/* Connection Index — data journalism: Swiss grid, mono numerals, calm slate ramp + one signal colour (vermilion). */
:root {
  --paper: #f3f2ee; --card: #fbfaf7; --ink: #121212; --soft: #50504b; --faint: #6f6e67; --line: #d9d7cf; --rule: #121212;
  --sig: #c93a1b; --sig-soft: #fbe3dc; --sig-on-dark: #ff7a57;
  --s1: #e1e8ee; --s2: #bfd0dd; --s3: #94b2c8; --s4: #6890ad; --s5: #3f6f92; --s6: #1e4c70;
  --serif: 'Newsreader', Georgia, serif; --sans: 'IBM Plex Sans', system-ui, sans-serif; --mono: 'IBM Plex Mono', ui-monospace, monospace;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.55 var(--sans); }
body { overflow-x: hidden; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
button { font: inherit; color: inherit; }
::selection { background: var(--sig-soft); color: var(--ink); }
:focus-visible { outline: 2px solid var(--sig); outline-offset: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 clamp(16px, 4vw, 40px); }
.label { font: 500 11px var(--mono); text-transform: uppercase; letter-spacing: .14em; margin: 0 0 18px; display: flex; justify-content: space-between; gap: 12px; padding-top: 10px; border-top: 2px solid var(--rule); }
.label-note { color: var(--faint); }

.mast { border-bottom: 1px solid var(--rule); background: var(--paper); position: sticky; top: 0; z-index: 10; }
.mast-in { display: flex; align-items: center; gap: 20px; height: 52px; }
.brand { font: 400 15px var(--sans); text-decoration: none; letter-spacing: -.01em; }
.brand b { font-weight: 700; margin-left: 3px; }
.brand::before { content: ''; display: inline-block; width: 10px; height: 10px; background: var(--sig); margin-right: 8px; vertical-align: 0; }
.mast-meta { font: 11px var(--mono); color: var(--soft); text-transform: uppercase; letter-spacing: .08em; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mast-cta { font: 600 13px var(--sans); text-decoration: none; color: var(--sig); white-space: nowrap; padding: 10px 0; }
.mast-cta:hover { text-decoration: underline; text-underline-offset: 3px; }

.hero { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px; padding-top: clamp(36px, 6vw, 72px); padding-bottom: 40px; }
.hero-text { grid-column: 1 / 9; }
h1 { font: 500 clamp(40px, 6.6vw, 92px)/.98 var(--serif); letter-spacing: -.025em; margin: 0 0 24px; max-width: 14ch; }
h1 em { font-style: italic; font-weight: 400; color: var(--sig); }
.dek { font: 400 clamp(18px, 1.8vw, 21px)/1.5 var(--serif); color: var(--soft); max-width: 56ch; margin: 0 0 28px; }
.switch { display: inline-flex; border: 1px solid var(--ink); }
.switch button { border: 0; background: none; padding: 10px 16px; font: 500 14px var(--sans); cursor: pointer; }
.switch button + button { border-left: 1px solid var(--ink); }
.switch button.on { background: var(--ink); color: var(--paper); }
.hero-fig { grid-column: 9 / 13; align-self: end; border-top: 2px solid var(--rule); padding-top: 12px; }
.hero-fig .k { font: 500 11px var(--mono); text-transform: uppercase; letter-spacing: .14em; color: var(--faint); }
.hero-fig .big { font: 500 clamp(64px, 8vw, 112px)/1 var(--mono); letter-spacing: -.05em; margin: 10px 0 4px; font-variant-numeric: tabular-nums; }
.hero-fig .big small { font-size: .28em; color: var(--faint); letter-spacing: 0; }
.hero-fig .who { font: 500 22px var(--serif); }
.hero-fig dl { display: grid; grid-template-columns: 1fr auto; margin: 16px 0 0; border-top: 1px solid var(--line); }
.hero-fig dt, .hero-fig dd { padding: 7px 0; border-bottom: 1px solid var(--line); margin: 0; font-size: 14px; }
.hero-fig dd { font: 500 14px var(--mono); text-align: right; }
.hero-fig dd.s { color: var(--sig); }

