:root {
  --bg-color-light: #f5f7fa;
  --bg-color-dark: #1a202c;
  --text-color-light: #2d3748;
  --text-color-dark: #e2e8f0;
  --primary-color-light: #4a5568;
  --primary-color-dark: #81e6d9;
  --card-bg-light: #ffffff;
  --card-bg-dark: #2d3748;
  --accent-color: #3182ce;
  --link-color: #3182ce; /* Link color */
  --link-hover-color: #2c5282; /* Link hover color */
  --link-visited-color: #3182ce; /* Visited link color */
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
  background-color: var(--bg-color-light);
  color: var(--text-color-light);
  margin: 0;
  padding: 0;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease-in-out, color 0.3s ease-in-out;
}

.app-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--card-bg-light);
  color: var(--text-color-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  height: 60px;
  box-sizing: border-box;
}

.app-bar h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
}

.nav-links {
  display: flex;
  align-items: center;
}

.nav-links a {
  color: var(--link-color);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:visited {
  color: var(--link-visited-color); /* Ensure visited links have proper color */
}

.nav-links a:hover {
  color: var(--link-hover-color);
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text-color-light);
  margin: 2px 0;
}

.toggle-container {
  display: flex;
  align-items: center;
  cursor: pointer;
  margin-left: 1rem;
  margin-right: 0.5rem;
}

.theme-toggle {
  display: none;
}

.toggle-label {
  width: 48px;
  height: 24px;
  background-color: var(--primary-color-light);
  border-radius: 24px;
  position: relative;
  cursor: pointer;
}

.toggle-label::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: white;
  top: 2px;
  left: 2px;
  transition: transform 0.3s;
}

.theme-toggle:checked + .toggle-label {
  background-color: var(--primary-color-dark);
}

.theme-toggle:checked + .toggle-label::after {
  transform: translateX(24px);
}

.container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
  padding: 2rem;
  background-color: var(--card-bg-light);
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  width: calc(100% - 2rem); /* Adjusted width */
  max-width: 1200px; /* Increased max-width */
  margin: 80px auto 20px;
  text-align: left;
  box-sizing: border-box; /* Ensure padding and border are included in width */
}

.container ul {
  padding-left: 1.5rem;
  margin-left: 1.5rem;
}

h1, h2 {
  color: var(--text-color-light);
  margin-top: 0;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-top: 2rem;
}

p, ul {
  margin-bottom: 1.5rem;
}

.invite-btn {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.3s, transform 0.2s;
}

.invite-btn:hover {
  background-color: #2c5282;
  transform: translateY(-2px);
}

.dark-mode, .dark-mode body {
  background-color: var(--bg-color-dark);
  color: var(--text-color-dark);
}

.dark-mode .app-bar {
  background-color: var(--card-bg-dark);
}

.dark-mode .container {
  background-color: var(--card-bg-dark);
}

.dark-mode h1, .dark-mode h2 {
  color: var(--text-color-dark);
}

.dark-mode .nav-links a {
  color: var(--text-color-dark);
}

.dark-mode .nav-links a:visited {
  color: var(--text-color-dark); /* Ensure visited links are visible in dark mode */
}

.dark-mode .nav-links a:hover {
  color: var(--primary-color-dark);
}

.dark-mode .invite-btn {
  background-color: var(--primary-color-dark);
  color: var(--bg-color-dark);
}

.dark-mode .invite-btn:hover {
  background-color: #4fd1c5;
}

.dark-mode .hamburger span {
  background-color: var(--text-color-dark);
}

@media (max-width: 768px) {
  .app-bar {
    padding: 0.5rem;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    width: 100%;
    background-color: var(--card-bg-light);
    padding: 1rem;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    margin: 0.5rem 0;
    font-size: 1.1rem; /* Increase font size for better readability */
  }

  .hamburger {
    display: flex;
  }

  .dark-mode .nav-links {
    background-color: var(--card-bg-dark);
  }

  .container {
    margin: 70px 10px 10px;
    padding: 1.5rem;
    width: auto; /* Adjust width for small screens */
    max-width: 100%;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }
}