/* Interactive guides (2026-09-24): the chart viewer, its explanation dialog,
   the eight standalone pages, the collection, and the homepage's full-chart
   dialog. Adapted from the reviewed Phase 1 viewer.css; every rule is scoped
   to an .ig-* class so nothing here restyles the site shell. Colours are the
   reviewed palette, flipped for dark mode by BOTH site mechanisms
   (:root[data-theme] and the prefers-color-scheme mirror). The chart artwork
   itself stays on white paper in both themes. */
.ig-scope { --ig-navy: #0c2948; --ig-gold: #edbb43; --ig-ink: #18334b; --ig-muted: #526779; --ig-teal: #206879; --ig-surface: #fffdf9; --ig-subtle: #eef3f5; --ig-line: #b6c3cd; --ig-note: #fbf2da; --ig-link: #153f62; --ig-card-line: #b08c47; color: var(--ig-ink); }
:root[data-theme="dark"] .ig-scope { --ig-ink: #e6edf4; --ig-muted: #b5c5d3; --ig-teal: #88cbd1; --ig-surface: #172a3d; --ig-subtle: #21384c; --ig-line: #577187; --ig-note: #3f3725; --ig-link: #b8defa; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .ig-scope { --ig-ink: #e6edf4; --ig-muted: #b5c5d3; --ig-teal: #88cbd1; --ig-surface: #172a3d; --ig-subtle: #21384c; --ig-line: #577187; --ig-note: #3f3725; --ig-link: #b8defa; }
}
html.ig-locked, html.ig-locked body { overflow: hidden; }
/* The site reset zeroes every margin, and a modal dialog is centred by its
   auto margins: without this both dialogs open pinned to the top left. */
.ig-dialog, .ig-map-dialog { margin: auto; }
.ig-scope button, .ig-scope select { font: 600 14px var(--font-sans); -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
.ig-scope button { cursor: pointer; }
.ig-scope a { color: var(--ig-link); }
.ig-scope button:focus-visible, .ig-scope a:focus-visible, .ig-scope select:focus-visible, .ig-viewport:focus-visible { outline: 3px solid #239dc9; outline-offset: 3px; }
.ig-eyebrow { font: 600 11px/1.5 var(--font-sans); letter-spacing: .1em; color: var(--ig-teal); text-transform: uppercase; margin: 0; }

/* Standalone page head */
.ig-page { max-width: 1200px; margin: 0 auto; padding: 18px 20px 8px; }
.ig-back { display: inline-flex; align-items: center; min-height: 44px; font: 600 14px/1.4 var(--font-sans); text-decoration: none; }
.ig-back:hover { text-decoration: underline; }
.ig-head { display: flex; gap: 24px; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; margin: 4px 0 20px; }
.ig-head > div:first-child { max-width: 760px; }
.ig-scope .ig-head h1 { font: 600 clamp(27px, 2.6vw, 36px)/1.18 var(--font-serif); color: var(--ig-ink); margin: 6px 0 8px; }
.ig-head p { font: 400 17px/1.55 var(--font-serif); color: var(--ig-muted); margin: 0; max-width: 720px; }
.ig-sample-plus { color: #9b6d12; font-weight: 700; }
:root[data-theme="dark"] .ig-sample-plus { color: var(--ig-gold); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .ig-sample-plus { color: var(--ig-gold); } }
.ig-downloads { display: flex; gap: 9px; flex-wrap: wrap; }
.ig-downloads a { display: inline-flex; align-items: center; min-height: 44px; padding: 10px 14px; border: 1px solid var(--ig-card-line); border-radius: 6px; background: var(--ig-surface); font: 600 13px/1.3 var(--font-sans); text-decoration: none; }
.ig-downloads a:hover { background: var(--ig-subtle); }

