:root {
  --theme-color: #3f51b5;
  --accent-color: #ff4081;
  --border-color: #e0e0e0;
}

body { 
  font-family: "Rubik", sans-serif;
  font-optical-sizing: auto;
  font-weight: 400;
  font-style: normal;
  transition: background-color 0.3s ease;
}

/* Theme toggle button */
#theme-toggle {
  position: fixed;
  bottom: 100px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--theme-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

#theme-toggle:hover {
  transform: scale(1.1);
}

/* Navigation buttons */
.nav-buttons {
  margin: 3rem 0;
  padding: 1.5rem 1rem;
  display: flex;
  justify-content: space-between;
}

.nav-button {
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  background: var(--theme-color);
  color: white !important;
  text-decoration: none !important;
  transition: all 0.3s ease;
  display: inline-block;
}

.nav-button:hover {
  background: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Dark mode specific styles */
.dark {
  --border-color: #444;
}

.dark .nav-button {
  background: var(--accent-color);
}

.dark .nav-button:hover {
  background: #ff2674;
}

/* Existing sidebar styles (keep these) */
.sidebar {
  width: 280px !important;
  padding: 20px !important;
}

.sidebar-nav {
  padding: 0 !important;
}

.sidebar-nav li {
  margin: 0.5rem 0;
}

.sidebar-nav a {
  border-radius: 4px;
  padding: 6px 10px !important;
  transition: all 0.2s ease;
}

.sidebar-nav a:hover {
  background: rgba(var(--theme-color), 0.1);
}

.markdown-section {
  max-width: 900px;
  padding: 2rem 3rem;
  direction: rtl;
}

.dark .sidebar {
  background-color: #1e1e1e !important;
}

.dark .sidebar-nav a {
  color: #e0e0e0 !important;
}

code {
  direction: ltr;
}