/* ============================================================
   MMT ALLIANCE — Navigation Styles
   ============================================================ */

/* --- Variables --- */
:root {
  --nav-height: 72px;
  --nav-bg: rgba(255, 255, 255, 0.97);
  --nav-bg-scrolled: rgba(255, 255, 255, 1);
  --nav-shadow: 0 1px 0 rgba(0,0,0,0.08);
  --nav-shadow-scrolled: 0 4px 24px rgba(0,0,0,0.10);
  --nav-link-color: #1a2340;
  --nav-link-hover: #0a5dc2;
  --nav-active-color: #0a5dc2;
  --nav-active-bg: rgba(10, 93, 194, 0.07);
  --nav-cta-bg: #0a5dc2;
  --nav-cta-hover: #0847a0;
  --nav-cta-color: #fff;
  --dropdown-bg: #ffffff;
  --dropdown-shadow: 0 8px 40px rgba(10,35,80,0.13), 0 2px 8px rgba(10,35,80,0.07);
  --dropdown-border: rgba(10, 93, 194, 0.10);
  --submenu-bg: #f4f7fd;
  --font-nav: 'DM Sans', 'Segoe UI', system-ui, sans-serif;
  --transition-fast: 160ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-smooth: 280ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --mobile-breakpoint: 900px;
}

/* ============================================================
   BASE RESET / BODY LOCK
   ============================================================ */
body.menu-open {
  overflow: hidden;
}

/* ============================================================
   HEADER
   ============================================================ */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--nav-bg);
  box-shadow: var(--nav-shadow);
  transition: 
    background var(--transition-smooth),
    box-shadow var(--transition-smooth),
    height var(--transition-smooth);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

#site-header.scrolled {
  background: var(--nav-bg-scrolled);
  box-shadow: var(--nav-shadow-scrolled);
  height: 64px;
}

/* ============================================================
   NAV CONTAINER
   ============================================================ */
.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 0;
  position: relative;
}

/* ============================================================
   LOGO
   ============================================================ */
.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
  margin-right: auto;
  outline: none;
}

.logo-img {
  height: 98px;
  width: auto;
  display: block;
  transition: opacity var(--transition-fast);
}

.logo-img:hover { opacity: 0.85; }

.logo-fallback {
  display: flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-nav);
  font-weight: 800;
  letter-spacing: -0.5px;
}

.logo-text-main {
  font-size: 22px;
  color: var(--nav-link-color);
}

.logo-text-sub {
  font-size: 14px;
  font-weight: 600;
  color: var(--nav-active-color);
  letter-spacing: 1.5px;
}

/* ============================================================
   NAV LINKS (DESKTOP)
   ============================================================ */
.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 2px;
  height: 100%;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  font-family: var(--font-nav);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--nav-link-color);
  text-decoration: none;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
  letter-spacing: -0.1px;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--nav-active-color);
  background: var(--nav-active-bg);
}

.nav-link[aria-current="page"],
.nav-link.active {
  color: var(--nav-active-color);
  background: var(--nav-active-bg);
  font-weight: 600;
}

/* CTA Button */
.nav-link.nav-cta {
  background: var(--nav-cta-bg);
  color: var(--nav-cta-color) !important;
  padding: 8px 20px;
  font-weight: 600;
  border-radius: 8px;
  margin-left: 6px;
  box-shadow: 0 2px 10px rgba(10, 93, 194, 0.25);
  transition: background var(--transition-fast), 
              box-shadow var(--transition-fast),
              transform var(--transition-fast);
}

.nav-link.nav-cta:hover,
.nav-link.nav-cta:focus-visible {
  background: var(--nav-cta-hover);
  box-shadow: 0 4px 16px rgba(10, 93, 194, 0.35);
  transform: translateY(-1px);
  color: var(--nav-cta-color) !important;
}

/* Chevron icon */
.chevron-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  transition: transform var(--transition-smooth);
  opacity: 0.6;
}

/* ============================================================
   DROPDOWN — LEVEL 1 (DESKTOP)
   ============================================================ */
.nav-dropdown {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

