:root {
    --width: 36;
    --rounding: 4px;
    --table-width: 316px;
    --accent: #696;
    /*--background: #eee;
    --content-background: #fff;
    --content-text: #000;
    --heading-background: #aaa;
    --heading-text: #fff;
    --selected-background: #fffc;
    --help-background: #aaa;
    --help-text: #fff; */
    --graph-line: #bbb;
    --graph-highlight: #0001;
    --key-line: #999;
    --unit-opacity: 0.4;
    --table-stripe: #f8f8f8;
  }
  
  @media (prefers-color-scheme:dark) {
    :root {
      /*--background: #000;
      --content-background: #222;
      --content-text: #eee;
      --heading-background: #444
      --selected-background: #222c;
      --help-background: #888;
      --help-text: #000; ;*/
      --graph-line: #444;
      --graph-highlight: #fff1;
      --key-line: #666;
      --unit-opacity: 0.6;
      --table-stripe: #181818;
    }
  }
  
  @font-face {
    font-family: 'Proza';
    font-weight: 300;
    src: url('proza-light.woff2') format('woff2');
  }
  
  @font-face {
    font-family: 'Proza';
    font-weight: 400;
    src: url('proza-regular.woff2') format('woff2');
  }
  
  *,
  ::before,
  ::after {
    box-sizing: border-box;
  }
  
  html {
    height: 100%;
    font-family: Proza,sans-serif;
    font-weight: 300;
    font-size: clamp(18px, calc(100vw / var(--width)), 20px);
    font-feature-settings: 'tnum';
    line-height: 1.5;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
  }
  
  body {
    display: grid;
    grid-template-rows: max-content 1fr max-content;
    height: 100%;
    margin: 0;
    background: var(--background);
    color: var(--content-text);
  }
  
  header {
    padding: 1.25rem 0 0;
  }
  
  header nav {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    grid-auto-flow: dense;
    gap: 0.25rem;
    align-items: center;
  }
  
  header nav > a {
    grid-column: 2;
    display: grid;
    place-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: var(--content-text);
    transition: background-color 0.2s;
  }
  
  header nav > a:hover {
    background: var(--accent);
  }
  
  header nav svg {
    height: 1.6rem;
    fill: var(--content-background);
  }
  
  header nav div,
  footer nav {
    display: grid;
    grid-auto-flow: column;
    justify-content: center;
  }
  
  header nav div {
    justify-content: right;
  }
  
  header nav div + div {
    justify-content: left;
  }
  
  nav a {
    display: block;
    position: relative;
    padding: 0.2rem 0.75rem 0.3rem;
    border-radius: 1rem;
    color: inherit;
    font-weight: 400;
    font-variant: small-caps;
    text-transform: lowercase;
    text-decoration: none;
    transition: color 0.2s;
  }
  
  nav a.section,
  nav a:hover {
    color: var(--accent);
  }
  
  nav a + a::after {
    content: '';
    display: block;
    position: absolute;
    top: 0.85rem;
    left: -0.175rem;
    width: 0.35rem;
    height: 0.35rem;
    border-radius: 50%;
    background: var(--accent);
  }
  
  footer {
    padding: 1rem 0 1.5rem;
    text-align: center;
  }
  
  footer div {
    padding: 1rem 1.25rem 0.25rem;
  }
  
  footer span {
    white-space: nowrap;
  }
  
  main {
    display: grid;
    gap: 1rem;
    justify-content: center;
    /*padding: 1rem;*/
    font-size: 16px;
    line-height: 1.25;
  }
  
  main > * {
    max-width: 1280px;
  }
  
  section {
    box-sizing: border-box;
    padding: 1rem;
    border-radius: var(--rounding);
    background: var(--content-background);
    color: var(--content-text);
  }
  
  h1 {
    margin: 0 0 0.5rem;
    font-size: 2rem;
    font-weight: 400;
    line-height: 1.1;
  }
  
  h2 {
    font-size: 1.1rem;
    font-weight: 400;
    line-height: 1;
  }
  
  main h2 {
    margin: -1rem -1rem 1rem;
    padding: 0.75rem 1rem;
    border-radius: var(--rounding) var(--rounding) 0 0;
    background: var(--heading-background);
    color: var(--heading-text);
  }
  
  h3 {
    margin: 2rem 0 1rem;
    padding: 0;
    font-size: 1rem;
    font-weight: 300;
    text-align: center;
  }
  
  h3:first-of-type {
    margin-top: 0;
  }
  
  p {
    margin: 0;
    font-size: 1rem;
    line-height: 1.5;
  }
  
  p + p {
    margin-top: 1rem;
  }
  
  table {
    border-collapse: collapse;
  }
  
  a {
    color: var(--accent);
    text-decoration-color: transparent;
    text-decoration-thickness: 0.1em;
    text-underline-offset: 0.15em;
    transition: text-decoration-color 0.2s;
  }
  
