/* Шапка и меню «Продукция» — общие для страниц lab/ и статей. Переменные (--ink, --rule, --nav-h…) задаёт стиль страницы. */

/* nav */
.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 10;
  height: var(--nav-h);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--white);
  transition: color .4s var(--ease), background-color .4s var(--ease), backdrop-filter .4s var(--ease);
}
.nav--scrolled { background: rgba(14, 15, 16, .55); -webkit-backdrop-filter: saturate(1.4) blur(14px); backdrop-filter: saturate(1.4) blur(14px); }
.nav--dark { color: var(--ink); }
.nav--dark.nav--scrolled { background: rgba(244, 244, 242, .78); }
.nav__logo { position: relative; display: block; }
.nav__logo img { height: 16px; width: auto; transition: opacity .4s var(--ease); }
.nav__logo .logo-dark { position: absolute; inset: 0; opacity: 0; }
.nav--dark .logo-light { opacity: 0; }
.nav--dark .logo-dark { opacity: 1; }
.nav__right { display: flex; align-items: center; gap: 22px; }
.nav__phone { font-size: 14px; font-weight: 500; }
.nav__cta { font-size: 14px; font-weight: 500; padding: 10px 18px; border: 1px solid currentColor; border-radius: 999px; }


/* main menu */
/* the three menu items sit in the exact centre of the bar, independent of logo and right-side widths */
.nav__menu { position: absolute; left: 50%; translate: -50% 0; display: flex; gap: clamp(24px, 2.4vw, 36px); }
@media (max-width: 1099px) { .nav__phone { display: none; } }
.nav__link { appearance: none; display: inline-flex; align-items: center; gap: 6px; padding: 8px 0; border: 0; background: none; color: inherit; font: 500 14px/1 "Manrope", sans-serif; cursor: pointer; }
.nav__link svg { width: 12px; height: 12px; fill: none; stroke: currentColor; stroke-width: 1.5; transition: rotate .3s var(--ease); }
.nav__link[aria-expanded="true"] svg { rotate: 180deg; }
.nav__burger { display: none; }
.nav--open { color: var(--ink); background: var(--white) !important; }
.nav--open .logo-light { opacity: 0; }
.nav--open .logo-dark { opacity: 1; }

.mega { position: absolute; top: 100%; left: 0; right: 0; max-height: calc(100svh - var(--nav-h)); overflow: auto; overscroll-behavior: contain; background: var(--white); color: var(--ink); border-top: 1px solid var(--rule); box-shadow: 0 30px 60px -20px rgba(0, 0, 0, .18); opacity: 0; visibility: hidden; translate: 0 -8px; transition: opacity .3s var(--ease), translate .45s var(--ease), visibility 0s .3s; }
.nav--open .mega { opacity: 1; visibility: visible; translate: 0 0; transition: opacity .3s var(--ease), translate .45s var(--ease), visibility 0s; }
.mega__inner { max-width: 1320px; margin: 0 auto; padding: 32px var(--gutter) 28px; }
.mega__grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 28px; }
.mega__head { display: block; margin-bottom: 12px; padding-bottom: 12px; border-bottom: 1px solid var(--rule); font-size: 17px; font-weight: 500; letter-spacing: -.01em; }
.mega__head span { margin-left: 6px; font-size: 12px; font-weight: 400; color: var(--ink-3); }
a.mega__head:hover { color: var(--red); }
.mega__head em { margin-left: 8px; padding: 2px 6px; border: 1px solid var(--rule); border-radius: 999px; font-size: 10px; font-weight: 400; font-style: normal; letter-spacing: .08em; text-transform: uppercase; white-space: nowrap; vertical-align: 2px; color: var(--ink-3); }
.mega__col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.mega__group { margin-top: 8px; font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); }
.mega__group:first-child { margin-top: 0; }
.mega__item { font-size: 14px; line-height: 1.35; }
a.mega__item:hover { color: var(--red); }
a.mega__item[aria-current] { font-weight: 600; }
span.mega__item { color: var(--ink-3); }
.mega__item em { margin-left: 8px; padding: 2px 6px; border: 1px solid var(--rule); border-radius: 999px; font-size: 10px; font-style: normal; letter-spacing: .08em; text-transform: uppercase; white-space: nowrap; }
.mega__foot { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--rule); }
.mega__foot p { margin: 0; font-size: 14px; color: var(--ink-2); }
.mega__mobile { display: none; }

/* звёздочка у флагмана; кнопка аккордеона нужна только в мобильном меню */
.mega__star { position: relative; top: -.5em; width: 9px; height: 9px; margin-left: 4px; fill: var(--red); }
.mega__acc { display: none; }

