:root {
    --theme-primary: #007bff;
    --theme-accent: #f96d00;
    --theme-text: #6c757d;
    --theme-heading: #343a40;
    --theme-bg-light: #f8f9fa;
    --theme-border: #e9ecef;
    --theme-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);

    --theme-bg-canvas: #f7f8fa;
}

.site-section-light-bg {
    background-color: var(--theme-bg-canvas);
}

.timeline-nav-sidebar {
    position: -webkit-sticky;
    position: sticky;
    top: 100px;
    padding: 20px;
    background: #ffffff;
    border-radius: 8px;
    border: 1px solid var(--theme-border);
    box-shadow: var(--theme-shadow);
}

.timeline-nav-sidebar h5 {
    font-family: "Poppins", sans-serif;
    font-weight: 500;
    color: var(--theme-heading);
}

.timeline-event-count {
    font-family: "Poppins", sans-serif;
    font-size: 14px;
    font-weight: 500;
    color: var(--theme-text);
    padding-left: 2px;
}

#timeline-nav-container .timeline-year-btn {
    display: block;
    width: 100%;
    margin-bottom: 8px;
    text-align: left;
    font-family: "Poppins", sans-serif;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background-color: var(--theme-bg-light);
    border: 1px solid var(--theme-border);
    color: var(--theme-text);
    padding: 10px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
    text-decoration: none;
}

#timeline-nav-container .timeline-year-btn:hover,
#timeline-nav-container .timeline-year-btn:focus {
    background-color: var(--theme-bg-light);
    border-color: var(--theme-border);
    color: var(--theme-heading);
}

#timeline-nav-container .timeline-year-btn.active {
    background-color: var(--theme-accent) !important;
    border-color: var(--theme-accent) !important;
    color: #fff !important;
    box-shadow: 0 2px 5px rgba(249, 109, 0, 0.3);
}

.timeline {
    position: relative;
    width: 100%;
    margin: 0;
    padding: 0;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 19px;
    top: 20px;
    bottom: 20px;
    width: 4px;
    background-color: var(--theme-border);
    transform: translateX(-50%);
    border-radius: 2px;
}

.timeline-item-loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: var(--theme-text);
}
.timeline-item-loader p {
    margin-top: 15px;
    font-family: "Poppins", sans-serif;
}

.timeline-item {
    padding-left: 60px;
    padding-bottom: 40px;
    position: relative;
    width: 100%;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    content: "";
    position: absolute;
    top: 24px;
    left: 19px;
    width: 20px;
    height: 20px;
    background-color: white;
    border: 4px solid var(--theme-accent);
    border-radius: 50%;
    z-index: 1;
    transform: translateX(-50%);
}

.timeline-content {
    padding: 25px 30px;
    background-color: white;
    border: 1px solid var(--theme-border);
    border-radius: 8px;
    box-shadow: var(--theme-shadow);
    position: relative;
    transition: all 0.3s ease;
}

.timeline-content:hover {
    border-color: var(--theme-accent);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.07);
    transform: translateY(-3px);
}

.timeline-date {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--theme-accent);
    margin-bottom: 12px;
    display: inline-block;
}

.timeline-content h3 {
    font-size: 20px;
    font-weight: 500;
    color: var(--theme-heading);
    font-family: "Poppins", sans-serif;
    margin-bottom: 10px;
}

.timeline-content p {
    font-family: "Poppins", sans-serif;
    color: var(--theme-text);
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 15px;
}

.timeline-content .btn-primary {
    background: var(--theme-accent) !important;
    border: 1px solid var(--theme-accent) !important;
    color: #fff !important;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 8px 15px;
    border-radius: 4px;
}

.timeline-content .btn-primary:hover,
.timeline-content .btn-primary:focus,
.timeline-content .btn-primary:active {
    background: #f75800 !important;
    border-color: #f75800 !important;
    box-shadow: none !important;
}

@media screen and (max-width: 991px) {
    .timeline-nav-sidebar {
        position: relative;
        top: 0;
        margin-bottom: 30px;
        width: 100%;
    }

    #timeline-nav-container {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    #timeline-nav-container .timeline-year-btn {
        width: auto;
        margin: 4px;
    }

    .timeline::before {
        left: 19px;
    }

    .timeline-item {
        padding-left: 50px;
        padding-right: 0;
    }

    .timeline-dot {
        left: 19px;
    }
}