/* =====================================================================
   nousspace Learn (/learn/): a finite stream of self-contained entries.
   Built on blog.css (tokens, themes, header, toast); this file adds only
   Learn's own pieces. Page: tools/learn.py. Behaviour: assets/learn.js.
   ===================================================================== */

.is-learn main { --learn-w: min(62rem, 100% - 2 * var(--gutter)); --col: 38rem; --side: 15rem; }

/* ---- head ---- */
.learn-head { width: var(--learn-w); margin: 0 auto; padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(1.5rem, 3vw, 2.25rem); }
.learn-title { max-width: 15ch; margin: .8rem 0 .9rem; font: 380 clamp(38px, 5.4vw, 68px)/1.02 var(--serif); font-variation-settings: "opsz" 72; letter-spacing: -.035em; text-wrap: balance; }
.learn-dek { max-width: 34rem; margin: 0; color: var(--ink-2); font: 400 clamp(17px, 1.3vw, 19px)/1.55 var(--serif); }

/* ---- sticky progress bar: entry dots, read count, saved ---- */
.learn-track { position: fixed; inset: 0 0 auto; z-index: 31; height: 2px; pointer-events: none; }
.learn-track span { display: block; height: 100%; width: 100%; background: var(--accent); transform-origin: 0 50%; transform: scaleX(0); }
.learn-bar {
  position: sticky; top: 58px; z-index: 20;
  display: flex; align-items: center; gap: .75rem 1.25rem; flex-wrap: wrap;
  width: var(--learn-w); margin: 0 auto; padding: .55rem 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  border-block: 1px solid var(--line);
}
.learn-dots ol { display: flex; gap: 2px; margin: 0; padding: 0; list-style: none; }
.learn-dots a { display: grid; place-items: center; width: 24px; height: 32px; border-radius: 8px; }
.learn-dots a::before { content: ""; width: 8px; height: 8px; border-radius: 50%; border: 1.5px solid var(--muted); transition: background .2s, border-color .2s, transform .2s var(--ease); }
.learn-dots a.is-read::before { background: var(--accent); border-color: var(--accent); }
.learn-dots a[aria-current="true"]::before { transform: scale(1.45); border-color: var(--ink); }
.learn-dots a:hover::before { border-color: var(--ink); }
.learn-count { margin: 0; color: var(--ink-2); font: 400 13px/1.3 var(--sans); font-variant-numeric: tabular-nums; }
.learn-count strong { color: var(--ink); font-weight: 600; }
.act-saved { margin-left: auto; }
.saved-n { min-width: 1.5em; padding: 0 .4em; border-radius: 999px; background: var(--chip); font: 600 12px/1.6 var(--sans); text-align: center; font-variant-numeric: tabular-nums; }

/* ---- buttons (pill actions) ---- */
.act {
  display: inline-flex; align-items: center; gap: .45rem; min-height: 40px; padding: 0 .95rem;
  border: 1px solid var(--line); border-radius: 999px; background: transparent; color: var(--ink);
  font: 500 13.5px/1 var(--sans); text-decoration: none; cursor: pointer;
  transition: background .2s, border-color .2s, color .2s;
}
.act:hover { background: var(--chip); border-color: color-mix(in srgb, var(--ink) 28%, transparent); }
.act svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.act-save[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.act-save[aria-pressed="true"] svg { fill: currentColor; }
.act-essay { border-color: transparent; background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.act-essay:hover { background: color-mix(in srgb, var(--accent) 18%, transparent); border-color: transparent; }
.act-quiet { border-color: transparent; color: var(--muted); }
.act-icon { width: 40px; padding: 0; justify-content: center; }
.mini-label { margin: 0 0 .55rem; color: var(--muted); font: 400 10.5px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.badge { padding: .15em .55em; border-radius: 999px; background: var(--chip); color: var(--muted); font: 500 10.5px/1.5 var(--sans); letter-spacing: .02em; text-transform: none; }

