/* Cognitive AI Systems Limited — institutional holdco theme */

:root {
  --cas-ink: #12161a;
  --cas-ink-soft: #3d4650;
  --cas-mute: #6a7380;
  --cas-line: rgba(18, 22, 26, 0.12);
  --cas-field: #e8eef0;
  --cas-paper: #f4f6f7;
  --cas-deep: #0c1014;
  --cas-accent: #1a4f4a;
  --cas-accent-soft: #2a6b66;
  --cas-glow: rgba(26, 79, 74, 0.16);
  --cas-serif: "Instrument Serif", "Times New Roman", serif;
  --cas-sans: "Instrument Sans", "Helvetica Neue", sans-serif;
  --cas-max: 1120px;
  --cas-narrow: 40rem;
  --cas-radius: 4px;
}

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

html {
  scroll-behavior: smooth;
}

body.cas-holdco {
  margin: 0;
  min-height: 100vh;
  color: var(--cas-ink);
  background: var(--cas-paper);
  font-family: var(--cas-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
  overflow-x: clip;
}

body.cas-holdco a {
  color: inherit;
}

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

.cas-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--cas-deep);
  color: #fff;
  padding: 0.75rem 1rem;
  z-index: 100;
}

.cas-skip:focus {
  left: 1rem;
  top: 1rem;
}

.cas-atmosphere {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(1100px 560px at 8% -8%, var(--cas-glow), transparent 62%),
    radial-gradient(820px 480px at 100% 0%, rgba(18, 22, 26, 0.05), transparent 58%),
    linear-gradient(165deg, #fafbfc 0%, var(--cas-paper) 45%, #eef2f3 100%);
}

.cas-atmosphere::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 0%, transparent calc(50% - 1px), rgba(18, 22, 26, 0.035) 50%, transparent calc(50% + 1px), transparent 100%);
  opacity: 0.55;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 72%);
}

.cas-atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.cas-mast,
.cas-main,
.cas-foot {
  position: relative;
  z-index: 1;
}

.cas-wrap {
  width: min(100% - 2.75rem, var(--cas-max));
  margin-inline: auto;
}

.cas-mast {
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--cas-line);
  backdrop-filter: blur(12px);
  background: rgba(244, 246, 247, 0.78);
}

.cas-mast__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.cas-mast__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  min-width: 0;
}

.cas-mast__mark {
  color: var(--cas-accent);
  flex: 0 0 auto;
  display: grid;
  place-items: center;
}

.cas-mast__name {
  font-family: var(--cas-serif);
  font-size: clamp(1.02rem, 1.5vw, 1.25rem);
  letter-spacing: -0.01em;
  line-height: 1.2;
  white-space: normal;
}

.cas-mast__nav {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1rem, 2.5vw, 1.85rem);
  justify-content: flex-end;
}

.cas-mast__nav a {
  text-decoration: none;
  color: var(--cas-ink-soft);
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 0.15rem;
}

.cas-mast__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 280ms ease;
}

.cas-mast__nav a:hover::after,
.cas-mast__nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.cas-mast__nav a[aria-current="page"] {
  color: var(--cas-ink);
}

.cas-main {
  min-height: 64vh;
  padding-bottom: 5rem;
}

.cas-hero {
  padding: clamp(2.75rem, 7vh, 4.75rem) 0 clamp(2.75rem, 7vh, 4.5rem);
}

.cas-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(16rem, 0.75fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.cas-hero__grid > * {
  min-width: 0;
}

.cas-hero__copy {
  max-width: 40rem;
}

.cas-hero__line,
.cas-lede,
.cas-rail__value,
.cas-prose,
.cas-mast__name {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.cas-kicker {
  margin: 0 0 0.85rem;
  color: var(--cas-accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.cas-hero__title {
  margin: 0;
  font-family: var(--cas-serif);
  font-weight: 400;
  font-size: clamp(2.2rem, 5vw, 3.75rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  color: var(--cas-deep);
  max-width: 14ch;
}

.cas-hero__line {
  margin: 1.35rem 0 0;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--cas-ink);
  max-width: 28rem;
}

.cas-lede {
  margin: 1.15rem 0 0;
  max-width: 38rem;
  color: var(--cas-ink-soft);
  font-size: 1.05rem;
}

.cas-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 2.1rem;
}

.cas-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.7rem;
  padding: 0.62rem 1.2rem;
  border-radius: var(--cas-radius);
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: transform 220ms ease, background 220ms ease, color 220ms ease, border-color 220ms ease;
}

.cas-btn:hover {
  transform: translateY(-1px);
}

/* Must beat body.cas-holdco a { color: inherit } */
body.cas-holdco a.cas-btn--primary,
.cas-btn--primary {
  background: var(--cas-deep);
  color: #f7f8fa;
  border: 1px solid var(--cas-deep);
}

body.cas-holdco a.cas-btn--primary:hover,
.cas-btn--primary:hover {
  background: var(--cas-accent);
  border-color: var(--cas-accent);
  color: #f7f8fa;
}

body.cas-holdco a.cas-btn--ghost,
.cas-btn--ghost {
  background: rgba(255, 255, 255, 0.55);
  color: var(--cas-ink);
  border: 1px solid rgba(18, 22, 26, 0.18);
}

body.cas-holdco a.cas-btn--ghost:hover,
.cas-btn--ghost:hover {
  border-color: var(--cas-ink-soft);
  background: #fff;
}