@media (max-width: 899px) {
  .nav__phone { display: none; }
  .nav__menu { display: none; }
  .nav__right { gap: 10px; }
  .nav__burger { display: inline-grid; place-content: center; gap: 6px; width: 40px; height: 40px; padding: 0; border: 0; background: none; color: inherit; cursor: pointer; }
  .nav__burger span { display: block; width: 20px; height: 1.5px; background: currentColor; transition: transform .3s var(--ease); }
  .nav__burger[aria-expanded="true"] span:first-child { transform: translateY(3.75px) rotate(45deg); }
  .nav__burger[aria-expanded="true"] span:last-child { transform: translateY(-3.75px) rotate(-45deg); }
  .mega { height: calc(100svh - var(--nav-h)); max-height: none; box-shadow: none; }
  .mega__inner { padding: 16px var(--gutter) 40px; }
  .mega__mobile { display: flex; flex-wrap: wrap; gap: 12px 20px; margin-bottom: 8px; padding-bottom: 16px; border-bottom: 1px solid var(--rule); font-size: 16px; font-weight: 500; }
  .mega__mobile a { white-space: nowrap; }
  .mega__mobile a[href^="tel:"] { flex-basis: 100%; }
  .mega__grid { grid-template-columns: 1fr; gap: 0; }
  .mega__foot { flex-direction: column; align-items: flex-start; margin-top: 0; border-top: 0; }
  .nav__cta { padding: 8px 14px; font-size: 13px; }

  /* направления складываются гармошкой, косметология и медицина — сверху */
  .mega__col--main, .mega__col--med { order: -1; }
  .mega__top { position: relative; }
  .mega__head { margin: 0; padding: 16px 0; }
  .mega__acc { position: absolute; inset: 0; display: flex; align-items: center; justify-content: flex-end; width: 100%; padding: 0; border: 0; background: none; color: var(--ink-3); cursor: pointer; -webkit-tap-highlight-color: transparent; }
  .mega__acc svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.5; transition: rotate .3s var(--ease); }
  .mega__acc[aria-expanded="true"] svg { rotate: 180deg; }
  .mega__body { display: grid; grid-template-rows: 0fr; visibility: hidden; transition: grid-template-rows .4s var(--ease), visibility 0s .4s; }
  .mega__col.is-open .mega__body { grid-template-rows: 1fr; visibility: visible; transition: grid-template-rows .4s var(--ease), visibility 0s; }
  .mega__body > ul { min-height: 0; overflow: hidden; }
  .mega__body li:first-child { margin-top: 14px; }
  .mega__body li:last-child { margin-bottom: 22px; }
}

/* .com: одно направление. Заголовок и четыре колонки под ним; на телефоне гармошка открыта, ниже строки разделов */
.mega__grid--one { grid-template-columns: minmax(0, 1fr); }
.mega__blocks { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px; }
.mega__blocks ul { align-content: start; }
.mega__item--main { font-weight: 500; }
.nav__langs { display: flex; gap: 12px; margin: 0; padding: 0; list-style: none; font-size: 13px; }
.nav__langs a[aria-current] { font-weight: 600; }
@media (max-width: 899px) {
  .mega__inner { display: flex; flex-direction: column; }
  .mega__blocks { grid-template-columns: minmax(0, 1fr); gap: 18px; padding: 12px 0 16px; }
  .mega__blocks .mega__block--support { display: none; }
  .mega__body li:first-child { margin-top: 0; }
  .mega__body li:last-child { margin-bottom: 0; }
  .mega__col ul { gap: 11px; }
  .mega__item { font-size: 16px; }
  .mega__mobile { order: 2; display: grid; gap: 0; margin: 8px 0 0; padding: 0; border-bottom: 0; }
  .mega__mobile a { padding: 16px 0; border-top: 1px solid var(--rule); font-size: 17px; font-weight: 500; }
}

/* Переключатель языков: выпадающий список, пять названий в шапку не помещаются */
.nav__lang { position: relative; font-size: 13px; }
.nav__lang summary { display: flex; align-items: center; gap: 5px; padding: 8px 2px; list-style: none; cursor: pointer; white-space: nowrap; }
.nav__lang summary::-webkit-details-marker { display: none; }
.nav__lang summary svg { width: 10px; height: 10px; fill: none; stroke: currentColor; stroke-width: 1.5; transition: transform .25s; }
.nav__lang[open] summary svg { transform: rotate(180deg); }
.nav__lang .nav__langs { position: absolute; top: 100%; right: 0; z-index: 5; display: grid; gap: 2px; min-width: 128px; padding: 8px; border-radius: 12px; background: #fff; color: #111; box-shadow: 0 12px 32px rgba(0, 0, 0, .14); }
.nav__lang .nav__langs a { display: block; padding: 8px 10px; border-radius: 8px; color: inherit; text-decoration: none; }
.nav__lang .nav__langs a:hover { background: rgba(0, 0, 0, .05); }