/*
 * Minty'Lab: scroll story, on the deep green. Like the dark band, the section
 * restates the text roles for everything inside it.
 *
 * Two states. By default (no JavaScript, reduced motion): the poster beside
 * the full list of steps. Once ml-scroll-video takes over it adds
 * .is-scrubbing: the stage grows a scroll length per step and the picture and
 * the steps stay on screen while it is scrolled through.
 */
:where([data-block]:has(> .mpb-story)) {
    margin-top: var(--spacing-section-xl);
    padding-block: 0;
}

.mpb-story {
    position: relative;
    padding-block: var(--spacing-section-xl);
    background-color: var(--color-deep);
    color: var(--color-on-dark);

    --color-text-muted: var(--color-on-dark-muted);
    --color-heading: var(--color-white);
    --color-eyebrow: var(--color-brand-medium);
}

.mpb-story__head {
    max-width: 45rem;
    margin-bottom: var(--spacing-3xl);
}

.mpb-story__title {
    margin: var(--spacing-md) 0 var(--spacing-lg);
    font-size: var(--font-size-display-section);
    font-weight: var(--font-weight-display);
    letter-spacing: var(--letter-spacing-display);
    line-height: var(--line-height-display);
}

.mpb-story__lead {
    margin: 0;
    font-size: var(--font-size-xl);
    line-height: var(--line-height-base);
}

.mpb-story__stage {
    display: block;
}

.mpb-story__sticky {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: var(--spacing-3xl);
    align-items: center;
}

.mpb-story__media {
    position: relative;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    border-radius: var(--border-radius-3xl);
    background-color: var(--color-deep);
}

.mpb-story__media img,
.mpb-story__media video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.mpb-story__media video {
    opacity: 0;
    transition: opacity var(--transition-slow);
}

/* The glow of the layers lifts the ground towards the edges of the picture:
   faded out there, the picture has no frame on the section. */
.mpb-story__media img,
.mpb-story__media video {
    mask-image: radial-gradient(ellipse 72% 72% at 50% 50%, black 62%, transparent 100%);
}

.mpb-story__stage.is-ready .mpb-story__media video {
    opacity: 1;
}

.mpb-story__steps {
    display: grid;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
    list-style: none;
}

.mpb-story__step {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--spacing-md);
    padding-left: var(--spacing-lg);
    border-left: 2px solid var(--color-on-dark-line);
    transition: opacity var(--transition-slow), border-color var(--transition-slow);
}

.mpb-story__index {
    font-family: var(--font-family-heading);
    font-size: var(--font-size-xl);
    color: var(--color-brand-medium);
}

.mpb-story__step h3 {
    margin: 0 0 var(--spacing-xs);
    font-size: var(--font-size-xl);
    color: var(--color-heading);
}

.mpb-story__step p {
    margin: 0;
    color: var(--color-text-muted);
}

/* Driven by the scroll: a scroll length per step, the scene held on screen. */
.mpb-story__stage.is-scrubbing {
    height: calc(100svh + var(--mpb-story-steps) * 55svh);
}

.mpb-story__stage.is-scrubbing .mpb-story__sticky {
    position: sticky;
    top: var(--header-offset);
    min-height: calc(100svh - var(--header-offset));
}

.mpb-story__stage.is-scrubbing .mpb-story__step {
    opacity: 0.32;
}

.mpb-story__stage.is-scrubbing .mpb-story__step.is-active {
    border-left-color: var(--color-mint);
    opacity: 1;
}

@media (max-width: 991.98px) {
    .mpb-story__sticky {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--spacing-xl);
    }

    /* On a phone the picture and one step: the step being shown. */
    .mpb-story__stage.is-scrubbing .mpb-story__sticky {
        align-content: center;
    }

    .mpb-story__stage.is-scrubbing .mpb-story__step:not(.is-active) {
        display: none;
    }
}