:root {
  color-scheme: light;
  --ivory: #f5f0e6;
  --paper: #fbf8f2;
  --ink: #1f1e1c;
  --ink-2: #4a4741;
  --ink-3: #6b665d;
  --line: #d6cdbd;
  --terra: #c0603a;
  --terra-text: #9c4422;
  --terra-soft: #ecd3c4;
  --sage: #c9d6c8;
  --blue: #c9d4de;
  --lavender: #d8d4e5;
  --sand: #e9e0d0;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --measure: 40rem;
  --gutter: clamp(1rem, 4vw, 3rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ivory);
  color: var(--ink);
  font: 1.0625rem/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--terra-text); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; border-radius: 3px; }

.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: .5rem 1rem; z-index: 10; }
.skip:focus { left: 1rem; top: 1rem; }

/* ---------- top bar ---------- */
.topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  max-width: 76rem; margin: 0 auto; padding: 1.25rem var(--gutter) .9rem;
  border-bottom: 1px solid var(--ink);
  font-size: .9rem;
}
.topbar .mark { font-family: var(--serif); font-size: 1.1rem; color: var(--ink); text-decoration: none; }
.topbar nav { display: flex; flex-wrap: wrap; gap: .25rem 1.25rem; }
.topbar nav a { color: var(--ink-2); text-decoration: none; }
.topbar nav a:hover { color: var(--terra-text); text-decoration: underline; }

/* ---------- layout ---------- */
main { max-width: 76rem; margin: 0 auto; padding: 0 var(--gutter); }
section { padding: clamp(3rem, 8vw, 6rem) 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
.eyebrow {
  font: 600 .78rem/1.2 var(--sans); letter-spacing: .08em; text-transform: uppercase;
  color: var(--terra-text); margin: 0 0 1rem; display: flex; gap: .75rem; align-items: baseline;
}
.eyebrow .num { font-family: var(--serif); font-size: 1rem; letter-spacing: 0; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; line-height: 1.12; margin: 0 0 1rem; letter-spacing: -.01em; }
h1 { font-size: clamp(2.4rem, 6.5vw, 4.6rem); max-width: 14ch; }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); max-width: 22ch; }
h3 { font-size: 1.35rem; }
p { margin: 0 0 1rem; max-width: var(--measure); }
.lede { font-size: 1.2rem; color: var(--ink-2); }
.small { font-size: .9rem; color: var(--ink-3); }

.split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
.split.flip > :first-child { order: 2; }
@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; }
  .split.flip > :first-child { order: 0; }
}

.panel { border-radius: 4px; padding: clamp(1.25rem, 3vw, 2rem); }
.panel.lavender { background: var(--lavender); }
.panel.sage { background: var(--sage); }
.panel.blue { background: var(--blue); }
.panel.sand { background: var(--sand); }
.panel.paper { background: var(--paper); border: 1px solid var(--line); }

/* ---------- notice ---------- */
.notice {
  display: grid; grid-template-columns: auto 1fr; gap: .4rem 1rem; align-items: start;
  border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink);
  padding: .9rem 0; margin: 1.75rem 0 2rem; max-width: 44rem; font-size: .93rem;
}
.notice strong { font: 600 .74rem/1.9 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--terra-text); }
.notice p { margin: 0; }

/* ---------- hero ---------- */
.hero { padding-top: clamp(2.5rem, 6vw, 4.5rem); }
.hero .art { padding: 1.5rem 1rem 0; }

/* ---------- drawings ---------- */
.drawing { --stroke: var(--ink); }
.drawing .s { fill: none; stroke: var(--ink); stroke-width: 3.2; stroke-linecap: round; stroke-linejoin: round; }
.drawing .t { fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.drawing .head { fill: var(--paper); stroke: var(--ink); stroke-width: 3.2; }
.drawing .page { fill: var(--paper); stroke: var(--ink); stroke-width: 2.6; stroke-linejoin: round; }
.drawing .accent { fill: var(--terra); }
.drawing .accent-s { fill: none; stroke: var(--terra); stroke-width: 3.2; stroke-linecap: round; }
.drawing .dot { fill: var(--ink); }
.drawing text { font-family: var(--sans); fill: var(--ink); }
.drawing .serif { font-family: var(--serif); }

/* gentle motion, only when allowed */
@media (prefers-reduced-motion: no-preference) {
  .js .wobble { transform-box: fill-box; transform-origin: 50% 90%; animation: wobble 6s ease-in-out infinite; }
  @keyframes wobble { 0%, 100% { transform: rotate(-3deg); } 50% { transform: rotate(3deg); } }
  .js .float { animation: float 5s ease-in-out infinite; }
  @keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
  .js .draw { stroke-dasharray: var(--len, 600); stroke-dashoffset: var(--len, 600); transition: stroke-dashoffset 1.6s ease; }
  .js .in-view .draw { stroke-dashoffset: 0; }
  .js .turn { transform-box: fill-box; transform-origin: 50% 100%; transition: transform 1s ease .5s; }
  .js .in-view .turn { transform: rotate(-12deg); }
  .js .glass { transition: transform 1.8s cubic-bezier(.5,.1,.2,1) .3s; transform: translate(-70px, 30px); }
  .js .in-view .glass { transform: translate(0, 0); }
  .js .reveal { opacity: 0; transition: opacity .8s ease 1.6s; }
  .js .in-view .reveal { opacity: 1; }
}