.cas-rail {
  border-top: 1px solid var(--cas-line);
  padding-top: 1.35rem;
  display: grid;
  gap: 1.35rem;
}

.cas-rail__item {
  display: grid;
  gap: 0.3rem;
}

.cas-rail__label {
  color: var(--cas-mute);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.cas-rail__value {
  color: var(--cas-ink);
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.45;
}

.cas-section {
  padding: clamp(2.4rem, 5.5vh, 3.75rem) 0;
}

.cas-section--narrow > .cas-wrap {
  max-width: calc(var(--cas-narrow) + 2.75rem);
}

.cas-section--quiet {
  background: rgba(232, 238, 240, 0.45);
  border-block: 1px solid var(--cas-line);
}

.cas-display {
  margin: 0;
  font-family: var(--cas-serif);
  font-weight: 400;
  font-size: clamp(2.15rem, 4.4vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.cas-title {
  margin: 0;
  font-family: var(--cas-serif);
  font-weight: 400;
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.cas-split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}

.cas-prose {
  color: var(--cas-ink-soft);
}

.cas-prose p {
  margin: 0 0 1.05rem;
}

.cas-prose h2 {
  margin: 2rem 0 0.75rem;
  font-family: var(--cas-serif);
  font-size: 1.45rem;
  font-weight: 400;
  color: var(--cas-ink);
}

body.cas-holdco .cas-prose a {
  color: var(--cas-accent);
  text-underline-offset: 0.18em;
}

.cas-tri {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2rem);
}

.cas-tri article {
  padding: 0;
  border: 0;
  background: transparent;
}

.cas-card-title {
  margin: 0 0 0.55rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.cas-tri p {
  margin: 0;
  color: var(--cas-ink-soft);
  font-size: 0.98rem;
}

.cas-fact {
  display: grid;
  gap: 1.15rem;
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--cas-line);
}

.cas-fact > div {
  display: grid;
  grid-template-columns: 10rem minmax(0, 1fr);
  gap: 1rem;
}

.cas-fact__label {
  display: block;
  color: var(--cas-mute);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.cas-fact__value {
  color: var(--cas-ink);
  font-weight: 500;
}

body.cas-holdco .cas-fact__value a {
  color: var(--cas-accent);
}

.cas-contact {
  display: grid;
  gap: 1.9rem;
  padding-top: 0.35rem;
}

body.cas-holdco a.cas-contact__email,
.cas-contact__email {
  display: inline-block;
  margin-top: 0.4rem;
  font-family: var(--cas-serif);
  font-size: clamp(1.35rem, 2.4vw, 1.7rem);
  text-decoration: none;
  color: var(--cas-deep);
  letter-spacing: -0.02em;
}

body.cas-holdco a.cas-contact__email:hover {
  color: var(--cas-accent);
}

.cas-contact__office {
  margin: 0.4rem 0 0;
  color: var(--cas-ink-soft);
  line-height: 1.55;
}

.cas-note {
  margin-top: 2rem;
  color: var(--cas-mute);
  font-size: 0.92rem;
}

.cas-cta-line {
  margin-top: 2rem;
}

.cas-foot {
  border-top: 1px solid var(--cas-line);
  padding: 2.6rem 0 2rem;
  background: rgba(244, 246, 247, 0.9);
}

.cas-foot__grid {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.cas-foot__name {
  margin: 0;
  font-family: var(--cas-serif);
  font-size: 1.15rem;
}

.cas-foot__meta,
.cas-foot__office {
  margin: 0.4rem 0 0;
  color: var(--cas-mute);
  font-size: 0.88rem;
  max-width: 28rem;
}

.cas-foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.35rem;
  align-items: flex-start;
}

body.cas-holdco .cas-foot__links a {
  color: var(--cas-ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
}

body.cas-holdco .cas-foot__links a:hover {
  color: var(--cas-ink);
}

.cas-foot__base {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--cas-line);
  color: var(--cas-mute);
  font-size: 0.85rem;
}

.cas-foot__base p {
  margin: 0;
}

.cas-reveal {
  animation: cas-in 720ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.cas-hero.cas-reveal { animation-delay: 50ms; }
.cas-section.cas-reveal:nth-of-type(1) { animation-delay: 80ms; }
.cas-section.cas-reveal:nth-of-type(2) { animation-delay: 160ms; }
.cas-section.cas-reveal:nth-of-type(3) { animation-delay: 230ms; }

@keyframes cas-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 900px) {
  .cas-hero__grid,
  .cas-split,
  .cas-tri {
    grid-template-columns: 1fr;
  }

  .cas-hero__title {
    max-width: none;
  }

  .cas-rail {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    border-top: 0;
    border-left: 0;
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
  }

  .cas-fact > div {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

@media (max-width: 720px) {
  .cas-mast__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .cas-mast__nav {
    justify-content: flex-start;
  }

  .cas-rail {
    grid-template-columns: 1fr;
    border-top: 1px solid var(--cas-line);
    padding-top: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cas-reveal,
  .cas-btn,
  .cas-mast__nav a::after {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}