/* Viewer */
.ig-controls { display: flex; align-items: flex-end; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.ig-step-picker { flex: 1; min-width: 240px; max-width: 620px; }
.ig-step-picker label { display: block; font: 600 12px/1.4 var(--font-sans); margin-bottom: 6px; color: var(--ig-ink); }
.ig-step-picker select { width: 100%; min-height: 44px; padding: 11px 12px; border: 1px solid var(--ig-line); border-radius: 5px; color: var(--ig-ink); background: var(--ig-surface); text-overflow: ellipsis; }
.ig-control { min-height: 44px; padding: 11px 14px; border: 1px solid var(--ig-line); border-radius: 5px; background: var(--ig-surface); color: var(--ig-ink); }
.ig-control:hover { border-color: #b38528; }
.ig-help { flex-basis: 100%; font: 400 12px/1.5 var(--font-sans); color: var(--ig-muted); margin: 0; }
.ig-viewport { overflow: auto; border: 1px solid var(--ig-line); border-radius: 3px; box-shadow: 0 10px 36px #0e29451a; background: #fff; scrollbar-color: #8a9aa8 #edf0f3; }
.ig-chart { position: relative; width: 100%; max-width: var(--art-width); margin: 0 auto; line-height: 0; }
.ig-chart img { display: block; width: 100%; height: auto; }
.ig-chart.ig-enlarged { width: 1400px; max-width: none; }
.ig-hotspot { position: absolute; border: 2px solid transparent; background: transparent; border-radius: 8px; padding: 0; transition: background .12s, border-color .12s; }
.ig-hotspot:hover, .ig-scope .ig-hotspot:focus-visible { border-color: #bd881a; background: #edbb431c; outline: none; box-shadow: 0 0 0 2px #ffffffbb; }
.ig-plus { position: absolute; right: 0; top: 0; display: grid; place-items: center; width: 24px; height: 24px; border: 2px solid #fff; border-radius: 50%; background: #0c2948; color: #edbb43; font: 600 19px/1 var(--font-sans); box-shadow: 0 1px 5px #0004; transform: translate(32%, -28%); pointer-events: none; }
.ig-hotspot:hover .ig-plus, .ig-hotspot:focus-visible .ig-plus { background: #edbb43; color: #0c2948; }
.ig-markers-hidden .ig-plus { visibility: hidden; }
.ig-markers-hidden .ig-hotspot:hover .ig-plus, .ig-markers-hidden .ig-hotspot:focus-visible .ig-plus { visibility: visible; }
.ig-footnote { font: 400 13px/1.55 var(--font-sans); color: var(--ig-muted); max-width: 850px; margin: 18px auto 22px; }
.ig-chart-nav { border-top: 1px solid var(--ig-line); padding-top: 14px; margin-bottom: 28px; display: flex; flex-wrap: wrap; gap: 0 18px; }
.ig-chart-nav h2 { flex-basis: 100%; font: 600 12px/1.5 var(--font-sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ig-teal); margin: 0 0 4px; }
.ig-chart-nav a { display: inline-flex; align-items: center; min-height: 44px; font: 400 14px/1.3 var(--font-sans); }
.ig-chart-nav [aria-current="page"] { font-weight: 600; text-decoration: none; color: var(--ig-ink); }

/* Explanation dialog */
.ig-dialog { border: 1px solid #bf9235; border-top: 5px solid var(--ig-gold); border-radius: 12px; padding: 0; width: 660px; max-width: calc(100% - 28px); max-height: calc(100dvh - 36px); color: var(--ig-ink); background: var(--ig-surface); box-shadow: 0 28px 100px #06172c66; }
.ig-dialog::backdrop { background: #071629ae; backdrop-filter: blur(2px); }
.ig-dialog[open] { display: flex; flex-direction: column; }
.ig-dialog-top { padding: 16px 24px 0; display: flex; gap: 14px; justify-content: space-between; align-items: center; flex-shrink: 0; }
.ig-dialog-top .ig-eyebrow { max-width: 500px; font-size: 10px; }
.ig-scope .ig-close { flex: 0 0 44px; width: 44px; height: 44px; border: 0; border-radius: 50%; background: var(--ig-subtle); color: var(--ig-ink); font: 400 30px/1 var(--font-sans); }
.ig-dialog-body { overflow: auto; overscroll-behavior: contain; padding: 0 30px 22px; }
.ig-scope .ig-dialog h2 { font: 600 32px/1.18 var(--font-serif); color: var(--ig-ink); margin: 7px 0 16px; }
.ig-dialog .ig-intro { font: 400 19px/1.5 var(--font-serif); color: var(--ig-muted); margin: 8px 0 18px; }
.ig-scope .ig-dialog h3 { font: 600 12px/1.5 var(--font-sans); text-transform: uppercase; letter-spacing: .08em; color: var(--ig-teal); margin: 22px 0 10px; }
.ig-dialog .ig-list { padding-left: 21px; margin: 0; }
.ig-dialog .ig-list li { margin: 9px 0; font: 400 15px/1.55 var(--font-sans); color: var(--ig-ink); }
.ig-dialog .ig-note { padding: 14px 16px; margin: 20px 0 0; border-left: 3px solid var(--ig-gold); background: var(--ig-note); font: 400 14px/1.55 var(--font-sans); color: var(--ig-ink); }
.ig-resources { border-top: 1px solid var(--ig-line); margin-top: 22px; }
.ig-links a { display: block; border: 1px solid var(--ig-card-line); border-radius: 6px; padding: 13px 15px; color: var(--ig-link); text-decoration: none; font: 600 14px/1.4 var(--font-sans); margin: 9px 0; background: var(--ig-surface); }
.ig-links a::after { content: ' \2192'; }
.ig-links a:hover { background: var(--ig-subtle); }
.ig-sources { font: 400 12px/1.5 var(--font-sans); color: var(--ig-muted); margin-top: 18px; overflow-wrap: anywhere; }
.ig-sources p { margin: 8px 0; }
.ig-scope .ig-sources a { color: inherit; }
.ig-educational { font: 400 11px/1.5 var(--font-sans); color: var(--ig-muted); margin: 14px 0 0; }
.ig-dialog-footer { background: var(--ig-subtle); border-top: 1px solid var(--ig-line); padding: 16px 24px; display: flex; gap: 15px; align-items: center; flex-shrink: 0; }
.ig-scope .ig-return { border: 1px solid var(--ig-gold); border-radius: 5px; background: var(--ig-navy); color: #fff; padding: 12px 17px; min-height: 44px; }
.ig-dialog-footer span { font: 400 12px/1.4 var(--font-sans); color: var(--ig-muted); }
.ig-scope [hidden] { display: none !important; }

