/* Layout: a single left-aligned column on a 12-col grid, like an engineer's
   performance report. Sections are "label | content" rows; the data section is
   the centrepiece: what goes in, what RAP configures, what comes out. */
:root {
  color-scheme: light;
  --paper: #f5f7f4;
  --panel: #ffffff;
  --ink: #12211a;
  --ink-2: #47564e;
  --ink-3: #5d6a63;
  --rule: #d6ddd7;
  --green: #136b33;
  --green-soft: #e3efe6;
  --pt: #7a877f;
  --s-under: #2a78d6;
  --s-curt: #d4561f;
  /* technology colours, the same everywhere (fleet map, Technologies, work cards, hero tabs).
     Validated as a categorical set (colour-blind separation, >= 3:1 on paper). Marks and
     borders only: wind and solar are below 4.5:1, so never use them for text. */
  --c-wind: #2a78d6;
  --c-solar: #d4561f;
  --c-storage: #a33f9e;
  /* dark band behind "Why it matters" */
  --band: #0f3d22;
  --band-ink: #ffffff;
  --band-ink-2: #c9dccf;
  --band-accent: #8fd3a5;
  --on-green: #ffffff;

  --display: "Archivo", "Arial Narrow", Arial, sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --wrap: 72rem;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 1.0625rem/1.6 var(--body); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration-color: var(--green); text-underline-offset: 0.2em; }
a:hover { color: var(--green); }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }
p, figure, h1, h2, h3 { margin: 0; }
.wrap { max-width: var(--wrap); margin-inline: auto; padding-left: max(20px, env(safe-area-inset-left, 0px)); padding-right: max(20px, env(safe-area-inset-right, 0px)); }
.mono { font: 400 0.8125rem/1.5 var(--mono); letter-spacing: 0.01em; color: var(--ink-2); }
.label { font: 500 0.75rem/1.4 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; color: var(--green); }
h1, h2, h3 { font-family: var(--display); font-stretch: 112%; text-wrap: balance; }
h1 { font-weight: 650; font-size: clamp(2.1rem, 4vw, 3.1rem); line-height: 1.05; letter-spacing: -0.02em; }
h2 { font-weight: 600; font-size: clamp(1.6rem, 2.6vw, 2.1rem); line-height: 1.15; letter-spacing: -0.012em; }
h3 { font-weight: 600; font-size: 1.125rem; line-height: 1.3; font-stretch: 105%; }

/* header (homepage and article pages) */
.top { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding-block: 1.25rem; flex-wrap: wrap; }
.top .logo img { height: 44px; width: auto; }
.top nav { display: flex; gap: 1.5rem; flex-wrap: wrap; font-size: 0.9375rem; }
.top nav a { text-decoration: none; color: var(--ink-2); }
.top nav a:hover { color: var(--ink); }
.top nav a.cta { color: var(--ink); font-weight: 600; border-bottom: 2px solid var(--green); }

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: center; padding-block: clamp(2rem, 5vw, 4rem) clamp(3rem, 6vw, 5rem); }
.hero-copy { display: grid; gap: 1.5rem; }
.hero-aside { font-size: 0.9375rem; display: flex; flex-wrap: wrap; gap: 0.3rem 0.8rem; align-items: baseline; }
.hero-aside .mono { font-size: 0.75rem; }
.hero-copy .lede { font-size: 1.1875rem; color: var(--ink-2); max-width: 34rem; }
.asked { border-left: 2px solid var(--green); padding: 0.15rem 0 0.15rem 1rem; display: grid; gap: 0.3rem; }
.asked .q { font: italic 500 1.125rem/1.4 var(--display); font-stretch: 100%; min-height: 2.8em; }
.cur { display: inline-block; width: 2px; height: 1em; background: var(--green); margin-left: 3px; vertical-align: -0.12em; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.actions { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; }
.btn { display: inline-block; background: var(--ink); color: var(--paper); font-weight: 600; font-size: 0.9375rem; padding: 0.8rem 1.25rem; border-radius: 3px; text-decoration: none; }
.btn:hover { background: var(--green); color: var(--paper); }
.fig { background: var(--panel); border: 1px solid var(--rule); border-radius: 4px; padding: 1.25rem 1.25rem 1rem; position: relative; min-width: 0; }
.fig-head { display: flex; justify-content: space-between; gap: 0.5rem 1rem; flex-wrap: wrap; align-items: baseline; margin-bottom: 0.5rem; }
.fig-head strong { font: 600 0.9375rem/1.3 var(--display); }
.legend { display: flex; gap: 1rem; flex-wrap: wrap; font: 400 0.75rem/1.4 var(--mono); color: var(--ink-2); }
.legend span::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 0.4em; background: var(--k); }
.legend .line::before { width: 14px; height: 2px; border-radius: 0; vertical-align: middle; }
#pc { width: 100%; height: auto; display: block; touch-action: pan-y; }
#pc text { font: 400 11px var(--mono); fill: var(--ink-3); }
#pc .ann { fill: var(--ink); font-weight: 500; }
.tip { position: absolute; pointer-events: none; background: var(--ink); color: var(--paper); font: 400 0.75rem/1.45 var(--mono); padding: 0.4rem 0.6rem; border-radius: 3px; white-space: nowrap; transform: translate(-50%, calc(-100% - 10px)); }
.fig figcaption { margin-top: 0.5rem; }

