band-verybad's #c0392b on a dark card was only 3.03:1), not just the
     dark theme it was originally designed against. These light-theme
     values are each tuned to ~4.5-5.5:1 against --bg-elevated: #ffffff,
     same hue as before, just deepened enough to read reliably as body text
     rather than a decorative accent. */
  --band-verygood: #1a864d;
  --band-good: #3d862d;
  --band-average: #9e6c00;
  --band-bad: #b85e21;
  --band-verybad: #be382b;
}

[data-theme="dark"] {
  --bg: #14161c;
  --bg-elevated: #1c1f27;
  --bg-inset: #23262f;
  --text: #edeef2;
  --text-muted: #a2a8b6;
  --border: #333846;
  --accent: #35c299;
  --accent-contrast: #08110d;
  --focus-ring: #6fa8ff;

  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 4px 12px rgba(0, 0, 0, 0.3);

  /* Lightened versions of the same five hues, each tuned to ~4.5-5.7:1
     against --bg-elevated: #1c1f27 - see the --band-* comment in :root. */
  --band-verygood: #1f9b59;
  --band-good: #4eac39;
  --band-average: #c68800;
  --band-bad: #d9712a;
  --band-verybad: #d96154;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161c;
    --bg-elevated: #1c1f27;
    --bg-inset: #23262f;
    --text: #edeef2;
    --text-muted: #a2a8b6;
    --border: #333846;
    --accent: #35c299;
    --accent-contrast: #08110d;
    --focus-ring: #6fa8ff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 4px 12px rgba(0, 0, 0, 0.3);

    --band-verygood: #1f9b59;
    --band-good: #4eac39;
    --band-average: #c68800;
    --band-bad: #d9712a;
    --band-verybad: #d96154;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
[id] { scroll-margin-top: 7rem; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.5;
  transition: background-color .15s ease, color .15s ease;
}

img, svg { max-width: 100%; }

a { color: var(--accent); }
a:not(:hover) { text-decoration-thickness: 1px; }
.ext-link__icon { font-size: .85em; opacity: .7; }

/* Skip link */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: .75rem 1.25rem;
  z-index: 1000;
  border-radius: 0 0 8px 0;
  font-weight: 600;
}
.skip-link:focus {
  left: 0;
}

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

/* Layout */
.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Sticky header + nav wrapper */
.site-head {
  position: sticky;
  top: 0;
  z-index: 60;
  box-shadow: var(--shadow);
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: .9rem;
  padding-bottom: .9rem;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  text-decoration: none;
  color: var(--text);
}
.brand__mark {
  width: 32px;
  height: 32px;
  flex: none;
  overflow: visible;
}
.brand__name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -.01em;
}
.brand__name em {
  font-style: normal;
  color: var(--accent);
}
.brand__mark-pulse {
  animation: pulse 2s ease-in-out infinite;
  transform-origin: 24px 4.2px;
}
.brand__tagline {
  font-size: .8rem;
  color: var(--text-muted);
  display: none;
}
@media (min-width: 640px) {
  .brand__tagline { display: inline; }
}

.credit-line {
  font-size: .82rem;
  color: var(--text-muted);
}
.credit-line a { color: inherit; text-decoration-thickness: 1px; }

.header-controls {
  display: flex;
  align-items: center;
  gap: .6rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: .45rem .85rem;
  font: inherit;
  font-size: .85rem;
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle[data-theme-state="light"],
.theme-toggle[data-theme-state="dark"] {
  border-color: var(--accent);
  color: var(--accent);
}

/* Primary nav */
.site-nav {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  gap: .5rem;
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav ul#site-nav-list {
  display: flex;
  align-items: stretch;
  gap: .1rem;
  flex-wrap: wrap;
  flex: 1;
}
.site-nav > .wrap > ul#site-nav-list > li {
  display: flex;
  position: relative;
}
.site-nav a,
.nav-group__toggle {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .7rem .75rem;
  min-height: 44px;
  color: var(--text-muted);
  text-decoration: none;
  font: inherit;
  font-size: .9rem;
  font-weight: 600;
  border: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  background: none;
  cursor: pointer;
}
.site-nav a:hover,
.nav-group__toggle:hover { color: var(--text); }
.site-nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Grouped dropdown items ("Energy types", "Regions", "Prices") */
.nav-group__toggle[data-active="true"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.nav-group__toggle[aria-expanded="true"] {
  color: var(--text);
  background: var(--bg-inset);
  border-radius: 8px 8px 0 0;
}
.nav-group__chevron {
  width: 11px;
  height: 11px;
  flex: none;
  transition: transform .2s ease;
}
.nav-group__toggle[aria-expanded="true"] .nav-group__chevron { transform: rotate(180deg); }

