/* AiFlo · site header
   Sticky top nav. White background, subtle border on scroll.
   `data-header` toggles `.is-scrolled` from main.js.
   Mobile: drawer triggered by `data-nav-toggle` -> `.is-open` on header. */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
  min-height: 72px;
}

/* Brand — real logo image (mark + wordmark in one file) */
.site-header__brand {
  display: inline-flex;
  align-items: center;
}
.site-header__brand img {
  height: 32px;
  width: auto;
  display: block;
}
.site-header__wordmark { display: none; }

/* Nav ------------------------------------------------------- */
.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--sp-7);
  flex: 1;
  justify-content: space-between;
  margin-left: var(--sp-7);
}

.site-header__list {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}
.site-header__list > li > a,
.site-header__menu-trigger {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-mid);
  padding: 8px 4px;
}
.site-header__list > li > a:hover,
.site-header__menu-trigger:hover { color: var(--color-primary); }

/* Use Cases dropdown ------------------------------------------- */
.site-header__item { position: relative; }
.site-header__item--has-menu { position: relative; }

.site-header__menu-trigger {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: 0;
  cursor: pointer;
}
.site-header__chevron {
  transition: transform var(--dur) var(--ease);
}
.site-header__menu-trigger[aria-expanded="true"] .site-header__chevron {
  transform: rotate(180deg);
}

.site-header__menu {
  position: absolute;
  top: calc(100% + 12px);
  left: -8px;
  min-width: 340px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--r-2xl);
  box-shadow: var(--shadow-xl);
  padding: 8px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  z-index: 60;
}
/* Invisible "bridge" above the menu so the cursor traveling from the
   Use Cases trigger down to a submenu item stays inside the hover area
   the whole way. Without this, the 12px gap between the trigger and
   the panel kills the :hover state mid-transit and the menu closes. */
.site-header__menu::before {
  content: "";
  position: absolute;
  top: -16px;
  left: 0;
  right: 0;
  height: 16px;
  pointer-events: auto;
}
.site-header__menu ul {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.site-header__menu a {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  color: var(--color-text);
  transition: background var(--dur) var(--ease);
}
.site-header__menu a:hover {
  background: var(--color-primary-tint-1);
  color: var(--color-text);
}
.site-header__menu-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--color-primary-tint-1);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.site-header__menu-icon i,
.site-header__menu-icon [data-lucide] { width: 18px; height: 18px; }
.site-header__menu-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.site-header__menu-title {
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.3;
}
.site-header__menu-sub {
  font-size: 12.5px;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Reveal on hover (desktop) and on aria-expanded (keyboard / click).
   `display: block !important` overrides the inline `style="display:none"`
   on the partial — that inline style is the safety net so the dropdown
   stays hidden even if CSS hasn't loaded yet (e.g. stale CDN cache). */
@media (hover: hover) {
  .site-header__item--has-menu:hover .site-header__menu,
  .site-header__item--has-menu:focus-within .site-header__menu {
    display: block !important;
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
}
.site-header__menu-trigger[aria-expanded="true"] + .site-header__menu {
  display: block !important;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.site-header__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}

/* Mobile toggle -------------------------------------------- */
.site-header__toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: var(--r-md);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.site-header__toggle-bar {
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.site-header.is-open .site-header__toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.site-header.is-open .site-header__toggle-bar:nth-child(2) { opacity: 0; }
.site-header.is-open .site-header__toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Responsive ------------------------------------------------ */
@media (max-width: 960px) {
  .site-header__toggle { display: inline-flex; }

  .site-header__nav {
    position: fixed;
    inset: 72px 0 0 0;
    margin: 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: var(--sp-7) var(--container-px);
    gap: var(--sp-6);
    transform: translateX(100%);
    transition: transform var(--dur-slow) var(--ease);
    overflow-y: auto;
  }
  .site-header.is-open .site-header__nav { transform: translateX(0); }

  .site-header__list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--sp-2);
  }
  .site-header__list > li > a,
  .site-header__menu-trigger {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    font-size: 18px;
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
  }

  /* Use Cases dropdown — inline expand inside the mobile drawer */
  .site-header__item--has-menu {
    flex-direction: column;
  }
  .site-header__menu {
    position: static;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    transition: none;
    background: var(--color-bg-soft);
    border: 0;
    box-shadow: none;
    border-radius: 0;
    padding: 4px 0;
    min-width: 0;
    margin: 0 -16px;
    padding-left: 16px;
    padding-right: 16px;
    display: none;
  }
  .site-header__menu-trigger[aria-expanded="true"] + .site-header__menu {
    display: block !important;
  }
  .site-header__menu a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
    background: transparent !important;
  }
  .site-header__menu li:last-child a { border-bottom: 0; }
  .site-header__menu-icon { display: none; }
  .site-header__menu-sub { display: none; }
  .site-header__menu-title { font-size: 16px; font-weight: 500; }

  .site-header__cta {
    flex-direction: column;
    align-items: stretch;
    gap: var(--sp-3);
  }
  .site-header__cta .btn--ghost,
  .site-header__cta .btn--primary { text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-header__nav,
  .site-header__toggle-bar { transition: none; }
}