:root {
  --ink: #171c1f;
  --ink-soft: #232b2f;
  --ink-mute: #47535a;
  --slate: #63727a;
  --rule: #d5dcdf;
  --rule-soft: #e7ecee;
  --veil: #f4f7f8;
  --veil-deep: #eaeff1;
  --paper: #ffffff;
  --cyan-deep: #0a6c78;
  --cyan: #0f8fa3;
  --cyan-lit: #17b4cb;
  --cyan-wash: #e0f0f3;
  --shell: 1290px;
  --pad-section: clamp(3.25rem, 7vw, 6.25rem);
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-head: "Archivo", "Segoe UI", system-ui, sans-serif;
  --t-xs: 0.6875rem;
  --t-sm: 0.8125rem;
  --t-base: 0.9375rem;
  --t-lead: 1.0625rem;
  --t-h3: clamp(1.25rem, 2vw, 1.6rem);
  --t-h2: clamp(1.65rem, 3.6vw, 2.6rem);
  --t-h1: clamp(2rem, 5.4vw, 3.5rem);
  --radius: 2px;
  --radius-lg: 4px;
  --shadow-sheet: 0 1px 2px rgba(23, 28, 31, 0.06), 0 14px 34px -22px rgba(23, 28, 31, 0.4);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-mute);
  font-family: var(--font-body);
  font-size: var(--t-base);
  line-height: 1.68;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-head);
  color: var(--ink);
  margin: 0 0 0.5em;
  line-height: 1.14;
  letter-spacing: -0.015em;
  font-weight: 700;
}

h4 {
  font-size: var(--t-base);
  margin-top: 0;
}

p {
  margin: 0 0 1.05rem;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--cyan-deep);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

strong {
  color: var(--ink);
  font-weight: 700;
}

:focus-visible {
  outline: 3px solid var(--cyan-lit);
  outline-offset: 3px;
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 200;
  background: var(--cyan-deep);
  color: #fff;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius);
  font-weight: 600;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 1rem;
  text-decoration: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-head);
  font-size: var(--t-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.72rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  text-align: center;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn--lg {
  padding: 0.9rem 1.7rem;
  font-size: var(--t-base);
}

.btn--sm {
  padding: 0.5rem 0.95rem;
  font-size: var(--t-xs);
}

.btn--solid {
  background: var(--cyan-deep);
  color: #fff;
  border-color: var(--cyan-deep);
}

.btn--solid:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #fff;
}

.btn--line {
  background: transparent;
  color: var(--cyan-deep);
  border-color: var(--cyan-deep);
}

.btn--line:hover {
  background: var(--cyan-wash);
  color: var(--cyan-deep);
}

.topstrip {
  background: var(--ink-soft);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: var(--t-xs);
  color: rgba(255, 255, 255, 0.72);
}

.topstrip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1.5rem;
  padding-block: 0.5rem;
}

.topstrip__inner a,
.topstrip__inner span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}

.topstrip__inner a {
  color: rgba(255, 255, 255, 0.86);
}

.topstrip__inner a:hover {
  color: #fff;
}

.topstrip__inner i {
  color: var(--cyan-lit);
}

.masthead {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(23, 28, 31, 0.97);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 2vw, 2rem);
  min-height: 74px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: #fff;
  margin-right: auto;
  min-width: 0;
}

.brand:hover {
  text-decoration: none;
}

.brand__mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: var(--cyan-deep);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  flex: none;
}

.brand__mark i {
  font-size: 1.15rem;
  color: #fff;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.brand__text strong {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  color: #fff;
  letter-spacing: 0.01em;
}

.brand__text span {
  font-size: var(--t-xs);
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.56);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.15rem, 1.2vw, 1rem);
}

.nav__list a,
.nav__disclosure {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-head);
  font-size: var(--t-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  color: rgba(255, 255, 255, 0.82);
  background: none;
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
}

