/* ============================================================================
   ByteCosts — Articles (shared)
   Editorial chrome + scrollytelling layout + Research index, in the Ledger
   language. Per-article visualisations add their own styles on top.
   ============================================================================ */
body{background:var(--paper); overflow-x:hidden;}
::selection{background:var(--bc-teal-100); color:var(--ink);}

/* ---------- progress ---------- */
.art-progress{position:fixed; top:0; left:0; height:3px; width:0; background:var(--accent); z-index:60; transition:width 80ms linear;}

/* ---------- ticker ---------- */
.art-ticker{border-bottom:var(--bw-hair) solid var(--ink); background:var(--paper);}
.art-ticker-inner{display:flex; align-items:center; height:32px; max-width:1280px; margin:0 auto; padding:0 36px;
  font-family:var(--mono); font-size:.66rem; letter-spacing:.05em; color:var(--ink-soft); white-space:nowrap; overflow:hidden;}
.art-ticker .t{display:inline-flex; align-items:center; gap:7px; padding-right:24px; margin-right:24px; border-right:var(--bw-hair) solid var(--rule-soft);}
.art-ticker .t:last-child{border:none;}
.art-ticker .t b{color:var(--ink); font-weight:600;}
.art-ticker .live-dot{width:6px; height:6px; border-radius:50%; background:var(--up); animation:bc-pulse 1.6s infinite;}

/* ---------- masthead ---------- */
.art-mast{border-bottom:var(--bw-heavy) solid var(--ink); background:var(--paper); position:sticky; top:0; z-index:50;}
.art-mast-inner{display:flex; align-items:center; justify-content:space-between; gap:24px; max-width:1280px; margin:0 auto; padding:16px 36px;}
.art-brand{display:flex; align-items:center; gap:12px; color:var(--ink);}
.art-brand .mark{width:36px; height:36px; border:var(--bw) solid var(--ink); border-radius:var(--r-sm); display:grid; place-items:center; color:var(--accent); background:var(--card);}
.art-brand .bn{font-family:var(--disp); font-weight:800; font-size:1.3rem; line-height:1; letter-spacing:-.01em;}
.art-brand .bn .c{color:var(--accent);}
.art-brand .bs{display:block; font-family:var(--mono); font-size:.5rem; letter-spacing:.18em; text-transform:uppercase; color:var(--ink-soft); margin-top:5px;}
.art-mast .back{font-family:var(--mono); font-size:.74rem; color:var(--ink-2); display:inline-flex; align-items:center; gap:8px; padding-bottom:2px; border-bottom:var(--bw) solid transparent;}
.art-mast .back:hover{border-color:var(--accent); color:var(--ink);}

.art-wrap{max-width:1280px; margin:0 auto; padding:0 36px;}
@media(max-width:680px){ .art-ticker-inner,.art-mast-inner,.art-wrap{padding-left:20px; padding-right:20px;} }

/* ---------- article head ---------- */
.art-head{padding:60px 0 30px; max-width:760px;}
.art-head .kick{display:flex; align-items:center; gap:12px; margin-bottom:22px;}
.art-head .kick .dot{width:6px; height:6px; border-radius:50%; background:var(--accent);}
.art-head h1{font-size:clamp(2.5rem,5.2vw,3.9rem); line-height:1.03; margin-bottom:20px;}
.art-head .dek{font-size:1.28rem; line-height:1.5; color:var(--ink-2);}
.art-head .byline{display:flex; gap:18px; flex-wrap:wrap; margin-top:26px; padding-top:18px; border-top:var(--bw) solid var(--ink);
  font-family:var(--mono); font-size:.72rem; color:var(--ink-soft);}
.art-head .byline b{color:var(--ink); font-weight:600;}

