:root {
  color-scheme: light;
  --paper: #f5f3ed;
  --surface: #fbfaf6;
  --surface-soft: #eeece5;
  --ink: #242822;
  --muted: #62675f;
  --line: #cbc9c0;
  --accent: #37654f;
  --accent-soft: #e0ebe4;
  --accent-ink: #244b3a;
  --note: #f1ebd8;
  --note-ink: #5c4b27;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Arial, Helvetica, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 16px/1.65 var(--sans);
}
a { color: var(--accent-ink); text-underline-offset: .2rem; }
a:hover { color: var(--accent); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
h1, h2, h3, p, li { text-wrap: pretty; }

.skip-link {
  position: fixed;
  top: -5rem;
  left: 1rem;
  z-index: 100;
  padding: .65rem .85rem;
  color: white;
  background: var(--ink);
}
.skip-link:focus { top: 1rem; }
.proposal-shell { width: min(980px, calc(100% - 40px)); margin-inline: auto; }

.proposal-nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  font-size: .78rem;
}
.proposal-nav a { font-weight: 700; text-decoration: none; }
.proposal-nav a:hover { text-decoration: underline; }
.status-pill,
.tag {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  padding: .25rem .5rem;
  border: 1px solid var(--line);
  color: var(--accent-ink);
  background: var(--surface);
  font: 700 .68rem/1.3 var(--mono);
}
.status-pill { color: var(--ink); background: var(--accent-soft); }

.proposal-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr);
  gap: 4rem;
  align-items: start;
  padding: 5.5rem 0 4.5rem;
}
.eyebrow,
.section-kicker {
  margin: 0 0 .7rem;
  color: var(--accent-ink);
  font: 700 .72rem/1.3 var(--mono);
  letter-spacing: .07em;
  text-transform: uppercase;
}
h1,
h2 { font-family: var(--serif); font-weight: 400; letter-spacing: -.025em; }
h1 { max-width: 700px; margin: 0; font-size: clamp(3rem, 7vw, 4.8rem); line-height: 1.02; }
.proposal-dek { max-width: 680px; margin: 1.4rem 0 0; color: var(--muted); font-size: 1.06rem; }
.proposal-meta { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1.4rem; }

.system-diagram {
  display: grid;
  gap: 0;
  margin-top: .25rem;
  border: 1px solid var(--line);
  background: var(--surface);
}
.system-diagram::before,
.system-diagram::after,
.mechanism-card::after,
.photo-note::before { display: none; }
.diagram-core {
  padding: 1rem;
  border-bottom: 2px solid var(--accent);
  color: var(--ink);
  background: var(--accent-soft);
  font: 700 .86rem/1.4 var(--sans);
}
.diagram-node {
  position: static;
  max-width: none;
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  font-size: .78rem;
  text-align: left;
}
.diagram-caption { padding: .75rem 1rem; color: var(--muted); font-size: .69rem; }

.disclosure {
  display: grid;
  grid-template-columns: minmax(180px, .55fr) 1.45fr;
  gap: 1.5rem;
  align-items: start;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--note-ink);
  background: var(--note);
}
.disclosure strong { color: var(--note-ink); font-family: var(--serif); font-size: 1.12rem; font-weight: 400; }
.disclosure p { margin: 0; color: var(--muted); font-size: .88rem; }

.visual-notes,
.proposal-section { padding: 5rem 0; border-bottom: 1px solid var(--line); }
.visual-notes-heading,
.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(250px, .95fr);
  gap: 3rem;
  align-items: end;
  margin-bottom: 2rem;
}
.visual-notes-heading h2,
.section-heading h2 { margin: 0; font-size: clamp(2rem, 5vw, 3.25rem); line-height: 1.08; }
.visual-notes-heading > p:last-child,
.section-heading > p { margin: 0; color: var(--muted); }

