:root {
  --background-color: #000;
  --text-color: #fff;
  --header-bg: rgba(130, 128, 128, 0.627);
  --header-mini-bg: rgba(0, 0, 0, 0.8);
  --link-underline-color: #fff;
  --transition-duration: 0.3s;
  --font-family-sans: Arial, Verdana, sans-serif;
  --custom-font: 'Decima Nova';
}

html {
  box-sizing: border-box;
  background-color: var(--background-color);
  scroll-behavior: smooth;
}

*, *::before, *::after {
  box-sizing: inherit;
}

body {
  margin: 0;
  font-family: var(--font-family-sans);
  padding-top: 0;
  color: var(--text-color);
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 15px;
}

@font-face {
  font-family: var(--custom-font);
  src: url('../fonts/DecimaNovaPro.woff2') format('woff2');
}

/* ========== СТИЛИ ДЛЯ ШАПКИ ========== */
.header {
  position: relative;
  width: 100%;
  background-color: var(--header-bg);
  z-index: 999;
  transition:
    padding var(--transition-duration) ease,
    backdrop-filter var(--transition-duration) ease,
    box-shadow var(--transition-duration) ease,
    height var(--transition-duration) ease;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  font-family: var(--custom-font), sans-serif;
  padding: 10px 0;
}

.header.shrink {
  padding: 4px 0;
  backdrop-filter: blur(5px);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.header.shrink .header__container {
  padding: 10px 0;
}

.header.shrink .logo__img {
  height: 26px;
}

.header.shrink .logo__text {
  font-size: 1.1rem;
}

.header img {
  border-radius: 2px;
}

.header__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo {
  display: flex;
  align-items: center;
}

.logo__img {
  display: block;
  height: 32px;
  object-fit: contain;
  animation: rotateLogo 3s linear infinite;
}

@keyframes rotateLogo {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.logo__text {
  font-size: 1.25rem;
  font-weight: normal;
  color: var(--text-color);
  margin-left: 10px;
}

.menu {
  margin-left: -20px;
}

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

.menu__item:not(:last-child) {
  margin-right: 2.5rem;
}

.menu__link {
  font-size: 1rem;
  position: relative;
  display: inline-block;
  padding-bottom: 0.3125rem;
  color: var(--text-color);
}

.menu__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--link-underline-color);
  transition: width var(--transition-duration) ease;
}

.menu__link:hover::after,
.menu__link:focus::after {
  width: 100%;
}

.language-switcher {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: flex-start;
}

.language-flag {
  width: 30px;
  cursor: pointer;
  transition: transform 0.3s ease, opacity 0.3s ease;
  border-radius: 2px;
  opacity: 0.5;
}

.language-flag:hover,
.language-flag:focus {
  transform: scale(1.1);
}

.language-flag.selected {
  transform: scale(1.2);
  opacity: 1;
}

.title, .description {
  color: var(--text-color);
}

.header_mini {
  background-color: var(--header-mini-bg);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.877);
}

a:focus,
.menu__link:focus,
.language-flag:focus {
  outline: none;
}

@media (max-width: 768px) {
  .header__container {
    flex-direction: column;
    padding: 10px 0;
  }

  .menu__list {
    flex-direction: column;
  }

  .menu__item:not(:last-child) {
    margin-right: 0;
    margin-bottom: 10px;
  }
}