/* ==========================================================================
   ASSICOMUNALE — Header Enterprise
   Version: 3.0.0
   Components: Top Bar + Main Header + Mega Menu + Mobile Nav + Sticky
   Zero JavaScript for animations — CSS only
   ========================================================================== */


/* ==========================================================================
   TOP BAR
   ========================================================================== */

.ac-top-bar {
  background: var(--ac-dark);
  color: rgba(255,255,255,0.7);
  font-size: var(--ac-text-xs);
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  position: relative;
  z-index: var(--ac-z-sticky);
}

.ac-top-bar__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--ac-container);
  margin: 0 auto;
  padding: 0 var(--ac-space-6);
}

.ac-top-bar__left,
.ac-top-bar__right {
  display: flex;
  align-items: center;
  gap: var(--ac-space-6);
}

.ac-top-bar__item {
  display: flex;
  align-items: center;
  gap: var(--ac-space-2);
  color: rgba(255,255,255,0.7);
  transition: color var(--ac-transition-fast);
  white-space: nowrap;
}

.ac-top-bar__item:hover {
  color: #fff;
}

.ac-top-bar__item svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  opacity: 0.7;
}

/* Social icons in top bar */
.ac-top-bar__social {
  display: flex;
  gap: var(--ac-space-3);
}

.ac-top-bar__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--ac-radius-full);
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.6);
  transition: all var(--ac-transition-fast);
}

.ac-top-bar__social a:hover {
  background: var(--ac-primary);
  color: #fff;
}

.ac-top-bar__social svg {
  width: 14px;
  height: 14px;
}

/* Divider between items */
.ac-top-bar__divider {
  width: 1px;
  height: 16px;
  background: rgba(255,255,255,0.15);
}


/* ==========================================================================
   MAIN HEADER
   ========================================================================== */

.ac-header {
  background: #fff;
  position: sticky;
  top: 0;
  z-index: var(--ac-z-sticky);
  transition:
    box-shadow var(--ac-transition),
    padding var(--ac-transition);
}

.ac-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--ac-container);
  margin: 0 auto;
  padding: 0 var(--ac-space-6);
  height: 80px;
  transition: height var(--ac-transition);
}

/* Scrolled state — added via JS */
.ac-header--scrolled {
  box-shadow: 0 1px 20px rgba(0,0,0,0.08);
}

.ac-header--scrolled .ac-header__inner {
  height: 64px;
}

.ac-header--scrolled .ac-header__logo img {
  height: 36px;
}

/* ---- Logo ---- */
.ac-header__logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.ac-header__logo img {
  height: 44px;
  width: auto;
  transition: height var(--ac-transition);
}

.ac-header__logo a {
  display: flex;
  align-items: center;
}


/* ==========================================================================
   NAVIGATION
   ========================================================================== */

.ac-nav {
  display: flex;
  align-items: center;
}

.ac-nav__list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0;
}

.ac-nav__item {
  position: relative;
}

.ac-nav__link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 1rem;
  color: var(--ac-dark);
  font-size: var(--ac-text-sm);
  font-weight: var(--ac-weight-medium);
  letter-spacing: var(--ac-tracking-normal);
  text-decoration: none;
  transition: color var(--ac-transition-fast);
  white-space: nowrap;
  position: relative;
}

/* Underline indicator on hover */
.ac-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--ac-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--ac-transition);
  border-radius: 1px;
}

.ac-nav__link:hover,
.ac-nav__link--active {
  color: var(--ac-primary);
}

.ac-nav__link:hover::after,
.ac-nav__link--active::after {
  transform: scaleX(1);
}

/* Dropdown arrow */
.ac-nav__arrow {
  width: 10px;
  height: 10px;
  flex-shrink: 0;
  transition: transform var(--ac-transition-fast);
}

.ac-nav__item:hover > .ac-nav__link .ac-nav__arrow {
  transform: rotate(180deg);
}


/* ==========================================================================
   MEGA MENU — Ultra Premium 3-Column Design
   ========================================================================== */

