.selected-block {
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    align-items: center;
    padding: clamp(48px, 7vh, 82px) 0;
}

.selected-card {
    width: 100%;
    max-width: none;
    padding: 0;
    overflow: hidden;
    text-align: left;
}

.benefit-intro {
    padding: clamp(36px, 4vw, 54px) clamp(28px, 4vw, 56px) clamp(30px, 3.5vw, 46px);
}

.benefit-intro .label {
    display: inline-block;
}

.benefit-intro h2 {
    max-width: 1220px;
    margin: 10px 0 22px;
    font-size: clamp(3rem, 5.4vw, 5.4rem);
}

.benefit-intro p {
    max-width: 860px;
    margin: 0;
    font-size: 1.18rem;
}

.benefit-stack {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.benefit-stack section {
    min-height: 220px;
    padding: 28px clamp(26px, 3vw, 42px);
}

.benefit-stack section + section {
    border-left: 1px solid var(--color-border);
}

.benefit-number {
    display: block;
    margin-bottom: 14px;
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.14em;
}

.benefit-stack h3 {
    font-size: 2.2rem;
}

.benefit-stack p {
    margin: 12px 0 0;
    font-size: 0.98rem;
}

.system-detail {
    display: grid;
    grid-template-columns: minmax(230px, 0.4fr) minmax(0, 1.6fr);
    align-items: center;
    gap: clamp(26px, 4vw, 64px);
    padding: 25px clamp(28px, 4vw, 56px) 27px;
    background: rgba(6, 6, 6, 0.35);
}

.system-detail-label {
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    line-height: 1.5;
    text-transform: uppercase;
}

.system-detail p {
    max-width: none;
    margin: 0;
    color: #aaa;
    font-size: 0.98rem;
    line-height: 1.6;
}

.system-detail strong {
    color: #fff;
    font-weight: 600;
}

.preview-language {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 20;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px;
    border: 1px solid var(--color-border);
    background: rgba(8, 8, 8, 0.94);
}

.preview-language > span {
    padding-left: 5px;
    color: #666;
    font-family: var(--font-mono);
    font-size: 0.55rem;
    letter-spacing: 0.12em;
}

@media (max-width: 768px) {
    .selected-block {
        align-items: flex-start;
        padding: 42px 0 92px;
    }

    .benefit-intro {
        padding: 38px 24px 32px;
    }

    .benefit-intro h2 {
        font-size: clamp(2.5rem, 12vw, 4rem);
    }

    .benefit-intro p {
        font-size: 1.05rem;
    }

    .benefit-stack {
        grid-template-columns: 1fr;
    }

    .benefit-stack section {
        min-height: 0;
        padding: 25px 24px;
    }

    .benefit-stack section + section {
        border-top: 1px solid var(--color-border);
        border-left: 0;
    }

    .system-detail {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 26px 24px 30px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}

/* V1.1 communication core and public Experience loop. */
.benefit-stack h3 { font-size: clamp(1.4rem, 2vw, 2rem); line-height: 1.05; }
.system-detail > div { min-width: 0; }
.system-detail .experience-sequence { color: #fff; font-family: var(--font-mono); letter-spacing: .05em; margin-bottom: 12px; }
@media (max-width: 1100px) and (min-width: 769px) {
    .benefit-stack { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .benefit-stack section:nth-child(3) { border-left: 0; border-top: 1px solid var(--color-border); }
    .benefit-stack section:nth-child(4) { border-top: 1px solid var(--color-border); }
}