/* Collection */
.ig-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; margin-bottom: 18px; }
.ig-card { display: flex; flex-direction: column; border: 1px solid var(--ig-card-line); border-radius: 8px; overflow: hidden; text-decoration: none; background: var(--ig-surface); box-shadow: 0 4px 20px #0716290c; }
.ig-card:hover { box-shadow: 0 7px 25px #07162928; }
.ig-card-preview { aspect-ratio: 6 / 5; overflow: hidden; background: #fff; }
.ig-card-preview img { width: 100%; height: 100%; object-fit: cover; object-position: top; display: block; }
.ig-card-copy { border-top: 1px solid var(--ig-card-line); padding: 16px 18px 18px; display: flex; flex-direction: column; flex: 1; }
.ig-card-copy .ig-eyebrow { font-size: 10px; }
.ig-scope .ig-card-copy h2 { font: 600 22px/1.2 var(--font-serif); color: var(--ig-ink); margin: 10px 0 14px; }
.ig-card-copy > span:last-child { margin-top: auto; font: 600 13px/1.4 var(--font-sans); color: var(--ig-link); }

/* Homepage: the full chart in place, with a way back */
.ig-map-dialog { border: 1px solid #aa873f; padding: 0; width: min(1120px, 96vw); max-width: 96vw; height: 94dvh; max-height: 94dvh; border-radius: 12px; background: var(--color-bg, #faf8f0); color: var(--ig-ink); }
.ig-map-dialog[open] { display: flex; flex-direction: column; }
.ig-map-dialog::backdrop { background: #050a12d9; }
.ig-map-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 12px 20px; border-bottom: 1px solid var(--ig-line); background: var(--ig-surface); flex-shrink: 0; }
.ig-scope .ig-map-head h2 { font: 600 24px/1.2 var(--font-serif); color: var(--ig-ink); margin: 2px 0 0; }
.ig-map-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.ig-map-actions a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 6px; font: 600 12px/1.3 var(--font-sans); }
.ig-scope .ig-map-back { min-height: 44px; padding: 10px 15px; border: 1px solid #aa873f; border-radius: 7px; background: var(--ig-navy); color: #fff; font: 600 14px/1.3 var(--font-sans); }
.ig-map-body { overflow: auto; overscroll-behavior: contain; padding: 18px 20px 24px; flex: 1; }
.ig-map-loading { font: 400 14px/1.5 var(--font-sans); color: var(--ig-muted); }

