/* D-system product page operation-focused sections (2026-07-27)
   Design alignment: reuse existing D-system dark palette and common card/button patterns. */
html,
body {
    max-width: 100%;
    overflow-x: hidden;
}

.nav-menu .btn-cta-nav {
    white-space: nowrap;
    min-width: max-content;
}

.dsystem-ops-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    overflow-x: clip;
}

.dsystem-ops-section.bg-dark,
.dsystem-ops-section.dsystem-soft-bg {
    background: var(--color-bg-secondary);
}

.dsystem-ops-section *,
.dsystem-ops-section *::before,
.dsystem-ops-section *::after {
    box-sizing: border-box;
    min-width: 0;
}

.dsystem-ops-section .container {
    max-width: 1320px;
}

.dsystem-ops-section .section-header {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.dsystem-ops-section .section-title {
    color: var(--color-text-primary);
}

.dsystem-ops-section .section-description,
.dsystem-ops-section .section-subtitle {
    color: var(--color-text-secondary);
}

.dsystem-lead-card,
.dsystem-note-card,
.dsystem-support-card,
.dsystem-step-card,
.dsystem-feature-group,
.dsystem-comparison-card,
.dsystem-industry-card,
.dsystem-link-card,
.dsystem-flow-step,
.dsystem-mini-thumb {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
}

.dsystem-lead-card {
    max-width: 980px;
    margin: 0 auto;
    padding: clamp(1.5rem, 3vw, 2.5rem);
    border-left: 4px solid var(--color-accent);
}

.dsystem-lead-card p {
    margin: 0 0 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
}

.dsystem-lead-card p:first-child {
    color: var(--color-text-primary);
    font-size: clamp(1.05rem, 2vw, 1.18rem);
}

.dsystem-lead-card strong {
    color: var(--color-text-primary);
}

.dsystem-lead-card p:last-child { margin-bottom: 0; }

.dsystem-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    max-width: 980px;
    margin: 2rem auto 0;
}

.dsystem-stat-card {
    padding: clamp(1.25rem, 2.5vw, 1.75rem);
    text-align: center;
    background: var(--color-bg-card);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
}

.dsystem-stat-card .dsystem-stat-number {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1.05;
    letter-spacing: -0.02em;
    text-shadow: none;
}

.dsystem-stat-card .dsystem-stat-number small {
    font-size: 0.45em;
    color: var(--color-accent-hover);
    margin-left: 0.12em;
    vertical-align: baseline;
}

.dsystem-stat-card .dsystem-stat-label {
    margin-top: 0.7rem;
    color: var(--color-text-secondary);
    font-weight: 700;
    line-height: 1.6;
    text-shadow: none;
}

.dsystem-flow-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0.75rem;
    align-items: stretch;
}

.dsystem-flow-step {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 100%;
    padding: 1.15rem;
}

.dsystem-flow-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -0.55rem;
    width: 0.75rem;
    height: 0.75rem;
    border-top: 2px solid rgba(74, 144, 226, 0.65);
    border-right: 2px solid rgba(74, 144, 226, 0.65);
    transform: translateY(-50%) rotate(45deg);
    background: transparent;
}

.dsystem-step-index {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: 999px;
    background: rgba(74, 144, 226, 0.14);
    border: 1px solid rgba(74, 144, 226, 0.45);
    color: var(--color-accent-hover);
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.dsystem-flow-step h3 {
    font-size: 1rem;
    margin: 0 0 0.5rem;
    color: var(--color-text-primary);
    line-height: 1.45;
}

.dsystem-flow-step p,
.dsystem-feature-group p,
.dsystem-link-card p,
.dsystem-step-card p,
.dsystem-comparison-card li,
.dsystem-industry-card p {
    margin: 0;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.dsystem-thumb-strip {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0.75rem;
    margin-top: 2rem;
}

.dsystem-mini-thumb {
    padding: 0.65rem;
}

.dsystem-mini-thumb img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 4 / 3;
    object-fit: contain;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    background: #ffffff;
}

.dsystem-mini-thumb figcaption {
    margin-top: 0.5rem;
    font-size: 0.82rem;
    line-height: 1.5;
    color: var(--color-text-secondary);
    font-weight: 700;
}

.dsystem-screen-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.85fr);
    gap: clamp(1.25rem, 3vw, 2rem);
    align-items: center;
}

.dsystem-screen-layout.reverse {
    grid-template-columns: minmax(280px, 0.85fr) minmax(0, 1.45fr);
}

.dsystem-screen-layout.reverse .dsystem-screen-media { order: 2; }
.dsystem-screen-layout.reverse .dsystem-screen-copy { order: 1; }

.dsystem-screen-layout.wide-media {
    grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.7fr);
}

.dsystem-screen-media,
.dsystem-image-card {
    margin: 0;
}

.dsystem-image-card {
    padding: 0.75rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.24);
}

