.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;

  color: var(--color-graphite);

  transition:
    background 500ms cubic-bezier(0.16, 1, 0.3, 1),
    color 500ms cubic-bezier(0.16, 1, 0.3, 1),
    border-color 500ms cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.site-header::after {
  content: "";

  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;

  height: 1px;

  background: transparent;

  transition: background 500ms ease;
}

.site-header.is-scrolled {
  color: #fff;

  background: rgba(17, 24, 39, 0.9);

  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);

  box-shadow:
    0 12px 35px rgba(17, 24, 39, 0.08);
}

.site-header.is-scrolled::after {
  background: rgba(255, 255, 255, 0.09);
}

.site-header__inner {
  position: relative;
  z-index: 102;

  width: min(100%, var(--container));
  min-height: 7.25rem;

  margin-inline: auto;
  padding-inline: var(--page-gutter);

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;

  transition:
    min-height 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.site-header.is-scrolled .site-header__inner {
  min-height: 5.25rem;
}

/* Brand */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.95rem;

  flex: 0 0 auto;
}

.brand__mark {
  position: relative;

  display: grid;
  width: 3.6rem;
  height: 3.6rem;

  place-items: center;

  border: 1px solid currentColor;
  border-radius: 50%;

  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.06em;

  transition:
    background var(--transition-medium),
    color var(--transition-medium),
    border-color var(--transition-medium),
    transform var(--transition-medium);
}

.brand__mark::after {
  content: "";

  position: absolute;
  top: 0.25rem;
  right: 0.25rem;

  width: 0.42rem;
  height: 0.42rem;

  border-radius: 50%;
  background: var(--color-accent);

  transform: scale(0.85);

  transition: transform var(--transition-medium);
}

.brand:hover .brand__mark {
  transform: rotate(-10deg) scale(1.025);
}

.brand:hover .brand__mark::after {
  transform: scale(1.25);
}

.site-header.is-scrolled .brand__mark {
  border-color: rgba(255, 255, 255, 0.3);
}

.brand__identity {
  display: grid;
  gap: 0.15rem;
}

.brand__identity strong {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.brand__identity small {
  color: var(--color-muted);

  font-size: 0.55rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;

  transition: color 500ms ease;
}

.site-header.is-scrolled .brand__identity small {
  color: rgba(255, 255, 255, 0.4);
}

/* Desktop nav */

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2vw, 2.4rem);

  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: -0.015em;
}

.site-nav > a {
  position: relative;

  padding-block: 0.7rem;

  white-space: nowrap;
}

.site-nav > a:not(.site-nav__contact)::after {
  content: "";

  position: absolute;
  right: 0;
  bottom: 0.35rem;
  left: 0;

  height: 1px;

  background: currentColor;

  transform: scaleX(0);
  transform-origin: right;

  transition:
    transform var(--transition-medium);
}

.site-nav > a:not(.site-nav__contact):hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-nav__contact {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.site-nav__contact span {
  width: 0.46rem;
  height: 0.46rem;

  border-radius: 50%;
  background: var(--color-accent);

  box-shadow:
    0 0 0 0 rgba(25, 179, 148, 0.42);

  animation: contact-pulse 2.7s ease-out infinite;
}

/* Hamburger */

.menu-toggle {
  display: none;

  padding: 0;

  border: 0;
  background: transparent;
  color: currentColor;

  cursor: pointer;
}

.menu-toggle__label {
  font-size: 0.63rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.menu-toggle__icon {
  position: relative;

  width: 2.7rem;
  height: 2.7rem;

  display: grid;
  place-items: center;

  border: 1px solid currentColor;
  border-radius: 50%;

  transition:
    background var(--transition-medium),
    border-color var(--transition-medium),
    transform var(--transition-medium);
}