.ac-mega {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(12px) scale(0.98);
  transform-origin: top center;
  width: min(960px, 95vw);
  background: linear-gradient(180deg, #fff 0%, #fafbfc 100%);
  border-radius: 0 0 20px 20px;
  box-shadow:
    0 30px 80px -15px rgba(0,0,0,0.18),
    0 15px 35px -10px rgba(0,0,0,0.1),
    0 0 0 1px rgba(0,0,0,0.03),
    inset 0 1px 0 rgba(255,255,255,0.8);
  border-top: 4px solid;
  border-image: linear-gradient(90deg, var(--ac-accent) 0%, var(--ac-accent-300) 50%, var(--ac-primary) 100%) 1;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    visibility 0.3s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: var(--ac-z-dropdown);
  overflow: hidden;
}

.ac-nav__item:hover > .ac-mega {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0) scale(1);
}

.ac-mega__inner {
  display: flex;
  padding: 0;
  position: relative;
}

/* Content columns */
.ac-mega__col {
  flex: 1;
  padding: 2rem 2.25rem;
  position: relative;
}

.ac-mega__col + .ac-mega__col {
  border-left: 1px solid rgba(0,0,0,0.06);
}

/* Subtle gradient on second column */
.ac-mega__col + .ac-mega__col {
  background: linear-gradient(135deg, rgba(253,232,239,0.08) 0%, rgba(230,247,250,0.08) 100%);
}

/* Column title — premium badge style */
.ac-mega__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.65rem;
  font-weight: 800;
  color: var(--ac-accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: none;
  position: relative;
}

/* Animated gradient underline */
.ac-mega__title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--ac-accent), var(--ac-accent-300), transparent);
  border-radius: 2px;
}

.ac-mega__title a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

.ac-mega__title a:hover {
  color: var(--ac-accent-700);
  letter-spacing: 0.16em;
}

/* List of links */
.ac-mega__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* Individual link — premium card hover */
.ac-mega__link {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.625rem 0.75rem;
  margin: 0 -0.75rem;
  color: var(--ac-body);
  font-size: 0.875rem;
  font-weight: 450;
  text-decoration: none;
  border-radius: 10px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  border-left: 3px solid transparent;
}

/* Icon badge */
.ac-mega__link svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  padding: 5px;
  width: 28px;
  height: 28px;
  color: var(--ac-accent-300);
  background: var(--ac-accent-50);
  border-radius: 8px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.ac-mega__link:hover {
  background: linear-gradient(135deg, var(--ac-accent-50) 0%, rgba(253,232,239,0.4) 100%);
  color: var(--ac-accent-700);
  border-left-color: var(--ac-accent);
  padding-left: 1rem;
  box-shadow: 0 2px 8px rgba(223,22,84,0.08);
}

.ac-mega__link:hover svg {
  background: var(--ac-accent);
  color: #fff;
  transform: scale(1.05);
  box-shadow: 0 3px 10px rgba(223,22,84,0.2);
}

/* Promo column — rich gradient with glass effect */
.ac-mega__promo {
  width: 260px;
  flex-shrink: 0;
  padding: 2.5rem 2rem;
  background:
    linear-gradient(135deg, var(--ac-accent) 0%, var(--ac-accent-600) 50%, var(--ac-accent-800) 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* Decorative circles */
.ac-mega__promo::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
}

.ac-mega__promo::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: -20px;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
}

.ac-mega__promo h4 {
  font-size: 1.25rem;
  font-weight: 800;
  margin: 0 0 0.75rem;
  color: #fff;
  position: relative;
  z-index: 1;
  line-height: 1.2;
}

.ac-mega__promo p {
  font-size: 0.8125rem;
  line-height: 1.6;
  margin: 0 0 1.5rem;
  color: rgba(255,255,255,0.85);
  position: relative;
  z-index: 1;
}

.ac-mega__promo .ac-btn--white {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  background: #fff;
  color: var(--ac-accent);
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: 10px;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 1;
  box-shadow: 0 4px 15px rgba(0,0,0,0.15);
  letter-spacing: 0.02em;
}

.ac-mega__promo .ac-btn--white:hover {
  background: #fff;
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}


/* ==========================================================================
   SIMPLE DROPDOWN (Contatti → Chi Siamo)
   ========================================================================== */