.dsystem-image-button {
    display: block;
    width: 100%;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: zoom-in;
    text-align: inherit;
}

.dsystem-image-card img,
.dsystem-image-button img,
.dsystem-static-image {
    display: block;
    width: 100%;
    height: auto;
    object-fit: contain;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 14px;
    box-shadow: none;
    background: #ffffff;
    filter: none;
    opacity: 1;
}

.dsystem-image-button:focus-visible img {
    outline: 3px solid var(--color-accent-hover);
    outline-offset: 4px;
}

.dsystem-image-note,
.dsystem-image-caption {
    margin: 0.75rem 0 0;
    font-size: 0.86rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
}

.dsystem-image-note {
    text-align: center;
}

.dsystem-screen-copy h2,
.dsystem-screen-copy h3 {
    font-size: clamp(1.35rem, 2.4vw, 1.9rem);
    margin: 0 0 1rem;
    color: var(--color-text-primary);
    line-height: 1.35;
}

.dsystem-screen-copy p {
    color: var(--color-text-secondary);
    line-height: 1.9;
}

.dsystem-screen-copy .btn {
    margin-top: 1rem;
}

.dsystem-check-grid,
.dsystem-feature-grid,
.dsystem-support-grid,
.dsystem-industry-grid,
.dsystem-link-grid,
.dsystem-step-grid,
.dsystem-cast-groups,
.dsystem-accounting-grid,
.dsystem-web-grid,
.dsystem-customer-grid {
    display: grid;
    gap: 1rem;
}

.dsystem-check-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 1.25rem; }
.dsystem-feature-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.dsystem-cast-groups { grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 1.25rem; }
.dsystem-accounting-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.dsystem-web-grid { grid-template-columns: 1fr 1fr; align-items: start; }
.dsystem-customer-grid { grid-template-columns: 1.2fr 0.8fr; align-items: center; }
.dsystem-link-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.dsystem-industry-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.dsystem-step-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.dsystem-support-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.dsystem-check-list,
.dsystem-plain-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.65rem;
}

.dsystem-check-list li,
.dsystem-plain-list li {
    display: flex;
    gap: 0.55rem;
    align-items: flex-start;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.dsystem-check-list i,
.dsystem-plain-list i {
    color: var(--color-accent-hover);
    margin-top: 0.25rem;
    flex: 0 0 auto;
}

.dsystem-feature-group,
.dsystem-support-card,
.dsystem-step-card,
.dsystem-comparison-card,
.dsystem-industry-card,
.dsystem-link-card,
.dsystem-note-card {
    padding: clamp(1.15rem, 2vw, 1.5rem);
}

.dsystem-feature-group h3,
.dsystem-support-card h3,
.dsystem-step-card h3,
.dsystem-comparison-card h3,
.dsystem-industry-card h3,
.dsystem-link-card h3,
.dsystem-note-card h3 {
    margin: 0 0 0.75rem;
    color: var(--color-text-primary);
    font-size: 1.08rem;
    line-height: 1.45;
}

.dsystem-feature-tags,
.dsystem-mini-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.dsystem-feature-tags span,
.dsystem-mini-tags span {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    background: rgba(74, 144, 226, 0.12);
    border: 1px solid rgba(74, 144, 226, 0.28);
    color: var(--color-text-primary);
    font-weight: 700;
    font-size: 0.86rem;
}

.dsystem-comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.dsystem-comparison-card.before {
    border-top: 4px solid rgba(176, 176, 176, 0.55);
}

.dsystem-comparison-card.after {
    border-top: 4px solid var(--color-accent);
}

.dsystem-comparison-card li + li {
    padding-top: 0.65rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.dsystem-center-map {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    align-items: stretch;
}

.dsystem-center-node {
    grid-column: 2;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.18), rgba(255, 255, 255, 0.04));
    border: 1px solid rgba(74, 144, 226, 0.4);
    color: var(--color-text-primary);
    border-radius: 16px;
    padding: clamp(1.15rem, 2vw, 1.5rem);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
}

.dsystem-center-node h3,
.dsystem-center-node p,
.dsystem-link-card p {
    margin: 0 0 0.6rem;
}

.dsystem-center-node h3 { color: var(--color-text-primary); }
.dsystem-center-node p,
.dsystem-link-card p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}
.dsystem-center-node p:last-child,
.dsystem-link-card p:last-child { margin-bottom: 0; }

.dsystem-link-card {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.dsystem-link-card:hover,
.dsystem-link-card:focus-visible {
    transform: translateY(-3px);
    border-color: rgba(74, 144, 226, 0.6);
    box-shadow: 0 12px 28px rgba(74, 144, 226, 0.14);
    outline: none;
}

.dsystem-series-media {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 220px;
    min-height: 220px;
    padding: 0.75rem;
    margin-bottom: 0.85rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 14px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 8px 20px rgba(0, 0, 0, 0.16);
    overflow: hidden;
}

