/**
 * header-nav.css — Gradbau.com
 * Site header: brand, main nav, language switcher, theme toggle.
 * Used on all pages except inline-styled home (temporarily).
 * Sector-bar is NOT here — it lives in home page inline styles only.
 */

/* ── Site header ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 36px;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

/* ── Brand ── */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-d);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
  color: var(--text);
  text-decoration: none;
}
.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 55%, transparent);
}

/* ── Main nav ── */
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav[hidden] { display: none; }
.main-nav a {
  font-family: var(--font-d);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.main-nav a:hover { color: var(--accent); text-decoration: none; }

/* Active page indicator — applied to current section's nav link */
.main-nav a.on {
  color: var(--accent);
}

/* ── Header right (lang switcher + theme toggle) ── */
.hdr-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.lang-switch {
  display: flex;
  gap: 4px;
}
.lang-switch button {
  font-family: var(--font-m);
  font-size: 10px;
  padding: 5px 8px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--bg-3);
  color: var(--text-2);
  cursor: pointer;
  transition: border-color var(--transition-fast),
              color var(--transition-fast),
              background var(--transition-fast);
}
.lang-switch button:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.lang-switch button.on {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

/* ── Theme toggle ── */
#theme-toggle {
  width: 40px;
  height: 36px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--bg-3);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
#theme-toggle:hover { border-color: var(--accent); }

/* ── Mobile ── */
@media (max-width: 760px) {
  .site-header { padding: 0 18px; }
  .main-nav { display: none; }
}