/* =============================================================
   Ultrasound Services Inc. — "Doppler"  (v4)
   Vanilla CSS. Zero build step. Design tokens under :root.

   The palette is a Doppler colour-flow map: petrol + aqua read
   as flow toward, coral as flow away. Fraunces is set light and
   large; Hanken Grotesk carries body and the uppercase labels.
   The signature is the slow flow field behind the hero and in
   the footer, plus the flow-line dividers between sections.
   See docs/superpowers/specs/2026-08-29-usi-v4-doppler-makeover.md
   ============================================================= */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 6rem; }
body {
  font-family: var(--font-body);
  font-size: var(--t-0);
  line-height: 1.62;
  color: var(--ink);
  background: var(--bone);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, picture, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
:where(ul, ol)[role="list"] { list-style: none; padding: 0; }
:target { scroll-margin-top: 7rem; }

/* ---------- Tokens ---------- */
:root {
  --flow-deep:  #08303f;
  --petrol:     #0c4860;
  --petrol-lift:#12566f;
  --violet:     #454574;
  --aqua:       #74cfc9;
  --aqua-lift:  #a7e6df;
  --coral:      #ff5a36;
  --coral-deep: #e8431f;

  --bone:   #f4f0e5;
  --bone-2: #ece3d1;
  --paper:  #fbf9f3;

  --ink:       #0e2c35;
  --haze:      #54707b;   /* muted on light  — 4.7:1 on bone */
  --aqua-haze: #9dbfc3;   /* muted on deep petrol */
  --line:      #ddd3bf;
  --line-dark: rgba(167, 230, 223, 0.16);

  --font-display: "Fraunces", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --font-body: "Hanken Grotesk", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* type scale */
  --t--2: clamp(0.72rem, 0.70rem + 0.10vw, 0.78rem);
  --t--1: clamp(0.84rem, 0.81rem + 0.16vw, 0.94rem);
  --t-0:  clamp(1rem, 0.96rem + 0.20vw, 1.12rem);
  --t-1:  clamp(1.18rem, 1.09rem + 0.42vw, 1.45rem);
  --t-2:  clamp(1.42rem, 1.24rem + 0.90vw, 2.05rem);
  --t-3:  clamp(1.9rem, 1.5rem + 1.9vw, 3.1rem);
  --t-4:  clamp(2.2rem, 1.7rem + 2.5vw, 4rem);
  --t-5:  clamp(2.35rem, 1.5rem + 4.2vw, 5.5rem);

  --pad: clamp(1.25rem, 0.6rem + 3vw, 2.5rem);
  --edge: clamp(1.25rem, 0.4rem + 4vw, 4rem);
  --bay: clamp(3.75rem, 2.6rem + 5vw, 7rem);   /* vertical section rhythm */

  --r-sm: 10px;
  --r: 16px;
  --r-lg: 24px;

  --flow: cubic-bezier(0.25, 1, 0.5, 1);     /* the project easing */
  --ease: cubic-bezier(0.4, 0.1, 0.2, 1);

  --sh-1: 0 2px 8px -3px rgba(8, 48, 63, 0.18);
  --sh-2: 0 18px 44px -22px rgba(8, 48, 63, 0.34);
  --sh-3: 0 40px 90px -40px rgba(8, 48, 63, 0.5);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 370;
  font-optical-sizing: auto;
  font-variation-settings: "SOFT" 40, "WONK" 0;
  line-height: 1.06;
  letter-spacing: -0.018em;
  text-wrap: balance;
  color: var(--ink);
}
h1 { font-size: var(--t-4); }
h2 { font-size: var(--t-3); }
h3 { font-size: var(--t-2); }
h4 { font-size: var(--t-1); }

.display { font-size: var(--t-5); line-height: 1.0; letter-spacing: -0.028em; font-weight: 340; }
em, .i {
  font-style: italic;
  font-variation-settings: "SOFT" 80, "WONK" 1;
}
.hung { display: block; color: var(--petrol); font-style: italic; font-variation-settings: "SOFT" 90, "WONK" 1; }

p { text-wrap: pretty; }
strong { font-weight: 600; color: var(--ink); }
.lead { font-size: var(--t-1); line-height: 1.5; color: var(--haze); max-width: 44ch; }

.eyebrow {
  display: flex; align-items: center; gap: 0.7rem; flex-wrap: wrap;
  font-family: var(--font-body);
  font-size: var(--t--2); font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--violet);
}
.eyebrow::before {
  content: ""; width: 1.9rem; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--aqua), var(--coral));
}

/* ---------- Layout ---------- */
.wrap { width: min(1240px, 100% - var(--edge) * 2); margin-inline: auto; }
.wrap--tight { width: min(880px, 100% - var(--edge) * 2); }

.bay { padding-block: var(--bay); position: relative; }
.bay--flush-top { padding-top: 0; }
.bay--tight { padding-block: clamp(2.75rem, 5vw, 4.25rem); }

.ground--bone2 { background: var(--bone-2); }
.ground--paper { background: var(--paper); }
.ground--petrol { background: var(--petrol); color: var(--bone); }
.ground--deep { background: var(--flow-deep); color: var(--bone); }
.ground--petrol :is(h1, h2, h3, h4),
.ground--deep :is(h1, h2, h3, h4) { color: var(--paper); }
.ground--petrol .hung, .ground--deep .hung { color: var(--aqua-lift); }
.ground--petrol .lead, .ground--deep .lead { color: var(--aqua-haze); }
.ground--petrol .eyebrow, .ground--deep .eyebrow { color: var(--aqua); }
.ground--petrol strong, .ground--deep strong { color: var(--paper); }