.ac-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: #fff;
  border-radius: 0 0 var(--ac-radius) var(--ac-radius);
  box-shadow: var(--ac-shadow-xl);
  border: 1px solid var(--ac-border);
  border-top: 3px solid var(--ac-primary);
  padding: var(--ac-space-2) 0;
  list-style: none;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity var(--ac-transition-fast),
    visibility var(--ac-transition-fast),
    transform var(--ac-transition-fast);
  z-index: var(--ac-z-dropdown);
}

.ac-nav__item:hover > .ac-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.ac-dropdown__link {
  display: block;
  padding: 0.625rem 1.25rem;
  color: var(--ac-body);
  font-size: var(--ac-text-sm);
  font-weight: var(--ac-weight-regular);
  text-decoration: none;
  transition: all var(--ac-transition-fast);
  white-space: nowrap;
}

.ac-dropdown__link:hover {
  background: var(--ac-primary-50);
  color: var(--ac-primary);
}


/* ==========================================================================
   HEADER CTA
   ========================================================================== */

.ac-header__cta {
  flex-shrink: 0;
}

.ac-header__cta .ac-btn {
  font-size: var(--ac-text-sm);
  padding: 0.625rem 1.5rem;
}

/* Phone link next to CTA */
.ac-header__phone {
  display: flex;
  align-items: center;
  gap: var(--ac-space-2);
  color: var(--ac-primary);
  font-weight: var(--ac-weight-semibold);
  font-size: var(--ac-text-sm);
  margin-right: var(--ac-space-4);
  white-space: nowrap;
}

.ac-header__phone svg {
  width: 16px;
  height: 16px;
}

.ac-header__right {
  display: flex;
  align-items: center;
  gap: var(--ac-space-2);
}


/* ==========================================================================
   MOBILE NAVIGATION
   ========================================================================== */

/* Hamburger toggle — checkbox hack, zero JS */
.ac-menu-toggle {
  display: none;
}

.ac-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  cursor: pointer;
  position: relative;
  z-index: calc(var(--ac-z-overlay) + 1);
  background: none;
  border: none;
  padding: 0;
}

.ac-hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ac-dark);
  border-radius: 2px;
  transition:
    transform var(--ac-transition),
    opacity var(--ac-transition);
}

.ac-hamburger__line:nth-child(1) {
  transform: translateY(-7px);
}

.ac-hamburger__line:nth-child(3) {
  transform: translateY(7px);
}

/* Hamburger to X animation */
.ac-menu-toggle:checked ~ .ac-hamburger .ac-hamburger__line:nth-child(1) {
  transform: rotate(45deg);
}

.ac-menu-toggle:checked ~ .ac-hamburger .ac-hamburger__line:nth-child(2) {
  opacity: 0;
}

.ac-menu-toggle:checked ~ .ac-hamburger .ac-hamburger__line:nth-child(3) {
  transform: rotate(-45deg);
}

/* Mobile nav overlay */
.ac-mobile-overlay {
  display: none;
}

/* Mobile nav panel */
.ac-mobile-nav {
  display: none;
}

@media (max-width: 1024px) {
  /* Show hamburger */
  .ac-hamburger {
    display: flex;
  }

  /* Hide desktop nav */
  .ac-nav {
    display: none;
  }

  .ac-header__phone {
    display: none;
  }

  /* Mobile overlay */
  .ac-mobile-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: var(--ac-z-overlay);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--ac-transition),
      visibility var(--ac-transition);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
  }

  .ac-menu-toggle:checked ~ .ac-mobile-overlay {
    opacity: 1;
    visibility: visible;
  }

  /* Mobile nav panel */
  .ac-mobile-nav {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    right: 0;
    width: min(380px, 85vw);
    height: 100vh;
    height: 100dvh;
    background: #fff;
    z-index: calc(var(--ac-z-overlay) + 1);
    transform: translateX(100%);
    transition: transform var(--ac-duration-base) var(--ac-ease);
    overflow-y: auto;
    overscroll-behavior: contain;
    box-shadow: -10px 0 40px rgba(0,0,0,0.15);
  }

  .ac-menu-toggle:checked ~ .ac-mobile-nav {
    transform: translateX(0);
  }

  /* Mobile nav header */
  .ac-mobile-nav__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--ac-space-4) var(--ac-space-6);
    border-bottom: 1px solid var(--ac-border);
    min-height: 64px;
  }

