/* Data Stories - shared styles. System fonts only, no external requests. */
:root {
  /* colour scheme after Our World in Data's emphasis charts */
  --bg: #ffffff; --surface: #ffffff; --text: #2d2e2d; --muted: #5b5b5b; --faint: #858585; --line: #e2dedd;
  --accent: #a34743; --accent-soft: #f6eceb; --context: #a58f8c; --brand: #002147; --brand-line: #ce261e;
  --wordmark: #002147;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111214; --surface: #17181b; --text: #ecebea; --muted: #b3aeac; --faint: #8a8482; --line: #2b2a2c;
          --accent: #db6b65; --accent-soft: #2e1f1f; --context: #6b5956; --wordmark: #ecebea; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--sans);
       display: flex; flex-direction: column; min-height: 100vh; }
main { flex: 1; }
a { color: inherit; }
img { display: block; max-width: 100%; }
.wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* masthead */
.masthead { border-top: 4px solid var(--brand); box-shadow: inset 0 4px 0 -2px var(--brand-line); border-bottom: 1px solid var(--line); background: var(--surface); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
.wordmark { font: 700 22px/1 var(--serif); letter-spacing: -0.01em; text-decoration: none; color: var(--wordmark); }
.masthead nav { display: flex; align-items: center; gap: 4px; }
.masthead nav a { text-decoration: none; font-size: 15px; font-weight: 550; color: var(--muted);
                  padding: 8px 12px; border-radius: 8px; }
.masthead nav a:hover { color: var(--text); background: var(--accent-soft); }
.masthead nav a[aria-current="page"] { color: var(--accent); }

/* intro */
.intro { padding: 48px 0 8px; max-width: 760px; }
.intro h1 { font: 700 clamp(30px, 4.5vw, 44px)/1.15 var(--serif); margin: 0 0 12px; letter-spacing: -0.015em; }
.intro p { margin: 0; font-size: 19px; color: var(--muted); }

/* topic chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 24px 0 0; }
.chip { font: 550 14px/1 var(--sans); color: var(--muted); background: transparent; border: 1px solid var(--line);
        border-radius: 999px; padding: 8px 14px; cursor: pointer; }
.chip:hover { color: var(--text); border-color: var(--muted); }
.chip[aria-pressed="true"] { color: #fff; background: var(--accent); border-color: var(--accent); }

/* feed */
.feed { padding: 32px 0 64px; }
/* home: every story is a horizontal card, one below the other */
.feed-stack { display: flex; flex-direction: column; gap: 24px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
        transition: border-color .15s, box-shadow .15s, transform .15s; }
.card:hover { border-color: var(--accent); box-shadow: 0 8px 24px rgba(20, 20, 60, 0.08); transform: translateY(-2px); }
.card-link { display: flex; flex-direction: column; height: 100%; text-decoration: none; }
.card-link:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; border-radius: 14px; }
.card-img { aspect-ratio: 1200 / 630; overflow: hidden; background: var(--accent-soft); border-bottom: 1px solid var(--line); }
.card-img img { width: 100%; height: 100%; object-fit: cover; object-position: top left; }
.featured .card-img { display: grid; place-items: center; background: #f7f6f5; }
.featured .card-img img { object-fit: contain; object-position: center; }
.card-text { padding: 18px 20px 22px; }
.kicker { margin: 0 0 6px; font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.title { font: 700 18px/1.3 var(--serif); margin: 0 0 8px; letter-spacing: -0.005em; }
.summary { margin: 0 0 12px; color: var(--muted); font-size: 14.5px; line-height: 1.55; }
.byline { margin: 0; font-size: 13px; color: var(--faint); }