.section-head { display: grid; gap: 1rem; max-width: 54ch; margin-bottom: clamp(2rem, 4vw, 3rem); }
.section-head .lead { max-width: 48ch; }

/* ---------- Flow line (divider / signature) ---------- */
.flowline { position: relative; height: 2px; border: 0; overflow: hidden; background: var(--line); }
.flowline::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, var(--aqua) 30%, var(--coral) 55%, transparent 80%);
  background-size: 220% 100%;
  animation: flow-sheen 9s linear infinite;
}
.ground--petrol .flowline, .ground--deep .flowline { background: var(--line-dark); }
@keyframes flow-sheen { from { background-position: 120% 0; } to { background-position: -120% 0; } }

/* ---------- Flow field (signature, behind hero + footer) ----------
   A slow Doppler colour-flow wash: three blurred lobes — aqua (toward),
   coral (away), petrol (mid) — drifting on long offset cycles. On deep
   grounds they glow additively; on bone they're a soft tint. */
.flowfield {
  position: absolute; inset: 0; overflow: hidden; pointer-events: none; z-index: 0;
  --f-aqua: rgba(116, 207, 201, 0.16);
  --f-coral: rgba(255, 90, 54, 0.09);
  --f-petrol: rgba(18, 86, 111, 0.20);
  background:
    radial-gradient(58% 55% at 12% 4%,  var(--f-aqua),   transparent 72%),
    radial-gradient(50% 48% at 96% 22%, var(--f-coral),  transparent 68%),
    radial-gradient(60% 55% at 68% 108%, var(--f-petrol), transparent 72%);
}
.flowfield i {                     /* one slow-drifting lobe for ambient life */
  content: ""; position: absolute; width: 60vw; height: 60vw; left: 8vw; top: -24vw;
  border-radius: 50%; filter: blur(48px);
  background: radial-gradient(circle at 50% 50%, rgba(116, 207, 201, 0.14), transparent 62%);
  animation: drift-a 42s var(--ease) infinite alternate;
}
.ground--deep .flowfield, .ground--petrol .flowfield {
  --f-aqua: rgba(133, 224, 218, 0.30);
  --f-coral: rgba(255, 110, 74, 0.16);
  --f-petrol: rgba(60, 140, 168, 0.28);
}
.ground--deep .flowfield i, .ground--petrol .flowfield i {
  background: radial-gradient(circle at 50% 50%, rgba(133, 224, 218, 0.26), transparent 60%);
}
@keyframes drift-a { to { transform: translate3d(12vw, 9vw, 0) scale(1.2); } }
.flowfield ~ * { position: relative; z-index: 1; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  padding-block: 1.1rem;
  transform: translateY(0);
  transition: transform 0.45s var(--flow), padding 0.35s var(--ease), background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.site-header.is-scrolled {
  padding-block: 0.6rem;
  background: color-mix(in srgb, var(--bone) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.5);
  -webkit-backdrop-filter: blur(14px) saturate(1.5);
  box-shadow: 0 1px 0 var(--line), var(--sh-1);
}
.site-header.is-hidden { transform: translateY(-104%); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }

.brand { display: inline-flex; align-items: center; flex: none; }
.brand img { height: clamp(34px, 4.4vw, 44px); width: auto; }
.brand__light { display: none; }

.nav { display: flex; align-items: center; gap: clamp(1.3rem, 3vw, 2.5rem); }
.nav__link {
  font-size: var(--t--1); font-weight: 500; color: var(--haze);
  transition: color 0.25s var(--ease);
}
.nav__link:hover, .nav__link[aria-current="page"] { color: var(--ink); }

/* header sits over a dark hero / page-head until it's scrolled */
.site-header:not(.is-scrolled) .brand__dark { display: none; }
.site-header:not(.is-scrolled) .brand__light { display: block; }
.site-header:not(.is-scrolled) .nav__link { color: color-mix(in srgb, var(--bone) 78%, transparent); }
.site-header:not(.is-scrolled) .nav__link:hover,
.site-header:not(.is-scrolled) .nav__link[aria-current="page"] { color: #fff; }
.site-header:not(.is-scrolled) .nav-toggle { background: transparent; border-color: rgba(255, 255, 255, 0.32); }
.site-header:not(.is-scrolled) .nav-toggle span,
.site-header:not(.is-scrolled) .nav-toggle span::before,
.site-header:not(.is-scrolled) .nav-toggle span::after { background: var(--bone); }
body.nav-open .site-header .brand__dark { display: block; }
body.nav-open .site-header .brand__light { display: none; }
body.nav-open .site-header .nav-toggle span,
body.nav-open .site-header .nav-toggle span::before,
body.nav-open .site-header .nav-toggle span::after { background: var(--ink); }

/* dual-underline link: a faint hairline wipes out to the right as a coral
   line wipes in from the left; nothing shows at rest. */
.u-link { position: relative; display: inline-block; overflow: hidden; padding-bottom: 2px; }
.u-link::before, .u-link::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1.5px;
  transform: translateX(-101%);
  transition: transform 0.5s var(--flow);
}
.u-link::before { background: currentColor; opacity: 0.45; }
.u-link::after { background: var(--coral); }
.u-link:hover::before, .u-link:focus-visible::before { transform: translateX(101%); }
.u-link:hover::after, .u-link:focus-visible::after { transform: translateX(0); }
.nav__link[aria-current="page"]::after { transform: translateX(0); }