/* ---------- scrollytelling grid ---------- */
.art-scrolly{display:grid; grid-template-columns:1fr 412px; gap:64px; align-items:start; padding:30px 0 80px;}
@media(max-width:1080px){ .art-scrolly{grid-template-columns:1fr; gap:0;} }
.art-narrative{max-width:640px;}
.art-chapter{padding:14vh 0; border-bottom:var(--bw-hair) solid var(--rule-faint);}
.art-chapter:first-child{padding-top:4vh;}
.art-chapter:last-child{border-bottom:none;}
.art-chapter .stage-tag{font-family:var(--mono); font-size:.66rem; font-weight:600; letter-spacing:.14em; text-transform:uppercase; color:var(--accent-deep); margin-bottom:14px; display:flex; align-items:center; gap:11px;}
.art-chapter .stage-tag .n{display:inline-grid; place-items:center; width:24px; height:24px; border:var(--bw) solid var(--accent); border-radius:var(--r-xs); color:var(--accent-deep);}
.art-chapter h2{font-size:clamp(1.7rem,2.8vw,2.4rem); margin-bottom:18px;}
.art-chapter p{font-size:1.1rem; line-height:1.62; color:var(--ink-2); margin-bottom:18px; text-wrap:pretty;}
.art-chapter p:last-child{margin-bottom:0;}
.art-chapter .lead-fig{font-family:var(--mono); color:var(--ink); font-weight:500;}
.art-chapter .pull{border-left:var(--bw-heavy) solid var(--accent); padding:6px 0 6px 20px; margin:24px 0; font-family:var(--read); font-style:italic; font-size:1.2rem; color:var(--ink); line-height:1.45;}

.art-note{background:var(--bc-teal-025); border:var(--bw-hair) solid var(--bc-teal-100); border-radius:var(--r-md); padding:18px 20px; margin:24px 0;}
.art-note .nt{font-family:var(--mono); font-size:.62rem; letter-spacing:.12em; text-transform:uppercase; color:var(--accent-deep); margin-bottom:8px;}
.art-note p{font-size:.95rem; line-height:1.55; color:var(--ink-2); margin:0;}

/* ---------- stat callout (big removable-number box) ---------- */
.art-chapter .art-stat{background:var(--paper-2); border:var(--bw) solid var(--ink); border-radius:var(--r-md); padding:20px 22px; margin:26px 0;}
.art-stat .lbl{font-family:var(--mono); font-size:.6rem; letter-spacing:.13em; text-transform:uppercase; color:var(--signal); margin-bottom:9px;}
.art-stat .big{font-family:var(--mono); font-weight:600; font-size:2.1rem; line-height:1; letter-spacing:-.02em; color:var(--ink); margin-bottom:11px; font-variant-numeric:tabular-nums;}
.art-stat p{font-size:.92rem !important; line-height:1.52 !important; color:var(--ink-2); margin:0 !important;}

/* ---------- in-body subhead ---------- */
.art-chapter h3.art-sub{font-family:var(--read); font-weight:600; font-size:1.22rem; color:var(--ink); margin:26px 0 12px; letter-spacing:-.01em;}

/* ---------- inline citations ---------- */
sup.cite{font-family:var(--mono); font-size:.62em; font-weight:600; vertical-align:super; line-height:0;}
sup.cite a{color:var(--accent-deep); text-decoration:none; padding:0 1px;}
sup.cite a:hover{text-decoration:underline;}

/* ---------- references section ---------- */
.art-refs{border-top:var(--bw-hair) solid var(--rule-soft); background:var(--paper-2);}
.art-refs-inner{max-width:760px; margin:0 auto; padding:48px 36px;}
.art-refs h3{font-family:var(--mono); font-size:.7rem; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-soft); margin-bottom:22px;}
.art-refs-list{margin:0; padding:0; list-style:none; display:flex; flex-direction:column; gap:15px; counter-reset:none;}
.art-refs-list li{display:grid; grid-template-columns:30px 1fr; gap:12px; align-items:start;}
.art-refs-list li:target .rb{background:var(--bc-teal-025); border-radius:var(--r-xs);}
.art-refs-list .rn{font-family:var(--mono); font-size:.74rem; font-weight:600; color:var(--accent-deep); padding-top:2px; font-variant-numeric:tabular-nums;}
.art-refs-list .rb{font-size:.88rem; line-height:1.5; color:var(--ink-2); padding:2px 6px 2px 0;}
.art-refs-list .t{color:var(--ink); font-style:italic;}
.art-refs-list .pub{color:var(--ink-soft);}
.art-refs-list a{color:var(--accent-deep); word-break:break-word;}
.art-refs-note{margin:24px 0 0; font-family:var(--mono); font-size:.64rem; line-height:1.5; color:var(--dim); max-width:70ch;}
@media(max-width:680px){ .art-refs-inner{padding:34px 20px;} }

