/* CYAN LTD — brand colour as architecture */

:root {
  --cyan: #06b6d4;
  --navy: #083344;
  --white: #ffffff;
  --ink: #04151c;
  --muted: #4a6670;
  --font-display: "Red Hat Display", sans-serif;
  --font-text: "Red Hat Text", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --pad: clamp(1.25rem, 4vw, 4rem);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-text);
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--white);
  overflow-x: hidden;
}

body.is-nav-open {
  overflow: hidden;
}

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

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

address {
  font-style: normal;
}

/* Fixed corner chrome */

.wordmark {
  position: fixed;
  top: 1.1rem;
  left: 1.1rem;
  z-index: 1000;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  text-decoration: none;
  color: var(--ink);
  mix-blend-mode: difference;
  color: var(--white);
}

.menu-toggle {
  position: fixed;
  top: 0.85rem;
  right: 1rem;
  z-index: 1001;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 0.55rem 0.75rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  mix-blend-mode: difference;
  color: var(--white);
}

.menu-toggle:focus-visible,
.overlay-nav a:focus-visible,
.hero__cta:focus-visible,
.contact__form button:focus-visible,
.glossary:focus-visible {
  outline: 2px solid var(--white);
  outline-offset: 3px;
}

/* Fullscreen cyan overlay nav */

.overlay-nav {
  position: fixed;
  inset: 0;
  z-index: 900;
  background: var(--cyan);
  color: var(--ink);
  transform: translateY(-101%);
  transition: transform 0.55s var(--ease);
  display: grid;
  align-items: end;
  padding: var(--pad);
  padding-top: 5rem;
}

.overlay-nav.is-open {
  transform: translateY(0);
}

.overlay-nav__inner {
  width: min(1100px, 100%);
}

.overlay-nav__kicker {
  margin: 0 0 1.5rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 700;
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity 0.4s ease, transform 0.4s var(--ease);
}

.overlay-nav.is-open .overlay-nav__kicker {
  opacity: 1;
  transform: none;
  transition-delay: 0.15s;
}

.overlay-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.overlay-nav__list li {
  border-top: 1px solid rgba(4, 21, 28, 0.18);
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.4s ease, transform 0.45s var(--ease);
}

.overlay-nav.is-open .overlay-nav__list li {
  opacity: 1;
  transform: none;
}

.overlay-nav.is-open .overlay-nav__list li:nth-child(1) { transition-delay: 0.12s; }
.overlay-nav.is-open .overlay-nav__list li:nth-child(2) { transition-delay: 0.16s; }
.overlay-nav.is-open .overlay-nav__list li:nth-child(3) { transition-delay: 0.2s; }
.overlay-nav.is-open .overlay-nav__list li:nth-child(4) { transition-delay: 0.24s; }
.overlay-nav.is-open .overlay-nav__list li:nth-child(5) { transition-delay: 0.28s; }
.overlay-nav.is-open .overlay-nav__list li:nth-child(6) { transition-delay: 0.32s; }
.overlay-nav.is-open .overlay-nav__list li:nth-child(7) { transition-delay: 0.36s; }
.overlay-nav.is-open .overlay-nav__list li:nth-child(8) { transition-delay: 0.4s; }

.overlay-nav__list a {
  display: block;
  padding: 0.65rem 0;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  transition: padding-left 0.25s var(--ease), color 0.2s ease;
}

.overlay-nav__list a:hover {
  padding-left: 0.75rem;
  color: var(--white);
}

.overlay-nav__list li:last-child {
  border-bottom: 1px solid rgba(4, 21, 28, 0.18);
}

.overlay-nav__meta {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  font-size: 0.95rem;
  opacity: 0;
  transition: opacity 0.4s ease 0.45s;
}

.overlay-nav.is-open .overlay-nav__meta {
  opacity: 1;
}

.overlay-nav__meta a {
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Bands */

.band {
  position: relative;
  padding: clamp(4rem, 10vw, 8rem) var(--pad);
  overflow: hidden;
}

.band--cyan {
  background: var(--cyan);
  color: var(--ink);
}

.band--navy {
  background: var(--navy);
  color: var(--white);
}

.band--white {
  background: var(--white);
  color: var(--ink);
}

.band__label {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.band__label--ink {
  color: var(--ink);
}

.band__label--muted {
  color: var(--muted);
}

.band__title {
  margin: 0 0 1.5rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8vw, 5.5rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  max-width: 14ch;
}

