/* Geo Constech, site styles.
   Look: pale survey paper, ink, the brand's two greens, and engineering sections as the
   main images. Numbered drawing notes sit under each drawing the way a site drawing reads.
   No framework. Modern CSS only: :has(), popover, scroll-driven animation and cross-page
   view transitions, each with a plain fallback. */

/* ---------- tokens ---------- */
:root {
  --paper: #F1F3EE;
  --paper-2: #E6EAE3;
  --paper-3: #DCE2D8;
  --ink: #121613;
  --ink-2: #4B5550;
  --rule: #CBD2CA;
  --grid: #DEE3DA;
  --green: #405F3D;      /* brand dark green, as in the logo */
  --green-hi: #96BF63;   /* brand lime, as in the logo's G */
  --logo-a: #405F3D;
  --logo-b: #96BF63;
  --grout: #C98E12; --grout-ink: #7F5600; --inv-bg: #121613; --inv-fg: #F1F3EE;
  --water: #2F6FA6;
  --soil: #CFC4A8;
  --soil-2: #B5A98A;
  --rock: #B1B6AE;
  --concrete: #D9DDD6;
  --brick: #C9A48A;
  --danger: #A33B2A;
  --font-display: "Archivo", "Arial Narrow", Arial, sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --gutter: clamp(16px, 4vw, 40px);
  --section: clamp(56px, 8vw, 112px);
  --radius: 4px;
  --top-h: 64px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0E1210; --paper-2: #161C18; --paper-3: #1E2620; --ink: #E7EBE5; --ink-2: #A3ADA6; --rule: #2A332D; --grid: #1A211C;
    --green: #A9CD7E; --green-hi: #96BF63; --logo-a: #DCE8DF; --logo-b: #96BF63;
    --grout: #E0A93A; --grout-ink: #E0A93A; --inv-bg: #1E2620; --inv-fg: #E7EBE5; --water: #6AA6DA; --soil: #5A5243; --soil-2: #463F33; --rock: #3E4540; --concrete: #3A413C; --brick: #6E5646; --danger: #E07A66;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0E1210; --paper-2: #161C18; --paper-3: #1E2620; --ink: #E7EBE5; --ink-2: #A3ADA6; --rule: #2A332D; --grid: #1A211C;
  --green: #A9CD7E; --green-hi: #96BF63; --logo-a: #DCE8DF; --logo-b: #96BF63;
  --grout: #E0A93A; --grout-ink: #E0A93A; --inv-bg: #1E2620; --inv-fg: #E7EBE5; --water: #6AA6DA; --soil: #5A5243; --soil-2: #463F33; --rock: #3E4540; --concrete: #3A413C; --brick: #6E5646; --danger: #E07A66;
  color-scheme: dark;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 96px; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration-color: var(--green); text-underline-offset: 3px; }
a:hover { color: var(--green); }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; border-radius: 2px; }
::selection { background: var(--green-hi); color: #0E1210; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 50; background: var(--ink); color: var(--paper); padding: 10px 14px; border-radius: var(--radius); }
.skip:focus { top: 12px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.wrap { max-width: 1200px; margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section); }
/* Sections below the first screen are laid out only when they come near it, which cuts the
   work a phone does on first load. "auto" makes the browser remember each real height. */
@media screen { main > section ~ section.section { content-visibility: auto; contain-intrinsic-size: auto 900px; } }
.section + .section { border-top: 1px solid var(--rule); }
.section.tight { padding-block: clamp(36px, 5vw, 64px); }
.band { background: var(--paper-2); }
.band + .section, .section + .band { border-top: 0; }

/* ---------- type ---------- */
h1, h2, h3 { margin: 0; text-wrap: balance; }
h1, .display {
  font-family: var(--font-display);
  font-stretch: 116%;
  font-weight: 800;
  font-size: clamp(2.3rem, 6vw, 4.6rem);
  line-height: 1.0;
  letter-spacing: -0.02em;
}
h1.long { font-size: clamp(2.1rem, 4.8vw, 3.7rem); }
h2 {
  font-family: var(--font-display);
  font-stretch: 108%;
  font-weight: 750;
  font-size: clamp(1.65rem, 3.3vw, 2.55rem);
  line-height: 1.08;
  letter-spacing: -0.012em;
}
h3 { font-size: 1.12rem; font-weight: 600; line-height: 1.3; }
h3.big { font-family: var(--font-display); font-stretch: 110%; font-size: clamp(1.4rem, 2.4vw, 1.9rem); font-weight: 750; line-height: 1.1; }
p { margin: 0; }
.lead { font-size: clamp(1.1rem, 1.6vw, 1.3rem); line-height: 1.55; color: var(--ink-2); max-width: 62ch; text-wrap: pretty; }
.muted { color: var(--ink-2); }
.small { font-size: 0.9rem; }
.label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0;
}
.mono { font-family: var(--font-mono); }
.prose { display: grid; gap: 1rem; max-width: 68ch; }
.prose p, .prose li { text-wrap: pretty; }
.prose ul { margin: 0; padding-left: 1.2em; display: grid; gap: 0.4rem; }
.section-head { display: grid; gap: 0.75rem; margin-bottom: clamp(28px, 4vw, 48px); max-width: 780px; }
.section-head.wide { max-width: none; }

/* ---------- header ---------- */
.util { background: var(--inv-bg); color: var(--inv-fg); font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.04em; }
.util-row { display: flex; justify-content: space-between; gap: 16px; padding-block: 7px; }
.util a { text-decoration: none; }
.util a:hover { color: var(--green-hi); }
.util-links { display: flex; gap: 22px; }
.preview-bar { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; text-align: center; padding: 6px 16px; background: var(--grout); color: #121613; }
@media (max-width: 860px) { .util { display: none; } }

.top {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 20;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
  view-transition-name: site-header;
}
.top-row { display: flex; align-items: center; gap: 20px; min-height: var(--top-h); }
.brand { display: inline-flex; align-items: center; text-decoration: none; flex: none; }
.brand:hover { color: inherit; }
.brand svg { height: 40px; width: auto; display: block; }
.brand .la, .foot-brand .la { fill: var(--logo-a); }
.brand .lb, .foot-brand .lb { fill: var(--logo-b); }
.nav { margin-left: auto; display: flex; align-items: center; gap: 2px; font-size: 0.95rem; }
.nav-link {
  font: inherit; color: inherit; background: none; border: 0; cursor: pointer;
  text-decoration: none; white-space: nowrap; padding: 10px 12px; border-radius: var(--radius);
  display: inline-flex; align-items: center; gap: 6px;
}
.nav-link:hover, .nav-link[aria-current="page"], .nav-link[aria-current="true"] { color: var(--green); }
.nav-link[aria-current="page"], .nav-link[aria-current="true"] { box-shadow: inset 0 -2px 0 var(--green); border-radius: 0; }
.chev { width: 8px; height: 8px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: translateY(-2px) rotate(45deg); }
.top-cta { margin-left: 10px; white-space: nowrap; }
.menu-btn { display: none; margin-left: auto; font: inherit; font-weight: 600; color: var(--ink); background: none; border: 1.5px solid var(--ink); border-radius: var(--radius); padding: 8px 14px; cursor: pointer; }
@media (max-width: 1180px) { .top .top-cta { display: none; } }
@media (max-width: 1080px) { .nav-link { padding: 10px 8px; } }
@media (max-width: 980px) {
  .nav { display: none; }
  .menu-btn { display: inline-flex; }
  .brand svg { height: 34px; }
  .top-row { min-height: 58px; }
}

