/* Aurora Borealis Norway: polar-night field guide */
:root {
  --snow: #f3f6f8;
  --paper: #ffffff;
  --ink: #14213d;
  --ink-soft: #46536b;
  --fjord: #2f5d7c;
  --frost: #d5dee5;
  --lichen: #3e8e6b;
  --lichen-pale: #dcebe3;
  --measure: 40rem;
  --wide: 62rem;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--snow);
  color: var(--ink);
  font-family: "Schibsted Grotesk", "Helvetica Neue", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.6;
}
a { color: var(--fjord); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--fjord); outline-offset: 3px; }

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 16px; }

/* Header */
header.site { background: var(--ink); color: var(--snow); }
header.site .wrap { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 6px 28px; padding-top: 18px; padding-bottom: 18px; }
.brand { color: var(--snow); text-decoration: none; font-weight: 800; font-size: 19px; letter-spacing: -.2px; }
.brand:hover { color: #fff; }
nav.main { display: flex; flex-wrap: wrap; gap: 4px 20px; font-size: 15px; }
nav.main a { color: #b9c6d6; text-decoration: none; }
nav.main a:hover { color: #fff; }
nav.main a[aria-current] { color: #fff; text-decoration: underline; text-underline-offset: 6px; }

/* Article column */
main { padding-bottom: 24px; }
.page-head, article > *, .faq { max-width: var(--measure); }
article > .table-wrap, article > .season { max-width: none; }
.page-head { padding: 48px 0 8px; }
h1 { font-size: clamp(34px, 6.4vw, 56px); line-height: 1.04; letter-spacing: -1.4px; font-weight: 800; margin: 0 0 18px; }
.lede { font-size: 21px; line-height: 1.5; color: var(--ink-soft); margin: 0 0 16px; }
.meta { font-size: 15px; color: var(--ink-soft); margin: 0; }
.meta a { color: var(--ink-soft); }

h2 { font-size: 28px; line-height: 1.2; letter-spacing: -.5px; font-weight: 800; margin: 56px 0 12px; }
h3 { font-size: 20px; line-height: 1.3; font-weight: 700; margin: 32px 0 6px; }
p, li { color: var(--ink); }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }
.small { font-size: 14px; color: var(--ink-soft); }

/* "In short" summary */
.answer-box { border-left: 4px solid var(--fjord); padding: 2px 0 2px 20px; margin: 36px 0; }
.answer-box h2 { font-size: 17px; letter-spacing: 0; margin: 0 0 6px; color: var(--fjord); }
.answer-box ul { margin: 0; }

.disclosure { font-size: 14px; color: var(--ink-soft); margin: 20px 0 0; }

/* Tables */
.table-wrap { overflow-x: auto; background: var(--paper); border-top: 3px solid var(--ink); margin: 18px 0 8px; }
table { font-variant-numeric: tabular-nums; width: 100%; border-collapse: collapse; font-size: 15.5px; line-height: 1.45; min-width: 680px; }
th, td { text-align: left; vertical-align: top; padding: 13px 14px; border-bottom: 1px solid var(--frost); }
th { font-weight: 700; font-size: 14px; color: var(--ink-soft); }
td strong { font-weight: 700; }

a.btn { display: inline-block; white-space: nowrap; background: var(--ink); color: #fff; font-weight: 600; font-size: 14px; padding: 7px 12px; border-radius: 4px; text-decoration: none; }
a.btn:hover { background: var(--fjord); color: #fff; }

/* Home: season chart */
.season { background: var(--paper); padding: 22px 20px 16px; margin: 8px 0 12px; border-top: 3px solid var(--ink); }
.season h2 { margin: 0 0 4px; font-size: 21px; letter-spacing: -.2px; }
.season p { margin: 0 0 18px; color: var(--ink-soft); font-size: 15px; max-width: var(--measure); }
.bars { display: grid; grid-template-columns: repeat(8, 1fr); gap: 8px; align-items: end; height: 190px; }
.bar { display: flex; flex-direction: column; justify-content: flex-end; height: 100%; }
.bar span { display: block; background: var(--frost); height: calc(var(--h) / 24 * 100%); }
.bar.best span { background: var(--lichen); }
.bar.polar span { background: var(--ink); }
.bar-label { font-variant-numeric: tabular-nums; display: grid; grid-template-columns: repeat(8, 1fr); gap: 8px; margin-top: 8px; font-size: 13px; text-align: center; color: var(--ink-soft); }
.bar-label b { display: block; color: var(--ink); font-weight: 700; }
.key { display: flex; flex-wrap: wrap; gap: 6px 20px; font-size: 13px; color: var(--ink-soft); margin-top: 14px; }
.key i { display: inline-block; width: 11px; height: 11px; margin-right: 6px; vertical-align: -1px; }

/* Home: guide index */
.guides { list-style: none; padding: 0; margin: 12px 0 0; max-width: var(--measure); }
.guides li { margin: 0; border-bottom: 1px solid var(--frost); }
.guides a { display: block; padding: 18px 0; text-decoration: none; color: var(--ink); }
.guides a strong { display: block; font-size: 21px; letter-spacing: -.3px; }
.guides a span { color: var(--ink-soft); font-size: 16px; }
.guides a:hover strong { color: var(--fjord); text-decoration: underline; text-underline-offset: 4px; }

/* FAQ */
.faq details { border-bottom: 1px solid var(--frost); padding: 14px 0; }
.faq summary { cursor: pointer; font-weight: 700; list-style-position: outside; }
.faq details p { margin: 10px 0 2px; color: var(--ink-soft); }

ul.checklist { list-style: none; padding-left: 0; }
ul.checklist li { padding-left: 30px; position: relative; }
ul.checklist li::before { content: ""; position: absolute; left: 0; top: 6px; width: 15px; height: 15px; border: 2px solid var(--ink); }

code { background: var(--paper); border: 1px solid var(--frost); padding: 0 5px; font-size: 15px; }

footer.site { margin-top: 72px; border-top: 1px solid var(--frost); padding: 24px 0 44px; font-size: 14px; color: var(--ink-soft); }
footer.site p { margin: 4px 0; max-width: var(--measure); }
footer.site a { color: var(--ink-soft); }

@media (max-width: 560px) {
  body { font-size: 17px; }
  .page-head { padding-top: 32px; }
  .lede { font-size: 19px; }
  h2 { font-size: 24px; margin-top: 44px; }
  .bars { height: 150px; gap: 5px; }
  .bar-label { gap: 5px; font-size: 11px; }
}