/* ============================================================================
   MITCON Credensia — Navbar Component
   ----------------------------------------------------------------------------
   Mobile-first. Three breakpoint behaviors:
     - Mobile (<1024px):  hamburger toggle, full-screen overlay menu
     - Desktop (≥1024px): horizontal menu bar with hover/click dropdowns
     - High contrast / reduced motion: respected at token level
   ============================================================================ */

/* ============================================================================
   1. NAVBAR SHELL
   ============================================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-navbar);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-grey-light);
  height: var(--navbar-height-mobile);
  transition: box-shadow var(--duration-base) var(--ease-out),
              background-color var(--duration-base) var(--ease-out);
}

@media (min-width: 64em) {
  .navbar {
    height: var(--navbar-height-desktop);
  }
}

/* Scroll-triggered shadow (added by JS via .is-scrolled) */
.navbar.is-scrolled {
  box-shadow: var(--shadow-md);
}

.navbar__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-4);
}

/* ============================================================================
   2. LOGO
   ============================================================================ */
.navbar__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  /* Adequate touch target without padding shrinking it visually */
  padding-block: var(--space-2);
}

.navbar__logo:focus-visible {
  outline: var(--focus-ring-width) var(--focus-ring-style) var(--color-focus-ring);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

.navbar__logo-img {
  height: 32px;
  width: auto;
  display: block;
}

@media (min-width: 64em) {
  .navbar__logo-img {
    height: 40px;
  }
}

/* ============================================================================
   3. MOBILE HAMBURGER (visible <1024px)
   ============================================================================ */
.navbar__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;                          /* WCAG 2.5.5 touch target */
  min-height: 44px;
  padding: var(--space-2);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-dark);
  transition: var(--transition-color);
}

.navbar__toggle:hover {
  background-color: var(--color-grey-lighter);
}

.navbar__toggle:focus-visible {
  outline: var(--focus-ring-width) var(--focus-ring-style) var(--color-focus-ring);
  outline-offset: var(--focus-ring-offset);
}

.navbar__toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
}

.navbar__toggle-bars span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out);
  transform-origin: center;
}

/* When menu open — bars morph into × */
.navbar__toggle[aria-expanded="true"] .navbar__toggle-bars span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bars span:nth-child(2) {
  opacity: 0;
}

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bars span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

@media (min-width: 64em) {
  .navbar__toggle {
    display: none;
  }
}

/* ============================================================================
   4. PRIMARY MENU LIST
   ----------------------------------------------------------------------------
   Mobile: full-screen overlay panel sliding from right
   Desktop: horizontal flex bar
   ============================================================================ */
.navbar__menu {
  /* MOBILE base — hidden off-canvas */
  position: fixed;
  top: var(--navbar-height-mobile);
  right: 0;
  width: min(85vw, 380px);
  height: calc(100dvh - var(--navbar-height-mobile));
  padding: var(--space-6) var(--space-4);
  margin: 0;
  list-style: none;

  background-color: var(--color-bg);
  border-left: 1px solid var(--color-grey-light);
  box-shadow: var(--shadow-xl);

  display: flex;
  flex-direction: column;
  gap: var(--space-1);

  overflow-y: auto;
  overscroll-behavior: contain;             /* prevent body scroll bleed */

  transform: translateX(100%);
  transition: transform var(--duration-base) var(--ease-out);
  visibility: hidden;
}

.navbar__menu.is-open {
  transform: translateX(0);
  visibility: visible;
}

@media (min-width: 64em) {
  .navbar__menu {
    /* DESKTOP — reset to inline horizontal */
    position: static;
    top: auto;
    right: auto;
    width: auto;
    height: auto;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;

    flex-direction: row;
    align-items: center;
    gap: var(--space-1);

    transform: none;
    visibility: visible;
    overflow: visible;
  }
}

/* ============================================================================
   5. PRIMARY MENU ITEMS + LINKS
   ============================================================================ */
.navbar__item {
  position: relative;
}

.navbar__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--color-dark);
  text-decoration: none;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-color);
  width: 100%;
  text-align: left;
}

@media (min-width: 64em) {
  .navbar__link {
    width: auto;
  }
}

.navbar__link:hover,
.navbar__link:focus-visible {
  color: var(--color-primary);
  background-color: var(--color-primary-lighter);
}

.navbar__link:focus-visible {
  outline: var(--focus-ring-width) var(--focus-ring-style) var(--color-focus-ring);
  outline-offset: -2px;
}

/* Active link (current page) */
.navbar__link.is-active,
.navbar__link[aria-current="page"] {
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
}

.navbar__link.is-active::after {
  content: "";
  position: absolute;
  left: var(--space-4);
  right: var(--space-4);
  bottom: 4px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

@media (max-width: 63.9375em) {
  .navbar__link.is-active::after {
    display: none;                          /* mobile: don't show underline */
  }
  .navbar__link.is-active {
    border-left: 3px solid var(--color-primary);
    background-color: var(--color-primary-lighter);
  }
}

/* Caret icon */
.navbar__caret {
  flex-shrink: 0;
  transition: transform var(--duration-fast) var(--ease-out);
}

[aria-expanded="true"] > .navbar__caret {
  transform: rotate(180deg);
}

/* Right-pointing caret (used in submenu) doesn't rotate vertically */
[aria-expanded="true"] > .navbar__caret--right {
  transform: rotate(90deg);
}

