/* Homepage only. Article styles and shared navigation scripts stay unchanged. */
.homepage {
  color-scheme: light;
  --paper: #fcfdf9;
  --ink: #28332e;
  --muted: #56645d;
  --mint: #74cfae;
  --mint-dark: #176a54;
  --mint-pale: #eaf5ef;
  --violet: #705487;
  --coral: #bd6253;
  --rule: #d9e3dc;
  --code: #f1f5f0;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
.homepage *, .homepage *::before, .homepage *::after { box-sizing: border-box; }
.homepage a { color: var(--mint-dark); text-decoration-thickness: 1px; text-underline-offset: .17em; }
.homepage a:hover { color: #0c4938; }
.homepage button, .homepage select { font: inherit; }
.homepage :focus-visible { outline: 2px solid var(--violet); outline-offset: 4px; }
.homepage main:focus { outline: none; }
.homepage svg { display: block; max-width: 100%; }
.homepage p { margin: 0 0 1.25rem; }
.homepage h1, .homepage h2, .homepage h3 {
  margin: 0;
  color: #202d27;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -.02em;
}
.homepage h1 { font-size: clamp(2.15rem, 4vw, 3rem); }
.homepage h2 { font-size: 1.65rem; }
.homepage h3 { font-size: 1.18rem; }
.homepage section, .homepage h2, .homepage h3 { scroll-margin-top: 2rem; }
.homepage [hidden] { display: none !important; }
.homepage .skip-link {
  position: fixed;
  z-index: 10;
  top: .5rem;
  left: .5rem;
  padding: .55rem .8rem;
  background: var(--ink);
  color: white;
  font: 600 .85rem/1.4 var(--mono);
  transform: translateY(-160%);
}
.homepage .skip-link:focus { transform: translateY(0); }
.homepage .site-header { border-bottom: 1px solid var(--rule); }
.homepage .nav {
  width: calc(100% - 3rem);
  max-width: 1060px;
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.homepage .brand {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  color: var(--mint-dark);
  font: 600 .85rem/1.4 var(--mono);
  text-decoration: none;
  white-space: nowrap;
}
.homepage .brand-mark { width: 9px; height: 9px; border: 2px solid var(--mint-dark); transform: rotate(45deg); }
.homepage .brand-cursor { color: var(--mint-dark); }
.homepage .nav-links { display: flex; align-items: center; gap: 1.35rem; font: .82rem/1.4 var(--mono); }
.homepage .nav-links a { display: block; min-height: 44px; padding: .75rem 0; color: var(--muted); text-decoration: none; }
.homepage .nav-links a:hover, .homepage .nav-links a[aria-current="page"] { color: var(--mint-dark); }
.homepage .nav-links a[aria-current="page"] { border-bottom: 1px solid var(--mint); }
.homepage main, .homepage .site-footer { width: calc(100% - 3rem); max-width: 1060px; margin-inline: auto; }
.homepage main { padding-top: clamp(2.6rem, 7vw, 5.4rem); overflow-wrap: break-word; }
.homepage .notebook-grid { display: grid; grid-template-columns: minmax(0, 65ch) minmax(0, 210px); column-gap: clamp(2.5rem, 6vw, 5rem); }
.homepage .notebook-grid > * { min-width: 0; }
.homepage .intro { padding-bottom: 3.3rem; grid-template-rows: max-content max-content 1fr; }
.homepage .intro-heading { grid-column: 1; grid-row: 1; }
.homepage .intro-copy { grid-column: 1; grid-row: 2; margin-top: 1.35rem; }
.homepage .intro-copy p { margin-bottom: 1rem; }
.homepage .kicker, .homepage .entry-kicker { color: var(--muted); font: .71rem/1.5 var(--mono); letter-spacing: .075em; text-transform: uppercase; }
.homepage .kicker { margin-bottom: .65rem; }
.homepage .entry-kicker { margin-bottom: .35rem; }
.homepage .margin-figure { grid-column: 2; grid-row: 1 / 4; align-self: stretch; margin: 0; padding-left: 1.25rem; border-left: 1px solid var(--rule); }
.homepage .figure-meta { display: flex; justify-content: space-between; gap: .5rem; margin-bottom: .9rem; color: var(--muted); font: .66rem/1.4 var(--mono); letter-spacing: .035em; }
.homepage .figure-meta span:last-child { color: var(--mint-dark); }
.homepage .margin-figure svg { width: 100%; height: auto; }
