/* Help Icons */
.help-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.3);
    margin-left: 8px;
    cursor: help;
    font-size: 12px;
    font-weight: bold;
    color: rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
    background: transparent;
    vertical-align: middle;
}

.help-trigger:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
    color: white;
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.3);
}

/* Tooltip Popup */
.edu-popup {
    position: absolute;
    z-index: 10000;
    max-width: 300px;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.25rem;
    border-radius: 1rem;
    color: #f8fafc;
    font-size: 0.95rem;
    line-height: 1.5;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.95);
    transition:
        opacity 0.4s ease,
        transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
        visibility 0.4s;
    pointer-events: auto;
    /* Allow mouse inside the popup */
}

.edu-popup.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.edu-popup h4 {
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.edu-popup p {
    color: #94a3b8;
    margin: 0;
}

.edu-popup .formula-highlight {
    display: block;
    background: rgba(255, 255, 255, 0.05);
    padding: 8px;
    border-radius: 6px;
    margin-top: 10px;
    font-family: monospace;
    color: var(--accent-secondary);
    text-align: center;
}