/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: 2px solid var(--primary-color);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--primary-color);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--text-color);
}

.btn-secondary:hover {
    background-color: var(--text-color);
    color: white;
}

.btn-text {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

/* Timeline/Experience */
.timeline {
    border-left: 2px solid var(--bg-secondary);
    padding-left: 2rem;
    margin-left: 1rem;
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.6rem;
    top: 0.5rem;
    width: 1rem;
    height: 1rem;
    background-color: var(--primary-color);
    border-radius: 50%;
    border: 3px solid #111827;
    box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.timeline-content h3 {
    margin-bottom: 0.5rem;
}

/* Publications & Projects Cards */
.pub-item,
.project-item {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    margin-bottom: 1.5rem;
    border: 1px solid #374151;
    transition: transform 0.2s, background 0.2s;
    cursor: pointer;
}

/* Slightly lighter than bg-secondary */

.pub-item:hover,
.project-item:hover {
    transform: translateY(-5px);
    background: #253346;
}

.pub-item.active,
.project-item.active {
    border-color: var(--primary-color);
}

.abstract {
    display: none;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #374151;
    font-size: 0.95rem;
    color: #d1d5db;
    line-height: 1.7;
}

.pub-item.active .abstract,
.project-item.active .abstract {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.pub-links {
    margin-top: 1rem;
    display: flex;
    gap: 1.5rem;
}