/* larasolomon.com.au — shared stylesheet.
   Extracted from the original inline <style> when the site grew past one page, so that
   /, /about/ and /oeis/ cannot drift apart visually. No JavaScript anywhere on this site. */

:root {
  --ink:        #1c1a18;
  --ink-soft:   #4a453f;
  --ink-faint:  #6f6961;  /* 5.08:1 on --paper — WCAG AA for normal text */
  --paper:      #faf7f2;
  --paper-warm: #f2ede4;
  --rule:       #e0d8cb;
  --accent:     #6b5f4e;
  --accent-lit: #8c7c63;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink:        #ece7df;
    --ink-soft:   #b8b0a4;
    --ink-faint:  #8b8377;
    --paper:      #15140f;
    --paper-warm: #1e1c17;
    --rule:       #35312a;
    --accent:     #c4b498;
    --accent-lit: #ddcdaf;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: absolute; left: -9999px;
  background: var(--ink); color: var(--paper);
  padding: .6rem 1rem; z-index: 10;
}
.skip:focus { left: 1rem; top: 1rem; }

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- masthead ---------- */

header.masthead {
  padding: clamp(3rem, 9vw, 6.5rem) 0 clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--rule);
}
header.masthead.compact {
  padding: clamp(2.2rem, 6vw, 4rem) 0 clamp(1.6rem, 4vw, 2.6rem);
}
.portrait {
  display: block;
  width: 168px;
  height: 168px;
  object-fit: cover;
  border-radius: 3px;
  margin: 0 0 2.1rem;
  background: var(--paper-warm);
}
@media (max-width: 32rem) {
  .portrait { width: 132px; height: 132px; margin-bottom: 1.6rem; }
}

.eyebrow {
  font-family: var(--sans);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.1rem;
}
.eyebrow a { color: inherit; border-bottom-color: transparent; }
.eyebrow a:hover { color: var(--accent-lit); }

h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.7rem, 9vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  margin: 0 0 1.2rem;
}
h1.sub {
  font-size: clamp(2rem, 6vw, 3.1rem);
  line-height: 1.08;
  max-width: 30rem;
}
.standfirst {
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2.6vw, 1.4rem);
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 0;
  max-width: 34rem;
}
.standfirst strong { color: var(--ink); font-weight: 600; }

nav.sections {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.6rem;
  margin-top: 2.2rem;
}
nav.sections a {
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
nav.sections a:hover,
nav.sections a:focus-visible {
  color: var(--accent-lit);
  border-bottom-color: var(--accent-lit);
}
nav.sections a[aria-current="page"] { color: var(--ink); }

section[id] { scroll-margin-top: 1.5rem; }

/* ---------- sections ---------- */

main { padding-bottom: 1rem; }

section {
  padding: clamp(2.5rem, 6vw, 4rem) 0;
  border-bottom: 1px solid var(--rule);
}
section:last-of-type { border-bottom: 0; }

h2 {
  font-family: var(--sans);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.6rem;
}
h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 4vw, 1.95rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  margin: 0 0 .5rem;
}
h3 a { color: inherit; text-decoration: none; border: 0; }
h3 a:hover { color: var(--accent-lit); }

h4 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.28rem;
  line-height: 1.3;
  margin: 2rem 0 .6rem;
  max-width: 34rem;
}

.role {
  font-size: .82rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.1rem;
}

p { margin: 0 0 1.05rem; max-width: 36rem; }
p:last-child { margin-bottom: 0; }

p.more { margin-top: 1.6rem; }

ul.plain { max-width: 36rem; padding-left: 1.15rem; margin: 0 0 1.05rem; }
ul.plain li { margin-bottom: .5rem; }

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: border-color .15s, color .15s;
}
a:hover { color: var(--accent-lit); border-bottom-color: var(--accent-lit); }

address {
  font-style: normal;
  font-size: .93rem;
  color: var(--ink-soft);
  margin-top: 1.3rem;
  padding-left: 1rem;
  border-left: 2px solid var(--rule);
  line-height: 1.55;
}

code {
  font-family: var(--mono);
  font-size: .88em;
  background: var(--paper-warm);
  padding: .1em .35em;
  border-radius: 2px;
}