  a:hover {
    text-decoration-color: var(--accent);
  }
  
  img {
    vertical-align: bottom;
  }
  
  /* colours */
  
  .generation  { color: #aaa; }
  .price       { color: #000; }
  .emissions   { color: #000; }
  .demand      { color: #000; }
  .fossils     { color: #c45; }
  .renewables  { color: #5b5; }
  .others      { color: #27c; }
  .transfers   { color: #aaa; }
  .coal        { color: #a35; }
  .gas         { color: #e94; }
  .solar       { color: #ed0; }
  .wind        { color: #9d5; }
  .hydro       { color: #2cb; }
  .nuclear     { color: #09c; }
  .biomass     { color: #36b; }
  .belgium     { color: #817; }
  .denmark     { color: #c66; }
  .france      { color: #e94; }
  .ireland     { color: #ed0; }
  .netherlands { color: #9d5; }
  .norway      { color: #2cb; }
  .pumped      { color: #09c; }
  .battery     { color: #639; }
  
  @media (prefers-color-scheme:dark) {
    .generation  { color: #888; }
    .price       { color: #eee; }
    .emissions   { color: #eee; }
    .demand      { color: #eee; }
    .transfers   { color: #888; }
  }
  
  /* columns */
  
  .columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
  
  @media screen and (max-width:959px) {
    .columns {
      grid-template-columns: 1fr;
    }
  }
  
  /* introduction */
  
  #introduction {
    text-align: center;
  }
  
  /* status */
  
  #status {
    font-size: 1rem;
  }
  
  dl {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5em;
    align-items: center;
    justify-items: center;
    margin: 0 -1em;
  }
  
  dt,
  dd {
    margin: 0;
    line-height: 1;
    white-space: nowrap;
  }
  
  dt {
    grid-row: 1;
  }
  
  dd {
    grid-row: 2;
    font-size: 1.2em;
  }
  
  dd abbr {
    opacity: var(--unit-opacity);
  }
  
  dt:nth-child(1),
  dd:nth-child(2) {
    grid-column: 1;
  }
  
  dt:nth-child(3),
  dd:nth-child(4) {
    grid-column: 2;
  }
  
  dt:nth-child(5),
  dd:nth-child(6) {
    grid-column: 3;
  }
  
  [data-operator]::before {
    content: '=';
    grid-area: 1 / 1 / 3 / 3;
    font-size: 1.25rem;
  }
  
  [data-operator]::after {
    content: attr(data-operator);
    grid-area: 1 / 2 / 3 / 4;
    font-size: 1.25rem;
  }
  
  /* latest */
  
  #latest {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-areas: "generation fossils transfers" "generation renewables transfers" "generation others storage";
    gap: 1rem;
  }
  
  @media screen and (max-width:1199px) {
    #latest {
      grid-template-columns: 1fr 1fr;
      grid-template-areas: "generation fossils" "generation renewables" "generation others" "transfers storage";
    }
  }
  
  @media screen and (max-width:779px) {
    #latest {
      grid-template-columns: 1fr;
      grid-template-areas: "generation" "fossils" "renewables" "others" "transfers" "storage";
    }
  }
  
  #latest section {
    margin: 0;
  }
  
  #generation {
    grid-area: generation;
  }
  
  #fossils {
    grid-area: fossils;
  }
  
  #renewables {
    grid-area: renewables;
  }
  
  #others {
    grid-area: others;
  }
  
  #transfers {
    grid-area: transfers;
  }
  
  #storage {
    grid-area: storage;
  }
  
  .sources {
    width: 100%;
    margin: 0;
  }
  
  .sources.transfers {
    color: inherit;
  }
  
  .sources td {
    vertical-align: top;
  }
  
  .sources td:nth-child(1) {
    padding: 0 0 1em;
    background: transparent;
  }
  
  .sources td:nth-child(1)::after {
    content: '';
    display: block;
    box-sizing: border-box;
    width: 1em;
    height: 1em;
    margin-top: 2px;
    background: currentcolor;
  }
  
  .sources.transfers td:nth-child(1)::after {
    border: 2px solid;
    background: transparent;
  }
  
  .sources td:nth-child(2) {
    width: 100%;
    padding: 0 0 1em 0.5em;
  }
  
  .sources td:nth-child(3),
  .sources td:nth-child(4) {
    padding: 0 0 1em 0.75em;
    text-align: right;
    white-space: nowrap;
  }
  
  .sources td:nth-child(1),
  .sources td:nth-child(3),
  .sources td:nth-child(4) {
    width: 0;
  }
  
  .sources td:nth-child(3)::after {
    content: 'GW';
    opacity: var(--unit-opacity);
  }
  
