@font-face { font-family: "IBM Plex Sans"; font-weight: 400; font-display: swap; src: url(fonts/ibm-plex-sans-latin-400-normal.woff2) format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-weight: 500; font-display: swap; src: url(fonts/ibm-plex-sans-latin-500-normal.woff2) format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-weight: 600; font-display: swap; src: url(fonts/ibm-plex-sans-latin-600-normal.woff2) format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-weight: 500; font-display: swap; src: url(fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2"); }

:root {
  --paper: #f5f3ee;
  --ink: #1b1d21;
  --muted: #4d5058;
  --rule: #d9d5cc;
  --accent: #1f3a5f;
  --accent-soft: #e4e8ee;
  --max: 1040px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 "IBM Plex Sans", system-ui, sans-serif;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* masthead */
.top {
  border-bottom: 1px solid var(--rule);
}
.top .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-top: 22px;
  padding-bottom: 18px;
}
.brand {
  font-weight: 600;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
.brand span { color: var(--accent); }
.top nav a {
  color: var(--ink);
  text-decoration: none;
  margin-left: 22px;
  font-size: 15px;
  padding: 10px 0;
  display: inline-block;
}
.top nav a[aria-current] { font-weight: 500; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.top nav a:hover, .top nav a[aria-current] { color: var(--accent); text-decoration: underline; }

/* intro */
.intro {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--rule);
}
.intro h1 {
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 600;
  margin: 0 0 22px;
  max-width: 15ch;
}
.intro p.lead { font-size: 19px; color: var(--muted); max-width: 46ch; margin: 0; }

/* sections */
section { padding: 56px 0; border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: 0; }
.sec-head {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
  gap: 40px;
}
.sec-head h2 {
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--accent);
  margin: 6px 0 0;
}
.sec-body > p:first-child { margin-top: 0; }
.sec-body p { max-width: 62ch; }

.mail {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 20px;
  font-weight: 500;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 12px 20px;
  font-weight: 500;
  font-size: 16px;
}
.btn:hover { background: var(--ink); }

footer {
  border-top: 1px solid var(--ink);
  font-size: 14px;
  color: var(--muted);
}
footer .wrap { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 8fr); gap: 12px 40px; padding-top: 28px; padding-bottom: 36px; }
footer p { margin: 6px 0 0; }
.brand.small { font-size: 17px; }
.foot-links a { color: var(--ink); text-decoration: none; margin-right: 22px; display: inline-block; padding: 2px 0; }
.foot-links a:hover { color: var(--accent); text-decoration: underline; }
.copy { grid-column: 2; font-size: 13px; }

/* two-column body inside a section */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.split h3, .sec-body h3 { font-size: 19px; font-weight: 600; margin: 0 0 6px; }
.split p { margin: 0; }

.legal { padding: 32px 0; }
.legal .sec-head h2 { font-size: 13px; }

@media (max-width: 760px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .top .wrap { flex-wrap: nowrap; align-items: center; padding-top: 6px; padding-bottom: 6px; gap: 12px; }
  .brand { font-size: 20px; }
  .top nav { display: flex; margin-right: -12px; }
  .top nav a { margin: 0; padding: 0 12px; min-height: 44px; display: inline-flex; align-items: center; }
  .intro { padding: 40px 0 36px; }
  .intro h1 { margin-bottom: 16px; }
  .intro p.lead { font-size: 18px; }
  .sec-head { grid-template-columns: 1fr; gap: 12px; }
  .sec-head h2 { margin: 0; }
  section { padding: 36px 0; }
  .legal { padding: 28px 0; }
  .split { grid-template-columns: 1fr; gap: 20px; }
  .sec-body p { margin: 0 0 14px; }
  .sec-body p:last-child { margin-bottom: 0; }
  .mail { font-size: 18px; overflow-wrap: anywhere; }
  footer .wrap { grid-template-columns: 1fr; gap: 8px; padding-top: 24px; padding-bottom: 24px; }
  footer p { margin: 2px 0 0; }
  .foot-links { display: grid; grid-template-columns: 1fr 1fr; margin-top: 8px; }
  .foot-links a { margin: 0; padding: 0; min-height: 44px; display: flex; align-items: center; }
  .copy { grid-column: 1; margin-top: 8px; padding-top: 16px; border-top: 1px solid var(--rule); }
}