/* ==========================================================================
   UHBC — Components
   ========================================================================== */

/* --- Curtain (intro + page transitions) --------------------------------- */

.curtain {
  display: none;
}

.js .curtain {
  position: fixed;
  inset: 0;
  z-index: var(--z-curtain);
  display: grid;
  place-items: center;
  background: var(--c-ink);
  color: var(--c-paper);
  will-change: transform;
}

.js.is-failsafe .curtain {
  transform: translateY(-100%);
  visibility: hidden;
  transition: transform 0.9s var(--ease-in-out), visibility 0s 0.9s;
}

/* After the first page of a visit the curtain is a plain wipe, not a loader. */
.is-return .curtain__inner {
  visibility: hidden;
}

.curtain__inner {
  display: grid;
  justify-items: center;
  gap: 1.25rem;
  padding: var(--gutter);
  text-align: center;
}

.curtain__label {
  font-family: var(--f-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.curtain__label--muted {
  color: rgba(247, 247, 244, 0.5);
}

.curtain__line {
  position: relative;
  width: min(14rem, 50vw);
  height: 1px;
  background: rgba(247, 247, 244, 0.18);
  overflow: hidden;
}

.curtain__line span {
  position: absolute;
  inset: 0;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
}

/* --- Header ------------------------------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-header);
  height: var(--header-h);
  transition: transform 0.7s var(--ease-expo);
}

/* Always solid, so links never sit over page content; the hairline appears once scrolled. */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--c-paper);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease-out), opacity 0.4s var(--ease-out);
}

.site-header.is-scrolled::before {
  border-bottom-color: var(--c-line);
  box-shadow: 0 6px 24px -18px rgba(26, 24, 24, 0.35);
}

.site-header.is-hidden,
.site-header.is-suppressed {
  transform: translateY(-100%);
}

.site-header:focus-within,
.site-header.menu-open {
  transform: none;
}

.site-header.menu-open::before {
  opacity: 0;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand__logo {
  height: clamp(2.5rem, 2.1rem + 1vw, 3.25rem);
  width: auto;
}

.nav {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: none;
}

.nav__list {
  display: flex;
  gap: clamp(1.5rem, 2.4vw, 2.75rem);
}

.nav__link {
  position: relative;
  display: inline-block;
  padding-block: 0.5rem;
  font-size: 0.875rem;
  letter-spacing: 0.005em;
  color: var(--c-ink);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.25rem;
  height: 1px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.6s var(--ease-expo);
}

.nav__link:hover::after,
.nav__link.is-active::after,
.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-header .nav__cta {
  display: none;
}

@media (min-width: 420px) {
  .site-header .nav__cta {
    display: inline-flex;
  }
}

@media (min-width: 1100px) {
  .nav {
    display: block;
  }

  .menu-toggle {
    display: none !important;
  }
}

/* --- Menu toggle -------------------------------------------------------- */

.menu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 44px;
  padding: 0.25rem 0;
}

.menu-toggle__label {
  font-family: var(--f-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.menu-toggle__icon {
  position: relative;
  width: 1.75rem;
  height: 0.6rem;
}

.menu-toggle__icon i {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.6s var(--ease-expo), top 0.6s var(--ease-expo);
}

.menu-toggle__icon i:first-child { top: 0; }
.menu-toggle__icon i:last-child { top: calc(100% - 1.5px); }

.menu-toggle[aria-expanded="true"] .menu-toggle__icon i:first-child {
  top: calc(50% - 0.75px);
  transform: rotate(18deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon i:last-child {
  top: calc(50% - 0.75px);
  transform: rotate(-18deg);
}

/* --- Mobile menu -------------------------------------------------------- */

.menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  display: flex;
  background: var(--c-paper);
  clip-path: inset(0 0 100% 0);
  transition: clip-path 0.8s var(--ease-expo);
  overflow-y: auto;
}

.menu.is-open {
  clip-path: inset(0 0 0 0);
}

.menu__inner {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 3rem;
  min-height: 100%;
  padding-top: calc(var(--header-h) + 2rem);
  padding-bottom: 2rem;
}

.menu__list {
  display: grid;
  border-top: 1px solid var(--c-line);
}

.menu__list li {
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}

.menu__link {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding: 0.9rem 0;
  font-size: clamp(2rem, 1.2rem + 4.5vw, 4rem);
  line-height: 1.05;
  letter-spacing: var(--tracking-display);
  transform: translateY(105%);
  transition: transform 0.9s var(--ease-expo), color 0.3s;
  transition-delay: 0s;
}

.menu.is-open .menu__link {
  transform: none;
  transition-delay: calc(0.12s + var(--i) * 0.05s), 0s;
}

.menu__link:hover {
  color: var(--c-accent);
}

.menu__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  font-size: var(--fs-small);
}

/* --- Buttons & links ---------------------------------------------------- */

.btn {
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.9rem;
  min-height: 3.25rem;
  padding: 0 1.6rem;
  overflow: hidden;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0;
  white-space: nowrap;
  transition: color 0.5s var(--ease-expo), border-color 0.5s var(--ease-expo);
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.6s var(--ease-expo);
}

.btn:hover::before,
.btn:focus-visible::before {
  transform: scaleY(1);
}

.btn--sm {
  min-height: 2.5rem;
  padding: 0 1.1rem;
  font-size: 0.8125rem;
}

.btn--solid {
  background: var(--c-ink);
  color: var(--c-paper);
}

.btn--solid::before {
  background: var(--c-accent-ink);
}

.btn--outline {
  border: 1px solid var(--c-line-strong);
  color: var(--c-ink);
}