/* popover panels: mega menus on desktop, a full menu sheet on phones */
[popover] { color: var(--ink); }
.mega {
  position: fixed;
  inset: 108px 0 auto 0;
  margin: 0 auto;
  width: min(1120px, calc(100% - 32px));
  max-height: calc(100dvh - 130px);
  overflow: auto;
  padding: clamp(18px, 3vw, 30px);
  background: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: 0 18px 50px -20px rgb(0 0 0 / .35);
}
.mega::backdrop { background: rgb(14 18 16 / .18); }
.mega-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px 28px; }
.mega-grid h2 { font-size: 0.78rem; font-family: var(--font-mono); font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); margin-bottom: 8px; }
.mega-grid a { display: block; text-decoration: none; padding: 6px 0; border-bottom: 1px solid var(--rule); font-weight: 500; }
.mega-grid a span { display: block; font-size: 0.86rem; font-weight: 400; color: var(--ink-2); }
.mega-foot { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--ink); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
@media (max-width: 1000px) { .mega-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.sheet {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100dvh;
  max-width: none;
  max-height: none;
  margin: 0;
  border: 0;
  padding: 0;
  background: var(--paper);
  overflow: auto;
}
.sheet-head { position: sticky; top: 0; display: flex; justify-content: space-between; align-items: center; padding: 10px var(--gutter); border-bottom: 1px solid var(--rule); background: var(--paper); }
.sheet-head .brand svg { height: 34px; }
.sheet-body { padding: 18px var(--gutter) 120px; display: grid; gap: 26px; }
.sheet-body h2 { font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); margin-bottom: 6px; }
.sheet-body a { display: block; padding: 11px 0; border-bottom: 1px solid var(--rule); text-decoration: none; font-weight: 500; font-size: 1.05rem; }
.sheet-body .big-links a { font-family: var(--font-display); font-stretch: 110%; font-weight: 750; font-size: 1.45rem; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--font-body); font-weight: 600; font-size: 1rem; line-height: 1.1;
  padding: 15px 22px;
  border-radius: var(--radius);
  border: 1.5px solid var(--ink);
  background: var(--ink); color: var(--paper);
  text-decoration: none; cursor: pointer; text-align: center;
  transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}
.btn:hover { background: var(--green); border-color: var(--green); color: var(--paper); }
.btn-line { background: transparent; color: var(--ink); }
.btn-line:hover { background: transparent; color: var(--green); border-color: var(--green); }
.btn-small { padding: 10px 14px; font-size: 0.9rem; }
.btn .arrow { font-family: var(--font-mono); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.text-link { font-weight: 600; text-decoration: none; }
.text-link:hover { text-decoration: underline; }

/* ---------- heroes ---------- */
.hero { padding-block: clamp(36px, 6vw, 84px) clamp(28px, 4vw, 48px); display: grid; gap: clamp(26px, 4vw, 42px); }
.hero-copy { display: grid; gap: 20px; max-width: 920px; }
.hero h1 { max-width: 16ch; }
.hero h1.long { max-width: 22ch; }
.page-hero { padding-block: clamp(28px, 5vw, 64px) clamp(28px, 4vw, 52px); display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); gap: clamp(24px, 4vw, 56px); align-items: end; }
.page-hero > * { min-width: 0; }
.page-hero .hero-copy { gap: 18px; }
@media (max-width: 900px) { .page-hero { grid-template-columns: minmax(0, 1fr); align-items: start; } }
.crumbs { font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: .05em; text-transform: uppercase; color: var(--ink-2); display: flex; gap: 8px; flex-wrap: wrap; margin: 0; padding: 0; list-style: none; }
.crumbs a { text-decoration: none; }
.crumbs li + li::before { content: "/"; margin-right: 8px; color: var(--rule); }

.glance { border: 1px solid var(--ink); background: var(--paper); }
.glance h2 { font-family: var(--font-mono); font-size: 0.74rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; padding: 10px 14px; border-bottom: 1px solid var(--ink); color: var(--ink); }
.glance dl { margin: 0; }
.glance dl > div { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 10px; padding: 10px 14px; border-top: 1px solid var(--rule); }
.glance dl > div:first-child { border-top: 0; }
.glance dt { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .05em; text-transform: uppercase; color: var(--ink-2); padding-top: 3px; }
.glance dd { margin: 0; font-size: 0.95rem; }
.glance-ol { list-style: none; margin: 0; padding: 0; counter-reset: g; }
.glance-ol li { counter-increment: g; display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 8px; padding: 10px 14px; border-top: 1px solid var(--rule); font-size: 0.95rem; }
.glance-ol li:first-child { border-top: 0; }
.glance-ol li::before { content: counter(g, decimal-leading-zero); font-family: var(--font-mono); font-size: 0.72rem; color: var(--green); padding-top: 3px; }
.glance .actions { padding: 12px 14px 14px; border-top: 1px solid var(--rule); }

/* ---------- drawings ---------- */
.drawing { border: 1px solid var(--rule); background: var(--paper); margin: 0; }
.drawing-frame { width: 100%; aspect-ratio: var(--ar, 1000 / 560); }
.drawing-frame svg { display: block; width: 100%; height: 100%; }
.drawing-foot { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px 28px; border-top: 1px solid var(--rule); padding: 16px 18px; }
.notes { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 28px; font-size: 0.9rem; color: var(--ink-2); }
.notes li { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: 8px; align-items: baseline; border-radius: 3px; transition: background-color .15s ease, color .15s ease; }
.notes li > b {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500;
  width: 21px; height: 21px; border-radius: 50%;
  border: 1px solid var(--ink-2); color: var(--ink);
  display: inline-grid; place-items: center;
}
.titleblock { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; text-transform: uppercase; border: 1px solid var(--ink-2); align-self: start; min-width: 0; }
.titleblock div { padding: 5px 10px; border-top: 1px solid var(--rule); }
.titleblock div:first-child { border-top: 0; font-weight: 500; color: var(--ink); }
.titleblock div + div { color: var(--ink-2); }
.caption { font-size: 0.88rem; color: var(--ink-2); padding: 12px 18px 16px; border-top: 1px solid var(--rule); }
.pan-hint { display: none; }
@media (max-width: 760px) {
  .drawing-frame { aspect-ratio: var(--ar-m, var(--ar)); }
  .drawing.scroll .drawing-frame { aspect-ratio: auto; overflow-x: auto; overscroll-behavior-x: contain; scrollbar-width: thin; }
  .drawing.scroll .drawing-frame svg { width: 680px; height: auto; max-width: none; }
  .drawing.scroll .pan-hint { display: block; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); padding: 8px 18px 0; }
  .drawing-foot { grid-template-columns: minmax(0, 1fr); }
  .notes { grid-template-columns: minmax(0, 1fr); }
}
/* note <-> tag highlight, no script: hover a note to find its tag, or a tag to find its note */
.drawing .tag { cursor: default; }
.drawing .tag .d-tag { transition: fill .15s ease; }
.drawing:has(.notes li[data-n="1"]:hover) .tag[data-n="1"] .d-tag, .drawing:has(.tag[data-n="1"]:hover) .tag[data-n="1"] .d-tag,
.drawing:has(.notes li[data-n="2"]:hover) .tag[data-n="2"] .d-tag, .drawing:has(.tag[data-n="2"]:hover) .tag[data-n="2"] .d-tag,
.drawing:has(.notes li[data-n="3"]:hover) .tag[data-n="3"] .d-tag, .drawing:has(.tag[data-n="3"]:hover) .tag[data-n="3"] .d-tag,
.drawing:has(.notes li[data-n="4"]:hover) .tag[data-n="4"] .d-tag, .drawing:has(.tag[data-n="4"]:hover) .tag[data-n="4"] .d-tag,
.drawing:has(.notes li[data-n="5"]:hover) .tag[data-n="5"] .d-tag, .drawing:has(.tag[data-n="5"]:hover) .tag[data-n="5"] .d-tag,
.drawing:has(.notes li[data-n="6"]:hover) .tag[data-n="6"] .d-tag, .drawing:has(.tag[data-n="6"]:hover) .tag[data-n="6"] .d-tag,
.drawing:has(.notes li[data-n="7"]:hover) .tag[data-n="7"] .d-tag, .drawing:has(.tag[data-n="7"]:hover) .tag[data-n="7"] .d-tag,
.drawing:has(.notes li[data-n="8"]:hover) .tag[data-n="8"] .d-tag, .drawing:has(.tag[data-n="8"]:hover) .tag[data-n="8"] .d-tag { fill: var(--green-hi); }
.drawing:has(.tag[data-n="1"]:hover) .notes li[data-n="1"], .drawing:has(.tag[data-n="2"]:hover) .notes li[data-n="2"],
.drawing:has(.tag[data-n="3"]:hover) .notes li[data-n="3"], .drawing:has(.tag[data-n="4"]:hover) .notes li[data-n="4"],
.drawing:has(.tag[data-n="5"]:hover) .notes li[data-n="5"], .drawing:has(.tag[data-n="6"]:hover) .notes li[data-n="6"],
.drawing:has(.tag[data-n="7"]:hover) .notes li[data-n="7"], .drawing:has(.tag[data-n="8"]:hover) .notes li[data-n="8"],
.notes li:hover { color: var(--ink); background: color-mix(in srgb, var(--green-hi) 16%, transparent); }

