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

html {
  background: var(--colour-canvas);
  scroll-behavior: smooth;
  scroll-padding-top: 6.5rem;
  scrollbar-color: var(--colour-border-strong) var(--colour-canvas);
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--colour-ink);
  background: var(--colour-canvas);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.is-locked {
  overflow: hidden;
}

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

img {
  height: auto;
}

button,
input,
textarea,
select {
  font: inherit;
}

input,
textarea,
select {
  border: 1px solid var(--colour-border-strong);
  border-radius: var(--radius-sm);
  color: var(--colour-ink);
  background: var(--colour-surface-raised);
}

input::placeholder,
textarea::placeholder {
  color: var(--colour-muted);
  opacity: 1;
}

input:disabled,
textarea:disabled,
select:disabled,
button:disabled,
[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
}

input[aria-invalid="true"],
textarea[aria-invalid="true"],
select[aria-invalid="true"] {
  border-color: var(--colour-invalid);
  background: var(--colour-invalid-soft);
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

p,
h1,
h2,
h3,
ul,
ol,
dl,
dd,
figure {
  margin-block-start: 0;
}

h1,
h2,
h3 {
  line-height: 1.04;
  text-wrap: balance;
}

h1,
h2,
h3,
p {
  margin-block-end: 0;
}

ul,
ol {
  padding-inline-start: 1.2rem;
}

::selection {
  color: var(--colour-accent-ink);
  background: var(--colour-accent);
}

:focus-visible {
  outline: 3px solid var(--colour-focus);
  outline-offset: 4px;
}

::-webkit-scrollbar {
  width: 0.75rem;
  height: 0.75rem;
}

::-webkit-scrollbar-track {
  background: var(--colour-canvas);
}

::-webkit-scrollbar-thumb {
  border: 0.2rem solid var(--colour-canvas);
  border-radius: 999px;
  background: var(--colour-border-strong);
}

[hidden] {
  display: none !important;
}

.shell,
.section-shell {
  width: min(100% - (2 * var(--gutter)), var(--shell));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-8);
}

.skip-link {
  position: fixed;
  z-index: 1000;
  inset: 0 auto auto var(--space-3);
  padding: 0.8rem 1rem;
  color: var(--colour-accent-ink);
  background: var(--colour-accent);
  font-weight: 700;
  transform: translateY(-130%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(var(--space-3));
}

.scroll-progress {
  position: fixed;
  z-index: 110;
  inset: 0 0 auto;
  height: 3px;
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--colour-accent);
  transform: scaleX(0);
  transform-origin: left center;
}

.eyebrow {
  color: var(--colour-muted);
  font-size: var(--step--1);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-heading {
  max-width: 59rem;
  margin-bottom: clamp(3rem, 6vw, 5.2rem);
}

.section-heading h2 {
  max-width: 17ch;
  margin-top: var(--space-3);
  font-size: var(--step-4);
  letter-spacing: -0.045em;
}

.section-heading h2 em,
.about-copy h2 em,
.contact-panel h2 em {
  font-family: var(--font-serif);
  font-weight: 400;
}

.section-heading--split {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(17rem, 0.65fr);
  gap: var(--space-6);
  max-width: none;
  align-items: end;
}

.section-heading--split > p {
  max-width: 39rem;
  color: var(--colour-muted);
}

.theme-ready body,
.theme-ready :where(.header-inner, .mobile-menu, .hero-composition, .interface-window, .capability-strip, .expertise, .experience, .about, .contact, .site-footer, .error-card, input, textarea, select) {
  transition: color var(--transition-theme), background-color var(--transition-theme), border-color var(--transition-theme), box-shadow var(--transition-theme);
}

.reveal {
  transition: opacity 600ms ease, transform 600ms cubic-bezier(0.22, 1, 0.36, 1);
}

.js .reveal:not(.is-visible) {
  opacity: 0;
  transform: translateY(1.4rem);
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js .reveal:not(.is-visible) {
    opacity: 1;
    transform: none;
  }
}