/* sections */
section { border-top: 1px solid var(--rule); }
.sec { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: 2rem clamp(2rem, 5vw, 4.5rem); padding-block: clamp(3rem, 6vw, 5rem); }
.sec-head { display: grid; gap: 0.75rem; align-content: start; }
.sec-head p:not(.label) { color: var(--ink-2); font-size: 1rem; }
.sec-body { min-width: 0; }

/* problems -> work */
.asks { display: grid; }
.ask { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 0.75rem 2.5rem; padding-block: 1.75rem; border-top: 1px solid var(--rule); }
.ask:first-child { border-top: 0; padding-top: 0; }
.ask:last-child { padding-bottom: 0; }
.ask q { font: 500 1.3125rem/1.3 var(--display); font-stretch: 105%; quotes: "\201C" "\201D"; display: block; text-wrap: balance; }
.ask .what { display: grid; gap: 0.5rem; align-content: start; }
.ask .what p { color: var(--ink-2); font-size: 1rem; }

/* data flow */
.flow { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1.1fr) auto minmax(0, 1fr); gap: 1rem; align-items: stretch; }
.flow .col { background: var(--panel); border: 1px solid var(--rule); border-radius: 4px; padding: 1.25rem; display: grid; gap: 0.9rem; align-content: start; }
.flow .col.mid { background: var(--green-soft); border-color: transparent; }
.flow .col h3 { font-size: 1rem; }
.flow ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }
.flow li { font-size: 0.9375rem; line-height: 1.4; }
.flow li small { display: block; font: 400 0.75rem/1.45 var(--mono); color: var(--ink-2); }
.flow .sub { padding-top: 0.9rem; border-top: 1px solid var(--rule); }
.flow .arrow { align-self: center; font: 400 1.25rem var(--mono); color: var(--ink-3); }
.note { margin-top: 1.5rem; color: var(--ink-2); max-width: 46rem; font-size: 1rem; }
.cred { display: inline-flex; align-items: center; gap: 0.6rem; font: 500 0.8125rem/1.3 var(--mono); border: 1px solid var(--rule); background: var(--panel); border-radius: 4px; padding: 0.5rem 0.75rem; margin-top: 1rem; text-decoration: none; }
.cred::before { content: ""; width: 8px; height: 8px; background: var(--green); border-radius: 50%; }

/* three questions */
.three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; }
.three div { display: grid; gap: 0.6rem; align-content: start; border-top: 2px solid var(--ink); padding-top: 0.9rem; }
.three p { color: var(--ink-2); font-size: 0.9375rem; }
.three .lineq { font: italic 500 1.0625rem/1.35 var(--display); font-stretch: 100%; color: var(--ink); }
/* dark band: a full-width chapter break */
.band { background: var(--band); color: var(--band-ink); border-top: 0; }
.band + section { border-top: 0; }
.band .label { color: var(--band-accent); }
.band h2, .band .three .lineq { color: var(--band-ink); }
.band .sec-head p:not(.label), .band .three p:not(.lineq) { color: var(--band-ink-2); }
.band .three div { border-top-color: var(--band-accent); }

/* steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.5rem; counter-reset: s; }
.steps li { counter-increment: s; display: grid; gap: 0.5rem; align-content: start; border-top: 2px solid var(--ink); padding-top: 0.9rem; }
.steps li::before { content: "0" counter(s); font: 500 0.75rem var(--mono); color: var(--green); letter-spacing: 0.09em; }
.steps p { color: var(--ink-2); font-size: 0.9375rem; }

/* team */
.team { display: grid; gap: 3rem; }
.person { display: grid; grid-template-columns: 88px minmax(0, 1fr); gap: 0.9rem 1.5rem; align-items: start; }
.person img { width: 88px; height: 88px; border-radius: 50%; object-fit: cover; filter: grayscale(1); }
.person .txt { display: grid; gap: 0.8rem; }
.person .txt > p:not(.mono) { color: var(--ink-2); font-size: 1rem; max-width: 44rem; }

/* notes */
.notes { list-style: none; margin: 0; padding: 0; }
.notes li { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: 0.25rem 1.5rem; padding-block: 1.1rem; border-top: 1px solid var(--rule); }
.notes li:first-child { border-top: 0; padding-top: 0; }
.notes a { font: 600 1.125rem/1.3 var(--display); text-decoration: none; }
.notes a:hover { text-decoration: underline; }
.notes p { grid-column: 2; color: var(--ink-2); font-size: 0.9375rem; }

/* contact + footer */
.contact { display: grid; gap: 1.25rem; }
.contact .big { font: 600 clamp(1.4rem, 3vw, 2rem)/1.2 var(--display); user-select: all; overflow-wrap: anywhere; }
.contact dl { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0.4rem 1.5rem; margin: 0; font-size: 1rem; }
.contact dt { font: 400 0.8125rem/1.9 var(--mono); color: var(--ink-3); }
.contact dd { margin: 0; }
footer.site, .foot { border-top: 1px solid var(--rule); }
footer.site .wrap, .foot .wrap { padding-block: 1.5rem 2.5rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; font: 400 0.8125rem/1.5 var(--mono); color: var(--ink-2); }

/* article pages */
.article { max-width: 44rem; padding-block: clamp(2.5rem, 6vw, 4.5rem); display: grid; gap: 1.25rem; }
.article h1 { font-size: clamp(2rem, 4.2vw, 2.8rem); line-height: 1.1; }
.signoff { display: flex; gap: 0.9rem; align-items: center; margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); }
.signoff img { width: 48px; height: 48px; border-radius: 50%; object-fit: cover; filter: grayscale(1); flex: none; }
.signoff p { font-size: 0.9375rem; }
.article .standfirst { font-size: 1.25rem; line-height: 1.5; color: var(--ink-2); }
.article h2 { font-size: 1.5rem; margin-top: 1.25rem; }
.article p, .article li { color: var(--ink-2); }
.article ul { margin: 0; padding-left: 1.2rem; display: grid; gap: 0.5rem; }
.article strong { color: var(--ink); }
.article table { border-collapse: collapse; width: 100%; font-size: 0.9375rem; }
.article th, .article td { text-align: left; vertical-align: top; padding: 0.6rem 0.9rem 0.6rem 0; border-top: 1px solid var(--rule); color: var(--ink-2); }
.article th { font: 500 0.75rem/1.4 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--green); border-top: 0; }
.article td:first-child { color: var(--ink); font-weight: 600; }
.article .btn { color: var(--paper); }
.tablewrap { overflow-x: auto; }
.back { font: 400 0.8125rem/1.5 var(--mono); color: var(--ink-3); }

@media (max-width: 860px) {
  .hero, .sec, .ask { grid-template-columns: minmax(0, 1fr); }
  .flow, .three { grid-template-columns: minmax(0, 1fr); }
  .flow .arrow { justify-self: center; transform: rotate(90deg); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 460px) {
  .steps, .notes li { grid-template-columns: minmax(0, 1fr); }
  .notes p { grid-column: 1; }
  .person { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) { .cur { animation: none; } }