.menu-toggle__icon i {
  position: absolute;

  width: 1rem;
  height: 1px;

  background: currentColor;

  transition:
    transform 500ms cubic-bezier(0.16, 1, 0.3, 1),
    top 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.menu-toggle__icon i:first-child {
  top: 1.08rem;
}

.menu-toggle__icon i:last-child {
  top: 1.55rem;
}

@media (hover: hover) and (pointer: fine) {
  .menu-toggle:hover .menu-toggle__icon {
    transform: rotate(-7deg);
  }
}

.site-header.menu-open {
  color: #fff;
  background: var(--color-graphite);
}

.site-header.menu-open::after {
  background: rgba(255, 255, 255, 0.08);
}

.site-header.menu-open .menu-toggle__icon {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.05);
}

.site-header.menu-open .menu-toggle__icon i:first-child {
  top: 1.34rem;
  transform: rotate(45deg);
}

.site-header.menu-open .menu-toggle__icon i:last-child {
  top: 1.34rem;
  transform: rotate(-45deg);
}

/* Mobile menu */

.mobile-menu {
  position: fixed;
  inset: 0;

  z-index: 101;

  visibility: hidden;

  background-color: var(--color-graphite);
  background-image:
    radial-gradient(
      circle at 85% 12%,
      rgba(25, 179, 148, 0.16),
      transparent 30%
    );

  isolation: isolate;

  color: #fff;

  opacity: 0;

  transform: translateY(-1.5rem);

  transition:
    opacity 450ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 600ms cubic-bezier(0.16, 1, 0.3, 1),
    visibility 0s 600ms;
}

.site-header.menu-open .mobile-menu {
  visibility: visible;

  opacity: 1;
  transform: translateY(0);

  transition:
    opacity 450ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 600ms cubic-bezier(0.16, 1, 0.3, 1),
    visibility 0s;
}

.mobile-menu::before {
  content: "";

  position: absolute;
  inset: 0;

  background:
    linear-gradient(
      rgba(255, 255, 255, 0.025) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.025) 1px,
      transparent 1px
    );

  background-size: 46px 46px;

  mask-image:
    linear-gradient(
      to bottom,
      transparent,
      #000 15%,
      #000
    );

  pointer-events: none;
}

.mobile-menu__inner {
  position: relative;
  z-index: 2;

  min-height: 100svh;

  padding:
    8rem
    var(--page-gutter)
    2rem;

  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.mobile-menu__nav {
  display: grid;
}

.mobile-menu__nav a {
  padding: 0.9rem 0;

  display: grid;
  grid-template-columns: 2.8rem 1fr;
  align-items: baseline;

  border-bottom: 1px solid rgba(255, 255, 255, 0.08);

  opacity: 0;
  transform: translateY(1rem);

  transition:
    opacity 450ms ease,
    transform 550ms cubic-bezier(0.16, 1, 0.3, 1);
}

.site-header.menu-open .mobile-menu__nav a {
  opacity: 1;
  transform: translateY(0);
}

.site-header.menu-open .mobile-menu__nav a:nth-child(1) {
  transition-delay: 100ms;
}

.site-header.menu-open .mobile-menu__nav a:nth-child(2) {
  transition-delay: 150ms;
}

.site-header.menu-open .mobile-menu__nav a:nth-child(3) {
  transition-delay: 200ms;
}

.site-header.menu-open .mobile-menu__nav a:nth-child(4) {
  transition-delay: 250ms;
}

.site-header.menu-open .mobile-menu__nav a:nth-child(5) {
  transition-delay: 300ms;
}

.site-header.menu-open .mobile-menu__nav a:nth-child(6) {
  transition-delay: 350ms;
}

.mobile-menu__nav a > span {
  color: var(--color-accent);

  font-size: 0.52rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.mobile-menu__nav strong {
  font-size: clamp(2.3rem, 9vw, 4rem);
  font-weight: 500;
  letter-spacing: -0.05em;
  line-height: 1;
}