/* ---------- Nav dropdown (Services) ---------- */
.nav__item { position: relative; display: flex; align-items: center; }
.nav__item--has-menu > .nav__link { display: inline-flex; align-items: center; gap: 0.32rem; }
.nav__caret {
  width: 0.82em; height: 0.82em; flex: none;
  transition: transform 0.32s var(--flow);
}
.nav__item--has-menu:hover > .nav__link .nav__caret,
.nav__item--has-menu:focus-within > .nav__link .nav__caret,
.nav__item--has-menu.is-open > .nav__link .nav__caret { transform: rotate(180deg); }

/* hover bridge: keeps the menu open while the pointer travels the gap */
.nav__item--has-menu::after {
  content: ""; position: absolute; top: 100%; left: 0;
  width: 16rem; height: 0.75rem; pointer-events: none;
}
.nav__item--has-menu:hover::after,
.nav__item--has-menu:focus-within::after,
.nav__item--has-menu.is-open::after { pointer-events: auto; }

.nav__menu {
  position: absolute; top: 100%; left: 0; z-index: 1;
  margin-top: 0.7rem;
  display: grid; gap: 0.15rem;
  min-width: 16rem; max-width: calc(100vw - 2rem);
  padding: 0.5rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--sh-2);
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: translateY(6px);
  transition: opacity 0.26s var(--ease), transform 0.26s var(--flow), visibility 0.26s;
}
.nav__item--has-menu:hover > .nav__menu,
.nav__item--has-menu:focus-within > .nav__menu,
.nav__item--has-menu.is-open > .nav__menu {
  opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0);
}

.nav__menu-link {
  position: relative;
  display: block;
  padding: 0.62rem 0.8rem 0.62rem 0.95rem;
  border-radius: var(--r-sm);
  font-size: var(--t--1); font-weight: 500; line-height: 1.35;
  color: var(--haze);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.nav__menu-link::before {
  content: ""; position: absolute; left: 0.3rem; top: 50%;
  width: 2px; height: 0; border-radius: 2px;
  background: var(--coral); transform: translateY(-50%);
  transition: height 0.24s var(--flow);
}
.nav__menu-link:hover, .nav__menu-link:focus-visible {
  background: color-mix(in srgb, var(--petrol) 7%, transparent);
  color: var(--ink);
}
.nav__menu-link:hover::before, .nav__menu-link:focus-visible::before { height: 58%; }

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--petrol); --btn-fg: #fff; --btn-wipe: var(--petrol-lift);
  position: relative; display: inline-flex; align-items: center; gap: 0.55rem;
  padding: 0.95rem 1.55rem; border-radius: 100px;
  font-size: var(--t--1); font-weight: 600; letter-spacing: 0.005em;
  color: var(--btn-fg); background: var(--btn-bg);
  border: 1px solid transparent; cursor: pointer;
  overflow: hidden; isolation: isolate; white-space: nowrap;
  transition: box-shadow 0.35s var(--flow), color 0.3s var(--ease);
  will-change: transform;
}
.btn > * { position: relative; z-index: 1; }
.btn::after {
  content: ""; position: absolute; inset: 0; z-index: 0; background: var(--btn-wipe);
  clip-path: inset(0 100% 0 0);
  transition: clip-path 0.55s var(--flow);
}
.btn:hover::after, .btn:focus-visible::after { clip-path: inset(0 0 0 0); }
.btn:hover { box-shadow: var(--sh-2); }
.btn:active { transform: scale(0.97); }
.btn svg { width: 1.05em; height: 1.05em; transition: transform 0.35s var(--flow); }
.btn:hover svg { transform: translateX(4px); }

.btn--coral { --btn-bg: var(--coral); --btn-fg: #fff; --btn-wipe: var(--coral-deep); }
.btn--ghost {
  --btn-bg: transparent; --btn-fg: var(--ink); --btn-wipe: var(--ink);
  border-color: var(--line);
}
.btn--ghost:hover, .btn--ghost:focus-visible { color: #fff; }
.ground--petrol .btn--ghost, .ground--deep .btn--ghost { --btn-fg: var(--paper); --btn-wipe: var(--paper); border-color: var(--line-dark); }
.ground--petrol .btn--ghost:hover, .ground--deep .btn--ghost:hover { color: var(--petrol); }

.magnetic { display: inline-flex; transition: transform 0.5s var(--flow); will-change: transform; }

/* text link with arrow */
.arrow {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-weight: 600; font-size: var(--t--1); color: var(--petrol);
}
.arrow svg { width: 1em; height: 1em; transition: transform 0.3s var(--flow); }
.arrow:hover svg { transform: translateX(3px); }
.ground--petrol .arrow, .ground--deep .arrow { color: var(--aqua); }