/* ============================================================================
   6. DROPDOWN MENU (level 2)
   ----------------------------------------------------------------------------
   Mobile: accordion-style — pushes content below
   Desktop: floating panel below trigger
   ============================================================================ */
.navbar__dropdown {
  list-style: none;
  padding: 0;
  margin: 0;

  /* MOBILE: collapsible accordion */
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-base) var(--ease-out);
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
}

[data-dropdown].is-open > .navbar__dropdown {
  max-height: 600px;                        /* big enough; transitions cap auto */
  margin-top: var(--space-1);
  margin-bottom: var(--space-2);
}

@media (min-width: 64em) {
  .navbar__dropdown {
    /* DESKTOP: floating panel, hidden by default */
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 260px;
    padding: var(--space-2);
    margin: 0;

    background-color: var(--color-bg);
    border: 1px solid var(--color-grey-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);

    /* Replace mobile accordion behavior with hide/show */
    max-height: none;
    overflow: visible;

    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--duration-fast) var(--ease-out),
                transform var(--duration-fast) var(--ease-out),
                visibility 0s linear var(--duration-fast);
  }

  [data-dropdown].is-open > .navbar__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity var(--duration-fast) var(--ease-out),
                transform var(--duration-fast) var(--ease-out),
                visibility 0s linear 0s;
  }

  /* Wide dropdown — for Services with two columns */
  .navbar__dropdown--wide {
    min-width: 560px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
    padding: var(--space-4);
  }

  /* Right-edge dropdowns flip to align right (prevents viewport overflow) */
  .navbar__item:nth-last-child(-n+2) > .navbar__dropdown {
    left: auto;
    right: 0;
  }
}

.navbar__dropdown-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-sm);
  color: var(--color-dark);
  text-decoration: none;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: var(--transition-color);
}

.navbar__dropdown-link:hover,
.navbar__dropdown-link:focus-visible {
  background-color: var(--color-primary-lighter);
  color: var(--color-primary);
}

.navbar__dropdown-link:focus-visible {
  outline: var(--focus-ring-width) var(--focus-ring-style) var(--color-focus-ring);
  outline-offset: -2px;
}

/* Dropdown group (used in services for SEBI/Non-SEBI columns) */
.navbar__dropdown-group {
  list-style: none;
}

.navbar__dropdown-heading {
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-grey-light);
  margin-bottom: var(--space-1);
}

/* ============================================================================
   7. SUBMENU (level 3 — used in About → Downloads, Disclosure → Press Release)
   ============================================================================ */
.navbar__submenu {
  list-style: none;
  padding: 0;
  margin: 0;

  /* MOBILE: accordion */
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-base) var(--ease-out);
  padding-left: var(--space-4);
}

[data-submenu].is-open > .navbar__submenu {
  max-height: 400px;
}

@media (min-width: 64em) {
  .navbar__submenu {
    /* DESKTOP: floats to the right of parent dropdown item */
    position: absolute;
    top: 0;
    left: 100%;
    min-width: 240px;
    padding: var(--space-2);
    margin-left: var(--space-1);

    background-color: var(--color-bg);
    border: 1px solid var(--color-grey-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);

    max-height: none;
    overflow: visible;

    opacity: 0;
    visibility: hidden;
    transform: translateX(-8px);
    transition: opacity var(--duration-fast) var(--ease-out),
                transform var(--duration-fast) var(--ease-out),
                visibility 0s linear var(--duration-fast);
  }

  [data-submenu].is-open > .navbar__submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
    transition: opacity var(--duration-fast) var(--ease-out),
                transform var(--duration-fast) var(--ease-out),
                visibility 0s linear 0s;
  }

  .navbar__dropdown-item--has-submenu {
    position: relative;
  }
}

/* ============================================================================
   8. CTA BUTTON IN NAVBAR
   ============================================================================ */
.navbar__item--cta {
  margin-top: var(--space-4);
}

@media (min-width: 64em) {
  .navbar__item--cta {
    margin-top: 0;
    margin-left: var(--space-2);
  }
}

.navbar__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-accent);
  color: var(--color-text-on-accent);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  border-radius: var(--radius-full);
  white-space: nowrap;
  width: 100%;
  transition: var(--transition-color), transform var(--duration-fast) var(--ease-out);
}

@media (min-width: 64em) {
  .navbar__cta {
    width: auto;
  }
}

.navbar__cta:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
}

.navbar__cta:focus-visible {
  outline: var(--focus-ring-width) var(--focus-ring-style) var(--color-focus-ring);
  outline-offset: var(--focus-ring-offset);
}

/* ============================================================================
   9. MOBILE BACKDROP
   ============================================================================ */
.navbar__backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  z-index: calc(var(--z-navbar) - 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-base) var(--ease-out),
              visibility 0s linear var(--duration-base);
}

.navbar__backdrop.is-visible {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--duration-base) var(--ease-out),
              visibility 0s linear 0s;
}

@media (min-width: 64em) {
  .navbar__backdrop {
    display: none;
  }
}

/* ============================================================================
   10. BODY LOCK WHEN MENU OPEN (prevents background scrolling)
   ============================================================================ */
body.is-menu-open {
  overflow: hidden;
}

@media (min-width: 64em) {
  body.is-menu-open {
    overflow: auto;                         /* desktop dropdowns don't lock scroll */
  }
}