.dsystem-series-media img {
    display: block;
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 10px;
    background: transparent;
    filter: none;
    opacity: 1;
}

.dsystem-industry-card a,
.dsystem-text-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    min-height: 44px;
    color: var(--color-accent-hover);
    font-weight: 800;
    text-decoration: none;
}

.dsystem-industry-card a:hover,
.dsystem-text-link:hover {
    color: var(--color-text-primary);
    text-decoration: underline;
}

.dsystem-support-card i,
.dsystem-step-card .dsystem-step-index {
    margin-bottom: 0.8rem;
}

.dsystem-support-card i {
    color: var(--color-accent-hover);
    font-size: 1.6rem;
}

.dsystem-note-card {
    margin-top: 1rem;
    border-left: 4px solid var(--color-accent);
}

.dsystem-modal {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: clamp(0.75rem, 3vw, 2rem);
}

.dsystem-modal.is-open { display: flex; }

.dsystem-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.86);
}

.dsystem-modal-dialog {
    position: relative;
    z-index: 1;
    width: min(96vw, 1280px);
    max-height: 92vh;
    overflow: auto;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    padding: clamp(0.75rem, 2vw, 1.2rem);
    box-shadow: 0 24px 72px rgba(0, 0, 0, 0.52);
}

.dsystem-modal-close {
    position: sticky;
    top: 0;
    margin-left: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
    color: var(--color-text-primary);
    cursor: pointer;
    z-index: 2;
}

.dsystem-modal-close:focus-visible {
    outline: 3px solid var(--color-accent-hover);
    outline-offset: 3px;
}

.dsystem-modal-image {
    display: block;
    width: auto;
    max-width: 100%;
    height: auto;
    max-height: calc(92vh - 96px);
    margin: 0 auto;
    border-radius: 10px;
    background: #ffffff;
    filter: none;
    opacity: 1;
}

.dsystem-modal-caption {
    margin: 0.75rem 0 0;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

body.dsystem-modal-lock { overflow: hidden; }

@media (max-width: 1180px) {
    .dsystem-flow-grid,
    .dsystem-thumb-strip { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .dsystem-flow-step:not(:last-child)::after { display: none; }
    .dsystem-feature-grid,
    .dsystem-cast-groups { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
    .dsystem-screen-layout,
    .dsystem-screen-layout.reverse,
    .dsystem-screen-layout.wide-media,
    .dsystem-web-grid,
    .dsystem-customer-grid,
    .dsystem-comparison-grid {
        grid-template-columns: 1fr;
    }
    .dsystem-screen-layout.reverse .dsystem-screen-media,
    .dsystem-screen-layout.reverse .dsystem-screen-copy { order: initial; }
    .dsystem-link-grid,
    .dsystem-industry-grid,
    .dsystem-step-grid,
    .dsystem-support-grid,
    .dsystem-center-map { grid-template-columns: 1fr; }
    .dsystem-center-node { grid-column: auto; order: -1; }
    .dsystem-series-media {
        height: 240px;
        min-height: 240px;
    }
}

@media (max-width: 640px) {
    .dsystem-ops-section { padding: 3rem 0; }
    .dsystem-ops-section .container {
        width: min(100% - 1.5rem, 1200px);
        padding-left: 0;
        padding-right: 0;
    }
    .dsystem-ops-section .section-title,
    .dsystem-screen-copy h2,
    .dsystem-screen-copy h3 {
        overflow-wrap: anywhere;
        word-break: keep-all;
        line-height: 1.35;
    }
    .dsystem-lead-card,
    .dsystem-feature-group,
    .dsystem-support-card,
    .dsystem-step-card,
    .dsystem-comparison-card,
    .dsystem-industry-card,
    .dsystem-link-card,
    .dsystem-center-node,
    .dsystem-note-card {
        padding: 1.25rem;
    }
    .dsystem-stats-grid,
    .dsystem-flow-grid,
    .dsystem-thumb-strip,
    .dsystem-feature-grid,
    .dsystem-cast-groups,
    .dsystem-accounting-grid,
    .dsystem-check-grid { grid-template-columns: 1fr; }
    .dsystem-image-card { padding: 0.5rem; }
    .dsystem-image-card img,
    .dsystem-image-button img,
    .dsystem-static-image { border-radius: 12px; }
    .dsystem-series-media {
        height: 230px;
        min-height: 230px;
        padding: 0.65rem;
    }
    .dsystem-modal { padding: 0.5rem; align-items: flex-start; }
    .dsystem-modal-dialog {
        width: 100%;
        max-height: calc(100vh - 1rem);
        margin-top: 0.5rem;
        border-radius: 14px;
        -webkit-overflow-scrolling: touch;
    }
    .dsystem-modal-image {
        max-width: none;
        width: max-content;
        min-width: 100%;
        max-height: none;
    }
}