.homepage .margin-figure figcaption { margin-top: .7rem; color: var(--muted); font-size: .75rem; line-height: 1.55; }
.homepage .code-label { display: block; margin-bottom: .3rem; font: .7rem/1.5 var(--mono); }
.homepage .margin-figure code { display: block; margin-bottom: .55rem; padding: .55rem .6rem; border-left: 2px solid var(--mint); background: var(--code); color: #365149; font: .7rem/1.55 var(--mono); overflow-wrap: anywhere; }
.homepage .figure-note { display: block; }
.homepage .turtle-paper { fill: #f7faf5; }
.homepage .turtle-grid { stroke: #dfe8e0; stroke-width: .8; stroke-dasharray: 1 6; }
.homepage .turtle-path { fill: none; stroke: var(--mint-dark); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; vector-effect: non-scaling-stroke; }
.homepage .turtle-start { fill: var(--paper); stroke: var(--violet); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.homepage .turtle-end { fill: var(--violet); }
.homepage .turtle-controls { grid-column: 1; grid-row: 3; display: flex; flex-wrap: wrap; align-content: start; align-items: end; gap: .65rem; margin-top: .6rem; }
.homepage .control-label { display: grid; gap: .25rem; color: var(--muted); font: .75rem/1.4 var(--mono); }
.homepage select, .homepage .replay-button { min-height: 44px; border: 1px solid #acbdb3; border-radius: 3px; background: var(--paper); color: var(--ink); font: .8rem/1.2 var(--mono); }
.homepage select { padding: .55rem 2rem .55rem .65rem; cursor: pointer; }
.homepage .replay-button { padding: .55rem .85rem; border-color: var(--mint-dark); cursor: pointer; }
.homepage .replay-button:hover { background: var(--mint-pale); }
.homepage .replay-button:disabled { border-color: #acbdb3; color: var(--muted); cursor: default; }
.homepage .control-status { flex-basis: 100%; margin: -.15rem 0 0; color: var(--muted); font: .72rem/1.5 var(--mono); }
.homepage .detours { padding-top: 1rem; }
.homepage .section-heading { max-width: 65ch; margin-bottom: 2.4rem; }
.homepage .section-heading h2, .homepage .plain-heading h2 { display: inline; }
.homepage .section-number { display: inline-block; margin-right: .75rem; color: var(--mint-dark); font: .76rem/1.4 var(--mono); letter-spacing: .04em; vertical-align: .18em; }
.homepage .section-heading p { margin: .65rem 0 0; color: var(--muted); }
.homepage .entry { margin-bottom: 3.2rem; grid-template-rows: max-content 1fr; }
.homepage .entry-heading { grid-column: 1; grid-row: 1; margin-bottom: 1rem; }
.homepage .entry-copy { grid-column: 1; grid-row: 2; }
.homepage .entry-copy p:last-child { margin-bottom: 0; }
.homepage .entry .margin-figure { grid-row: 1 / 3; }
.homepage .spectrogram-axis { fill: none; stroke: #b7c8bd; stroke-width: 1; }
.homepage .spectrogram-calls { fill: none; stroke: var(--mint-dark); stroke-width: 4; stroke-dasharray: 1 4; stroke-linecap: round; }
.homepage .drawing-label { fill: var(--muted); font: 7px var(--mono); }
.homepage .drawing-label-accent { fill: var(--violet); font: 7px var(--mono); }
.homepage .annotation-line { fill: none; stroke: var(--violet); stroke-width: 1; stroke-linecap: round; stroke-linejoin: round; }
.homepage .branch-main { fill: none; stroke: var(--mint-dark); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.homepage .branch-offshoot { fill: none; stroke: var(--mint); stroke-width: 1.4; stroke-linecap: round; }
.homepage .branch-node { fill: var(--paper); stroke: var(--violet); stroke-width: 1.3; }
.homepage .branch-arrow { fill: var(--violet); }
.homepage .ultrasound-sector { fill: var(--mint-pale); stroke: var(--mint-dark); stroke-width: 1.4; stroke-linejoin: round; }
.homepage .ultrasound-ring { fill: none; stroke: #83b7a3; stroke-width: .85; }
.homepage .ultrasound-beam { fill: none; stroke: #c0d8cc; stroke-width: .65; }
.homepage .ultrasound-echo { fill: none; stroke: var(--coral); stroke-width: 2.1; stroke-linecap: round; }
.homepage .ultrasound-origin { fill: var(--violet); }