.nav__list a:hover,
.nav__disclosure:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.nav__item--menu {
  position: relative;
}

.nav__disclosure i {
  font-size: 0.7rem;
  transition: transform 0.18s var(--ease);
}

.nav__disclosure[aria-expanded="true"] i {
  transform: rotate(180deg);
}

.nav__sub {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 216px;
  background: var(--ink);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 2px solid var(--cyan);
  border-radius: var(--radius);
  padding: 0.4rem;
  box-shadow: var(--shadow-sheet);
}

.nav__sub a {
  display: block;
  padding: 0.55rem 0.7rem;
}

.masthead__cta {
  flex: none;
}

.burger {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  cursor: pointer;
  flex: none;
}

.burger__box {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 20px;
}

.burger__box span {
  height: 2px;
  background: #fff;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.burger[aria-expanded="true"] .burger__box span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger[aria-expanded="true"] .burger__box span:nth-child(2) {
  opacity: 0;
}

.burger[aria-expanded="true"] .burger__box span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.hero {
  position: relative;
  background: var(--ink);
  padding-block: clamp(2.75rem, 6vw, 4.75rem);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: center;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-head);
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-lit);
  border-left: 2px solid var(--cyan-lit);
  padding-left: 0.7rem;
  margin-bottom: 1.15rem;
  max-width: 100%;
}

.hero h1 {
  font-size: var(--t-h1);
  color: #fff;
  max-width: 22ch;
  margin-bottom: 1.15rem;
}

.hero__lede {
  max-width: 62ch;
  font-size: var(--t-lead);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 1.75rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.hero__actions .btn--line {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.hero__actions .btn--line:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.hero__ticks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.hero__ticks li {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--t-sm);
  color: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius);
  padding: 0.4rem 0.75rem;
}

.hero__ticks i {
  color: var(--cyan-lit);
}

.hero__media {
  margin: 0;
  min-width: 0;
}

.hero__caption {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-top: 0.7rem;
  font-size: var(--t-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
}

.hero__caption span {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--cyan-lit);
}

.hero__rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.16);
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
}

.hero__rail > div {
  background: var(--ink);
  padding: 0.85rem 1rem;
}

.hero__rail dt {
  font-size: var(--t-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
}

.hero__rail dd {
  margin: 0.2rem 0 0;
  font-family: var(--font-head);
  font-size: var(--t-sm);
  font-weight: 600;
  color: #fff;
  overflow-wrap: anywhere;
}

.hero__rail dd a {
  color: var(--cyan-lit);
}

.sec-index {
  font-family: var(--font-head);
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan-deep);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.sec-index::after {
  content: "";
  height: 1px;
  flex: 1;
  max-width: 120px;
  background: currentColor;
  opacity: 0.45;
}

.sec-head {
  max-width: 74ch;
  margin-bottom: clamp(1.75rem, 3vw, 2.75rem);
}

.sec-head h2 {
  font-size: var(--t-h2);
}

.sec-lede {
  font-size: var(--t-lead);
  color: var(--slate);
  margin: 0;
}

.tagrow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 1.35rem;
}

.tagrow li {
  font-family: var(--font-head);
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan-deep);
  background: var(--cyan-wash);
  border: 1px solid rgba(10, 108, 120, 0.22);
  border-radius: var(--radius);
  padding: 0.28rem 0.6rem;
}

.frame {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--veil-deep);
  aspect-ratio: 3 / 2;
}

.frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.frame--tall {
  aspect-ratio: 4 / 5;
}

.airflow__side {
  display: grid;
  gap: 1.25rem;
}

.explorer {
  padding-block: var(--pad-section);
  background: var(--paper);
  border-bottom: 1px solid var(--rule-soft);
}

.tabs__hint {
  display: none;
  font-family: var(--font-head);
  font-size: var(--t-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 0.75rem;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-bottom: 0;
}