.block { margin-top: clamp(48px, 7vw, 84px); }
.mapgrid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 32px; align-items: start; }
.tiles { display: grid; grid-template-columns: repeat(11, 1fr); gap: 3px; }
.tile { aspect-ratio: 1; border: 0; padding: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; font: 600 clamp(11px, 1.25vw, 13px)/1.1 var(--mono); cursor: pointer; transition: outline-offset .12s; outline: 2px solid transparent; outline-offset: 0; font-variant-numeric: tabular-nums; }
.tile small { font: 400 clamp(10px, .95vw, 11px) var(--mono); opacity: .9; }
.tile:hover, .tile:focus-visible { outline: 2px solid var(--ink); outline-offset: 1px; }
.tile.on { outline: 3px solid var(--sig); outline-offset: 2px; position: relative; z-index: 1; }
.tile.na { background: transparent; border: 1px dashed var(--line); color: var(--faint); cursor: default; }
.scale { display: flex; align-items: center; gap: 0; margin-top: 16px; font: 11px var(--mono); color: var(--soft); }
.scale i { width: 34px; height: 10px; display: block; }
.scale span { margin: 0 10px; }
.side { border-top: 2px solid var(--rule); padding-top: 14px; }
.side .k { font: 500 11px var(--mono); text-transform: uppercase; letter-spacing: .14em; color: var(--faint); }
.side h3 { font: 500 clamp(30px, 3.4vw, 42px)/1.05 var(--serif); margin: 6px 0 6px; }
.side .big { font: 500 56px/1 var(--mono); letter-spacing: -.04em; color: var(--sig); font-variant-numeric: tabular-nums; }
.side .big small { font: 500 12px var(--mono); color: var(--soft); letter-spacing: 0; }
.bars { list-style: none; padding: 0; margin: 20px 0 0; }
.bars li { display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.bars .v { font: 500 14px var(--mono); text-align: right; font-variant-numeric: tabular-nums; }
.bars .v small { color: var(--faint); font-weight: 400; margin-left: 6px; }
.bars .b { grid-column: 1 / -1; height: 4px; background: var(--line); position: relative; }
.bars .b i { position: absolute; left: 0; top: 0; bottom: 0; background: var(--ink); }

.findings { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; }
.finding { padding: 0 20px 6px; border-left: 1px solid var(--line); }
.finding:first-child { border-left: 0; padding-left: 0; }
.finding .i { font: 11px var(--mono); color: var(--faint); }
.finding .n { font: 500 clamp(40px, 4.4vw, 58px)/1 var(--mono); letter-spacing: -.04em; color: var(--sig); margin: 10px 0 10px; font-variant-numeric: tabular-nums; }
.finding p { font: 400 18px/1.4 var(--serif); margin: 0; }

.note { color: var(--soft); max-width: 70ch; margin: 0 0 14px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.legend button { border: 1px solid var(--line); background: var(--card); padding: 8px 12px; min-height: 36px; font: 12px var(--mono); cursor: pointer; display: inline-flex; align-items: center; gap: 7px; }
.legend button:hover { border-color: var(--ink); }
.legend button i { width: 9px; height: 9px; border-radius: 50%; background: var(--faint); }
.legend button.on { border-color: var(--sig); background: var(--sig-soft); }
.legend button.on i { background: var(--sig); }
.axis { display: grid; grid-template-columns: 1fr auto 1fr; margin-left: 210px; margin-right: 70px; font: 10px var(--mono); text-transform: uppercase; letter-spacing: .1em; color: var(--faint); padding-bottom: 6px; border-bottom: 1px solid var(--ink); }
.axis span:last-child { text-align: right; }
.rank { list-style: none; margin: 0; padding: 0; }
.rank li { display: grid; grid-template-columns: 34px 160px 1fr 54px; gap: 16px; align-items: center; padding: 6px 0; border-bottom: 1px solid var(--line); cursor: pointer; }
.rank li:hover, .rank li:focus-visible { background: var(--card); outline-offset: -2px; }
.rank li.on { background: var(--sig-soft); }
.rank .r { font: 12px var(--mono); color: var(--faint); font-variant-numeric: tabular-nums; }
.rank .c { font-weight: 500; font-size: 15px; }
.rank .s { font: 500 22px var(--mono); text-align: right; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.track { position: relative; height: 22px; }
.track::before { content: ''; position: absolute; left: 0; right: 0; top: 50%; border-top: 1px solid var(--line); }
.track::after { content: ''; position: absolute; left: 50%; top: 3px; bottom: 3px; border-left: 1px dotted var(--faint); }
.track i { position: absolute; top: 50%; width: 9px; height: 9px; border-radius: 50%; transform: translate(-50%, -50%); background: #b4b2aa; box-shadow: 0 0 0 2px var(--paper); transition: background .2s, opacity .2s; }
.track b { position: absolute; top: 1px; bottom: 1px; width: 3px; background: var(--ink); transform: translateX(-50%); }
.rank.hl .track i { opacity: .35; }
.rank.hl .track i.on { opacity: 1; background: var(--sig); width: 11px; height: 11px; z-index: 1; }