/* recent work + delivery rules */
.cases { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.case { background: var(--panel); border: 1px solid var(--rule); border-radius: 4px; padding: 1.25rem; display: grid; gap: 0.7rem; align-content: start; }
.case p:not(.mono):not(.tags) { color: var(--ink-2); font-size: 0.9375rem; line-height: 1.5; }
.case .tags { font: 400 0.75rem/1.5 var(--mono); color: var(--green); margin-top: 0.2rem; }
.tech { white-space: nowrap; }
.tech::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--k); margin-right: 0.35em; vertical-align: 0.05em; }
.rules { list-style: none; margin: 1.5rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.6rem 2.5rem; }
.rules li { font-size: 0.9375rem; color: var(--ink-2); padding-top: 0.6rem; border-top: 1px solid var(--rule); }
.rules strong { color: var(--ink); font-weight: 600; }
@media (max-width: 1000px) { .cases { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 600px) { .rules { grid-template-columns: minmax(0, 1fr); } }

/* technology tabs + technologies section */
.tabs { display: flex; gap: 0.25rem; margin-bottom: 0.9rem; border-bottom: 1px solid var(--rule); flex-wrap: wrap; }
.tabs button { font: 500 0.875rem/1 var(--body); color: var(--ink-2); background: none; border: 0; border-bottom: 2px solid transparent; padding: 0.55rem 0.7rem 0.6rem; margin-bottom: -1px; cursor: pointer; }
.tabs button:hover { color: var(--ink); }
.tabs button[aria-selected="true"], .tabs button[aria-pressed="true"] { color: var(--ink); border-bottom-color: var(--k, var(--green)); }
#tab-wind { --k: var(--c-wind); } #tab-solar { --k: var(--c-solar); } #tab-bess { --k: var(--c-storage); }
#fig .tabs button::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--k); margin-right: 0.45em; vertical-align: 0.05em; }
.legend .dash::before { background: repeating-linear-gradient(90deg, var(--k) 0 4px, transparent 4px 7px); }
.techs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; }
.techs > div { display: grid; gap: 0.6rem; align-content: start; border-top: 3px solid var(--k, var(--green)); padding-top: 0.9rem; }
.techs > .t-wind, .tech.t-wind { --k: var(--c-wind); } .techs > .t-solar, .tech.t-solar { --k: var(--c-solar); } .techs > .t-storage, .tech.t-storage { --k: var(--c-storage); }
.techs p { color: var(--ink-2); font-size: 0.9375rem; }
.techs ul { list-style: none; margin: 0.2rem 0 0; padding: 0; display: grid; gap: 0.35rem; }
.techs li { font: 400 0.8125rem/1.45 var(--mono); color: var(--ink-2); padding-left: 0.9rem; position: relative; }
.techs li::before { content: ""; position: absolute; left: 0; top: 0.55em; width: 5px; height: 5px; background: var(--k, var(--green)); border-radius: 50%; }
@media (max-width: 860px) { .techs { grid-template-columns: minmax(0, 1fr); } }

/* header, navigation, motion, form, footer */
html { scroll-padding-top: 5.5rem; scroll-behavior: smooth; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 1rem; top: -3rem; z-index: 50; background: var(--ink); color: var(--paper); padding: 0.5rem 0.8rem; border-radius: 3px; }
.skip:focus { top: calc(env(safe-area-inset-top, 0px) + 0.5rem); }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 30; background: var(--paper); }

