/* Shared stylesheet for the landing page and subpages.
   Font paths are relative to this file (site root). */
:root {
  --ink: #16181d;
  --muted: #565d66;
  --accent: #1e5c3a;            /* the paper's Lean green: accent = formalization */
  --accent-ink: #ffffff;
  --paper: #f6f6f3;
  --card: #ffffff;
  --line: #dcdedb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8e9ec;
    --muted: #9aa1ab;
    --accent: #3f9c6b;
    --accent-ink: #0d1210;
    --paper: #16181c;
    --card: #1e2126;
    --line: #33373d;
  }
}
@font-face {
  font-family: "Computer Modern Serif";
  src: url("paper/fonts/cmunrm.woff") format("woff");
  font-weight: normal; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Computer Modern Serif";
  src: url("paper/fonts/cmunbx.woff") format("woff");
  font-weight: bold; font-style: normal; font-display: swap;
}
*, *::before, *::after { box-sizing: border-box; }
html { background: var(--paper); }
body {
  width: min(68rem, 100%);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1.25rem, 4vw, 3rem) 3rem;
  color: var(--ink);
  font-family: "Computer Modern Serif", Georgia, "Times New Roman", serif;
  line-height: 1.55;
}

/* ---------------- hero ---------------- */
.hero {
  max-width: 62rem;
  margin: 0 auto clamp(3rem, 6vw, 4.5rem);
  text-align: center;
}
h1 {
  max-width: 34ch;
  margin: 0 auto;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.sub { margin: 1.1rem 0 0.9rem; color: var(--muted); font-size: 1.1rem; }
.gist {
  margin: 0 auto 2rem;
  max-width: 56ch;
  font-size: 1.02rem;
}
.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.8rem; }
.actions a {
  padding: 0.75rem 1.25rem;
  border: 1.5px solid var(--accent);
  border-radius: 999px;
  font: 650 0.95rem/1 system-ui, sans-serif;
  text-decoration: none;
  transition: filter .15s ease, background .15s ease;
}
.actions .primary { color: var(--accent-ink); background: var(--accent); }
.actions .primary:hover { filter: brightness(1.12); }
.actions .secondary { color: var(--accent); background: transparent; }
.actions .secondary:hover { background: rgba(40, 160, 90, 0.08); }
.actions a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* --------------- subpage header --------------- */
.page-header { margin-bottom: clamp(2rem, 5vw, 3.5rem); }
.page-header .back {
  font: 650 0.9rem/1 system-ui, sans-serif;
  color: var(--accent);
  text-decoration: none;
}
.page-header .back:hover { text-decoration: underline; }
.page-header h1 {
  margin: 0.9rem 0 0;
  max-width: none;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  text-align: left;
}

/* ---------------- prose sections ---------------- */
.two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(21rem, 1fr));
  column-gap: 3rem;
  align-items: start;
}
.prose { max-width: 66ch; }
.prose p { margin: 0 0 1rem; }
.prose a { color: var(--ink); text-decoration-color: rgba(40, 160, 90, 0.5); }
.prose a:hover { text-decoration-color: var(--accent); }

/* ---------------- resource sections ---------------- */
h2 {
  margin: 2.6rem 0 1rem;
  font: 700 0.78rem/1.2 system-ui, sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1rem;
}
.resource-card {
  padding: 1.3rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: var(--card);
  box-shadow: 0 6px 18px rgba(24, 32, 29, 0.05);
}
.resource-card a.res-title {
  color: var(--ink);
  font-size: 1.12rem;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: rgba(40, 160, 90, 0.5);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.25em;
}
.resource-card a.res-title:hover { text-decoration-color: var(--accent); }
.resource-card p { margin: 0.5rem 0 0; color: var(--muted); font-size: 0.95rem; }
.badge {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.14rem 0.55rem;
  border-radius: 999px;
  vertical-align: 0.12em;
  font: 700 0.66rem/1.4 system-ui, sans-serif;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  background: rgba(40, 160, 90, 0.08);
}
.res-title-soon { color: var(--ink); font-size: 1.12rem; font-weight: 700; }
.card-heading,
.stage-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.55rem;
}
.card-heading .badge,
.stage-heading .badge { margin-left: 0; }
.section-intro {
  max-width: 66ch;
  color: var(--muted);
}
.stage-list {
  margin-top: 1rem;
  border-top: 1px solid var(--line);
}
.stage {
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
}
.stage:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.stage-title {
  color: var(--ink);
  font-weight: 700;
}
a.stage-title {
  text-decoration: underline;
  text-decoration-color: rgba(40, 160, 90, 0.5);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.25em;
}
a.stage-title:hover { text-decoration-color: var(--accent); }
.stage p { font-size: 0.91rem; }

footer {
  margin-top: 3.2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { color: var(--ink); text-decoration-color: rgba(40,160,90,.5); }
footer .pf-credit { white-space: nowrap; }
footer .pf-glyph {
  width: 1.15em;
  height: 1.15em;
  margin-right: 0.25em;
  vertical-align: -0.22em;
}