/* Installed-app download panel (downloads.js): sits in the page right after
   the links that opened it, never over them. */
.ig-dl-panel { margin: 0 0 18px; padding: 16px 18px; border: 1px solid var(--ig-card-line); border-top: 4px solid var(--ig-gold); border-radius: 8px; background: var(--ig-surface); color: var(--ig-ink); }
.ig-map-dialog .ig-dl-panel { margin: 10px 20px; max-height: 60dvh; overflow: auto; flex-shrink: 0; }
.ig-scope .ig-dl-title { font: 600 20px/1.25 var(--font-serif); color: var(--ig-ink); margin: 10px 0 4px; }
.ig-dl-file, .ig-dl-status, .ig-dl-help, .ig-dl-hint, .ig-dl-desc, .ig-dl-fallback p { font: 400 14px/1.5 var(--font-sans); color: var(--ig-muted); margin: 6px 0; }
.ig-dl-status { color: var(--ig-ink); }
.ig-dl-preview img { display: block; max-width: 100%; max-height: 260px; width: auto; height: auto; border: 1px solid var(--ig-line); background: #fff; margin: 8px 0; }
.ig-scope .ig-dl-back, .ig-scope .ig-dl-retry, .ig-scope .ig-dl-copy { min-height: 44px; padding: 10px 14px; border: 1px solid var(--ig-line); border-radius: 6px; background: var(--ig-surface); color: var(--ig-ink); }
.ig-scope .ig-dl-share { display: block; min-height: 48px; margin: 10px 0; padding: 12px 18px; border: 1px solid var(--ig-gold); border-radius: 6px; background: var(--ig-navy); color: #fff; }
.ig-scope .ig-dl-share:disabled { opacity: .55; cursor: default; }
.ig-dl-url { display: block; width: 100%; min-height: 44px; margin: 8px 0; padding: 10px; border: 1px solid var(--ig-line); border-radius: 5px; background: var(--ig-surface); color: var(--ig-ink); font: 400 13px/1.3 var(--font-sans); }
.ig-dl-panel > .ig-dl-back:last-child { margin-top: 10px; }

@media (max-width: 850px) {
  .ig-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .ig-page { padding: 12px 14px 4px; }
  .ig-head { margin-bottom: 16px; }
  .ig-head p { font-size: 16px; }
  .ig-downloads a { font-size: 12px; padding: 9px 11px; }
  .ig-controls { gap: 8px; }
  .ig-step-picker { flex-basis: 100%; min-width: 0; max-width: 100%; }
  .ig-step-picker select { font-size: 13px; }
  .ig-control { font-size: 12px; }
  .ig-chart.ig-enlarged { width: 850px; }
  .ig-plus { width: 18px; height: 18px; font-size: 14px; border-width: 1px; transform: translate(20%, -22%); }
  .ig-chart.ig-enlarged .ig-plus { width: 24px; height: 24px; font-size: 19px; border-width: 2px; }
  .ig-dialog { max-width: calc(100% - 20px); max-height: calc(100dvh - 20px); }
  .ig-dialog-top { padding: 10px 16px 0; }
  .ig-dialog-body { padding: 0 20px 18px; }
  .ig-scope .ig-dialog h2 { font-size: 27px; }
  .ig-dialog .ig-intro { font-size: 18px; }
  .ig-dialog-footer { padding: 13px 17px; gap: 10px; }
  .ig-dialog-footer span { font-size: 11px; }
  .ig-grid { gap: 14px; }
  .ig-card-copy { padding: 12px 14px 14px; }
  .ig-scope .ig-card-copy h2 { font-size: 19px; }
  .ig-map-dialog { width: 100vw; max-width: 100vw; height: 100dvh; max-height: 100dvh; border-radius: 0; border: 0; }
  .ig-map-head { padding: 10px 12px; }
  .ig-scope .ig-map-head h2 { font-size: 20px; }
  .ig-map-body { padding: 12px 10px 20px; }
}
@media (max-width: 420px) {
  .ig-grid { grid-template-columns: 1fr; }
  .ig-card-preview { aspect-ratio: 2 / 1; }
}
@media (prefers-reduced-motion: reduce) {
  .ig-hotspot, .ig-plus { transition: none !important; }
}
@media print {
  .ig-controls, .ig-hotspots, .ig-footnote, .ig-dialog, .ig-chart-nav, .ig-downloads, .ig-back { display: none !important; }
  .ig-viewport { border: 0; box-shadow: none; overflow: visible; }
  .ig-chart, .ig-chart.ig-enlarged { width: 100%; max-width: 100%; }
}