.nav-group__menu {
  display: none;
  list-style: none;
  margin: 0;
  padding: .4rem;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 210px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 0 10px 10px 10px;
  box-shadow: var(--shadow);
  z-index: 70;
}
.nav-group__menu.is-open {
  display: block;
  animation: fadeInUp .16s ease both;
}
.nav-group__menu li { display: block; }
.nav-group__menu a {
  display: block;
  padding: .6rem .7rem;
  min-height: 0;
  border-radius: 6px;
  border-bottom: none;
  color: var(--text);
  font-weight: 500;
  font-size: .88rem;
  white-space: normal;
}
.nav-group__menu a:hover { background: var(--bg-inset); color: var(--accent); }
.nav-group__menu a[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
  background: var(--bg-inset);
}

/* Hamburger toggle (mobile only) */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0 .8rem;
  min-height: 40px;
  font: inherit;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  flex: none;
}
.nav-toggle:hover { border-color: var(--accent); }
.nav-toggle__icon {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}
.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease, top .2s ease;
}
.nav-toggle__icon::before { top: -6px; }
.nav-toggle__icon::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after { top: 0; transform: rotate(-45deg); }

/* ---------- Mobile nav layout ---------- */
@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .site-nav .wrap {
    flex-wrap: wrap;
    padding-top: .5rem;
    padding-bottom: .5rem;
  }
  .site-nav ul#site-nav-list {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    order: 3;
    padding-top: .25rem;
  }
  .site-nav ul#site-nav-list.is-open { display: flex; }
  .site-nav > .wrap > ul#site-nav-list > li { width: 100%; }
  .site-nav a, .nav-group__toggle {
    width: 100%;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    padding: .8rem .25rem;
  }
  .site-nav a[aria-current="page"] { border-bottom: 1px solid var(--border); background: var(--bg-inset); }
  .nav-group__toggle[aria-expanded="true"] { border-radius: 0; background: transparent; }
  .nav-group__menu {
    position: static;
    display: none;
    width: 100%;
    box-shadow: none;
    border: none;
    border-radius: 0;
    background: var(--bg-inset);
    padding: 0 0 .25rem 1rem;
  }
  .nav-group__menu.is-open { display: block; animation: none; }
  .nav-group__menu a { border-bottom: 1px dashed var(--border); border-radius: 0; padding: .75rem .5rem; }
  .nav-group__menu li:last-child a { border-bottom: none; }
}

/* Hero */
.hero {
  padding: 2rem 0 1rem;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin: 0 0 .35rem;
}
.hero p {
  color: var(--text-muted);
  margin: 0;
}

