/* ─────────────────────────────────────────────────────────────────────────
   TCI shared navigation styles
   ─────────────────────────────────────────────────────────────────────────
   Light header matching the visual mood of tci.edu.ua:
     white background, dark body text, subtle dropdown chevrons,
     inline SVG logo (no extra request), hover in a muted burgundy accent.

   ~4 KB minified / ~1.6 KB gzip. No runtime JS required for rendering —
   the tiny nav.js only powers the burger menu and scroll shadow.
   ────────────────────────────────────────────────────────────────────────── */

:root {
  /* Palette */
  --tci-nav-bg:        #FFFFFF;
  --tci-nav-bg-scrl:   rgba(255, 255, 255, 0.94);
  --tci-nav-fg:        #1F1F24;         /* near-black body text */
  --tci-nav-fg-muted:  rgba(31, 31, 36, 0.72);
  --tci-nav-accent:    #7A1E2B;         /* muted burgundy, hover/current */
  --tci-nav-hover-bg:  rgba(122, 30, 43, 0.06);
  --tci-nav-border:    rgba(0, 0, 0, 0.08);
  --tci-nav-panel-bg:  #FFFFFF;
  --tci-nav-panel-sh:  0 14px 32px rgba(0, 0, 0, 0.10);

  /* Type */
  --tci-nav-font:      'Roboto', 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --tci-nav-font-link: 15px;
  --tci-nav-font-sub:  14px;

  /* Layout */
  --tci-nav-h:         84px;
  --tci-nav-pad-x:     clamp(12px, 2.4vw, 40px);
}

/* ── Reset inside the nav ───────────────────────────────────────────────── */
.tci-nav,
.tci-nav * {
  box-sizing: border-box;
}

/* ── Container ──────────────────────────────────────────────────────────── */
.tci-nav {
  position: sticky;
  top: 0;
  z-index: 100;

  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: clamp(16px, 2vw, 32px);

  width: 100%;
  min-height: var(--tci-nav-h);
  padding: 14px var(--tci-nav-pad-x);

  background: var(--tci-nav-bg);
  color: var(--tci-nav-fg);
  border-bottom: 1px solid var(--tci-nav-border);
  font-family: var(--tci-nav-font);
  font-weight: 400;
  line-height: 1.3;
}
.tci-nav.is-scrolled {
  background: var(--tci-nav-bg-scrl);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
}

/* ── Logo ───────────────────────────────────────────────────────────────── */
.tci-nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--tci-nav-fg);
  flex: 0 0 auto;
}
.tci-nav__logo-svg {
  display: block;
  height: 44px;
  width: auto;
  color: var(--tci-nav-fg); /* SVG uses currentColor */
}
.tci-nav__logo:hover .tci-nav__logo-svg {
  color: var(--tci-nav-accent);
  transition: color 160ms ease;
}
.tci-nav__logo-img {
  display: block;
  height: 52px;
  width: auto;
  max-width: 240px;
  object-fit: contain;
}
.tci-nav__logo-text {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* ── Menu wrapper (WP wraps wp_nav_menu output in <nav>) ────────────────── */
.tci-nav__menu {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  justify-content: flex-start;
  min-width: 0;
  padding-left: clamp(16px, 3vw, 40px);
}

/* ── Top-level list ─────────────────────────────────────────────────────── */
.tci-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}

/* Items */
.tci-nav__list > li,
.tci-nav__list .menu-item {
  position: relative;
  display: block;
}

.tci-nav__list > li > a,
.tci-nav__list .menu-item > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 10px;
  text-decoration: none;
  color: var(--tci-nav-fg);
  font-size: var(--tci-nav-font-link);
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: 4px;
  transition: color 160ms ease, background-color 160ms ease;
  white-space: nowrap;
}
.tci-nav__list > li > a:hover,
.tci-nav__list .menu-item > a:hover,
.tci-nav__list .menu-item-has-children:hover > a {
  color: var(--tci-nav-accent);
  background-color: var(--tci-nav-hover-bg);
}

/* Dropdown chevron for items with children */
.tci-nav__list .menu-item-has-children > a::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-left: 2px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  opacity: 0.6;
  transition: transform 160ms ease, opacity 160ms ease;
}
.tci-nav__list .menu-item-has-children:hover > a::after,
.tci-nav__list .menu-item-has-children:focus-within > a::after {
  transform: rotate(-135deg) translateY(-2px);
  opacity: 1;
}

/* Current page */
.tci-nav__list .current-menu-item > a,
.tci-nav__list .current_page_item > a,
.tci-nav__list .current-menu-ancestor > a {
  color: var(--tci-nav-accent);
  font-weight: 600;
}

/* ── Submenu (depth 2) ──────────────────────────────────────────────────── */
.tci-nav__list .sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 260px;
  margin: 0;
  padding: 8px;
  list-style: none;

  background: var(--tci-nav-panel-bg);
  border: 1px solid var(--tci-nav-border);
  border-radius: 6px;
  box-shadow: var(--tci-nav-panel-sh);

