/* ---- Intro ---- */
.concept-intro-section {
    position: relative;
    padding: 96px 0;
    margin-top: 64px;
    background: #111 url('/3res/assets/images/mv01.jpg') center / cover no-repeat;
}
.concept-intro-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(220, 222, 225, 0.87);
}
.concept-intro-text {
    position: relative;
    z-index: 1;
}
#main .concept-intro-lead {
    font-size: 1rem;
    line-height: 1.75;
    color: #0B0B0C;
    margin-bottom: 24px;
}
#main .concept-intro-lead:last-child {
    margin-bottom: 0;
}
#main .concept-intro-lead strong {
    font-weight: bold;
    color: #0B0B0C;
}

/* ---- コンセプト ---- */
.concept-tagline-section .pg-section__h2 {
    font-size: 2rem;
}
.concept-tagline-section {
    padding: 80px 0;
    background: #fff;
    border-top: 1px solid #E6E7EA;
}
.concept-tagline-lead {
    font-size: 2rem;
    font-weight: bold;
    line-height: 1.2;
    margin-bottom: 32px;
    color: #0B0B0C;
}
.concept-feature-grid {
    display: flex;
    gap: 16px;
    margin: 32px 0;
}
.concept-feature-item {
    flex: 1;
    background: #F7F8FA;
    padding: 24px 16px;
    text-align: center;
    font-size: 1rem;
    line-height: 1.6;
    color: #0B0B0C;
    display: flex;
    align-items: center;
    justify-content: center;
}
.concept-text-block {
    font-size: 1rem;
    line-height: 1.75;
    color: #0B0B0C;
    margin-bottom: 0;
}

/* ---- 3つのRe ---- */
.concept-re-section {
    padding: 80px 0;
    background: #fff;
}
.concept-re-section .pg-section__h2 {
    font-size: 2rem;
}
.concept-re-cards {
    display: flex;
    gap: 24px;
    margin-bottom: 64px;
}
.concept-re-card {
    flex: 1;
    background: #F7F8FA;
    border: 1px solid #E6E7EA;
    padding: 36px 24px;
    text-align: center;
}
.concept-re-card__en {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}
.concept-re-card__ja {
    display: block;
    font-size: 0.875rem;
    color: #0B0B0C;
    padding-bottom: 20px;
    margin-bottom: 20px;
    position: relative;
}
.concept-re-card__ja::after {
    content: '';
    display: block;
    width: 33%;
    height: 2px;
    background: #A6E635;
    margin: 12px auto 0;
}
.concept-re-card p {
    font-size: 1rem;
    line-height: 1.75;
    color: #0B0B0C;
    margin: 0;
    text-align: center;
}
.concept-youtube-wrap {
    max-width: 720px;
    margin: 0 auto;
}
.concept-youtube-wrap iframe {
    width: 100%;
    display: block;
}

/* ---- About 3REs ---- */
.concept-about-section {
    padding: 80px 0;
    background: #F7F8FA;
}
.concept-about-h2 {
    font-size: 2rem;
    font-weight: bold;
    line-height: 1.2;
    margin-bottom: 16px;
}
.concept-about-sub {
    font-size: 1rem;
    line-height: 1.75;
    color: #0B0B0C;
    margin-bottom: 40px;
}

/* ---- About ダイアグラム（top.css と共通） ---- */
.about-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin: 40px auto;
    max-width: 400px;
    padding: 32px;
    border: 1px solid #E6E7EA;
    background: #F7F8FA;
}
.about-diagram__center {
    background: #0B0B0C;
    color: #fff;
    padding: 10px 32px;
    font-size: 1.1rem;
    letter-spacing: 0.1em;
}
.about-diagram__mid {
    display: flex;
    gap: 40px;
    justify-content: center;
}
.about-diagram__box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    border: 1px solid #E6E7EA;
    padding: 14px 24px;
    font-size: 0.9rem;
    background: #fff;
    min-width: 100px;
}
.about-diagram__box--upcycle {
    flex-direction: row;
    gap: 10px;
}
.about-diagram__box--ec {
    text-align: center;
    gap: 4px;
}
.about-diagram__box--ec p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.6;
}
.about-diagram__arrow {
    font-size: 1.4rem;
    color: #6B8F76;
    line-height: 1;
}

/* ---- 3REsに参画する意義 ---- */
.concept-merit-section {
    padding: 80px 0;
}
.concept-merit-section .pg-section__h2 {
    font-size: 2rem;
}
.concept-merit {
    display: flex;
    gap: 24px;
}
.concept-merit-col {
    flex: 1;
    background: #F7F8FA;
    border: 1px solid #E6E7EA;
    padding: 36px 32px;
}
.concept-merit-col h3 {
    font-size: 1.5rem;
    font-weight: bold;
    text-align: center;
    padding-bottom: 12px;
    margin-bottom: 24px;
    margin-top: 0;
    letter-spacing: 0.06em;
}
.concept-merit-col h3::after {
    content: '';
    display: block;
    width: 33%;
    height: 2px;
    background: #A6E635;
    margin: 8px auto 0;
}
.concept-merit-col ul {
    list-style: none;
    padding: 0;
    margin: 0 auto 24px;
    max-width: fit-content;
}
.concept-merit-col ul li {
    padding: 6px 0;
    font-size: 1rem;
    line-height: 1.75;
}
.concept-merit-col ul li::before {
    content: '・';
}
.concept-merit-link-wrap {
    text-align: right;
    margin-top: 8px;
    padding-right: 16px;
}
.concept-merit-link {
    display: inline-block;
    font-size: 0.875rem;
    color: #0B0B0C;
    text-decoration: none;
    border-bottom: 1px solid #0B0B0C;
    padding-bottom: 2px;
}
.concept-merit-link:hover {
    opacity: 0.6;
}

/* ---- Responsive ---- */
@media (max-width: 787px) {
    .concept-intro-section {
        padding: 64px 0;
    }
    .concept-tagline-section,
    .concept-re-section,
    .concept-about-section,
    .concept-merit-section {
        padding: 50px 0;
    }
    .concept-tagline-section .pg-section__h2,
    .concept-re-section .pg-section__h2,
    .concept-merit-section .pg-section__h2 {
        font-size: 1.75rem;
    }
    .concept-tagline-lead {
        font-size: 1.25rem;
    }
    .concept-about-h2 {
        font-size: 1.25rem;
    }
    .concept-feature-grid {
        flex-direction: column;
    }
    .concept-re-cards {
        flex-direction: column;
    }
    .concept-youtube-wrap iframe {
        height: 220px;
    }
    .concept-merit {
        flex-direction: column;
    }
}