/* The dropdown panel — hidden by default */
.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 240px;
  background: var(--dropdown-bg);
  border: 1px solid var(--dropdown-border);
  border-radius: var(--radius-md);
  box-shadow: var(--dropdown-shadow);
  list-style: none;
  padding: 6px;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: 
    opacity var(--transition-smooth),
    transform var(--transition-smooth),
    visibility var(--transition-smooth);
  z-index: 200;
}

/* Show on hover (desktop only) */
@media (min-width: 901px) {
  .nav-dropdown:hover > .dropdown-menu,
  .nav-dropdown:focus-within > .dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
  }

  .nav-dropdown:hover > .dropdown-trigger .chevron-icon,
  .nav-dropdown:focus-within > .dropdown-trigger .chevron-icon {
    transform: rotate(180deg);
    opacity: 1;
  }
}

/* Dropdown items */
.dropdown-item {
  position: relative;
  border-radius: var(--radius-sm);
}

.dropdown-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 12px;
  font-family: var(--font-nav);
  font-size: 14px;
  font-weight: 500;
  color: var(--nav-link-color);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

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

/* Arrow for submenu items */
.submenu-arrow {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  opacity: 0.45;
  transition: transform var(--transition-smooth), opacity var(--transition-fast);
}

/* ============================================================
   SUBMENU — LEVEL 2 (DESKTOP)
   ============================================================ */
.submenu {
  position: absolute;
  top: 0;
  left: calc(100% + 6px);
  min-width: 220px;
  background: var(--dropdown-bg);
  border: 1px solid var(--dropdown-border);
  border-radius: var(--radius-md);
  box-shadow: var(--dropdown-shadow);
  list-style: none;
  padding: 6px;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: 
    opacity var(--transition-smooth),
    transform var(--transition-smooth),
    visibility var(--transition-smooth);
  transform: translateX(-4px);
  z-index: 300;
}

@media (min-width: 901px) {
  .dropdown-item.has-submenu:hover > .submenu,
  .dropdown-item.has-submenu:focus-within > .submenu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(0);
  }

  .dropdown-item.has-submenu:hover > .submenu-trigger .submenu-arrow,
  .dropdown-item.has-submenu:focus-within > .submenu-trigger .submenu-arrow {
    transform: translateX(2px);
    opacity: 0.9;
  }
}

.submenu-link {
  display: block;
  padding: 8px 12px;
  font-family: var(--font-nav);
  font-size: 13.5px;
  font-weight: 400;
  color: #3d4f70;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast), padding-left var(--transition-fast);
}

.submenu-link:hover,
.submenu-link:focus-visible {
  color: var(--nav-active-color);
  background: var(--nav-active-bg);
  padding-left: 16px;
}

/* ============================================================
   BACKDROP (MOBILE)
   ============================================================ */
.nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 20, 50, 0.45);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

/* ============================================================
   MOBILE TOGGLE — UNIQUE DESIGN
   ============================================================ */
.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1010;
  border-radius: 12px;
  transition: background var(--transition-fast);
  flex-shrink: 0;
  outline: none;
}

.nav-toggle:focus-visible {
  box-shadow: 0 0 0 3px rgba(10, 93, 194, 0.35);
}

/* The unique toggle icon: morphing grid → X */
.nav-toggle-inner {
  position: relative;
  width: 22px;
  height: 22px;
  margin: auto;
}

/* Four square dots that morph into an X */
.nav-toggle-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--nav-link-color);
  border-radius: 2px;
  transition: 
    transform 320ms cubic-bezier(0.68, -0.55, 0.265, 1.55),
    border-radius 280ms ease,
    opacity 200ms ease,
    background 200ms ease;
}

/* 2×2 grid positions */
.nav-toggle-dot:nth-child(1) { top: 0;    left: 0; }
.nav-toggle-dot:nth-child(2) { top: 0;    right: 0; }
.nav-toggle-dot:nth-child(3) { bottom: 0; left: 0; }
.nav-toggle-dot:nth-child(4) { bottom: 0; right: 0; }

/* Hover: subtle color shift */
.nav-toggle:hover .nav-toggle-dot {
  background: var(--nav-active-color);
}

