/* ============================================================
   AI SCHOOL · library pages (contents · catalog · glossary)
   Reuses tokens + components; adds page-specific bits only.
   ============================================================ */

/* ---------- form controls ---------- */
.field { display: flex; gap: var(--s2); flex-wrap: wrap; align-items: center; }
.input, .select {
  font-family: var(--mono); font-size: 0.78rem; color: var(--cream);
  background: var(--well); border: 1px solid var(--line);
  padding: 10px 12px; outline: none; transition: border-color 0.12s;
}
.input::placeholder { color: var(--cream-mute); }
.input:focus, .select:focus { border-color: var(--terra); }
.input { flex: 1; min-width: 200px; }
[hidden] { display: none !important; }
.select { -webkit-appearance: none; appearance: none; cursor: pointer; padding-right: 30px;
  background-image: linear-gradient(45deg, transparent 50%, var(--terra) 50%), linear-gradient(135deg, var(--terra) 50%, transparent 50%);
  background-position: calc(100% - 15px) 14px, calc(100% - 10px) 14px; background-size: 5px 5px; background-repeat: no-repeat; }
.count { font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cream-dim); margin: var(--s4) 0 var(--s3); }

/* ---------- contents (accordion) ---------- */
.toc { border-top: 1px solid var(--line); }
.toc__phase {
  display: grid; grid-template-columns: 46px 1fr 130px 64px 22px; gap: var(--s3);
  align-items: center; width: 100%; text-align: left;
  padding: var(--s4) var(--s2); background: none; border: none; border-bottom: 1px solid var(--line);
  color: inherit;
}
.toc__phase:hover { background: var(--panel); }
.toc__num { font-family: var(--pix); font-size: 1.5rem; color: var(--terra); }
.toc__nm { font-family: var(--pix); font-size: 1.45rem; text-transform: uppercase; color: var(--cream); line-height: 0.95; }
.toc__nm.is-done { color: var(--terra); }
.toc__count { font-size: 0.62rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--cream-dim); text-align: right; }
.toc__chev { font-family: var(--mono); color: var(--cream-dim); transition: transform 0.18s; justify-self: center; }
.toc__phase[aria-expanded="true"] .toc__chev { transform: rotate(90deg); color: var(--terra); }
.toc__lessons { border-bottom: 1px solid var(--line); background: var(--well); padding: var(--s2) var(--s2) var(--s3) 58px; }
.toc__badge { display: inline-block; margin-left: 8px; font-size: 0.5rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--gold); border: 1px solid var(--gold); padding: 2px 5px; vertical-align: 2px; }

/* ---------- roadmap · dependency graph (left → right) ----------
   The DAG of prerequisites. Hover a node to preview its path; CLICK to
   select it (sticky) — lights everything it needs + unlocks, dims the
   rest. Scoped classes (.tree/.tnode) so it never collides with the
   Home archipelago (.land/.pin). */
.tree-bar { display: flex; align-items: center; justify-content: space-between; gap: var(--s4); flex-wrap: wrap; margin: var(--s5) 0 var(--s3); }
.legend { display: flex; gap: var(--s4); flex-wrap: wrap; }
.legend__i { display: inline-flex; align-items: center; gap: 8px; font-size: 0.6rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cream-dim); }
.legend__i::before { content: ""; width: 13px; height: 13px; border: 2px solid var(--terra-deep); background: var(--panel-2); }
.legend__i--done::before { background: var(--terra); border-color: var(--terra); }
.legend__i--active::before { border-color: var(--gold); box-shadow: 0 0 0 2px var(--terra-tint); }
.legend__i--locked::before { border-style: dashed; background: var(--well); }
.tree-bar__right { display: flex; align-items: center; gap: var(--s3); }
.tree-sel { font-family: var(--mono); font-size: 0.66rem; color: var(--terra); letter-spacing: 0.04em; }
.tree-hint { text-align: center; margin-top: var(--s3); font-size: 0.6rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--cream-mute); }

.tree-wrap { overflow-x: auto; padding: var(--s6) var(--s4); border: 1px solid var(--line); background: var(--well); box-shadow: var(--shadow-pix); }
.tree { position: relative; margin: 0 auto; min-width: max-content; }
.tree-edges { position: absolute; top: 0; left: 0; pointer-events: none; z-index: 0; }
.tree-edge { fill: none; stroke: var(--line); stroke-width: 2; transition: stroke 0.15s, opacity 0.15s; }
.tree-edge.is-trav { stroke: var(--terra-deep); }
.tree.is-tracing .tree-edge { opacity: 0.1; }
.tree.is-tracing .tree-edge.is-lit { opacity: 1; stroke: var(--terra); }

