/* Section transitions */
.section-visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.section-hidden {
    display: none;
    opacity: 0;
    transform: translateY(24px);
}

.section-entering {
    display: block;
    opacity: 0;
    transform: translateY(24px);
}

/* Shared form elements */
.select-field {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.75rem;
    font-size: 0.875rem;
    color: #374151;
    background: white;
    appearance: auto;
    transition: border-color 0.2s;
}
.select-field:focus {
    outline: none;
    border-color: #4F46E5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.select-field-sm {
    padding: 0.375rem 0.625rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    color: #374151;
    background: white;
    appearance: auto;
}
.select-field-sm:focus {
    outline: none;
    border-color: #4F46E5;
}

.btn-secondary {
    padding: 0.375rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: #374151;
    background: white;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}
.btn-secondary:hover {
    background: #f9fafb;
    border-color: #9ca3af;
}

/* Spinner */
.spinner {
    width: 28px;
    height: 28px;
    border: 3px solid #e5e7eb;
    border-top-color: #4F46E5;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
.spinner-sm {
    width: 18px;
    height: 18px;
    border: 2px solid #e5e7eb;
    border-top-color: #4F46E5;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Drop zone active state */
#drop-zone.drag-over {
    border-color: #4F46E5;
    background: rgba(79, 70, 229, 0.05);
}

/* Data preview table */
#data-preview th {
    padding: 0.5rem 0.75rem;
    text-align: left;
    font-weight: 600;
    color: #374151;
    font-size: 0.8125rem;
}
#data-preview td {
    padding: 0.5rem 0.75rem;
    color: #6b7280;
    font-size: 0.8125rem;
}