.nav {
  background-color: var(--c1-l);
  border: 1px solid var(--c4-l);
  box-shadow: var(--sh-l);
  position: fixed;
  top: 0;
  bottom: 0;
  z-index: 100;
  width: 60px;
  margin: 10px;
  padding: 0;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  font-weight: bold;
  will-change: transform;
}

.dark .nav {
  background-color: var(--c1-d);
  border: 1px solid var(--c4-d);
  box-shadow: var(--sh-d);
}

.nav-item {
  position: relative;
  display: flex;
  flex-direction: column;
}

.nav-item:nth-last-child(3) {
  margin-top: auto;
}

.nav-page {
  background-color: var(--c2-l);
  border-bottom: 1px solid var(--c4-l);
  position: relative;
  height: 60px;
  padding: 0 40px 0 70px;
  display: flex;
  align-items: center;
  overflow: hidden;
  white-space: nowrap;
  text-decoration: none;
  color: var(--c1-d);
  transition: transform var(--ts1) ease;
}

.dark .nav-page {
  background-color: var(--c2-d);
  border-bottom: 1px solid var(--c4-d);
  color: var(--c1-l);
}

.nav-page:hover,
.dark .nav-page:hover {
  background-color: var(--c3-l);
}

.dark .nav-page:hover {
  background-color: var(--c3-d);
}

.nav-page::before {
  content: "";
  position: absolute;
  left: -2px;
  width: 60px;
  height: 60px;
  background: var(--icon-url, url(/assets/icons/home1.svg)) center/var(--icon-size, 55%) no-repeat;
}

.nav-item:nth-child(1) .nav-page::before {
  --icon-url: url(/assets/icons/home1.svg);
}
.nav-item:nth-child(2) .nav-page::before {
  --icon-url: url(/assets/icons/games1.svg);
}
.nav-item:nth-child(3) .nav-page::before {
  --icon-url: url(/assets/icons/book1.svg);
  --icon-size: 50%;
}
.nav-item:nth-child(4) .nav-page::before {
  --icon-url: url(/assets/icons/project1.svg);
  --icon-size: 50%;
}
.nav-item:nth-child(5) .nav-page::before {
  --icon-url: url(/assets/icons/concept1.svg);
  --icon-size: 58%;
}
.nav-item:nth-child(6) .nav-page::before {
  --icon-url: url(/assets/icons/team1.svg);
  --icon-size: 58%;
}
.nav-item:nth-child(7) .nav-page::before {
  --icon-url: url(/assets/icons/contact1.svg);
  --icon-size: 53%;
}
.nav-item:nth-child(8) .nav-page::before {
  --icon-url: url(/assets/icons/shop1.svg);
}
.nav-item:nth-last-child(3) .nav-pin-toggle-btn::before {
  background-image: url(/assets/icons/pinned1.svg);
  background-size: 60%;
  transition: transform var(--ts1) ease;
}
.nav-item:nth-last-child(2) .nav-page::before {
  --icon-url: url(/assets/icons/language1.svg);
}
.nav-item:nth-last-child(1) .nav-page::before {
  --icon-url: url(/assets/icons/theme1.svg);
}

.dark .nav-item:nth-child(1) .nav-page::before {
  --icon-url: url(/assets/icons/home2.svg);
}
.dark .nav-item:nth-child(2) .nav-page::before {
  --icon-url: url(/assets/icons/games2.svg);
}
.dark .nav-item:nth-child(3) .nav-page::before {
  --icon-url: url(/assets/icons/book2.svg);
}
.dark .nav-item:nth-child(4) .nav-page::before {
  --icon-url: url(/assets/icons/project2.svg);
}
.dark .nav-item:nth-child(5) .nav-page::before {
  --icon-url: url(/assets/icons/concept2.svg);
}
.dark .nav-item:nth-child(6) .nav-page::before {
  --icon-url: url(/assets/icons/team2.svg);
}
.dark .nav-item:nth-child(7) .nav-page::before {
  --icon-url: url(/assets/icons/contact2.svg);
}
.dark .nav-item:nth-child(8) .nav-page::before {
  --icon-url: url(/assets/icons/shop2.svg);
}
.dark .nav-item:nth-last-child(3) .nav-pin-toggle-btn::before {
  background-image: url(/assets/icons/pinned2.svg);
}
.dark .nav-item:nth-last-child(2) .nav-page::before {
  --icon-url: url(/assets/icons/language2.svg);
}
.dark .nav-item:nth-last-child(1) .nav-page::before {
  --icon-url: url(/assets/icons/theme2.svg);
}

