/* Explainer pages: hero, five-question nav, scenes, stage, controls, claims. */

/* ---------- hero ---------- */
.ex-hero { padding: 72px 0 40px; position: relative; overflow: hidden; }
.ex-hero h1 { max-width: 15em; margin-top: 18px; }
.ex-hero .lead { font-size: clamp(1.1rem, 1.6vw, 1.3rem); color: var(--ink-2); max-width: 40em; }
.ex-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; margin-top: 22px; font-family: var(--font-head); font-size: 0.9rem; color: var(--ink-2); }
.ex-meta a { font-weight: 650; }
.ex-hero .note {
  display: inline-block; margin-top: 20px; font-family: var(--font-hand); font-size: 1.05rem;
  color: var(--accent-ink); background: var(--accent-soft); padding: 4px 12px; border-radius: 8px;
}

/* ---------- five-question nav ---------- */
.ex-chapters {
  display: flex; gap: 10px; overflow-x: auto; padding: 6px 2px 14px; margin: 30px 0 0;
  list-style: none; scrollbar-width: thin;
}
.ex-chapters li { flex: 0 0 auto; }
.ex-chapters a, .ex-chapters span {
  display: inline-flex; align-items: center; gap: 10px; text-decoration: none;
  padding: 9px 16px 9px 9px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--card); font-family: var(--font-head); font-weight: 650; font-size: 0.95rem; color: var(--ink);
}
.ex-chapters a:hover { border-color: var(--accent); }
.ex-chapters .num {
  width: 30px; height: 30px; border-radius: 50%; display: inline-grid; place-items: center;
  background: var(--ink); color: var(--paper); font-family: var(--font-hand); font-size: 1.05rem;
  line-height: 1; padding-bottom: 8px;  /* LXGW WenKai sits low in its line box */
}
.ex-chapters [aria-disabled="true"] { color: var(--ink-2); background: transparent; border-style: dashed; }
.ex-chapters [aria-disabled="true"] .num { background: var(--paper-2); color: var(--ink-2); }
.ex-chapters small { font-weight: 500; color: var(--ink-2); font-size: 0.78rem; }

/* ---------- chapter + scene ---------- */
.chapter { padding: 64px 0 8px; border-top: 1px solid var(--line-soft); margin-top: 40px; }
.chapter-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 18px; }
.chapter-num { font-family: var(--font-hand); font-size: 2.6rem; line-height: 1; color: var(--accent); }
.chapter-title { font-family: var(--font-head); font-weight: 700; font-size: 1rem; letter-spacing: 0.06em; color: var(--ink-2); }

.scene { margin: 0 0 56px; }
.scene-text { max-width: 720px; }
.scene-text .lead { font-size: 1.15rem; color: var(--ink); }
.scene-text p { color: var(--ink-2); }

/* ---------- stage ---------- */
.stage {
  position: relative; margin: 26px 0 0; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); box-shadow: var(--shadow);
}
.stage-svg { display: block; width: 100%; height: auto; font-family: var(--font-hand); }
.stage-svg text { fill: var(--ink); }
.stage-caption {
  margin: 0; padding: 12px 20px 14px; min-height: 3.6em;
  font-family: var(--font-hand); font-size: 1.12rem; line-height: 1.55; color: var(--ink);
  border-top: 1px dashed var(--line); background: var(--card);
}
.stage-caption::before { content: "✎ "; color: var(--accent); }

.stage-controls {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin-top: 12px; font-family: var(--font-head); font-size: 0.86rem;
}
.stage-controls button {
  height: 36px; min-width: 36px; padding: 0 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  font: inherit; font-weight: 650; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
}
.stage-controls button:hover { border-color: var(--accent); }
.stage-controls .play { background: var(--ink); color: var(--paper); border-color: var(--ink); min-width: 44px; }
.stage-controls input[type="range"] { flex: 1 1 180px; accent-color: var(--accent); min-width: 120px; }
.stage-controls .clock { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-2); min-width: 7.5em; text-align: right; }

