.nexus-citation-container {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    margin: 0 4px;
}

.nexus-citation-trigger {
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #06b6d4; /* Glowing Cyan */
    width: 20px;
    height: 20px;
    position: relative;
    outline: none;
    transition: all 0.3s ease;
}

.nexus-citation-trigger:hover {
    color: #00ff99; /* Neon Green on hover */
    transform: scale(1.2);
}

.neon-radar-svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 4px currentColor);
    animation: radar-spin 8s linear infinite;
}

.pulse-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 1px solid currentColor;
    border-radius: 50%;
    animation: radar-ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
    opacity: 0;
    pointer-events: none;
}

.nexus-citation-popup {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(5px);
    width: 320px;
    padding: 1rem;
    border-radius: 12px;
    background: rgba(10, 16, 26, 0.9); /* Premium dark background */
    border: 1px solid rgba(6, 182, 212, 0.25); /* Cyan border */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5), 0 0 12px rgba(6, 182, 212, 0.15);
    z-index: 1000;
    pointer-events: none;
    opacity: 0;
    animation: popup-fade-in 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    transform-origin: bottom center;
}

.popup-header {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    color: #00ff99; /* Emerald/Neon Green micro-header */
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 0.35rem;
}

.separator {
    color: rgba(255, 255, 255, 0.3);
}

.book-title {
    display: flex;
    align-items: center;
    gap: 4px;
}

.book-author, .page-number {
    color: rgba(255, 255, 255, 0.6);
}

.popup-body {
    margin-bottom: 0.5rem;
}

.citation-quote {
    font-size: 0.85rem;
    line-height: 1.4;
    color: rgba(255, 255, 255, 0.95);
    font-style: italic;
    margin: 0;
}

.popup-footer {
    display: flex;
    justify-content: flex-end;
}

.id-badge {
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.3);
    font-family: monospace;
}

/* Animations */
@keyframes radar-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes radar-ping {
    0% {
        transform: scale(1);
        opacity: 0.8;
    }
    100% {
        transform: scale(2.2);
        opacity: 0;
    }
}

@keyframes popup-fade-in {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(8px) scale(0.95);
    }
    100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}