/* /how-it-works/ — page-only pieces on top of the shared solution template (component guide: solution.css lines 1–75).
   Hero ledger card · §1 fact cards · §2 backbone flow figure (inline SVG, ≥900px) + the same content as an ordered list ·
   §3 component cards, operating principles, evidence mock, dMRV chain · §4 service tabs + RACI tables · §5–7 tables with
   status chips · reading list. Colours come from main.css tokens only; rgba() values are those tokens with alpha
   (night 10,42,30 · on-night 234,242,236 · signal 191,234,98). --signal appears only on night surfaces.
   Motion: how.js arms the flow figure (adds .is-armed) and plays it once (.is-on, under 3 s). Without JS, or with
   prefers-reduced-motion, the figure is static in its final state. */

.sol-how .sol-sec.dark > .wrap{position:relative}
.sol-how .side-lead{margin-top:16px}
.sol-how .side-link{margin-top:22px}

/* ---------- Hero: one ledger, three services ---------- */
.sol-how .sol-hero h1{max-width:19em}
.lg .mk-row{padding:11px 0}
.lg .mk-row b{display:block;font-weight:600;font-size:13.5px;line-height:1.45}
.lg-tag{display:inline-flex;align-items:center;margin-bottom:6px;padding:3px 6px;font:500 11px/1 var(--font-mono);color:var(--signal);border:1px solid rgba(191,234,98,.45);border-radius:var(--r-xs);word-spacing:-.2em}
.lg-foot .mk-chips{margin-top:8px}

/* ---------- §1 Fact cards ---------- */
.facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--gap)}
.fact{position:relative;display:flex;flex-direction:column;gap:12px;min-width:0;padding:clamp(22px,2.4vw,32px);background:var(--card);border:1px solid var(--rule);border-radius:var(--r-m)}
.fact::before{content:"";position:absolute;left:-1px;top:-1px;width:16px;height:16px;border-left:2px solid var(--brand);border-top:2px solid var(--brand);border-top-left-radius:var(--r-m)}
.fact__k{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;font:500 12px/1.4 var(--font-mono);color:var(--forest);word-spacing:-.25em}
.fact__k .st{word-spacing:normal}
.fact__v{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;margin-top:4px;font:640 clamp(40px,4.2vw,62px)/1 var(--font-sans);letter-spacing:-.045em;font-variant-numeric:lining-nums tabular-nums;color:var(--ink)}
.fact__v small{font:500 15px/1.3 var(--font-sans);letter-spacing:-.01em;color:var(--ink-2)}
.fact__v--date{font-size:clamp(34px,3.3vw,48px);letter-spacing:-.03em}
.fact h3{font-size:clamp(17px,1.35vw,19.5px);line-height:1.5;letter-spacing:-.012em}
.fact__d{font-size:15px;line-height:1.7;color:var(--ink-2)}
.fact .src-line{margin-top:auto;padding-top:14px;border-top:1px solid var(--rule)}
.why-close{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:14px 32px;margin-top:clamp(36px,4vw,56px);padding-top:clamp(20px,2.4vw,28px);border-top:1.5px solid var(--ink)}
.why-close p{font-size:clamp(22px,2.2vw,32px);line-height:1.35;font-weight:650;letter-spacing:-.025em;max-width:26em;text-wrap:balance}
@media (max-width:980px){.facts{grid-template-columns:minmax(0,1fr)}}