.act { border-top: 0; }
.act-grid { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: 40px; }
.act h2 { font: 500 clamp(30px, 3.8vw, 50px)/1.04 var(--serif); letter-spacing: -.02em; margin: 0 0 18px; }
.act h2 em { color: var(--sig); font-weight: 400; }
.act-lead { font: 400 19px/1.5 var(--serif); color: var(--soft); margin: 0; max-width: 52ch; }
.how { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--ink); }
.how li { display: grid; grid-template-columns: 44px 1fr; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--soft); font-size: 15px; }
.how li span { font: 500 28px/1 var(--mono); color: var(--sig); font-variant-numeric: tabular-nums; }
.how b { display: block; color: var(--ink); font-weight: 600; font-size: 16px; margin-bottom: 2px; }
.app { margin-top: 36px; background: var(--ink); color: var(--paper); padding: clamp(22px, 3vw, 34px); display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: center; gap: clamp(22px, 4vw, 48px); }
.app-main { display: grid; gap: 22px; }
.app-id { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
.app-id img { width: 56px; height: 56px; border-radius: 13px; flex: none; outline: 1px solid #3a3a3a; }
/* real App Store screenshots, set like editorial figures keyed to the steps above */
.app-shots { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.app-shots figure { margin: 0; }
.app-shots img { display: block; width: 100%; height: auto; border-radius: 16px; outline: 1px solid #3a3a3a; outline-offset: 3px; }
.app-shots figcaption { margin-top: 10px; padding-top: 8px; border-top: 1px solid #3a3a3a; font: 500 12px var(--mono); color: #bdbbb3; letter-spacing: .02em; }
.app-shots figcaption span { color: var(--sig-on-dark); margin-right: 8px; }
.app h3 { font: 500 clamp(24px, 2.6vw, 32px)/1.1 var(--serif); margin: 0 0 4px; }
.app p { margin: 0; color: #bdbbb3; font-size: 15px; }
.stores { display: flex; flex-wrap: wrap; gap: 10px; }
.store { display: inline-flex; align-items: center; gap: 10px; background: #000; color: #fff; text-decoration: none; padding: 8px 16px 8px 12px; border-radius: 10px; border: 1px solid #6b6b6b; font: 600 18px/1.05 var(--sans); min-height: 48px; }
.store:hover { border-color: #fff; }
.store svg { width: 24px; height: 24px; flex: none; }
.store small { display: block; font: 500 11px var(--sans); opacity: .9; }
.alt { font: 400 17px var(--serif); color: var(--soft); margin: 18px 0 0; }
.alt a { color: var(--ink); font-weight: 500; }

.method .cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.method h3 { font: 600 15px var(--sans); margin: 0 0 8px; }
.method h3 + p, .method p + h3 { margin-top: 0; }
.method p, .method li { color: var(--soft); font-size: 15px; }
.method ul { padding-left: 18px; margin-top: 0; }
.method #sources h3 { margin-top: 0; }
.cite { white-space: pre-wrap; font: 12px/1.5 var(--mono); background: var(--card); border: 1px solid var(--line); padding: 12px; }
.faq details { border-top: 1px solid var(--line); padding: 10px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 500; font-size: 15px; }
.faq details p { margin: 8px 0 0; }
.bridge { margin: 56px 0 0; border-top: 1px solid var(--line); padding-top: 16px; font: 400 18px/1.5 var(--serif); color: var(--soft); max-width: 70ch; }

.foot { margin-top: 60px; border-top: 2px solid var(--rule); padding: 18px 0 100px; }
.foot .src { font: 12px/1.6 var(--mono); color: var(--faint); margin: 0 0 36px; max-width: 90ch; }
.eco { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 24px; }
.eco li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.eco a { font: 600 14px var(--mono); text-decoration: none; display: block; }
.eco a:hover { color: var(--sig); }
.eco span { font-size: 13px; color: var(--soft); }
.eco .here a::before { content: '■ '; color: var(--sig); }

