/* ==========================================================================
   Publications Page Styles
   ========================================================================== */

/* Filter Buttons */
.filter-btn {
    background: var(--gradient-card);
    border: 1px solid var(--cyber-border);
    color: var(--text-muted);
    transition: all var(--transition-base);
}

.filter-btn:hover {
    border-color: var(--cyber-blue);
    color: var(--cyber-blue);
}

.filter-btn.active {
    background: var(--gradient-primary);
    border-color: var(--cyber-blue);
    color: var(--cyber-dark);
    box-shadow: 0 0 15px rgba(var(--cyber-blue-rgb), 0.3);
}

/* Abstract Toggle */
.abstract-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.abstract-content.open {
    max-height: 1000px;
}

/* Publication Card Visibility */
.publication-card {
    display: block;
}

.publication-card.hidden {
    display: none;
}

/* Year Section Marker */
.year-marker {
    position: relative;
}

.year-marker::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 4px;
    height: 100%;
    background: var(--gradient-vertical);
    transform: translateY(-50%);
    box-shadow: 0 0 10px rgba(var(--cyber-blue-rgb), 0.5);
}