.featured .card-link { flex-direction: row; }
.featured .card-img { flex: 0 0 60%; border-bottom: 0; border-right: 1px solid var(--line); }
.featured .card-text { display: flex; flex-direction: column; justify-content: center; padding: 28px 32px; }
.featured .title { font-size: clamp(21px, 1.9vw, 25px); line-height: 1.25; margin-bottom: 12px; }
.featured .summary { font-size: 15.5px; margin-bottom: 14px; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 24px; }
@media (max-width: 960px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 760px) {
  .featured .card-link { flex-direction: column; }
  .featured .card-img { flex: none; border-right: 0; border-bottom: 1px solid var(--line); }
  .featured .card-text { padding: 20px 20px 24px; }
}
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } .wrap { padding: 0 16px; } }


/* LinkedIn icon + author */
.masthead nav a.nav-icon { display: inline-grid; place-items: center; padding: 8px; color: var(--muted); }
.masthead nav a.nav-icon:hover { color: #0a66c2; }
@media (prefers-color-scheme: dark) { .masthead nav a.nav-icon:hover { color: #71b7fb; } }
svg.li { display: block; flex: none; }
.author { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; color: var(--text); text-decoration: none; }
a.author svg { color: #0a66c2; }
@media (prefers-color-scheme: dark) { a.author svg { color: #71b7fb; } }
a.author:hover span { text-decoration: underline; text-underline-offset: 3px; }

/* article */
.story { --col: 700px; padding: 48px 0 72px; }
.story > * { max-width: var(--col); margin-left: auto; margin-right: auto; }
.story-head h1 { font: 700 clamp(30px, 4.6vw, 46px)/1.12 var(--serif); letter-spacing: -0.015em; margin: 0 0 16px; }
.dek { font-size: 20px; line-height: 1.5; color: var(--muted); margin: 0 0 20px; }
.story-byline { margin: 0; padding: 14px 0 22px; border-bottom: 1px solid var(--line); font-size: 15px; }
.prose { font: 18px/1.7 var(--serif); }
.prose p, .prose ol { margin: 0 0 1.1em; }
.prose h2 { font: 700 26px/1.25 var(--serif); letter-spacing: -0.01em; margin: 1.9em 0 .55em; }
.prose h3 { font: 700 18px/1.3 var(--sans); margin: 0 0 .6em; }
.prose a { color: var(--accent); text-underline-offset: 3px; }
.story > .prose:first-of-type { padding-top: 28px; }
.formula { font-family: var(--sans); font-size: 18px; display: flex; align-items: center; gap: 12px; justify-content: center;
           background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.formula > span:first-child { font-weight: 700; }
.frac { display: inline-grid; text-align: center; }
.frac > span:first-child { border-bottom: 2px solid currentColor; padding: 0 6px 4px; }
.frac > span:last-child { padding: 4px 6px 0; }
.checklist { padding-left: 1.3em; }
.checklist li { margin: 0 0 .6em; padding-left: .2em; }

/* embedded charts from the Table / Map pages */
.story > .embed-fig { max-width: 820px; margin: 28px auto 36px; }
.story > .embed-fig.wide { max-width: 1100px; }
/* desktop: wide embeds (the Telangana projects table and map) break out of the 700px column, like the wide ownership chart */
@media (min-width: 1180px) {
  .story > .embed-fig.wide { width: min(1200px, calc(100vw - 32px)); max-width: none; position: relative; left: 50%; transform: translateX(-50%); }
}
.embed-fig iframe { display: block; width: 100%; height: 480px; border: 0; background: transparent; color-scheme: normal; }
.embed-fig iframe.map { height: 600px; border-radius: 14px; border: 1px solid var(--line); }
.howto { max-width: 700px; margin: 14px auto 0; font: 15.5px/1.6 var(--sans); color: var(--muted);
         border-left: 3px solid var(--accent); padding: 2px 0 2px 16px; }
.howto b { color: var(--text); }