/* ---------- toggle ---------- */
.ex-toggle {
  display: flex; align-items: flex-start; gap: 12px; margin-top: 18px; padding: 14px 16px;
  border: 1px dashed var(--accent); border-radius: var(--radius-sm); background: var(--accent-soft);
}
.ex-toggle input { width: 20px; height: 20px; accent-color: var(--accent); margin-top: 4px; flex: 0 0 auto; }
.ex-toggle label { font-family: var(--font-head); font-weight: 700; cursor: pointer; }
.ex-toggle .toggle-note { display: block; font-family: var(--font-body); font-weight: 400; font-size: 0.95rem; color: var(--ink-2); margin-top: 2px; }

/* ---------- claims (source marks) ---------- */
.claims { margin: 26px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; max-width: 900px; }
.claims-title { font-family: var(--font-head); font-size: 0.85rem; font-weight: 700; letter-spacing: 0.06em; color: var(--ink-2); margin: 30px 0 0; }
details.claim { border: 1px solid var(--line-soft); border-radius: var(--radius-sm); background: var(--card); }
details.claim summary {
  cursor: pointer; padding: 10px 14px; display: flex; gap: 10px; align-items: baseline;
  list-style: none; font-size: 1rem; line-height: 1.6;
}
details.claim summary::-webkit-details-marker { display: none; }
details.claim summary::after { content: "＋"; margin-left: auto; color: var(--ink-3); font-family: var(--font-head); }
details.claim[open] summary::after { content: "－"; }
.claim-body { padding: 0 14px 14px 14px; }
.claim-body blockquote {
  margin: 0; padding: 10px 14px; border-left: 3px solid var(--info);
  background: var(--paper-2); border-radius: 0 8px 8px 0;
  font-family: var(--font-mono); font-size: 0.84rem; line-height: 1.65; color: var(--ink); white-space: pre-wrap;
}
.claim-src { margin: 8px 0 0; font-family: var(--font-head); font-size: 0.82rem; color: var(--ink-2); }

.tag {
  flex: 0 0 auto; font-family: var(--font-head); font-size: 0.74rem; font-weight: 750;
  padding: 1px 8px; border-radius: 6px; letter-spacing: 0.04em; position: relative; top: -1px;
}
.tag--orig { background: color-mix(in srgb, var(--info) 16%, transparent); color: var(--info-ink); }
.tag--interp { background: var(--accent-soft); color: var(--accent-ink); }
.tag--illus { border: 1px dashed var(--ink-3); color: var(--ink-2); }
.ex-toggle .tag { background: var(--card); }

/* text version of the animation: rendered open; the engine folds it when the animation runs */
.stage-transcript { margin-top: 12px; border: 1px solid var(--line-soft); border-radius: var(--radius-sm); background: var(--card); }
.stage-transcript summary { cursor: pointer; padding: 10px 14px; font-family: var(--font-head); font-weight: 650; font-size: 0.92rem; color: var(--ink-2); }
.stage-transcript ol { margin: 0; padding: 0 18px 14px 38px; font-size: 0.98rem; line-height: 1.7; color: var(--ink-2); }
.stage-transcript li { margin: 6px 0; }
html:not(.js) .stage, html:not(.js) .stage-controls, html:not(.js) .ex-toggle { display: none; }

.to-original { display: inline-flex; margin-top: 22px; font-family: var(--font-head); font-weight: 650; font-size: 0.95rem; }

/* ---------- illustrations inside a stage (theme switching: .illo-light / .illo-dark in theme.css) ---------- */
/* --illo-screen: the flat screen colour measured in the autoresearch intro drawings
   (light #feb359, dark #fda847), so text drawn on the screen has a known background */
:root { --illo-screen: #feb359; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --illo-screen: #fda847; } }
:root[data-theme="dark"] { --illo-screen: #fda847; }

/* ---------- capture mode (GIF / MP4 export) ---------- */
body.capture { background: var(--card); }
body.capture > *:not(main), body.capture main > *:not(.chapter), body.capture .chapter > *:not(.wrap) { display: none !important; }
body.capture .chapter { padding: 0; margin: 0; border: 0; }
body.capture .chapter-head, body.capture .scene:not(.is-capture), body.capture .scene-text,
body.capture .stage-controls, body.capture .ex-toggle, body.capture .claims, body.capture .claims-title,
body.capture .to-original { display: none !important; }
body.capture .wrap { max-width: none; padding: 0; }
body.capture .scene.is-capture { margin: 0; }
body.capture .stage { width: 1200px; height: auto; margin: 0; border: 0; border-radius: 0; box-shadow: none; }
/* the caption sits under the picture, never on it (scenes draw down to the bottom edge);
   a fixed two-line height keeps every exported frame the same size */
body.capture .stage-caption {
  position: static; height: 92px; min-height: 0; box-sizing: border-box; margin: 0; padding: 0 48px;
  display: flex; align-items: center; justify-content: center; text-align: center; overflow: hidden;
  border-top: 1px dashed var(--line); background: var(--card); font-size: 1.3rem; line-height: 1.45;
}