.tab {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  min-width: 0;
  padding: 1.05rem 0.9rem 1.15rem;
  background: var(--veil);
  border: 0;
  border-top: 3px solid transparent;
  color: var(--ink-mute);
  font-family: var(--font-head);
  font-size: var(--t-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.tab__icon {
  width: 30px;
  height: 30px;
  font-size: 1.5rem;
  color: var(--cyan-deep);
  opacity: 0.85;
}

.tab__label {
  color: inherit;
}

.tab__num {
  font-size: var(--t-xs);
  letter-spacing: 0.14em;
  color: var(--slate);
  opacity: 0.8;
}

.tab:hover {
  background: var(--veil-deep);
  color: var(--ink);
}

.tab.is-active {
  background: var(--ink);
  border-top-color: var(--cyan-lit);
  color: #fff;
}

.tab.is-active .tab__icon {
  color: var(--cyan-lit);
  opacity: 1;
}

.tab.is-active .tab__num {
  color: var(--cyan-lit);
  opacity: 1;
}

.panels {
  min-width: 0;
}

.panel {
  border: 1px solid var(--rule);
  border-top: 0;
  background: var(--paper);
  padding: clamp(1.25rem, 3vw, 2.5rem);
}

.panel[hidden] {
  display: none;
}

.panel__body {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  align-items: start;
}

.panel__eyebrow {
  font-family: var(--font-head);
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-deep);
  margin-bottom: 0.5rem;
}

.panel h3 {
  font-size: var(--t-h3);
  margin-bottom: 0.85rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--rule-soft);
}

.panel__text > p:last-child {
  margin-bottom: 0;
}

.panel__faults h4 {
  font-family: var(--font-head);
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 0.85rem;
}

.signals {
  display: grid;
  gap: 0.6rem;
  counter-reset: signal;
}

.signals li {
  position: relative;
  padding: 0.7rem 0.9rem 0.7rem 2.6rem;
  background: var(--veil);
  border: 1px solid var(--rule-soft);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  font-size: var(--t-sm);
  line-height: 1.6;
}

.signals li::before {
  counter-increment: signal;
  content: counter(signal, decimal-leading-zero);
  position: absolute;
  left: 0.9rem;
  top: 0.72rem;
  font-family: var(--font-head);
  font-size: var(--t-xs);
  font-weight: 700;
  color: var(--cyan-deep);
  letter-spacing: 0.06em;
}

.service {
  padding-block: var(--pad-section);
  background: var(--veil);
}

.service--alt {
  background: var(--paper);
  border-block: 1px solid var(--rule-soft);
}

.service__grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.3fr);
  gap: clamp(1.5rem, 3.5vw, 3rem);
  align-items: start;
}

.service__grid--flip {
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
}

.service__grid--flip .service__lead {
  order: 2;
}

.service__grid--flip .service__cards {
  order: 1;
}

.service__lead h2 {
  font-size: var(--t-h2);
}

.service__cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.svc {
  background: var(--paper);
  padding: 1.35rem 1.3rem;
  display: flex;
  flex-direction: column;
}

.svc i {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: var(--cyan-wash);
  color: var(--cyan-deep);
  border: 1px solid rgba(10, 108, 120, 0.2);
  border-radius: var(--radius);
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}

.svc h3 {
  font-size: 1.02rem;
  margin-bottom: 0.4rem;
}

.svc p {
  margin: 0;
  font-size: var(--t-sm);
}

.heat__grid {
  display: block;
}

.heat__list {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.rowcard {
  background: var(--paper);
  padding: 1.2rem 1.4rem;
  display: grid;
  grid-template-columns: minmax(0, 15rem) minmax(0, 1fr);
  gap: 0.3rem clamp(1rem, 3vw, 2.5rem);
  align-items: start;
}

.rowcard h3 {
  font-size: 1.02rem;
  margin: 0;
}

.rowcard p {
  margin: 0;
  font-size: var(--t-sm);
}

.airflow {
  padding-block: var(--pad-section);
  background: var(--paper);
  border-bottom: 1px solid var(--rule-soft);
}

