/* ============================================
   NAV.CSS — Навигация с выпадающим меню
   СертификатыСПб.рф
   ============================================ */

/* ----- Базовые переменные (если не подключён styles.css) ----- */
:root {
  --nav-dropdown-bg: #ffffff;
  --nav-dropdown-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  --nav-dropdown-radius: 16px;
  --nav-dropdown-border: #E5E7EB;
  --nav-item-hover-bg: #F5F3FF;
  --nav-item-hover-color: #7C3AED;
  --nav-transition: 0.2s ease;
  --nav-z: 1000;
}

/* ============================================
   NAV ITEM + DROPDOWN TRIGGER
   ============================================ */
.nav__item {
  position: relative;
}

.nav__item--dropdown {
  display: flex;
  align-items: center;
}

/* Кнопка-триггер выпадающего меню */
.nav__link--toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  color: inherit;
  cursor: pointer;
  padding: 0;
  line-height: inherit;
}

.nav__arrow {
  font-size: 11px;
  transition: transform var(--nav-transition);
  display: inline-block;
}

.nav__item--dropdown:hover .nav__arrow,
.nav__item--dropdown.is-open .nav__arrow {
  transform: rotate(180deg);
}

/* ============================================
   DROPDOWN PANEL
   ============================================ */
.nav__dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  z-index: var(--nav-z);

  background: var(--nav-dropdown-bg);
  border: 1px solid var(--nav-dropdown-border);
  border-radius: var(--nav-dropdown-radius);
  box-shadow: var(--nav-dropdown-shadow);
  padding: 12px;
  min-width: 520px;

  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--nav-transition),
    transform var(--nav-transition),
    visibility var(--nav-transition);
}

/* Показать при наведении на родителя */
.nav__item--dropdown:hover .nav__dropdown,
.nav__item--dropdown.is-open .nav__dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* Стрелочка-указатель */
.nav__dropdown::before {
  content: '';
  position: absolute;
  top: -7px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  background: var(--nav-dropdown-bg);
  border-left: 1px solid var(--nav-dropdown-border);
  border-top: 1px solid var(--nav-dropdown-border);
  transform: translateX(-50%) rotate(45deg);
}

/* ============================================
   DROPDOWN GRID
   ============================================ */
.nav__dropdown-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}

/* ============================================
   DROPDOWN ITEM
   ============================================ */
.nav__dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  text-decoration: none;
  color: #111827;
  transition:
    background var(--nav-transition),
    color var(--nav-transition),
    transform var(--nav-transition);
  cursor: pointer;
}

.nav__dropdown-item:hover {
  background: var(--nav-item-hover-bg);
  color: var(--nav-item-hover-color);
  transform: translateX(2px);
}

.nav__dropdown-emoji {
  font-size: 20px;
  flex-shrink: 0;
  line-height: 1;
}

.nav__dropdown-label {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.3;
}

/* ============================================
   БУРГЕР-КНОПКА (мобильная)
   ============================================ */
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 5px;
  background: none;
  border: none;
  cursor: pointer;
  justify-content: center;
  align-items: center;
}

.nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: #111827;
  border-radius: 2px;
  transition: all var(--nav-transition);
  transform-origin: center;
}

/* Анимация бургера в крестик */
.nav__burger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__burger.is-active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__burger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   МОБИЛЬНАЯ ВЕРСИЯ
   ============================================ */
@media (max-width: 768px) {
  .nav__burger {
    display: flex;
  }

  .nav__cta {
    display: none;
  }

  /* Скрытая мобильная навигация */
  .nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background: #ffffff;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
    z-index: calc(var(--nav-z) - 1);
    padding: 72px 20px 32px;
    overflow-y: auto;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;

    transform: translateX(100%);
    transition: transform 0.3s ease;
  }

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

  /* Оверлей */
  .nav::before {
    content: '';
    position: fixed;
    inset: 0;
    right: min(320px, 85vw);
    background: rgba(0, 0, 0, 0.4);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
  }
  .nav.is-open::before {
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    display: block;
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 500;
  }
  .nav__link:hover {
    background: var(--nav-item-hover-bg);
    color: var(--nav-item-hover-color);
  }

  /* Мобильное выпадающее (аккордеон) */
  .nav__item--dropdown {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
  }

  .nav__link--toggle {
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    justify-content: space-between;
    font-size: 16px;
    font-weight: 500;
  }
  .nav__link--toggle:hover {
    background: var(--nav-item-hover-bg);
    color: var(--nav-item-hover-color);
  }

  .nav__dropdown {
    position: static;
    transform: none;
    min-width: 0;
    width: 100%;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 4px 0 4px 12px;
    background: transparent;

    max-height: 0;
    overflow: hidden;
    opacity: 1;
    visibility: visible;
    pointer-events: none;
    transition: max-height 0.3s ease, padding 0.3s ease;
  }

  .nav__dropdown::before { display: none; }

  .nav__item--dropdown.is-open .nav__dropdown {
    max-height: 600px;
    padding: 4px 0 4px 12px;
    pointer-events: auto;
  }

  .nav__dropdown-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2px;
  }

  .nav__dropdown-item {
    padding: 8px 10px;
    border-radius: 8px;
  }

  .nav__dropdown-label {
    font-size: 13px;
  }
}

@media (max-width: 400px) {
  .nav__dropdown-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   JS-СКРИПТ для мобильного меню
   Добавьте в конец страницы перед </body>:

   const burger = document.getElementById('navBurger');
   const nav    = document.getElementById('mainNav');
   burger.addEventListener('click', () => {
     const open = nav.classList.toggle('is-open');
     burger.classList.toggle('is-active', open);
     burger.setAttribute('aria-expanded', open);
   });
   document.querySelectorAll('.nav__link--toggle').forEach(btn => {
     btn.addEventListener('click', () => {
       const item = btn.closest('.nav__item--dropdown');
       item.classList.toggle('is-open');
       btn.setAttribute('aria-expanded', item.classList.contains('is-open'));
     });
   });
   ============================================ */