.explore { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px !important; margin-bottom: 32px !important; }
.explore-card { display: grid; gap: 6px; text-decoration: none; background: var(--surface); border: 1px solid var(--line);
                border-radius: 14px; padding: 18px 20px; transition: border-color .15s; }
.explore-card:hover { border-color: var(--accent); }
.explore-card strong { font: 700 18px/1.3 var(--serif); color: var(--accent); }
.explore-card span { font-size: 15px; color: var(--muted); }
.method { margin-top: 24px !important; padding: 20px 22px; border: 1px solid var(--line); border-radius: 14px;
          background: var(--surface); font: 15px/1.6 var(--sans) !important; color: var(--muted); }
.method p:last-child { margin-bottom: 0; }
@media (max-width: 640px) {
  .story { padding-top: 32px; }
  .explore { grid-template-columns: 1fr; }
  .embed-fig iframe.map { height: 460px; }
}

/* inline SVG charts (password article). Series colours validated with the dataviz palette checker. */
:root { --s-accent: #a34743; --s-blue: #2a78d6; --s-context: #a58f8c; --grid: #ecebea; --axis: #c9c4c3; }
@media (prefers-color-scheme: dark) {
  :root { --s-accent: #db6b65; --s-blue: #3987e5; --s-context: #6b5956; --grid: #26262a; --axis: #45434a; }
}
.story > .chart-fig { max-width: 820px; margin: 28px auto 36px; }
.chart-title { font: 700 17px/1.35 var(--sans); margin: 0 0 12px; color: var(--text); }
.chart { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px 10px; }
.viz-plot { width: 100%; }
svg.viz { display: block; overflow: visible; font-family: var(--sans); }
svg.viz .lab { font-size: 14px; fill: var(--text); }
svg.viz .lab.mono, .story code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
svg.viz .lab.mono { font-size: 13.5px; }
svg.viz .val { font-size: 13px; fill: var(--muted); font-variant-numeric: tabular-nums; }
svg.viz .tick { font-size: 12px; fill: var(--faint); font-variant-numeric: tabular-nums; }
svg.viz .grid { stroke: var(--grid); stroke-width: 1; }
svg.viz .axis { stroke: var(--axis); stroke-width: 1; }
svg.viz .hit { fill: transparent; }
svg.viz .mark { cursor: default; outline: none; }
svg.viz .mark.hover .hit { fill: var(--accent-soft); }
svg.viz .mark:focus-visible .hit { stroke: var(--accent); stroke-width: 2; }
.bar.s-accent, .swatch.s-accent, .key.s-accent { fill: var(--s-accent); background: var(--s-accent); }
.bar.s-blue, .swatch.s-blue, .key.s-blue { fill: var(--s-blue); background: var(--s-blue); }
.bar.s-context { fill: var(--s-context); }
.viz-legend { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 0 0 10px; font: 14px/1.3 var(--sans); color: var(--muted); }
.viz-legend span { display: inline-flex; align-items: center; gap: 7px; }
.viz-legend .swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.viz-tip { position: fixed; z-index: 50; pointer-events: none; background: var(--surface); color: var(--text);
           border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 6px 20px rgba(0, 0, 0, .14);
           padding: 8px 12px; font: 13px/1.45 var(--sans); max-width: 280px; }
.viz-tip-title { color: var(--muted); margin-bottom: 2px; }
.viz-tip-row { display: flex; align-items: center; gap: 7px; }
.viz-tip-row strong { font-size: 14px; font-variant-numeric: tabular-nums; }
.viz-tip-row span:last-child { color: var(--muted); }
.viz-tip .key { width: 12px; height: 2px; border-radius: 1px; display: inline-block; }
.viz-table { margin: 8px 0 4px; font: 14px/1.5 var(--sans); }
.viz-table summary { cursor: pointer; color: var(--muted); font-size: 13.5px; padding: 4px 0; }
.viz-table summary:hover { color: var(--text); }
.viz-table table { border-collapse: collapse; width: 100%; margin-top: 6px; }
.viz-table th, .viz-table td { text-align: left; padding: 5px 8px; border-bottom: 1px solid var(--line); }
.viz-table th { font-weight: 600; color: var(--muted); }
.viz-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.story code { font-size: .88em; background: var(--accent-soft); padding: 1px 5px; border-radius: 5px; }
.prose ul.checklist { padding-left: 1.3em; margin: 0 0 1.1em; }