  .sources td:nth-child(4)::after {
    content: '%';
    opacity: var(--unit-opacity);
  }
  
  .sources tr:last-child td {
    padding-bottom: 0;
  }
  
  [data-help] {
    display: inline-block;
    width: 1em;
    height: 1em;
    border-radius: 50%;
    background: var(--help-background);
    color: var(--help-text);
    font-weight: 400;
    font-variant: small-caps;
    line-height: 1;
    text-align: center;
    cursor: pointer;
  }
  
  [data-help]:after {
    content: '?';
    position: relative;
    top: -1px;
  }
  
  #fossils h2 {
    background: #c45;
  }
  
  #renewables h2 {
    background: #5b5;
  }
  
  #others h2 {
    background: #27c;
  }
  
  /* tabs */
  
  [role="tablist"] {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    position: sticky;
    top: 0;
    z-index: 1;
    margin: -1rem -1rem 1rem;
  }
  
  [role="tablist"] h2 {
    margin: 0;
    border-radius: 0;
    text-align: center;
    -webkit-user-select: none;
    user-select: none;
  }
  
  [role="tablist"] h2:first-child {
    border-top-left-radius: var(--rounding);
  }
  
  [role="tablist"] h2:last-child {
    border-top-right-radius: var(--rounding);
  }
  
  h2[aria-selected="true"] {
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);
    background: var(--selected-background);
    color: var(--content-text);
  }
  
  h2[aria-selected="false"] {
    cursor: pointer;
  }
  
  @media screen and (max-width:34rem) {
    [role="tablist"] h2 {
      text-transform: capitalize;
    }
  
    [role="tablist"] span {
      display: none;
    }
  }
  
  [role="tabpanel"] {
    display: grid;
    grid-template-columns: 1fr var(--table-width) 1fr;
    grid-template-areas: "pie status demand" "pie equation demand" "pie table demand" "price table generation" "emissions table transfers";
    gap: 1rem 3rem;
  }
  
  [role="tabpanel"]:nth-child(n + 3) {
    display: none;
  }
  
  [role="tabpanel"] > div {
    min-width: 0;
  }
  
  [role="tabpanel"] > :nth-child(1) { grid-area: status; }
  [role="tabpanel"] > :nth-child(2) { grid-area: equation; }
  [role="tabpanel"] > :nth-child(3) { grid-area: pie; }
  [role="tabpanel"] > :nth-child(4) { grid-area: table; }
  [role="tabpanel"] > :nth-child(5) { grid-area: price; }
  [role="tabpanel"] > :nth-child(6) { grid-area: emissions; }
  [role="tabpanel"] > :nth-child(7) { grid-area: demand; }
  [role="tabpanel"] > :nth-child(8) { grid-area: generation; }
  [role="tabpanel"] > :nth-child(9) { grid-area: transfers; }
  
  [role="tabpanel"] > :is(:nth-child(1),:nth-child(2)) {
    padding-bottom: 1rem;
  }
  
  [role="tabpanel"] > :is(:nth-child(1),:nth-child(2),:nth-child(4)) {
    width: 100%;
    max-width: var(--table-width);
    justify-self: center;
  }
  
  [role="tabpanel"] > :nth-child(3) {
    align-self: center;
    justify-self: center;
  }
  
  @media screen and (max-width:1023px) {
    [role="tabpanel"] {
      grid-template-columns: var(--table-width) 1fr;
      grid-template-areas: "pie price" "status emissions" "equation emissions" "table emissions" "table demand" "table generation" "table transfers";
    }
  }
  
  @media screen and (max-width:767px) {
    [role="tabpanel"] {
      grid-template-columns: 1fr;
      grid-template-areas: none;
    }
  
    [role="tabpanel"] > :nth-child(n) {
      grid-area: auto;
    }
  
    [role="tabpanel"] > :is(:nth-child(3),:nth-child(4)) {
      padding-bottom: 1rem;
    }
  }
  
  /* dialogs */
  
  dialog::backdrop {
    background: rgba(0,0,0,0.5);
  }
  
  dialog[open] {
    display: grid;
    grid-template-columns: 1fr 1.5rem;
    grid-template-rows: 1.5rem min-content; /* required to stop Safari stretching the dialog to the viewport height */
    gap: 1rem;
    width: 24rem;
    max-width: calc(100vw - 6rem);
    padding: 1rem;
    border: 0;
    border-radius: var(--rounding);
    background: var(--content-background);
    color: var(--content-text)
  }
  
  dialog h2 {
    margin: 0;
    font-size: 1.5rem;
  }
  
  dialog div {
    grid-area: 2 / 1 / 3 / 3;
    max-height: calc(100vh - 8.5rem);
    max-height: calc(100dvh - 8.5rem);
    overflow: auto;
  }
  