/* ---------- §2 Backbone flow figure (dark band) ---------- */
.how-flow{margin:0;padding:clamp(18px,2.6vw,36px);border:1px solid rgba(234,242,236,.16);border-radius:var(--r-m);background:rgba(10,42,30,.72)}
.how-flow__svg{display:block;width:100%;height:auto;overflow:visible}
.how-flow__svg text{font-family:var(--font-sans)}
.how-flow__svg .fl-col,.how-flow__svg .fl-idx,.how-flow__svg .fl-rec,.how-flow__svg .fl-note{font-family:var(--font-mono)}
.fl-col{font-size:13px;font-weight:500;letter-spacing:.06em;fill:var(--on-night-2)}
.fl-box{fill:rgba(234,242,236,.04);stroke:rgba(234,242,236,.3);stroke-width:1.2}
.fl-lab{font-size:17px;font-weight:600;fill:var(--on-night)}
.fl-lab--o{font-size:16px}
.fl-osub{font-size:13.5px;fill:var(--on-night-2)}
.fl-frame{fill:rgba(191,234,98,.05);stroke:var(--signal);stroke-opacity:.55;stroke-width:1.5}
.fl-nodes rect{fill:var(--signal)}
.fl-part rect{fill:var(--night-2);stroke:rgba(234,242,236,.22);stroke-width:1}
.fl-idx{font-size:13px;font-weight:500;fill:var(--signal)}
.fl-title{font-size:18px;font-weight:650;fill:var(--on-night)}
.fl-sub{font-size:14px;fill:var(--on-night)}
.fl-rec{font-size:12.5px;fill:var(--on-night-2)}
.fl-wire{fill:none;stroke:rgba(234,242,236,.42);stroke-width:1.5}
.fl-wire--out{stroke:var(--signal);stroke-opacity:.75}
.fl-note{font-size:12.5px;fill:var(--on-night-2)}
.how-flow__cap{margin-top:clamp(14px,1.6vw,20px);padding-top:14px;border-top:1px solid rgba(234,242,236,.12);font-size:14px;line-height:1.65;color:var(--on-night-2)}
.how-flow__cap .mono-k{margin-right:8px;color:var(--signal)}
/* one-shot draw: armed by how.js only when motion is allowed; .is-on plays it (wires → parts → outputs, ≈2.8 s) */
.how-flow.is-armed .fl-wire{stroke-dasharray:1 1;stroke-dashoffset:1}
.how-flow.is-armed :is(.fl-part,.fl-out){opacity:.3}
.how-flow.is-armed.is-on .fl-wire{stroke-dashoffset:0;transition:stroke-dashoffset 1s var(--ease-out) var(--d,0s)}
.how-flow.is-armed.is-on :is(.fl-part,.fl-out){opacity:1;transition:opacity .6s var(--ease-out) var(--d,0s)}
/* the same content as an ordered list: legend under the figure (≥900px), the diagram itself on small screens */
.flow-list{list-style:none;margin:clamp(22px,2.6vw,34px) 0 0;padding:0;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr) minmax(0,1fr);gap:var(--gap)}
.flow-list > li{min-width:0;padding-top:16px;border-top:1px solid rgba(234,242,236,.2)}
.flow-list__k{font:500 12px/1.2 var(--font-mono);color:var(--signal);word-spacing:-.25em}
.flow-list__h{margin-top:10px;font-size:17px;font-weight:650;line-height:1.45;color:var(--on-night)}
.flow-list ul{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:10px}
.flow-list ul li{position:relative;padding-left:18px;font-size:14.5px;line-height:1.6;color:var(--on-night-2)}
.flow-list ul li::before{content:"";position:absolute;left:1px;top:8px;width:6px;height:6px;border:1.5px solid var(--signal);transform:rotate(45deg)}
.flow-list ul b{display:block;color:var(--on-night);font-weight:600}
@media (max-width:899px){
  .how-flow{display:none}
  .flow-list{grid-template-columns:minmax(0,1fr);gap:0;margin-top:0}
  .flow-list > li{position:relative;padding:18px 18px 20px;border:1px solid rgba(234,242,236,.18);border-radius:var(--r-m);background:rgba(10,42,30,.72)}
  .flow-list > li:nth-child(2){border-color:rgba(191,234,98,.55)}
  .flow-list > li + li{margin-top:34px}
  .flow-list > li + li::before{content:"";position:absolute;left:28px;top:-29px;width:1.5px;height:20px;background:var(--signal)}
  .flow-list > li + li::after{content:"";position:absolute;left:24px;top:-13px;border:5px solid transparent;border-top:6px solid var(--signal);border-bottom:0}
}