.sticky { position: fixed; right: 16px; bottom: 16px; z-index: 20; display: flex; align-items: center; gap: 12px; background: var(--ink); color: var(--paper); padding: 8px 8px 8px 14px; font: 13px var(--sans); box-shadow: 0 8px 24px rgba(0,0,0,.2); max-width: calc(100% - 32px); }
.sticky a { background: var(--sig); color: #fff; text-decoration: none; font-weight: 600; padding: 10px 14px; white-space: nowrap; }
.sticky button { border: 0; background: none; color: #bdbbb3; font-size: 20px; line-height: 1; cursor: pointer; padding: 8px 10px; min-width: 40px; min-height: 40px; }
.tip { position: fixed; z-index: 30; pointer-events: none; background: var(--ink); color: var(--paper); font: 12px/1.4 var(--mono); padding: 6px 9px; max-width: 240px; }

@media (prefers-reduced-motion: reduce) { .tile, .track i { transition: none; } }
@media (max-width: 900px) {
  .hero-text, .hero-fig { grid-column: 1 / -1; }
  .mapgrid, .act-grid { grid-template-columns: 1fr; }
  .app { grid-template-columns: 1fr; }
  .findings { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 28px; }
  .finding:nth-child(3) { border-left: 0; padding-left: 0; }
  .method .cols, .eco { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .mast-meta { display: none; }
  .mast-in { justify-content: space-between; }
  .findings { grid-template-columns: 1fr; }
  .finding { border-left: 0; padding: 0 0 18px; border-bottom: 1px solid var(--line); }
  .rank li { grid-template-columns: 26px 1fr 44px; gap: 4px 10px; }
  .rank .track { grid-column: 2 / 4; grid-row: 2; }
  .axis { margin-left: 36px; margin-right: 0; }
  .method .cols, .eco { grid-template-columns: 1fr; }
  .sticky { left: 12px; right: 12px; bottom: 12px; max-width: none; }
  .sticky span { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .tiles { gap: 2px; }
  .tile small { display: none; }
  .store { flex: 1 1 150px; }
  .app-shots { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none; margin: 0 -22px; padding: 4px 22px 6px; overscroll-behavior-x: contain; }
  .app-shots::-webkit-scrollbar { display: none; }
  .app-shots figure { flex: 0 0 min(58vw, 230px); scroll-snap-align: center; }
}

/* data notes */
.note-page .hero-note { padding-top: clamp(32px, 5vw, 64px); }
.note-page h1 { max-width: 20ch; }
.caveat { border-left: 3px solid var(--sig); background: var(--card); padding: 12px 16px; max-width: 70ch; margin: 0 0 24px; color: var(--soft); }
.kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin: 0; border-top: 2px solid var(--rule); padding-top: 12px; }
.kpis dt { font: 500 11px var(--mono); text-transform: uppercase; letter-spacing: .14em; color: var(--faint); }
.kpis dd { margin: 4px 0 0; font: 500 clamp(28px, 4vw, 48px)/1 var(--mono); letter-spacing: -.04em; color: var(--sig); font-variant-numeric: tabular-nums; }
.chart { width: 100%; height: auto; display: block; margin-bottom: 20px; }
.chart .cl { font: 12px var(--sans); fill: var(--ink); }
.chart .cv { font: 500 12px var(--mono); fill: var(--soft); }
.chart .cb { fill: var(--s6); }
.tbl { margin: 0 0 8px; }
.tbl summary { cursor: pointer; font: 500 13px var(--mono); margin-bottom: 8px; }
.note-page table { border-collapse: collapse; width: 100%; max-width: 720px; font-size: 14px; }
.note-page th, .note-page td { text-align: left; padding: 7px 10px 7px 0; border-bottom: 1px solid var(--line); font-weight: 400; }
.note-page thead th { font: 500 11px var(--mono); text-transform: uppercase; letter-spacing: .1em; color: var(--faint); border-bottom: 1px solid var(--ink); }
.note-page td { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.note-page tbody th { font-weight: 500; }
.obs { padding-left: 22px; max-width: 72ch; font: 400 18px/1.5 var(--serif); }
.obs li { margin-bottom: 14px; color: var(--soft); }
.obs b { color: var(--ink); font-weight: 600; }
.note-page .act-grid { margin-top: 0; }
@media (max-width: 600px) { .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); } }