/* ---------- Frames ---------- */
.frame { position: relative; border-radius: var(--r-lg); overflow: hidden; background: var(--bone-2); }
.frame img { width: 100%; height: 100%; object-fit: cover; }
.frame--tall { aspect-ratio: 4 / 5; }
.frame--wide { aspect-ratio: 16 / 10; }
.frame--photo::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, transparent 55%, rgba(8, 48, 63, 0.22));
  mix-blend-mode: multiply;
}
.ph {
  display: grid; place-items: center; color: var(--petrol);
  background: repeating-linear-gradient(135deg, var(--bone-2) 0 12px, color-mix(in srgb, var(--bone-2) 60%, var(--paper)) 12px 24px);
}
.ph svg { width: 22%; height: 22%; opacity: 0.4; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding-top: clamp(6.5rem, 7vh + 3rem, 9rem); padding-bottom: clamp(3rem, 7vw, 5rem);
  display: flex; align-items: center; min-height: min(80vh, 780px);
}
.hero > .wrap { width: min(1240px, 100% - var(--edge) * 2); }
.hero__grid {
  display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.8fr);
  gap: clamp(2rem, 5vw, 4.5rem); align-items: center;
}
.hero__grid > * { min-width: 0; }
.hero__title {
  font-size: var(--t-5); line-height: 1.0; letter-spacing: -0.028em;
  margin: 1.2rem 0 1.3rem; font-weight: 340;
  text-wrap: balance; overflow-wrap: break-word;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.hero__media { position: relative; }
.hero__media .frame { aspect-ratio: 3.6 / 4.4; box-shadow: var(--sh-3); }
.hero__media::before {
  content: ""; position: absolute; right: -1.3rem; bottom: -1.3rem; width: 58%; height: 58%;
  border: 2px solid var(--coral); border-radius: var(--r-lg); z-index: -1;
}
.hero__tag {
  position: absolute; left: -1.4rem; bottom: 2rem;
  display: flex; align-items: center; gap: 0.8rem;
  background: var(--paper); border-radius: var(--r-sm);
  box-shadow: var(--sh-2); padding: 0.8rem 1.1rem; max-width: 17rem;
}
.hero__tag svg { width: 1.5rem; height: 1.5rem; color: var(--petrol); flex: none; }
.hero__tag b { display: block; font-family: var(--font-display); font-weight: 400; font-size: var(--t--1); color: var(--ink); }
.hero__tag span { font-size: var(--t--2); line-height: 1.35; color: var(--haze); }

/* ---------- Clients strip ---------- */
.clients { display: grid; gap: 1.5rem; }
.clients__label {
  font-size: var(--t--2); letter-spacing: 0.16em; text-transform: uppercase;
  font-weight: 600; color: var(--haze); text-align: center;
}
.clients__row {
  display: flex; flex-wrap: wrap; align-items: stretch; justify-content: center;
  gap: clamp(0.6rem, 1.6vw, 1rem);
}
.clients__row li {
  flex: 1 1 150px; max-width: 220px;
  display: grid; place-items: center;
  padding: 1rem 1.3rem; border-radius: var(--r-sm);
  background: #fff; border: 1px solid var(--line);
}
.clients__row img {
  max-height: 34px; width: auto;
  filter: grayscale(1) opacity(0.62);
  transition: filter 0.35s var(--ease);
}
.clients__row li:hover img { filter: grayscale(0) opacity(1); }

/* ---------- Flow tabs (services explorer / who-we-serve) ---------- */
.flow-tabs { display: grid; gap: clamp(1.5rem, 3vw, 2.2rem); }
.flow-tabs__nav {
  position: relative; display: flex; gap: 0.25rem; width: fit-content; max-width: 100%;
  padding: 0.3rem; border-radius: 100px;
  background: color-mix(in srgb, var(--petrol) 8%, transparent);
  overflow-x: auto; scrollbar-width: none; scroll-snap-type: x proximity;
}
.flow-tabs__nav::-webkit-scrollbar { display: none; }
.ground--petrol .flow-tabs__nav, .ground--deep .flow-tabs__nav { background: rgba(255, 255, 255, 0.06); }
.flow-tabs__marker {
  position: absolute; z-index: 0; top: 0.3rem; bottom: 0.3rem; left: 0;
  border-radius: 100px; background: var(--paper); box-shadow: var(--sh-1);
  transform: translateX(0); width: 0;
  transition: transform 0.55s var(--flow), width 0.55s var(--flow);
}
.ground--petrol .flow-tabs__marker, .ground--deep .flow-tabs__marker { background: var(--aqua); }
.flow-tabs__tab {
  position: relative; z-index: 1; flex: 0 0 auto; scroll-snap-align: center;
  border: 0; background: transparent; cursor: pointer;
  padding: 0.7rem 1.2rem; border-radius: 100px;
  font-size: var(--t--1); font-weight: 600; color: var(--haze);
  white-space: nowrap; transition: color 0.3s var(--ease);
}
.flow-tabs__tab:hover { color: var(--ink); }
.flow-tabs__tab[aria-selected="true"] { color: var(--ink); }
.ground--petrol .flow-tabs__tab, .ground--deep .flow-tabs__tab { color: var(--aqua-haze); }
.ground--petrol .flow-tabs__tab:hover, .ground--deep .flow-tabs__tab:hover { color: var(--paper); }
.ground--petrol .flow-tabs__tab[aria-selected="true"], .ground--deep .flow-tabs__tab[aria-selected="true"] { color: var(--flow-deep); }

.flow-tabs__panel[hidden] { display: none; }
.flow-tabs__panel > * {
  opacity: 0; transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--flow);
  transition-delay: calc(var(--i, 0) * 65ms);
}
.flow-tabs__panel.is-active > * { opacity: 1; transform: none; }