/* Live status strip */
.status-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .75rem;
  margin: 1.5rem 0;
}
@media (min-width: 640px) {
  .status-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 960px) {
  .status-grid { grid-template-columns: repeat(6, 1fr); }
  /* Used on the ENTSO-E country pages that don't show emissions/GB
     interconnection (France, Netherlands, Belgium, Norway, Denmark - see
     pages/france.html etc.) - 4 stat cards rather than the usual 6, so this
     keeps them evenly filling the row instead of leaving empty trailing
     columns. */
  .status-grid--4 { grid-template-columns: repeat(4, 1fr); }
}
.stat {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .85rem 1rem;
  box-shadow: var(--shadow);
  /* Flex column so the sparkline graph always sits flush at the bottom of
     the card, regardless of how tall the label/value/band content above it
     is - without this, a card whose value wraps to two lines (or whose
     traffic-light band wraps) pushed its own graph down further than its
     neighbours', so graphs in the same row landed at different heights. */
  display: flex;
  flex-direction: column;
}
.stat dt {
  font-size: .74rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-muted);
  margin: 0 0 .25rem;
}
.stat dd {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.stat dd small { font-size: .7em; font-weight: 500; color: var(--text-muted); }
/* The UK-time line under "Data as of" (see GridPreview.formatAsOfHtml in
   assets/app.js) - sits on its own row under the local-time line above, so
   it needs a touch of separation that a plain inline <small> wouldn't get. */
.stat dd small.stat-time-uk { display: inline-block; margin-top: .15rem; }
/* "Data as of" stat card while its first live fetch is still in flight -
   the placeholder text is much longer than a normal stat value, so it
   drops to a smaller weight/size and gently pulses to read as "still
   working on it" rather than a finished, static value. Removed the
   moment real data (or an error dash) replaces it. */
.stat dd.is-loading-text {
  font-size: .92rem;
  font-weight: 600;
  color: var(--text-muted);
  animation: pulseText 1.6s ease-in-out infinite;
}
@keyframes pulseText {
  0%, 100% { opacity: .5; }
  50% { opacity: 1; }
}
/* Any live stat value (id="stat-*") flashes briefly whenever its text
   actually changes after a background refresh - see initStatRefreshAnim
   in assets/app.js, which watches these elements and toggles this class
   on change. A quick fade-plus-colour-pulse so an updated figure reads as
   "this just changed" rather than silently swapping under the reader's
   eye. Skipped entirely for users who've asked for reduced motion. */
.stat-refresh-pulse {
  animation: statRefreshPulse .7s ease-out;
}
@keyframes statRefreshPulse {
  0% { opacity: .25; color: var(--accent); }
  100% { opacity: 1; color: inherit; }
}
@media (prefers-reduced-motion: reduce) {
  .stat-refresh-pulse { animation: none; }
}
/* Traffic-light band for price/emissions/demand/generation/transfers stats
   (see GridPreview.carbonBand/priceBand/bandFromRange/transfersBand/
   setStatBand in assets/app.js). A coloured dot plus a short text label -
   never colour alone - so the signal still reads for colour-blind users
   and in either theme.

   .stat-band-slot is a dedicated row, always present as its own sibling
   after <dd> rather than trailing inline after the value text. Reserving
   a fixed min-height here - regardless of whether the .stat-band inside
   it is currently [hidden] - is what actually keeps every band lined up
   at the same height across a row of stat cards: with the band inline
   inside <dd>, its vertical position drifted with however long that
   card's own value+unit text happened to be (e.g. Ireland's "0.22GW"
   transfers figure sat at a different line height than GB's "£135.47
   /MWh" price), so demand/generation's bands landed noticeably out of
   step with price/transfers/emissions' bands in the same row. */
.stat-band-slot {
  min-height: 1.35rem;
  display: flex;
  align-items: center;
  margin-top: .2rem;
}
.stat-band {
  display: inline-flex;
  align-items: center;
  gap: .32em;
  font-size: .68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
}
.stat-band::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: 0 0 auto;
}
.stat-band.band-verygood { color: var(--band-verygood); }
.stat-band.band-verygood::before { background: var(--band-verygood); }
.stat-band.band-good { color: var(--band-good); }
.stat-band.band-good::before { background: var(--band-good); }
.stat-band.band-average { color: var(--band-average); }
.stat-band.band-average::before { background: var(--band-average); }
.stat-band.band-bad { color: var(--band-bad); }
.stat-band.band-bad::before { background: var(--band-bad); }
.stat-band.band-verybad { color: var(--band-verybad); }
.stat-band.band-verybad::before { background: var(--band-verybad); }
.stat { position: relative; overflow: hidden; }
/* A stat this site can never populate for this page - e.g. pages/usa.html's
   wholesale price/emissions, which the EIA simply doesn't publish. Muted
   rather than styled as an error, since nothing is broken - there's just
   no source. Deliberately distinct from is-loading-text (transient) and
   showStatError's error styling (a fetch that should have worked didn't). */
.stat--unavailable dd { color: var(--text-muted); font-weight: 600; font-size: 1.05rem; }
.stat__spark.chart-wrap {
  height: 28px;
  /* auto margin absorbs whatever space is left in the flex column above -
     pins the graph to the card's bottom edge instead of sitting right
     under the value with a fixed gap (see the .stat flex-column comment). */
  margin-top: auto;
  padding-top: .3rem;
  opacity: .85;
}

