.visualization-card {
    margin: 30px 0;
    padding: clamp(18px, 2.8vw, 28px);
    max-width: 100%;
    overflow: hidden;
    border: 1px solid rgba(49, 87, 213, 0.15);
    border-radius: var(--card-radius, 8px);
    background:
        linear-gradient(145deg, rgba(255, 255, 255, 0.72), rgba(255, 253, 248, 0.96)),
        var(--surface);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.72) inset,
        var(--soft-shadow);
}

.visualization-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.visualization-header h2 {
    margin: 4px 0 0;
    color: var(--primary);
    line-height: 1.15;
}

.visualization-type-pill {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 8px 12px;
    border: 1px solid rgba(49, 87, 213, 0.22);
    border-radius: var(--radius-pill, 999px);
    color: var(--primary);
    background: var(--color-primary-soft, rgba(49, 87, 213, 0.08));
    font-weight: 850;
    white-space: nowrap;
}

.visualization-insights {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.visualization-insights div {
    margin: 0;
    min-height: 36px;
    padding: 7px 11px;
    border: 1px solid rgba(49, 87, 213, 0.14);
    border-radius: var(--radius-pill, 999px);
    background: rgba(255, 255, 255, 0.72);
    box-shadow: 0 6px 16px rgba(30, 40, 58, 0.05);
}

.visualization-insights span,
.diagram-library-attribution strong {
    display: inline;
    margin: 0 6px 0 0;
    color: var(--muted);
    font-size: 0.72rem;
    font-weight: 850;
    text-transform: uppercase;
}

.visualization-insights strong {
    color: var(--ink);
    font-size: 0.88rem;
    line-height: 1.35;
}

.diagram-library-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 16px;
    padding: 10px;
    border: 1px solid rgba(49, 87, 213, 0.1);
    border-radius: var(--card-radius, 8px);
    background: rgba(49, 87, 213, 0.045);
}

.diagram-library-toolbar .button-link,
.diagram-library-toolbar button {
    min-height: 42px;
    padding: 10px 14px;
    border-radius: var(--control-radius, 8px);
}

.diagram-library-figure {
    width: min(100%, 980px);
    max-width: 100%;
    margin: 0 auto;
}

.diagram-library-image-shell {
    --diagram-shell-padding: clamp(12px, 2vw, 22px);
    position: relative;
    display: block;
    width: 100%;
    height: clamp(320px, 52vw, 620px);
    overflow: hidden;
    border: 1px solid rgba(49, 87, 213, 0.14);
    border-radius: var(--card-radius, 8px);
    background:
        linear-gradient(135deg, var(--color-primary-soft, rgba(49, 87, 213, 0.08)), var(--color-secondary-soft, rgba(4, 125, 135, 0.08))),
        var(--surface-strong);
}

.diagram-library-image-shell::after {
    content: "Loading educational diagram...";
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: var(--muted);
    font-size: 0.94rem;
    font-weight: 850;
}

.diagram-library-image-shell::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.38), transparent);
    transform: translateX(-100%);
    animation: diagram-loading-sheen 1.5s ease-in-out infinite;
}

.diagram-library-image-shell:has(.diagram-library-image.is-loaded)::before {
    display: none;
}

.diagram-library-image-shell:has(.diagram-library-image.is-loaded)::after {
    display: none;
}

.diagram-library-image {
    position: absolute;
    inset: var(--diagram-shell-padding);
    display: block;
    width: calc(100% - (var(--diagram-shell-padding) * 2));
    height: calc(100% - (var(--diagram-shell-padding) * 2));
    max-width: none;
    max-height: none;
    object-fit: contain;
    cursor: zoom-in;
    opacity: 0;
    transform: translateZ(0);
    transition: opacity var(--transition-base, 220ms ease), transform var(--transition-base, 220ms ease);
}

.diagram-library-image.is-loaded {
    opacity: 1;
}

.diagram-pending-state {
    display: grid;
    gap: 14px;
    width: min(100%, 980px);
    margin: 0 auto;
}