/* svg material classes */
.d-paper { fill: var(--paper); }
.d-inside { fill: var(--paper-2); }
.d-rock { fill: var(--rock); }
.d-rock2 { fill: color-mix(in srgb, var(--rock) 70%, var(--ink-2)); }
.d-soil { fill: var(--soil); }
.d-soil2 { fill: var(--soil-2); }
.d-conc { fill: var(--concrete); stroke: var(--ink-2); stroke-width: 1; }
.d-conc-flat { fill: var(--concrete); }
.d-brick { fill: var(--brick); stroke: var(--ink-2); stroke-width: 1; }
.d-water { fill: var(--water); fill-opacity: .18; }
.d-water-solid { fill: var(--water); fill-opacity: .42; }
.d-grout { fill: var(--grout); }
.d-grout-soft { fill: var(--grout); fill-opacity: .32; }
.d-grout-line { fill: none; stroke: var(--grout); stroke-width: 3; stroke-linecap: round; }
.d-line { fill: none; stroke: var(--ink); stroke-width: 1.5; }
.d-line2 { fill: none; stroke: var(--ink); stroke-width: 2.4; }
.d-thin { fill: none; stroke: var(--ink-2); stroke-width: 1; }
.d-joint { fill: none; stroke: var(--ink-2); stroke-width: 1.1; stroke-dasharray: 2 5; stroke-linecap: round; }
.d-dash { fill: none; stroke: var(--ink-2); stroke-width: 1.5; stroke-dasharray: 7 6; }
.d-waterline { fill: none; stroke: var(--water); stroke-width: 1.5; stroke-dasharray: 10 6; }
.d-water-arrow { fill: none; stroke: var(--water); stroke-width: 2.2; stroke-linecap: round; }
.d-water-head { fill: var(--water); }
.d-water-drop { fill: var(--water); fill-opacity: .8; }
.d-blocked { fill: none; stroke: var(--water); stroke-width: 2.2; stroke-dasharray: 3 5; stroke-linecap: round; opacity: .6; }
.d-dim { fill: none; stroke: var(--green); stroke-width: 1.6; }
.d-dimhead { fill: var(--green); }
.d-lift { fill: none; stroke: var(--green); stroke-width: 3; }
.d-lift-head { fill: var(--green); }
.d-train { fill: var(--paper-2); stroke: var(--ink-2); stroke-width: 1.2; }
.d-window { fill: var(--paper); stroke: none; }
.d-anchor { fill: none; stroke: var(--ink); stroke-width: 2.4; stroke-linecap: round; }
.d-anchor-thin { fill: none; stroke: var(--ink); stroke-width: 1.6; stroke-linecap: round; }
.d-steel { fill: var(--ink-2); }
.d-mesh { fill: none; stroke: var(--ink-2); stroke-width: .9; stroke-dasharray: 1 3; }
.d-ohe { fill: none; stroke: var(--danger); stroke-width: 1.4; stroke-dasharray: 8 4; }
.d-text { fill: var(--ink); font-family: var(--font-mono); font-size: 15px; letter-spacing: .04em; }
.d-text-2 { fill: var(--ink-2); font-family: var(--font-mono); font-size: 14px; letter-spacing: .04em; }
.d-text-s { fill: var(--ink-2); font-family: var(--font-mono); font-size: 12px; letter-spacing: .04em; }
.d-text-mid { text-anchor: middle; }
.d-text-inv { fill: var(--paper); }
.d-text-end { text-anchor: end; }
.d-text-xl { fill: var(--ink); font-family: var(--font-mono); font-size: 34px; font-weight: 500; letter-spacing: .06em; text-anchor: middle; }
.d-text-sub { fill: var(--ink-2); font-family: var(--font-mono); font-size: 22px; letter-spacing: .04em; text-anchor: middle; }
.d-big { fill: var(--green); font-family: var(--font-display); font-stretch: 110%; font-weight: 800; font-size: 30px; }
.d-tag { fill: var(--paper); stroke: var(--ink); stroke-width: 1.4; }
.d-tagtext { fill: var(--ink); font-family: var(--font-mono); font-size: 14px; font-weight: 500; text-anchor: middle; dominant-baseline: central; pointer-events: none; }
.d-gridline { fill: none; stroke: var(--grid); stroke-width: 1; }
.d-hatchline { stroke: var(--ink-2); stroke-opacity: .28; stroke-width: 1; }
.d-dot { fill: var(--ink-2); fill-opacity: .35; }
.d-track { fill: none; stroke: var(--ink); stroke-width: 4; stroke-linecap: round; }
.d-design { fill: none; stroke: var(--green); stroke-width: 2; stroke-dasharray: 10 8; }
.d-down { fill: none; stroke: var(--grout); stroke-width: 3; }
.d-down-head { fill: var(--grout); }
.d-bar { stroke: none; }
.d-bar-cem { fill: var(--rock); }
.d-bar-mfc { fill: color-mix(in srgb, var(--rock) 55%, var(--grout)); }
.d-bar-pu { fill: var(--grout); }
.d-bar-ps { fill: color-mix(in srgb, var(--grout) 60%, var(--green)); }
.d-bar-acr { fill: var(--water); fill-opacity: .7; }

@media (prefers-reduced-motion: no-preference) {
  .lift { animation: lift 1.8s cubic-bezier(.2,.7,.2,1) .4s both; }
  .pulse { animation: pulse 1.8s ease-out .4s both; transform-box: fill-box; transform-origin: center; }
  @supports (animation-timeline: view()) {
    .drawing .tag { animation: tag-in linear both; animation-timeline: view(); animation-range: entry 10% cover 30%; transform-box: fill-box; transform-origin: center; }
    .reveal { animation: reveal linear both; animation-timeline: view(); animation-range: entry 0% cover 22%; }
  }
}
@keyframes lift { from { transform: translateY(12px); } to { transform: translateY(0); } }
@keyframes pulse { 0% { transform: scale(.6); } 60% { transform: scale(1.25); } 100% { transform: scale(1); } }
@keyframes tag-in { from { opacity: 0; transform: scale(.4); } to { opacity: 1; transform: scale(1); } }
@keyframes reveal { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }

/* ---------- results and figures ---------- */
.results { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.results.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.result { padding: 18px 18px 18px 0; display: grid; gap: 6px; align-content: start; }
.result + .result { padding-left: 18px; border-left: 1px solid var(--rule); }
.figure {
  font-family: var(--font-display); font-stretch: 100%; font-weight: 750;
  font-size: clamp(2.1rem, 4.4vw, 3.3rem); line-height: 1; letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.figure small { font-size: 0.45em; font-weight: 600; letter-spacing: 0; margin-left: 4px; }
.result p { font-size: 0.95rem; color: var(--ink-2); max-width: 32ch; }
.certified { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; padding-top: 14px; font-size: 0.95rem; color: var(--ink-2); }
.seal { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--green); border: 1px solid var(--green); padding: 3px 8px; border-radius: 3px; white-space: nowrap; }
.seal.amber { color: var(--grout-ink); border-color: var(--grout); }
.seal.plain { color: var(--ink-2); border-color: var(--rule); }
@media (max-width: 760px) {
  .results, .results.four { grid-template-columns: minmax(0, 1fr); }
  .result, .result + .result { padding: 14px 0; border-left: 0; }
  .result + .result { border-top: 1px solid var(--rule); }
}
.record { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.record > div { padding: 4px 20px 4px 0; display: grid; gap: 6px; }
.record > div + div { padding-left: 20px; border-left: 1px solid var(--rule); }
.record p { font-size: 0.95rem; color: var(--ink-2); }
@media (max-width: 860px) {
  .record { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 0; }
  .record > div:nth-child(odd) { padding-left: 0; border-left: 0; }
}

/* ---------- grids, cards, lists ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(24px, 4vw, 56px); align-items: start; }
.grid-2 > * { min-width: 0; }
.grid-2.center { align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.grid-3 > * { min-width: 0; }
@media (max-width: 960px) { .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 860px) { .grid-2 { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 620px) { .grid-3 { grid-template-columns: minmax(0, 1fr); } }

.sectors { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); border-top: 1px solid var(--ink); }
.sector { padding: 20px 20px 22px 0; display: grid; gap: 10px; align-content: start; border-bottom: 1px solid var(--rule); text-decoration: none; }
.sector h3 { font-family: var(--font-display); font-stretch: 110%; font-size: 1.25rem; font-weight: 750; }
.sector p { font-size: 0.95rem; color: var(--ink-2); }
.sector .go { font-weight: 600; font-size: 0.95rem; color: var(--green); }
a.sector:hover h3 { color: var(--green); }

