:root {
  --paper: #EEF1F7;
  --paper-card: #FFFFFF;
  --ink: #12162B;
  --ink-soft: #4A5170;
  --navy: #0A1232;
  --navy-deep: #060A1C;
  --gold: #C9932B;
  --gold-bg: #F7C948;
  --blue: #2B6FE0;
  --violet: #6E42E0;
  --border: #D8DEEA;
  --shadow: 0 1px 2px rgba(10, 18, 50, 0.04), 0 8px 24px rgba(10, 18, 50, 0.06);
}
:root[data-theme="dark"] {
  --paper: #0A1232;
  --paper-card: #121A3B;
  --ink: #E8EAF6;
  --ink-soft: #A7AFCC;
  --navy: #060A1C;
  --navy-deep: #040714;
  --gold: #F7C948;
  --gold-bg: #F7C948;
  --blue: #7CB0FF;
  --violet: #B79CFF;
  --border: #262F55;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 28px rgba(0, 0, 0, 0.35);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0A1232;
    --paper-card: #121A3B;
    --ink: #E8EAF6;
    --ink-soft: #A7AFCC;
    --navy: #060A1C;
    --navy-deep: #040714;
    --gold: #F7C948;
    --gold-bg: #F7C948;
    --blue: #7CB0FF;
    --violet: #B79CFF;
    --border: #262F55;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 28px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
}
a { color: var(--blue); text-decoration-color: color-mix(in srgb, var(--blue) 40%, transparent); }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible, .pill:focus-visible {
  outline: 2px solid var(--gold-bg); outline-offset: 2px; border-radius: 4px;
}
code { background: color-mix(in srgb, var(--ink) 6%, transparent); padding: 1px 6px; border-radius: 4px; font-size: 0.92em; }
h1, h2 {
  font-family: ui-serif, "Iowan Old Style", "Palatino Linotype", "Noto Serif", Georgia, serif;
  text-wrap: balance;
  color: var(--ink);
}
.muted { color: var(--ink-soft); }

/* ---------- Header band ---------- */
.band {
  position: relative;
  overflow: hidden;
  background: linear-gradient(155deg, var(--navy) 0%, var(--navy-deep) 100%);
  padding: 30px clamp(20px, 6vw, 48px);
}
.band-inner {
  position: relative;
  z-index: 2;
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}
.band img.mark { width: min(190px, 42vw); height: auto; display: block; flex-shrink: 0; }
.band .titles { min-width: 0; }
.band h1 { margin: 0 0 4px; font-size: clamp(1.5rem, 4vw, 2rem); color: #FBF6E8; line-height: 1.15; }
.band .titles p { margin: 0; color: #B9C2E6; font-size: 0.9rem; letter-spacing: 0.02em; }
.band .titles p strong { color: var(--gold-bg); font-weight: 700; }
.helix-bleed {
  position: absolute;
  right: -6%;
  top: 50%;
  transform: translateY(-50%);
  height: 145%;
  width: auto;
  opacity: 0.34;
  -webkit-mask-image: linear-gradient(to left, black 45%, transparent 92%);
  mask-image: linear-gradient(to left, black 45%, transparent 92%);
  z-index: 1;
  pointer-events: none;
}

/* ---------- Jump nav ---------- */
nav.jump {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}
nav.jump ul {
  max-width: 760px;
  margin: 0 auto;
  padding: 10px clamp(20px, 6vw, 48px);
  list-style: none;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
nav.jump a.pill {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--paper-card);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
nav.jump a.pill:hover { color: var(--ink); border-color: var(--blue); }

/* ---------- Main column ---------- */
main { max-width: 760px; margin: 0 auto; padding: clamp(28px, 6vw, 48px); }
.lede {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 42em;
}
.lede strong { color: var(--ink); }

section.record { margin-top: 2.6em; }
.eyebrow {
  display: block;
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 0.5em;
}
section.record h2 { font-size: 1.3rem; margin: 0 0 0.6em; }
section.record p, section.record li { color: var(--ink); }
section.record ul { padding-left: 1.15em; margin: 0.8em 0; }
section.record li { margin-bottom: 0.55em; }
section.record li::marker { color: var(--gold); }

/* ---------- Callout card ---------- */
.callout {
  position: relative;
  background: var(--paper-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 26px 26px 22px;
  box-shadow: var(--shadow);
  margin-top: 1.4em;
}
.callout img.mascot {
  position: absolute;
  top: -18px;
  right: 20px;
  width: 64px;
  height: 64px;
  filter: drop-shadow(0 6px 10px rgba(10,18,50,0.18));
}
.callout ul { padding-right: 60px; }

/* ---------- Table ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 1.2em 0;
  box-shadow: var(--shadow);
}
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; min-width: 640px; }
th, td { padding: 10px 13px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); }
thead th {
  background: var(--navy);
  color: #EDE4C2;
  font-family: ui-serif, "Iowan Old Style", Georgia, serif;
  font-weight: 600;
  font-size: 0.86rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
tbody tr:nth-child(even) { background: color-mix(in srgb, var(--ink) 3%, transparent); }
tbody tr:last-child td { border-bottom: none; }

/* ---------- Strand rule (DNA motif, CSS-drawn) ---------- */
.strand-rule {
  height: 4px;
  border-radius: 999px;
  margin: 3em 0 2.2em;
  background: linear-gradient(90deg, var(--blue), var(--violet), var(--gold-bg));
  opacity: 0.75;
}

footer { padding-bottom: 8px; }
footer address { font-style: normal; color: var(--ink-soft); line-height: 1.7; }
footer .see-also { margin-top: 1.6em; font-size: 0.88rem; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}