:root {
  --ground: #EAF0F2;
  --ground-2: #DDE7EB;
  --ink: #0B2545;
  --ink-2: #3A4F66;
  --rule: #9DB0BC;
  --contour: #007C91;
  --water: #0B2545;
  --forest: #007C91;
  --on-contour: #FFFFFF;
  --contour-line: rgba(0, 124, 145, .5);
  --contour-index: rgba(0, 124, 145, .95);
  --minor-line: rgba(11, 37, 69, .2);
  --f-head: "Barlow Condensed", "Arial Narrow", sans-serif;
  --f-body: "Barlow", system-ui, -apple-system, "Segoe UI", sans-serif;
  --gutter: clamp(16px, 4vw, 48px);
  --max: 1180px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #08172B;
    --ground-2: #0F2540;
    --ink: #E8F0F2;
    --ink-2: #A9BCC8;
    --rule: #2F4A66;
    --contour: #3CC4D8;
    --water: #9CC0E4;
    --forest: #3CC4D8;
    --on-contour: #08172B;
    --contour-line: rgba(60, 196, 216, .45);
    --contour-index: rgba(60, 196, 216, .95);
    --minor-line: rgba(156, 192, 228, .25);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--f-body);
  text-rendering: optimizeLegibility;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: .22em; text-decoration-thickness: 1px; }
::selection { background: var(--contour); color: var(--on-contour); }
:focus-visible { outline: 3px solid var(--water); outline-offset: 3px; border-radius: 2px; }
.skip { position: absolute; left: 8px; top: -60px; background: var(--ink); color: var(--ground); padding: 10px 14px; z-index: 50; }
.skip:focus { top: 8px; }
html { scrollbar-color: var(--rule) var(--ground); }

h1, h2, h3 { font-family: var(--f-head); font-weight: 700; line-height: 1.02; margin: 0; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }

/* header */
.top {
  position: fixed; inset: 0 0 auto 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 12px 24px; flex-wrap: wrap;
  padding: 10px var(--gutter);
  background: color-mix(in srgb, var(--ground) 94%, transparent);
  border-bottom: 1px solid var(--rule);
}
.mark { display: flex; align-items: center; min-height: 44px; }
.mark img { height: 46px; width: auto; }
.top nav { display: flex; gap: 2px 6px; flex-wrap: wrap; }
.top nav a {
  font: 600 .95rem/1 var(--f-head); letter-spacing: .12em; text-transform: uppercase; text-decoration: none;
  padding: 14px 10px; min-height: 44px; display: inline-flex; align-items: center;
  border-bottom: 2px solid transparent;
}
.top nav a:hover { border-bottom-color: var(--contour); }

/* hero */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: flex-end;
  padding: 118px var(--gutter) var(--gutter);
  border-bottom: 1px solid var(--ink);
  overflow: hidden;
}
#terrain { position: absolute; inset: 0; width: 100%; height: 100%; }
.ticks { position: absolute; pointer-events: none; color: var(--ink-2); opacity: .55; }
.ticks-x { left: var(--gutter); right: var(--gutter); top: 100px; height: 8px;
  background: repeating-linear-gradient(90deg, currentColor 0 1px, transparent 1px 48px); }
.ticks-y { top: 100px; bottom: var(--gutter); left: calc(var(--gutter) - 12px); width: 8px;
  background: repeating-linear-gradient(0deg, currentColor 0 1px, transparent 1px 48px); }
.hero-inner { position: relative; width: 100%; max-width: var(--max); margin: 0 auto; display: grid; gap: 28px; }
.hero-copy {
  max-width: 760px; padding: clamp(18px, 3vw, 36px);
  background: color-mix(in srgb, var(--ground) 93%, transparent);
  border: 1px solid var(--ink);
}
h1 { font-size: clamp(2.7rem, 7.6vw, 5.4rem); letter-spacing: -.01em; }
.lede { margin-top: 18px; font-size: clamp(1.05rem, 2.2vw, 1.3rem); line-height: 1.5; color: var(--ink-2); max-width: 60ch; }
.actions { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 12px 22px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 14px 26px;
  background: var(--contour); color: var(--on-contour); text-decoration: none;
  font: 600 1.15rem/1 var(--f-head); letter-spacing: .1em; text-transform: uppercase;
  border: 1px solid var(--contour);
  transition: background-color .2s cubic-bezier(.16, 1, .3, 1), color .2s cubic-bezier(.16, 1, .3, 1);
}
.btn:hover { background: var(--ink); border-color: var(--ink); color: var(--ground); }
.btn-lg { min-height: 60px; padding: 18px 34px; font-size: 1.3rem; }
.btn-quiet { font: 600 1.05rem/1 var(--f-head); letter-spacing: .12em; text-transform: uppercase; padding: 14px 4px; min-height: 44px; display: inline-flex; align-items: center; }
.legend-strip { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.legend-strip li {
  font: 600 .95rem/1 var(--f-head); letter-spacing: .14em; padding: 9px 12px;
  background: var(--ground); border: 1px solid var(--ink);
}