.card { border: 1px solid var(--rule); background: var(--paper); padding: 18px; display: grid; gap: 10px; align-content: start; text-decoration: none; position: relative; transition: border-color .15s ease, transform .15s ease; }
a.card:hover { border-color: var(--ink); color: inherit; }
a.card:hover h3 { color: var(--green); }
.card h3 { font-size: 1.08rem; }
.card p { font-size: 0.93rem; color: var(--ink-2); }
.card .meta { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .05em; text-transform: uppercase; color: var(--ink-2); }
.card.featured { border-color: var(--ink); }
.ext { margin-left: 4px; font-family: var(--font-mono); font-size: 0.85em; font-weight: 400; }
.card-go { margin-top: auto; padding-top: 4px; }
.card-family .stretch::after { content: ""; position: absolute; inset: 0; }
.card-family:hover, .card-out:hover { border-color: var(--green); }
.card-family:focus-within { outline: 2px solid var(--green); outline-offset: 2px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 270px), 1fr)); gap: 12px; }
.card .thumb { margin: -18px -18px 4px; aspect-ratio: 16 / 9; overflow: hidden; background: var(--paper-2); border-bottom: 1px solid var(--rule); }
.card .thumb img, .card .thumb svg { width: 100%; height: 100%; object-fit: cover; display: block; }
.card .badges { display: flex; flex-wrap: wrap; gap: 6px; }

.case-feature { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); border: 1px solid var(--ink); background: var(--paper); }
.case-feature > * { min-width: 0; }
.case-feature .case-text { padding: clamp(22px, 3vw, 36px); display: grid; gap: 16px; align-content: start; }
.case-feature .case-art { border-left: 1px solid var(--rule); background: var(--paper-2); display: grid; }
.case-feature .case-art svg { width: 100%; height: 100%; display: block; }
.mini-results { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; border-top: 1px solid var(--rule); padding-top: 14px; }
.mini-results b { display: block; font-family: var(--font-display); font-size: 1.6rem; font-weight: 750; line-height: 1.05; font-variant-numeric: tabular-nums; }
.mini-results span { font-size: 0.82rem; color: var(--ink-2); }
@media (max-width: 860px) {
  .case-feature { grid-template-columns: minmax(0, 1fr); }
  .case-feature .case-art { border-left: 0; border-top: 1px solid var(--rule); aspect-ratio: 16 / 10; }
}

.rows { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.rows li { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr) minmax(0, 1.25fr); gap: 6px 24px; padding: 16px 0; border-bottom: 1px solid var(--rule); align-items: baseline; }
.rows li > * { min-width: 0; }
.rows .name { font-weight: 600; }
.rows a.name { text-decoration: none; }
.rows a.name:hover { text-decoration: underline; }
.rows .meta { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: .03em; color: var(--ink-2); }
.rows .what { font-size: 0.95rem; color: var(--ink-2); }
.rows .what .ev { display: block; margin: 3px 0 5px; font-size: 0.86rem; }
.hero-proof { padding-top: 0; max-width: 62ch; }
@media (max-width: 760px) { .rows li { grid-template-columns: minmax(0, 1fr); } }

.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(var(--cols, 4), minmax(0, 1fr)); gap: 0 clamp(18px, 2.4vw, 32px); counter-reset: step; }
.steps li { counter-increment: step; padding: 16px 0 8px; display: grid; gap: 8px; align-content: start; border-top: 1px solid var(--ink); }
.steps li::before { content: counter(step, decimal-leading-zero); font-family: var(--font-mono); font-size: 0.8rem; color: var(--green); letter-spacing: .06em; }
.steps p { font-size: 0.95rem; color: var(--ink-2); }
@media (max-width: 960px) { .steps { grid-template-columns: minmax(0, 1fr); } .steps li + li { border-top-color: var(--rule); } }
.methods { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(24px, 4vw, 56px); border-top: 1px solid var(--ink); }
.methods > a, .methods > div { padding: 15px 0; border-bottom: 1px solid var(--rule); display: grid; gap: 4px; min-width: 0; text-decoration: none; }
.methods > a:hover h3 { color: var(--green); }
.methods p { font-size: 0.95rem; color: var(--ink-2); }
@media (max-width: 760px) { .methods { grid-template-columns: minmax(0, 1fr); } }

.ticks { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.ticks li { display: grid; grid-template-columns: 18px minmax(0, 1fr); gap: 10px; text-wrap: pretty; }
.ticks li::before { content: ""; width: 10px; height: 10px; margin-top: 0.55em; background: var(--green-hi); }
.ticks.amber li::before { background: var(--grout); }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 170px), 1fr)); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule); margin: 0; }
.facts > div { padding: 14px 16px 14px 0; display: grid; gap: 4px; min-width: 0; }
.facts dt { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); }
.facts dd { margin: 0; font-weight: 600; }
.evidence { display: flex; gap: 12px; align-items: flex-start; border: 1px solid var(--green); border-left-width: 4px; padding: 12px 14px; background: color-mix(in srgb, var(--green-hi) 8%, var(--paper)); font-size: 0.95rem; }
.evidence.pending { border-color: var(--grout); background: color-mix(in srgb, var(--grout) 8%, var(--paper)); }
.challenge { display: grid; gap: 8px; padding: 18px 0; border-bottom: 1px solid var(--rule); }
.challenge:first-child { border-top: 1px solid var(--ink); }
.challenges-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 clamp(24px, 4vw, 56px); }
.challenges-grid .challenge:nth-child(2) { border-top: 1px solid var(--ink); }
@media (max-width: 760px) { .challenges-grid { grid-template-columns: minmax(0, 1fr); } .challenges-grid .challenge:nth-child(2) { border-top: 0; } }
.challenge p { color: var(--ink-2); font-size: 0.98rem; }
.pull { font-family: var(--font-display); font-stretch: 112%; font-weight: 750; font-size: clamp(1.55rem, 3.4vw, 2.6rem); line-height: 1.12; letter-spacing: -0.012em; max-width: 26ch; text-wrap: balance; margin: 0; }

/* ---------- problem finder (radio chips, no script) ---------- */
.finder { border: 1px solid var(--ink); background: var(--paper); }
.finder fieldset { border: 0; margin: 0; padding: clamp(16px, 2.6vw, 24px); border-bottom: 1px solid var(--rule); }
.finder legend { padding: 0; margin-bottom: 12px; font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); float: left; width: 100%; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; clear: both; }
.chip { position: relative; }
.chip input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.chip span { display: inline-block; border: 1.5px solid var(--rule); border-radius: 999px; padding: 9px 14px; font-size: 0.95rem; font-weight: 500; transition: border-color .15s, background-color .15s, color .15s; }
.chip input:hover + span { border-color: var(--ink); }
.chip input:focus-visible + span { outline: 2px solid var(--green); outline-offset: 2px; }
.chip input:checked + span { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.answers > .answer { display: none; padding: clamp(18px, 3vw, 30px); gap: 18px; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); }
.answer > * { min-width: 0; }
.answer h3 { font-family: var(--font-display); font-stretch: 110%; font-size: clamp(1.3rem, 2.2vw, 1.7rem); font-weight: 750; line-height: 1.12; }
.answer .proof { border-left: 3px solid var(--green-hi); padding-left: 16px; display: grid; gap: 8px; align-content: start; }
.answer .proof b { font-family: var(--font-display); font-size: 1.5rem; line-height: 1.05; }
@media (max-width: 760px) { .answers > .answer { grid-template-columns: minmax(0, 1fr); } }
.finder:has(#pf-1:checked) .answer[data-a="1"], .finder:has(#pf-2:checked) .answer[data-a="2"],
.finder:has(#pf-3:checked) .answer[data-a="3"], .finder:has(#pf-4:checked) .answer[data-a="4"],
.finder:has(#pf-5:checked) .answer[data-a="5"], .finder:has(#pf-6:checked) .answer[data-a="6"],
.finder:has(#pf-7:checked) .answer[data-a="7"], .finder:has(#pf-8:checked) .answer[data-a="8"] { display: grid; }
@supports not selector(:has(*)) { .answers > .answer { display: grid; border-top: 1px solid var(--rule); } }