/* ---------- pipeline ---------- */
.pipeline { list-style: none; margin: 2.5rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; counter-reset: step; position: relative; }
.pipeline li { counter-increment: step; }
.pipeline .card { height: 100%; display: flex; flex-direction: column; gap: .75rem; }
.pipeline .card svg { width: 100%; max-height: 150px; }
.pipeline h3 { font-size: 1.15rem; margin: 0; }
.pipeline h3::before { content: counter(step, decimal-leading-zero) "  "; font-family: var(--serif); color: var(--terra-text); }
.pipeline p { font-size: .95rem; margin: 0; }
.connector { margin: 1.5rem 0 0; width: 100%; height: 34px; }
@media (max-width: 860px) {
  .pipeline { grid-template-columns: 1fr 1fr; }
  .connector { display: none; }
}
@media (max-width: 520px) { .pipeline { grid-template-columns: 1fr; } }

.aside-note {
  margin-top: 2rem; padding: 1rem 1.25rem; border-left: 3px solid var(--terra);
  background: var(--paper); max-width: 46rem; font-size: .97rem;
}
.aside-note p { margin: 0; }

/* ---------- score comparison ---------- */
.totals { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 2rem 0 1.5rem; max-width: 46rem; }
.total { border: 1px solid var(--ink); background: var(--paper); padding: 1.25rem 1.4rem; border-radius: 4px; }
.total .who { font: 600 .78rem/1.3 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); }
.total .n { font-family: var(--serif); font-size: clamp(2.6rem, 7vw, 3.6rem); line-height: 1; margin: .5rem 0 .4rem; }
.total .n span { font-size: .45em; color: var(--ink-3); }
.total .for { font-size: .9rem; color: var(--ink-2); margin: 0; }
@media (max-width: 520px) { .totals { grid-template-columns: 1fr; } }

.btn {
  font: 600 .95rem/1 var(--sans); color: var(--paper); background: var(--ink);
  border: 1px solid var(--ink); border-radius: 999px; padding: .85rem 1.3rem; cursor: pointer;
  display: inline-flex; align-items: center; gap: .6rem;
}
.btn:hover { background: var(--terra-text); border-color: var(--terra-text); }
.btn .chev { transition: transform .25s ease; }
.btn[aria-expanded="true"] .chev { transform: rotate(180deg); }
.controls { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; align-items: center; }
.check { display: inline-flex; align-items: center; gap: .5rem; font-size: .95rem; cursor: pointer; }
.check input { width: 1.1rem; height: 1.1rem; accent-color: var(--terra-text); }

.compare-panel { margin-top: 1.75rem; }
.table-wrap { overflow-x: auto; border-top: 1px solid var(--ink); }
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
caption { text-align: left; font-size: .9rem; color: var(--ink-2); padding: .75rem 0; caption-side: bottom; }
th, td { text-align: left; padding: .7rem .75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { font: 600 .78rem/1.3 var(--sans); letter-spacing: .05em; text-transform: uppercase; color: var(--ink-2); border-bottom: 1px solid var(--ink); }
td.num, th.num { font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.differs { background: rgba(236, 211, 196, .45); }
tr.differs td.delta { color: var(--terra-text); font-weight: 600; }
tfoot td { font-weight: 600; border-bottom: 1px solid var(--ink); }
.only-diff tr.same { display: none; }
.why { font-size: .9rem; color: var(--ink-2); }

/* ---------- R12 explorer ---------- */
.tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.5rem 0 0; border-bottom: 1px solid var(--ink); }
.tabs [role="tab"] {
  font: 600 .92rem/1 var(--sans); background: transparent; color: var(--ink-2); border: 1px solid transparent;
  border-bottom: 0; padding: .8rem 1rem; cursor: pointer; border-radius: 4px 4px 0 0; margin-bottom: -1px;
}
.tabs [role="tab"][aria-selected="true"] { background: var(--paper); color: var(--ink); border-color: var(--ink); border-bottom: 1px solid var(--paper); }
.tabpanel { background: var(--paper); border: 1px solid var(--ink); border-top: 0; padding: 1.5rem; }
.no-js .tabs { display: none; }
.no-js .tabpanel { border-top: 1px solid var(--ink); margin-top: 1rem; }
.label {
  display: inline-block; font: 600 .72rem/1.4 var(--sans); letter-spacing: .07em; text-transform: uppercase;
  padding: .2rem .55rem; border-radius: 3px; margin-bottom: .75rem;
}
.label.orig { background: var(--ink); color: var(--paper); }
.label.expl { background: var(--terra-soft); color: var(--terra-text); }
blockquote.original {
  margin: 0 0 1.25rem; padding: 1rem 1.25rem; background: var(--ivory); border-left: 3px solid var(--ink);
  font-family: var(--serif); font-size: 1.08rem; line-height: 1.55; max-width: 44rem;
}
blockquote.original p { margin: 0 0 .6rem; }
blockquote.original p:last-child { margin: 0; }
blockquote.original cite { display: block; font: .82rem/1.4 var(--sans); color: var(--ink-3); font-style: normal; margin-top: .6rem; }
mark { background: var(--terra-soft); color: inherit; padding: 0 .15em; border-bottom: 2px solid var(--terra); }

