@font-face { font-family: "Source Serif 4"; font-style: normal; font-weight: 200 900; font-display: swap; src: url("fonts/source-serif-4-normal-latin.woff2?v=e74dd9c166") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: "Source Serif 4"; font-style: normal; font-weight: 200 900; font-display: swap; src: url("fonts/source-serif-4-normal-latin-ext.woff2?v=e74dd9c166") format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: "Source Serif 4"; font-style: italic; font-weight: 200 900; font-display: swap; src: url("fonts/source-serif-4-italic-latin.woff2?v=e74dd9c166") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+2000-206F; }
@font-face { font-family: "Source Serif 4"; font-style: italic; font-weight: 200 900; font-display: swap; src: url("fonts/source-serif-4-italic-latin-ext.woff2?v=e74dd9c166") format("woff2"); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+1E00-1E9F; }

:root {
  --paper: #f6f1e7; --paper-2: #ece4d3; --ink: #1d1a16; --muted: #4a4236; --rule: #cfc3ad;
  --accent: #843d00; --accent-ink: #ffffff; --link: #7a3a00;
  --map-bg: #eee8da; --map-land: #ddd3bd; --map-coast: #b9ab8e; --map-dot: #8f8269;
  --anc: #c25e00; --fr: #1f5fa8; --both: #6b2d8f; --seed: #1d1a16;
  --eu: #1f5fa8; --slots: #c25e00;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --bar: 3rem;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #12141a; --paper-2: #1b1e26; --ink: #efe9dd; --muted: #c2b9a8; --rule: #353a46;
    --accent: #ffa84a; --accent-ink: #1a1206; --link: #ffbd73;
    --map-bg: #0d0f14; --map-land: #232733; --map-coast: #3a4050; --map-dot: #4b5163;
    --anc: #ff9a2e; --fr: #6cb2ff; --both: #e6a8ff; --seed: #ffffff;
    --eu: #6cb2ff; --slots: #ff9a2e;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #12141a; --paper-2: #1b1e26; --ink: #efe9dd; --muted: #c2b9a8; --rule: #353a46;
  --accent: #ffa84a; --accent-ink: #1a1206; --link: #ffbd73;
  --map-bg: #0d0f14; --map-land: #232733; --map-coast: #3a4050; --map-dot: #4b5163;
  --anc: #ff9a2e; --fr: #6cb2ff; --both: #e6a8ff; --seed: #ffffff;
  --eu: #6cb2ff; --slots: #ff9a2e;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 1.1875rem/1.6 var(--serif); }
a { color: var(--link); text-underline-offset: 0.15em; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: 0.5rem 1rem; z-index: 50; }
.skip:focus { left: 0.5rem; }

/* one-line bar */
.topbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 0.9rem; height: var(--bar); padding: 0 1rem; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--rule); font: 500 0.9rem/1 var(--sans); white-space: nowrap; }
.topbar a { color: var(--ink); text-decoration: none; }
.topbar .home { font-weight: 700; }
.topnav { display: flex; gap: 0.9rem; overflow-x: auto; scrollbar-width: none; min-width: 0; }
.topnav::-webkit-scrollbar { display: none; }
.topnav a { padding: 0.9rem 0.1rem; border-bottom: 2px solid transparent; }
.topnav a[aria-current] { border-bottom-color: var(--accent); }
.spacer { flex: 1; }
.chip { border: 1px solid var(--rule); border-radius: 999px; padding: 0.35rem 0.7rem; }
.icon-btn { display: inline-grid; place-items: center; width: 2.75rem; height: 2.75rem; margin-right: -0.5rem; border: 0; background: none; color: var(--ink); border-radius: 50%; cursor: pointer; }
.icon-btn svg { display: block; }
.icon-btn svg[hidden] { display: none; }

/* reading rail */
.rail { display: none; }
@media (min-width: 76rem) {
  .rail { display: flex; flex-direction: column; gap: 0.9rem; position: fixed; right: 1.4rem; top: 50%; transform: translateY(-50%); z-index: 15; font: 500 0.8rem/1 var(--sans); }
  .rail a { display: flex; align-items: center; justify-content: flex-end; gap: 0.6rem; color: var(--muted); text-decoration: none; min-height: 1.1rem; }
  .rail a span { opacity: 0; transition: opacity .2s; background: var(--paper); padding: 0.15rem 0.3rem; }
  .rail a:hover span, .rail a:focus-visible span { opacity: 1; }
  .rail i { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); transition: transform .2s; }
  .rail a[aria-current] i { background: var(--accent); transform: scale(1.45); }
}
@media print { .rail, .topbar { display: none; } }