.serve { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr); gap: clamp(1.5rem, 5vw, 4rem); align-items: stretch; }
.serve__body { align-self: center; }
.serve__body h3 { font-size: var(--t-3); margin-bottom: 0.8rem; }
.serve__body p { color: var(--haze); max-width: 42ch; margin-bottom: 1.4rem; font-size: var(--t-1); line-height: 1.5; }
.ground--petrol .serve__body p, .ground--deep .serve__body p { color: var(--aqua-haze); }
.serve .frame { height: 100%; min-height: 320px; box-shadow: var(--sh-3); }

.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.chip {
  font-size: var(--t--2); font-weight: 500;
  padding: 0.38rem 0.8rem; border-radius: 100px;
  border: 1px solid var(--line); color: var(--haze);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.chip:hover { border-color: var(--petrol); color: var(--petrol); }
.ground--petrol .chip, .ground--deep .chip { border-color: var(--line-dark); color: var(--aqua-haze); }
.ground--petrol .chip:hover, .ground--deep .chip:hover { border-color: var(--aqua); color: var(--aqua); }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1rem, 2.4vw, 1.5rem); }
.card {
  position: relative; display: grid; gap: 0.65rem; align-content: start;
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r); padding: clamp(1.4rem, 3vw, 1.9rem);
  overflow: hidden;
  transition: transform 0.4s var(--flow), box-shadow 0.4s var(--flow);
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--aqua), var(--coral));
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.45s var(--flow);
}
.card:hover { transform: translateY(-5px); box-shadow: var(--sh-2); }
.card:hover::before { transform: scaleX(1); }
.card__icon {
  width: 2.7rem; height: 2.7rem; border-radius: 12px;
  display: grid; place-items: center; margin-bottom: 0.2rem;
  background: color-mix(in srgb, var(--aqua) 24%, transparent); color: var(--petrol);
}
.card__icon svg { width: 1.35rem; height: 1.35rem; }
.card h3 { font-size: var(--t-1); }
.card p { color: var(--haze); font-size: var(--t--1); }
.ground--petrol .card, .ground--deep .card { background: rgba(255, 255, 255, 0.04); border-color: var(--line-dark); }
.ground--petrol .card p, .ground--deep .card p { color: var(--aqua-haze); }
.ground--petrol .card__icon, .ground--deep .card__icon { background: rgba(116, 207, 201, 0.16); color: var(--aqua); }

/* ---------- Stat band ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.stat { display: grid; gap: 0.5rem; padding-right: clamp(1rem, 2.5vw, 2rem); }
.stat + .stat { border-left: 1px solid var(--line); padding-left: clamp(1rem, 2.5vw, 2rem); }
.stat__n {
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(2.6rem, 1.9rem + 3vw, 4.2rem); line-height: 1; letter-spacing: -0.02em; color: var(--petrol);
}
.stat__n sup { font-size: 0.4em; color: var(--coral); top: -0.85em; margin-left: 0.02em; }
.stat__l { font-size: var(--t--1); color: var(--haze); max-width: 22ch; }
.ground--petrol .stat + .stat, .ground--deep .stat + .stat { border-color: var(--line-dark); }
.ground--petrol .stat__n, .ground--deep .stat__n { color: var(--aqua-lift); }
.ground--petrol .stat__l, .ground--deep .stat__l { color: var(--aqua-haze); }

/* ---------- Testimonials ---------- */
.quote-solo { max-width: 40ch; margin-inline: auto; text-align: center; display: grid; gap: 1.5rem; justify-items: center; }
.quote-solo .eyebrow::before { display: none; }
.quote-solo blockquote { font-family: var(--font-display); font-weight: 340; font-size: var(--t-2); line-height: 1.35; letter-spacing: -0.01em; }
.quote-solo blockquote::before { content: "\201C"; color: var(--coral); margin-right: 0.06em; }
.quote-solo cite { font-style: normal; font-weight: 600; font-size: var(--t--1); display: block; color: var(--paper); }
.quote-solo cite span { display: block; font-weight: 400; color: var(--aqua-haze); margin-top: 0.15rem; }

.quotes {
  display: flex; gap: clamp(1rem, 3vw, 1.6rem);
  overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none;
  margin-inline: calc(var(--edge) * -1); padding-inline: var(--edge); padding-bottom: 1rem;
}
.quotes::-webkit-scrollbar { display: none; }
.quotes__card {
  scroll-snap-align: start; flex: 0 0 min(480px, 82%);
  display: grid; gap: 1.3rem; align-content: space-between;
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r); padding: clamp(1.6rem, 4vw, 2.3rem);
}
.quotes__card blockquote { font-family: var(--font-display); font-weight: 360; font-size: var(--t-1); line-height: 1.4; }
.quotes__card figcaption { font-size: var(--t--1); font-weight: 600; }
.quotes__card figcaption span { display: block; font-weight: 400; color: var(--haze); }
.quotes-nav { display: flex; gap: 0.5rem; margin-top: 1.3rem; }
.quotes-nav button {
  width: 2.7rem; height: 2.7rem; border-radius: 50%;
  border: 1px solid var(--line); background: transparent; cursor: pointer;
  display: grid; place-items: center; color: var(--ink);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}
.quotes-nav button:hover { background: color-mix(in srgb, var(--petrol) 8%, transparent); border-color: var(--petrol); }
.quotes-nav svg { width: 1.05rem; height: 1.05rem; }

