/* ---------- セクション共通 ---------- */
.section {
    padding: 6rem 1.5rem;
    border-top: 1px solid var(--color-line);
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* スタガーアニメーション — セクション内の子要素が順番にフェードイン */
.stagger-item {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.section.is-visible .stagger-item {
    opacity: 1;
    transform: translateY(0);
}

.section.is-visible .stagger-item:nth-child(1) { transition-delay: 0.05s; }
.section.is-visible .stagger-item:nth-child(2) { transition-delay: 0.12s; }
.section.is-visible .stagger-item:nth-child(3) { transition-delay: 0.19s; }
.section.is-visible .stagger-item:nth-child(4) { transition-delay: 0.26s; }
.section.is-visible .stagger-item:nth-child(5) { transition-delay: 0.33s; }
.section.is-visible .stagger-item:nth-child(6) { transition-delay: 0.40s; }
.section.is-visible .stagger-item:nth-child(7) { transition-delay: 0.47s; }

.section__inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section__header {
    margin-bottom: 3.5rem;
}

.section__label {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-green);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.section__title {
    font-size: 2rem;
    font-weight: 900;
    color: var(--color-navy);
    line-height: 1.4;
}

/* セクション区切り — 横線をセクション幅を超えて伸ばす */
.section::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-line);
}

/* 交互背景 */
.section--reason,
.section--voice,
.section--flow {
    background-color: var(--color-bg);
}