  dialog p + p {
    margin-top: 1rem;
  }
  
  dialog button {
    padding: 0;
    border: 0;
    outline: 0;
    background: transparent;
    cursor: pointer;
  }
  
  dialog button::-moz-focus-inner {
    padding: 0;
    border: 0;
  }
  
  dialog svg {
    display: block;
    width: 1.5rem;
    height: 1.5rem;
  }
  
  dialog path {
    stroke: var(--content-text);
    stroke-width: 4;
  }
  
  /* pie charts */
  
  .pie-chart-container {
    display: grid;
    align-content: center;
    justify-content: center;
    max-width: 330px;
    aspect-ratio: 1;
    margin: 0 auto 1rem;
  }
  
  .pie-chart {
    display: grid;
    max-width: 300px;
    font-size: 16px;
  }
  
  .pie-chart > div,
  .pie-chart > svg {
    grid-row: 1 / 2;
    grid-column: 1 / 2;
  }
  
  .pie-chart > div {
    display: grid;
    justify-items: center;
    align-content: center;
    text-align: center;
  }
  
  .pie-chart > div > div:nth-child(1) {
    padding-top: 1.25em;
  }
  
  .pie-chart > div > div:nth-child(2) {
    display: block;
    width: 33%;
    height: 2px;
    margin: 0.25em 0;
    background: currentcolor;
  }
  
  .pie-chart > svg {
    width: 100%; /* required to stop Safari shrinking the pie chart to the width of the text */
  }
  
  .pie-chart > svg > path {
    fill: currentcolor;
    stroke: var(--content-background);
    stroke-width: 2;
    vector-effect: non-scaling-stroke;
  }
  
  /* graphs */
  
  .graph {
    --graph-height: 250px;
    --axis-width: 40px;
    --axis-height: 64px;
    --axis-gap: 10px;
    --key-padding: 8px;
    display: grid;
    grid-template: auto var(--axis-height) /  var(--axis-width) 1fr;
    gap: calc(var(--axis-gap) - 0.5em) var(--axis-gap);
    position: relative;
    font-size: 12px;
    line-height: 1;
  }
  
  .graph > div {
    display: grid;
    text-align: right;
  }
  
  .graph > :nth-child(1) {
    grid-area: 1 / 1 / 2 / 3;
    grid-template-columns: var(--axis-width) 1fr;
    column-gap: var(--axis-gap);
    align-content: space-between;
  }
  
  .graph > :nth-child(1) > :nth-child(even) {
    margin-top: calc(0.5em - 1px);
    border-top: 1px solid var(--graph-line);
  }
  
  .graph > :nth-child(2) {
    grid-area: 2 / 2 / 3 / 3;
    grid-auto-flow: column;
    justify-content: space-around;
  }
  
  .graph > :nth-child(2) > div {
    writing-mode: vertical-lr;
    transform: rotate(180deg);
  }
  
  .graph svg {
    grid-area: 1 / 2 / 2 / 3;
    width: 100%;
    height: var(--graph-height);
    margin: 0.5em 0;
  }
  
  polyline {
    fill: transparent;
    stroke: currentcolor;
    stroke-width: 2.5;
    vector-effect: non-scaling-stroke;
  }
  
  .graph rect {
    fill: transparent;
  }
  
  .graph rect:hover {
    fill: var(--graph-highlight);
  }
  
  .graph svg + div {
    position: absolute;
    top: calc(var(--graph-height) / 2 + 0.5em);
    width: max-content;
    max-width: calc(100vw / 2 - 4 * var(--key-padding));
    padding: var(--key-padding);
    background: var(--content-background);
    color: var(--content-text);
    border: 1px solid var(--key-line);
    border-radius: var(--rounding);
    text-align: left;
    transform: translateY(-50%);
    pointer-events: none;
  }
  
  .graph svg + div > div {
    margin-bottom: var(--key-padding);
    font-size: 16px;
    font-weight: 400;
    text-align: center;
  }
  
  .graph svg + div td:nth-child(1)::after {
    margin-top: 0;
  }
  
  .graph svg + div td:nth-child(3) {
    white-space: nowrap;
  }
  
  .graph svg + div td:nth-child(3)::after {
    content: none;
  }
  
  .visits-graph {
    margin: 1rem 0;
  }
  
  /* wind milestones */
  
  .wind-milestones {
    margin: 0.75rem auto 0;
    font-size: 1rem;
  }
  
  .wind-milestones tr:nth-child(even){
    background: var(--table-stripe);
    border: solid var(--background);
    border-width: 2px 0;
  }
  
  .wind-milestones th,
  .wind-milestones td {
    padding: 0.25rem 0.5rem;
  }
  
  .wind-milestones th {
    font-weight: 400;
    text-align: left;
  }