/* ============================================================
   OIC Header – Professional Responsive Navigation
   ============================================================ */

:root {
  --header-bg: rgba(20, 60, 100, 0.92);
  --header-bg-scrolled: rgba(12, 40, 72, 0.97);
  --header-accent: #14abe3;
  --header-accent-hover: #0d8fc0;
  --header-text: #ffffff;
  --header-text-muted: rgba(255, 255, 255, 0.75);
  --header-dropdown-bg: #ffffff;
  --header-dropdown-text: #1e293b;
  --header-dropdown-hover: #f1f5f9;
  --header-dropdown-accent: #14abe3;
  --header-shadow: 0 2px 16px rgba(0, 0, 0, 0.12);
  --header-height: 64px;
  --header-font: 'Roboto', sans-serif;
  --header-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --header-radius: 8px;
  --header-z: 1000;
}

/* Base  */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: var(--header-z);
  box-shadow: var(--header-shadow);
  transition: background var(--header-transition), box-shadow var(--header-transition);
  font-family: var(--header-font);
}

.site-header.scrolled {
  background: var(--header-bg-scrolled);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Logo */
.site-header__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.site-header__logo-main {
  height: 38px;
  width: auto;
  object-fit: contain;
}

.site-header__logo-icon {
  height: 30px;
  width: auto;
  object-fit: contain;
}

/* Nav  */
.site-header__nav {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1 1 auto;
  min-width: 0;
  justify-content: center;
}

.site-header__nav > .nav-item {
  position: relative;
}

.site-header__nav > .nav-item > .nav-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 8px 14px;
  color: var(--header-text);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: 6px;
  transition: background var(--header-transition), color var(--header-transition);
  white-space: nowrap;
  cursor: pointer;
}

.site-header__nav > .nav-item > .nav-link:hover,
.site-header__nav > .nav-item > .nav-link:focus-visible {
  background: rgba(255, 255, 255, 0.12);
}

.site-header__nav > .nav-item > .nav-link .nav-chevron {
  font-size: 0.55rem;
  opacity: 0.6;
  transition: transform var(--header-transition);
}

.site-header__nav > .nav-item:hover > .nav-link .nav-chevron,
.site-header__nav > .nav-item.open > .nav-link .nav-chevron {
  transform: rotate(180deg);
}

/*   Dropdown (Level 1) */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 220px;
  background: var(--header-dropdown-bg);
  border-radius: var(--header-radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.04);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--header-transition), transform var(--header-transition), visibility var(--header-transition);
  z-index: 10;
  list-style: none;
  margin: 0;
}

.nav-item:hover > .nav-dropdown,
.nav-item.open > .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/*   Dropdown Items                       */
.nav-dropdown .nav-item {
  position: relative;
}

.nav-dropdown .nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 14px;
  color: var(--header-dropdown-text);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 450;
  border-radius: 6px;
  transition: background var(--header-transition), color var(--header-transition);
  cursor: pointer;
  white-space: nowrap;
}

.nav-dropdown .nav-link:hover,
.nav-dropdown .nav-link:focus-visible {
  background: var(--header-dropdown-hover);
  color: var(--header-dropdown-accent);
}

.nav-dropdown .nav-link .nav-chevron {
  font-size: 0.5rem;
  opacity: 0.4;
  transition: transform var(--header-transition), opacity var(--header-transition);
}

.nav-dropdown .nav-item:hover > .nav-link .nav-chevron {
  opacity: 0.8;
  transform: translateX(2px);
}

/*   Nested Dropdown (Level 2+)                 */
.nav-dropdown .nav-dropdown {
  top: -6px;
  left: calc(100% + 4px);
  transform: translateX(8px);
}

.nav-dropdown .nav-item:hover > .nav-dropdown,
.nav-dropdown .nav-item.open > .nav-dropdown {
  transform: translateX(0);
}

/*   Hamburger Toggle                      */
.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  gap: 5px;
  border-radius: 6px;
  transition: background var(--header-transition);
}

.site-header__toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

.site-header__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--header-text);
  border-radius: 2px;
  transition: transform var(--header-transition), opacity var(--header-transition);
}

.site-header__toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header__toggle.active span:nth-child(2) {
  opacity: 0;
}

.site-header__toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/*   Mobile Overlay                       */
.site-header__overlay {
  display: none;
}

/*   Close button (hidden on desktop)              */
.site-header__nav-close {
  display: none;
  list-style: none;
}

/*   Language Selector (injected by translator.js)      */
.site-header #lang-selector {
  margin-left: 8px;
  flex-shrink: 0;
  position: relative;
  z-index: 5;
  min-width: fit-content;
}

/* ============================================================
   Responsive – Mobile (≤ 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .site-header__toggle {
    display: flex;
  }

  .site-header__overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: -1;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--header-transition), visibility var(--header-transition);
  }

  .site-header__overlay.active {
    opacity: 1;
    visibility: visible;
  }

  .site-header__toggle {
    position: relative;
    z-index: calc(var(--header-z) + 2);
  }

  .site-header__toggle.active {
    display: none;
  }

  .site-header__nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    max-width: 85vw;
    height: 100dvh;
    background: var(--header-bg-scrolled);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 16px 24px;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--header-transition);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.2);
    z-index: calc(var(--header-z) + 1);
  }

  .site-header__nav.mobile-open {
    transform: translateX(0);
  }

  /* Close button inside mobile nav */
  .site-header__nav-close {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 8px 8px 16px;
    flex-shrink: 0;
  }

  .site-header__nav-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    cursor: pointer;
    color: var(--header-text);
    font-size: 1.1rem;
    transition: background var(--header-transition), transform var(--header-transition);
  }

  .site-header__nav-close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
  }

  .site-header__nav > .nav-item > .nav-link {
    padding: 12px 16px;
    font-size: 0.9rem;
    border-radius: var(--header-radius);
  }

  /* Mobile dropdowns as accordion */
  .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--header-radius);
    padding: 4px 0 4px 12px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.3s ease;
  }

  .nav-item.open > .nav-dropdown {
    max-height: 2000px;
    padding: 4px 0 4px 12px;
  }

  .nav-dropdown .nav-dropdown {
    top: 0;
    left: 0;
  }

  .nav-dropdown .nav-link {
    color: var(--header-text-muted);
    padding: 10px 14px;
    font-size: 0.82rem;
  }

  .nav-dropdown .nav-link:hover,
  .nav-dropdown .nav-link:focus-visible {
    background: rgba(255, 255, 255, 0.08);
    color: var(--header-text);
  }

  .nav-dropdown .nav-link .nav-chevron {
    color: var(--header-text-muted);
    transition: transform var(--header-transition);
  }

  .nav-item.open > .nav-link .nav-chevron {
    transform: rotate(90deg) !important;
  }

  /* Hide hover interaction on touch */
  .nav-item:hover > .nav-dropdown {
    max-height: 0;
    padding: 4px 0 4px 12px;
  }

  .nav-item.open > .nav-dropdown {
    max-height: 2000px;
  }

  .nav-item:hover > .nav-dropdown {
    opacity: 1;
    visibility: visible;
  }
}

/*   Micro adjustments for very small screens          */
@media (max-width: 480px) {
  .site-header__inner {
    padding: 0 16px;
  }

  .site-header__logo-main {
    height: 30px;
  }

  .site-header__logo-icon {
    height: 24px;
  }
}