.mobile-menu__footer {
  padding-top: 2rem;

  display: flex;
  justify-content: space-between;
  gap: 2rem;

  border-top: 1px solid rgba(255, 255, 255, 0.1);

  color: rgba(255, 255, 255, 0.38);

  font-size: 0.55rem;
  font-weight: 500;
}

.mobile-menu__footer div {
  display: flex;
  gap: 1rem;
}

.mobile-menu__footer a {
  transition: color var(--transition-fast);
}

.mobile-menu__footer a:hover {
  color: #fff;
}

body.menu-open {
  overflow: hidden;
}



/* Responsive */

@media (max-width: 1040px) {
  .site-nav {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
  }
}

@media (max-width: 680px) {
  .site-header__inner {
    min-height: 5.9rem;
  }

  .site-header.is-scrolled .site-header__inner {
    min-height: 4.8rem;
  }

  .brand__mark {
    width: 3rem;
    height: 3rem;
  }

  .brand__identity small {
    display: none;
  }

  .menu-toggle__label {
    display: none;
  }

  .mobile-menu__inner {
    padding-top: 7rem;
  }

  .mobile-menu__footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.9rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-header__inner,
  .brand__mark,
  .mobile-menu,
  .mobile-menu__nav a,
  .menu-toggle__icon,
  .menu-toggle__icon i {
    transition: none;
  }

  .site-nav__contact span {
    animation: none;
  }
}

.button {
  min-height: 3.65rem;
  padding: 0.45rem 0.5rem 0.45rem 1.35rem;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;

  border-radius: var(--radius-round);

  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: -0.025em;

  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.button--primary {
  background: var(--color-graphite);
  color: #fff;
}

.button__icon {
  display: grid;
  width: 2.7rem;
  height: 2.7rem;
  place-items: center;

  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-graphite);

  font-size: 1.05rem;

  transition: transform var(--transition-medium);
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 25px rgba(17, 24, 39, 0.15);
}

.button:hover .button__icon {
  transform: rotate(45deg);
}

.text-link {
  position: relative;

  display: inline-flex;
  align-items: center;
  gap: 0.65rem;

  padding-block: 0.9rem;

  font-size: 0.87rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.text-link::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0.65rem;
  left: 0;

  height: 1px;
  background: var(--color-graphite);

  transform: scaleX(0.2);
  transform-origin: left;
  transition: transform var(--transition-medium);
}

.text-link:hover::after {
  transform: scaleX(1);
}

@keyframes contact-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(25, 179, 148, 0.4);
  }

  60%,
  100% {
    box-shadow: 0 0 0 7px rgba(25, 179, 148, 0);
  }
}

@media (max-width: 720px) {
  .site-header__inner {
    min-height: 5.75rem;
  }

  .site-nav {
    gap: 1.15rem;
  }

  .site-nav a:nth-child(1),
  .site-nav a:nth-child(3) {
    display: none;
  }
}

/* =========================================================
   MOBILE MENU — SCROLLED STATE FIX
   ========================================================= */

.site-header.menu-open,
.site-header.is-scrolled.menu-open {
  background: var(--color-graphite) !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  box-shadow: none !important;
}

.site-header.menu-open .mobile-menu,
.site-header.is-scrolled.menu-open .mobile-menu {
  background: var(--color-graphite) !important;
  background-color: var(--color-graphite) !important;

  opacity: 1;
}

.site-header.menu-open::after,
.site-header.is-scrolled.menu-open::after {
  background: rgba(255, 255, 255, 0.08);
}


/* =========================================================
   BRAND MARK — PERMANENT TILT
   ========================================================= */

.brand .brand__mark {
  transform: rotate(-7deg);
}

.brand:hover .brand__mark {
  transform: rotate(-10deg) scale(1.025);
}

.site-header.is-scrolled .brand__mark {
  transform: rotate(-7deg);
}

.site-header.is-scrolled .brand:hover .brand__mark {
  transform: rotate(-10deg) scale(1.025);
}