.diagram-skeleton-frame {
    position: relative;
    display: grid;
    place-items: center;
    height: clamp(260px, 46vw, 520px);
    overflow: hidden;
    border: 1px solid rgba(49, 87, 213, 0.16);
    border-radius: var(--card-radius, 8px);
    color: var(--muted);
    background:
        linear-gradient(135deg, var(--color-primary-soft, rgba(49, 87, 213, 0.08)), var(--color-secondary-soft, rgba(4, 125, 135, 0.08))),
        var(--surface-strong);
    font-weight: 850;
}

.diagram-skeleton-frame::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.44), transparent);
    transform: translateX(-100%);
    animation: diagram-loading-sheen 1.45s ease-in-out infinite;
}

.diagram-skeleton-frame span {
    position: relative;
    z-index: 1;
}

.diagram-progress-copy {
    display: grid;
    gap: 5px;
    padding: 14px;
    border: 1px solid rgba(49, 87, 213, 0.14);
    border-radius: var(--card-radius, 8px);
    background: rgba(255, 255, 255, 0.72);
}

.diagram-progress-copy strong {
    color: var(--ink);
}

.diagram-progress-copy span {
    color: var(--muted);
    font-weight: 750;
}

.visualization-card.is-zoomed .diagram-library-image {
    cursor: zoom-in;
}

.visualization-card.is-fullscreen {
    position: fixed;
    inset: 16px;
    z-index: 2000;
    display: grid;
    grid-template-rows: auto auto 1fr;
    overflow: auto;
    margin: 0;
    background: var(--surface-strong);
}

.visualization-card.is-fullscreen .diagram-library-image-shell {
    height: calc(100vh - 220px);
    min-height: 420px;
}

.visualization-card.is-fullscreen .diagram-library-figure {
    width: min(100%, 1180px);
}

.visualization-card.is-fullscreen .diagram-library-image {
    max-height: none;
}

.diagram-library-attribution {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin-top: 12px;
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.45;
}

.diagram-library-attribution span {
    min-width: 0;
    padding: 9px 11px;
    border: 1px solid rgba(49, 87, 213, 0.12);
    border-radius: var(--control-radius, 8px);
    background: rgba(255, 255, 255, 0.72);
    overflow-wrap: anywhere;
}

.diagram-library-attribution a {
    color: var(--primary);
    font-weight: 800;
}

.diagram-explanation-panel {
    width: min(100%, 980px);
    margin: 18px auto 0;
}

.diagram-explanation-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: var(--card-radius, 8px);
    color: var(--muted);
    background: rgba(248, 250, 252, 0.82);
    font-weight: 800;
    opacity: 1;
    transition: opacity 0.18s ease;
}

.diagram-explanation-panel.is-loaded .diagram-explanation-status {
    opacity: 0;
}

.diagram-explanation-spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(49, 87, 213, 0.18);
    border-top-color: var(--primary);
    border-radius: 999px;
    animation: diagram-explanation-spin 0.8s linear infinite;
}

.diagram-explanation-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.22s ease, transform 0.22s ease;
}

.diagram-explanation-grid.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.diagram-explanation-card {
    min-width: 0;
    padding: clamp(14px, 2vw, 18px);
    border: 1px solid var(--line);
    border-radius: var(--card-radius, 8px);
    background: rgba(255, 255, 255, 0.76);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.72),
        0 8px 20px rgba(30, 40, 58, 0.05);
}

.diagram-explanation-card.is-wide {
    grid-column: 1 / -1;
}

.diagram-explanation-card h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 10px;
    color: var(--ink);
    font-size: 1rem;
    line-height: 1.3;
}

.diagram-explanation-card p,
.diagram-explanation-card li {
    color: var(--muted);
    font-weight: 700;
    line-height: 1.55;
}

