* {
  padding: 0;
  margin: 0;
  list-style: none;
}

.nav {
  width: 100%;
  height: 100%;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 100;
  pointer-events: none;
}

.nav > nav {
  pointer-events: auto;
}

nav label.m-menu_toggle {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

#hamburger-icon {
  position: absolute;
  top: 10px;
  left: 16px;
  z-index: 1;
  color: var(--nav-icon-color);
}

nav .m-menu {
  position: absolute;
  top: 0;
  left: 0;
  max-width: 450px;
  width: calc(100vw - 30px);
  height: 100%;
  transform: translate3d(-480px, 0, 0);
  z-index: 4;
  overflow: hidden;
  background-color: var(--menu-bg);
  color: var(--menu-text);
  transition: transform 0.3s ease;
  pointer-events: auto;
}

nav .m-menu .m-menu {
  transform: translate3d(480px, 0, 0);
}

nav .m-menu_overlay {
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  position: absolute;
  top: 0;
  width: 100%;
  bottom: 0;
  z-index: 1;
  display: none;
  pointer-events: auto;
}

nav .m-menu_header {
  padding: 0 16px;
  height: 50px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

nav .m-menu_header .m-menu_toggle {
  border: none !important;
  background: none;
  padding: 0;
  display: flex;
  flex-direction: row;
  align-items: center;
  width: 100%;
  cursor: pointer;
  outline: none;
}

nav .m-menu_header .m-menu_toggle svg {
  flex-shrink: 0;
}

nav .m-menu_header span {
  font-size: 1.2rem;
  font-weight: bold;
  text-align: center;
  flex: 1;
  min-width: 0;
  padding: 15px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

nav .m-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
  height: auto;
  max-height: calc(100% - 50px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
  z-index: 1;
}

nav .m-menu ul:not(:first-child) {
  padding-bottom: 5rem;
}

nav .m-menu ul li {
  list-style: none;
  background-color: var(--menu-bg);
}

nav .m-menu ul li:active {
  background: var(--accent-color);
}

nav .m-menu ul li label,
nav .m-menu ul li > a {
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: left;
  padding: 20px 30px;
  min-height: 54px;
  cursor: pointer;
  position: relative;
  line-height: 1.1;
  border-bottom: 1px solid var(--border-color);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

nav .m-menu ul li a {
  color: inherit;
}

nav .m-menu ul::-webkit-scrollbar {
  width: 6px;
}

nav .m-menu ul::-webkit-scrollbar-track {
  background: transparent;
}

nav .m-menu ul::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 10px;
}

@media (hover: hover) {
  nav .m-menu ul li:hover {
    background: var(--border-color);
  }
}

@media (orientation: portrait) {
  #ori-land:checked ~ #canvas .nav .m-menu {
    width: calc(100vh - 30px);
    height: 100vw;
  }
}

@media (orientation: landscape) {
  #ori-port:checked ~ #canvas .nav .m-menu {
    width: calc(100vh - 30px) !important;
    height: 100vw;
  }
}

.m-menu_description {
  display: block;
  font-size: 0.75rem;
  opacity: 0.6;
  margin-top: 2px;
  white-space: normal;
  line-height: 1.2;
}

nav .m-menu ul li label.a-label_chevron::after {
  content: "";
  position: absolute;
  display: inline-block;
  height: 8px;
  width: 8px;
  border-color: currentColor;
  border-style: solid;
  border-width: 1.5px 1.5px 0 0;
  transform: rotate(45deg);
  top: 50%;
  margin-top: -4px;
  right: 16px;
}

.spinner {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  display: none;
  pointer-events: none;
}

.spinner::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#color-list label:active .spinner,
#lang-list label:active .spinner,
#theme-list label:active .spinner,
#ori-list label:active .spinner {
  display: block;
}

#menu:checked ~ #canvas .nav .m-menu_overlay {
  display: block;
}

#menu:checked ~ #canvas .nav > nav > .m-menu {
  transform: translate3d(0, 0, 0);
}

nav .m-menu_checkbox:checked + .m-menu,
nav .m-menu_checkbox:checked ~ .m-menu {
  transform: translate3d(0, 0, 0);
}

#color-blue:checked ~ #canvas #color-list label[for="color-blue"],
#color-red:checked ~ #canvas #color-list label[for="color-red"],
#color-green:checked ~ #canvas #color-list label[for="color-green"],
#color-orange:checked ~ #canvas #color-list label[for="color-orange"],
#color-purple:checked ~ #canvas #color-list label[for="color-purple"],
#color-pink:checked ~ #canvas #color-list label[for="color-pink"],
#color-teal:checked ~ #canvas #color-list label[for="color-teal"],
#color-indigo:checked ~ #canvas #color-list label[for="color-indigo"],
#color-yellow:checked ~ #canvas #color-list label[for="color-yellow"],
#color-gray:checked ~ #canvas #color-list label[for="color-gray"],
#lang-af:checked ~ #canvas #lang-list label[for="lang-af"],
#lang-ar:checked ~ #canvas #lang-list label[for="lang-ar"],
#lang-bn:checked ~ #canvas #lang-list label[for="lang-bn"],
#lang-bg:checked ~ #canvas #lang-list label[for="lang-bg"],
#lang-ca:checked ~ #canvas #lang-list label[for="lang-ca"],
#lang-zh:checked ~ #canvas #lang-list label[for="lang-zh"],
#lang-hr:checked ~ #canvas #lang-list label[for="lang-hr"],
#lang-cs:checked ~ #canvas #lang-list label[for="lang-cs"],
#lang-da:checked ~ #canvas #lang-list label[for="lang-da"],
#lang-nl:checked ~ #canvas #lang-list label[for="lang-nl"],
#lang-en:checked ~ #canvas #lang-list label[for="lang-en"],
#lang-es:checked ~ #canvas #lang-list label[for="lang-es"],
#lang-fr:checked ~ #canvas #lang-list label[for="lang-fr"],
#lang-hi:checked ~ #canvas #lang-list label[for="lang-hi"],
#lang-pt:checked ~ #canvas #lang-list label[for="lang-pt"],
#lang-ru:checked ~ #canvas #lang-list label[for="lang-ru"],
#lang-ur:checked ~ #canvas #lang-list label[for="lang-ur"],
#theme-system:checked ~ #canvas #theme-list label[for="theme-system"],
#theme-dark:checked ~ #canvas #theme-list label[for="theme-dark"],
#theme-light:checked ~ #canvas #theme-list label[for="theme-light"],
#ori-auto:checked ~ #canvas #ori-list label[for="ori-auto"],
#ori-land:checked ~ #canvas #ori-list label[for="ori-land"],
#ori-port:checked ~ #canvas #ori-list label[for="ori-port"],
#ori-flip:checked ~ #canvas #ori-list label[for="ori-flip"],
#ori-mirr:checked ~ #canvas #ori-list label[for="ori-mirr"] {
  background-color: var(--accent-color) !important;
  color: #fff !important;
}

.m-menu::after {
  content: var(--version);
  position: absolute;
  bottom: 0;
  left: 0;
  padding: 20px 30px;
  font-size: 0.7rem;
  text-align: left;
  color: var(--border-color);
  z-index: -1;
}