/* ── Site navigation (common/nav.php) ─────────────────────────
   A translucent bar across the top of the hero image.
   < 768px : brand + menu button; links drop down in a full-width panel.
   ≥ 768px : brand left, links right, animated underline on hover/current.
   js/script.js adds .nav-ready and toggles .is-open; without JS the
   phone menu simply stays open so the links are always reachable. */

.site-nav {
  --nav-bg: rgba(2, 53, 70, 0.88);
  --nav-solid: #023546;
  --nav-text: #f4f8f9;
  --nav-accent: #7cc6de;
  --nav-height: 64px;
  --nav-pad: clamp(1rem, 4vw, 3rem);

  position: absolute;
  inset: 0 0 auto 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--nav-height);
  padding: 0 var(--nav-pad);
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ── Brand ── */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--nav-text);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
}
.brand-icon {
  width: 26px;
  height: 26px;
  color: var(--nav-accent);
  flex-shrink: 0;
}
.brand:hover {
  color: #fff;
}

/* ── Links ── */
.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-link {
  position: relative;
  display: block;
  color: var(--nav-text);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease;
}
.nav-link:hover {
  color: #fff;
}
.nav-link[aria-current="page"] {
  color: var(--nav-accent);
}

/* Shared keyboard focus ring */
.brand:focus-visible,
.nav-link:focus-visible,
.nav-toggle:focus-visible {
  outline: 2px solid var(--nav-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── Menu button (hamburger → X) ── */
.nav-toggle {
  display: none;   /* shown on phones once JS is ready */
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-right: -10px;   /* optical alignment with the bar edge */
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--nav-text);
  cursor: pointer;
}
.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}
.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s ease, background-color 0.25s ease;
}
.nav-toggle-bars {
  position: relative;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}
.nav-toggle-bars::before { transform: translateY(-7px); }
.nav-toggle-bars::after  { transform: translateY(7px); }

.site-nav.is-open .nav-toggle-bars { background: transparent; }
.site-nav.is-open .nav-toggle-bars::before { transform: rotate(45deg); }
.site-nav.is-open .nav-toggle-bars::after  { transform: rotate(-45deg); }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ── Phones & small tablets ── */
@media (max-width: 767.98px) {
  .site-nav {
    flex-wrap: wrap;
  }
  /* keep the brand row a constant height when the menu wraps beneath it */
  .brand {
    min-height: var(--nav-height);
  }
  .site-nav.nav-ready .nav-toggle {
    display: inline-flex;
  }

  .nav-menu {
    /* full-bleed panel: cancel the bar padding on both sides */
    flex: 0 0 auto;
    width: calc(100% + 2 * var(--nav-pad));
    margin: 0 calc(-1 * var(--nav-pad));
    padding-bottom: 0.5rem;
  }
  .nav-link {
    padding: 0.95rem var(--nav-pad);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }
  .nav-link:hover {
    background: rgba(255, 255, 255, 0.06);
  }
  .nav-link[aria-current="page"] {
    box-shadow: inset 3px 0 0 var(--nav-accent);
  }

  /* With JS: collapsed until the button opens it.
     visibility keeps hidden links out of the tab order; its delay lets the close animation finish. */
  .site-nav.nav-ready .nav-menu {
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    padding-bottom: 0;
    transition: max-height 0.3s ease, padding 0.3s ease, visibility 0s linear 0.3s;
  }
  .site-nav.nav-ready.is-open {
    background: var(--nav-solid);
  }
  .site-nav.nav-ready.is-open .nav-menu {
    max-height: 24rem;   /* comfortably more than the links need */
    visibility: visible;
    padding-bottom: 0.5rem;
    transition: max-height 0.3s ease, padding 0.3s ease, visibility 0s;
  }
}

/* ── Tablets & desktop ── */
@media (min-width: 768px) {
  .nav-menu {
    display: flex;
    align-items: center;
    gap: clamp(0.25rem, 2vw, 1.5rem);
  }
  .nav-link {
    padding: 0.6rem 0.5rem;
  }
  /* animated underline */
  .nav-link::after {
    content: "";
    position: absolute;
    left: 0.5rem;
    right: 0.5rem;
    bottom: 0.2rem;
    height: 2px;
    border-radius: 2px;
    background: var(--nav-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s ease;
  }
  .nav-link:hover::after,
  .nav-link:focus-visible::after,
  .nav-link[aria-current="page"]::after {
    transform: scaleX(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav *,
  .site-nav *::before,
  .site-nav *::after {
    transition: none !important;
  }
}