.btn--outline::before {
  background: var(--c-ink);
}

.btn--outline:hover,
.btn--outline:focus-visible {
  color: var(--c-paper);
  border-color: var(--c-ink);
}

.btn--light {
  background: var(--c-paper);
  color: var(--c-ink);
}

.btn--light::before {
  background: var(--c-accent-ink);
}

.btn--light:hover,
.btn--light:focus-visible {
  color: var(--c-paper);
}

.btn[disabled] {
  cursor: progress;
  opacity: 0.7;
}

.icon-arrow {
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  transition: transform 0.6s var(--ease-expo);
}

.btn:hover .icon-arrow,
.link-cta:hover .icon-arrow,
.btn:focus-visible .icon-arrow,
.link-cta:focus-visible .icon-arrow {
  transform: translateX(0.3rem);
}

.link-cta:hover .icon-arrow--external,
.link-cta:focus-visible .icon-arrow--external {
  transform: translate(0.2rem, -0.2rem);
}

/* Faint logo-red line at rest; a solid one sweeps in on hover. */
.link-underline {
  background-image:
    linear-gradient(var(--c-accent), var(--c-accent)),
    linear-gradient(rgba(233, 56, 25, 0.35), rgba(233, 56, 25, 0.35));
  background-size: 0% 2px, 100% 1px;
  background-position: 100% 100%, 0% 100%;
  background-repeat: no-repeat;
  transition: background-size 0.6s var(--ease-expo);
}

.link-underline:hover,
.link-underline:focus-visible {
  background-size: 100% 2px, 100% 1px;
  background-position: 0% 100%, 0% 100%;
}

.link-cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.6rem 0;
  font-size: 0.9375rem;
  font-weight: 500;
}

.link-cta::before,
.link-cta::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: currentColor;
}

.link-cta::before {
  opacity: 0.3;
}

.link-cta::after {
  height: 2px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.7s var(--ease-expo);
}

.link-cta:hover::after,
.link-cta:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.link-cta .icon-arrow {
  transition: transform 0.6s var(--ease-expo), stroke 0.4s var(--ease-out);
}

.link-cta:hover .icon-arrow,
.link-cta:focus-visible .icon-arrow {
  stroke: var(--c-accent);
}

/* --- Scroll cue --------------------------------------------------------- */

.scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  font-family: var(--f-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.scroll-cue__track {
  position: relative;
  width: 1px;
  height: 2.75rem;
  background: var(--c-line-strong);
  overflow: hidden;
}

.scroll-cue__track span {
  position: absolute;
  inset: 0;
  background: var(--c-accent);
  transform: translateY(-100%);
  animation: scroll-cue 2.4s var(--ease-in-out) infinite;
}

.scroll-cue--light {
  color: var(--c-paper);
}

.scroll-cue--light .scroll-cue__track {
  background: rgba(247, 247, 244, 0.3);
}

.scroll-cue--light .scroll-cue__track span {
  background: var(--c-accent);
}

@keyframes scroll-cue {
  0% { transform: translateY(-100%); }
  50% { transform: translateY(0); }
  100% { transform: translateY(100%); }
}

/* --- Form fields -------------------------------------------------------- */

.field {
  position: relative;
  display: grid;
  gap: 0.35rem;
  margin-bottom: 1.6rem;
}

.field-row {
  display: grid;
  column-gap: 2rem;
}

@media (min-width: 640px) {
  .field-row {
    grid-template-columns: 1fr 1fr;
  }
}

.field__label {
  font-family: var(--f-mono);
  font-size: var(--fs-label);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--c-ink);
  transition: color 0.3s var(--ease-out);
}

.field:focus-within .field__label {
  color: var(--c-accent-ink);
}

.field__input {
  width: 100%;
  min-height: 3rem;
  padding: 0.65rem 0;
  border: 0;
  border-bottom: 1px solid var(--c-line-strong);
  border-radius: 0;
  background: transparent;
  font-size: 1.0625rem;
  line-height: 1.5;
  transition: border-color 0.3s, box-shadow 0.3s;
  -webkit-appearance: none;
  appearance: none;
}

.field__input--area {
  resize: vertical;
  min-height: 8rem;
}

.field__input:hover {
  border-bottom-color: var(--c-ink);
}

.field__input:focus,
.field__input:focus-visible {
  outline: none;
  border-bottom-color: var(--c-accent);
  box-shadow: 0 1px 0 0 var(--c-accent);
}

.field__input[aria-invalid="true"] {
  border-bottom-color: var(--c-error);
  box-shadow: 0 1px 0 0 var(--c-error);
}

.field__select {
  position: relative;
}

.field__select::after {
  content: "";
  position: absolute;
  right: 0.25rem;
  top: 50%;
  width: 0.5rem;
  height: 0.5rem;
  border-right: 1.5px solid var(--c-ink);
  border-bottom: 1.5px solid var(--c-ink);
  transform: translateY(-75%) rotate(45deg);
  pointer-events: none;
}

.field__select select {
  padding-right: 2rem;
  cursor: pointer;
}

.field__error {
  font-size: 0.8125rem;
  color: var(--c-error);
}

.field__error:empty {
  display: none;
}

.field--trap {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}