/* ==========================================================================
   FIBER GROUP - Header Styles
   ========================================================================== */

/* ---- Top Bar ---- */
.topbar {
  background: var(--color-dark);
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  position: relative;
  z-index: var(--z-sticky);
}

.topbar__inner {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}

.topbar__contacts {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}

.topbar__contact-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-xs);
  color: var(--color-text-inverse-sec);
  text-decoration: none;
  transition: color var(--t-fast);
  letter-spacing: 0.01em;
}

.topbar__contact-item:hover {
  color: var(--color-accent-light);
}

.topbar__contact-item svg {
  width: 14px;
  height: 14px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.topbar__right {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.topbar__lang {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.lang-btn {
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.06em;
  color: var(--color-text-inverse-muted);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--t-fast), background var(--t-fast);
  text-transform: uppercase;
}

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

.lang-btn.active {
  background: rgba(227, 174, 77, 0.12);
}

.lang-divider {
  width: 1px;
  height: 10px;
  background: rgba(255, 255, 255, 0.2);
}

/* ---- Main Header ---- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: var(--color-white);
  height: var(--header-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: none;
  /* Removed heavy shadow, keep premium clean logic */
  transition:
    height var(--t-slower) var(--ease-out),
    background var(--t-slower) var(--ease-out),
    box-shadow var(--t-slower) var(--ease-out),
    backdrop-filter var(--t-slower) var(--ease-out);
}

.site-header.scrolled {
  height: var(--header-h-scrolled);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 4px 16px rgba(12, 36, 68, 0.04);
}

.header__inner {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8);
}

/* ---- Logo ---- */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  flex-shrink: 0;
}



.site-logo__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.site-logo__mark svg {
  height: 44px;
  width: auto;
  transition: height var(--t-slow) var(--ease-out);
}

.site-header.scrolled .site-logo__mark svg {
  height: 36px;
}

.site-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.site-logo__name {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: var(--fw-extrabold);
  color: var(--color-dark);
  letter-spacing: var(--ls-tight);
  white-space: nowrap;
}

.site-logo__sub {
  font-family: var(--font-body);
  font-size: 0.6rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ---- Navigation ---- */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: var(--sp-2) var(--sp-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition:
    color var(--t-fast),
    background-color var(--t-fast);
  white-space: nowrap;
  letter-spacing: 0.01em;
  cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
}

.nav-link svg.dropdown-arrow {
  width: 14px;
  height: 14px;
  transition: transform var(--t-base) var(--ease-out);
  opacity: 0.6;
}

.nav-item:hover .dropdown-arrow,
.nav-item.open .dropdown-arrow {
  transform: rotate(180deg);
  opacity: 1;
}

/* ---- Dropdown ---- */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  min-width: 220px;
  padding: var(--sp-2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(-50%) translateY(0);
  transition:
    opacity var(--t-base) var(--ease-out),
    transform var(--t-base) var(--ease-out),
    visibility var(--t-base);
  z-index: var(--z-dropdown);
  margin-top: 8px;
  /* replaced top offset with margin */
}

/* Invisible bridge for hover gap */
.dropdown-menu::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 10px;
}

.nav-item:hover .dropdown-menu,
.nav-item.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition:
    color var(--t-fast),
    background-color var(--t-fast);
}

.dropdown-item:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
}

.dropdown-item svg {
  width: 15px;
  height: 15px;
  color: var(--color-text-muted);
  flex-shrink: 0;
  transition: color var(--t-fast);
}

.dropdown-item:hover svg {
  color: var(--color-accent);
}

.dropdown-divider {
  height: 1px;
  background: var(--color-border-light);
  margin: var(--sp-2);
}

/* ---- Hamburger ---- */
.hamburger-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--t-fast);
}

.hamburger-btn:hover {
  background: var(--color-surface-2);
}

.hamburger-btn span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition:
    transform var(--t-base) var(--ease-out),
    opacity var(--t-base) var(--ease-out);
  transform-origin: center;
}

.hamburger-btn.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.hamburger-btn.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger-btn.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---- Mobile Nav Overlay ---- */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: var(--color-white);
  z-index: calc(var(--z-overlay) - 1);
  padding: var(--sp-6);
  padding-top: calc(var(--topbar-h) + var(--header-h) + var(--sp-4));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(30px);
  transition:
    opacity var(--t-base) var(--ease-out),
    visibility var(--t-base) var(--ease-out),
    transform var(--t-slower) var(--ease-out);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(0);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4) 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border-light);
  transition: color var(--t-fast);
}

.mobile-nav__link:hover {
  color: var(--color-accent);
}

.mobile-nav__sub {
  display: none;
  flex-direction: column;
  padding-left: var(--sp-4);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--color-border-light);
}

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

.mobile-nav__sub-link {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--sp-3) 0;
  transition: color var(--t-fast);
  border-bottom: 1px solid var(--color-surface-2);
}

.mobile-nav__sub-link:hover {
  color: var(--color-accent);
}

.mobile-nav__cta {
  margin-top: auto;
  padding-top: var(--sp-8);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

/* ---- Responsive ---- */
@media (max-width: 1023px) {
  .site-nav {
    display: none;
  }

  .hamburger-btn {
    display: flex;
  }
}

@media (max-width: 767px) {
  .topbar__contacts .topbar__contact-item:nth-child(2) {
    display: none;
  }
}

@media (max-width: 479px) {
  .topbar__contacts {
    display: none;
  }

  .topbar__right {
    width: 100%;
    justify-content: space-between;
  }
}