/* ---------- sequence list ---------- */

ol.sequences { list-style: none; margin: 0; padding: 0; }
ol.sequences > li {
  padding: 1.4rem 0;
  border-top: 1px solid var(--rule);
}
ol.sequences > li:last-child { border-bottom: 1px solid var(--rule); }

.seq-id {
  font-family: var(--mono);
  font-size: 1.02rem;
  letter-spacing: .01em;
}
.seq-title {
  display: block;
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.4;
  margin: .3rem 0 .55rem;
  max-width: 33rem;
}
.seq-credit {
  display: inline-block;
  font-size: .8rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--paper-warm);
  padding: .2rem .55rem;
  border-radius: 2px;
}
.seq-note { font-size: .93rem; color: var(--ink-soft); margin: .7rem 0 0; }

.bignum {
  display: block;
  font-family: var(--mono);
  font-size: clamp(.68rem, 2.1vw, .82rem);
  line-height: 1.5;
  color: var(--ink-soft);
  word-break: break-all;
  background: var(--paper-warm);
  border-left: 2px solid var(--accent);
  padding: .7rem .85rem;
  margin: .8rem 0 0;
  max-width: 33rem;
}
.bignum b { color: var(--ink); font-weight: 600; }
.bignum.identity {
  max-width: 36rem;
  word-break: normal;
  font-size: clamp(.85rem, 2.4vw, 1rem);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- facts ---------- */

dl.facts {
  display: grid;
  grid-template-columns: minmax(9rem, 12rem) 1fr;
  gap: 0;
  margin: 0;
  max-width: 38rem;
}
dl.facts dt {
  font-size: .75rem;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: .85rem 1rem .85rem 0;
  border-top: 1px solid var(--rule);
}
dl.facts dd {
  margin: 0;
  padding: .85rem 0;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
}
@media (max-width: 32rem) {
  dl.facts { grid-template-columns: 1fr; }
  dl.facts dt { padding-bottom: .1rem; border-top: 1px solid var(--rule); }
  dl.facts dd { padding-top: 0; border-top: 0; padding-bottom: .9rem; }
}

/* ---------- question-and-answer blocks ---------- */

.qa { margin: 0; max-width: 37rem; }
.qa > div { padding: 1.35rem 0; border-top: 1px solid var(--rule); }
.qa > div:last-child { border-bottom: 1px solid var(--rule); }
.qa dt {
  font-family: var(--serif);
  font-size: 1.16rem;
  line-height: 1.35;
  margin: 0 0 .5rem;
  color: var(--ink);
}
.qa dd { margin: 0; color: var(--ink-soft); }
.qa dd p { margin-bottom: .7rem; }

/* ---------- data table ---------- */

.tablewrap { overflow-x: auto; max-width: 100%; margin: 1.2rem 0; }
table.data {
  border-collapse: collapse;
  font-size: .9rem;
  min-width: 30rem;
}
table.data th, table.data td {
  text-align: left;
  padding: .55rem 1.2rem .55rem 0;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}
table.data th {
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
}
table.data td.num { font-family: var(--mono); font-size: .84rem; }

/* ---------- link grid ---------- */

ul.elsewhere { list-style: none; margin: 0; padding: 0; }
ul.elsewhere li { border-top: 1px solid var(--rule); }
ul.elsewhere li:last-child { border-bottom: 1px solid var(--rule); }
ul.elsewhere a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .3rem 1rem;
  padding: 1.05rem 0;
  border: 0;
}
ul.elsewhere a:hover .el-name { color: var(--accent-lit); }
.el-name {
  font-family: var(--serif);
  font-size: 1.18rem;
  flex: 0 0 auto;
  transition: color .15s;
}
.el-what { font-size: .9rem; color: var(--ink-faint); flex: 1 1 12rem; }
.el-arrow { color: var(--ink-faint); flex: 0 0 auto; }

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0 4rem;
  font-size: .87rem;
  color: var(--ink-faint);
}
footer p { max-width: 38rem; margin-bottom: .8rem; }
footer a { color: var(--ink-soft); }

@media print {
  body { background: #fff; color: #000; font-size: 11pt; }
  a { border: 0; }
}