/* ---------- sticky panel base ---------- */
.art-dash-col{position:sticky; top:96px; align-self:start;}
@media(max-width:1080px){ .art-dash-col{position:sticky; top:65px; z-index:40; margin:0 -36px;} }
.art-dash{background:var(--card); border:var(--bw) solid var(--ink); border-radius:var(--r-lg); overflow:hidden; box-shadow:var(--sh-md);}
@media(max-width:1080px){ .art-dash{border-radius:0; border-left:none; border-right:none; box-shadow:var(--sh-sm);} }
.art-dash-top{display:flex; align-items:center; justify-content:space-between; gap:10px; padding:13px 18px; border-bottom:var(--bw) solid var(--ink); background:var(--ink); color:var(--paper);}
.art-dash-top .lbl{font-family:var(--mono); font-size:.62rem; letter-spacing:.14em; text-transform:uppercase; display:flex; align-items:center; gap:8px;}
.art-dash-top .lbl .live-dot{width:6px; height:6px; border-radius:50%; background:var(--bc-up-500); animation:bc-pulse 1.6s infinite;}
.art-dash-top .stage{font-family:var(--mono); font-size:.62rem; color:#c4bca9; letter-spacing:.06em; text-align:right;}
.art-dash-body{padding:18px;}

.art-hero-metric{margin-bottom:16px;}
.art-hero-metric .k{font-family:var(--mono); font-size:.62rem; letter-spacing:.13em; text-transform:uppercase; color:var(--ink-soft); margin-bottom:5px;}
.art-hero-metric .v{font-family:var(--mono); font-weight:600; font-size:2.8rem; line-height:1; letter-spacing:-.03em; color:var(--ink); font-variant-numeric:tabular-nums;}
.art-hero-metric .sub{font-family:var(--mono); font-size:.72rem; color:var(--ink-soft); margin-top:7px; display:flex; align-items:center; gap:7px;}
.delta{font-weight:600;} .delta.up{color:var(--up);} .delta.down{color:var(--signal);}

.art-mgrid{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--rule-soft); border:var(--bw-hair) solid var(--rule-soft); border-radius:var(--r-sm); overflow:hidden;}
.art-mgrid .m{background:var(--card); padding:12px 14px;}
.art-mgrid .m .k{font-family:var(--mono); font-size:.58rem; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-soft); margin-bottom:5px;}
.art-mgrid .m .v{font-family:var(--mono); font-weight:600; font-size:1.3rem; color:var(--ink); letter-spacing:-.01em; line-height:1; font-variant-numeric:tabular-nums;}

/* scrubber */
.art-scrub{border-top:var(--bw-hair) solid var(--rule-soft); padding:14px 18px; background:var(--paper-2);}
.art-scrub .track{position:relative; display:flex; justify-content:space-between; margin-bottom:11px;}
.art-scrub .track::before{content:""; position:absolute; top:6px; left:6px; right:6px; height:var(--bw); background:var(--rule);}
.art-scrub .track .prog{position:absolute; top:6px; left:6px; height:var(--bw); background:var(--accent); transition:width 600ms cubic-bezier(.4,0,.2,1);}
.art-scrub .pt{position:relative; z-index:2; width:13px; height:13px; border-radius:50%; background:var(--card); border:var(--bw) solid var(--rule); cursor:pointer; padding:0; transition:all var(--transition);}
.art-scrub .pt[aria-current="true"]{background:var(--accent); border-color:var(--accent-deep); transform:scale(1.18);}
.art-scrub .pt.done{background:var(--accent); border-color:var(--accent);}
.art-scrub .labels{display:flex; justify-content:space-between; font-family:var(--mono); font-size:.56rem; letter-spacing:.05em; text-transform:uppercase; color:var(--ink-soft);}
.art-scrub .labels span{flex:1; text-align:center;}
.art-scrub .labels span:first-child{text-align:left;}
.art-scrub .labels span:last-child{text-align:right;}
.art-scrub .labels span[aria-current="true"]{color:var(--accent-deep); font-weight:600;}
.art-hint{font-family:var(--mono); font-size:.6rem; color:var(--dim); text-align:center; padding:9px; letter-spacing:.06em; border-top:var(--bw-hair) solid var(--rule-soft);}
.art-hint .ar{display:inline-block; animation:art-bob 1.6s infinite;}
@keyframes art-bob{0%,100%{transform:translateY(0)}50%{transform:translateY(3px)}}