/* ---------- compare table ---------- */
.compare { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.compare th, .compare td { padding: 12px 10px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.compare thead th { font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); border-bottom: 1px solid var(--ink); }
.compare td.y, .compare td.n, .compare td.p { text-align: center; width: 16%; font-weight: 600; }
.compare td.y { color: var(--green); }
.compare td.n { color: var(--ink-2); }
.compare td.p { color: var(--grout-ink); }
.compare tr.us td, .compare th.us { background: color-mix(in srgb, var(--green-hi) 12%, transparent); }
.table-wrap { overflow-x: auto; }
.choose { width: 100%; border-collapse: collapse; font-size: 0.94rem; min-width: 640px; }
.choose th, .choose td { padding: 12px 10px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.choose thead th { font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); border-bottom: 1px solid var(--ink); }
.choose td:first-child { font-weight: 600; }

/* ---------- quotes, certificates, clients ---------- */
.quote { border-left: 3px solid var(--green); padding: 4px 0 4px 22px; display: grid; gap: 12px; max-width: 780px; margin: 0; }
.quote blockquote { margin: 0; font-family: var(--font-display); font-stretch: 100%; font-weight: 600; font-size: clamp(1.2rem, 2.1vw, 1.55rem); line-height: 1.3; text-wrap: pretty; }
.quote figcaption { font-size: 0.9rem; color: var(--ink-2); }
.fact-block { border-left: 3px solid var(--green); padding: 4px 0 4px 22px; display: grid; gap: 8px; max-width: 780px; }
.fact-block p { color: var(--ink-2); font-size: 0.98rem; }
.iso { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.iso > div { border: 1px solid var(--rule); padding: 16px; display: grid; gap: 4px; min-width: 0; background: var(--paper); }
.iso b { font-family: var(--font-display); font-size: 1.3rem; font-weight: 750; }
.iso span { font-size: 0.88rem; color: var(--ink-2); }
@media (max-width: 760px) { .iso { grid-template-columns: minmax(0, 1fr); } }
.clients { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px clamp(24px, 4vw, 56px); }
.clients ul { list-style: none; margin: 8px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.clients li { border: 1px solid var(--rule); padding: 7px 11px; font-size: 0.92rem; background: var(--paper); }
@media (max-width: 760px) { .clients { grid-template-columns: minmax(0, 1fr); } }

/* ---------- photos ---------- */
.photo { margin: 0; }
.photo img { width: 100%; aspect-ratio: var(--ar, 16 / 7); object-fit: cover; background: var(--paper-2); }
.photo figcaption { font-size: 0.86rem; color: var(--ink-2); padding-top: 10px; }
.photo-tag { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--green); margin-right: 8px; }
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.pair figure { margin: 0; position: relative; }
.pair img { width: 100%; aspect-ratio: 5 / 4; object-fit: cover; background: #000; }
.pair figcaption { position: absolute; left: 10px; top: 10px; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .08em; text-transform: uppercase; background: var(--paper); color: var(--ink); padding: 4px 8px; }
.gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: 12px; }
.pending { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.pending div { border: 1.5px dashed var(--rule); aspect-ratio: 4 / 3; display: grid; place-items: center; text-align: center; padding: 10px; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .04em; text-transform: uppercase; color: var(--ink-2); }
@media (max-width: 760px) { .pending { grid-template-columns: repeat(2, minmax(0, 1fr)); } .pair { grid-template-columns: minmax(0, 1fr); } }

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; list-style: none; padding: 16px 36px 16px 0; font-weight: 600; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 6px; top: 12px; font-family: var(--font-mono); font-size: 1.3rem; color: var(--green); }
.faq details[open] summary::after { content: "–"; }
.faq details > div { padding: 0 0 18px; color: var(--ink-2); max-width: 72ch; display: grid; gap: 10px; }

/* ---------- filters (projects) ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.f-all:checked ~ .cards .card { display: grid; }
.filterable:has(#f-rail:checked) .cards .card:not([data-s~="rail"]),
.filterable:has(#f-tunnel:checked) .cards .card:not([data-s~="tunnel"]),
.filterable:has(#f-hydro:checked) .cards .card:not([data-s~="hydro"]),
.filterable:has(#f-heritage:checked) .cards .card:not([data-s~="heritage"]),
.filterable:has(#f-infra:checked) .cards .card:not([data-s~="infra"]) { display: none; }

/* ---------- contact ---------- */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.contact-grid > * { min-width: 0; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: minmax(0, 1fr); } }
.direct { display: grid; gap: 14px; margin-top: 24px; }
.direct-row { display: grid; gap: 2px; }
.direct-row .val { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 1.15rem; font-weight: 600; }
.direct-row .val a { text-decoration: none; }
.copy { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: .05em; text-transform: uppercase; border: 1px solid var(--rule); background: transparent; color: var(--ink-2); padding: 4px 8px; border-radius: 3px; cursor: pointer; }
.copy:hover { border-color: var(--green); color: var(--green); }
form.enquiry { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; border: 1px solid var(--ink); padding: clamp(18px, 3vw, 28px); background: var(--paper); }
form.enquiry .full { grid-column: 1 / -1; }
form.enquiry label { display: grid; gap: 6px; font-size: 0.86rem; font-weight: 600; min-width: 0; }
form.enquiry label .opt { font-weight: 400; color: var(--ink-2); }
form.enquiry label > span:first-child { display: block; }
form.enquiry input, form.enquiry select, form.enquiry textarea {
  font: inherit; font-weight: 400; font-size: 1rem; color: var(--ink);
  background: var(--paper); border: 1px solid var(--ink-2); border-radius: 3px; padding: 11px 12px; width: 100%; min-width: 0;
}
form.enquiry textarea { min-height: 120px; resize: vertical; }
form.enquiry input:focus, form.enquiry select:focus, form.enquiry textarea:focus { outline: 2px solid var(--green); outline-offset: 1px; border-color: var(--green); }
form.enquiry input:user-invalid, form.enquiry textarea:user-invalid { border-color: var(--danger); }
form.enquiry .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-note { grid-column: 1 / -1; font-size: 0.86rem; color: var(--ink-2); }
.form-status { grid-column: 1 / -1; border-left: 3px solid var(--green); padding: 8px 12px; font-size: 0.95rem; }
.form-status.err { border-color: var(--danger); }
@media (max-width: 560px) { form.enquiry { grid-template-columns: minmax(0, 1fr); } }

/* ---------- guides ---------- */
.guide-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.guide-list li { border-bottom: 1px solid var(--rule); }
.guide-list a { display: grid; gap: 6px; padding: 22px 0; text-decoration: none; color: var(--ink); max-width: 75ch; }
.guide-list .meta { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); }
.guide-list .t { font-family: var(--font-display); font-stretch: 108%; font-weight: 750; font-size: clamp(1.3rem, 2.4vw, 1.75rem); line-height: 1.12; text-wrap: balance; }
.guide-list .d { color: var(--ink-2); }
.guide-list a:hover .t { color: var(--green); }
.byline { margin-top: 18px; font-family: var(--font-mono); font-size: 0.76rem; letter-spacing: .04em; color: var(--ink-2); }
.pending-note { color: var(--grout-ink); }
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: clamp(28px, 5vw, 64px); align-items: start; }
.article { max-width: 70ch; gap: 0; grid-template-columns: minmax(0, 1fr); min-width: 0; }
.article > section { display: grid; grid-template-columns: minmax(0, 1fr); min-width: 0; gap: 1rem; padding-block: 0 2.2rem; scroll-margin-top: 96px; }
.article h2 { font-size: clamp(1.35rem, 2.3vw, 1.8rem); }
.article .drawing, .article .results { margin-top: 0.4rem; }
.toc { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 92px); display: grid; gap: 14px; border-top: 1px solid var(--ink); padding-top: 14px; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; counter-reset: t; }
.toc li { counter-increment: t; display: grid; grid-template-columns: 30px minmax(0, 1fr); font-size: 0.92rem; line-height: 1.35; }
.toc li::before { content: counter(t, decimal-leading-zero); font-family: var(--font-mono); font-size: 0.72rem; color: var(--green); padding-top: 2px; }
.toc a { text-decoration: none; color: var(--ink-2); }
.toc a:hover { color: var(--ink); text-decoration: underline; }
.toc-case { display: grid; gap: 6px; margin-top: 8px; padding: 14px; border: 1px solid var(--rule); background: var(--paper-2); text-decoration: none; color: var(--ink); }
.toc-case span:last-child { color: var(--ink-2); font-size: 0.9rem; }
@media (max-width: 960px) { .article-grid { grid-template-columns: minmax(0, 1fr); } .toc { position: static; grid-row: 1; } }
.table-fig { margin: 0.4rem 0 0; }
.table-fig figcaption { margin-top: 10px; font-size: 0.85rem; color: var(--ink-2); }
.compare.num td, .compare.num thead th:not(:first-child) { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.compare.num td.y { text-align: right; width: auto; }
.compare.num tbody th { font-weight: 500; }
@media (max-width: 560px) {
  .compare.num { font-size: 0.86rem; }
  .compare.num th, .compare.num td { padding: 10px 5px; }
  .compare.num th:first-child { padding-left: 0; }
  .compare.num td:last-child, .compare.num th:last-child { padding-right: 0; }
  .compare.num td, .compare.num thead th:not(:first-child) { white-space: normal; }
  .compare.num thead th { letter-spacing: .02em; }
}