.band__title--ink {
  color: var(--ink);
}

.band__lede {
  max-width: 38rem;
  margin: 0 0 2rem;
  font-size: 1.1rem;
}

.band[data-band] .band__title,
.band[data-band] .band__lede,
.band[data-band] .band__label,
.band[data-band] .signal__list,
.band[data-band] .systems__body,
.band[data-band] .craft__manifesto,
.band[data-band] .partners__list,
.band[data-band] .corsham__copy,
.band[data-band] .notes__grid,
.band[data-band] .glossary,
.band[data-band] .contact,
.band[data-band] .corsham__stat,
.band[data-band] .signal__numbers {
  opacity: 0;
  transform: translateY(2.5rem);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.band.is-inview .band__title,
.band.is-inview .band__lede,
.band.is-inview .band__label,
.band.is-inview .signal__list,
.band.is-inview .systems__body,
.band.is-inview .craft__manifesto,
.band.is-inview .partners__list,
.band.is-inview .corsham__copy,
.band.is-inview .notes__grid,
.band.is-inview .glossary,
.band.is-inview .contact,
.band.is-inview .corsham__stat,
.band.is-inview .signal__numbers {
  opacity: 1;
  transform: none;
}

.band.is-inview .band__lede { transition-delay: 0.08s; }
.band.is-inview .signal__list,
.band.is-inview .systems__body,
.band.is-inview .craft__manifesto,
.band.is-inview .partners__list,
.band.is-inview .corsham__copy,
.band.is-inview .notes__grid,
.band.is-inview .glossary,
.band.is-inview .contact { transition-delay: 0.14s; }

/* Hero */

.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  background: var(--cyan);
  color: var(--ink);
  padding-bottom: clamp(3rem, 8vw, 5.5rem);
}

.hero__frame {
  width: min(1200px, 100%);
}

.hero__eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.hero__brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(4.2rem, 18vw, 13rem);
  line-height: 0.85;
  letter-spacing: -0.055em;
}

.hero__manifesto {
  margin: 1.5rem 0 2rem;
  max-width: 34rem;
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  font-weight: 500;
}

.hero__cta {
  display: inline-block;
  padding: 0.95rem 1.6rem;
  background: var(--ink);
  color: var(--cyan);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.85rem;
  transition: transform 0.25s var(--ease), background 0.2s ease, color 0.2s ease;
}

.hero__cta:hover {
  transform: translateY(-2px);
  background: var(--navy);
  color: var(--white);
}

.hero[data-band] .hero__eyebrow,
.hero[data-band] .hero__brand,
.hero[data-band] .hero__manifesto,
.hero[data-band] .hero__cta {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.hero.is-inview .hero__eyebrow,
.hero.is-inview .hero__brand,
.hero.is-inview .hero__manifesto,
.hero.is-inview .hero__cta {
  opacity: 1;
  transform: none;
}

.hero.is-inview .hero__brand { transition-delay: 0.08s; }
.hero.is-inview .hero__manifesto { transition-delay: 0.16s; }
.hero.is-inview .hero__cta { transition-delay: 0.24s; }

/* Signal */

.signal {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: end;
}

@media (min-width: 900px) {
  .signal {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 3rem;
  }
}

.signal__numbers {
  display: flex;
  flex-direction: column;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(5rem, 18vw, 12rem);
  line-height: 0.8;
  letter-spacing: -0.06em;
  color: rgba(255, 255, 255, 0.12);
  user-select: none;
}

.signal__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.signal__list li {
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  max-width: 36rem;
}

.signal__list strong {
  display: block;
  font-family: var(--font-display);
  margin-bottom: 0.25rem;
  letter-spacing: -0.01em;
}

/* Systems + marquee */

.systems__title {
  max-width: 16ch;
}

.marquee {
  margin: 2.5rem calc(var(--pad) * -1) 2.5rem;
  overflow: hidden;
  border-block: 2px solid var(--ink);
  background: rgba(4, 21, 28, 0.06);
  padding: 1rem 0;
}

.marquee__track {
  display: flex;
  width: max-content;
  gap: 1.25rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.75rem);
  letter-spacing: -0.03em;
  text-transform: uppercase;
  white-space: nowrap;
  animation: marquee 32s linear infinite;
  color: var(--ink);
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.systems__body {
  display: grid;
  gap: 1.25rem;
  max-width: 48rem;
}

.systems__body p {
  margin: 0;
  font-size: 1.08rem;
}

/* Craft */

.craft {
  max-width: 42rem;
  margin-inline: auto;
}

.craft__title {
  max-width: 12ch;
}

.craft__manifesto p {
  margin: 0 0 1.4rem;
  font-size: 1.15rem;
}

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

/* Partners */

.partners {
  display: grid;
  gap: 3rem;
}

@media (min-width: 900px) {
  .partners {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }
}

.partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.partners__list li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding: 1.05rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  letter-spacing: -0.02em;
}

.partners__list li:first-child {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.partners__index {
  font-weight: 900;
  color: var(--cyan);
}

/* Corsham */

.corsham {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 800px) {
  .corsham {
    grid-template-columns: auto 1fr;
    gap: 3rem;
  }
}

.corsham__stat {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(8rem, 28vw, 18rem);
  line-height: 0.75;
  letter-spacing: -0.07em;
  color: var(--ink);
  opacity: 0.35;
}

.corsham__copy p {
  max-width: 38rem;
}

.corsham__address {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.45;
}

.corsham__address a {
  color: var(--ink);
  font-weight: 700;
}

/* Field notes */

.notes__grid {
  display: grid;
  gap: 0;
  margin-top: 2.5rem;
  border-top: 1px solid rgba(8, 51, 68, 0.2);
}