/* Tabs (time ranges) */
.range-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin: 1.75rem 0 1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.range-tabs [role="tab"] {
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  padding: .55rem .95rem;
  font: inherit;
  font-size: .88rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 8px 8px 0 0;
  margin-bottom: -1px;
}
.range-tabs [role="tab"]:hover { color: var(--text); background: var(--bg-inset); }
.range-tabs [role="tab"][aria-selected="true"] {
  color: var(--accent);
  border-color: var(--border);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--bg-elevated);
}

/* Panels / cards */
.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem 1.4rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
}
.panel h2, .panel h3 {
  margin-top: 0;
}
.panel-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}
@media (min-width: 860px) {
  .panel-grid--2 { grid-template-columns: 1fr 1fr; }
  .panel-grid--3 { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1180px) {
  .panel-grid--3 { grid-template-columns: 1fr 1fr 1fr; }
}

/* Generation mix panel: two full-size donuts side by side under the table */
.chart-grid--donuts { margin-top: 1.5rem; }
.chart-grid--donuts .chart-legend { justify-content: center; }

.chart-wrap {
  position: relative;
  height: 260px;
}
.chart-wrap canvas { width: 100% !important; height: 100% !important; }

.chart-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
  margin-top: 1rem;
}
@media (min-width: 720px) {
  .chart-grid { grid-template-columns: 1fr 1fr; }
}
.chart-card {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .85rem .9rem 1rem;
}
.chart-card h3 {
  margin: 0 0 .5rem;
  font-size: .95rem;
}
.chart-card .chart-wrap { height: 200px; }

.chart-legend {
  list-style: none;
  margin: .6rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .9rem;
  font-size: .82rem;
  color: var(--text-muted);
}
.chart-legend .swatch {
  display: inline-block;
  width: .65rem;
  height: .65rem;
  border-radius: 2px;
  margin-right: .35rem;
}
.chart-legend strong { color: var(--text); font-variant-numeric: tabular-nums; }

/* Toggle switch */
.toggle-row {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin: .25rem 0 1.1rem;
  padding: .4rem;
  margin-left: -.4rem;
  border-radius: 8px;
  font-size: .9rem;
  color: var(--text-muted);
  cursor: pointer;
  min-height: 44px;
}
.toggle-row:hover { background: var(--bg-inset); }
.toggle-row em { color: var(--text-muted); font-style: normal; opacity: .8; }

/* Alerts panel (index.html) - threshold rule rows sharing the .toggle-row
   switch styling above, plus their own select/number-input theming since
   those elements otherwise fall back to unstyled browser defaults that
   clash with the site's dark/light theme. */
.alert-rules { display: flex; flex-direction: column; gap: .2rem; }
.alert-rule select,
.alert-rule input[type="number"] {
  font: inherit;
  font-size: .9rem;
  color: var(--text);
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .25rem .5rem;
  margin: 0 .15rem;
}
.alert-rule input[type="number"] { text-align: right; }
.alert-rule select:focus-visible,
.alert-rule input[type="number"]:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

/* pages/comparisons.html - the pair of dropdowns each comparison tab uses
   to pick what's being compared (two countries, a metric + a prior
   period, or two energy categories). Reuses the alert-rule select's exact
   theming (border, background, focus ring) for visual consistency rather
   than introducing a second select style. */
.compare-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: center;
  margin: 1rem 0 1.25rem;
}
.compare-picker label {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .9rem;
  color: var(--text-muted);
}
.compare-picker select {
  font: inherit;
  font-size: .9rem;
  color: var(--text);
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .35rem .55rem;
}
.compare-picker select:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}
.switch {
  position: relative;
  display: inline-flex;
  cursor: pointer;
  flex: none;
}
.switch input {
  position: absolute;
  opacity: 0;
  width: 42px;
  height: 24px;
  margin: 0;
  cursor: pointer;
}
.switch__track {
  width: 42px;
  height: 24px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 999px;
  display: inline-block;
  position: relative;
  transition: background-color .18s ease, border-color .18s ease;
}
.switch__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: transform .18s ease, background-color .18s ease;
}
.switch input:checked + .switch__track {
  background: var(--accent);
  border-color: var(--accent);
}
.switch input:checked + .switch__track .switch__thumb {
  transform: translateX(18px);
  background: var(--accent-contrast);
}
.switch input:focus-visible + .switch__track {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.chart-caption {
  font-size: .8rem;
  color: var(--text-muted);
  margin-top: .5rem;
}