/* Open state: dots rotate to form an X */
.nav-toggle[aria-expanded="true"] {
  background: var(--nav-active-bg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-dot:nth-child(1) {
  transform: translate(7px, 7px) rotate(45deg);
  border-radius: 2px;
  width: 10px;
  height: 2.5px;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-dot:nth-child(2) {
  transform: translate(-7px, 7px) rotate(-45deg);
  border-radius: 2px;
  width: 10px;
  height: 2.5px;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-dot:nth-child(3) {
  transform: translate(7px, -7px) rotate(-45deg);
  border-radius: 2px;
  width: 10px;
  height: 2.5px;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-dot:nth-child(4) {
  transform: translate(-7px, -7px) rotate(45deg);
  border-radius: 2px;
  width: 10px;
  height: 2.5px;
}

/* ============================================================
   MOBILE STYLES
   ============================================================ */
@media (max-width: 900px) {

  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 8px;
  }

  /* Full-screen slide-in panel */
  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(340px, 88vw);
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: calc(var(--nav-height) + 16px) 16px 32px;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 999;
    box-shadow: -8px 0 48px rgba(10, 20, 60, 0.14);
    transform: translateX(100%);
    transition: transform 320ms cubic-bezier(0.32, 0.72, 0, 1);
    height: 100dvh;
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-backdrop {
    display: block;
  }

  body.menu-open .nav-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  /* Each top-level item */
  .nav-links > li {
    border-bottom: 1px solid rgba(10, 35, 80, 0.07);
  }

  .nav-links > li:last-child {
    border-bottom: none;
    margin-top: 12px;
    padding-top: 4px;
  }

  .nav-link {
    display: flex;
    width: 100%;
    padding: 13px 10px;
    font-size: 15px;
    border-radius: 10px;
    justify-content: space-between;
  }

  /* CTA on mobile */
  .nav-link.nav-cta {
    margin-left: 0;
    margin-top: 4px;
    justify-content: center;
    padding: 14px;
    font-size: 15px;
    border-radius: 10px;
  }

  /* Chevron rotation on open */
  .nav-dropdown.open > .dropdown-trigger .chevron-icon {
    transform: rotate(180deg);
    opacity: 1;
  }

  /* Mobile dropdown panel — accordion */
  .dropdown-menu {
    position: static;
    transform: none !important;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    box-shadow: none;
    border: none;
    border-radius: 0;
    background: transparent;
    padding: 0 0 4px 12px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 320ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
                padding 320ms ease;
  }

  .nav-dropdown.open > .dropdown-menu {
    max-height: 600px;
    padding: 4px 0 8px 12px;
  }

  /* Mobile dropdown items */
  .dropdown-link {
    font-size: 14.5px;
    padding: 10px 10px;
    border-radius: 8px;
    color: #2d3d5a;
  }

  .dropdown-link:hover {
    background: var(--nav-active-bg);
    color: var(--nav-active-color);
  }

  /* Submenu arrow rotation on open */
  .dropdown-item.has-submenu.open > .submenu-trigger .submenu-arrow {
    transform: rotate(90deg);
    opacity: 0.9;
  }

  /* Mobile submenu — nested accordion */
  .submenu {
    position: static;
    transform: none !important;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    box-shadow: none;
    border: none;
    border-left: 2px solid rgba(10, 93, 194, 0.15);
    border-radius: 0;
    background: transparent;
    padding: 0 0 0 12px;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 280ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
  }

  .dropdown-item.has-submenu.open > .submenu {
    max-height: 400px;
  }

  .submenu-link {
    padding: 8px 10px;
    font-size: 13.5px;
    border-radius: 6px;
  }

  .submenu-link:hover {
    padding-left: 14px;
  }
}

/* ============================================================
   FOCUS STYLES (ACCESSIBILITY)
   ============================================================ */
.nav-link:focus-visible,
.dropdown-link:focus-visible,
.submenu-link:focus-visible {
  outline: 2px solid var(--nav-active-color);
  outline-offset: 2px;
}

/* ============================================================
   PAGE BODY OFFSET (for fixed header)
   ============================================================ */
body {
  padding-top: var(--nav-height);
}