.nav-page span {
  opacity: 0;
  transform: translateX(20px);
  transition: opacity var(--ts) ease, transform var(--ts) ease;
}

.nav-pin-toggle-btn.active::before {
  transform: rotate(45deg);
}

.nav-submenu {
  max-height: 0;
  opacity: 0;
  visibility: hidden;
  overflow: hidden;
  transform: translateY(-15px) scale(0.95);
  transition: max-height var(--ts) ease, opacity var(--ts) ease, visibility var(--ts) ease, transform var(--ts) ease;
  will-change: transform, opacity, max-height;
  backface-visibility: hidden;
}

.nav-submenu.expanded {
  max-height: 400px;
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.nav-submenu-page {
  background-color: var(--c2-l);
  border-bottom: 1px solid var(--c4-l);
  height: 40px;
  padding: 0 15px;
  display: flex;
  align-items: center;
  white-space: nowrap;
  text-decoration: none;
  color: var(--c1-d);
  transition: transform var(--ts1) ease;
  will-change: transform;
}

.dark .nav-submenu-page {
  background-color: var(--c2-d);
  border-bottom: 1px solid var(--c4-d);
  color: var(--c1-l);
}

.nav-submenu-page:hover {
  background-color: var(--c3-l);
  transform: translateX(8px);
}

.dark .nav-submenu-page:hover {
  background-color: var(--c3-d);
}

.language,
.theme {
  border-top: 1px solid var(--c4-l);
  border-bottom: 0;
}

.dark .language,
.dark .theme {
  border-top: 1px solid var(--c4-d);
  border-bottom: 0;
  color: var(--c1-l);
}

.nav-pin-toggle-btn {
  border-top: 1px solid var(--c4-l);
  border-bottom: 0;
}

.dark .nav-pin-toggle-btn {
  border-top: 1px solid var(--c4-d);
  border-bottom: 0;
}

.nav-submenu-toggle {
  position: absolute;
  right: 0;
  top: 0;
  width: 40px;
  height: 60px;
  background-color: rgba(0, 0, 0, 0.05);
  border: none;
  border-left: 1px solid var(--c4-l);
  cursor: pointer;
  z-index: 5;
}

.dark .nav-submenu-toggle {
  background-color: rgba(255, 255, 255, 0.05);
  border-left: 1px solid var(--c4-d);
}

.nav-submenu-toggle:hover {
  background-color: rgba(0, 195, 116, 0.1);
}

.nav-submenu-toggle.active {
  background-color: rgba(0, 195, 116, 0.15);
}

.nav-submenu-toggle::before {
  content: "+";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 22px;
  font-weight: bold;
  color: var(--c1-d);
  transition: transform var(--ts1) ease;
}

.dark .nav-submenu-toggle::before {
  color: var(--c1-l);
}

.nav-submenu-toggle.active::before {
  content: "−";
  transform: translate(-50%, -50%) rotate(180deg);
}

.mobile-menu-btn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--c0);
  border: none;
  box-shadow: var(--sh-l);
  z-index: 101;
  cursor: pointer;
  transition: transform var(--ts1) ease, box-shadow var(--ts1) ease;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  will-change: transform;
}

.dark .mobile-menu-btn {
  box-shadow: var(--sh-d);
}

.mobile-menu-btn:hover {
  transform: scale(1.05);
}

.mobile-menu-btn:active {
  transform: scale(0.95);
}

.mobile-menu-btn span {
  display: block;
  position: absolute;
  height: 2.5px;
  width: 24px;
  background-color: white;
  border-radius: 2px;
  left: 16px;
  transition: transform var(--ts) ease, opacity var(--ts0) ease;
  will-change: transform, opacity;
}

