:root {
  --ink: #1c1917;
  --muted: #57534e;
  --faint: #a8a29e;
  --line: #e7e5e4;
  --bg: #ffffff;
  --soft: #fafaf9;
  --link: #1c1917;
  --max: 72rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Georgia, "Iowan Old Style", Palatino, "Palatino Linotype", serif;
  font-size: 1.125rem;
  line-height: 1.65;
}

a { color: var(--link); }

.wrap {
  width: min(var(--max), calc(100% - 2.5rem));
  margin: 0 auto;
}

header.site {
  position: sticky;
  top: 0;
  z-index: 2;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

header.site .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.92rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.82rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 0.2rem;
  border-bottom: 2px solid transparent;
}
nav a[aria-current="page"],
nav a:hover { color: var(--ink); }
nav a[aria-current="page"] { border-bottom-color: var(--ink); }

main { padding: 1.75rem 0 3rem; }

h1 {
  font-size: 2.15rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 0.75rem;
}

.kicker,
.meta,
.rank,
.mode,
.jump,
footer.site,
.read {
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.kicker {
  margin: 0 0 0.45rem;
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.lede,
.issue-intro {
  color: var(--muted);
  margin: 0;
  max-width: 42rem;
}

.issue-head { margin-bottom: 1.1rem; }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.1rem;
}

.filters button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  min-height: 44px;
  padding: 0 1rem;
  border-radius: 999px;
  cursor: pointer;
}

.filters button[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.trail {
  list-style: none;
  margin: 0;
  padding: 0;
}

.trail-item {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr) auto;
  gap: 0.15rem 1.1rem;
  align-items: start;
  padding: 1.15rem 0.2rem 1.2rem;
  border-bottom: 1px solid var(--line);
}

.trail-item[data-rank="lead"] {
  background: #f6f5f2;
  border: 0;
  border-radius: 16px;
  padding: 1.35rem 1.15rem 1.45rem;
  margin-bottom: 0.25rem;
}

.trail-rail .rank {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  margin: 0.05rem 0 0;
  border: 1.5px solid #d6d3d1;
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
}

.trail-item[data-rank="lead"] .trail-rail .rank {
  width: 2rem;
  height: 2rem;
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
  font-size: 0.9rem;
}

.trail-item[data-rank="next"] .trail-rail .rank {
  border-color: #44403c;
}

.trail-copy {
  min-width: 0;
  padding-left: 0.9rem;
  border-left: 3px solid #d6d3d1;
}

.trail-item[data-cat="new-tech"] .trail-copy { border-left-color: #0f766e; }
.trail-item[data-cat="parents-teachers"] .trail-copy { border-left-color: #c2410c; }
.trail-item[data-cat="school"] .trail-copy { border-left-color: #1d4ed8; }
.trail-item[data-cat="workshops"] .trail-copy { border-left-color: #b45309; }
.trail-item[data-cat="investments"] .trail-copy { border-left-color: #3f6212; }
.trail-item[data-cat="research"] .trail-copy { border-left-color: #6d28d9; }
.trail-item[data-cat="rules"] .trail-copy { border-left-color: #44403c; }

.trail-item[data-cat="new-tech"] .kicker { color: #0f766e; }
.trail-item[data-cat="parents-teachers"] .kicker { color: #9a3412; }
.trail-item[data-cat="school"] .kicker { color: #1e3a8a; }
.trail-item[data-cat="workshops"] .kicker { color: #92400e; }
.trail-item[data-cat="investments"] .kicker { color: #3f6212; }
.trail-item[data-cat="research"] .kicker { color: #5b21b6; }
.trail-item[data-cat="rules"] .kicker { color: #44403c; }

.trail-item h2 {
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin: 0 0 0.35rem;
  font-size: 1.12rem;
}

.trail-item[data-rank="lead"] h2 { font-size: 2rem; }
.trail-item[data-rank="next"] h2 { font-size: 1.42rem; }

.trail-item h2 a { color: var(--ink); text-decoration: none; }
.trail-item h2 a:hover { text-decoration: underline; text-underline-offset: 0.14em; }

.trail-item .summary { margin-bottom: 0; }

.trail-item[data-rank="lead"] .summary { font-size: 1.0625rem; }

.trail-item .read {
  width: auto;
  min-width: 9.5rem;
  min-height: 46px;
  margin-top: 0.15rem;
  padding: 0.7rem 0.95rem;
  font-size: 0.95rem;
}

.trail-item[data-rank="lead"] .read {
  min-width: 15rem;
  min-height: 52px;
  font-size: 1.05rem;
}

.piece {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-width: 0;
  padding: 0.95rem 1rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.rank {
  margin-right: 0.4rem;
  font-size: 0.72rem;
  color: var(--faint);
}

.piece h2,
.piece h3 {
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin: 0 0 0.35rem;
}

.piece h2 a,
.piece h3 a { text-decoration: none; }
.piece h2 a:hover,
.piece h3 a:hover { text-decoration: underline; text-underline-offset: 0.14em; }

.piece h2 { font-size: 1.2rem; }

.meta {
  margin: 0 0 0.45rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.summary {
  margin: 0 0 0.85rem;
  color: #44403c;
  font-size: 1rem;
  line-height: 1.5;
}

.read {
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  width: 100%;
  min-height: 52px;
  margin-top: auto;
  padding: 0.85rem 1.1rem;
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
}

.read:hover { background: #292524; }

.empty {
  color: var(--muted);
  margin: 0.2rem 0 0;
}

.archive-list { list-style: none; padding: 0; margin: 1.25rem 0 0; }
.archive-list li { border-top: 1px solid var(--line); }
.archive-list a {
  display: block;
  padding: 0.95rem 0;
  color: var(--ink);
  text-decoration: none;
}
.archive-list a:hover h2 { text-decoration: underline; text-underline-offset: 0.12em; }
.archive-list h2 {
  font-size: 1.25rem;
  font-weight: 500;
  margin: 0;
}
.archive-list small {
  display: block;
  margin-top: 0.2rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
  color: var(--muted);
  font-size: 0.82rem;
}

.source {
  padding: 1.05rem 0 1.15rem;
  border-top: 1px solid var(--line);
}

.source h3 {
  font-size: 1.15rem;
  font-weight: 500;
  margin: 0;
}

.source h3 a { text-decoration: none; }
.source h3 a:hover { text-decoration: underline; text-underline-offset: 0.12em; }

.source p { margin: 0.3rem 0 0; }

.sources-page h2 {
  font-size: 1.35rem;
  font-weight: 500;
  margin: 2.2rem 0 0.3rem;
}

footer.site {
  border-top: 1px solid var(--line);
  padding: 1.2rem 0 2rem;
  font-size: 0.78rem;
  color: var(--faint);
}

@media (max-width: 800px) {
  .trail-item,
  .trail-item[data-rank="lead"] {
    grid-template-columns: 2.25rem minmax(0, 1fr);
  }

  .trail-item[data-rank="lead"] h2 { font-size: 1.6rem; }

  .trail-item .read {
    grid-column: 1 / -1;
    width: 100%;
    margin-top: 0.7rem;
  }
}