/* Header: zwevende balk met woordmerk, frequentie-uitlezing en menu. */

.site-header {
  position: fixed;
  inset: calc(var(--space-xs) + env(safe-area-inset-top)) var(--gutter) auto;
  z-index: var(--z-header);
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: var(--space-m);
  height: var(--header-height);
  padding-inline: var(--space-m) var(--space-xs);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  transition: background-color var(--duration-base) var(--ease-out), border-color var(--duration-base) var(--ease-out), box-shadow var(--duration-base) var(--ease-out);
}

.site-header.is-scrolled {
  background: oklch(0.13 0.04 278 / 0.88);
  border-color: var(--line);
  box-shadow: 0 18px 40px -24px oklch(0.05 0.02 278 / 0.9);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  backdrop-filter: blur(14px) saturate(1.3);
}

.site-header__brand {
  display: flex;
  align-items: center;
  min-height: var(--tap-min);
}

.wordmark {
  width: 8.5rem;
  height: auto;
  overflow: visible;
}

.wordmark__text {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-stretch: 150%;
  font-size: 50px;
  letter-spacing: -1px;
  fill: url(#chrome);
  stroke: oklch(0.97 0.02 230 / 0.6);
  stroke-width: 0.6px;
}

/* Frequentie-uitlezing: verandert mee met de sectie in beeld */
.tuner-readout {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-s);
  background: oklch(0.1 0.03 278);
  box-shadow: inset 0 0 0 1px oklch(0.85 0.15 78 / 0.18), inset 0 0 18px oklch(0.85 0.15 78 / 0.08);
  font-family: var(--font-display);
  color: var(--amber);
  text-shadow: 0 0 10px var(--amber-glow);
  white-space: nowrap;
}

.tuner-readout__band {
  font-stretch: 60%;
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
}

.tuner-readout__freq {
  min-width: 3.4ch;
  font-weight: 700;
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.tuner-readout__label {
  font-stretch: 70%;
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-dim);
  text-shadow: none;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-s);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-height: var(--tap-min);
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-stretch: 100%;
  font-weight: 650;
  font-size: 0.95rem;
  line-height: 1.1;
  white-space: nowrap;
  text-decoration: none;
  color: var(--paper-dim);
  transition: color var(--duration-base) var(--ease-out), background-color var(--duration-base) var(--ease-out);
}

.site-nav__freq {
  font-stretch: 62%;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--paper-faint);
  font-variant-numeric: tabular-nums;
}

.site-nav__link:hover,
.site-nav__link[aria-current='true'] {
  color: var(--paper);
  background: oklch(0.31 0.085 282 / 0.55);
}

.site-nav__link[aria-current='true'] .site-nav__freq {
  color: var(--amber);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-min);
  padding: 0 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--paper);
}

.lang-switch:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.menu-toggle {
  display: none;
  justify-self: end;
  width: var(--tap-min);
  height: var(--tap-min);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--night-800);
  place-items: center;
}

/* ---------- Tablet en kleine laptop: menu achter een knop ---------- */

@media (max-width: 1180px) {
  .site-header {
    grid-template-columns: auto 1fr auto;
    background: oklch(0.13 0.04 278 / 0.88);
    border-color: var(--line);
    -webkit-backdrop-filter: blur(14px) saturate(1.3);
    backdrop-filter: blur(14px) saturate(1.3);
  }

  .tuner-readout {
    justify-self: center;
  }

  .menu-toggle {
    display: inline-grid;
  }

  .site-nav {
    position: fixed;
    inset: calc(var(--header-height) + var(--space-xs) * 2 + env(safe-area-inset-top)) var(--gutter) auto;
    max-height: calc(100svh - var(--header-height) - 2rem - env(safe-area-inset-top));
    overflow-y: auto;
    overscroll-behavior: contain;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-s);
    padding: var(--space-m);
    border: 1px solid var(--line);
    border-radius: var(--radius-l);
    background: var(--night-950);
    box-shadow: 0 30px 60px -20px oklch(0.05 0.02 278 / 0.95);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out), visibility var(--duration-base);
  }

  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .site-nav__link {
    flex-direction: row;
    align-items: center;
    gap: 1rem;
    padding: 0.6rem 0.9rem;
    font-size: 1.25rem;
    font-stretch: 125%;
    border-radius: var(--radius-m);
  }

  .site-nav__freq {
    width: 3.2rem;
    font-size: 0.8rem;
    color: var(--amber);
  }

  .lang-switch {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .site-header {
    inset: calc(var(--space-2xs) + env(safe-area-inset-top)) max(var(--space-2xs), env(safe-area-inset-right)) auto max(var(--space-2xs), env(safe-area-inset-left));
    gap: var(--space-xs);
    padding-inline: var(--space-s) var(--space-2xs);
  }

  .wordmark {
    width: 6.6rem;
  }

  .tuner-readout__label {
    display: none;
  }

  .site-nav {
    inset-inline: var(--space-2xs);
  }
}

@media (max-width: 420px) {
  .tuner-readout__band {
    display: none;
  }

  .wordmark {
    width: 5.8rem;
  }
}