.mobile-menu-btn span:nth-child(1) {
  top: 19px;
}
.mobile-menu-btn span:nth-child(2) {
  top: 27px;
}
.mobile-menu-btn span:nth-child(3) {
  top: 35px;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(10px);
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

@media (min-width: 769px) {
  .nav {
    transition: width var(--ts) ease;
  }

  .nav:hover {
    width: 200px;
  }

  .nav:hover .nav-page span,
  .nav:hover .nav-pin-toggle-btn span {
    opacity: 1;
    transform: translateX(0);
  }

  .nav-item:hover .nav-submenu {
    max-height: 400px;
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }

  .nav-item-pin-toggle {
    display: flex; /* Show on desktop */
  }

  .nav.nav-pinned {
    width: 200px;
  }

  .nav.nav-pinned .nav-page span,
  .nav.nav-pinned .nav-pin-toggle-btn span {
    opacity: 1;
    transform: translateX(0);
  }

  .nav-is-pinned main {
    margin-left: 210px;
  }

  .nav-submenu-toggle {
    display: none;
  }

  /* Simple submenu indicator - border on right side */
  .nav:hover .nav-item:has(.nav-submenu-toggle) .nav-page,
  .nav.nav-pinned .nav-item:has(.nav-submenu-toggle) .nav-page {
    border-right: 3px solid #999999;
  }

  .nav:hover .nav-item:hover:has(.nav-submenu-toggle) .nav-page,
  .nav.nav-pinned .nav-item:hover:has(.nav-submenu-toggle) .nav-page {
    border-right-color: var(--c0);
  }
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  .nav {
    left: 0;
    width: 300px;
    margin: 0;
    top: 0;
    bottom: 0;
    border-radius: 0;
    border: none;
    border-right: 1px solid var(--c4-l);
    transition: transform var(--ts1) ease;
    background-color: var(--c1-l-70);
    backdrop-filter: blur(5px);
    transform: translateX(-100%);
    will-change: transform;
    backface-visibility: hidden;
  }

  .dark .nav {
    border-right: 1px solid var(--c4-d);
    background-color: var(--c1-d-70);
  }

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

  .nav-page span {
    opacity: 1;
    transform: translateX(0);
    transition: transform var(--ts1) ease;
    will-change: transform;
  }

  .nav-page {
    background-color: var(--c2-l-70);
    will-change: transform;
  }

  .dark .nav-page {
    background-color: var(--c2-d-70);
  }

  .nav-page:hover {
    background-color: var(--c3-l-70);
  }

  .dark .nav-page:hover {
    background-color: var(--c3-d-70);
  }

  .nav-page:active {
    transform: scale(0.98);
  }

  .nav-submenu-page {
    background-color: var(--c2-l-70);
  }

  .dark .nav-submenu-page {
    background-color: var(--c2-d-70);
  }

  .nav-submenu-page:hover {
    background-color: var(--c3-l-70);
  }

  .dark .nav-submenu-page:hover {
    background-color: var(--c3-d-70);
  }

  .nav-item:nth-last-child(1) .nav-submenu-toggle,
  .nav-item:nth-last-child(2) .nav-submenu-toggle {
    display: none;
  }

  .nav-item-pin-toggle {
    display: none !important;
  }

  .menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0);
    z-index: 99;
    pointer-events: none;
    transition: opacity var(--ts) ease, visibility var(--ts) ease;
    visibility: hidden;
    opacity: 0;
    will-change: opacity;
  }

  .menu-overlay.active {
    background-color: rgba(0, 0, 0, 0.5);
    pointer-events: auto;
    visibility: visible;
    opacity: 1;
  }

  .nav-submenu-toggle {
    background-color: var(--c3-l-70);
  }

  .dark .nav-submenu-toggle {
    background-color: var(--c3-d-70);
  }

  .nav-submenu-toggle.active {
    background-color: rgba(0, 195, 116, 0.2);
  }

  body.nav-is-pinned main {
    margin-left: 0 !important;
  }

  .nav-item:nth-last-child(2) {
    margin-top: auto;
  }
}

.nav-item:nth-last-child(3) .nav-pin-toggle-btn,
.nav-item:nth-last-child(2) .nav-page,
.nav-item:nth-last-child(1) .nav-page {
  cursor: pointer;
}