/* ─── GLOBAL BOX-SIZING ───────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* ─── HEADER WRAPPER ───────────────────────────────────────── */
.site-header {
  position: absolute;
  top: 0;
  inset-inline: 0;
  z-index: 999;
  height: auto;
  background: transparent;
  backdrop-filter: none;
  border-bottom: 0;
  box-shadow: none;
  padding: 1rem 0;
  transition: opacity .25s ease, visibility .25s ease;
}

.site-header:not(.is-visible) {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* ─── INNER FLEX CONTAINER ────────────────────────────────── */
.site-header__inner {
  max-width: 100%;
  margin-inline: auto;
  padding: 0 2rem;               /* horizontal padding */
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: 3rem;
}

/* push nav elements to the right on desktop */
@media (min-width: 768px) {
  .nav-toggle,
  .main-nav {
    margin-left: auto;
  }
}

/* ─── BRAND MARK ───────────────────────────────────────────── */
.brand {
  font-family: 'Segoe UI', sans-serif;
  font-size: clamp(1rem, 1vw, 1rem);
  color: #fff;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}
.brand__dot {
  width: 0.9rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: hsl(198 100% 60%);
  box-shadow: 0 0 8px hsl(198 100% 60% / .9);
}
.brand__alt {
  color: hsl(198 100% 60%);
}

/* ─── NAVIGATION LINKS ────────────────────────────────────── */
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2rem;
}
.main-nav a {
  font-size: clamp(1rem, 1vw, 1rem);
  color: #cfd3dc;
  text-decoration: none;
  position: relative;
  font-weight: 500;
  transition: color .25s ease;
  pointer-events: auto;
  opacity: 1;
}
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 100%; height: 2px;
  background: hsl(198 100% 60%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.main-nav a:hover,
.main-nav a:focus {
  color: #fff;
}
.main-nav a:hover::after,
.main-nav a:focus::after {
  transform: scaleX(1);
}
.main-nav a.is-active {
  color: #fff;
  pointer-events: auto;
  opacity: 1;
}
.main-nav a.is-active::after {
  transform: scaleX(1);
}

/* ─── HAMBURGER TOGGLE (<768px) ─────────────────────────── */
.nav-toggle {
  --bar-w: 26px;
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}
.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: '';
  display: block;
  width: var(--bar-w);
  height: 3px;
  background: #fff;
  border-radius: 2px;
  transition: transform .35s ease, opacity .35s ease;
}
.nav-toggle__bar::before { transform: translateY(-8px); }
.nav-toggle__bar::after  { transform: translateY(8px); }

/* open/close animation */
.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: transparent;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before {
  transform: translateY(0) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after {
  transform: translateY(0) rotate(-45deg);
}

/* ─── MOBILE NAV (max-width: 767px) ───────────────────────── */
@media (max-width: 767px) {
  .site-header {
    height: auto;
    padding: 0.6rem 0;
    display: flex;
    align-items: center;
  }

  .site-header__inner {
    width: 100%;
    justify-content: space-between;
    gap: 1rem;
    padding: 0 1rem;
  }

  .brand {
    font-size: 1rem;
    gap: 0.5rem;
  }

  .nav-toggle {
    display: block;
    z-index: 1001;
  }

  .main-nav {
    position: fixed;
    inset-inline: 0;
    top: 0;
    min-height: 100dvh;
    background: rgb(14 23 37 / 0.92);
    backdrop-filter: blur(4px);
    transform: translateY(-100%);
    transition: transform .4s ease;
    padding-top: 88px;
    z-index: 1000;
  }
  .main-nav[data-open="true"] {
    transform: translateY(0);
  }
  .main-nav ul {
    flex-direction: column;
    gap: 1.25rem;
    padding: 1.5rem 0;
    text-align: center;
  }

  .main-nav a {
    font-size: 1.2rem;
  }
}