.period-caption {
  font-size: .85rem;
  color: var(--text-muted);
  background: var(--bg-inset);
  border-radius: 6px;
  padding: .5rem .75rem;
  margin: 0 0 .75rem;
}
.period-caption strong { color: var(--text); }

/* Copy-as-text button */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 999px;
  padding: .35rem .8rem;
  font: inherit;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: .6rem;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn svg { width: 13px; height: 13px; flex: none; }
.copy-btn.is-copied { color: var(--accent); border-color: var(--accent); }
.copy-btn.is-copy-failed { color: #c0392b; border-color: #c0392b; }

.download-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem .7rem;
  margin: 0 0 1rem;
}
.download-row .copy-btn { margin-bottom: 0; }

/* Mix table */
table.mix {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
}
table.mix caption {
  text-align: left;
  font-weight: 700;
  margin-bottom: .5rem;
}
table.mix th, table.mix td {
  text-align: left;
  padding: .4rem .4rem;
  border-bottom: 1px solid var(--border);
}
table.mix th.num, table.mix td.num { text-align: right; font-variant-numeric: tabular-nums; }
table.mix .swatch {
  display: inline-block;
  width: .7rem;
  height: .7rem;
  border-radius: 2px;
  margin-right: .5rem;
}
table.mix tr.group-row { font-weight: 700; }
table.mix tr.group-row td, table.mix tr.group-row th { border-top: 1px solid var(--border); }

/* Energy type cards (index → detail pages) */
.type-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  margin: 1.5rem 0;
}
.type-card {
  display: block;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  border-left: 4px solid var(--accent);
}
.type-card:hover { border-left-color: var(--accent); transform: translateY(-1px); }
.type-card h3 { margin: 0 0 .25rem; font-size: 1.05rem; }
.type-card p { margin: 0; color: var(--text-muted); font-size: .85rem; }
.type-card .type-card__value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  margin: .35rem 0;
  font-variant-numeric: tabular-nums;
}

/* Detail page header badge */
.type-hero {
  display: flex;
  align-items: center;
  gap: .9rem;
  margin-bottom: .5rem;
}
.type-hero__swatch {
  width: 14px; height: 14px; border-radius: 3px; flex: none;
}

/* Records list */
.records-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: .5rem;
}
.records-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .5rem .6rem;
  border-bottom: 1px dashed var(--border);
  font-size: .9rem;
}
.records-list li span:first-child { color: var(--text-muted); }
.records-list li strong { font-variant-numeric: tabular-nums; }

/* Data sources page */
.source-card {
  border-left: 4px solid var(--accent);
  display: flex;
  flex-direction: column;
}
.source-card__head {
  display: flex;
  align-items: center;
  gap: .65rem;
  margin-bottom: .3rem;
}
.source-card__icon {
  flex: none;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: .78rem;
  letter-spacing: .01em;
  background: var(--accent);
  color: var(--accent-contrast);
}
.source-card__head h2 {
  margin: 0;
  font-size: 1.02rem;
}
.source-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: .5rem 0 .7rem;
}
.source-card__meta span {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .03em;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .15rem .55rem;
  color: var(--text-muted);
}
.licence-note {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .85rem 1rem;
  font-size: .88rem;
  margin-top: auto;
}