/* ---- entries ---- */
.learn-list { width: var(--learn-w); margin: 0 auto; padding: 0; list-style: none; counter-reset: none; }
.entry-item + .entry-item { border-top: 1px solid var(--line); }
.entry {
  display: grid; grid-template-columns: minmax(0, var(--col)) var(--side); column-gap: clamp(2rem, 5vw, 4rem);
  grid-template-areas: "label ." "title ." "insight sources" "support sources" "depth sources" "actions sources";
  grid-template-rows: auto auto auto auto auto 1fr;
  padding: clamp(2.75rem, 7vw, 4.5rem) 0; scroll-margin-top: 112px; outline: none;
  border-radius: var(--r-block); transition: background-color .9s ease, box-shadow .9s ease;
}
/* Arriving from a deep link or the essay: a brief wash that extends past the text edges. */
.entry.is-arrived { background: var(--accent-soft); box-shadow: 0 0 0 clamp(12px, 2vw, 22px) var(--accent-soft); transition: none; }
.entry:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
.entry-label { grid-area: label; display: flex; flex-wrap: wrap; align-items: center; gap: .5em; margin: 0 0 1rem; color: var(--muted); font: 400 11px/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.entry-label a { color: var(--accent); text-decoration: none; }
.entry-label a:hover { text-decoration: underline; text-underline-offset: 3px; }
.entry-num { color: var(--ink); }
.entry-title { grid-area: title; margin: 0 0 1.1rem; font: 420 clamp(27px, 3.3vw, 38px)/1.12 var(--serif); font-variation-settings: "opsz" 48; letter-spacing: -.02em; text-wrap: balance; }
.entry-insight { grid-area: insight; margin: 0 0 1.5rem; font: 400 var(--fs)/1.62 var(--serif); font-variation-settings: "opsz" 18; color: var(--ink); text-wrap: pretty; }
[data-face="sans"] .entry-insight, [data-face="sans"] .depth-body { font-family: var(--sans); font-size: calc(var(--fs) * .92); }
.entry-support { grid-area: support; }
.entry-support:empty { display: none; }

/* citations beside the claims */
.cite { line-height: 0; font: 600 .62em var(--sans); }
.cite a { display: inline-block; min-width: 1.5em; padding: .15em .25em; margin-left: .1em; border-radius: 6px; background: var(--accent-soft); color: var(--accent); text-align: center; text-decoration: none; }
.cite a:hover { background: var(--accent); color: var(--bg); }
.entry-sources { grid-area: sources; align-self: start; position: sticky; top: 124px; padding-top: .35rem; border-top: 1px solid var(--line); }
.entry-sources ol { margin: 0; padding: 0; list-style: none; counter-reset: src; }
.entry-sources li { counter-increment: src; position: relative; display: grid; gap: .2rem; padding: .7rem .6rem .7rem 2rem; margin: 0 -.6rem; border-radius: var(--r-small); font: 400 13px/1.45 var(--sans); color: var(--ink-2); transition: background .6s ease; }
.entry-sources li::before { content: counter(src); position: absolute; left: .6rem; top: .72rem; color: var(--accent); font: 600 11.5px/1.45 var(--sans); }
.entry-sources li.is-flash { background: var(--accent-soft); transition: none; }
.src-label { color: var(--ink); }
.src-note { color: var(--muted); }
.src-link { justify-self: start; color: var(--accent); font-size: 12.5px; text-underline-offset: 3px; overflow-wrap: anywhere; }