/* ---------- Stepper (How it works — order is real) ---------- */
.stepper { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr); gap: clamp(1.5rem, 4vw, 3.5rem); align-items: stretch; }
.steps { display: grid; align-content: center; align-self: center; }
.step {
  display: grid; grid-template-columns: auto 1fr; gap: 1.1rem;
  padding: 1.15rem 0; border-top: 1px solid var(--line);
  cursor: pointer; text-align: left; background: none; border-left: 0; border-right: 0; border-bottom: 0; width: 100%;
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step__n {
  width: 2.3rem; height: 2.3rem; border-radius: 50%; flex: none;
  display: grid; place-items: center;
  font-family: var(--font-display); font-size: 0.95rem; color: var(--haze);
  border: 1px solid var(--line); background: var(--paper);
  transition: background 0.35s var(--flow), color 0.35s var(--ease), border-color 0.35s var(--ease);
}
.step__body { display: block; }
.step__h { display: block; font-family: var(--font-display); font-size: var(--t-1); font-weight: 400; transition: color 0.25s var(--ease); }
.step__p {
  display: block; color: var(--haze); font-size: var(--t--1);
  max-height: 0; overflow: hidden; opacity: 0;
  transition: max-height 0.45s var(--flow), opacity 0.35s var(--ease), margin 0.45s var(--flow);
}
.step[aria-expanded="true"] .step__n { background: var(--petrol); color: #fff; border-color: var(--petrol); }
.step[aria-expanded="true"] .step__p { max-height: 9rem; opacity: 1; margin-top: 0.4rem; }
.step:hover .step__h { color: var(--petrol); }
.stepper .frame { height: 100%; min-height: 300px; box-shadow: var(--sh-2); }

/* ---------- Credentials grid (dark) ---------- */
.creds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line-dark); border: 1px solid var(--line-dark); border-radius: var(--r); overflow: hidden; }
.cred { background: var(--flow-deep); padding: clamp(1.5rem, 3vw, 2.1rem); display: grid; gap: 0.85rem; align-content: start; }
.cred__icon { width: 2.5rem; height: 2.5rem; border-radius: 10px; display: grid; place-items: center; background: rgba(116, 207, 201, 0.16); color: var(--aqua); }
.cred__icon svg { width: 1.3rem; height: 1.3rem; }
.cred h3 { font-size: var(--t-1); color: var(--paper); }
.cred ul { list-style: none; padding: 0; display: grid; gap: 0.5rem; }
.cred li { display: grid; grid-template-columns: auto 1fr; gap: 0.55rem; font-size: var(--t--1); color: var(--aqua-haze); }
.cred li svg { width: 0.95rem; height: 0.95rem; color: var(--aqua); margin-top: 0.3rem; flex: none; }

/* ---------- Differentiators ---------- */
.diffs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.diff { background: var(--paper); padding: clamp(1.5rem, 3.4vw, 2.2rem); display: grid; gap: 0.5rem; align-content: start; transition: background 0.3s var(--ease); }
.diff:hover { background: color-mix(in srgb, var(--aqua) 10%, var(--paper)); }
.diff__k { font-size: var(--t--2); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--coral); }
.diff h3 { font-size: var(--t-1); }
.diff p { font-size: var(--t--1); color: var(--haze); }

/* ---------- Prose / checklist ---------- */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.split--center { align-items: center; }
.prose { display: grid; gap: 1.1rem; max-width: 56ch; }
.prose p { color: var(--haze); }
.checklist { list-style: none; padding: 0; display: grid; gap: 0.95rem; }
.checklist li { display: grid; grid-template-columns: auto 1fr; gap: 0.85rem; font-size: var(--t--1); color: var(--haze); }
.checklist svg { width: 1.35rem; height: 1.35rem; color: var(--petrol); margin-top: 0.1rem; flex: none; }

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--line); }
.faq__item { border-bottom: 1px solid var(--line); }
.faq__q {
  width: 100%; text-align: left; border: 0; background: none; cursor: pointer;
  padding: 1.3rem 2.8rem 1.3rem 0; position: relative;
  font-family: var(--font-display); font-weight: 400; font-size: var(--t-1); color: var(--ink);
  transition: color 0.2s var(--ease);
}
.faq__q:hover { color: var(--petrol); }
.faq__q::after {
  content: ""; position: absolute; right: 0.3rem; top: 50%;
  width: 11px; height: 11px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: translateY(-65%) rotate(45deg); transition: transform 0.3s var(--flow);
}
.faq__item[data-open="true"] .faq__q::after { transform: translateY(-35%) rotate(-135deg); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height 0.4s var(--flow); }
.faq__a > div { padding: 0 2.8rem 1.4rem 0; color: var(--haze); font-size: var(--t--1); }

/* ---------- Team ---------- */
.team { display: flex; flex-wrap: wrap; gap: clamp(1.5rem, 2vw + 0.5rem, 2.6rem) clamp(1.5rem, 3vw, 3rem); }
.team-group { display: grid; gap: 1.3rem; }
.team-group__label { font-size: var(--t--2); font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--violet); }
.member { flex: 0 1 168px; display: grid; gap: 0.75rem; align-content: start; }
.member__photo { width: 100%; aspect-ratio: 1; border-radius: 50%; overflow: hidden; background: var(--paper); border: 1px solid var(--line); }
.member__photo img { width: 100%; height: 100%; object-fit: cover; }
.member__photo.ph { border-style: dashed; }
.member__photo .mono {
  width: 100%; height: 100%; display: grid; place-items: center;
  font-family: var(--font-display); font-size: 1.9rem; color: var(--petrol);
  background: color-mix(in srgb, var(--aqua) 16%, var(--paper));
}
.member h3 { font-size: var(--t-1); }
.member__role { font-size: var(--t--2); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--violet); margin-top: 0.15rem; }
.member p { font-size: var(--t--1); color: var(--haze); margin-top: 0.3rem; }
.team-sub { margin-top: clamp(2.5rem, 5vw, 3.5rem); }

