#side-menu {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: var(--bg-secondary);
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 100;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

#side-menu.open {
  transform: translateX(0);
}

#menu-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

#menu-content h2 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text-primary);
}

#menu-items {
  list-style: none;
  flex: 1;
}

#menu-items li {
  margin-bottom: 8px;
}

#menu-items button {
  width: 100%;
  padding: 16px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 16px;
  text-align: left;
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

#menu-items button:hover {
  background: var(--border);
}

#menu-items button:active {
  background: var(--accent);
}

#menu-footer {
  padding-top: 16px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-secondary);
}

#menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 99;
}

#menu-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.swipe-hint {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 100px;
  background: linear-gradient(
    to right,
    transparent,
    var(--accent)
  );
  opacity: 0.5;
  border-radius: 2px;
  animation: swipe-hint-pulse 2s ease-in-out infinite;
}

@keyframes swipe-hint-pulse {
  0%, 100% { opacity: 0.3; width: 4px; }
  50% { opacity: 0.6; width: 8px; }
}

@media (max-width: 600px) {
  #side-menu {
    width: 100%;
  }
}