.timeline {
    max-width: 900px;
    margin: 3rem auto;
    padding: 2rem;
    position: relative;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 5rem;
}

.timeline-item::before {
    content: "";
    position: absolute;
    left: 31px;
    top: 0.3rem;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: rgb(0, 170, 255);
    box-shadow: 0 0 5px rgb(0, 170, 255);
    z-index: 2;
}

.timeline-item::after {
    content: "";
    position: absolute;
    left: 39px;
    top: 1.6rem;
    width: 3px;
    height: calc(100% + 1.5rem);
    background-color: rgb(0, 170, 255);
    opacity: 0.7;
}

.timeline-date {
    color: #00aaff;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.timeline-content {
    background-color: #1f1f1f;
    border: 1px solid #444;
    border-radius: 1rem;
    padding: 1.2rem;
    transition: 0.2s ease;
}

.timeline-content:hover {
    border-color: #00aaff;
    transform: translateY(-3px);
}

.timeline-content h2 {
    margin-top: 0;
}

.timeline-content p {
    line-height: 1.5;
}

@media (max-width: 600px) {
    .timeline {
        padding: 1rem;
    }

    .timeline-item {
        padding-left: 3rem;
    }
}