/* ---------- closing ---------- */
.art-close{border-top:var(--bw-heavy) solid var(--ink);}
.art-close-inner{max-width:760px; margin:0 auto; padding:56px 36px;}
.art-close .insight{background:var(--bc-teal-025); border:var(--bw) solid var(--bc-teal-100); border-radius:var(--r-md); padding:30px 32px; margin-bottom:22px;}
.art-close .insight .eyebrow{margin-bottom:8px; display:block;}
.art-close .insight .big{font-family:var(--mono); font-weight:600; font-size:2.7rem; color:var(--accent-deep); line-height:1; margin:6px 0 10px; letter-spacing:-.03em;}
.art-close .insight p{margin:0; color:var(--ink-2); max-width:54ch;}
.art-foot{border-top:var(--bw-hair) solid var(--rule-soft);}
.art-foot-inner{max-width:1280px; margin:0 auto; padding:26px 36px; display:flex; gap:18px; flex-wrap:wrap; justify-content:space-between; font-family:var(--mono); font-size:.7rem; color:var(--dim);}
@media(max-width:680px){ .art-close-inner{padding:40px 20px;} }

/* ============================================================
   RESEARCH INDEX
   ============================================================ */
.idx-hero{padding:64px 0 40px; border-bottom:var(--bw-heavy) solid var(--ink);}
.idx-hero .eyebrow{display:inline-block; margin-bottom:18px;}
.idx-hero h1{font-size:clamp(2.8rem,6vw,4.6rem); max-width:15ch; margin-bottom:22px;}
.idx-hero .lede{font-size:1.24rem; line-height:1.5; color:var(--ink-2); max-width:60ch;}
.idx-hero .stats{display:flex; gap:0; margin-top:34px; border-top:var(--bw) solid var(--ink);}
.idx-hero .st{flex:0 0 auto; padding:16px 30px 0 0; margin-right:30px; border-right:var(--bw-hair) solid var(--rule-soft);}
.idx-hero .st:last-child{border-right:none;}
.idx-hero .st .n{font-family:var(--mono); font-size:1.7rem; font-weight:600; color:var(--ink); letter-spacing:-.02em; white-space:nowrap;}
.idx-hero .st .l{font-family:var(--mono); font-size:.62rem; letter-spacing:.12em; text-transform:uppercase; color:var(--ink-soft); margin-top:4px;}

.idx-sec-lab{font-family:var(--mono); font-size:.66rem; font-weight:600; letter-spacing:.14em; text-transform:uppercase; color:var(--accent-deep); display:flex; align-items:center; gap:14px; margin:46px 0 24px;}
.idx-sec-lab::after{content:""; flex:1; height:1px; background:var(--rule-soft);}

/* featured (interactive) */
.idx-feat{display:grid; grid-template-columns:repeat(2,1fr); gap:20px; margin-bottom:20px;}
@media(max-width:880px){ .idx-feat{grid-template-columns:1fr;} }
.idx-card{display:flex; flex-direction:column; border:var(--bw) solid var(--ink); border-radius:var(--r-md); overflow:hidden; background:var(--card); text-decoration:none; color:var(--ink); transition:transform var(--transition), box-shadow var(--transition);}
.idx-card:hover{transform:translateY(-3px); box-shadow:var(--sh-md);}
.idx-card .viz{height:150px; border-bottom:var(--bw) solid var(--ink); position:relative; overflow:hidden; background:var(--paper-2);}
.idx-card .badge{position:absolute; top:12px; left:12px; z-index:3; display:inline-flex; align-items:center; gap:6px; font-family:var(--mono); font-size:.6rem; font-weight:600; letter-spacing:.08em; text-transform:uppercase; padding:5px 9px; border-radius:var(--r-xs); background:var(--ink); color:var(--paper);}
.idx-card .badge .d{width:5px; height:5px; border-radius:50%; background:var(--bc-up-500); animation:bc-pulse 1.6s infinite;}
.idx-card .body{padding:20px 22px 22px; display:flex; flex-direction:column; flex:1;}
.idx-card .meta{font-family:var(--mono); font-size:.64rem; letter-spacing:.06em; color:var(--ink-soft); margin-bottom:10px;}
.idx-card h3{font-family:var(--read); font-weight:600; font-size:1.34rem; line-height:1.18; margin-bottom:9px; letter-spacing:-.01em;}
.idx-card p{font-size:.96rem; color:var(--ink-2); margin:0 0 16px; line-height:1.5;}
.idx-card .go{margin-top:auto; font-family:var(--mono); font-size:.72rem; color:var(--accent-deep); display:inline-flex; align-items:center; gap:7px;}
.idx-card:hover .go{gap:11px;}