.photo-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}
.photo-note {
  position: static;
  width: auto;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  transform: none;
}
.photo-note:nth-child(odd),
.photo-note:nth-child(even) { margin-top: 0; transform: none; }
.photo-note img,
.photo-note--portrait img,
.photo-note--diagram img {
  display: block;
  width: 100%;
  height: 22rem;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: var(--surface-soft);
  object-fit: cover;
  filter: none;
}
.photo-note--diagram img { object-fit: contain; }
.photo-note figcaption { display: grid; gap: .3rem; padding: 1rem; }
.photo-note figcaption strong { font: 400 1.15rem/1.3 var(--serif); }
.photo-note figcaption span { color: var(--muted); font-size: .82rem; }
.photo-credit { color: var(--muted); font: .64rem/1.4 var(--mono); }

.boundary-grid,
.mechanism-grid,
.control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.boundary-card,
.mechanism-card,
.control-card {
  min-height: 0;
  padding: 1.25rem;
  border: 1px solid var(--line);
  background: var(--surface);
  transform: none;
}
.boundary-card span,
.mechanism-card span,
.control-card span {
  color: var(--accent-ink);
  font: 700 .68rem/1.3 var(--mono);
  letter-spacing: .05em;
  text-transform: uppercase;
}
.boundary-card h3,
.mechanism-card h3,
.control-card h3 { margin: .65rem 0 .45rem; font: 400 1.3rem/1.2 var(--serif); }
.boundary-card p,
.mechanism-card p,
.control-card p { margin: 0; color: var(--muted); font-size: .89rem; }

.metrics-wrap { overflow-x: auto; border: 1px solid var(--line); background: var(--surface); }
.metrics { width: 100%; border-collapse: collapse; font-size: .84rem; }
.metrics th,
.metrics td { padding: .85rem 1rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.metrics th { color: var(--accent-ink); background: var(--surface-soft); font: 700 .68rem/1.4 var(--mono); text-transform: uppercase; }
.metrics tr:last-child td { border-bottom: 0; }
.metrics td:first-child { width: 22%; font-weight: 700; }

.roadmap {
  display: grid;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
  counter-reset: phase;
}
.roadmap li {
  display: grid;
  grid-template-columns: 3rem minmax(150px, .7fr) 1.3fr;
  gap: 1rem;
  align-items: start;
  min-height: 0;
  padding: 1.1rem 0;
  border-right: 0;
  border-bottom: 1px solid var(--line);
  counter-increment: phase;
}
.roadmap li::before { color: var(--accent-ink); content: "0" counter(phase); font: 700 .7rem/1.6 var(--mono); }
.roadmap h3 { margin: 0; font: 400 1.12rem/1.3 var(--serif); }
.roadmap p { margin: 0; color: var(--muted); font-size: .84rem; }

.references { margin: 0; padding-left: 1.25rem; color: var(--muted); font-size: .82rem; }
.references li { margin-bottom: .8rem; padding-left: .25rem; scroll-margin-top: 1rem; }
.references li:target { outline: 2px solid var(--accent); outline-offset: .3rem; background: var(--accent-soft); }
.inline-citation { color: var(--accent-ink); font-size: .9em; font-weight: 700; }
.source-note {
  margin-top: 1.5rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  color: var(--muted);
  background: var(--surface);
  font-size: .76rem;
}
.proposal-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: .72rem;
}
.proposal-footer p { margin: 0; }
.proposal-footer div { display: flex; gap: 1rem; }

@media (max-width: 760px) {
  .proposal-hero,
  .visual-notes-heading,
  .section-heading,
  .disclosure { grid-template-columns: 1fr; }
  .proposal-hero { gap: 2.5rem; padding: 4rem 0; }
  .boundary-grid,
  .mechanism-grid,
  .control-grid,
  .photo-notes { grid-template-columns: 1fr; }
  .photo-note img,
  .photo-note--portrait img,
  .photo-note--diagram img { height: min(22rem, 78vw); }
  .roadmap li { grid-template-columns: 2.5rem 1fr; }
  .roadmap p { grid-column: 2; }
}

@media (max-width: 520px) {
  .proposal-shell { width: calc(100% - 24px); }
  .proposal-nav .status-pill { display: none; }
  h1 { font-size: clamp(2.55rem, 13vw, 3.6rem); }
  .visual-notes,
  .proposal-section { padding: 4rem 0; }
  .proposal-footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media print {
  .proposal-nav,
  .skip-link { display: none; }
  body { background: white; }
  .proposal-section { break-inside: avoid; }
}