@media (max-width: 560px) {
  .stage { margin-left: -12px; margin-right: -12px; border-radius: 12px; }
}

@media (max-width: 720px) {
  .ex-hero { padding: 44px 0 24px; }
  .chapter { padding-top: 44px; }
  .stage-caption { font-size: 1.02rem; padding: 10px 14px 12px; }
}

/* ---------- scene controls: slider and button group ---------- */
.ex-slider, .ex-choice {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 14px; padding: 12px 16px;
  border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--card);
  font-family: var(--font-head); font-size: 0.92rem;
}
.ex-slider label, .choice-label { font-weight: 700; }
.ex-slider input[type="range"] { flex: 1 1 200px; accent-color: var(--accent); min-width: 140px; }
.ex-slider output { font-family: var(--font-mono); font-weight: 600; min-width: 3ch; text-align: right; }
.ex-slider .unit { color: var(--ink-2); }
.ex-slider .toggle-note, .ex-choice .toggle-note { flex-basis: 100%; font-family: var(--font-body); color: var(--ink-2); font-size: 0.92rem; }
.ex-choice button {
  height: 34px; padding: 0 14px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--paper-2); color: var(--ink); font: inherit; font-weight: 650; cursor: pointer;
}
.ex-choice button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.scene-broken .stage, .scene-broken .stage-controls { display: none; }

/* ---------- program.md, paragraph by paragraph ---------- */
.annotated { display: grid; gap: 10px; margin-top: 22px; }
/* one heading per program.md section, written the way the file writes it */
.ann-group { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; margin: 26px 0 2px; font-size: 1.05rem; }
.ann-group:first-child { margin-top: 0; }
.ann-md { font-family: var(--font-mono); font-size: 0.84rem; font-weight: 600; color: var(--ink-2); }
.ann-row { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 22px; align-items: start;
  padding: 14px 16px; border: 1px solid var(--line-soft); border-radius: var(--radius-sm); background: var(--card); }
/* the left column reads like the handbook itself: serif English, inline code, one key phrase marked */
.ann-row blockquote { margin: 0; padding-left: 14px; border-left: 3px solid var(--line);
  font-family: var(--font-body); font-size: 0.98rem; line-height: 1.6; color: var(--ink); }
.ann-row blockquote code { font-size: 0.82em; }
.ann-row blockquote mark { background: var(--accent-soft); color: inherit; padding: 0 3px; border-radius: 3px;
  box-shadow: inset 0 -2px 0 var(--accent); }
.ann-note { margin: 0; font-family: var(--font-hand); font-size: 1.08rem; line-height: 1.6; color: var(--ink); }
.ann-note::before { content: "✎ "; color: var(--accent); }
@media (max-width: 720px) { .ann-row { grid-template-columns: 1fr; } }

/* ---------- quiz ---------- */
.quiz { display: grid; gap: 14px; margin-top: 22px; max-width: 820px; }
.quiz-q { margin: 0; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--card); }
.quiz-q legend { font-family: var(--font-head); font-weight: 700; padding: 0 6px; }
.quiz-opt { display: flex; gap: 10px; align-items: baseline; padding: 6px 4px; cursor: pointer; }
.quiz-opt input { accent-color: var(--accent); }
.quiz-opt.is-right span { color: var(--keep-ink); font-weight: 700; }
.quiz-opt.is-wrong span { color: var(--crash-ink); text-decoration: line-through; }
.quiz-explain summary { cursor: pointer; font-family: var(--font-head); font-size: 0.88rem; color: var(--ink-2); margin-top: 6px; }
.quiz-explain p { margin: 8px 0 0; color: var(--ink); }