.tnode { position: absolute; z-index: 1; width: 96px; display: flex; flex-direction: column; align-items: center; gap: var(--s2); text-align: center; background: none; border: none; color: inherit; transition: opacity 0.15s; }
.tree.is-tracing .tnode { opacity: 0.22; }
.tree.is-tracing .tnode.is-lit { opacity: 1; }
.tnode__tile { position: relative; width: 72px; height: 72px; display: grid; place-content: center; font-family: var(--pix); font-size: 1.65rem; color: var(--cream); background: var(--panel-2); border: 2px solid var(--terra-deep); box-shadow: var(--shadow-pix); transition: transform 0.1s, box-shadow 0.1s; }
.tnode:hover .tnode__tile { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 rgba(0,0,0,0.45); }
.tnode__nm { font-size: 0.48rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--cream-dim); max-width: 96px; line-height: 1.2; }
.tnode.is-done .tnode__tile { background: var(--terra); border-color: var(--terra); color: var(--bg); }
.tnode.is-done .tnode__nm { color: var(--cream); }
.tnode.is-active .tnode__tile { border-color: var(--gold); box-shadow: 0 0 0 3px var(--terra-tint), var(--shadow-pix); }
.tnode.is-active .tnode__nm { color: var(--cream); }
.tnode.is-locked .tnode__tile { border-style: dashed; color: var(--cream-mute); background: var(--well); }
.tnode--sel .tnode__tile { outline: 3px solid var(--gold); outline-offset: 3px; }
.tnode--boss .tnode__tile { border-color: var(--gold); }
.tnode--boss .tnode__tile::before { content: "\2620"; position: absolute; top: 1px; left: 4px; font-size: 0.72rem; color: var(--gold); }

/* ---------- catalog · search + filters ---------- */

.cat-search { display: flex; align-items: center; gap: var(--s3); background: var(--bg); border: 2px solid var(--line); padding: 0 var(--s4); transition: border-color 0.12s; }
.cat-search:focus-within { border-color: var(--terra); }
.cat-search__cue { font-family: var(--pix); font-size: 1.6rem; color: var(--terra); }
.cat-search__in { flex: 1; background: none; border: none; outline: none; color: var(--cream); font-family: var(--pix); font-size: 2rem; padding: 10px 0; letter-spacing: 0.01em; }
.cat-search__in::placeholder { color: var(--cream-mute); }

.cat-filters { display: flex; gap: var(--s4); flex-wrap: wrap; align-items: center; margin-top: var(--s4); }
.chipset { display: inline-flex; border: 1px solid var(--line); }
.chip { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--cream-dim); background: var(--well); border: none; border-right: 1px solid var(--line); padding: 8px 12px; cursor: pointer; transition: background 0.1s, color 0.1s; }
.chip:last-child { border-right: none; }
.chip:hover { color: var(--cream); }
.chip.is-on { background: var(--terra); color: var(--bg); }

/* ---------- catalog · manifest table ---------- */
.cat-wrap { border: 1px solid var(--line); overflow-x: auto; background: var(--bg); box-shadow: var(--shadow-pix); }
.cat-table { width: 100%; border-collapse: collapse; min-width: 760px; }
.cat-table th {
  font-family: var(--mono); font-size: 0.6rem; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase;
  text-align: left; color: var(--cream-dim); padding: 13px 16px; border-bottom: 2px solid var(--terra-deep);
  cursor: pointer; user-select: none; white-space: nowrap; background: var(--panel-2);
}
.cat-table th:hover { color: var(--terra); }
.cat-table th .arr { color: var(--terra); }
.cat-table td { padding: 9px 16px; border-bottom: 1px solid var(--line-soft); vertical-align: middle; }
.cat-table tr:hover td { background: var(--panel); }
.cat-table tr.is-link { cursor: pointer; }
.cat-table tr.is-link:hover .cat-name { color: var(--terra); }

/* phase = mini world-map tile */
.cat-phase {
  display: inline-grid; place-content: center; width: 34px; height: 34px;
  font-family: var(--pix); font-size: 1.25rem; color: var(--terra);
  background: var(--panel-2); border: 1px solid var(--terra-deep);
}

/* lesson name = pixel display font, echoing the TOC + glossary */
.cat-name {
  font-family: var(--pix); font-size: 1.5rem; line-height: 0.92; letter-spacing: 0.01em;
  color: var(--cream); display: inline-block; border-bottom: 2px solid transparent;
}
a.cat-name:hover { color: var(--terra); border-bottom-color: var(--terra); }

.cat-tag { font-family: var(--mono); font-size: 0.56rem; letter-spacing: 0.1em; text-transform: uppercase; padding: 3px 8px; border: 1px solid var(--line); color: var(--cream-dim); white-space: nowrap; }
.cat-tag[data-t="Build"] { color: var(--terra); border-color: var(--terra-deep); }
.cat-tag[data-t="Capstone"] { color: var(--gold); border-color: var(--gold); }
.cat-lang { font-family: var(--mono); font-size: 0.68rem; color: var(--cream-dim); }
.cat-stat { display: inline-flex; align-items: center; gap: 6px; font-size: 0.64rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--cream-dim); }
.cat-stat::before { content: ""; width: 8px; height: 8px; border: 1px solid var(--cream-mute); }
.cat-stat[data-s="cleared"] { color: var(--terra); }
.cat-stat[data-s="cleared"]::before { background: var(--terra); border-color: var(--terra); }
.cat-stat[data-s="open"]::before { border-color: var(--terra-deep); }
.cat-stat[data-s="planned"] { color: var(--cream-mute); }
.cat-stat[data-s="planned"]::before { border-style: dashed; }
.cat-empty { text-align: center; padding: var(--s7); color: var(--cream-dim); font-size: 0.8rem; }

