/* Tierra LLC: one stylesheet, system fonts, no external resources. Contrast meets WCAG AA. */
:root {
  --blue: #1F3A5F;       /* accents, header, links */
  --blue-dark: #162B47;  /* link hover */
  --bg: #F5F6F7;         /* neutral gray background */
  --panel: #FFFFFF;
  --text: #2E3338;
  --muted: #4A4F55;
  --line: #D9DCE0;
}

* { box-sizing: border-box; }

html { font-size: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
}

.skip {
  position: absolute;
  left: -999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  background: var(--panel);
  color: var(--blue);
  padding: 0.5rem 0.75rem;
  z-index: 10;
}

header {
  background: var(--blue);
  color: #FFFFFF;
}

.bar {
  max-width: 56rem;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.brand {
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
  letter-spacing: 0.01em;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}

nav a {
  color: #FFFFFF;
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}
nav a:hover,
nav a:focus { border-bottom-color: #FFFFFF; }
nav a[aria-current="page"] { border-bottom-color: #FFFFFF; font-weight: 600; }

main {
  max-width: 56rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 3rem;
}

h1 {
  color: var(--blue);
  font-size: clamp(1.75rem, 4vw + 1rem, 2.5rem);
  line-height: 1.2;
  margin: 0 0 1rem;
}

.lead {
  font-size: 1.25rem;
  color: var(--text);
  margin: 0 0 1.5rem;
}

p { margin: 0 0 1rem; max-width: 42rem; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--blue);
  border-radius: 0.25rem;
  padding: 1.25rem 1.25rem 0.25rem;
  margin: 0 0 2rem;
}

a { color: var(--blue); }
a:hover,
a:focus { color: var(--blue-dark); }
a:focus-visible,
.button:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }

.button {
  display: inline-block;
  background: var(--blue);
  color: #FFFFFF;
  text-decoration: none;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: 0.25rem;
}
.button:hover,
.button:focus { background: var(--blue-dark); color: #FFFFFF; }

.label {
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.email { font-size: 1.125rem; }

footer {
  border-top: 1px solid var(--line);
}
footer p {
  max-width: 56rem;
  margin: 0 auto;
  padding: 1.25rem 1rem;
  color: var(--muted);
  font-size: 0.9375rem;
}