.airflow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}

.airflow__copy h2 {
  font-size: var(--t-h2);
}

.airflow__copy > p:last-child {
  margin-bottom: 0;
}

.checklist {
  display: grid;
  gap: 0.55rem;
}

.checklist li {
  position: relative;
  padding: 0.7rem 0.9rem 0.7rem 2.4rem;
  background: var(--veil);
  border: 1px solid var(--rule-soft);
  font-size: var(--t-sm);
  line-height: 1.6;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0.9rem;
  top: 0.95rem;
  width: 0.7rem;
  height: 0.35rem;
  border-left: 2px solid var(--cyan-deep);
  border-bottom: 2px solid var(--cyan-deep);
  transform: rotate(-45deg);
}

.checklist--tight li {
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule-soft);
  border-radius: 0;
  padding: 0.55rem 0 0.55rem 2.1rem;
}

.checklist--tight li::before {
  top: 0.85rem;
}

.callout {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  margin-top: 0;
  padding: 1rem 1.15rem;
  background: var(--cyan-wash);
  border: 1px solid rgba(10, 108, 120, 0.24);
  border-left: 3px solid var(--cyan-deep);
  border-radius: var(--radius);
}

.callout i {
  font-size: 1.35rem;
  color: var(--cyan-deep);
  flex: none;
  margin-top: 0.1rem;
}

.callout p {
  margin: 0;
  font-size: var(--t-sm);
  color: #0b4f58;
}

.maintain {
  padding-block: var(--pad-section);
  background: var(--ink);
}

.sec-head--dark h2 {
  color: #fff;
}

.sec-head--dark .sec-index {
  color: var(--cyan-lit);
}

.sec-head--dark .sec-lede {
  color: rgba(255, 255, 255, 0.72);
}

.maintain__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.task {
  background: var(--ink-soft);
  padding: 1.4rem 1.3rem;
}

.task__num {
  display: block;
  font-family: var(--font-head);
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cyan-lit);
  margin-bottom: 0.7rem;
}

.task h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 0.45rem;
}

.task p {
  margin: 0;
  font-size: var(--t-sm);
  color: rgba(255, 255, 255, 0.7);
}

.replace {
  padding-block: var(--pad-section);
  background: var(--paper);
}

.replace__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}

.replace__copy h2 {
  font-size: var(--t-h2);
}

.replace__copy h3 {
  font-size: var(--t-h3);
  margin-top: 1.75rem;
}

.replace__copy > p:last-child {
  margin-bottom: 1.5rem;
}

.replace__copy .checklist li {
  background: var(--paper);
  border-color: var(--rule);
}

.contact {
  padding-block: var(--pad-section);
  background: var(--veil);
  border-top: 1px solid var(--rule-soft);
}

.contact__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}

.contact__cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.ccard {
  background: var(--paper);
  padding: 1.4rem 1.3rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.ccard i {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: var(--cyan-wash);
  color: var(--cyan-deep);
  border: 1px solid rgba(10, 108, 120, 0.2);
  border-radius: var(--radius);
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}

.ccard h3 {
  font-size: 1.02rem;
  margin-bottom: 0.4rem;
}

.ccard p {
  margin: 0 0 0.5rem;
  font-size: var(--t-sm);
  overflow-wrap: anywhere;
}

.ccard__note {
  color: var(--slate);
}

.ccard .btn {
  margin-top: auto;
}

.contact__aside {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 1.9rem);
  box-shadow: var(--shadow-sheet);
}

.contact__prep h3 {
  font-size: var(--t-h3);
  margin-bottom: 1rem;
}

.contact__foot {
  margin: 1.2rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--rule-soft);
  font-size: var(--t-sm);
  color: var(--slate);
  overflow-wrap: anywhere;
}