/* supporting content */
.entry-figure { margin: 0 0 1.5rem; padding: clamp(1rem, 3vw, 1.5rem); border-radius: var(--r-block); background: var(--bg-2); color: var(--ink); }
.entry-figure svg { display: block; width: 100%; height: auto; }
.entry-figure img { width: 100%; border-radius: var(--r-small); }
.entry-figure figcaption { margin-top: .8rem; color: var(--ink-2); font: 400 13.5px/1.5 var(--sans); }
.fig-text { margin-top: .6rem; font: 400 13.5px/1.55 var(--sans); color: var(--ink-2); }
.fig-text summary { width: fit-content; min-height: 32px; display: flex; align-items: center; color: var(--accent); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.fig-text p { margin: .4rem 0 0; }
.entry-quote { margin: 0 0 1.5rem; padding: .2rem 0 .2rem 1.25rem; border-left: 3px solid var(--accent); }
.entry-quote p { margin: 0 0 .6rem; font: italic 400 clamp(22px, 2.4vw, 27px)/1.35 var(--serif); letter-spacing: -.01em; }
.entry-quote footer { color: var(--muted); font: 400 13.5px/1.4 var(--sans); }
.entry-example { margin: 0 0 1.5rem; padding: 1rem 1.2rem; border: 1px dashed color-mix(in srgb, var(--accent) 45%, transparent); border-radius: var(--r-block); }
.entry-example p { margin: 0; font: 400 15.5px/1.55 var(--sans); color: var(--ink-2); }

/* progressive depth: expands in place */
.entry-depth { grid-area: depth; margin: 0 0 1.5rem; border-block: 1px solid var(--line); }
.entry-depth summary { display: flex; align-items: center; gap: .7rem; min-height: 52px; list-style: none; cursor: pointer; font: 600 14.5px/1.2 var(--sans); }
.entry-depth summary::-webkit-details-marker { display: none; }
.depth-time { color: var(--muted); font-weight: 400; }
.depth-chev { width: 20px; height: 20px; margin-left: auto; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; transition: transform .3s var(--ease); }
.entry-depth[open] .depth-chev { transform: rotate(180deg); }
.entry-depth summary:hover .depth-label { text-decoration: underline; text-underline-offset: 4px; }
.depth-body { padding: .25rem 0 1.2rem; font: 400 calc(var(--fs) * .92)/1.68 var(--serif); color: var(--ink-2); }
.depth-body > :first-child { margin-top: 0; }
.depth-body p, .depth-body ul, .depth-body ol { margin: 0 0 1em; }
.depth-body ul, .depth-body ol { padding-left: 1.2em; }
.depth-body li { margin: .3em 0; }
.depth-body li::marker { color: var(--accent); }
.depth-body strong { color: var(--ink); }
.depth-body code { padding: .1em .35em; border-radius: 6px; background: var(--chip); font: 400 .82em var(--mono); }
@supports (interpolate-size: allow-keywords) {
  .entry-depth { interpolate-size: allow-keywords; }
  .entry-depth::details-content { height: 0; overflow: clip; transition: height .4s var(--ease), content-visibility .4s allow-discrete; }
  .entry-depth[open]::details-content { height: auto; }
}

.entry-actions { grid-area: actions; display: flex; flex-wrap: wrap; gap: .55rem; align-self: start; }
.entry-actions .act-essay { margin-left: auto; }

/* ---- end state ---- */
.learn-end { width: var(--learn-w); margin: 0 auto; padding: clamp(3rem, 8vw, 5.5rem) 0 clamp(3rem, 7vw, 5rem); border-top: 1px solid var(--line); text-align: center; outline: none; scroll-margin-top: 112px; }
.learn-end-title { margin: .8rem auto .7rem; font: 400 clamp(30px, 4vw, 46px)/1.05 var(--serif); letter-spacing: -.03em; }
.learn-end-sum { max-width: 32rem; margin: 0 auto 2.25rem; color: var(--ink-2); font: 400 17.5px/1.55 var(--serif); }
.end-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 1rem; text-align: left; }
.end-card { display: flex; flex-direction: column; align-items: flex-start; gap: .7rem; padding: 1.25rem 1.3rem 1.35rem; border-radius: var(--r-block); background: var(--bg-2); }
.end-card p { margin: 0; color: var(--ink-2); font: 400 15px/1.5 var(--sans); }
.end-card .mini-label { margin: 0; }
.end-card a { color: var(--ink); font-weight: 600; text-underline-offset: 3px; }
.end-note { color: var(--muted) !important; font-size: 13px !important; }
.end-topics { display: flex; flex-wrap: wrap; gap: .45rem; margin: 0; padding: 0; list-style: none; }
.end-topics a { display: inline-flex; align-items: center; min-height: 36px; padding: 0 .9rem; border: 1px solid var(--line); border-radius: 999px; font: 500 13.5px var(--sans); text-decoration: none; }
.end-topics a:hover { background: var(--chip); }
.end-restart { margin: 2rem 0 0; font: 400 14px var(--sans); }
.end-restart a { color: var(--ink-2); text-underline-offset: 3px; }

