:root {
  --color-red: 0;
  --color-green: 0;
  --color-blue: 0;
}

body {
  background-image: url("../images/light.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: rgb(var(--color-red), var(--color-green), var(--color-blue));
  font-family: system-ui;
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
  gap: 20px;
  overflow: hidden;
}

a {
  color: brown;
}

body.dark {
  background-image: url("../images/dark.jpg");
  --color-red: 255;
  --color-green: 255;
  --color-blue: 255;
}

.sidebar {
  position: relative;     
  height: 90vh;
  width: 250px;
  background-color: rgba(var(--color-red), var(--color-green), var(--color-blue), 0.5);
  color: rgb(calc(255 - var(--color-red)), calc(255 - var(--color-green)), calc(255 - var(--color-blue)));
  padding: 25px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  border-radius: 10px;
  gap: 10px;
}

.sidebar hr {
  border: none;
  border-top: 1px solid rgba(calc(255 - var(--color-red)), calc(255 - var(--color-green)), calc(255 - var(--color-blue)), 0.25);
  width: 100%;
}

#theme-button {
  width: 50px;
  height: 50px;
  background-color: rgba(var(--color-red), var(--color-green), var(--color-blue), 0.5);
  color: rgb(calc(255 - var(--color-red)), calc(255 - var(--color-green)), calc(255 - var(--color-blue)));
  font-family: system-ui;
  font-size: xx-large;
  text-align: center;
  border: none;
  border-radius: 15%;
}

.menu-btn {
  display: flex;
  align-items: center;
  padding: 15px;
  background-color: rgba(255,255,255,0.1);
  border-radius: 8px;
  text-decoration: none;
  color: inherit;
  transition: background-color 0.3s, transform 0.2s;
}

.menu-btn:hover {
  background-color: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}

.menu-btn .icon {
  font-size: 2em;
  margin-right: 10px;
}

.menu-btn .text .title {
  font-weight: bold;
}

.menu-btn .text .subtitle {
  font-size: 0.85em;
  opacity: 0.7;
}

.content {
  flex: 1;         
  max-height: 80vh;
  overflow-y: auto;
  padding: 0 20px;
}