/* ---------- §3 Components, principles, evidence mock, dMRV chain ---------- */
.comp .deliv__dl .st{margin-left:6px;vertical-align:1px}
.comp-more{align-items:center}
.rule-status{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;margin-top:12px;font-size:13.5px;line-height:1.5;color:var(--ink-2)}
.callout--note .rule-status + ul{margin-top:14px}
.evid-fig{margin:0;min-width:0}
.evid-fig figcaption{margin-top:14px;font-size:14.5px;line-height:1.65;color:var(--ink-2)}
.evid-fig figcaption b{color:var(--ink);font-weight:650}
.sol-how .doc{position:relative;display:grid;gap:8px;padding:16px 16px 18px;border-radius:4px;background:var(--paper);color:var(--ink);font-size:12.5px;line-height:1.6}
.sol-how .doc__wm{justify-self:start;padding:4px 6px;font:600 11px/1 var(--font-mono);color:var(--ink-2);background:var(--card);border:1px dashed var(--ink-2);border-radius:2px;word-spacing:-.2em}
.sol-how .doc__h{font-weight:700;font-size:13px}
.sol-how .doc__p{font-size:13px;line-height:1.75}
.sol-how .doc__p mark{padding:1px 4px;color:inherit;background:var(--mist);border-radius:2px;outline:1.5px solid var(--forest);outline-offset:0}
.sol-how .doc .ex{color:var(--ink-2)}
.sol-how .doc__l{height:7px;border-radius:2px;background:var(--rule)}
.sol-how .doc__l.short{width:62%}
.sol-how .pop{position:relative;margin:6px 0 4px 16%;padding:11px 13px;font:400 11.5px/1.75 var(--font-mono);color:var(--on-night);background:var(--night);border:1px solid rgba(191,234,98,.5);border-radius:5px;box-shadow:0 14px 30px -12px rgba(10,42,30,.6);word-spacing:-.2em}
.sol-how .pop::before{content:"";position:absolute;left:24px;top:-7px;width:12px;height:12px;background:var(--night);border-left:1px solid rgba(191,234,98,.5);border-top:1px solid rgba(191,234,98,.5);transform:rotate(45deg)}
.sol-how .pop b{margin-right:8px;font-weight:500;color:var(--signal)}
.chain-head{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:10px clamp(24px,5vw,80px);align-items:end;margin-bottom:clamp(20px,2.4vw,30px)}
.chain-head p{font-size:15.5px;line-height:1.7;color:var(--ink-2);max-width:40em}
.chain{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:22px 0}
.chain li{position:relative;display:flex;flex-direction:column;gap:6px;min-width:0;padding:20px 16px 0 0;border-top:1.5px solid var(--ink)}
.chain li::before{content:"";position:absolute;left:0;top:-5.5px;width:9px;height:9px;background:var(--ink);border:1.5px solid var(--ink)}
.chain li.is-x{border-top-style:dashed;border-top-color:var(--ink-2)}
.chain li.is-x::before{background:var(--paper);border-color:var(--ink-2)}
.chain__n{font:500 12px/1 var(--font-mono);color:var(--forest)}
.chain b{font-size:16.5px;font-weight:650;line-height:1.35;letter-spacing:-.01em}
.chain__d{font-size:14px;line-height:1.55;color:var(--ink-2)}
.chain__who{align-self:flex-start;margin-top:6px;padding:5px 8px;font:500 12px/1 var(--font-mono);color:var(--ink);background:var(--card);border:1px solid var(--rule-2);border-radius:var(--r-xs);word-spacing:-.2em}
.chain li.is-x .chain__who{border-style:dashed;color:var(--ink-2)}
@media (max-width:1100px){.chain{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:900px){.chain-head{grid-template-columns:minmax(0,1fr)}}
@media (max-width:560px){.chain{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* ---------- §4 Service tabs (how.js) + RACI tables ---------- */
.flows__tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin-bottom:clamp(22px,2.6vw,32px);padding:6px;background:var(--card);border:1px solid var(--rule);border-radius:var(--r-m)}
.flows__tab{display:flex;flex-direction:column;align-items:flex-start;justify-content:center;gap:6px;min-width:0;min-height:64px;padding:12px 16px;font:600 16px/1.3 var(--font-sans);text-align:left;color:var(--ink-2);background:transparent;border:1px solid transparent;border-radius:var(--r-s);cursor:pointer;transition:background-color .2s,color .2s}
.flows__tab small{font:500 12px/1.3 var(--font-mono);color:var(--ink-2);word-spacing:-.25em}
.flows__tab:hover{color:var(--ink);background:var(--paper)}
.flows__tab[aria-selected="true"]{color:var(--card);background:var(--brand)}
.flows__tab[aria-selected="true"] small{color:var(--signal)}
.flows__tab:focus-visible{outline:2px solid var(--forest);outline-offset:2px}
.flow-panel + .flow-panel{margin-top:clamp(48px,6vw,80px)}
.flows.is-tabbed .flow-panel + .flow-panel{margin-top:0}
.flow-panel:focus-visible{outline:2px solid var(--forest);outline-offset:8px;border-radius:var(--r-s)}
.flow-panel__head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px 28px;align-items:end;margin-bottom:18px}
.flow-panel__head h3{font-size:clamp(21px,1.9vw,28px);line-height:1.3;letter-spacing:-.022em}
.flow-panel__head p{margin-top:8px;font-size:15.5px;line-height:1.7;color:var(--ink-2);max-width:44em}
.flow-panel__head .text-link{font-size:15px;white-space:nowrap}
.flow-note{margin-top:12px;font-size:14px;line-height:1.65;color:var(--ink-2)}
.raci thead th.is-g{color:var(--brand)}
.raci td.is-g{background:var(--paper)}
.raci :is(td,th).is-x{border-left:1.5px dashed var(--rule-2)}
.raci__n{display:block;margin-bottom:3px;font:500 12px/1.2 var(--font-mono);color:var(--forest)}
.raci thead th:nth-child(1){width:17%}.raci thead th:nth-child(2){width:21%}.raci thead th:nth-child(3){width:28%}
.raci .na{color:var(--ink-3)}
@media (max-width:760px){
  .flow-panel__head{grid-template-columns:minmax(0,1fr)}
  .flow-panel__head .text-link{justify-self:start;white-space:normal}
}
@media (max-width:560px){
  .flows__tabs{grid-template-columns:minmax(0,1fr);gap:4px;padding:4px}
  .flows__tab{flex-direction:row;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:2px 12px;min-height:48px;padding:10px 14px;font-size:15px}
}

