:root {
  --background: #ffffff;
  --text: #333333;
  --nav-bg: #333333;
  --nav-text: #ffffff;
  --active: #4caf50;
  --border: lightgray;
  --hamburger: #4caf50;
}

[data-theme="dark"] {
  --background: #121212;
  --text: #e0e0e0;
  --nav-bg: #1f1f1f;
  --nav-text: #ffffff;
  --active: #4caf50;
  --border: #444444;
  --hamburger: #4caf50;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom-left-radius: 1em;
  border-bottom-right-radius: 1em;
  min-height: 100vh;
}

div.pad {
  padding: 20px;
}

ul.nav {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: var(--nav-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
}

li.nav {
  display: inline-block;
  border-right: 1px solid var(--border);
}

li.nav:last-child {
  border-right: none;
}

li.nav a {
  display: block;
  color: var(--nav-text);
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li.nav a:hover:not(.active) {
  background-color: rgba(255, 255, 255, 0.2);
}

.active {
  background-color: var(--active);
  font-weight: bold;
}

h1 {
  color: var(--text);
  margin-top: 1.5rem;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
}

.theme-switch-wrapper {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.theme-switch {
  display: inline-block;
  height: 34px;
  position: relative;
  width: 60px;
}

.theme-switch input {
  display: none;
}

.slider {
  background-color: #ccc;
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  border-radius: 34px;
}

.slider:before {
  background-color: white;
  bottom: 4px;
  content: "";
  height: 26px;
  left: 4px;
  position: absolute;
  width: 26px;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--active);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.slider-icon {
  color: var(--nav-text);
  margin: 0 10px;
  font-size: 1.2rem;
}

/* Hamburger menu button - hidden by default on desktop */
.navbar-toggle {
  display: none;
  background-color: transparent;
  border: none;
  color: var(--nav-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 10px;
  position: absolute;
  right: 15px;
  top: 10px;
  z-index: 1000;
}

.hamburger {
  width: 30px;
  height: 20px;
  position: relative;
  margin: 0 auto;
}

.hamburger span {
  display: block;
  position: absolute;
  height: 3px;
  width: 100%;
  background: var(--hamburger);
  border-radius: 3px;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: 0.25s ease-in-out;
}

.hamburger span:nth-child(1) {
  top: 0px;
}

.hamburger span:nth-child(2),
.hamburger span:nth-child(3) {
  top: 9px;
}

.hamburger span:nth-child(4) {
  top: 18px;
}

/* Hamburger animation when active */
.navbar-toggle.active .hamburger span:nth-child(1) {
  top: 9px;
  width: 0%;
  left: 50%;
}

.navbar-toggle.active .hamburger span:nth-child(2) {
  transform: rotate(45deg);
}

.navbar-toggle.active .hamburger span:nth-child(3) {
  transform: rotate(-45deg);
}

.navbar-toggle.active .hamburger span:nth-child(4) {
  top: 9px;
  width: 0%;
  left: 50%;
}

@media screen and (max-width: 768px) {
  .navbar-toggle {
    display: block;
    position: fixed; /* Change to fixed position */
    top: 15px; /* Adjust top position */
    right: 15px; /* Adjust right position */
  }

  ul.nav {
    flex-direction: column;
    height: 0;
    overflow: hidden;
    transition: height 0.5s ease; /* Slightly longer animation */
    position: relative;
    padding-top: 0; /* Remove top padding */
  }

  ul.nav.show {
    height: auto;
    padding-top: 60px; /* Increase padding to ensure content doesn't hide under the hamburger */
  }

  li.nav {
    border-right: none;
    border-bottom: 1px solid var(--border);
    width: 100%;
    display: block;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    visibility: hidden; /* Hide by default */
  }

  ul.nav.show li.nav {
    opacity: 1;
    transform: translateY(0);
    visibility: visible; /* Show when nav is expanded */
  }

  .theme-switch-wrapper {
    width: 100%;
    justify-content: center;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
  }

  ul.nav.show .theme-switch-wrapper {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease;
  }
}