/* ---------- perspectives ---------- */
.three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 2rem; }
.three .panel { display: flex; flex-direction: column; }
.three svg { width: 88px; height: 88px; margin-bottom: 1rem; }
.three h3 { font-size: 1.25rem; }
.three dl { margin: 0; font-size: .95rem; }
.three dt { font: 600 .74rem/1.3 var(--sans); letter-spacing: .07em; text-transform: uppercase; color: var(--ink-2); margin-top: .9rem; }
.three dd { margin: .3rem 0 0; }
@media (max-width: 860px) { .three { grid-template-columns: 1fr; } }

/* ---------- expanders ---------- */
details { border-top: 1px solid var(--line); max-width: 52rem; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; padding: 1rem 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-family: var(--serif); font-size: 1.4rem; line-height: 1; color: var(--terra-text); }
details[open] summary::after { content: "−"; }
details > div { padding: 0 0 1.25rem; }
.expanders { margin-top: 2rem; }

/* ---------- status ---------- */
.status-grid { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: .5rem; margin: 2rem 0 1rem; max-width: 46rem; }
.pkg { border: 1px solid var(--ink); border-radius: 4px; padding: .65rem .4rem; text-align: center; background: var(--paper); font-size: .85rem; }
.pkg b { display: block; font-family: var(--serif); font-size: 1.1rem; font-weight: 500; }
.pkg.done { background: var(--sage); }
.pkg .st { font-size: .72rem; color: var(--ink-2); }
@media (max-width: 620px) { .status-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.legend { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; font-size: .88rem; color: var(--ink-2); margin-bottom: 1.5rem; }
.legend span::before { content: ""; display: inline-block; width: .8rem; height: .8rem; border: 1px solid var(--ink); margin-right: .4rem; vertical-align: -1px; border-radius: 2px; background: var(--paper); }
.legend .l-done::before { background: var(--sage); }

/* ---------- future ---------- */
.future { list-style: none; padding: 0; margin: 2rem 0 0; max-width: 52rem; }
.future li { display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem; padding: 1.1rem 0; border-top: 1px solid var(--line); }
.future li:last-child { border-bottom: 1px solid var(--line); }
.tag-proposed { font: 600 .7rem/1.4 var(--sans); letter-spacing: .07em; text-transform: uppercase; color: var(--terra-text); border: 1px solid var(--terra-text); border-radius: 999px; padding: .2rem .6rem; align-self: start; justify-self: start; }
.future h3 { font-size: 1.15rem; margin-bottom: .3rem; }
.future p { margin: 0; font-size: .97rem; }
@media (max-width: 520px) { .future li { grid-template-columns: 1fr; gap: .4rem; } }

/* ---------- read further ---------- */
.links { list-style: none; padding: 0; margin: 2rem 0 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 2.5rem; max-width: 56rem; }
.links li { border-top: 1px solid var(--line); }
.links a { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem 0; text-decoration: none; color: var(--ink); }
.links a:hover .t { color: var(--terra-text); text-decoration: underline; }
.links .t { font-family: var(--serif); font-size: 1.15rem; }
.links .d { display: block; font-size: .88rem; color: var(--ink-3); margin-top: .15rem; }
.links .arr { color: var(--terra-text); }
@media (max-width: 620px) { .links { grid-template-columns: 1fr; } }

footer { max-width: 76rem; margin: 0 auto; padding: 2rem var(--gutter) 3rem; border-top: 1px solid var(--ink); font-size: .88rem; color: var(--ink-2); }
footer p { max-width: 60rem; }

.future-head svg { max-width: 26rem; justify-self: end; width: 100%; }
@media (max-width: 860px) { .future-head svg { justify-self: start; } }

@media (max-width: 620px) {
  .topbar { flex-direction: column; align-items: flex-start; gap: .6rem; }
  .tabs { flex-wrap: nowrap; overflow-x: auto; }
  .tabs [role="tab"] { white-space: nowrap; }
  #score-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  #score-table, #score-table tbody, #score-table tfoot, #score-table tr, #score-table th, #score-table td { display: block; width: 100%; }
  #score-table tr { border-bottom: 1px solid var(--line); padding: .75rem 0; }
  #score-table th[scope="row"] { border: 0; padding: .25rem .5rem; font-family: var(--serif); font-size: 1.05rem; font-weight: 500; }
  #score-table td { border: 0; padding: .2rem .5rem; display: grid; grid-template-columns: 9.5rem 1fr; gap: .5rem; white-space: normal; }
  #score-table td::before { content: attr(data-label); font-size: .8rem; color: var(--ink-3); }
  .only-diff tr.same { display: none !important; }
  #score-table caption { display: block; width: 100%; padding: 0 0 .75rem; }
}