@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css');
@import url('/fonts/alumni sans.css');
@import url('/fonts/oswald.css');

:root {
  --bg-color: #2d2d2d;
  --text-color: #e0e0e0;
  --accent-color: #3d5afe;
  --cont-bg: #363636;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Roboto", sans-serif;
  background-image: url("/images/background1.jpg");
  background-repeat: repeat;
  color: var(--text-color);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

/* ----------------------------------------- Шапка ----------------------------------------*/
header {
  background: var(--cont-bg);
  padding: 1rem;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo {
  height: 40px;
}

/* ----------------------------- Может удалить нафиг? -----------------------------*/
.theme-switch {
  position: relative;
  margin-left: auto;
}

.theme-switch input[type="checkbox"] {
  opacity: 0;
  position: absolute;
}

.theme-label {
  display: block;
  width: 40px;
  height: 20px;
  background: #666;
  border-radius: 10px;
  position: relative;
  cursor: pointer;
}

.theme-label::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: 0.3s;
}

.theme-switch input:checked + .theme-label::after {
  transform: translateX(20px);
}
/* --------------------------------------------------------------------------------*/
/* ----------------------------------------------------------------------------------------*/

/* ---------------------------------------- Основа ----------------------------------------*/
.container {
  display: grid;
  margin: 10px;
  grid-template-columns: 250px 1fr;
  gap: 10px;
}

/* ------------------------------------- Меню -------------------------------------*/
nav {
  background: var(--cont-bg);
  box-shadow: var(--shadow);
  border-radius: 8px;
  padding: 1.5rem;
  min-height: min-content;
  height: fit-content;
  line-height: 1;
}

nav a {
  text-decoration: none;
}
nav a:hover {
  text-decoration: none;
}

.nav-list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: "Alumni Sans", sans-serif;
  font-size: 2rem;
}

.nav-item + .nav-item {
  margin-top: 0.8rem;
  position: relative;
}

.nav-item.has-submenu > .nav-link::after {
  content: "▾";
}

.sub-menu {
  display: none;
  position: absolute;
  left: 100%;
  top: 0;
  background: var(--cont-bg);
  min-width: 200px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 0.5rem;
  list-style: none;
  z-index: 99;
}

.nav-item:hover > .sub-menu {
  display: block;
}

.nav-link {
  color: var(--text-color);
  text-decoration: none;
  padding: 0.5rem;
  display: block;
  transition: 0.3s;
  border-bottom: 1px solid transparent;
}

.nav-link:hover {
  font-weight: 500;
  border-bottom: 1px solid var(--accent-color);
}
/* --------------------------------------------------------------------------------*/

/* --------------------------------- Главное окно ---------------------------------*/
main {
  background: var(--cont-bg);
  box-shadow: var(--shadow);
  border-radius: 8px;
  padding: 2rem;
  min-height: min-content;
  line-height: 1.5;
}
main ul {
  padding-inline-start: 1rem;
}
main p {
  margin-bottom: 1em;
}
main h1 {
  margin-bottom: 1em;
}
main a {
  text-decoration: underline;
  font-weight: 500;
  color: inherit;
}
main a:hover {
  text-decoration: underline;
  font-weight: 700;
  color: inherit;
  background-color: transparent;
}
main img {
  max-width: 1000px;
  border-radius: 8px;
}
/* --------------------------------------------------------------------------------*/
/* ----------------------------------------------------------------------------------------*/

/* -------------------------------------- Подбородок --------------------------------------*/
footer {
  background: var(--cont-bg);
  padding: 1rem;
  text-align: center;
  box-shadow: var(--shadow);
  font-family: "Oswald", sans-serif;
}

footer p:first-child:before {
  font-family: "Font Awesome 6 Free";
  content: "\f1f9  ";
}
/* ----------------------------------------------------------------------------------------*/

@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
    margin: 0;
  }

  nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    
    backdrop-filter: blur(2px);
    overflow: hidden;
    z-index: -1;
  }
  nav {
    position: fixed;
    top: 0;
    left: -250px;
    height: 100vh;
    z-index: 99;
    transition: 0.3s;
    background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), rgba(50, 50, 50, 0.5)),
      url('/images/grad_back.jpg');
    background-size: cover;
    border-radius: 0;
    background-position: center;
    background-repeat: no-repeat;
  }
  .nav-list {
    margin-top: 4rem;
  }

  main {
    border-radius: 0;
    padding: 1rem;
  }
  main::after {
    display: none;
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    transition: 0.3s;
    z-index: 98;
  }

  .burger {
    border-radius: 2px;
    width: 30px;
    height: 30px;
  }

  .burger-btn {
    position: fixed;
    transform: translate(-50%, -50%);
    top: 36px;
    left: 31px;
    width: 30px;
    cursor: pointer;
  }
  .burger-btn span {
    display: block;
    width: 100%;
    box-shadow: 0 2px 10px 0 rgba(0, 0, 0, 0.3);
    border-radius: 3px;
    height: 4px;
    background: #fff;
    transition: all 0.3s;
    position: relative;
  }
  .burger-btn span + span {
    margin-top: 8px;
  }

  /* Анимации при открытии (чекбокс :checked) */
  #nav-toggle[type="checkbox"]:checked + header .burger .burger-btn span:nth-child(1) {
    animation: ease 0.5s top forwards;
  }

  #nav-toggle[type="checkbox"]:checked + header .burger .burger-btn span:nth-child(2) {
    animation: ease 0.5s scaled forwards;
  }

  #nav-toggle[type="checkbox"]:checked + header .burger .burger-btn span:nth-child(3) {
    animation: ease 0.5s bottom forwards;
  }
  /* Анимации при закрытии (чекбокс не :checked) */
  #nav-toggle[type="checkbox"]:not(:checked) + header .burger .burger-btn span:nth-child(1) {
    animation: ease 0.5s top-2 forwards;
  }

  #nav-toggle[type="checkbox"]:not(:checked) + header .burger .burger-btn span:nth-child(2) {
    animation: ease 0.5s scaled-2 forwards;
  }

  #nav-toggle[type="checkbox"]:not(:checked) + header .burger .burger-btn span:nth-child(3) {
    animation: ease 0.5s bottom-2 forwards;
  }

  @keyframes top {
    0% {
      top: 0;
      transform: rotate(0);
    }

    50% {
      top: 12px;
      transform: rotate(0);
    }

    100% {
      top: 12px;
      transform: rotate(45deg);
    }
  }
  @keyframes top-2 {
    0% {
      top: 12px;
      transform: rotate(45deg);
    }

    50% {
      top: 12px;
      transform: rotate(0);
    }

    100% {
      top: 0;
      transform: rotate(0);
    }
  }
  @keyframes bottom {
    0% {
      bottom: 0;
      transform: rotate(0);
    }

    50% {
      bottom: 12px;
      transform: rotate(0);
    }

    100% {
      bottom: 12px;
      transform: rotate(135deg);
    }
  }

  @keyframes bottom-2 {
    0% {
      bottom: 12px;
      transform: rotate(135deg);
    }

    50% {
      bottom: 12px;
      transform: rotate(0);
    }

    100% {
      bottom: 0;
      transform: rotate(0);
    }
  }
  @keyframes scaled {
    50%,
    100% {
      transform: scale(0);
    }
  }
  @keyframes scaled-2 {
    0%,
    50% {
      transform: scale(0);
    }

    100% {
      transform: scale(1);
    }
  }

  #nav-toggle[type="checkbox"]:checked ~ .container nav {
    left: 0;
  }
  #nav-toggle[type="checkbox"]:checked ~ .container main::after {
    display: block;
  }
}