  .ac-mobile-nav__header img {
    height: 32px;
    width: auto;
  }

  /* Mobile nav list */
  .ac-mobile-nav__list {
    list-style: none;
    padding: var(--ac-space-4) 0;
    margin: 0;
    flex: 1;
  }

  .ac-mobile-nav__item {
    border-bottom: 1px solid var(--ac-neutral-100);
  }

  .ac-mobile-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem var(--ac-space-6);
    color: var(--ac-dark);
    font-size: var(--ac-text-base);
    font-weight: var(--ac-weight-medium);
  }

  .ac-mobile-nav__link:hover {
    background: var(--ac-primary-50);
    color: var(--ac-primary);
  }

  /* Mobile submenu accordion */
  .ac-mobile-sub-toggle {
    display: none;
  }

  .ac-mobile-sub-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem var(--ac-space-6);
    color: var(--ac-dark);
    font-size: var(--ac-text-base);
    font-weight: var(--ac-weight-medium);
    cursor: pointer;
  }

  .ac-mobile-sub-label svg {
    width: 16px;
    height: 16px;
    transition: transform var(--ac-transition);
    color: var(--ac-muted);
  }

  .ac-mobile-sub-toggle:checked ~ .ac-mobile-sub-label svg {
    transform: rotate(180deg);
    color: var(--ac-primary);
  }

  .ac-mobile-sub-toggle:checked ~ .ac-mobile-sub-label {
    color: var(--ac-primary);
    background: var(--ac-primary-50);
  }

  .ac-mobile-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--ac-duration-slow) var(--ac-ease);
    background: var(--ac-neutral-50);
  }

  .ac-mobile-sub-toggle:checked ~ .ac-mobile-submenu {
    max-height: 800px;
  }

  .ac-mobile-submenu a {
    display: block;
    padding: 0.625rem var(--ac-space-6) 0.625rem var(--ac-space-10);
    color: var(--ac-body);
    font-size: var(--ac-text-sm);
    border-bottom: 1px solid var(--ac-neutral-100);
  }

  .ac-mobile-submenu a:hover {
    color: var(--ac-primary);
    background: var(--ac-primary-50);
  }

  /* Mobile nav CTA */
  .ac-mobile-nav__cta {
    padding: var(--ac-space-6);
    border-top: 1px solid var(--ac-border);
  }

  .ac-mobile-nav__cta .ac-btn {
    width: 100%;
    justify-content: center;
  }

  /* Mobile nav contact info */
  .ac-mobile-nav__contact {
    padding: 0 var(--ac-space-6) var(--ac-space-6);
  }

  .ac-mobile-nav__contact a {
    display: flex;
    align-items: center;
    gap: var(--ac-space-3);
    padding: var(--ac-space-3) 0;
    color: var(--ac-body);
    font-size: var(--ac-text-sm);
  }

  .ac-mobile-nav__contact a:hover {
    color: var(--ac-primary);
  }

  .ac-mobile-nav__contact svg {
    width: 16px;
    height: 16px;
    color: var(--ac-primary);
    flex-shrink: 0;
  }
}

/* Hide top bar on very small screens */
@media (max-width: 640px) {
  .ac-top-bar__left {
    display: none;
  }

  .ac-top-bar__right {
    width: 100%;
    justify-content: center;
  }

  .ac-top-bar {
    padding: 0.375rem 0;
  }
}


/* ==========================================================================
   HEADER RESPONSIVE FINE-TUNING
   ========================================================================== */

@media (max-width: 1200px) {
  .ac-nav__link {
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
  }

  .ac-mega {
    width: min(800px, 95vw);
  }

  .ac-mega__promo {
    width: 200px;
    padding: 1.5rem 1.25rem;
  }
}

@media (min-width: 1025px) {
  /* Ensure menus stay visible when hovering between trigger and menu */
  .ac-nav__item:hover > .ac-mega,
  .ac-nav__item:hover > .ac-dropdown {
    pointer-events: auto;
  }

  /* Add invisible bridge between nav item and dropdown */
  .ac-nav__item > .ac-mega::before,
  .ac-nav__item > .ac-dropdown::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 0;
    right: 0;
    height: 10px;
  }
}