.site-head { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: var(--paper); border-bottom: 1px solid transparent; transition: border-color .2s, box-shadow .2s; }
.site-head.scrolled { border-bottom-color: var(--rule); }
.top nav { align-items: center; gap: 1.35rem; }
.top nav a:not(.btn) { position: relative; padding-block: 0.3rem; }
.top nav a:not(.btn)::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--green); transform: scaleX(0); transform-origin: left; transition: transform .25s; }
.top nav a:not(.btn):hover::after, .top nav a[aria-current]::after { transform: scaleX(1); }
.top nav a[aria-current] { color: var(--ink); }
.btn-sm { padding: 0.55rem 0.9rem; font-size: 0.875rem; background: var(--green); color: var(--on-green); }
.btn-sm:hover { background: var(--ink); color: var(--paper); }
.top nav a.btn-sm { color: var(--on-green); }
.top nav a.btn-sm:hover { color: var(--paper); }
.menu-btn { display: none; background: none; border: 1px solid var(--ink-3); border-radius: 4px; width: 44px; height: 40px; cursor: pointer; color: var(--ink); }
.menu-btn .bars, .menu-btn .bars::before, .menu-btn .bars::after { display: block; width: 18px; height: 2px; background: currentColor; margin: 0 auto; position: relative; transition: transform .2s, opacity .2s; }
.menu-btn .bars::before, .menu-btn .bars::after { content: ""; position: absolute; left: 0; }
.menu-btn .bars::before { top: -6px; } .menu-btn .bars::after { top: 6px; }
.site-head.open .bars { background: transparent; }
.site-head.open .bars::before { transform: translateY(6px) rotate(45deg); }
.site-head.open .bars::after { transform: translateY(-6px) rotate(-45deg); }

/* hero chart: points settle in, lines draw */
#pc .pt { transform-box: fill-box; transform-origin: center; animation: pt-in .45s cubic-bezier(.2,.7,.3,1) both; }
@keyframes pt-in { from { opacity: 0; transform: scale(.2); } }
#pc .draw { stroke-dasharray: 1; stroke-dashoffset: 0; animation: draw-in .9s ease-out both; }
@keyframes draw-in { from { stroke-dashoffset: 1; } }
#pc.quick .pt { animation-duration: .25s; }
#pc.quick .draw { animation-duration: .35s; }
@media (max-width: 600px) { #pc text { font-size: 17px; } }

/* data flow connectors: data moving left to right */
.flow .arrow { display: grid; place-items: center; width: 2.2rem; }
.flow .arrow span { display: block; width: 100%; height: 2px; background: repeating-linear-gradient(90deg, var(--green) 0 6px, transparent 6px 12px); background-size: 24px 2px; position: relative; }
.flow.run .arrow span { animation: flow 1.2s linear 3; }
.flow .arrow span::after { content: ""; position: absolute; right: -2px; top: -4px; border: 5px solid transparent; border-left-color: var(--green); border-right: 0; }
@keyframes flow { to { background-position: 24px 0; } }

/* meeting form */
.mform { display: grid; gap: 0.9rem; background: var(--panel); border: 1px solid var(--rule); border-radius: 6px; padding: 1.25rem; max-width: 40rem; }
.mform p { margin: 0; display: grid; gap: 0.3rem; }
.mform .row2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.9rem; }
.mform label, .mform legend { font: 500 0.8125rem/1.4 var(--body); color: var(--ink-2); }
.mform input:not([type=checkbox]), .mform textarea { font: 400 1rem/1.4 var(--body); color: var(--ink); background: var(--paper); border: 1px solid var(--ink-3); border-radius: 4px; padding: 0.6rem 0.7rem; width: 100%; }
.mform input:focus, .mform textarea:focus { outline: 2px solid var(--green); outline-offset: 1px; border-color: transparent; }
.mform fieldset { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; }
.mform legend { width: 100%; margin-bottom: 0.35rem; }
.mform .chk { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.9375rem; color: var(--ink); }
.mform .chk input { accent-color: var(--green); width: 1rem; height: 1rem; }
.mform .actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.8rem 1.2rem; }
.mform .btn { border: 0; cursor: pointer; font-family: var(--body); }
.mform .hp { position: absolute; left: -9999px; }
.mform [hidden] { display: none; }
.mform .form-note { display: block; font-size: 0.75rem; }
.form-status { font-size: 0.9375rem; color: var(--ink); background: var(--green-soft); border-radius: 4px; padding: 0.7rem 0.8rem; }