.site-foot {
  background: var(--ink);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: clamp(2.25rem, 5vw, 3.5rem);
}

.site-foot__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.3fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.site-foot__brand .brand {
  margin-right: 0;
}

.site-foot__blurb {
  font-size: var(--t-sm);
  color: rgba(255, 255, 255, 0.66);
  margin: 1rem 0 0;
  max-width: 46ch;
}

.site-foot__head {
  font-family: var(--font-head);
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-lit);
  margin-bottom: 0.85rem;
}

.site-foot__col ul {
  display: grid;
  gap: 0.5rem;
}

.site-foot__col li,
.site-foot__col a {
  font-size: var(--t-sm);
  color: rgba(255, 255, 255, 0.76);
}

.site-foot__col a:hover {
  color: #fff;
}

.site-foot__contact li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  overflow-wrap: anywhere;
}

.site-foot__contact i {
  color: var(--cyan-lit);
  margin-top: 0.28rem;
  flex: none;
}

.site-foot__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: 1.4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.site-foot__base p {
  margin: 0;
  font-size: var(--t-xs);
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.55);
  max-width: 62ch;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (max-width: 1180px) {
  .site-foot__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1120px) {
  .tabs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .panel__body {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 980px) {
  html {
    scroll-padding-top: 78px;
  }

  .nav {
    display: none;
    width: 100%;
  }

  .masthead__cta {
    display: inline-flex;
    padding: 0.55rem 0.85rem;
    font-size: var(--t-xs);
  }

  .burger {
    display: inline-flex;
  }

  .masthead__inner {
    position: relative;
    flex-wrap: wrap;
    min-height: 64px;
  }

  .nav.is-open {
    display: block;
    padding-bottom: 1rem;
  }

  .nav.is-open .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
  }

  .nav.is-open .nav__list a,
  .nav.is-open .nav__disclosure {
    width: 100%;
    justify-content: space-between;
    padding: 0.75rem 0.6rem;
    font-size: var(--t-base);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav__sub {
    position: static;
    border: 0;
    border-left: 2px solid var(--cyan);
    border-radius: 0;
    box-shadow: none;
    padding: 0.25rem 0 0.25rem 0.75rem;
    min-width: 0;
    background: rgba(255, 255, 255, 0.04);
  }

  .hero__grid,
  .service__grid,
  .service__grid--flip,
  .airflow__grid,
  .replace__grid,
  .contact__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .service__grid--flip .service__lead,
  .service__grid--flip .service__cards {
    order: 0;
  }

  .frame--tall {
    aspect-ratio: 3 / 2;
  }

  .hero__rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .maintain__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .rowcard {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.35rem;
  }
}

@media (max-width: 720px) {
  .tabs__hint {
    display: block;
  }

  .tabs {
    display: flex;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }

  .tab {
    flex: 0 0 46%;
    min-width: 46%;
    scroll-snap-align: start;
  }

  .maintain__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .btn {
    width: 100%;
  }

  .masthead__cta {
    width: auto;
  }

  .hero__actions .btn {
    width: auto;
    flex: 1 1 200px;
  }

  .ccard .btn {
    width: auto;
  }
}

@media (max-width: 640px) {
  .topstrip__inner .topstrip__mail {
    display: none;
  }
}

@media (max-width: 600px) {
  .service__cards,
  .contact__cards {
    grid-template-columns: minmax(0, 1fr);
  }

  .site-foot__grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 520px) {
  .masthead__cta {
    display: none;
  }

  .hero__rail {
    grid-template-columns: minmax(0, 1fr);
  }

  .maintain__grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 420px) {
  .tab {
    flex: 0 0 62%;
    min-width: 62%;
  }
}

@media (max-width: 400px) {
  .masthead__inner {
    gap: 0.5rem;
  }

  .brand__mark {
    width: 32px;
    height: 32px;
  }

  .brand__text strong {
    font-size: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}