/* ---------- §5–7 tables ---------- */
.dtable tbody th small{display:block;margin-top:4px;font:400 12px/1.4 var(--font-mono);font-weight:400;color:var(--ink-2);word-spacing:-.2em}
.st-note{display:block;margin-top:6px;font:400 12px/1.4 var(--font-mono);color:var(--ink-2);word-spacing:-.2em}
.meas-note{margin-top:clamp(20px,2.4vw,28px)}
.meas-note p + p{margin-top:8px}
.mrv-cmp{align-items:center}
.mrv-cmp__lead{margin-top:14px;font-size:15.5px;line-height:1.75;color:var(--ink-2);max-width:36em}
.mrv-t td:last-child{font-weight:600}
.loc-lead{margin:8px 0 18px;font-size:15.5px;color:var(--ink-2)}
.loc-t .grp th{font:500 12px/1.4 var(--font-mono);color:var(--forest);background:var(--paper);word-spacing:-.25em}
.sec-foot{margin-bottom:0}
@media (max-width:760px){
  .table-wrap--stack .grp{margin:20px 0 8px;border:0;background:none}
  .table-wrap--stack .grp th{padding:0 2px;background:none}
}

/* ---------- §8 Standards strip ---------- */
.how-std{padding-bottom:clamp(40px,5vw,72px);border-bottom:0}

/* ---------- Reading list ---------- */
.soon-title{margin-top:clamp(28px,3vw,40px);font:500 12px/1 var(--font-mono);color:var(--ink-2);word-spacing:-.25em}
.soon{list-style:none;margin:14px 0 0;padding:0;border-top:1px solid var(--rule)}
.soon li{display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 14px;align-items:baseline;padding:14px 0;border-bottom:1px solid var(--rule)}
.soon__tag{font:500 12px/1 var(--font-mono);padding:5px 7px;color:var(--ink-2);border:1px dashed var(--ink-2);border-radius:var(--r-xs);white-space:nowrap;word-spacing:-.25em}
.soon b{font-size:15.5px;font-weight:600;line-height:1.5}
.soon small{grid-column:2;font:400 12px/1.4 var(--font-mono);color:var(--ink-2)}
@media (max-width:480px){.soon li{grid-template-columns:minmax(0,1fr)}.soon__tag{justify-self:start}.soon small{grid-column:1}}

/* ---------- Reduced motion / print: final state ---------- */
@media (prefers-reduced-motion:reduce){
  .how-flow .fl-wire{stroke-dasharray:none!important;stroke-dashoffset:0!important}
  .how-flow :is(.fl-part,.fl-out){opacity:1!important}
  .flows__tab{transition:none}
}
@media print{
  .how-flow .fl-wire{stroke-dasharray:none!important;stroke-dashoffset:0!important}
  .how-flow :is(.fl-part,.fl-out){opacity:1!important}
}