/* sheets */
.sheet { padding: clamp(64px, 10vw, 120px) var(--gutter); max-width: calc(var(--max) + 2 * var(--gutter)); margin: 0 auto; }
.sheet-tint { max-width: none; background: var(--ground-2); border-block: 1px solid var(--rule); }
.sheet-tint > * { max-width: var(--max); margin-inline: auto; }
.sheet-head { display: grid; gap: 14px; margin-bottom: clamp(32px, 5vw, 56px); }
.sheet-head h2 { font-size: clamp(2.2rem, 5vw, 3.6rem); text-transform: uppercase; padding-bottom: 14px; border-bottom: 3px double var(--ink); }
.sheet-head p { color: var(--ink-2); max-width: 62ch; font-size: 1.1rem; }

.legend { list-style: none; margin: 0; padding: 0; counter-reset: none; }
.legend li {
  display: grid; grid-template-columns: 56px 1fr; gap: 20px;
  padding: 28px 0; border-top: 1px solid var(--rule);
}
.legend li:last-child { border-bottom: 1px solid var(--rule); }
.sym { width: 48px; height: 48px; color: var(--contour); }
.legend li:nth-child(3n+2) .sym { color: var(--water); }
.legend li:nth-child(3n) .sym { color: var(--forest); }
.legend h3 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: .005em; }
.legend p { margin-top: 10px; max-width: 70ch; }
.legend .refs { font: 600 1rem/1.4 var(--f-head); letter-spacing: .03em; color: var(--ink-2); margin-top: 14px; }

.cred-grid { display: grid; gap: 28px; }
.cred-group h3 { font-size: 1.35rem; letter-spacing: .04em; text-transform: uppercase; color: var(--ink-2); margin-bottom: 12px; }
.chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.chips li { font: 600 1.15rem/1.35 var(--f-head); letter-spacing: .04em; padding: 11px 16px; border: 1px solid var(--ink); background: var(--ground); }

.who { display: grid; gap: 36px; }
.who-copy { display: grid; gap: 18px; max-width: 68ch; font-size: 1.125rem; }
.facts { margin: 0; border: 1px solid var(--ink); background: var(--ground-2); align-self: start; }
.facts div { display: grid; grid-template-columns: 1fr; gap: 2px; padding: 14px 18px; border-top: 1px solid var(--rule); }
.facts div:first-child { border-top: 0; }
.facts dt { font: 600 .9rem/1.2 var(--f-head); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-2); }
.facts dd { margin: 0; font: 600 1.35rem/1.2 var(--f-head); letter-spacing: .02em; font-variant-numeric: tabular-nums; }

.contact { background: var(--ink); color: var(--ground); padding: clamp(64px, 10vw, 112px) var(--gutter); }
.contact-inner { max-width: var(--max); margin: 0 auto; display: grid; gap: 18px; justify-items: start; }
.contact h2 { font-size: clamp(2.4rem, 6vw, 4.4rem); text-transform: uppercase; }
.contact p { max-width: 54ch; font-size: 1.15rem; opacity: .9; }
.contact .btn { margin-top: 10px; }
.contact .btn:hover { background: var(--ground); border-color: var(--ground); color: var(--ink); }
.contact :focus-visible { outline-color: var(--ground); }

.foot { padding: 36px var(--gutter) 48px; max-width: calc(var(--max) + 2 * var(--gutter)); margin: 0 auto; display: grid; gap: 6px; color: var(--ink-2); }
.foot-logo { width: min(260px, 70%); height: auto; margin-bottom: 12px; }
.foot .fine { font-size: .9rem; margin-top: 10px; }

@media (min-width: 760px) {
  .hero-copy { padding: 40px 44px; }
  .legend li { grid-template-columns: 72px 1fr; gap: 32px; padding: 36px 0; }
  .sym { width: 56px; height: 56px; }
  .cred-grid { grid-template-columns: repeat(2, 1fr); gap: 36px 48px; }
  .who { grid-template-columns: 1.4fr 1fr; gap: 56px; }
}
@media (max-width: 520px) {
  .top { padding-block: 6px; }
  .mark img { height: 34px; }
  .top nav a { padding: 12px 7px; font-size: .86rem; letter-spacing: .05em; }
  .hero { padding-top: 132px; }
  .ticks-x, .ticks-y { top: 114px; }
  .btn { width: 100%; font-size: 1.02rem; letter-spacing: .05em; padding-inline: 12px; }
  .btn-lg { width: auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}