/* footer */
.site-foot { border-top: 1px solid var(--rule); background: var(--panel); margin-top: 0; }
.foot-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) repeat(4, minmax(0, 1fr)); gap: 2rem; padding-block: 3rem 2rem; }
.foot-brand { display: grid; gap: 0.9rem; align-content: start; justify-items: start; }
.foot-brand img { height: 40px; width: auto; }
.foot-brand p { color: var(--ink-2); font-size: 0.9375rem; max-width: 22rem; }
.site-foot ul { list-style: none; margin: 0.7rem 0 0; padding: 0; display: grid; gap: 0.45rem; font-size: 0.9375rem; color: var(--ink-2); }
.site-foot ul a { text-decoration: none; }
.site-foot ul a:hover { text-decoration: underline; color: var(--ink); }
.foot-base { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-block: 1.2rem 2rem; border-top: 1px solid var(--rule); font: 400 0.8125rem/1.5 var(--mono); color: var(--ink-3); }

@media (max-width: 960px) {
  .menu-btn { display: block; }
  .top { flex-wrap: nowrap; }
  .top nav { display: none; }
  .site-head.open nav { max-height: calc(100dvh - 4.5rem); overflow-y: auto; display: flex; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; gap: 0; background: var(--paper); border-bottom: 1px solid var(--rule); padding: 0.5rem max(20px, env(safe-area-inset-right, 0px)) 1.2rem max(20px, env(safe-area-inset-left, 0px)); box-shadow: 0 12px 20px -16px rgba(18, 33, 26, .5); }
  .site-head.open nav a:not(.btn) { display: block; padding: 0.75rem 0; border-bottom: 1px solid var(--rule); font-size: 1.0625rem; }
  .site-head.open nav a:not(.btn)::after { display: none; }
  .site-head.open nav a.btn-sm { display: block; text-align: center; margin-top: 1rem; padding: 0.8rem; }
  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-brand { grid-column: 1 / -1; }
}
@media (max-width: 520px) { .mform .row2 { grid-template-columns: minmax(0, 1fr); } }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* FAQ */
.faq { display: grid; border-top: 1px solid var(--rule); }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; padding: 1rem 0; font: 600 1.0625rem/1.35 var(--display); list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 1.25rem/1 var(--mono); color: var(--green); }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--ink-2); padding-bottom: 1rem; max-width: 44rem; }

/* language link, Spanish page */
.lang { font: 500 0.8125rem/1 var(--body); }
.es-hero { grid-template-columns: minmax(0, 48rem); }

/* talks and panels */
.talks-h { font-size: 1rem; margin-top: 2rem; }
.talks { list-style: none; margin: 0.6rem 0 0; padding: 0; border-top: 1px solid var(--rule); }
.talks li { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: 0.2rem 1.5rem; padding-block: 0.7rem; border-bottom: 1px solid var(--rule); font-size: 0.9375rem; }
.talks li > span:last-child { display: grid; gap: 0.15rem; }
.talks small { font: 400 0.75rem/1.5 var(--mono); color: var(--ink-3); }
.talks .talk-link { font-size: 0.875rem; justify-self: start; }
.talks .talk-link::after { content: " →"; }
@media (max-width: 460px) { .talks li { grid-template-columns: minmax(0, 1fr); } }

/* data section: heading above, flowchart across the full width */
.sec-wide { grid-template-columns: minmax(0, 1fr); }
.sec-wide .sec-head { max-width: 46rem; }
.sec-wide .flow { grid-template-columns: minmax(0, 1fr) 2.2rem minmax(0, 1.05fr) 2.2rem minmax(0, 1fr); }
@media (max-width: 860px) { .sec-wide .flow { grid-template-columns: minmax(0, 1fr); } }

