/**
 * Header navigation — dropdown sub-menus + working mobile toggle.
 *
 * Layers onto the existing `.nav-menu` rules in style.css (flex row, `.nav-menu a`
 * = #091833 / 18px, `.header-btn` pill). Only NEW selectors are used
 * (`.nav-item`, `.has-submenu`, `.sub-menu`, `.menu-toggle.is-active`,
 * `.nav-menu.is-open`), so pages using the old flat menu are unaffected. The menu
 * itself is built and ordered from Appearance → Menus; drag an item under another
 * to create a dropdown. Behaviour (mobile open + submenu accordion) is in
 * theme.js → initHeaderNav().
 */

/* A top-level item that owns a dropdown. */
.nav-menu .nav-item.has-submenu {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.nav-menu .nav-item.has-submenu > a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

/* Caret — a rotating chevron drawn with borders. */
.nav-menu .submenu-caret {
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

/* The dropdown panel. */
.nav-menu .sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  margin: 0;
  padding: 10px;
  list-style: none;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 18px 44px rgba(9, 24, 51, 0.14);
  border: 1px solid #eef0fa;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  z-index: 200;
}

/* A small hover bridge so the pointer can cross the gap to the panel. */
.nav-menu .nav-item.has-submenu::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  height: 16px;
}

.nav-menu .sub-menu-item {
  margin: 0;
  list-style: none;
}

.nav-menu .sub-menu-item a {
  display: block;
  width: 100%;
  padding: 11px 14px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.4;
  color: #091833;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-menu .sub-menu-item a:hover {
  background: #eef0fa;
  color: #4349ed;
}

/* Desktop reveal — hover or keyboard focus within the item. */
@media (min-width: 992px) {
  .nav-menu .nav-item.has-submenu:hover > a .submenu-caret,
  .nav-menu .nav-item.has-submenu:focus-within > a .submenu-caret {
    transform: translateY(1px) rotate(225deg);
  }

  .nav-menu .nav-item.has-submenu:hover > .sub-menu,
  .nav-menu .nav-item.has-submenu:focus-within > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

/* ── Mobile (≤ 991px) ────────────────────────────────────────────────────── */
@media (max-width: 991px) {
  /* JS reveals the panel by adding .is-open to .nav-menu. */
  .nav-menu.is-open {
    display: flex;
  }

  .nav-menu .nav-item.has-submenu {
    display: block;
    width: 100%;
  }

  .nav-menu .nav-item.has-submenu > a {
    width: 100%;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid #eef1f5;
  }

  /* Static accordion instead of an absolute dropdown. */
  .nav-menu .sub-menu {
    position: static;
    opacity: 1;
    visibility: hidden;
    transform: none;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 0 0 6px 12px;
    min-width: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.28s ease, visibility 0.28s;
  }

  .nav-menu .nav-item.has-submenu.is-open > .sub-menu {
    visibility: visible;
    max-height: 480px;
  }

  .nav-menu .nav-item.has-submenu.is-open > a .submenu-caret {
    transform: translateY(1px) rotate(225deg);
  }

  .nav-menu .sub-menu-item a {
    padding: 12px 0;
    border-bottom: 1px solid #f1f3f8;
    white-space: normal;
  }

  /* Hamburger → X when open. */
  .menu-toggle.is-active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .menu-toggle.is-active span:nth-child(2) {
    opacity: 0;
  }
  .menu-toggle.is-active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}