:root {
  --ls-app-entry-bgcolor: rgba(255, 255, 255, 0);
  --ls-app-entry-bgcolor-hover: #00000020;
  --ls-nav-link-bgcolor-hover: #00000020;
  --ls-nav-bgcolor: rgba(255, 255, 255, 0.3);
  --ls-text-color: black;
  --ls-nav-bottom-line-color: lightgrey;
}

@media (prefers-reduced-motion: no-preference) {
  :root {
    transition: background-color 500ms, color 220ms;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ls-app-entry-bgcolor: rgba(0, 0, 0, 0);
    --ls-app-entry-bgcolor-hover: rgba(255, 255, 255, 0.2);
    --ls-text-color: white;
    --ls-nav-bgcolor: rgba(0, 0, 0, 0.5);
    --ls-nav-bottom-line-color: black;
    --ls-nav-link-bgcolor-hover: rgba(255, 255, 255, 0.2);
  }

  :root {
    background-color: #424242;
  }
}

h1,
h2,
h3,
h4,
h5,
h6,
p,
span {
  color: var(--ls-text-color);
}

a {
  color: var(--ls-text-color);
}

body {
  font-family: "Roboto", "思源黑体", "微软雅黑", "黑体", sans-serif;
  margin: 0;
}

/* Navigation */

nav {
  display: flex;
  align-items: center;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  position: sticky;
  top: 0;
  background-color: var(--ls-nav-bgcolor);
  height: 40px;
  padding-inline-start: 8px;
  padding-inline-end: 8px;
  z-index: 9999;
  border-bottom: 1px solid var(--ls-nav-bottom-line-color);
}

nav *:first-child {
  flex-grow: 1;
}

nav *:last-child {
  flex-shrink: 1;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  justify-content: flex-end;
}

nav a {
  background-color: transparent;
  transition: background-color 220ms;
  padding: 8px;
  border-radius: 2px;
  text-decoration: none;
}

nav a:hover,a:active {
  background-color: var(--ls-nav-link-bgcolor-hover);
}

@media (width >= 600px) {
  nav {
    padding: 0 2rem 0 2rem;
  }
}

/* Utils */
.centered-x {
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  width: fit-content;
}