.diagram-explanation-card p {
    margin: 0;
}

.diagram-explanation-list {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.diagram-explanation-list li {
    padding: 10px;
    border: 1px solid rgba(49, 87, 213, 0.12);
    border-radius: var(--control-radius, 8px);
    background: rgba(255, 255, 255, 0.7);
}

.diagram-explanation-list strong {
    display: block;
    margin-bottom: 3px;
    color: var(--ink);
}

.diagram-key-points {
    margin: 0;
    padding-left: 20px;
}

.diagram-related-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.diagram-related-topics form {
    margin: 0;
}

.diagram-related-topics button {
    min-height: 36px;
    padding: 8px 11px;
    border: 1px solid rgba(49, 87, 213, 0.2);
    border-radius: var(--control-radius, 8px);
    color: var(--primary);
    background: var(--surface-strong);
    box-shadow: none;
    font-weight: 850;
}

.diagram-lightbox[hidden] {
    display: none;
}

.diagram-lightbox {
    position: fixed;
    inset: 0;
    z-index: 3000;
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 12px;
    padding: clamp(14px, 2.5vw, 28px);
    background: rgba(248, 250, 252, 0.96);
    backdrop-filter: blur(14px);
}

.diagram-lightbox-close {
    justify-self: end;
    min-height: 42px;
    padding: 9px 14px;
    border: 1px solid var(--line);
    border-radius: var(--control-radius, 8px);
    color: var(--ink);
    background: var(--surface-strong);
    box-shadow: var(--soft-shadow);
    font-weight: 850;
}

.diagram-lightbox-stage {
    position: relative;
    display: block;
    min-height: 0;
    overflow: auto;
    border: 1px solid var(--line);
    border-radius: var(--card-radius, 8px);
    background:
        linear-gradient(135deg, var(--color-primary-soft, rgba(49, 87, 213, 0.07)), var(--color-secondary-soft, rgba(4, 125, 135, 0.07))),
        var(--surface-strong);
}

.diagram-lightbox-image {
    position: absolute;
    inset: 16px;
    display: block;
    width: calc(100% - 32px);
    height: calc(100% - 32px);
    max-width: none;
    max-height: none;
    object-fit: contain;
}

body.diagram-lightbox-open {
    overflow: hidden;
}

.visualization-info-card {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 16px;
    align-items: flex-start;
    margin-top: 10px;
    padding: clamp(16px, 2.4vw, 22px);
    border: 1px solid rgba(49, 87, 213, 0.18);
    border-radius: var(--card-radius, 8px);
    background:
        linear-gradient(135deg, var(--color-primary-soft, rgba(49, 87, 213, 0.1)), var(--color-secondary-soft, rgba(4, 125, 135, 0.08))),
        var(--surface);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.75);
}

.visualization-info-icon {
    display: inline-grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border: 1px solid rgba(49, 87, 213, 0.18);
    border-radius: var(--radius-sm, 8px);
    color: var(--primary);
    background: var(--surface-strong);
    font-size: 1.25rem;
    box-shadow: var(--soft-shadow);
}

.visualization-info-card h3 {
    margin: 0 0 8px;
    color: var(--ink);
    font-size: 1.08rem;
}

.visualization-info-card p {
    margin: 0;
    color: var(--muted);
    font-weight: 750;
    line-height: 1.55;
}

.visualization-info-card p + p {
    margin-top: 8px;
}

.diagram-learning-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0 0;
    padding: 0;
    list-style: none;
}

.diagram-learning-list li {
    padding: 7px 10px;
    border: 1px solid rgba(49, 87, 213, 0.16);
    border-radius: var(--control-radius, 8px);
    color: var(--ink);
    background: rgba(255, 255, 255, 0.72);
    font-weight: 800;
}

@keyframes diagram-loading-sheen {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

@keyframes diagram-explanation-spin {
    to {
        transform: rotate(360deg);
    }
}

