/* ============================================================
   READING — curated reading list
   Builds on the .ep-* shell (energy-primer.css). Adds the
   two-column layout, sticky topic rail, and source rows.
   ============================================================ */

/* layout: sticky topic rail + the list */
.rd-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
  margin-top: 8px;
}

/* left rail */
.rd-nav {
  position: sticky;
  top: 16px;
  align-self: start;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  font-family: var(--ep-mono);
}
.rd-nav-title {
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--ep-ink-mute);
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ep-rule);
}
.rd-nav-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.rd-nav-link {
  display: grid;
  grid-template-columns: 24px 1fr auto;
  gap: 8px;
  align-items: start;
  padding: 8px 0;
  border-bottom: 1px solid var(--ep-rule-soft);
  text-decoration: none;
  color: var(--ep-ink-dim);
  line-height: 1.35;
}
.rd-nav-link:hover { color: var(--ep-ink); }
.rd-nav-link.is-active .rd-nav-num { color: var(--ep-accent); }
.rd-nav-num {
  font-size: 11px;
  font-weight: 700;
  color: var(--ep-ink-mute);
  letter-spacing: 0.12em;
}
.rd-nav-name {
  font-family: var(--ep-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--ep-ink);
  letter-spacing: -0.005em;
}
.rd-nav-link.is-active .rd-nav-name { color: var(--ep-accent); font-weight: 600; }
.rd-nav-count {
  font-size: 10px;
  color: var(--ep-ink-mute);
  font-weight: 600;
}

/* the list body */
.rd-body { min-width: 0; }

.rd-cat {
  padding-top: 30px;
  margin-top: 30px;
  border-top: 1px solid var(--ep-rule);
  scroll-margin-top: 24px;
}
.rd-cat:first-child { border-top: 0; margin-top: 0; padding-top: 8px; }

.rd-cat-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 6px;
}
.rd-cat-num {
  font-family: var(--ep-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--ep-accent);
}
.rd-cat-title {
  font-family: var(--ep-serif);
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.014em;
  color: var(--ep-ink);
  margin: 0;
  font-variation-settings: "opsz" 32;
}
.rd-cat-count {
  margin-left: auto;
  font-family: var(--ep-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--ep-ink-mute);
  white-space: nowrap;
}
.rd-cat-note {
  font-family: var(--ep-serif);
  font-style: italic;
  font-size: 15px;
  color: var(--ep-ink-dim);
  margin: 0 0 16px;
}

/* source rows */
.rd-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}
.rd-item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-top: 1px solid var(--ep-rule-soft);
}
.rd-item:first-child { border-top: 0; }
.rd-item-num {
  font-family: var(--ep-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ep-ink-mute);
  letter-spacing: 0.08em;
  padding-top: 2px;
}
.rd-item-body { min-width: 0; }
.rd-item-title {
  font-family: var(--ep-sans);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ep-ink);
  letter-spacing: -0.008em;
  text-decoration: none;
  line-height: 1.35;
  display: inline;
}
.rd-item-title:hover { color: var(--ep-accent); }
.rd-item-ext {
  font-size: 11px;
  margin-left: 6px;
  color: var(--ep-ink-mute);
  font-weight: 400;
}
.rd-item-title:hover .rd-item-ext { color: var(--ep-accent); }
.rd-item-note {
  font-family: var(--ep-serif);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ep-ink-dim);
  margin: 5px 0 0;
  font-variation-settings: "opsz" 15;
}
.rd-item-time {
  font-family: var(--ep-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--ep-ink-mute);
  white-space: nowrap;
  border: 1px solid var(--ep-rule);
  padding: 3px 8px;
  text-align: right;
}

.rd-cat-foot {
  margin: 18px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--ep-rule-soft);
  font-family: var(--ep-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ep-ink-mute);
}

/* responsive */
@media (max-width: 980px) {
  .rd-layout { grid-template-columns: minmax(0, 1fr); }
  .rd-nav { display: none; }
}
@media (max-width: 640px) {
  .rd-item { grid-template-columns: 22px minmax(0, 1fr); }
  .rd-item-time {
    grid-column: 2;
    justify-self: start;
    margin-top: 8px;
  }
  .rd-cat-count { display: none; }
}