@media (min-width: 800px) {
  .notes__grid {
    grid-template-columns: 1fr 1fr;
  }
}

.notes__item {
  padding: 1.75rem 0;
  border-bottom: 1px solid rgba(8, 51, 68, 0.2);
}

@media (min-width: 800px) {
  .notes__item:nth-child(odd) {
    padding-right: 1.75rem;
    border-right: 1px solid rgba(8, 51, 68, 0.2);
  }

  .notes__item:nth-child(even) {
    padding-left: 1.75rem;
  }
}

.notes__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 2.5rem;
  letter-spacing: -0.04em;
  color: var(--cyan);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.notes__item h3 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.notes__item p {
  margin: 0;
  color: var(--muted);
}

/* Cyan index glossary */

.index-head {
  margin-bottom: 2rem;
}

.glossary {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 1.25rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--cyan) rgba(255, 255, 255, 0.08);
}

.glossary__item {
  flex: 0 0 min(78vw, 220px);
  scroll-snap-align: start;
  min-height: 260px;
  padding: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(0, 0, 0, 0.12);
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s var(--ease);
}

.glossary__item:hover,
.glossary__item:focus-within {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  transform: translateY(-6px);
}

.glossary__letter {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 3.5rem;
  line-height: 1;
  letter-spacing: -0.05em;
  margin-bottom: 1rem;
  transition: color 0.25s ease;
}

.glossary__item:hover .glossary__letter,
.glossary__item:focus-within .glossary__letter {
  color: var(--white);
}

.glossary__item h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
}

.glossary__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.45;
  opacity: 0.9;
}

/* Contact split */

.band--contact {
  padding: 0;
  background: var(--navy);
}

.contact {
  display: grid;
  min-height: min(90vh, 820px);
}

@media (min-width: 860px) {
  .contact {
    grid-template-columns: 1fr 1fr;
  }
}

.contact__cyan,
.contact__navy {
  padding: clamp(3rem, 8vw, 5.5rem) var(--pad);
}

.contact__cyan {
  background: var(--cyan);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.contact__navy {
  background: var(--navy);
  color: var(--white);
  display: flex;
  align-items: center;
}

.contact__lede {
  max-width: 28rem;
  margin: 0 0 2rem;
}

.contact__direct {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
}

.contact__direct a {
  font-size: 1.25rem;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.contact__address {
  margin: 0;
  font-size: 0.95rem;
}

.contact__form {
  width: min(420px, 100%);
  display: grid;
  gap: 1rem;
}

.contact__form label {
  display: grid;
  gap: 0.4rem;
}

.contact__form label span {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.contact__form input,
.contact__form textarea {
  width: 100%;
  border: 0;
  border-bottom: 2px solid rgba(255, 255, 255, 0.35);
  background: transparent;
  color: var(--white);
  padding: 0.65rem 0;
  border-radius: 0;
  resize: vertical;
}

.contact__form input:focus,
.contact__form textarea:focus {
  outline: none;
  border-bottom-color: var(--cyan);
}

.contact__form button {
  margin-top: 0.75rem;
  border: 0;
  cursor: pointer;
  padding: 1rem 1.25rem;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.85rem;
  transition: transform 0.25s var(--ease), background 0.2s ease;
}

.contact__form button:hover {
  transform: translateY(-2px);
  background: var(--white);
}

.contact__status {
  min-height: 1.4em;
  margin: 0.25rem 0 0;
  font-size: 0.95rem;
  color: var(--cyan);
}

.contact__status.is-error {
  color: #fda4af;
}

/* Footer */

.footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.72);
  padding: 1.75rem var(--pad);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  font-size: 0.9rem;
}

.footer__brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: 0.16em;
  color: var(--cyan);
  font-size: 0.85rem;
}

.footer__meta,
.footer__copy {
  margin: 0;
}

.footer a {
  color: var(--white);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

  .overlay-nav,
  .overlay-nav__kicker,
  .overlay-nav__list li,
  .overlay-nav__meta,
  .band[data-band] .band__title,
  .band[data-band] .band__lede,
  .band[data-band] .band__label,
  .band[data-band] .signal__list,
  .band[data-band] .systems__body,
  .band[data-band] .craft__manifesto,
  .band[data-band] .partners__list,
  .band[data-band] .corsham__copy,
  .band[data-band] .notes__grid,
  .band[data-band] .glossary,
  .band[data-band] .contact,
  .band[data-band] .corsham__stat,
  .band[data-band] .signal__numbers,
  .hero[data-band] .hero__eyebrow,
  .hero[data-band] .hero__brand,
  .hero[data-band] .hero__manifesto,
  .hero[data-band] .hero__cta,
  .glossary__item,
  .hero__cta,
  .contact__form button {
    transition: none;
  }

  .marquee__track {
    animation: none;
  }
}