/* luce.luciaos.com — the documentation frame only. The shared palette,
 * typography, prose, code, tables, cards, and common controls live in
 * www/shared/core.css and are loaded before this file. */

:root {
  --prose: 46rem;
  --side: 16rem;
  --rail: 13rem;
}

/* Header frame and search */

header.top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  column-gap: 1.5rem;
  height: var(--bar);
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  background: var(--paper);
  border-bottom: 1px solid var(--line-strong);
}

.mark { justify-self: start; }

nav.tabs {
  display: flex;
  justify-self: center;
  gap: 1.35rem;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
}

.tools { justify-self: end; }

.find input {
  width: 9rem;
  max-width: 30vw;
  padding: .36rem .55rem;
  color: var(--ink);
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 0;
  font: inherit;
  font-size: .82rem;
}

.find input::placeholder { color: var(--ink-faint); }

#hits {
  position: absolute;
  top: var(--bar);
  right: 1.25rem;
  width: min(30rem, calc(100vw - 2.5rem));
  max-height: 70vh;
  overflow-y: auto;
  background: var(--paper-raised);
  border: 1px solid var(--line-strong);
}

#hits a {
  display: block;
  padding: .6rem .8rem;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

#hits a:last-child { border-bottom: 0; }
#hits a:hover, #hits a.on { color: var(--ink); background: var(--accent-soft); }
#hits b { display: block; font-weight: 800; }
#hits em { display: block; color: var(--ink-faint); font-size: .82rem; font-style: normal; }
#hits .none { padding: .8rem; color: var(--ink-faint); font-size: .86rem; }

/* Documentation shell */

.shell {
  display: grid;
  grid-template-columns: var(--side) minmax(0, 1fr) var(--rail);
  align-items: start;
  gap: 2.6rem;
  max-width: 86rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.side {
  position: sticky;
  top: var(--bar);
  max-height: calc(100vh - var(--bar));
  padding: 2.4rem 0;
  overflow-y: auto;
}

.side details { border: 0; }

.side summary,
.rail h2 {
  color: var(--ink-faint);
  font-size: .69rem;
  font-weight: 800;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.side summary {
  margin-bottom: .75rem;
  padding-left: .65rem;
  cursor: default;
  list-style: none;
}

.side summary::before {
  content: "■";
  margin-right: .55rem;
  color: var(--accent);
  font-size: .6em;
}

.side summary::-webkit-details-marker { display: none; }
.side ul { margin: 0; padding: 0; list-style: none; }
.side li, .rail li { margin: 0; }

.side li a {
  display: block;
  padding: .28rem .55rem .28rem .65rem;
  color: var(--ink-soft);
  border-left: 2px solid transparent;
  font-size: .87rem;
  font-weight: 500;
  line-height: 1.45;
  text-decoration: none;
}

.side li a:hover { color: var(--ink); background: var(--paper-soft); }

.side li.part {
  margin: 1.15rem .65rem .3rem;
  color: var(--ink-faint);
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.side li.part:first-of-type { margin-top: .85rem; }
.side li.h3 a { padding-left: 1.45rem; font-size: .83rem; }

.side li a.here {
  color: var(--ink);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 800;
}

main { min-width: 0; padding: 2.5rem 0 4.5rem; }
article { max-width: var(--prose); }
article > ul, article > ol { margin: 0 0 1.15rem; padding-left: 1.45rem; }

.rail {
  position: sticky;
  top: var(--bar);
  max-height: calc(100vh - var(--bar));
  padding: 2.85rem 0;
  overflow-y: auto;
}

.rail h2 {
  margin: 0 0 .75rem;
  padding: 0;
  border: 0;
  line-height: 1.4;
}

.rail ul {
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
  list-style: none;
}

.rail li a {
  display: block;
  margin-left: -1px;
  padding: .2rem .7rem;
  color: var(--ink-faint);
  border-left: 2px solid transparent;
  font-size: .8rem;
  font-weight: 500;
  line-height: 1.45;
  text-decoration: none;
}

.rail li.h3 a { padding-left: 1.35rem; font-size: .77rem; }
.rail li a:hover { color: var(--ink); }
.rail li a.on { color: var(--ink); border-left-color: var(--accent); font-weight: 800; }

/* Front page and footer */

.hero { max-width: 46rem; margin: 1.5rem 0 3rem; }
.hero p.lead { margin-bottom: 1.7rem; color: var(--ink-soft); font-size: 1.15rem; line-height: 1.7; }
.doors { grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }

footer {
  max-width: 86rem;
  margin: 0 auto;
  padding: 2.2rem 1.5rem 3rem;
  color: var(--ink-faint);
  border-top: 1px solid var(--line-strong);
  font-size: .79rem;
}

footer p { margin: 0; }

/* Responsive frame */

@media (max-width: 70rem) {
  .shell { grid-template-columns: var(--side) minmax(0, 1fr); gap: 2.2rem; }
  .rail { display: none; }
}

@media (max-width: 66rem) {
  header.top {
    position: static;
    display: flex;
    flex-wrap: wrap;
    height: auto;
    row-gap: .2rem;
    padding: .65rem 1.25rem;
  }

  nav.tabs { order: 3; width: 100%; justify-content: flex-start; }
  .tools { margin-left: auto; }
  .side, .rail { top: 0; }
  #hits { position: fixed; top: auto; right: 1rem; left: 1rem; width: auto; }
}

@media (max-width: 52rem) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 0; padding: 0 1rem; }

  .side {
    position: static;
    max-height: none;
    padding: 1.25rem 0 0;
    overflow: visible;
  }

  .side details {
    padding: .55rem .7rem;
    background: var(--paper-soft);
    border: 1px solid var(--line-strong);
  }

  .side summary { margin: 0; cursor: pointer; }
  .side details[open] summary { margin-bottom: .55rem; }
  .side ul { padding-top: .25rem; }
  main { padding: 1.7rem 0 3.2rem; }
  h1 { font-size: 2.15rem; }
  h2 { margin-top: 2.7rem; }
  header.top { padding: .55rem 1rem; }
  .find input { width: 6.5rem; max-width: none; }
  nav.seq { flex-direction: column; }
  nav.seq a { max-width: none; }
  nav.seq a.on { margin-left: 0; text-align: left; }
}

@media (max-width: 32rem) {
  body { font-size: .94rem; }
  .tools { gap: .55rem; }
  a.cross { display: none; }
  nav.tabs { gap: 1rem; }
  .find input { width: 7.5rem; }
}

@media print {
  header.top, .side, .rail, nav.seq, footer, button.copy { display: none; }
  .shell { display: block; }
  article { max-width: none; }
}

/* luce-base.luciaos.com additions: the landing lede and the chapter pager. */

.lede { margin-top: -.5rem; color: var(--ink-faint); font-size: 1.05rem; }

nav.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--prose);
  margin: 3rem 0 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: .92rem;
}
nav.pager a { text-decoration: none; }
nav.pager a:hover { text-decoration: underline; }