/* password checker */
.checker { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px;
           font-family: var(--sans); }
.checker label { display: block; font-weight: 700; margin-bottom: 8px; }
.checker-row { display: flex; gap: 8px; flex-wrap: wrap; }
.checker input { flex: 1 1 220px; min-width: 0; font: 16px/1.3 ui-monospace, SFMono-Regular, Menlo, monospace;
                 padding: 10px 12px; border: 1px solid var(--axis); border-radius: 10px; background: var(--bg); color: var(--text); }
.checker input:focus { outline: 3px solid var(--accent-soft); border-color: var(--accent); }
.checker button { font: 600 15px/1 var(--sans); padding: 10px 16px; border-radius: 10px; cursor: pointer;
                  border: 1px solid var(--line); background: transparent; color: var(--muted); }
.checker button:hover { color: var(--text); border-color: var(--muted); }
.checker .checker-go { background: var(--accent); border-color: var(--accent); color: #fff; }
.checker .checker-go:hover { filter: brightness(1.08); color: #fff; }
.checker-sent { margin: 12px 0 0; font-size: 14px; color: var(--muted); word-break: break-all; }
.checker-sent code { font-weight: 700; color: var(--text); }
.checker-result:empty { display: none; }
.checker-result { margin-top: 12px; padding: 10px 14px; border-radius: 10px; font-size: 15px; border: 1px solid var(--line); }
.checker-result.bad { border-color: var(--s-accent); background: var(--accent-soft); }
.checker-result.bad strong::before { content: "\26A0\FE0E  "; }
.checker-result.good strong::before { content: "\2713  "; }
.checker-result.busy { color: var(--muted); }

/* footer */
.foot { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; padding: 22px 0; }
.foot a { color: var(--muted); }
.foot a:hover { color: var(--text); }

@media (prefers-reduced-motion: reduce) { .card { transition: none; } .card:hover { transform: none; } }

