/* Agents Collab — lab notebook styles. No external fonts or services. */

:root {
  --paper: #f7f2e8;
  --paper-deep: #efe7d8;
  --ink: #1f1c18;
  --ink-soft: #4a443c;
  --rule: #d6cbb6;
  --evergreen: #2c5a4c;
  --evergreen-soft: #e3ebe5;
  --rust: #9c4426;
  --rust-soft: #f3e2d7;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --measure: 40rem;
  --wide: 58rem;
}

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.6;
}

/* Faint notebook ruling in the page margin only, purely decorative. */
body::before {
  content: "";
  position: fixed;
  inset: 0 auto 0 0;
  width: 0.5rem;
  background: repeating-linear-gradient(var(--rust-soft) 0 2px, transparent 2px 1.6rem);
  opacity: 0.7;
  pointer-events: none;
}

a { color: var(--evergreen); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--rust); }
:focus-visible { outline: 3px solid var(--rust); outline-offset: 3px; border-radius: 2px; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 0.9rem;
  z-index: 10;
  font-family: var(--mono);
  font-size: 0.9rem;
}
.skip-link:focus { top: 1rem; color: var(--paper); }

/* Header and navigation ------------------------------------------------- */

.site-header {
  border-bottom: 1px solid var(--rule);
  padding: 1.25rem 1.25rem 0.9rem;
}
.site-header .inner {
  max-width: var(--wide);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem 2rem;
}
.wordmark {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.wordmark span {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.2rem;
  font-family: var(--mono);
  font-size: 0.88rem;
}
.site-nav a { color: var(--ink-soft); text-decoration: none; padding: 0.25rem 0; display: inline-block; }
.site-nav a:hover { color: var(--rust); text-decoration: underline; }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom: 2px solid var(--rust); }

/* Layout ----------------------------------------------------------------- */

main { padding: 2.5rem 1.25rem 4rem; }
.page { max-width: var(--measure); margin: 0 auto; }
.wide { max-width: var(--wide); margin-left: auto; margin-right: auto; }

h1, h2, h3 { line-height: 1.18; font-weight: 700; color: var(--ink); }
h1 { font-size: clamp(2.2rem, 5.5vw, 3.4rem); margin: 0.2rem 0 1rem; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); margin: 3rem 0 0.75rem; }
h3 { font-size: 1.2rem; margin: 2rem 0 0.5rem; }
h2 .num {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--rust);
  display: block;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
}

p, ul, ol { margin: 0 0 1rem; }
li { margin-bottom: 0.35rem; }
strong { font-weight: 700; }

.kicker, .meta {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.lede { font-size: 1.3rem; line-height: 1.5; color: var(--ink-soft); }

hr { border: 0; border-top: 1px solid var(--rule); margin: 3rem 0; }

/* Margin notes, status and cautions ------------------------------------- */

.note {
  border-left: 4px solid var(--rust);
  background: var(--rust-soft);
  padding: 0.9rem 1.1rem;
  margin: 1.5rem 0;
  font-size: 1rem;
}
.note.green { border-left-color: var(--evergreen); background: var(--evergreen-soft); }
.note p:last-child, .note ul:last-child { margin-bottom: 0; }
.note .label {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.3rem;
  color: var(--rust);
}
.note.green .label { color: var(--evergreen); }

.limits { list-style: none; padding: 0; }
.limits li {
  padding: 0.65rem 0 0.65rem 1.6rem;
  border-bottom: 1px dotted var(--rule);
  position: relative;
}
.limits li::before {
  content: "≠";
  position: absolute;
  left: 0;
  top: 0.6rem;
  font-family: var(--mono);
  color: var(--rust);
  font-weight: 700;
}

/* Links to continue reading --------------------------------------------- */

.next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.6rem;
  margin: 2rem 0 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.95rem;
}
.next-links a::after { content: " →"; }
.next-links.cta { border-top: 0; margin-top: 0; padding-top: 0; font-size: 1.05rem; }

/* Boundary diagram ------------------------------------------------------- */

.boundary {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0 1.2rem;
  margin: 1.5rem 0 0.5rem;
}
.boundary figure, .boundary .side { margin: 0; }
.side {
  padding: 1rem 1.1rem;
  border: 1px solid var(--rule);
  background: #fffdf8;
}
.side h3 { margin: 0 0 0.2rem; font-size: 1.1rem; }
.side .where { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-soft); margin-bottom: 0.6rem; word-break: break-word; }
.side ul { margin: 0; padding-left: 1.1rem; font-size: 1rem; }
.side.shared { border-top: 4px solid var(--evergreen); }
.side.private { border-top: 4px solid var(--rust); background: var(--paper-deep); }
.divider {
  border-left: 2px dashed var(--ink-soft);
  position: relative;
  min-height: 100%;
}
.divider span {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-90deg);
  background: var(--paper);
  padding: 0 0.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink-soft);
}
.boundary-caption { font-size: 0.95rem; color: var(--ink-soft); margin-top: 0.6rem; }

