:root {
  --u: 8px;

  --s1: calc(var(--u) * 1);
  --s2: calc(var(--u) * 2);
  --s3: calc(var(--u) * 3);
  --s4: calc(var(--u) * 4);
  --s5: calc(var(--u) * 6);
  --s6: calc(var(--u) * 9);
  --s7: calc(var(--u) * 12);

  --bg-body: #0E1116;
  --bg-shell: #0A0D12;
  --border-subtle: #242B36;

  --text-primary: #E6EAF0;
  --text-secondary: #A7B0BE;
  --text-tertiary: #6F7A8A;

  --highlight: #E07A2D;

  --max-width: 1200px;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg-body);
  color: var(--text-primary);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--highlight);
}

/* =========================
   HEADER
========================= */

header {
  background: var(--bg-shell);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--s3) var(--s2);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--s2);
}

.logo-mark {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "IBM Plex Sans", sans-serif;
  font-weight: 600;
}

.wordmark {
  font-family: "IBM Plex Sans", sans-serif;
  font-weight: 600;
}

/* NAV */

nav a {
  font-size: 14px;
}

.nav-separator {
  margin: 0 var(--s2);
  color: var(--text-tertiary);
  opacity: 0.6;
}

/* =========================
   FOOTER
========================= */

footer {
  background: var(--bg-shell);
  border-top: 1px solid var(--border-subtle);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--s3) var(--s2);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--s2);
  font-size: 13px;
  color: var(--text-tertiary);
}

.footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.footer-separator {
  margin: 0 var(--s2);
  color: var(--text-tertiary);
}

/* =========================
   GENERIC PAGE LAYOUT
========================= */

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--s2);
}

h1 {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 32px;
  font-weight: 600;
  margin: 0 0 var(--s5) 0;
}

h2 {
  font-family: "IBM Plex Sans", sans-serif;
  font-weight: 500;
  margin: var(--s5) 0 var(--s3);
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--s3);
  text-align: justify;
  hyphens: auto;
}

/* =========================
   ABOUT PAGE LAYOUT
========================= */

.two-column {
  display: grid;
  grid-template-columns: 7fr 1px 3fr;
  column-gap: var(--s5);
  align-items: stretch;
}

.divider {
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(36, 43, 54, 0.35) 20%,
    rgba(36, 43, 54, 0.35) 80%,
    transparent 100%
  );
  min-height: 100%;
}

.left-content {
  max-width: 69ch;
}

.right-column {
  padding-left: var(--s5);
}

.section-divider {
  height: 1px;
  margin: var(--s5) 0;
  background: linear-gradient(
    to right,
    transparent 0%,
    rgba(36, 43, 54, 0.35) 20%,
    rgba(36, 43, 54, 0.35) 80%,
    transparent 100%
  );
}

@media (max-width: 900px) {
  .two-column {
    grid-template-columns: 1fr;
  }

  .divider {
    display: none;
  }

  .right-column {
    padding-left: 0;
  }
}