/* 制作の流れ：番号とタイトルが同じGrid行を共有する。 */
.section.section-flow {
    --flow-section-space: 5rem;
    --flow-title-size: clamp(1.125rem, 1.6vw, 1.375rem);
    background-color: var(--color-bg-sub);
    color: var(--color-text);
    color-scheme: light;
    padding-block: var(--section-space);
}

.flow-layout {
    width: 100%;
    max-width: var(--content-compact-max);
    margin-inline: auto;
    text-align: left;
}

.flow-layout > .top-section-title {
    margin: 0 0 var(--section-heading-gap);
    color: var(--color-main);
    font-size: var(--section-heading-size);
    font-weight: 700;
    line-height: 1.5;
    letter-spacing: 0.02em;
    text-align: center;
}

.flow-layout > .top-section-title-accent::first-letter {
    color: var(--color-highlight);
}

.flow-timeline {
    --flow-circle: 48px;
    --flow-step-height: 160px;
    --flow-gap: 24px;
    position: relative;
}

.flow-line {
    position: absolute;
    left: calc((var(--flow-circle) - 3px) / 2);
    top: 0;
    width: 3px;
    height: 0;
    background-color: var(--color-border);
    pointer-events: none;
}

.flow-line-fill {
    display: block;
    width: 100%;
    height: 100%;
    background-color: var(--color-accent);
    transform-origin: top center;
    transform: scaleY(0);
}

.flow-steps {
    margin: 0;
    padding: 0;
    list-style: none;
}

.flow-step {
    position: relative;
    display: grid;
    grid-template-columns: var(--flow-circle) minmax(0, 1fr);
    grid-template-rows: auto 1fr;
    align-items: start;
    column-gap: var(--flow-gap);
    row-gap: 0.5rem;
    min-height: var(--flow-step-height);
    padding-bottom: 1.5rem;
}

.flow-step:last-child {
    padding-bottom: 0;
}

.flow-step-num {
    grid-column: 1;
    grid-row: 1;
    align-self: center;
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--flow-circle);
    height: var(--flow-circle);
    border: 2px solid var(--color-accent);
    border-radius: 50%;
    background-color: var(--color-bg);
    color: var(--color-accent);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    z-index: 1;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.flow-step.is-reached .flow-step-num {
    background-color: var(--color-accent);
    color: var(--color-bg);
}

.flow-step-title {
    grid-column: 2;
    grid-row: 1;
    align-self: center;
    min-width: 0;
    margin: 0;
    font-size: var(--front-subheading-size);
    font-weight: 700;
    line-height: 1.5;
    overflow-wrap: anywhere;
}

.flow-step-title span {
    display: inline-block;
    max-width: 100%;
}

.flow-step-desc {
    grid-column: 2;
    grid-row: 2;
    min-width: 0;
    margin: 0;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text);
    overflow-wrap: anywhere;
}

.flow-step-body {
    grid-column: 2;
    grid-row: 2;
    min-width: 0;
}

.flow-step-body .flow-step-desc {
    display: block;
}

.flow-step-extra {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem 0.6rem;
    margin-top: 0.75rem;
    font-size: 0.875rem;
    line-height: 1.7;
}

:is(.home, .diagnosis-page, .operation-page) .flow-step-extra {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
}

.flow-step-extra-label {
    padding: 0.1rem 0.4rem;
    border: 1px solid #276a7a;
    border-radius: 4px;
    color: #276a7a;
    font-weight: 600;
    line-height: 1.5;
}

.flow-step-extra-text {
    color: #4a5560;
    font-weight: 400;
}

@media (max-width: 767px) {
    .section.section-flow {
        --flow-section-space: 2.5rem;
    }

    .flow-layout > .top-section-title {
        margin-bottom: 2rem;
    }

    .flow-timeline {
        --flow-circle: 40px;
        --flow-step-height: 0px;
        --flow-gap: 16px;
    }

    .flow-step {
        min-height: 0;
        padding-bottom: 2rem;
    }

    .flow-step:last-child {
        padding-bottom: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .flow-step .flow-step-num {
        background-color: var(--color-accent);
        color: var(--color-bg);
        transition: none;
    }
    .flow-line-fill {
        transform: scaleY(1);
    }
}