/* standard list */
.idx-list{border-top:var(--bw) solid var(--ink);}
.idx-row{display:grid; grid-template-columns:128px 1fr auto; gap:22px; align-items:center; padding:20px 4px; border-bottom:var(--bw-hair) solid var(--rule-soft); text-decoration:none; color:var(--ink); transition:background var(--transition);}
.idx-row:hover{background:var(--paper-2);}
.idx-row .cat{font-family:var(--mono); font-size:.64rem; letter-spacing:.06em; color:var(--ink-soft);}
.idx-row h3{font-family:var(--read); font-weight:600; font-size:1.18rem; margin:0 0 4px;}
.idx-row p{font-size:.92rem; color:var(--ink-soft); margin:0; line-height:1.45;}
.idx-row .arr{color:var(--rule); transition:all var(--transition);}
.idx-row:hover h3{color:var(--accent-deep);}
.idx-row:hover .arr{color:var(--accent); transform:translateX(4px);}
@media(max-width:680px){ .idx-row{grid-template-columns:1fr; gap:6px;} .idx-row .arr{display:none;} }

/* mini-viz primitives used in index cards */
.mv-bars{position:absolute; inset:0; display:flex; align-items:flex-end; gap:7px; padding:18px 16px;}
.mv-bars i{flex:1; background:var(--bc-ink-200); border-radius:2px 2px 0 0;}
.mv-bars i.a{background:var(--accent);}
.mv-lines{position:absolute; inset:0;}
.mv-receipt{position:absolute; inset:0; padding:16px 18px; font-family:var(--mono); font-size:.62rem; color:var(--ink-soft); display:flex; flex-direction:column; gap:6px;}
.mv-receipt .li{display:flex; justify-content:space-between; border-bottom:1px dashed var(--rule-soft); padding-bottom:4px;}
.mv-receipt .li b{color:var(--ink);}
.mv-receipt .tot{margin-top:auto; display:flex; justify-content:space-between; font-size:.8rem; color:var(--ink); font-weight:600;}

/* donut mini-viz (donutShift) */
.mv-donut{position:absolute; inset:0; display:grid; place-items:center;}
.mv-donut .ring{width:96px; height:96px; border-radius:50%;
  background:conic-gradient(var(--bc-teal-500) 0 30%, var(--bc-teal-400) 30% 44%, var(--bc-ink-300) 44% 56%, var(--bc-warn-500) 56% 69%, var(--signal) 69% 100%);
  -webkit-mask:radial-gradient(circle, transparent 0 30px, #000 31px); mask:radial-gradient(circle, transparent 0 30px, #000 31px);}

/* bubble mini-viz (bubbleQuadrant) */
.mv-bubbles{position:absolute; inset:0;}
.mv-bubbles::before,.mv-bubbles::after{content:""; position:absolute; background:var(--rule-soft);}
.mv-bubbles::before{left:50%; top:14px; bottom:14px; width:1px; border-left:1px dashed var(--rule-soft); background:none;}
.mv-bubbles::after{top:50%; left:16px; right:16px; height:1px; border-top:1px dashed var(--rule-soft); background:none;}
.mv-bubbles i{position:absolute; border-radius:50%; transform:translate(-50%,-50%);}

/* ---------- scroll-reveal entrance animations ---------- */
.sc-reveal{opacity:0; transform:translateY(20px); transition:opacity .62s cubic-bezier(.4,0,.2,1), transform .62s cubic-bezier(.4,0,.2,1); will-change:opacity,transform;}
.sc-reveal.sc-in{opacity:1; transform:none;}
@media (prefers-reduced-motion: reduce){ .sc-reveal{opacity:1 !important; transform:none !important; transition:none !important;} }