/* DataSponge public site. Swiss institutional modernism: strict grid, fine rules, IBM Plex. */
:root {
  --navy: #101D27;
  --paper: #F3F2EC;
  --mineral: #C5D6D0;
  --teal: #367C81;      /* fills, rules, large type */
  --teal-ink: #2B666B;  /* small link text: 5:1 on paper */
  --ochre: #D3A765;     /* sparing accents only, never text on paper */
  --muted: #4A5761;
  --rule: #101D2733;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --gutter: clamp(16px, 4vw, 56px);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--navy); font: 400 17px/1.6 var(--sans); }
a { color: var(--teal-ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--navy); }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; }
.label { font: 500 11px/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }

/* Masthead */
.masthead { display: flex; align-items: center; gap: 28px; padding: 18px var(--gutter); background: var(--navy); color: var(--paper); border-bottom: 3px solid var(--ochre); }
.brand { display: flex; align-items: center; gap: 12px; color: var(--paper); text-decoration: none; font: 700 20px/1 var(--sans); letter-spacing: -.01em; }
.mark { display: grid; gap: 3px; width: 22px; }
.mark i { display: block; height: 2px; background: var(--paper); }
.mark i:last-child { width: 60%; background: var(--ochre); height: 4px; }
.masthead nav { margin-left: auto; display: flex; gap: 28px; font: 500 13px var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.masthead nav a { color: var(--paper); text-decoration: none; padding: 6px 0; border-bottom: 1px solid transparent; }
.masthead nav a[aria-current="page"] { border-bottom-color: var(--ochre); }
.masthead nav a:hover { border-bottom-color: var(--paper); }
.masthead nav .sign-in { border: 1px solid #F3F2EC80; padding: 6px 12px; }
.masthead nav .sign-in:hover { background: var(--paper); color: var(--navy); }

main { max-width: 1320px; margin: 0 auto; padding: 0 var(--gutter); }
.hero { padding: 88px 0 96px; max-width: 900px; }
h1 { margin: 0 0 32px; font: 700 clamp(56px, 9vw, 132px)/.92 var(--sans); letter-spacing: -.045em; }
.lede { margin: 0; max-width: 34em; font-size: clamp(19px, 1.7vw, 23px); line-height: 1.5; }
.button { display: inline-block; margin-top: 36px; padding: 14px 20px; background: var(--navy); color: var(--paper); text-decoration: none; font: 500 15px var(--sans); border: 1px solid var(--navy); }
.button:hover { background: var(--teal); border-color: var(--teal); color: var(--paper); }

/* Colophon */
.colophon { max-width: 1320px; margin: 0 auto; padding: 28px var(--gutter) 48px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; font-size: 14px; }
.colophon > div { display: grid; gap: 6px; align-content: start; border-top: 1px solid var(--navy); padding-top: 12px; }
.colophon a { color: var(--navy); }

@media (max-width: 860px) {
  .hero { padding: 48px 0 56px; }
  .colophon { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .masthead { flex-wrap: wrap; gap: 14px; }
  .masthead nav { margin-left: 0; width: 100%; gap: 18px; }
}