/* ---------- glossary (flip-to-reveal cards) ---------- */
.gloss-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s4); }
.gloss-card {
  border: 1px solid var(--line); background: var(--panel); padding: var(--s4) var(--s4) var(--s5);
  text-align: left; color: inherit; cursor: pointer; position: relative;
  transition: border-color 0.12s, transform 0.1s;
}
.gloss-card:hover { border-color: var(--terra-deep); transform: translateY(-2px); }
.gloss-term { font-family: var(--pix); font-size: 1.7rem; color: var(--terra); text-transform: uppercase; line-height: 0.9; margin-bottom: var(--s3); }
.gloss-lbl { font-size: 0.56rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--cream-mute); margin-bottom: 4px; }
.gloss-say { font-style: italic; color: var(--cream-dim); font-size: 0.82rem; line-height: 1.45; }
.gloss-mean { display: none; color: var(--cream); font-size: 0.82rem; line-height: 1.5; }
.gloss-card.is-flipped .gloss-face-say { display: none; }
.gloss-card.is-flipped .gloss-mean { display: block; }
.gloss-hint { position: absolute; top: var(--s4); right: var(--s4); font-size: 0.54rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cream-mute); }
.gloss-card.is-flipped .gloss-hint { color: var(--terra); }

@media (max-width: 720px) {
  .gloss-grid { grid-template-columns: 1fr; }
  .toc__phase { grid-template-columns: 38px 1fr 50px 22px; }
  .toc__count.mini { display: none; }
  .toc__lessons { padding-left: var(--s4); }
}

/* ---------- library (curated reading list) ---------- */
.chipset--wrap { display: flex; flex-wrap: wrap; border: none; gap: var(--s2); }
.chipset--wrap .chip { border: 1px solid var(--line); }
.chipset--wrap .chip:hover { border-color: var(--terra-deep); }
.chipset--wrap .chip.is-on { border-color: var(--terra); }

.lib-tier { margin-top: var(--s7); }
.lib-tier.is-hidden { display: none; }
.lib-tier__hd { display: flex; align-items: center; gap: var(--s4); padding-bottom: var(--s3); border-bottom: 1px solid var(--terra-deep); }
.lib-tier__label { font-family: var(--pix); font-size: 1.6rem; text-transform: uppercase; color: var(--terra); line-height: 1; }
.lib-tier__count { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.06em; color: var(--cream-mute); }
.lib-tier__desc { font-size: 0.78rem; color: var(--cream-dim); margin: var(--s3) 0 var(--s4); line-height: 1.5; }

.book-list { display: flex; flex-direction: column; }
.book {
  display: grid; grid-template-columns: 1fr auto; align-items: start; gap: var(--s4);
  padding: var(--s3) var(--s2); border-bottom: 1px solid var(--line-soft); transition: background 0.12s;
  cursor: pointer; text-decoration: none; color: inherit;
}
.book:hover { background: var(--panel); }
.book:hover .book__title { color: var(--terra); }
.book.is-hidden { display: none; }
.book__title { font-size: 0.92rem; font-weight: 500; color: var(--cream); line-height: 1.3; transition: color 0.12s; }
.book__author { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.04em; color: var(--cream-mute); margin-top: 3px; }
.book__note { font-size: 0.76rem; color: var(--cream-dim); line-height: 1.45; margin-top: 5px; max-width: 64ch; }
.book__meta { display: flex; flex-direction: column; align-items: flex-end; gap: 5px; flex-shrink: 0; }
.book__topic { font-family: var(--mono); font-size: 0.54rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--terra); border: 1px solid var(--terra-deep); padding: 2px 7px; white-space: nowrap; }
.book__format { font-family: var(--mono); font-size: 0.56rem; letter-spacing: 0.04em; color: var(--cream-mute); white-space: nowrap; }
.book__type { font-family: var(--mono); font-size: 0.52rem; letter-spacing: 0.08em; text-transform: uppercase; padding: 2px 6px; white-space: nowrap; border: 1px solid; }
.book__type[data-type="Book"]        { color: var(--cream-dim); border-color: var(--line); }
.book__type[data-type="Video"]       { color: #e06c75; border-color: #7a3a3f; }
.book__type[data-type="Course"]      { color: #61afef; border-color: #2d5470; }
.book__type[data-type="Paper"]       { color: #c678dd; border-color: #5c3a6b; }
.book__type[data-type="Article"]     { color: #98c379; border-color: #3d5c30; }
.book__type[data-type="Interactive"] { color: var(--gold); border-color: #5c4a1a; }

.lib-source { margin-top: var(--s7); padding-top: var(--s4); border-top: 1px solid var(--line); font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.04em; color: var(--cream-mute); }

@media (max-width: 640px) {
  .book { grid-template-columns: 1fr; gap: var(--s2); }
  .book__meta { flex-direction: row; align-items: center; }
}