/* /tata-holdings/ ownership charts. Node hues: validated 3-slot set (aqua/blue/orange, light + dark, all-pairs);
   unlisted = hollow blue ring, cross-holdings = dashed accent lines, so identity is never colour alone. */
:root { --k-trust: #1baf7a; --k-tata: #2a78d6; --k-out: #eb6834; --k-ctx: #a58f8c; }
@media (prefers-color-scheme: dark) { :root { --k-trust: #199e70; --k-tata: #3987e5; --k-out: #d95926; --k-ctx: #6b5956; } }
.swatch.k-trust, .seg.k-trust { background: var(--k-trust); fill: var(--k-trust); }
.swatch.k-tata, .seg.k-tata, .swatch.k-holdco { background: var(--k-tata); fill: var(--k-tata); }
.swatch.k-out, .seg.k-out { background: var(--k-out); fill: var(--k-out); }
.swatch.k-family, .seg.k-family, .swatch.k-context, .seg.k-context { background: var(--k-ctx); fill: var(--k-ctx); }
.viz-tip .key.k-tata { background: var(--k-tata); } .viz-tip .key.k-context { background: var(--k-ctx); } .viz-tip .key.k-out { background: var(--k-out); }
.viz-tip .key { height: 10px; width: 10px; border-radius: 2px; }
.swatch.k-unlisted { background: transparent; box-shadow: inset 0 0 0 2px var(--k-tata); border-radius: 50% !important; }
.swatch.line-cross { height: 0 !important; width: 18px !important; border-radius: 0 !important; border-top: 2px dashed var(--s-accent); }
svg.viz .seg-lab { font: 600 13px var(--sans); fill: #fff; }
svg.viz .mark.hover .seg { opacity: .82; }
.story > .chart-fig.wide { max-width: none; width: min(1400px, calc(100vw - 32px)); position: relative; left: 50%; transform: translateX(-50%); }
.net-swipe { display: none; margin: 0 0 6px; font: 13px var(--sans); color: var(--faint); }
.net-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin: 0 0 10px; font: 14px/1.3 var(--sans); color: var(--muted); }
.net-pick { font: 14px var(--sans); padding: 7px 10px; border-radius: 9px; border: 1px solid var(--axis); background: var(--bg); color: var(--text); max-width: 100%; }
.net-toggle { display: inline-flex; align-items: center; gap: 4px; cursor: pointer; }
.net-reset { font: 550 13px var(--sans); padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); background: transparent; color: var(--muted); cursor: pointer; }
.net-reset:hover { color: var(--text); border-color: var(--muted); }
.chart[data-chart="network"] { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 0 18px; }
.chart[data-chart="network"] > .net-controls, .chart[data-chart="network"] > .viz-legend,
.chart[data-chart="network"] > .viz-table, .chart[data-chart="network"] > .net-swipe { grid-column: 1 / -1; }
.net-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
svg.net { width: 100%; min-width: 760px; height: auto; }
svg.net .band { font: 700 14px var(--sans); fill: var(--muted); letter-spacing: .02em; text-transform: uppercase; }
svg.net .band-sub { font: 600 13px var(--sans); fill: var(--faint); }
svg.net .edge { fill: none; stroke: var(--axis); stroke-opacity: .6; transition: opacity .15s, stroke .15s; }
svg.net .edge.cross { stroke: var(--s-accent); stroke-dasharray: 5 3; stroke-opacity: 1; }
svg.net .edge.off { opacity: 0; }
svg.net .edge.dim { opacity: .07; }
svg.net .edge.rel { stroke: var(--text); stroke-opacity: .9; opacity: 1; }
svg.net .edge.cross.rel { stroke: var(--s-accent); }
svg.net .node { cursor: pointer; transition: opacity .15s; }
svg.net .node .dot { stroke: var(--surface); stroke-width: 2; }
svg.net .k-trust .dot { fill: var(--k-trust); }
svg.net .k-holdco .dot, svg.net .k-tata .dot { fill: var(--k-tata); }
svg.net .k-unlisted .dot { fill: var(--surface); stroke: var(--k-tata); stroke-width: 2.5; }
svg.net .k-out .dot { fill: var(--k-out); }
svg.net .k-family .dot { fill: var(--k-ctx); }
svg.net .node.dim { opacity: .18; }
svg.net .node.sel .dot { stroke: var(--text); stroke-width: 3; }
svg.net .node:focus-visible .hit { stroke: var(--accent); stroke-width: 2; }
svg.net .lab.small { font-size: 13px; fill: var(--muted); }
svg.net .lab.big { font: 700 17px var(--sans); fill: var(--text); }
svg.net .node.sel .lab, svg.net .node.hover .lab { fill: var(--text); }
.net-panel { font: 14.5px/1.5 var(--sans); border-left: 1px solid var(--line); padding: 4px 0 4px 16px; max-height: 1100px; overflow-y: auto; }
.net-panel h3 { margin: 0 0 2px; font-size: 18px; line-height: 1.3; }
.net-panel h4 { margin: 14px 0 4px; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.net-meta, .net-note, .net-hint { margin: 0 0 6px; color: var(--muted); font-size: 14px; }
.net-list { list-style: none; margin: 0; padding: 0; }
.net-list li { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 8px; padding: 4px 0; border-bottom: 1px solid var(--line); }
.net-list strong { min-width: 52px; font-variant-numeric: tabular-nums; }
.net-list .linkish { font: inherit; color: var(--text); background: none; border: 0; padding: 0; cursor: pointer; text-align: left;
                     text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; }
.net-list .linkish:hover { text-decoration-color: var(--text); }
.net-list .tag { font-size: 11.5px; color: var(--s-accent); border: 1px dashed var(--s-accent); border-radius: 999px; padding: 0 7px; }
.net-list .src { font-size: 12px; color: var(--faint); margin-left: auto; }
@media (max-width: 860px) {
  .chart[data-chart="network"] { grid-template-columns: minmax(0, 1fr); }
  .net-swipe { display: block; }
  .net-panel { border-left: 0; border-top: 1px solid var(--line); padding: 12px 0 4px; max-height: none; }
}