.homepage .plain-section { margin: 1rem 0 3rem; }
.homepage .plain-heading { grid-column: 1; grid-row: 1; margin-bottom: 1.15rem; }
.homepage .plain-body { grid-column: 1; grid-row: 2; }
.homepage .plain-body p:last-child { margin-bottom: 0; }
.homepage .writing-list { margin: 0 0 1.25rem; padding-left: 1.2rem; }
.homepage .writing-list li { margin-bottom: .9rem; padding-left: .2rem; }
.homepage .writing-list li::marker { color: var(--mint-dark); }
.homepage .site-footer { display: flex; flex-wrap: wrap; gap: 1.4rem; margin-top: 1.5rem; padding: 1.6rem 0 2.6rem; border-top: 1px solid var(--rule); font: .76rem/1.5 var(--mono); }
.homepage .site-footer::before { content: "~/elsewhere"; margin-right: auto; color: var(--muted); }
.homepage .site-footer a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; }
.homepage .site-footer a:hover { text-decoration: underline; }
@media (min-width: 1100px) {
  .homepage .intro .turtle-figure { padding-top: .35rem; }
  .homepage .intro .turtle-figure svg { margin-top: 1.2rem; }
}
@media (max-width: 820px) {
  .homepage { font-size: 17px; }
  .homepage .nav, .homepage main, .homepage .site-footer { width: calc(100% - 2rem); }
  .homepage .nav { min-height: 66px; gap: .75rem; }
  .homepage .brand { font-size: .72rem; gap: .4rem; }
  .homepage .nav-links { gap: .75rem; font-size: .7rem; }
  .homepage .notebook-grid { grid-template-columns: minmax(0, 1fr) 92px; column-gap: 1rem; }
  .homepage .intro { padding-bottom: 2.5rem; grid-template-rows: auto; }
  .homepage .intro-heading { grid-column: 1; grid-row: 1; align-self: center; min-height: 145px; display: flex; flex-direction: column; justify-content: center; }
  .homepage .intro-copy { grid-column: 1 / -1; grid-row: 2; margin-top: 1.3rem; }
  .homepage .margin-figure { display: contents; }
  .homepage .margin-figure svg { grid-column: 2; grid-row: 1; align-self: center; }
  .homepage .margin-figure .figure-meta, .homepage .micro-labels { display: none; }
  .homepage .margin-figure figcaption { grid-column: 1 / -1; grid-row: 3; margin: .7rem 0 0; font-size: .8rem; }
  .homepage .turtle-figure figcaption { margin: 0; }
  .homepage .turtle-controls { grid-column: 1 / -1; grid-row: 4; margin-top: .7rem; }
  .homepage .turtle-paper { fill: transparent; }
  .homepage .entry { margin-bottom: 2.6rem; grid-template-rows: max-content auto auto; }
  .homepage .entry-heading { align-self: center; margin-bottom: 1rem; }
  .homepage .entry-copy { grid-column: 1 / -1; }
  .homepage .entry-kicker { font-size: .63rem; }
  .homepage .section-heading { margin-bottom: 2rem; }
  .homepage .plain-heading, .homepage .plain-body { grid-column: 1 / -1; }
}
@media (max-width: 420px) {
  .homepage .nav { flex-wrap: wrap; gap: 0; padding: .65rem 0; }
  .homepage .brand { min-height: 44px; margin-right: auto; }
  .homepage .brand-cursor { display: none; }
  .homepage .nav-links { gap: .65rem; }
  .homepage .nav-links a[aria-current="page"] { display: none; }
  .homepage main { padding-top: 2.1rem; }
  .homepage h1 { font-size: 2rem; }
  .homepage h2 { font-size: 1.45rem; }
  .homepage .notebook-grid { grid-template-columns: minmax(0, 1fr) 82px; column-gap: .75rem; }
  .homepage .kicker { font-size: .62rem; }
  .homepage .site-footer::before { flex-basis: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .homepage *, .homepage *::before, .homepage *::after { animation: none !important; transition: none !important; }
}
@media print {
  .homepage { background: white; font-size: 11pt; }
  .homepage .site-header, .homepage .skip-link, .homepage .turtle-controls, .homepage .site-footer { display: none; }
  .homepage main { width: 100%; max-width: none; padding: 0; }
  .homepage .notebook-grid { grid-template-columns: minmax(0, 1fr) 140px; column-gap: 1.5rem; }
  .homepage .entry, .homepage .plain-section { break-inside: avoid; }
  .homepage a { color: inherit; }
}