/* ---------- note figures and diagrams ---------- */
.nfig { margin: 0.5rem 0; display: grid; gap: 0.4rem; }
.nfig img { width: 100%; height: auto; border: 1px solid var(--rule); border-radius: 4px; background: #fff; }
.dg { margin: 0.75rem 0 0.5rem; display: grid; gap: 0.6rem; }
.dg figcaption { font-size: 0.75rem; color: var(--ink-3); }
.dg ol { list-style: none; margin: 0; padding: 0; }
.dg strong { display: block; font: 600 0.9375rem/1.3 var(--display); color: inherit; }
.dg span { font-size: 0.875rem; line-height: 1.45; }
.dg-layers { display: grid; gap: 6px; }
.dg-layers li { border: 1px solid var(--rule); border-radius: 6px; padding: 0.8rem 1.1rem; display: grid; grid-template-columns: 8rem minmax(0, 1fr); gap: 0.25rem 1rem; align-items: baseline; color: var(--ink); }
.dg-layers li span { color: var(--ink-2); }
.dg-layers .l-owner { background: var(--green); border-color: var(--green); color: var(--paper); }
.dg-layers .l-owner span { color: var(--paper); }
.dg-ba { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; }
.dg-ba > div { border-radius: 6px; padding: 1rem 1.1rem; display: grid; gap: 0.6rem; align-content: start; border: 1px solid var(--rule); background: var(--panel); }
.dg-ba .ba-after { border-color: var(--green); box-shadow: inset 0 3px 0 var(--green); }
.dg-ba .ba-before { box-shadow: inset 0 3px 0 var(--ink-3); }
.dg-ba .ba-before .label { color: var(--ink-2); }
.dg-ba ol { display: grid; gap: 0.55rem; }
.dg-ba li { display: grid; gap: 0.1rem; font-size: 0.9rem; line-height: 1.4; color: var(--ink); }
.dg-ba li .mono { font-size: 0.75rem; color: var(--ink-3); }
.dg-cov { border-collapse: collapse; width: 100%; font-size: 0.8125rem; line-height: 1.4; background: var(--panel); }
.dg-cov th, .dg-cov td { border: 1px solid var(--rule); padding: 0.5rem 0.6rem; text-align: left; vertical-align: top; color: var(--ink-2); }
.dg-cov thead th { font: 500 0.6875rem/1.3 var(--mono); text-transform: none; letter-spacing: 0.02em; color: var(--ink-2); background: var(--paper); }
.dg-cov th[scope="row"] { font: 600 0.8125rem/1.4 var(--display); text-transform: none; letter-spacing: 0; color: var(--ink); }
.dg-cov td:first-child { font-weight: 400; color: var(--ink-2); }
.dg-cov td:last-child { color: var(--ink); font-weight: 500; }
.note-steps { margin: 0; padding-left: 1.4rem; display: grid; gap: 0.4rem; }
.dg-flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.4rem; position: relative; }
.dg-flow li { position: relative; background: var(--panel); border: 1px solid var(--rule); border-radius: 6px; padding: 0.85rem 0.9rem; display: grid; gap: 0.3rem; align-content: start; }
.dg-flow li span { color: var(--ink-2); }
.dg-flow li:not(:last-child)::after { content: ""; position: absolute; right: -1.05rem; top: 50%; border: 6px solid transparent; border-left-color: var(--green); transform: translateY(-50%); }
.dg-flow .f-plat { background: var(--ink); color: var(--paper); border-color: var(--ink); } .dg-flow .f-plat span { color: #c9d3cd; }
.dg-flow .f-owner { background: var(--green); color: #fff; border-color: var(--green); } .dg-flow .f-owner span { color: #fff; }
@media (max-width: 700px) {
  .dg-ba, .dg-flow { grid-template-columns: minmax(0, 1fr); }
  .dg-flow li:not(:last-child)::after { right: auto; left: 50%; top: auto; bottom: -1.05rem; border-left-color: transparent; border-top-color: var(--green); transform: translateX(-50%); }
  .dg-layers li { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .dg-cov { display: block; background: none; }
  .dg-cov thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .dg-cov tbody { display: grid; gap: 0.6rem; }
  .dg-cov tr { display: block; background: var(--panel); border: 1px solid var(--rule); border-radius: 6px; padding: 0.75rem 0.9rem; }
  .dg-cov th, .dg-cov td { display: block; border: 0; padding: 0; }
  .dg-cov th[scope="row"] { font-size: 0.9375rem; margin-bottom: 0.2rem; }
  .dg-cov th[scope="row"]::before { content: "Site "; }
  .dg-cov td { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 0.75rem; padding-block: 0.4rem; border-top: 1px solid var(--rule); font-size: 0.875rem; }
  .dg-cov td::before { content: attr(data-label); font: 500 0.6875rem/1.4 var(--mono); letter-spacing: 0.02em; color: var(--ink-3); padding-top: 0.15em; }
}