/* ---------- research ---------- */
.paper-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.paper-list li { display: grid; gap: 6px; padding: 24px 0; border-bottom: 1px solid var(--rule); max-width: 80ch; scroll-margin-top: 96px; }
.paper-list .meta { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: .06em; text-transform: uppercase; color: var(--green); }
.paper-list h3 { font-family: var(--font-display); font-stretch: 104%; font-weight: 700; font-size: clamp(1.12rem, 1.9vw, 1.35rem); line-height: 1.2; text-wrap: balance; }
.paper-list p { color: var(--ink-2); }
.paper-list .by { color: var(--ink); font-weight: 500; }
.paper-list .venue { font-family: var(--font-mono); font-size: 0.8rem; }
.cards.cards-2 { grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); max-width: 780px; }
.card-links { display: flex; flex-wrap: wrap; gap: 6px 20px; margin: 4px 0 0; font-size: 0.93rem; }
.card-links .muted { font-size: 0.88rem; }
.rows .what .text-link { white-space: nowrap; font-size: 0.9rem; }

/* ---------- CTA band ---------- */
.cta { border-top: 1px solid var(--ink); padding-top: 24px; display: flex; justify-content: space-between; gap: 18px 28px; flex-wrap: wrap; align-items: center; }
.cta h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); }
.cta p { color: var(--ink-2); margin-top: 6px; max-width: 60ch; }
.cta-dark { background: var(--inv-bg); color: var(--inv-fg); }
.cta-dark .cta { border-top-color: transparent; padding-top: 0; }
.cta-dark .cta p { color: color-mix(in srgb, var(--inv-fg) 72%, var(--inv-bg)); }
.cta-dark .btn { background: var(--inv-fg); color: var(--inv-bg); border-color: var(--inv-fg); }
.cta-dark .btn:hover { background: var(--green-hi); border-color: var(--green-hi); color: #0E1210; }
.cta-dark .btn-line { background: transparent; color: var(--inv-fg); border-color: var(--inv-fg); }
.cta-dark .btn-line:hover { color: var(--green-hi); border-color: var(--green-hi); background: transparent; }

/* ---------- footer, phone action bar ---------- */
.foot { border-top: 1px solid var(--ink); padding-block: 40px 28px; font-size: 0.92rem; color: var(--ink-2); }
.foot-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) repeat(3, minmax(0, 1fr)); gap: 28px 40px; }
.foot-grid > * { min-width: 0; display: grid; gap: 7px; align-content: start; }
.foot h2 { font-family: var(--font-mono); font-size: 0.74rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--ink); margin: 0 0 4px; }
.foot a { text-decoration: none; }
.foot a:hover { text-decoration: underline; }
.foot-brand svg { height: 44px; width: auto; margin-bottom: 6px; }
.foot-base { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px 20px; margin-top: 30px; padding-top: 16px; border-top: 1px solid var(--rule); font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .03em; }
@media (max-width: 960px) { .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .foot-brand { grid-column: 1 / -1; } }
@media (max-width: 560px) { .foot-grid { grid-template-columns: minmax(0, 1fr); } }
.actionbar { display: none; }
@media (max-width: 860px) {
  .actionbar {
    display: grid; grid-template-columns: 1fr 1.2fr 1.5fr; gap: 8px;
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 15;
    padding: 8px 12px calc(8px + env(safe-area-inset-bottom, 0px));
    background: color-mix(in srgb, var(--paper) 94%, transparent);
    -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
    border-top: 1px solid var(--rule);
  }
  .actionbar .btn { padding: 13px 6px; font-size: 0.92rem; white-space: nowrap; }
  body { padding-bottom: 76px; }
}

/* ---------- page transitions (supporting browsers only) ---------- */
@view-transition { navigation: auto; }
@media (prefers-reduced-motion: reduce) { @view-transition { navigation: none; } }
::view-transition-old(root) { animation: 160ms ease both vt-out; }
::view-transition-new(root) { animation: 220ms ease both vt-in; }
@keyframes vt-out { to { opacity: 0; } }
@keyframes vt-in { from { opacity: 0; transform: translateY(8px); } }

/* ---------- print: engineers print case studies ---------- */
@media print {
  :root { --paper: #fff; --paper-2: #fff; }
  .util, .top, .actionbar, .foot, .cta, form.enquiry, .preview-bar, .finder fieldset, .skip { display: none !important; }
  body { font-size: 11pt; }
  .section { padding-block: 18pt; }
  .drawing, .photo, .quote, .results { break-inside: avoid; }
  a { text-decoration: none; }
}

/* ---------- tender desk and document requests ---------- */
.packs { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 205px), 1fr)); gap: 12px; }
.pack { border: 1px solid var(--rule); background: var(--paper); padding: 16px; display: grid; gap: 10px; align-content: start; grid-template-rows: auto auto 1fr auto; }
.pack .btn { white-space: normal; text-align: left; }
.pack h3 { font-family: var(--font-display); font-stretch: 110%; font-size: 1.25rem; font-weight: 750; line-height: 1.15; }
.pack .ticks { margin: 0; align-content: start; align-self: start; }
.pack-go { margin: 0; padding-top: 6px; }
.pq-h { font-family: var(--font-mono); font-size: 0.76rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); margin: 28px 0 12px; }
.grid-2 > div > .pq-h:first-child { margin-top: 0; }
.pq-facts { grid-template-columns: minmax(0, 1fr); }
.pq-facts > div { grid-template-columns: minmax(110px, 0.6fr) minmax(0, 1.4fr); align-items: baseline; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--rule); }
.pq-facts > div:last-child { border-bottom: 0; }
.pq-facts dd { font-weight: 500; }
.rows.certs li { grid-template-columns: minmax(0, 1fr) auto; gap: 2px 16px; padding: 12px 0; }
.rows.certs .what { grid-column: 1 / -1; }
form.enquiry input[type=checkbox] { width: 18px; height: 18px; padding: 0; margin: 2px 0 0; accent-color: var(--green); flex: none; }
form.request fieldset.items { border: 0; padding: 0; margin: 0; min-width: 0; }
form.request fieldset.items legend { font-size: 0.86rem; font-weight: 600; padding: 0; margin-bottom: 8px; }
form.request .items-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr)); gap: 8px; }
form.request fieldset.items legend .opt { font-weight: 400; color: var(--ink-2); }
form.request label.item { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: start; border: 1.5px solid var(--rule); border-radius: 3px; padding: 12px; cursor: pointer; font-weight: 400; }
form.request label.item:hover { border-color: var(--ink-2); }
form.request label.item b { display: block; font-weight: 600; font-size: 0.95rem; }
form.request label.item small { display: block; color: var(--ink-2); font-size: 0.82rem; margin-top: 2px; line-height: 1.35; }
form.request label.item:has(input:checked) { border-color: var(--green); background: color-mix(in srgb, var(--green) 8%, var(--paper)); }
form.request label.item:has(input:focus-visible) { outline: 2px solid var(--green); outline-offset: 2px; }
form.request .if-tds, form.request .if-docs { display: none; }
form.request:has(#ri-tds:checked) .if-tds, form.request:has(#ri-docs:checked) .if-docs { display: grid; }
@supports not selector(:has(*)) { form.request .if-tds, form.request .if-docs { display: grid; } }
form.enquiry label.consent { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: start; font-weight: 400; font-size: 0.9rem; }
form.enquiry input[type=file] { border-style: dashed; padding: 10px; font-size: 0.92rem; }
form.enquiry .file-list { font-size: 0.84rem; font-weight: 400; color: var(--ink-2); overflow-wrap: anywhere; }
form.enquiry .file-list:empty { display: none; }
.request-wrap { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: clamp(20px, 4vw, 48px); align-items: start; }
.request-aside details { border-top: 1px solid var(--rule); padding: 10px 0; }
.request-aside details:last-of-type { border-bottom: 1px solid var(--rule); }
.request-aside summary { cursor: pointer; font-weight: 600; }
.request-aside .ticks { margin-top: 8px; }
@media (max-width: 900px) { .request-wrap { grid-template-columns: minmax(0, 1fr); } }

/* ---------- project map (points only, no outline) ---------- */
.map-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: clamp(20px, 4vw, 48px); align-items: start; }
.map-fig { margin: 0; border: 1px solid var(--rule); background: var(--paper); padding: 10px; position: sticky; top: calc(var(--top-h) + 12px); }
.map-fig .caption { padding: 8px 4px 2px; }
.map-svg { display: block; width: 100%; height: auto; }
.map-svg .m-grat { stroke: var(--grid); stroke-width: 1; stroke-dasharray: 2 4; }
.map-svg .m-grat-t { fill: var(--ink-2); font-family: var(--font-mono); font-size: 9px; }
.map-svg .m-dot { fill: var(--green); }
.map-svg .m-live { fill: none; stroke: var(--grout); stroke-width: 2.5; }
.map-svg .m-plant { fill: var(--grout); }
.map-svg .m-hq { fill: var(--ink); }
.map-svg .m-label { fill: var(--ink); font-family: var(--font-body); font-size: 12.5px; font-weight: 600; paint-order: stroke; stroke: var(--paper); stroke-width: 3px; stroke-linejoin: round; }
.map-svg .m-count { fill: var(--green); font-family: var(--font-mono); font-size: 11px; font-weight: 500; }
.map-svg a { cursor: pointer; }
.map-svg a:hover .m-label, .map-svg a:focus-visible .m-label { fill: var(--green); text-decoration: underline; }
.map-svg a:focus { outline: none; }
.map-svg a:focus-visible .m-dot, .map-svg a:focus-visible .m-hq { stroke: var(--ink); stroke-width: 2; }
.map-svg .m-legend text { fill: var(--ink); font-family: var(--font-body); font-size: 11px; }
.map-svg .m-legend .m-note { fill: var(--ink-2); font-size: 9.5px; }
.map-svg .m-tb rect { fill: none; stroke: var(--ink-2); stroke-width: 1; }
.map-svg .m-tb text { fill: var(--ink-2); font-family: var(--font-mono); font-size: 8.5px; letter-spacing: .04em; }
.map-svg .m-scale line { stroke: var(--ink); stroke-width: 1.5; }
.map-svg .m-scale text, .map-svg .m-north text { fill: var(--ink-2); font-family: var(--font-mono); font-size: 9px; }
.map-svg .m-north path { fill: var(--ink); }
.map-svg.mini .m-label { font-size: 15px; }
.place-list { list-style: none; margin: 0; padding: 0; border-bottom: 1px solid var(--rule); }
.place { border-top: 1px solid var(--rule); padding: 12px 6px; scroll-margin-top: calc(var(--top-h) + 16px); }
.place:target { background: color-mix(in srgb, var(--green-hi) 16%, transparent); box-shadow: inset 3px 0 0 var(--green); }
.place h3 { font-size: 1.02rem; display: flex; gap: 8px; align-items: baseline; }
.place-n { font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500; color: var(--green); }
.place-sub { color: var(--ink-2); font-size: 0.86rem; margin: 2px 0 6px; }
.place ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 5px; font-size: 0.92rem; }
.place .when { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.76rem; white-space: nowrap; }
.place .seal { font-size: 0.62rem; padding: 2px 6px; }
@media (max-width: 900px) { .map-grid { grid-template-columns: minmax(0, 1fr); } .map-fig { position: static; } }
.map-home { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1fr); gap: clamp(20px, 4vw, 48px); align-items: center; margin-top: clamp(32px, 5vw, 56px); }
.map-home-art { border: 1px solid var(--rule); background: var(--paper); padding: 8px; }
.map-home h3.big { margin: 8px 0 12px; }
@media (max-width: 760px) { .map-home { grid-template-columns: minmax(0, 1fr); } }

/* ---------- calculators (/tools/) ---------- */
/* Geo Constech calculators (/tools/). Uses the site tokens only, so light and dark mode follow
   site.css. Mobile first; no horizontal scroll at 360 px. To merge into site.css, paste this
   under a "calculators" heading (the print rules can join the existing @media print block). */

/* ---------- hero: jump list and the no-script note ---------- */
.tool-jump .glance-ol a { text-decoration: none; }
.tool-jump .glance-ol a:hover { color: var(--green); text-decoration: underline; }
.tools-note, .tool-nojs { border-left: 3px solid var(--grout); padding: 8px 12px; font-size: 0.92rem; background: color-mix(in srgb, var(--grout) 9%, var(--paper)); }
.tool-nojs { margin: 0 16px 14px; }

/* ---------- one calculator ---------- */
.tool { scroll-margin-top: 72px; }
.tool-head { display: grid; gap: 10px; max-width: 780px; margin-bottom: clamp(20px, 3vw, 32px); }
.tool-use { color: var(--ink-2); max-width: 66ch; }
.tool-use strong { color: var(--ink); font-weight: 600; }
.tool-form { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(20px, 3vw, 40px); align-items: start; }
.tool-form > * { min-width: 0; }
@media (min-width: 900px) { .tool-form { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); } }
.tool [hidden] { display: none !important; }

/* inputs */
.tool-in { display: grid; gap: 18px; align-content: start; }
.tool-group { border: 0; margin: 0; padding: 0; min-width: 0; display: grid; gap: 10px; }
.tool-group legend { padding: 0; margin-bottom: 10px; font-family: var(--font-mono); font-size: 0.74rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); }
.fields { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr)); gap: 14px 16px; align-items: start; }
.fields-cap { grid-column: 1 / -1; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: .06em; text-transform: uppercase; color: var(--green); }
.tool-form.is-live .fields-cap { display: none; }
.field { display: grid; gap: 6px; align-content: start; min-width: 0; }
.field label { font-size: 0.9rem; font-weight: 600; line-height: 1.35; }
.field-box { display: flex; align-items: stretch; min-width: 0; border: 1px solid var(--ink-2); border-radius: 3px; background: var(--paper); }
.field-box:focus-within { outline: 2px solid var(--green); outline-offset: 1px; border-color: var(--green); }
.field-box input { flex: 1 1 auto; width: 100%; min-width: 0; font: inherit; font-size: 1rem; font-variant-numeric: tabular-nums; color: var(--ink); background: transparent; border: 0; border-radius: 3px; padding: 10px 12px; }
.field-box input:focus { outline: none; }
.field-box input::placeholder { color: var(--ink-2); opacity: .8; }
.field-box .unit { flex: none; display: flex; align-items: center; padding: 0 12px; font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink-2); background: var(--paper-2); border-left: 1px solid var(--rule); border-radius: 0 2px 2px 0; }
.field-hint { font-size: 0.84rem; line-height: 1.45; color: var(--ink-2); }
.field[data-state="warn"] .field-box { border-color: var(--grout); box-shadow: inset 3px 0 0 var(--grout); }
.field[data-state="error"] .field-box { border-color: var(--danger); box-shadow: inset 3px 0 0 var(--danger); }
.tool .chips { clear: none; }

/* results */
.tool-out { border: 1px solid var(--ink); background: var(--paper); display: grid; min-width: 0; }
.tool-out-h { font-family: var(--font-mono); font-size: 0.74rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; padding: 10px 16px; border-bottom: 1px solid var(--ink); }
.tool-live { display: grid; gap: 12px; padding: 4px 16px 16px; min-width: 0; }
.tool-live > [data-when] { display: grid; gap: 12px; min-width: 0; }
.res-h { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--green); padding-top: 12px; }
.res { margin: 0; display: grid; }
.res > div { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 14px; align-items: baseline; padding: 9px 0; border-bottom: 1px solid var(--rule); }
.res dt { font-size: 0.9rem; color: var(--ink-2); line-height: 1.35; }
.res dd { margin: 0; text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }
.res-unit { margin-left: 5px; font-family: var(--font-mono); font-size: 0.78rem; font-weight: 400; color: var(--ink-2); }
.res .res-main { grid-template-columns: minmax(0, 1fr); padding: 14px 0 12px; }
.res .res-main dd { text-align: left; white-space: normal; font-family: var(--font-display); font-weight: 750; font-size: clamp(2rem, 4.4vw, 2.8rem); line-height: 1; letter-spacing: -0.02em; }
.res .res-main .res-unit { font-family: var(--font-body); font-size: 0.42em; font-weight: 600; letter-spacing: 0; color: var(--ink-2); }
.res .res-text { grid-template-columns: minmax(0, 1fr); gap: 2px; }
.res .res-text dd { text-align: left; white-space: normal; }
.tool-live[data-state="error"] .res dd { color: var(--ink-2); }
.tool-msgs { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.tool-msgs li { border-left: 3px solid var(--grout); padding: 7px 10px; font-size: 0.9rem; line-height: 1.45; background: color-mix(in srgb, var(--grout) 9%, var(--paper)); }
.tool-msgs li.err { border-left-color: var(--danger); background: color-mix(in srgb, var(--danger) 8%, var(--paper)); }
.tool-work { font-family: var(--font-mono); font-size: 0.8rem; line-height: 1.6; color: var(--ink-2); white-space: pre-wrap; overflow-wrap: anywhere; }
.tool-extra { padding: 0 16px 16px; min-width: 0; }
.tool-actions { display: flex; flex-wrap: wrap; gap: 12px 22px; align-items: center; padding: 12px 16px 14px; border-top: 1px solid var(--rule); }

/* Lugeon classes */
.lu-table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }
.lu-table caption { text-align: left; padding-bottom: 6px; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2); }
.lu-table th, .lu-table td { padding: 7px 8px 7px 0; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.lu-table thead th { font-family: var(--font-mono); font-size: 0.68rem; font-weight: 500; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); border-bottom: 1px solid var(--ink); }
.lu-table tbody th { font-weight: 500; white-space: nowrap; font-variant-numeric: tabular-nums; }
.lu-table tr.on th, .lu-table tr.on td { background: color-mix(in srgb, var(--green-hi) 20%, transparent); font-weight: 600; }
.lu-table tr.on th { box-shadow: inset 3px 0 0 var(--green); padding-left: 8px; }
.lu-cite { margin-top: 8px; font-size: 0.8rem; color: var(--ink-2); }

/* the working: formula, symbols, assumptions */
.tool-how { margin-top: clamp(18px, 3vw, 28px); max-width: 900px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule); }
.tool-how summary { cursor: pointer; list-style: none; position: relative; padding: 14px 36px 14px 0; font-weight: 600; }
.tool-how summary::-webkit-details-marker { display: none; }
.tool-how summary::after { content: "+"; position: absolute; right: 6px; top: 10px; font-family: var(--font-mono); font-size: 1.3rem; color: var(--green); }
.tool-how[open] summary::after { content: "\2013"; }
.tool-how-body { display: grid; gap: 12px; padding: 0 0 20px; }
.tool-how h3 { font-size: 0.95rem; margin-top: 6px; }
.formula { display: grid; gap: 6px; padding: 12px 14px; font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.5; background: var(--paper-2); border: 1px solid var(--rule); border-radius: var(--radius); overflow-wrap: anywhere; }
.band .formula { background: var(--paper); }
.formula code { font-family: inherit; white-space: pre-wrap; }
.formula sub { font-size: 0.72em; }
.where { margin: 0; display: grid; gap: 6px; font-size: 0.9rem; }
.where > div { display: grid; grid-template-columns: minmax(48px, auto) minmax(0, 1fr); gap: 12px; }
.where dt { font-family: var(--font-mono); color: var(--ink); }
.where dd { margin: 0; color: var(--ink-2); }
.tool-how .ticks { gap: 8px; color: var(--ink-2); }

/* footing sketch */
.sketch { margin: 0; border: 1px solid var(--rule); background: var(--paper); }
.sketch svg { display: block; width: 100%; height: auto; }
.sketch figcaption { padding: 8px 12px; font-size: 0.82rem; color: var(--ink-2); border-top: 1px solid var(--rule); }
.sk-lbl { fill: var(--ink); font-family: var(--font-mono); font-size: 21px; font-style: italic; font-weight: 500; }
.sk-note { fill: var(--ink-2); font-family: var(--font-mono); font-size: 14px; letter-spacing: .04em; }

/* unit converter */
.conv { display: grid; gap: 20px; }
.conv-pair { display: grid; grid-template-columns: minmax(0, 1fr); gap: 6px; align-items: center; }
@media (min-width: 560px) { .conv-pair { grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 10px; } }
.conv-side { display: flex; min-width: 0; border: 1px solid var(--ink-2); border-radius: 3px; background: var(--paper); }
.conv-side:focus-within { outline: 2px solid var(--green); outline-offset: 1px; border-color: var(--green); }
.conv-side[data-state="error"] { border-color: var(--danger); box-shadow: inset 3px 0 0 var(--danger); }
.conv-side input { flex: 1 1 auto; width: 100%; min-width: 0; font: inherit; font-size: 1rem; font-variant-numeric: tabular-nums; color: var(--ink); background: transparent; border: 0; padding: 10px 12px; }
.conv-side input:focus, .conv-side select:focus { outline: none; }
.conv-side select { flex: 0 0 auto; width: 46%; max-width: 10.5em; font: inherit; font-size: 0.88rem; color: var(--ink); background: var(--paper-2); border: 0; border-left: 1px solid var(--rule); border-radius: 0 2px 2px 0; padding: 0 8px; cursor: pointer; }
.conv-eq { font-family: var(--font-mono); color: var(--ink-2); text-align: center; line-height: 1; }

/* ---------- calculator unlock: lock panel, the line under the title, the dialog ---------- */
.tool-lock { display: grid; gap: 14px; justify-items: start; padding: 16px; }
.tool-lock p { font-size: 0.95rem; line-height: 1.5; color: var(--ink-2); max-width: 46ch; }
.tool-lock p strong { color: var(--ink); font-weight: 600; }
.tools-gate { margin-top: 18px; display: grid; gap: 8px; justify-items: start; }
.tools-gate[hidden], .tools-gate [hidden] { display: none !important; }
.tools-gate-open { font-size: 0.92rem; color: var(--ink-2); }
.tools-gate-open strong { color: var(--ink); font-weight: 600; overflow-wrap: anywhere; }
.text-button { font: inherit; color: var(--green); background: none; border: 0; padding: 0; text-decoration: underline; text-underline-offset: 2px; cursor: pointer; }
.text-button:hover { color: var(--ink); }
dialog.gate { width: min(580px, calc(100% - 32px)); max-width: none; max-height: calc(100% - 32px); margin: auto; padding: 0; border: 0; background: transparent; color: var(--ink); overflow: auto; overscroll-behavior: contain; }
dialog.gate::backdrop { background: rgb(14 18 16 / .6); }
dialog.gate:not([open]) { display: none; }
dialog.gate.is-fallback { position: fixed; inset: 16px; z-index: 200; display: block; }
dialog.gate .gate-form { box-shadow: 0 18px 48px rgb(0 0 0 / .28); }
dialog.gate .gate-form[hidden] { display: none; }
.gate-x { position: absolute; top: 6px; right: 6px; z-index: 1; width: 44px; height: 44px; font: 400 1.7rem/1 var(--font-body); color: var(--ink-2); background: transparent; border: 0; border-radius: var(--radius); cursor: pointer; }
.gate-x:hover { color: var(--green); }
.gate-x:focus-visible { outline: 2px solid var(--green); outline-offset: -4px; }
.gate-head { display: grid; gap: 8px; padding-right: 40px; }
.gate-head h2 { font-size: clamp(1.35rem, 3vw, 1.7rem); line-height: 1.2; }
.gate-head p:last-child { color: var(--ink-2); font-size: 0.95rem; }
.gate-head strong { color: var(--ink); overflow-wrap: anywhere; }
.gate-form .actions { display: flex; flex-wrap: wrap; gap: 10px 14px; }
.gate-foot { display: grid; min-width: 0; }
.gate-foot .form-status:empty { padding: 0; border: 0; }
.gate-foot .form-status:not(:empty) { margin-top: 14px; }
.tools-gate-open:focus { outline: none; }
.tools-gate-open:focus-visible { outline: 2px solid var(--green); outline-offset: 4px; }
.gate-form input[name="code"] { font-family: var(--font-mono); font-size: 1.3rem; letter-spacing: .25em; max-width: 12em; }

/* ---------- print: inputs, results and the working, without the buttons ---------- */
@media print {
  .tool-actions, .tool button, .tool-jump, .tools-note, .tool-nojs, .tools-gate, .tool-lock, dialog.gate { display: none !important; }
  .tool { break-inside: avoid; padding-block: 14pt; }
  .tool-out { border-color: #000; }
  .tool-how { border-bottom: 0; }
  .tool-how summary::after { content: none; }
  details.tool-how::details-content { content-visibility: visible; display: block; }
  .field-box, .conv-side { border-color: #777; }
}