.timeline {
    position: relative;
    margin: 50px auto;
    padding: 40px 0;
    max-width: 1000px;
    box-sizing: border-box;
}

/* Base vertical line */
.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #e0e0e0;
    z-index: 0;
}

/* Animated progress line */
.timeline-progress {
    position: absolute;
    left: 50%;
    top: 0;
    width: 5px;
    height: 0;
    background: #1b1618;
    transition: height 0.25s ease-out;
}

/* Reset list */
.timeline ul {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: step;
}

/* Timeline item */
.timeline ul li:nth-child(odd) {
    position: relative;
    width: 50%;
    padding: 20px 104px 40px 10px;
    box-sizing: border-box;
    opacity: 0.35;
    transition: opacity 0.4s ease, transform 0.4s ease;
    margin-bottom: 100px;
}

.timeline ul li:nth-child(even) {
    position: relative;
    width: 50%;
    padding: 20px 10px 40px 100px;
    box-sizing: border-box;
    opacity: 0.35;
    transition: opacity 0.4s ease, transform 0.4s ease;
    margin-bottom: 100px;
}

.timeline ul li:last-child {
    margin-bottom: 0px;
}

/* Alternating layout */
.timeline ul li:nth-child(odd) {
    float: left;
    text-align: right;
    clear: both;
}

.timeline ul li:nth-child(even) {
    float: right;
    text-align: left;
    clear: both;
}

.timeline ul li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    top: 24px;
    width: 50px;
    height: 50px;
    background: #1b1618;
    color: #fff;
    font-size: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    box-shadow: 0 0 0 3px rgba(29, 18, 21, 0.2);
    transition: all 0.3s ease;
}

/* Circle positioning */
.timeline ul li:nth-child(odd)::before {
    right: -26px;
}

.timeline ul li:nth-child(even)::before {
    left: -23px;
}

/* Active step */
.timeline ul li.active {
    opacity: 1;
}

.timeline ul li.active::before {
    background: #000;
    transform: scale(1.15);
    box-shadow: -4px 6px 13px 5px rgba(0, 0, 0, 0.3);
}


.content {
    display: block;
}

.timeline ul li h3 {
    margin: 0;
    font-size: 22px;
    color: #000;
}

.timeline ul li p {
    margin: 10px 0 0;
    line-height: 1.6;
    color: #444;
}

.step-img {
    max-width: 350px;
}

.timeline ul li .time {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    box-shadow: 0 0 0 3px rgba(24, 20, 21, 0.25);
}

/* Image positioning */
.timeline ul li:nth-child(odd) .time {
    right: -482px;
}

.timeline ul li:nth-child(even) .time {
    left: -482px;
}

/* Clear floats */
.timeline ul li::after {
    content: '';
    display: block;
    clear: both;
}

@media (max-width: 1000px) {
    .timeline {
        max-width: 100%;
    }
}

@media (max-width: 767px) {

    .timeline::before,
    .timeline-progress {
        left: 20px;
    }

    .timeline ul li {
        width: 100%;
        padding: 20px 20px 20px 60px;
        text-align: left;
    }

    .timeline ul li::before {
        top: 20px;
        left: 16px;
        right: auto;
    }

    .timeline ul li .time {
        position: relative;
        top: auto;
        left: auto;
        right: auto;
        transform: none;
        margin-top: 15px;
        box-shadow: none;
        padding: 0;
    }

    .step-img {
        max-width: 120px;
    }
}