/* cora — project page.
   One aesthetic commitment: a typeset engineering spec on warm paper.
   Ink monochrome throughout; the only chroma on the page is cora's own
   verdict vocabulary (green / amber / red). Newsreader for prose,
   IBM Plex Mono for everything machine-shaped. */

:root {
  --paper: #f6f2ea;
  --paper-deep: #efe9dd;
  --ink: #1c1a17;
  --ink-soft: #57524a;
  --ink-faint: #8a8478;
  --rule: #d8d1c2;
  --verdict-g: #1a7f37;
  --verdict-y: #9a6700;
  --verdict-r: #c1331d;
  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(154, 103, 0, 0.05), transparent 60%),
    var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.55;
  font-feature-settings: "liga", "kern";
  -webkit-font-smoothing: antialiased;
}

/* faint paper grain */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.03 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

header, nav, main, footer { position: relative; z-index: 2; }

a { color: inherit; text-decoration-color: var(--ink-faint); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--ink); }

code {
  font-family: var(--mono);
  font-size: 0.78em;
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.08em 0.35em;
  white-space: nowrap;
}

/* ---------- layout: spec page with a generous left margin ---------- */

header.masthead, nav.toc, main section, footer.colophon {
  max-width: 46rem;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ---------- masthead ---------- */

header.masthead { padding-top: 5rem; }

.masthead-rule {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-top: 2px solid var(--ink);
  padding-top: 0.7rem;
}
.dot { width: 9px; height: 9px; border-radius: 50%; }
.dot.g { background: var(--verdict-g); }
.dot.y { background: var(--verdict-y); }
.dot.r { background: var(--verdict-r); }

.wordmark {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(3.2rem, 9vw, 5.4rem);
  letter-spacing: -0.04em;
  margin: 1.2rem 0 0;
  line-height: 1;
}
.wordmark::after { content: "_"; color: var(--verdict-g); animation: caret 1.2s steps(1) infinite; }
@keyframes caret { 50% { opacity: 0; } }

.tagline {
  font-style: italic;
  font-size: 1.35rem;
  color: var(--ink-soft);
  margin: 0.6rem 0 0;
}

.masthead-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}
.masthead-meta .sep { color: var(--ink-faint); }
.chip {
  border: 1px solid var(--verdict-y);
  color: var(--verdict-y);
  border-radius: 999px;
  padding: 0.1rem 0.6rem;
  letter-spacing: 0.05em;
}

.abstract {
  margin-top: 2.2rem;
  font-size: 1.22rem;
  line-height: 1.6;
  border-left: 2px solid var(--rule);
  padding-left: 1.2rem;
}

/* ---------- toc ---------- */

nav.toc {
  margin-top: 3rem;
  font-family: var(--mono);
  font-size: 0.82rem;
}
.toc-label {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  font-size: 0.68rem;
}
nav.toc ol {
  margin: 0.6rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
  border-top: 1px solid var(--rule);
}
nav.toc li {
  counter-increment: toc;
  border-bottom: 1px solid var(--rule);
}
nav.toc li a {
  display: flex;
  gap: 1rem;
  padding: 0.55rem 0.2rem;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 120ms ease, padding-left 120ms ease;
}
nav.toc li a::before { content: "§" counter(toc); color: var(--ink-faint); }
nav.toc li a:hover { color: var(--ink); padding-left: 0.6rem; }

/* ---------- sections ---------- */

main section { margin-top: 5rem; scroll-margin-top: 2rem; }

h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.9rem;
  letter-spacing: -0.01em;
  border-top: 2px solid var(--ink);
  padding-top: 0.8rem;
  margin: 0 0 1.2rem;
}
.sec-no {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink-faint);
  vertical-align: 0.45em;
  margin-right: 0.7rem;
}

p { margin: 1.1rem 0; }
em { font-style: italic; }

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

figure { margin: 1.8rem 0; }
figcaption {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin-top: 0.7rem;
  letter-spacing: 0.02em;
}

.diagram pre, .code pre {
  font-family: var(--mono);
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.3rem 1.4rem;
  overflow-x: auto;
  margin: 0;
}
.diagram pre {
  font-size: 0.74rem;
  line-height: 1.5;
  color: var(--ink-soft);
}