@media (max-width: 44rem) {
  .boundary { grid-template-columns: 1fr; gap: 0; }
  .divider { border-left: 0; border-top: 2px dashed var(--ink-soft); min-height: 0; margin: 1.4rem 0; }
  .divider span { transform: translate(-50%, -50%); }
}

/* Code -------------------------------------------------------------------- */

code, kbd, samp { font-family: var(--mono); font-size: 0.88em; }
:not(pre) > code { background: var(--paper-deep); padding: 0.08em 0.3em; border-radius: 3px; overflow-wrap: anywhere; }

.code-block { position: relative; margin: 1rem 0 1.4rem; }
.code-block .code-label {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  margin: 0 0 0.25rem;
}
pre {
  margin: 0;
  background: #22201c;
  color: #f3ecdf;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  line-height: 1.5;
  font-size: 0.9rem;
  border-radius: 3px;
  tab-size: 2;
}
pre code { font-size: inherit; }
.copy-button {
  position: absolute;
  top: 1.65rem;
  right: 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--rule);
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  cursor: pointer;
}
.copy-button:hover { background: var(--rust-soft); }

/* Tables ------------------------------------------------------------------ */

.table-wrap { overflow-x: auto; margin: 1rem 0 1.5rem; }
.table-wrap:focus-visible { outline-offset: 2px; }
table { border-collapse: collapse; width: 100%; font-size: 0.98rem; min-width: 30rem; }
caption {
  text-align: left;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  padding-bottom: 0.4rem;
  letter-spacing: 0.04em;
}
th, td { padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--rule); vertical-align: top; text-align: left; }
thead th { border-bottom: 2px solid var(--ink); font-size: 0.9rem; }
td.num, th.num { text-align: right; font-family: var(--mono); font-size: 0.88rem; white-space: nowrap; }
tbody tr:hover { background: rgba(255, 253, 248, 0.7); }

/* Verdict stamp ----------------------------------------------------------- */

.stamp {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rust);
  border: 2px solid var(--rust);
  padding: 0.2rem 0.55rem;
  transform: rotate(-1.5deg);
  margin: 0.2rem 0 1rem;
}

/* Timeline ---------------------------------------------------------------- */

.timeline { list-style: none; padding: 0; margin: 1.5rem 0; border-left: 2px solid var(--rule); }
.timeline > li { position: relative; padding: 0 0 1.8rem 1.6rem; margin: 0; }
.timeline > li::before {
  content: "";
  position: absolute;
  left: -0.45rem;
  top: 0.45rem;
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--evergreen);
}
.timeline > li.turn::before { border-color: var(--rust); background: var(--rust-soft); }
.timeline .when { font-family: var(--mono); font-size: 0.8rem; color: var(--rust); letter-spacing: 0.04em; }
.timeline h3 { margin: 0.1rem 0 0.4rem; }

/* Home entries list ------------------------------------------------------- */

.entries { list-style: none; padding: 0; margin: 1rem 0; }
.entries li { border-top: 1px solid var(--rule); padding: 1rem 0; margin: 0; }
.entries li:last-child { border-bottom: 1px solid var(--rule); }
.entries a { font-size: 1.25rem; font-weight: 700; }
.entries p { margin: 0.25rem 0 0; color: var(--ink-soft); font-size: 1rem; }
.entries .meta { display: block; margin-bottom: 0.15rem; }

/* Footer ------------------------------------------------------------------ */

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 1.5rem 1.25rem 2.5rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.site-footer .inner { max-width: var(--wide); margin: 0 auto; }
.site-footer p { margin: 0 0 0.4rem; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 30rem) {
  body { font-size: 1.05rem; }
  main { padding-top: 1.75rem; }
  .lede { font-size: 1.15rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}

@media print {
  body::before, .skip-link, .site-nav, .copy-button { display: none; }
  body { background: #fff; }
  pre { background: #fff; color: #000; border: 1px solid #999; white-space: pre-wrap; }
  a { color: #000; }
}