/* timeline.css */
#timeline-section .cards-container-timeline {
    --radius: 220px;
    --items: 1;
    position: relative;
    width: calc(var(--radius) * 2);
    height: calc(var(--radius) * 2);
    margin: 50px auto;
}
#timeline-section .cards-timeline {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.5s ease-in-out;
}
#timeline-section .cards-timeline li {
    position: absolute;
    inset: 0;
    transform-origin: center;
    display: grid;
    place-items: center;
    pointer-events: none;
}

#timeline-section .cards-timeline li > label {
    position: absolute;
    transform: translateY(calc(-1 * var(--radius) - 1rem));
    width: 25px;
    height: 25px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.25s ease;
    z-index: 10;
    pointer-events: auto;
    border: 4px solid transparent;
    background-clip: padding-box, border-box;
    background-origin: border-box;
}

/* gradients and shadows for circlesss */
#timeline-section .cards-timeline li:nth-child(3n+1) > label {
    background-image:
        linear-gradient(135deg, #3dd152, #6ee87f),
        linear-gradient(135deg, #3dd152, #6ee87f);
    background-clip: padding-box, border-box;
    box-shadow: 0 12px 28px rgba(61, 209, 82, 0.3);
}
#timeline-section .cards-timeline li:nth-child(3n+2) > label {
    background-image:
        linear-gradient(135deg, #3551ef, #6e7dff),
        linear-gradient(135deg, #3551ef, #6e7dff);
    background-clip: padding-box, border-box;
    box-shadow: 0 12px 28px rgba(53, 81, 239, 0.3);
}
#timeline-section .cards-timeline li:nth-child(3n) > label {
    background-image:
        linear-gradient(135deg, #f95f5f, #ff8a8a),
        linear-gradient(135deg, #f95f5f, #ff8a8a);
    background-clip: padding-box, border-box;
    box-shadow: 0 12px 28px rgba(249, 95, 95, 0.3);
}

#timeline-section .cards-timeline li > label:hover {
    filter: brightness(1.1);
    transform: translateY(calc(-1 * var(--radius) - 1rem)) scale(1.1);
    box-shadow: 0 0 20px rgba(0,0,0,0.15);
}

/* pop effect on click */
#timeline-section .cards-timeline li > label:active {
    transform: translateY(calc(-1 * var(--radius) - 1rem)) scale(1.2);
    box-shadow: 0 0 16px rgba(0,0,0,0.25);
}

#timeline-section .cards-timeline li > input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

#timeline-section .card-timeline {
    background: #fff;
    border-radius: 12px;
    padding: clamp(12px, 2vw, 20px);
    max-width: clamp(190px, 10vw, 240px);
    text-align: center;
    transition: all 0.4s ease;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    opacity: 0;
}
#timeline-section .card-timeline img {
    max-width: clamp(80px, 5vw, 100px);
    width: 80%;
    height: auto;
    margin-bottom: 12px;
    object-fit: contain;
    transition: transform 0.3s ease;
}
#timeline-section .card-timeline:hover img {
    transform: scale(1.05);
}
#timeline-section .card-timeline h2 {
    margin: 0 0 6px;
    font-size: clamp(0.8rem, 1.5vw, 0.5rem);
    color: #2c3e50;
}

#timeline-section .card-timeline p {
    font-size: clamp(0.65rem, 1vw, 0.2rem);
    color: #555;
    margin: 0;
}

#timeline-section .card-timeline.card-timeline--ec1092 h2 {
    font-size: clamp(0.58rem, 1.1vw, 0.78rem);
    line-height: 1.25;
}

#timeline-section .card-timeline.card-timeline--ec1092 p {
    font-size: clamp(0.6rem, 0.95vw, 0.7rem);
}
#timeline-section .cards-timeline li.active .card-timeline {
    opacity: 1;
    pointer-events: auto;
    border: 1px solid rgba(53, 81, 239, 0.3);
    background-clip: padding-box;
    box-shadow:
        0 0 8px rgba(61, 209, 82, 0.15),
        0 0 16px rgba(53, 81, 239, 0.15),
        0 0 24px rgba(249, 95, 95, 0.15);
    transition: all 0.4s ease;
}

/* media queries for responsiveness */
@media (max-width: 400px) {
    #timeline-section .card-timeline {
        padding: 10px;
        max-width: 85%;
    }

    #timeline-section .card-timeline img {
        max-width: 100px;
        margin-bottom: 8px;
    }

    #timeline-section .card-timeline h2 {
        font-size: 0.75rem;
    }

    #timeline-section .card-timeline p {
        font-size: 0.65rem;
    }

    #timeline-section .card-timeline.card-timeline--ec1092 h2 {
        font-size: 0.62rem;
    }

    #timeline-section .card-timeline.card-timeline--ec1092 p {
        font-size: 0.58rem;
    }

    #timeline-section .cards-timeline li > label {
        width: 24px;
        height: 24px;
    }
}

@media (max-width: 600px) {
    #timeline-section .cards-container-timeline {
        --radius: 140px;
    }
    #timeline-section .card-timeline {
        max-width: 150px;
        padding: 10px;
    }
    #timeline-section .card-timeline img {
        max-width: 80px;
    }
    #timeline-section .card-timeline h2 {
        font-size: 0.7rem;
    }
    #timeline-section .card-timeline p {
        font-size: 0.55rem;
    }

    #timeline-section .card-timeline.card-timeline--ec1092 h2 {
        font-size: 0.6rem;
    }

    #timeline-section .card-timeline.card-timeline--ec1092 p {
        font-size: 0.5rem;
    }
    #timeline-section .cards-timeline li > label {
        width: 24px;
        height: 24px;
    }
}

#timeline-section.timeline.fade-bg {
    background: linear-gradient(135deg, #d4f5dc, #b6eac5);
    background-size: 400% 400%;
    animation:
        gradientShift 20s ease-in-out,
        fadeToWhiteSoft 20s ease-in-out forwards,
        postFadeToWhite 30s ease-in-out forwards;
}

#timeline-section.timeline.pre-fade-bg {
    transition: background 0.5s ease-in-out;
    background: #eaf7ee;
}