.explain-popover {
    position: absolute;
    background: #FFFFFF;
    color: #0A0A0B;
    border-radius: var(--space-2);
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    font-weight: 600;
    transition: opacity 0.2s ease, transform 0.2s ease;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--border-subtle);
}

.explain-popover.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.explain-popover:hover {
    background: var(--bg-surface);
}

.explain-result-box {
    margin-top: var(--space-4);
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.05);
    border-left: 2px solid var(--accent-primary);
    border-radius: 0 var(--space-2) var(--space-2) 0;
    color: #E2E8F0;
    font-family: var(--font-serif);
    font-size: var(--text-base);
    line-height: 1.6;
    display: none;
}

.explain-result-box.active {
    display: block;
    animation: fadeUp 0.4s ease forwards;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}