.auth-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(5px);
  z-index: 10000;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.auth-modal-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.auth-modal-content {
  background-color: var(--surface-bg, #1e1e2e);
  border-radius: 12px;
  width: 90%;
  max-width: 400px;
  padding: 2rem;
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  transform: translateY(0);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 1px solid var(--border-color, #3a3b4a);
}

.auth-modal-overlay.hidden .auth-modal-content {
  transform: translateY(20px);
}

.auth-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  color: var(--text-color, #cdd6f4);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s;
}

.auth-modal-close:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--accent-color, #89b4fa);
}

.auth-modal-tabs {
  display: flex;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color, #3a3b4a);
  padding-bottom: 0;
}

.auth-tab {
  flex: 1;
  background: transparent;
  border: none;
  padding: 0.75rem 0;
  color: var(--text-muted, #a6adc8);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: color 0.2s;
}

.auth-tab:hover {
  color: var(--text-color, #cdd6f4);
}

.auth-tab.active {
  color: var(--accent-color, #89b4fa);
}

.auth-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-color, #89b4fa);
}

.auth-tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.auth-tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.auth-modal-content h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
  color: var(--text-color, #cdd6f4);
}

.auth-modal-subtitle {
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: var(--text-muted, #a6adc8);
  font-size: 0.9rem;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.password-hint {
  font-size: 0.75rem;
  color: var(--text-muted, #a6adc8);
  margin-top: 0.25rem;
  display: block;
}

.auth-submit-btn {
  width: 100%;
  margin-top: 0.5rem;
  justify-content: center;
  padding: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.auth-error {
  color: var(--error-color, #f38ba8);
  font-size: 0.85rem;
  min-height: 1.2rem;
  margin-top: -0.5rem;
  display: block;
}

/* User Profile Dropdown Button (Injected via JS) */
.nav-auth-container {
  display: flex;
  align-items: center;
  margin-right: 0;
  position: relative;
}

.nav-auth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-user-profile {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  background-color: rgba(137, 180, 250, 0.1);
  border: 1px solid transparent;
  color: var(--text-color, #cdd6f4);
  transition: all 0.2s ease;
}

.nav-user-profile:hover {
  border-color: rgba(137, 180, 250, 0.3);
  background-color: rgba(137, 180, 250, 0.15);
}

.nav-user-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--accent-color, #89b4fa);
  color: var(--bg-color, #11111b);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
}

.nav-user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background-color: var(--surface-bg, #1e1e2e);
  border: 1px solid var(--border-color, #3a3b4a);
  border-radius: 8px;
  min-width: 150px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease;
  z-index: 100;
}

.nav-user-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.5rem 1rem;
  background: transparent;
  border: none;
  color: var(--text-color, #cdd6f4);
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color 0.2s;
}

.nav-dropdown-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--accent-color, #89b4fa);
}