  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity 160ms ease,
    transform 160ms ease,
    visibility 0s linear 160ms;
  z-index: 110;
}
.tci-nav__list .menu-item-has-children:hover > .sub-menu,
.tci-nav__list .menu-item-has-children:focus-within > .sub-menu,
.tci-nav__list .menu-item-has-children.is-open > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s, 0s, 0s;
}
.tci-nav__list .sub-menu .menu-item {
  display: block;
}
.tci-nav__list .sub-menu .menu-item > a {
  display: block;
  padding: 9px 12px;
  font-size: var(--tci-nav-font-sub);
  font-weight: 400;
  color: var(--tci-nav-fg-muted);
  border-radius: 4px;
  white-space: normal;
}
.tci-nav__list .sub-menu .menu-item > a:hover {
  background: var(--tci-nav-hover-bg);
  color: var(--tci-nav-accent);
}

/* ── Burger (hidden on desktop) ─────────────────────────────────────────── */
.tci-nav__burger {
  display: none;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;

  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--tci-nav-border);
  border-radius: 6px;
  color: var(--tci-nav-fg);
  cursor: pointer;

  position: relative;
}
.tci-nav__burger span {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 200ms ease, opacity 200ms ease, top 200ms ease;
}
.tci-nav__burger span:nth-child(1) { top: 14px; }
.tci-nav__burger span:nth-child(2) { top: 21px; }
.tci-nav__burger span:nth-child(3) { top: 28px; }

.tci-nav__burger[aria-expanded="true"] span:nth-child(1) {
  top: 21px;
  transform: rotate(45deg);
}
.tci-nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.tci-nav__burger[aria-expanded="true"] span:nth-child(3) {
  top: 21px;
  transform: rotate(-45deg);
}

/* ── Fallback variant (when WP unreachable) ─────────────────────────────── */
.tci-nav--fallback {
  outline: 1px dashed var(--tci-nav-accent);
  outline-offset: -1px;
}

/* ── Hydrating state (before middleware/JS fills content) ───────────────── */
#tci-nav-root[aria-busy="true"] {
  min-height: var(--tci-nav-h);
  background: var(--tci-nav-bg);
  border-bottom: 1px solid var(--tci-nav-border);
}

/* ─────────────────────────────────────────────────────────────────────────
   Responsive: below 1024px show burger, fold menu into slide-down panel.
   ────────────────────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .tci-nav {
    padding-left: 12px;
    padding-right: 12px;
    gap: 8px;
    justify-content: space-between;
  }
  .tci-nav__burger {
    display: inline-flex;
    margin-left: auto;
  }

  .tci-nav__menu {
    padding-left: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 8px var(--tci-nav-pad-x) 20px;
    background: var(--tci-nav-bg);
    border-bottom: 1px solid var(--tci-nav-border);
    max-height: calc(100vh - var(--tci-nav-h));
    overflow-y: auto;

    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition:
      opacity 180ms ease,
      transform 180ms ease,
      visibility 0s linear 180ms;
  }
  .tci-nav:has(.tci-nav__burger[aria-expanded="true"]) .tci-nav__menu,
  .tci-nav__menu.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0s, 0s, 0s;
  }

  .tci-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }
  .tci-nav__list > li { width: 100%; }
  .tci-nav__list > li > a {
    padding: 14px 10px;
    border-radius: 4px;
    border-bottom: 1px solid var(--tci-nav-border);
  }
  .tci-nav__list > li:last-child > a { border-bottom: 0; }
  .tci-nav__list > li.menu-item-has-children.is-open > a {
    color: var(--tci-nav-accent);
    background-color: var(--tci-nav-hover-bg);
  }

  .tci-nav__list .sub-menu {
    position: static;
    box-shadow: none;
    border: 0;
    background: transparent;
    padding: 0 0 0 16px;
    min-width: 0;

    /* collapsed by default on mobile */
    opacity: 1;
    visibility: visible;
    transform: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height 240ms ease;
  }
  .tci-nav__list .menu-item-has-children.is-open > .sub-menu {
    max-height: 800px;
    padding: 4px 0 10px 16px;
  }
  .tci-nav__list .sub-menu .menu-item > a {
    padding: 8px 10px;
    color: var(--tci-nav-fg-muted);
    border-bottom: 0;
  }

  /* chevron on mobile — bigger tap area, rotates when open */
  .tci-nav__list .menu-item-has-children > a::after {
    margin-left: auto;
    width: 9px;
    height: 9px;
    opacity: 0.55;
  }
  .tci-nav__list .menu-item-has-children.is-open > a::after {
    transform: rotate(-135deg) translateY(-2px);
    opacity: 1;
  }

  .tci-nav__logo-svg { height: 38px; }
}

/* ── Prefers reduced motion ─────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .tci-nav *,
  .tci-nav *::before,
  .tci-nav *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}