/* Callout / pointer box (Sources + About pages) */
.callout {
  display: flex;
  align-items: flex-start;
  gap: .7rem;
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-elevated));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: var(--radius);
  padding: .9rem 1.1rem;
  margin: 1.25rem 0;
  font-size: .92rem;
}
.callout__icon {
  flex: none;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-contrast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: .82rem;
}
.callout p {
  margin: 0;
}
.callout a {
  font-weight: 700;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding: 2rem 0 3rem;
  color: var(--text-muted);
  font-size: .88rem;
  background: var(--bg-elevated);
}
.site-footer a { color: var(--text-muted); }
/* Compact data-attribution line shown in every page's footer (not just
   index.html's fuller sitemap footer) - satisfies Elexon's licence
   requirement sitewide rather than only on the homepage, and links through
   to the full statement + methodology on pages/data-sources.html. */
.footer-attribution {
  margin: 0 0 1rem;
}

/* Wraps index.html's sources blurb - was a 2-column grid (sources + a
   sitemap list of every page) before the sitemap column was removed as
   redundant with the main nav; kept as a single-column wrapper purely for
   the top margin below. */
.footer-grid {
  margin-top: 1.5rem;
}

.badge {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .03em;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .15rem .55rem;
  color: var(--text-muted);
}

.preview-banner {
  background: #b8860b;
  color: #1a1200;
  text-align: center;
  font-size: .85rem;
  font-weight: 600;
  padding: .5rem 1rem;
}
.preview-banner a { color: inherit; }

/* Data-pipeline status pill, injected into the footer by initIngestStatusPill()
   in assets/app.js. Reflects api/status.php: whether the last attempt to pull
   data from Elexon/NESO/Carbon Intensity and write it to MySQL succeeded. */
.ingest-status { margin: .9rem 0 0; }
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .3rem .7rem;
  border-radius: 999px;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: .78rem;
  font-weight: 600;
}
.status-pill__dot {
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}
.status-pill[data-status="success"] { color: var(--renewable); border-color: color-mix(in srgb, var(--renewable) 45%, transparent); }
.status-pill[data-status="fail"] { color: #c94a3d; border-color: rgba(201,74,61,.35); }
.status-pill[data-status="error"] { color: #8a8f9c; border-color: var(--border); }
.status-pill[data-status="pending"] { color: #d98e04; border-color: rgba(217,142,4,.35); }
.status-pill[data-status="checking"] .status-pill__dot { opacity: .5; }

/* Toast notifications, injected by showToast() in assets/app.js - used for
   data-pipeline errors and "live data updated" confirmations. */
.toast-container {
  position: fixed;
  z-index: 1000;
  right: 1rem;
  bottom: 1rem;
  left: auto;
  display: flex;
  flex-direction: column-reverse;
  gap: .6rem;
  max-width: min(360px, calc(100vw - 2rem));
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: 4px solid var(--text-muted);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: .7rem .8rem;
  font-size: .85rem;
  line-height: 1.4;
  color: var(--text);
  animation: toast-in .22s ease-out;
}
.toast--success { border-left-color: var(--renewable); }
.toast--error { border-left-color: #c94a3d; }
.toast--info { border-left-color: var(--focus-ring); }
.toast__text { flex: 1; }
.toast__close {
  flex: none;
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 .1rem;
}
.toast__close:hover, .toast__close:focus-visible { color: var(--text); }
.toast.is-leaving { animation: toast-out .18s ease-in forwards; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes toast-out {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(8px); }
}
@media (prefers-reduced-motion: reduce) {
  .toast { animation: none; }
  .toast.is-leaving { animation: none; opacity: 0; }
}
@media (max-width: 560px) {
  .toast-container {
    left: 1rem;
    right: 1rem;
    max-width: none;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- Animation ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.hero h1 { animation: fadeInUp .5s ease both; }
.hero p  { animation: fadeInUp .5s ease .08s both; }

.status-grid .stat {
  animation: fadeInUp .45s ease both;
}
.status-grid .stat:nth-child(1) { animation-delay: .03s; }
.status-grid .stat:nth-child(2) { animation-delay: .08s; }
.status-grid .stat:nth-child(3) { animation-delay: .13s; }
.status-grid .stat:nth-child(4) { animation-delay: .18s; }
.status-grid .stat:nth-child(5) { animation-delay: .23s; }
.status-grid .stat:nth-child(6) { animation-delay: .28s; }