main > section { scroll-margin-top: calc(var(--bar) + 0.5rem); }
.block { max-width: 40rem; margin: 0 auto; padding: 3.5rem 1rem; }
.block.wide { max-width: 72rem; }
.block.wide > h2, .block.wide > p, .block.wide > .friend, .block.wide > .notes { max-width: 40rem; margin-left: auto; margin-right: auto; }
h1, h2 { font-family: var(--serif); line-height: 1.12; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.7rem, 1.2rem + 2vw, 2.5rem); margin: 0 0 1rem; }
p { margin: 0 0 1.05em; }
.lede { font-size: 1.1em; color: var(--muted); }
.muted { color: var(--muted); }

.hero { max-width: 44rem; margin: 0 auto; padding: 3.2rem 1rem 3rem; min-height: calc(100svh - var(--bar)); display: flex; flex-direction: column; justify-content: center; }
.kicker { font: 600 0.85rem/1.2 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.8rem; }
h1 { font-size: clamp(2.3rem, 1.4rem + 4.2vw, 4.2rem); margin: 0 0 1rem; font-weight: 650; }
.deck { font-size: clamp(1.15rem, 1rem + 0.6vw, 1.4rem); line-height: 1.5; margin-bottom: 1.6rem; }

.seeds fieldset { border: 0; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem 0.9rem; }
.seeds legend { font: 700 1rem/1.3 var(--sans); margin-bottom: 0.6rem; padding: 0; }
.gp label { display: block; font: 500 0.85rem/1.3 var(--sans); color: var(--muted); margin-bottom: 0.25rem; }
.combo { position: relative; }
input.town, #born { width: 100%; font: 400 1.05rem/1.2 var(--sans); padding: 0.7rem 0.75rem; min-height: 2.9rem; border: 1px solid var(--rule); border-radius: 0.5rem; background: var(--paper-2); color: var(--ink); }
.list { position: absolute; z-index: 30; left: 0; right: 0; top: calc(100% + 0.25rem); margin: 0; padding: 0.25rem; list-style: none; background: var(--paper); border: 1px solid var(--rule); border-radius: 0.5rem; box-shadow: 0 10px 30px rgba(0,0,0,.18); font: 400 0.95rem/1.3 var(--sans); max-height: 20rem; overflow: auto; }
.list li { padding: 0.55rem 0.6rem; border-radius: 0.35rem; cursor: pointer; min-height: 2.75rem; display: flex; align-items: baseline; gap: 0.45rem; flex-wrap: wrap; }
.list li span { color: var(--muted); font-size: 0.85em; }
.list li[aria-selected="true"], .list li:hover { background: var(--paper-2); }
.list li.none { color: var(--muted); cursor: default; }
.hint { font: 400 0.9rem/1.4 var(--sans); color: var(--muted); margin: 0.8rem 0 1rem; }
.row { display: flex; flex-wrap: wrap; align-items: end; gap: 0.7rem 0.9rem; }
.row label { flex-basis: 100%; font: 500 0.85rem/1.3 var(--sans); color: var(--muted); margin-bottom: -0.4rem; }
#born { width: 7.5rem; }
.go, .btn { font: 600 1rem/1 var(--sans); min-height: 2.9rem; padding: 0 1.1rem; border-radius: 0.5rem; border: 1px solid var(--rule); background: var(--paper-2); color: var(--ink); cursor: pointer; }
.go, .btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.chip-btn { font: 500 0.95rem/1 var(--sans); min-height: 2.75rem; padding: 0 0.9rem; border-radius: 999px; border: 1px solid var(--rule); background: transparent; color: var(--ink); cursor: pointer; }
.presets { display: flex; flex-wrap: wrap; gap: 0.45rem; align-items: center; margin-top: 0.6rem; font: 400 0.9rem/1 var(--sans); color: var(--muted); }

/* doubling chart */
.chart { margin: 1.4rem 0 1.6rem; }
.dbl svg { width: 100%; height: auto; display: block; font: 500 12px/1 var(--sans); }
.dbl text { fill: var(--muted); }
.dbl .grid { stroke: var(--rule); stroke-width: 1; }
.dbl .slots { fill: none; stroke: var(--slots); stroke-width: 3.2; }
.dbl .eu { fill: none; stroke: var(--eu); stroke-width: 3.2; }
.dbl .eu-pt { fill: var(--eu); }
.dbl .cross { fill: none; stroke: var(--ink); stroke-width: 2.2; }
figcaption { font: 400 0.95rem/1.5 var(--sans); color: var(--muted); margin-top: 0.7rem; }
.key { display: inline-block; width: 1.1rem; height: 0.3rem; border-radius: 2px; vertical-align: middle; margin: 0 0.35rem 0.1rem 0; }
.k-slots { background: var(--slots); }
.k-eu { background: var(--eu); margin-left: 0.3rem; }

