/* Site navigation. Markup: scripts/layout (npm run sync:layout). Behaviour: js/nav.js.
   Fingerprinted: pages load nav.<hash>.css, which sync:layout rewrites. */

.site-nav {
  --nav-h: 56px;
  position: fixed; top: 0; left: 0; right: 0; z-index: 100; height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0 2rem; background: rgba(5,8,16,0.92); border-bottom: 1px solid var(--border);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
}

.nav-logo {
  font-family: 'Exo 2', sans-serif; font-weight: 900; font-size: 1.2rem;
  letter-spacing: 0.08em; text-decoration: none; display: flex; align-items: baseline; flex-shrink: 0;
}
.nav-logo img { height: 1.4em; width: auto; align-self: center; transform: translateY(-0.07em); margin-right: 0.3em; }
.nav-logo .star  { color: var(--accent); text-shadow: 0 0 20px var(--accent); }
.nav-logo .kraft { color: #fff; }
.nav-logo .ika   { color: var(--accent2); text-shadow: 0 0 20px var(--accent2); }

.nav-right { display: flex; align-items: center; gap: 2rem; }
.nav-links { display: flex; align-items: center; gap: 2rem; }

/* Links and dropdown buttons share one look. */
.nav-link {
  font-family: 'Share Tech Mono', monospace; font-size: var(--fs-small); letter-spacing: 0.1em; line-height: 1.4;
  color: var(--muted); text-decoration: none; text-transform: uppercase; white-space: nowrap;
  background: none; border: 0; border-bottom: 2px solid transparent; padding: 0 0 2px; cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.nav-link:hover, .nav-link[aria-expanded='true'] { color: var(--accent); }
.nav-link.active { color: var(--accent); border-bottom-color: var(--accent); }
.nav-link.nav-active { color: var(--accent); } /* homepage: the section currently on screen */
.site-nav a:focus-visible, .site-nav button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* "New" dot */
.nav-link-new { position: relative; }
.nav-link-new::after {
  content: ''; position: absolute; top: -3px; right: -9px; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent2); box-shadow: 0 0 8px var(--accent2);
}

/* Dropdown groups */
.nav-group { position: relative; display: flex; } /* flex, so the button lines up with the plain links instead of a text baseline */
.nav-group-btn { display: inline-flex; align-items: center; gap: 0.5em; }
.nav-group-btn::after {
  content: ''; width: 0.38em; height: 0.38em; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: translateY(-30%) rotate(45deg); transition: transform 0.2s;
}
.nav-group-btn[aria-expanded='true']::after { transform: translateY(10%) rotate(-135deg); }
.nav-menu {
  display: none; position: absolute; top: calc(100% + 1rem); left: -1rem; min-width: 13rem; padding: 0.4rem 0;
  background: rgba(5,8,16,0.97); border: 1px solid var(--border);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); box-shadow: 0 12px 32px rgba(0,0,0,0.45);
}
.nav-menu::before { content: ''; position: absolute; left: 0; right: 0; bottom: 100%; height: 1rem; } /* keeps hover across the gap */
.nav-group-btn[aria-expanded='true'] + .nav-menu { display: block; }
.nav-menu-link {
  display: block; padding: 0.65rem 1rem; border-left: 2px solid transparent;
  font-family: 'Share Tech Mono', monospace; font-size: var(--fs-label); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); text-decoration: none; white-space: nowrap; transition: color 0.2s, background 0.2s;
}
.nav-menu-link:hover { color: var(--accent); background: rgba(0,212,255,0.06); }
.nav-menu-link.active { color: var(--accent); border-left-color: var(--accent); }

/* EN / BG switch */
.lang-toggle { display: flex; border: 1px solid var(--border); overflow: hidden; flex-shrink: 0; }
/* Exo 2 has a real bold; Share Tech Mono's faked bold on a bright cyan fill was unreadable at this size.
   The selected language is light text on a tinted background, like the nav's active link. */
.lang-btn {
  display: block; padding: 0.4rem 0.8rem; cursor: pointer; background: transparent; border: none;
  font-family: 'Exo 2', sans-serif; font-weight: 700; font-size: var(--fs-small); line-height: 1.2; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--muted); text-decoration: none; transition: color 0.2s, background 0.2s;
}
.lang-btn.active { background: rgba(0,212,255,0.14); color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.lang-btn:not(.active):hover { color: var(--text); }

/* Menu button: only below the breakpoint */
.nav-hamburger {
  display: none; align-items: center; justify-content: center; padding: 0.4rem; margin-right: -0.4rem;
  background: none; border: none; color: var(--muted); cursor: pointer; transition: color 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.nav-hamburger svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.nav-hamburger:hover, .nav-hamburger[aria-expanded='true'] { color: var(--accent); }
.nav-hamburger .nav-icon-close, .nav-hamburger[aria-expanded='true'] .nav-icon-open { display: none; }
.nav-hamburger[aria-expanded='true'] .nav-icon-close { display: inline; }

/* Below ~960px the links don't fit: they move into a panel under the bar, and groups open inline. */
@media (max-width: 960px) {
  .site-nav { padding: 0 1.25rem; }
  .nav-right { gap: 1rem; }
  .nav-hamburger { display: flex; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch; gap: 0;
    position: absolute; top: 100%; left: 0; right: 0; max-height: calc(100vh - var(--nav-h)); overflow-y: auto;
    /* Opaque: a backdrop-filter inside the blurred bar has no effect, so page text would show through. */
    padding: 0.5rem 1.25rem 0.75rem; background: var(--bg); border-bottom: 1px solid var(--border);
    box-shadow: 0 16px 32px rgba(0,0,0,0.5);
  }
  .nav-links.open .nav-link {
    display: flex; justify-content: space-between; align-items: center; width: 100%;
    padding: 0.8rem 0.25rem; text-align: left; border-bottom: 1px solid var(--border);
  }
  .nav-links.open .nav-link.active { border-bottom-color: var(--border); }
  .nav-links.open > :last-child .nav-link, .nav-links.open > .nav-link:last-child { border-bottom: none; }
  .nav-links.open .nav-link-new::after { position: static; margin-left: 0.5rem; }
  .nav-group { position: static; flex-direction: column; }
  .nav-menu { position: static; min-width: 0; padding: 0.25rem 0 0.5rem; border: 0; background: none; box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .nav-menu::before { display: none; }
  .nav-menu-link { padding: 0.7rem 1rem; }
}
@media (max-width: 768px) {
  .site-nav { padding: 0 1rem; }
  .nav-logo { font-size: var(--fs-body); }
  .nav-right { gap: 0.75rem; }
}
@media print {
  .site-nav { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .nav-link, .nav-menu-link, .lang-btn, .nav-hamburger, .nav-group-btn::after { transition: none; }
}