/* Lesson 02 · Beneath the Vault
   Reading system lives in ../lesson-reading.css.
   Only lesson-specific pieces belong here. */



.page-currency-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(230px, 280px);
  gap: clamp(2rem, 6vw, 4rem);
  align-items: start;
  margin: 0 0 2.5rem;
}



.page-currency-layout > div > p {
  margin: 0 0 1.3rem;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.8vw, 1.2rem);
  line-height: 1.85;
}



.page-currency-layout > div > p:last-child {
  margin-bottom: 0;
}



.rows-to-pages {
  padding-left: 1.25rem;
  border-left: 1px solid var(--line);
}



.rows-to-pages > p:first-child {
  margin: 0 0 0.8rem;
  color: var(--jade);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}



.rows-to-pages > div {
  display: grid;
  gap: 0.2rem;
  padding: 0.8rem 0.9rem;
  border-top: 1px solid var(--line);
}



.rows-to-pages > div:last-of-type {
  border-bottom: 1px solid var(--line);
}



.rows-to-pages span,
.rows-to-pages small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}



.rows-to-pages strong {
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.25rem;
}



.rows-to-pages .requested-page {
  border-left: 2px solid var(--moss);
  background: color-mix(in srgb, var(--moss) 7%, transparent);
}



.rows-to-pages .visual-result {
  margin: 1rem 0 0.6rem;
  color: var(--text);
  font-weight: 800;
  line-height: 1.45;
}



.request-paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 2.5rem 0;
}



.request-paths section {
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}



.request-paths section + section {
  padding: 2rem;
  border-left: 1px solid var(--line);
}



.path-label {
  margin: 0 0 0.7rem;
  color: var(--jade);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}



.request-paths h3 {
  margin: 0 0 1.3rem;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.15;
}



.request-paths ol {
  margin: 0 0 1.4rem;
  padding-left: 1.3rem;
  color: var(--muted);
}



.request-paths li {
  margin-bottom: 0.8rem;
  padding-left: 0.3rem;
  line-height: 1.65;
}



.request-paths section > p:last-child {
  margin-bottom: 0;
  line-height: 1.55;
}

.request-route,
.working-set-visual {
  max-width: 960px;
  margin: 2.2rem 0 2.5rem;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}

.request-route {
  display: grid;
  grid-template-columns: minmax(120px, 0.7fr) auto minmax(120px, 0.7fr) minmax(260px, 1.5fr);
  gap: 0.8rem;
  align-items: stretch;
}

.request-route figcaption,
.working-set-visual figcaption {
  grid-column: 1 / -1;
  margin-bottom: 0.35rem;
  color: var(--jade);
  font: 800 0.84rem/1.35 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.route-origin,
.route-lookup,
.route-branches > div {
  display: grid;
  align-content: center;
  gap: 0.35rem;
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--bg-soft);
}

.request-route span,
.working-set-visual small,
.working-set-visual em,
.eviction-note span {
  color: var(--muted);
  font: 800 0.68rem/1.3 var(--mono);
  font-style: normal;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.request-route strong,
.eviction-note strong {
  color: var(--text);
  line-height: 1.35;
}

.route-arrow,
.working-arrow {
  align-self: center;
  color: var(--jade);
  font-family: var(--mono);
}

.route-branches {
  display: grid;
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
}

.route-branches .route-hit { border-left: 3px solid var(--moss); }
.route-branches .route-miss { border-left: 3px solid var(--ember); }
.route-hit span { color: var(--moss); }
.route-miss span { color: var(--ember); }

.working-set-visual {
  display: grid;
  grid-template-columns: minmax(210px, 0.8fr) auto minmax(360px, 1.5fr);
  gap: 0.9rem 1rem;
  align-items: center;
  margin-left: auto;
  margin-right: 0;
}

.request-stream {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.request-stream span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid color-mix(in srgb, var(--jade) 50%, var(--line));
  border-radius: 6px;
  background: color-mix(in srgb, var(--jade) 8%, transparent);
  color: var(--text);
  font: 800 0.84rem/1 var(--mono);
}

.buffer-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
}

.buffer-strip > span {
  display: grid;
  gap: 0.25rem;
  min-width: 0;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-soft);
}

.buffer-strip strong {
  color: var(--text);
  font: 500 1.65rem/1 var(--serif);
}

.buffer-strip .hot-page {
  border-color: color-mix(in srgb, var(--moss) 44%, var(--line));
  background: color-mix(in srgb, var(--moss) 7%, var(--bg-soft));
}

.buffer-strip .hot-page em { color: var(--moss); }
.buffer-strip .cold-page { border-color: color-mix(in srgb, var(--ember) 55%, var(--line)); }
.buffer-strip .cold-page em { color: var(--ember); }

:root[data-theme='light'] .buffer-strip .hot-page em { color: var(--moss-dark); }

.eviction-note {
  grid-column: 3;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}

.eviction-note strong { text-align: right; }

@media (max-width: 720px) {

  .request-paths {
    grid-template-columns: 1fr;
  }

  .page-currency-layout {
    grid-template-columns: 1fr;
  }

  .request-paths section,
  .request-paths section + section {
    padding: 1.6rem;
  }

  .request-paths section + section {
    border-left: 1px solid var(--line);
  }

  .request-route,
  .working-set-visual {
    grid-template-columns: 1fr;
    margin-inline: 0;
    padding: 1.1rem;
  }

  .route-arrow,
  .working-arrow {
    justify-self: center;
    transform: rotate(90deg);
  }

  .route-branches {
    grid-template-rows: none;
  }

  .buffer-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .eviction-note {
    grid-column: 1;
    display: grid;
  }

  .eviction-note strong { text-align: left; }
}


/* --- point-wise read paths (chapter 02) ----------------------- */

.read-paths {
  max-width: 820px;
  margin: 1.8rem 0 2rem;
  padding: 0;
  list-style: none;
}