/* maps */
.mapfig { margin: 1.4rem 0 1.6rem; }
.stage { position: relative; background: var(--map-bg); border-radius: 0.6rem; overflow: hidden; }
.stage canvas { display: block; width: 100%; height: min(72svh, 44rem); }
.yearbig { position: absolute; left: 1rem; top: 0.6rem; margin: 0; font: 700 clamp(2rem, 1.2rem + 3.5vw, 4rem)/1 var(--serif); color: var(--ink); text-shadow: 0 0 12px var(--map-bg), 0 0 4px var(--map-bg); pointer-events: none; font-variant-numeric: tabular-nums; }
.controls { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-top: 0.8rem; }
.slider { flex: 1 1 12rem; display: flex; align-items: center; gap: 0.6rem; font: 500 0.9rem/1 var(--sans); color: var(--muted); min-height: 2.75rem; }
.slider input { flex: 1; accent-color: var(--accent); min-height: 2.75rem; direction: rtl; }
.slider.wide input { direction: ltr; }
.slider output { min-width: 1.6rem; font-weight: 700; color: var(--ink); }
.readout { font: 400 1.05rem/1.5 var(--sans); margin-top: 0.8rem; min-height: 5.5em; }
.readout p { margin: 0 0 0.35rem; }
#ro1, #ro4 { font-size: 1.15rem; font-weight: 600; }
.model { font-size: 0.88rem; }
.legend { font: 500 0.95rem/1.8 var(--sans); margin: 0.6rem 0 0; }
.sw { display: inline-block; width: 0.85rem; height: 0.85rem; border-radius: 50%; vertical-align: -0.1rem; margin: 0 0.3rem 0 0.8rem; }
.sw:first-child { margin-left: 0; }
.sw-you { background: var(--anc); } .sw-fr { background: var(--fr); } .sw-both { background: var(--both); }
.notes p { font-size: 1.02rem; }
.pull { font-size: 1.25em; line-height: 1.45; border-left: 4px solid var(--accent); padding-left: 1rem; }
#dna { display: block; width: 100%; height: min(60svh, 26rem); }
.end h2 { font-size: clamp(1.9rem, 1.3rem + 2.4vw, 2.8rem); }
.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.teach { border-top: 1px solid var(--rule); }
.teach ul { padding-left: 1.1rem; }
.teach li { margin-bottom: 0.8rem; }
.sources { border-top: 1px solid var(--rule); font-size: 1rem; }
.sources .method { font-size: 1rem; }
.srcs { font: 400 0.9rem/1.45 var(--sans); padding-left: 1.1rem; }
.srcs li { margin-bottom: 0.55rem; overflow-wrap: anywhere; }
.related { font: 400 1rem/1.5 var(--sans); }
.stamp { color: var(--muted); font: 400 0.9rem/1.4 var(--sans); }
.foot { border-top: 1px solid var(--rule); padding: 1.5rem 1rem 2.5rem; text-align: center; font: 400 0.95rem/1.5 var(--sans); color: var(--muted); }
.no-map .mapfig .stage::after { content: ""; }

@media (max-width: 40rem) {
  body { font-size: 1.08rem; }
  .seeds fieldset { grid-template-columns: 1fr; }
  .stage canvas { height: 62svh; }
  .block { padding: 2.6rem 1rem; }
  .hero { min-height: auto; padding-top: 2rem; }
  .topbar .home { font-size: 0.85rem; }
  .topnav { gap: 0.7rem; }
}
@media (min-width: 64rem) {
  /* projector and desktop: one idea per screen */
  .block { min-height: calc(100svh - var(--bar)); display: flex; flex-direction: column; justify-content: center; }
  .block.teach, .block.sources { min-height: 0; }
}
.guess { font: 400 0.8rem/1.3 var(--sans); color: var(--muted); margin: 0.25rem 0 0; }
.guess[hidden] { display: none; }
.stage .still { position: absolute; inset: auto 1rem 1rem 1rem; margin: 0; font: 500 1.05rem/1.5 var(--sans); color: var(--ink); background: color-mix(in srgb, var(--paper) 88%, transparent); padding: 0.8rem 1rem; border-radius: 0.5rem; }
.drawn .still { display: none; }
.no-js .controls, .no-js .readout, .no-js .presets, .no-js #dna, .no-js .seeds .row button { display: none; }