/* Shared interaction primitives. Keep page-specific composition in each page sheet. */
:root {
  --header-reserve: 11.125rem;
  --header-h: var(--header-reserve);
  /* Service's established feedback scale is an explicit exception to the body token. */
  --form-status-size: clamp(1.0625rem, .95rem + .4722vw, 1.375rem);
}

:focus-visible { outline-offset: 3px; }

/* The accepted editorial header shell: capped, fixed and self-inverting. */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-block-size: var(--header-reserve);
  max-inline-size: calc(1312px + 2 * var(--gutter));
  margin-inline: auto;
  padding-block: 24px;
  padding-inline: var(--gutter);
  color: #fff;
  background: transparent;
  mix-blend-mode: difference;
  pointer-events: none;
}
.site-header a, .site-header button { pointer-events: auto; }
.site-header :focus-visible { outline-color: currentColor; }
.site-header__logo img { filter: brightness(0) invert(1); }
.site-header__list { line-height: 20px; }
.site-header .menu-toggle { border-color: currentColor; }
.site-header .menu-toggle:active { background: #fff; color: var(--ink); }

/* Service control proportions are the shared Menu/Close rule. */
.menu-toggle {
  min-inline-size: 0;
  padding-block: 9px;
  padding-inline: 14px;
  font-size: 14px;
  font-weight: 400;
  line-height: 20px;
}
.menu-toggle:focus { outline: 2px solid transparent; }
.menu-toggle:focus-visible {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: .2em;
}

/* Homepage CTA system, including finite loading, press and reduced-motion behavior. */
.btn { border-color: var(--ink); }
.btn--primary, .btn--secondary { line-height: 22.1px; }
.btn--secondary { background: var(--paper); color: var(--ink); }
.btn--primary:active { background: var(--paper); color: var(--ink); }
.btn--secondary:active { background: var(--ink); color: var(--paper); }
.btn[disabled] { cursor: progress; opacity: .5; }
@media (hover: hover) and (pointer: fine) {
  .btn--primary:hover { background: var(--paper); color: var(--ink); }
  .btn--secondary:hover { background: var(--ink); color: var(--paper); }
}
@media (prefers-reduced-motion: no-preference) {
  .btn { transition: background-color 320ms var(--ease-out), color 320ms var(--ease-out); }
}
@media (prefers-reduced-motion: reduce) { .btn { transition: none; } }

/* The homepage underline treatment is shared by both pages. */
.text-link {
  padding-block-end: 2px;
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat;
  transition: background-size 320ms var(--ease-out);
}
@media (hover: hover) and (pointer: fine) {
  .text-link:hover { background-size: 100% 1px; text-decoration: none; }
}
@media (prefers-reduced-motion: reduce) { .text-link { transition: none; } }

/* Underline fields retain a visible forced-colors fallback. */
.field__input:focus {
  outline: 2px solid transparent;
  outline-offset: 3px;
  border-block-end-width: 2px;
  padding-block-end: 9px;
}
@media (forced-colors: active) {
  .field__input:focus-visible, .menu-toggle:focus-visible { outline-color: Highlight; }
}

.field__error { line-height: 21px; }

/* The service feedback rhythm is deliberate: near the action, before privacy text. */
.form__status { font-size: var(--form-status-size); line-height: 1.5; }
.form__status:empty { position: absolute; }
.form__submit:has(.form__status:not(:empty)) { row-gap: 0; }
.form__submit .form__status:not(:empty) { margin-block-end: 24px; }
.form__submit .form__copyright { margin-block-start: 4px; }
.form__submit:has(.form__status:not(:empty)) .form__copyright { margin-block-start: 20px; }
.form__note { font-size: 14px; line-height: 1.5; }

@media (max-width: 899px) {
  :root { --logo-size: 120px; --header-reserve: calc(40px + var(--logo-size) * 30 / 87); }
  .contact .container { gap: 32px; }
  .contact { row-gap: 32px; }
  .site-header { grid-template-columns: auto 1fr; padding-block: 20px; }
  .js .site-header__nav, .site-header__actions .text-link { display: none; }
  .site-header__logo { justify-self: start; }
  .js .site-header .menu-toggle { display: inline-flex; align-items: center; }
}

html:not(.js) .site-header {
  position: relative;
  color: var(--ink);
  background: var(--paper);
  mix-blend-mode: normal;
}
html:not(.js) .site-header__logo img { filter: none; }
@media (max-width: 899px) {
  html:not(.js) .site-header__nav { grid-column: 1 / -1; grid-row: 2; margin-block-start: 24px; }
  html:not(.js) .site-header__list { display: flex; flex-wrap: wrap; gap: 12px 24px; font-size: 16px; }
}