/* ===== Back to top button ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-medium);
    opacity: 0;
    transform: translateY(20px);
    visibility: hidden;
    z-index: var(--z-fixed);
    border: none;
    box-shadow: var(--shadow-md);
  }
  
  .back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
  }
  
  .back-to-top:hover {
    background: var(--gradient-primary-hover);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
  }
  
  .toast-container {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  .toast {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transform: translateX(-120%);
    opacity: 0;
    transition: all var(--transition-medium);
    max-width: 350px;
  }
  
  .toast.show {
    transform: translateX(0);
    opacity: 1;
  }
  .toast-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-size: 1.2rem;
    flex-shrink: 0;
  }
  
  .toast-icon.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-tertiary);
  }
  
  .toast-icon.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
  }
  
  .toast-icon.info {
    background-color: rgba(59, 130, 246, 0.1);
    color: #3b82f6;
  }
  
  .toast-content {
    flex: 1;
  }
  
  .toast-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 2px;
  }
  
  .toast-message {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
  }
  
  .toast-close {
    background: transparent;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    font-size: 1rem;
    transition: color var(--transition-fast);
    padding: 5px;
  }
  
  .toast-close:hover {
    color: var(--color-text-primary);
  }