/* ---- empty state ---- */
.learn-empty { width: var(--learn-w); margin: 0 auto 5rem; padding: 2rem; border-radius: var(--r-block); background: var(--bg-2); }
.learn-empty h2 { margin: 0 0 .6rem; font: 400 28px/1.15 var(--serif); }
.learn-empty p { max-width: 34rem; color: var(--ink-2); font: 400 16px/1.55 var(--sans); }

/* ---- saved dialog ---- */
.saved-dialog { width: min(36rem, 100% - 2rem); max-height: min(44rem, 100% - 3rem); padding: 1.4rem 1.5rem 1.5rem; border: 1px solid var(--line); border-radius: var(--r-block); background: var(--bg); color: var(--ink); }
.saved-dialog::backdrop { background: rgba(10, 10, 9, .42); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.saved-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.saved-head h2 { margin: 0; font: 420 26px/1.15 var(--serif); letter-spacing: -.02em; }
.saved-note { margin: .4rem 0 1.1rem; color: var(--muted); font: 400 13.5px/1.5 var(--sans); }
.saved-list { display: grid; gap: .5rem; margin: 0 0 1.2rem; padding: 0; list-style: none; }
.saved-list li { display: flex; align-items: flex-start; gap: .6rem; padding: .85rem 1rem; border-radius: var(--r-small); background: var(--bg-2); }
.saved-list a { flex: 1; color: var(--ink); font: 500 15px/1.4 var(--serif); text-decoration: none; }
.saved-list a:hover { text-decoration: underline; text-underline-offset: 3px; }
.saved-list .saved-topic { display: block; margin-bottom: .2rem; color: var(--muted); font: 400 10.5px/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.saved-list button { flex: none; min-height: 32px; padding: 0 .7rem; border: 0; border-radius: 999px; background: transparent; color: var(--muted); font: 500 12.5px var(--sans); cursor: pointer; }
.saved-list button:hover { background: var(--chip); color: var(--ink); }
.saved-empty { margin: 0 0 1.2rem; color: var(--ink-2); font: 400 15px/1.5 var(--sans); }
.saved-file { padding-top: 1.1rem; border-top: 1px dashed var(--line); }
.saved-file p { margin: 0 0 .8rem; color: var(--ink-2); font: 400 13.5px/1.5 var(--sans); }
.saved-file-actions { display: flex; flex-wrap: wrap; gap: .5rem; }

/* ---- small screens: one column, sources right after the claim they support ---- */
@media (max-width: 860px) {
  .entry { grid-template-columns: minmax(0, 1fr); grid-template-areas: "label" "title" "insight" "sources" "support" "depth" "actions"; grid-template-rows: none; }
  .entry-sources { position: static; margin: -.4rem 0 1.5rem; padding: .2rem 0 0; }
  .entry-sources li { padding-block: .5rem; }
  .entry-actions .act-essay { margin-left: 0; }
}
@media (max-width: 520px) {
  .learn-bar { gap: .4rem .6rem; flex-wrap: nowrap; }
  .learn-dots ol { gap: 0; }
  .learn-dots a { width: 17px; }
  .learn-count { font-size: 12px; white-space: nowrap; }
  .act { padding: 0 .8rem; }
  .act-saved { padding: 0 .7rem; }
  .act-saved .saved-word { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
}

/* Learn honours reduced motion for its own movement (scrolling, expanding, highlights). */
@media (prefers-reduced-motion: reduce) {
  .entry, .entry-sources li, .depth-chev, .learn-dots a::before { transition: none !important; }
  .entry-depth::details-content { transition: none !important; }
}