/* ---------- Client wall ---------- */
.wall { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.wall li { background: var(--paper); padding: clamp(1.5rem, 3.5vw, 2.4rem) 1.2rem; display: grid; gap: 1rem; place-items: center; text-align: center; transition: background 0.25s var(--ease); }
.wall li:hover { background: color-mix(in srgb, var(--aqua) 9%, var(--paper)); }
.wall img { height: 34px; width: auto; filter: grayscale(1) opacity(0.7); transition: filter 0.3s var(--ease); }
.wall li:hover img { filter: grayscale(0) opacity(1); }
.wall span { font-size: var(--t--2); letter-spacing: 0.05em; color: var(--haze); }

/* ---------- Interior page head ---------- */
.page-head { position: relative; overflow: hidden; padding-top: clamp(8rem, 14vh, 10.5rem); padding-bottom: clamp(2.8rem, 5vw, 4.5rem); }
.page-head__inner { position: relative; z-index: 1; display: grid; gap: 1.1rem; max-width: 54ch; }
.page-head h1 { font-size: var(--t-4); max-width: 16ch; }

/* ---------- Forms ---------- */
.form { display: grid; gap: 1.2rem; }
.field { display: grid; gap: 0.4rem; }
.field--row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.field label { font-size: var(--t--2); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--haze); }
.field label .req { color: var(--coral); }
.field :is(input, select, textarea) {
  border: 1px solid var(--haze); background: #fff;
  border-radius: var(--r-sm); padding: 0.85rem 1rem; font-size: var(--t-0);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.field :is(input, select, textarea)::placeholder { color: color-mix(in srgb, var(--haze) 75%, transparent); }
.field textarea { resize: vertical; min-height: 130px; }
.field :is(input, select, textarea):focus-visible { outline: none; border-color: var(--petrol); box-shadow: 0 0 0 3px color-mix(in srgb, var(--petrol) 18%, transparent); }
.form__note { font-size: var(--t--2); color: var(--haze); }
.form__status { font-size: var(--t--1); padding: 0.9rem 1.1rem; border-radius: var(--r-sm); border: 1px solid var(--line); }
.form__status:empty { display: none; }
.form__status.is-ok { border-color: var(--petrol); background: color-mix(in srgb, var(--petrol) 10%, transparent); color: var(--petrol); }
.form__status.is-err { border-color: var(--coral); background: color-mix(in srgb, var(--coral) 9%, transparent); color: var(--coral-deep); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.contact-cards { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.contact-card { background: var(--paper); padding: 1.2rem 1.35rem; display: grid; gap: 0.25rem; }
.contact-card h4 { font-size: var(--t--2); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--haze); }
.contact-card :is(a, address) { font-style: normal; font-family: var(--font-display); font-size: var(--t-1); color: var(--ink); }

.map { border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; aspect-ratio: 16 / 10; filter: grayscale(0.5) contrast(1.03); transition: filter 0.5s var(--ease); }
.map:hover { filter: none; }
.map iframe { width: 100%; height: 100%; border: 0; }

.resource { display: grid; grid-template-columns: auto 1fr auto; gap: 1.4rem; align-items: center; border: 1px solid var(--line); border-radius: var(--r); padding: clamp(1.4rem, 3vw, 2rem); background: var(--paper); }
.resource__icon { width: 2.9rem; height: 2.9rem; border-radius: 12px; background: var(--flow-deep); color: var(--aqua); display: grid; place-items: center; flex: none; }
.resource__icon svg { width: 1.4rem; height: 1.4rem; }
.resource p { font-size: var(--t--1); color: var(--haze); }

/* ---------- CTA ---------- */
.cta { display: grid; gap: 1.5rem; max-width: 40ch; position: relative; z-index: 1; }

/* ---------- Footer ---------- */
.site-footer { position: relative; overflow: hidden; background: var(--flow-deep); color: var(--aqua-haze); }
.site-footer .wrap { position: relative; z-index: 1; }
.foot-cta { border-bottom: 1px solid var(--line-dark); padding-block: clamp(2.5rem, 5vw, 4rem); display: flex; flex-wrap: wrap; gap: 1.4rem 2rem; align-items: center; justify-content: space-between; }
.foot-cta h2 { font-size: var(--t-3); max-width: 18ch; color: var(--paper); }
.foot-grid { display: grid; grid-template-columns: 1.7fr repeat(3, 1fr); gap: clamp(1.6rem, 4vw, 3rem); padding-block: clamp(2.5rem, 5vw, 4rem); }
.foot-brand { display: grid; gap: 1rem; align-content: start; justify-items: start; }
.foot-brand p { font-size: var(--t--1); max-width: 30ch; }
.site-footer .brand__dark { display: none; }
.site-footer .brand__light { display: block; }
.foot-col h4 { font-size: var(--t--2); font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--aqua); margin-bottom: 1rem; }
.foot-col ul { list-style: none; padding: 0; display: grid; gap: 0.6rem; }
.foot-col :is(a, address) { font-style: normal; font-size: var(--t--1); color: var(--aqua-haze); transition: color 0.2s var(--ease); }
.foot-col a:hover { color: var(--paper); }
.foot-bottom { border-top: 1px solid var(--line-dark); padding-block: 1.4rem; display: flex; flex-wrap: wrap; gap: 0.7rem 2rem; align-items: center; justify-content: space-between; font-size: var(--t--2); }
.socials { display: flex; gap: 0.9rem; }
.socials a { color: var(--aqua-haze); }
.socials a:hover { color: var(--paper); }
.socials svg { width: 1.05rem; height: 1.05rem; }