.code pre { font-size: 0.82rem; line-height: 1.6; }
.code .kw { color: var(--verdict-r); }
.code .cm { color: var(--ink-faint); font-style: italic; }

/* ---------- modes list ---------- */

dl.modes { margin: 1.6rem 0; border-top: 1px solid var(--rule); }
dl.modes > div {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1.2rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
}
dl.modes dt { font-family: var(--mono); font-weight: 600; font-size: 0.95rem; }
dl.modes dt code { background: none; border: none; padding: 0; font-size: 1em; }
dl.modes dd { margin: 0; color: var(--ink-soft); font-size: 0.98em; }

/* ---------- tables ---------- */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6rem 0;
  font-size: 0.92em;
}
th {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  text-align: left;
  padding: 0 0.8rem 0.5rem 0;
  border-bottom: 2px solid var(--ink);
}
td {
  padding: 0.75rem 0.8rem 0.75rem 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  color: var(--ink-soft);
}
td:first-child { color: var(--ink); }

.vocab .v { font-family: var(--mono); font-size: 0.84em; white-space: nowrap; }
.vocab .v.g { color: var(--verdict-g); }
.vocab .v.y { color: var(--verdict-y); }
.vocab .v.r { color: var(--verdict-r); }
.vocab .v.n { color: var(--ink-faint); }
.vocab td.ok, .vocab td.bad { font-family: var(--mono); font-size: 0.8em; }
.vocab td.ok { color: var(--verdict-g); }
.vocab td.bad { color: var(--verdict-r); }

.f-blocker { color: var(--verdict-r); font-weight: 600; }
.f-concern { color: var(--verdict-y); font-weight: 600; }

/* ---------- sample review comment ---------- */

.comment-card { margin: 2rem 0; }
.comment-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  padding: 0.6rem 1rem;
}
.avatar {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.7rem;
}
.comment-author { font-weight: 600; }
.comment-meta { color: var(--ink-faint); }

.comment-body {
  border: 1px solid var(--rule);
  border-radius: 0 0 6px 6px;
  padding: 1rem 1.4rem 1.2rem;
  background: #fbf8f2;
  box-shadow: 4px 4px 0 var(--paper-deep);
}
.comment-marker {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
  margin: 0 0 0.4rem;
}
.comment-body h3 {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0.2rem 0 0.8rem;
}
.comment-body ul { margin: 0; padding-left: 1.2rem; }
.comment-body li { margin: 0.6rem 0; font-size: 0.95em; color: var(--ink-soft); }
.comment-foot {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
  border-top: 1px solid var(--rule);
  margin: 1rem 0 0;
  padding-top: 0.7rem;
}

/* ---------- footer ---------- */

footer.colophon {
  margin-top: 6rem;
  padding-bottom: 5rem;
  font-size: 0.95em;
  color: var(--ink-soft);
}
footer.colophon .masthead-rule { margin-bottom: 1.6rem; }
.fineprint {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  margin-top: 2.4rem;
}

/* ---------- load reveal ---------- */

@media (prefers-reduced-motion: no-preference) {
  .reveal { animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) both; }
  .reveal:nth-of-type(1) { animation-delay: 0.05s; }
  header.masthead { animation-delay: 0s; }
  nav.toc { animation-delay: 0.12s; }
  main section:nth-of-type(1) { animation-delay: 0.2s; }
  main section:nth-of-type(2) { animation-delay: 0.28s; }
  main section:nth-of-type(3) { animation-delay: 0.34s; }
  main section:nth-of-type(4) { animation-delay: 0.4s; }
  main section:nth-of-type(5) { animation-delay: 0.46s; }
  footer.colophon { animation-delay: 0.52s; }
  @keyframes rise {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: none; }
  }
}

/* ---------- small screens ---------- */

@media (max-width: 560px) {
  body { font-size: 17px; }
  dl.modes > div { grid-template-columns: 1fr; gap: 0.3rem; }
  .diagram pre { font-size: 0.6rem; }
}