.type-grid .type-card {
  animation: fadeInUp .45s ease both;
}
.type-grid .type-card:nth-child(1) { animation-delay: .05s; }
.type-grid .type-card:nth-child(2) { animation-delay: .1s; }
.type-grid .type-card:nth-child(3) { animation-delay: .15s; }
.type-grid .type-card:nth-child(4) { animation-delay: .2s; }
.type-grid .type-card:nth-child(5) { animation-delay: .25s; }

.type-card, .stat, .theme-toggle, .range-tabs [role="tab"], .metric-switch button {
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease, background-color .18s ease, color .18s ease;
}
.type-card:hover { transform: translateY(-3px); box-shadow: 0 6px 16px rgba(20,24,33,.12); }
.stat:hover { transform: translateY(-2px); }
.theme-toggle:active { transform: scale(.94); }

/* reveal-on-scroll for panels */
.panel, .source-card {
  opacity: 0;
  animation: fadeInUp .5s ease both;
  animation-play-state: paused;
  animation-delay: 0s;
}
.panel.is-visible, .source-card.is-visible {
  animation-play-state: running;
}

/* live "pulse" indicator on the current-time stat */
.stat--live dt::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: .4rem;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(10,110,92,.4); }
  50% { opacity: .55; }
}

/* Page-level "live data unavailable" banner, shown by
   GridPreview.showLiveDataBanner() in assets/app.js when the real backend
   can't be reached - only used on sections that are actually meant to be
   live (see the comment above that function). */
.live-data-banner {
  display: flex;
  align-items: center;
  gap: .6rem;
  background: color-mix(in srgb, #c94a3d 12%, var(--bg-elevated));
  border: 1px solid rgba(201,74,61,.4);
  color: var(--text);
  border-radius: var(--radius);
  padding: .75rem 1rem;
  margin: 1rem 0;
  font-size: .92rem;
  font-weight: 600;
}
.live-data-banner::before {
  content: "!";
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: #c94a3d;
  color: #fff;
  font-size: .85rem;
  font-weight: 800;
}

/* Prominent "as of [time]" / "illustrative data" status pill, shown right
   under a page's hero so it's the first thing a visitor reads - rather
   than being buried mid-sentence inside the longer descriptive caption
   under the status grid. .is-illustrative is the amber variant for pages
   (or sections) that aren't wired to a live source, e.g. pages/usa.html. */
.data-status-banner {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  background: color-mix(in srgb, var(--accent) 12%, var(--bg-elevated));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  color: var(--text);
  border-radius: 999px;
  padding: .45rem 1.05rem;
  margin: 0 0 1.35rem;
  font-size: .88rem;
  font-weight: 700;
}
.data-status-banner .dot {
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
  animation: pulse 2s ease-in-out infinite;
}
.data-status-banner.is-illustrative {
  background: color-mix(in srgb, #d98e04 16%, var(--bg-elevated));
  border-color: rgba(217,142,4,.45);
}
.data-status-banner.is-illustrative .dot {
  background: #d98e04;
  animation: none;
}
/* .is-delayed: genuinely live data, just not real-time (e.g. pages/usa.html
   once its EIA figures are connected - typically ~1 day behind). Same
   amber background as .is-illustrative so it still reads as "not as fresh
   as GB/Ireland", but the dot keeps pulsing (inherits .data-status-banner
   .dot's animation above) rather than going static, since this is live
   data actually flowing rather than no live source at all. */
.data-status-banner.is-delayed {
  background: color-mix(in srgb, #d98e04 16%, var(--bg-elevated));
  border-color: rgba(217,142,4,.45);
}
.data-status-banner.is-delayed .dot {
  background: #d98e04;
}

/* Per-chart "no live data" state - shown instead of a drawn chart. */
.chart-wrap.has-error { background: var(--bg-inset); border-radius: 6px; }
.chart-wrap.has-error canvas { visibility: hidden; }
.chart-error-msg {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin: 0;
  padding: 0 1rem;
  font-size: .82rem;
  color: var(--text-muted);
}

/* skeleton shimmer used while charts mount */
.chart-wrap.is-loading::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, var(--bg-inset), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.1s ease-in-out infinite;
  border-radius: 6px;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.theme-toggle svg { transition: transform .35s ease; }
.theme-toggle[data-theme-active="dark"] svg {
  transform: rotate(180deg);
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .panel, .source-card { opacity: 1; }
}