/* ---------- Reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.8s var(--flow); }
[data-reveal].is-in { opacity: 1; transform: none; }
[data-stagger] > * { opacity: 0; transform: translateY(20px); transition: opacity 0.6s var(--ease), transform 0.7s var(--flow); transition-delay: calc(var(--i, 0) * 80ms); }
[data-stagger].is-in > * { opacity: 1; transform: none; }

/* ---------- Mobile nav ---------- */
.nav-toggle {
  display: none; width: 2.9rem; height: 2.9rem; flex: none;
  border: 1px solid var(--line); border-radius: 50%; background: var(--paper); cursor: pointer;
  position: relative; z-index: 120;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 50%; width: 16px; height: 2px; border-radius: 2px;
  background: var(--ink); transform: translateX(-50%); transition: transform 0.3s var(--flow), opacity 0.2s var(--ease);
}
.nav-toggle span { top: 50%; margin-top: -1px; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
body.nav-open .nav-toggle span { background: transparent; }
body.nav-open .nav-toggle span::before { transform: translateX(-50%) rotate(45deg); top: 0; }
body.nav-open .nav-toggle span::after { transform: translateX(-50%) rotate(-45deg); top: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__media { max-width: 26rem; }
  .serve, .stepper, .split { grid-template-columns: 1fr; }
  .cards, .diffs, .creds { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 2rem clamp(1.5rem, 4vw, 3rem); }
  .stat, .stat + .stat { border: 0; padding: 0; }
  .wall { grid-template-columns: repeat(3, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav { display: none; }
  .nav-toggle { display: block; }
  /* the fixed header carries a transform, which would otherwise trap the
     fixed overlay inside the header box — release it while the menu is open */
  body.nav-open .site-header { transform: none; }
  .site-nav {
    position: fixed; inset: 0; z-index: 110;
    display: grid !important; align-content: safe center; justify-items: start;
    gap: 0.6rem; padding: var(--edge); background: var(--bone);
    overflow-y: auto; overscroll-behavior: contain;
    transform: translateY(-100%); transition: transform 0.5s var(--flow);
  }
  body.nav-open .site-nav { transform: none; }
  .site-nav .nav__link { font-family: var(--font-display); font-size: var(--t-3); color: var(--ink); }
  /* beat the transparent-header link colour once the overlay (bone) is open */
  body.nav-open .site-header .nav__link,
  body.nav-open .site-header .nav__link:hover,
  body.nav-open .site-header .nav__link[aria-current="page"] { color: var(--ink); }
  .site-nav .btn { margin-top: 1rem; }

  /* Services group: no hover on touch, so the links sit open as an indented list */
  .site-nav .nav__item { display: grid; justify-items: start; gap: 0.35rem; width: 100%; }
  .site-nav .nav__caret,
  .site-nav .nav__item--has-menu::after { display: none; }
  .site-nav .nav__menu {
    position: static; margin: 0.1rem 0 0.3rem; padding: 0 0 0 0.95rem;
    min-width: 0; gap: 0.1rem;
    background: none; border: 0; border-left: 1px solid var(--line);
    border-radius: 0; box-shadow: none;
    opacity: 1; visibility: visible; pointer-events: auto; transform: none;
  }
  .site-nav .nav__menu-link { font-size: var(--t-0); padding: 0.5rem 0.2rem; color: var(--haze); }
  .site-nav .nav__menu-link::before { display: none; }
  .site-nav .nav__menu-link:hover, .site-nav .nav__menu-link:focus-visible { background: none; color: var(--ink); }
  .cards, .diffs, .creds, .stats, .wall, .field--row { grid-template-columns: 1fr; }
  .diffs, .creds { border-radius: var(--r); }
  .team { gap: 1.5rem; }
  .member { flex: 0 1 128px; }
  .hero__tag { position: static; margin-top: 1.2rem; max-width: none; }
  .hero__media { max-width: none; }
  .hero__media::before { display: none; }
  .hero__actions .btn { flex: 1 1 12rem; justify-content: center; }
  .eyebrow { letter-spacing: 0.1em; }
  .resource { grid-template-columns: 1fr; text-align: left; }
  .foot-grid { grid-template-columns: 1fr; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  [data-reveal], [data-stagger] > *, .flow-tabs__panel > * { opacity: 1 !important; transform: none !important; }
  .flowfield i { animation: none; } /* keep the static wash, drop the drift */
  .site-header.is-hidden { transform: none; }
}

/* ---------- Focus / a11y ---------- */
:focus-visible { outline: 2px solid var(--coral); outline-offset: 3px; border-radius: 3px; }
.ground--petrol :focus-visible, .ground--deep :focus-visible { outline-color: var(--aqua); }
::selection { background: var(--coral); color: #fff; }
.skip { position: absolute; left: 1rem; top: -120%; z-index: 200; background: var(--flow-deep); color: var(--paper); padding: 0.7rem 1.1rem; border-radius: 0 0 8px 8px; transition: top 0.2s var(--ease); }
.skip:focus { top: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }