/* ─── Site Header ────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

/* ─── Nav Inner ──────────────────────────────────────────────── */
/* Full-width jak p2pa.pl — bez max-width kontenera */
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: 100%;
  padding: 0 var(--padding-desktop);
}

/* ─── Logo ───────────────────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-logo img {
  height: 36px;
  width: auto;
}

.nav-logo-text {
  font-family: var(--font-sans);
  font-size: 35px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--color-text);
  text-transform: uppercase;
  line-height: 1;
}

/* ─── Nav Links ──────────────────────────────────────────────── */
.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: var(--font-size-sm);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
  position: relative;
  transition: font-weight var(--transition);
}

.nav-links a.active {
  font-weight: 700;
}

/* ─── Active page — CSS fallback (reliable on any hosting) ───── */
body[data-page="projects"] .nav-links a[href="projekty.html"],
body[data-page="projects"] .nav-mobile a[href="projekty.html"],
body[data-page="about"]    .nav-links a[href="o-nas.html"],
body[data-page="about"]    .nav-mobile a[href="o-nas.html"],
body[data-page="contact"]  .nav-links a[href="kontakt.html"],
body[data-page="contact"]  .nav-mobile a[href="kontakt.html"] {
  font-weight: 700;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav-links a:hover {
  font-weight: 700;
}

.nav-links a.active {
  color: var(--color-text);
}

/* ─── Social Icons ───────────────────────────────────────────── */
.nav-social {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--color-border);
}

.nav-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  transition: color var(--transition);
}

.nav-social a:hover {
  color: var(--color-accent);
}

.nav-social svg {
  width: 16px;
  height: 16px;
}

/* ─── Mobile Toggle ──────────────────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ─── Mobile Menu ────────────────────────────────────────────── */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 24px var(--padding-desktop);
  flex-direction: column;
  gap: 20px;
  z-index: 999;
  animation: slideDown 0.3s ease;
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile a {
  font-size: var(--font-size-base);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text);
  transition: color var(--transition);
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
}

.nav-mobile a:hover,
.nav-mobile a.active {
  color: var(--color-text);
}

.nav-mobile a.active {
  font-weight: 700;
}

.nav-mobile-social {
  display: flex;
  gap: 16px;
  padding-top: 8px;
}

.nav-mobile-social a {
  border: none;
  padding: 0;
  color: var(--color-text-light);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Homepage — przezroczysta nawigacja ─────────────────── */
.page-home .site-header {
  background: transparent;
  border-bottom: none;
}

.page-home .site-header.scrolled {
  box-shadow: none;
}

.page-home .nav-logo-text {
  color: #ffffff;
}

.page-home .nav-links a {
  color: rgba(255, 255, 255, 0.9);
}

.page-home .nav-links a:hover {
  color: #ffffff;
}

.page-home .nav-links a::after {
  background: #ffffff;
}

.page-home .nav-social {
  border-left-color: rgba(255, 255, 255, 0.3);
}

.page-home .nav-social a {
  color: rgba(255, 255, 255, 0.7);
}

.page-home .nav-social a:hover {
  color: #ffffff;
}

.page-home .nav-toggle span {
  background: #ffffff;
}

/* ─── Language Switcher ──────────────────────────────────────── */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--color-border);
}

.lang-btn {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-light);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  transition: color var(--transition);
  line-height: 1;
}

.lang-btn:hover {
  color: var(--color-accent);
}

.lang-btn.active {
  font-weight: 700;
  color: var(--color-text);
}

.lang-separator {
  color: var(--color-border);
  font-size: var(--font-size-sm);
  user-select: none;
  line-height: 1;
}

/* ─── Mobile Language Switcher ───────────────────────────────── */
.lang-switcher-mobile {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 4px;
}

.lang-switcher-mobile .lang-btn {
  font-size: var(--font-size-base);
}

.lang-switcher-mobile .lang-separator {
  font-size: var(--font-size-base);
}

/* ─── Homepage — biały przełącznik ───────────────────────────── */
.page-home .lang-switcher {
  border-left-color: rgba(255, 255, 255, 0.3);
}

.page-home .lang-btn {
  color: rgba(255, 255, 255, 0.7);
}

.page-home .lang-btn:hover,
.page-home .lang-btn.active {
  color: #ffffff;
}

.page-home .lang-separator {
  color: rgba(255, 255, 255, 0.4);
}