.dark-mode .visualization-card,
.dark-mode .visualization-card.is-fullscreen {
    background: var(--surface);
    border-color: var(--line);
}

.dark-mode .visualization-type-pill,
.dark-mode .visualization-insights div,
.dark-mode .diagram-library-toolbar,
.dark-mode .diagram-library-attribution span,
.dark-mode .diagram-explanation-status,
.dark-mode .diagram-explanation-card {
    background: var(--color-primary-soft, rgba(134, 161, 255, 0.1));
    border-color: rgba(134, 161, 255, 0.18);
}

.dark-mode .visualization-type-pill {
    color: var(--primary);
}

.dark-mode .diagram-library-image-shell {
    background:
        linear-gradient(135deg, var(--color-primary-soft, rgba(134, 161, 255, 0.12)), var(--color-secondary-soft, rgba(92, 203, 211, 0.08))),
        var(--surface-strong);
    border-color: var(--line);
}

.dark-mode .diagram-library-image-shell::before {
    background: linear-gradient(90deg, transparent, rgba(134, 161, 255, 0.18), transparent);
}

.dark-mode .diagram-library-image-shell::after {
    color: var(--muted);
}

.dark-mode .diagram-skeleton-frame,
.dark-mode .diagram-progress-copy {
    border-color: rgba(134, 161, 255, 0.2);
    background: rgba(15, 23, 42, 0.72);
}

.dark-mode .diagram-skeleton-frame::before {
    background: linear-gradient(90deg, transparent, rgba(134, 161, 255, 0.18), transparent);
}

.dark-mode .visualization-info-card {
    background:
        linear-gradient(135deg, var(--color-primary-soft, rgba(134, 161, 255, 0.13)), var(--color-secondary-soft, rgba(92, 203, 211, 0.08))),
        var(--surface);
    border-color: rgba(134, 161, 255, 0.2);
}

.dark-mode .visualization-info-icon {
    color: var(--primary);
    background: var(--surface-strong);
    border-color: rgba(134, 161, 255, 0.22);
}

.dark-mode .diagram-learning-list li {
    color: var(--ink);
    background: var(--color-primary-soft, rgba(134, 161, 255, 0.1));
    border-color: rgba(134, 161, 255, 0.18);
}

.dark-mode .diagram-explanation-list li,
.dark-mode .diagram-related-topics button {
    background: var(--surface-strong);
    border-color: rgba(134, 161, 255, 0.2);
}

.dark-mode .diagram-lightbox {
    background: rgba(15, 23, 42, 0.96);
}

.dark-mode .diagram-lightbox-close {
    color: var(--ink);
    background: var(--surface);
    border-color: rgba(134, 161, 255, 0.22);
}

.dark-mode .diagram-lightbox-stage {
    background:
        linear-gradient(135deg, var(--color-primary-soft, rgba(134, 161, 255, 0.12)), var(--color-secondary-soft, rgba(92, 203, 211, 0.08))),
        var(--surface-strong);
    border-color: var(--line);
}

.exhibition-mode .diagram-library-figure {
    width: min(100%, 1040px);
}

@media (max-width: 760px) {
    .visualization-header,
    .diagram-library-toolbar {
        align-items: stretch;
        flex-direction: column;
    }

    .visualization-type-pill,
    .diagram-library-toolbar .button-link,
    .diagram-library-toolbar button {
        width: 100%;
        justify-content: center;
    }

    .visualization-insights,
    .diagram-library-attribution,
    .diagram-explanation-grid {
        grid-template-columns: 1fr;
    }

    .diagram-library-image-shell {
        --diagram-shell-padding: 10px;
        height: clamp(240px, 62vw, 340px);
    }

    .diagram-library-image {
        max-height: none;
    }

    .diagram-lightbox {
        padding: 10px;
    }

    .diagram-lightbox-close {
        width: 100%;
        justify-self: stretch;
    }

    .diagram-lightbox-image {
        inset: 10px;
        width: calc(100% - 20px);
        height: calc(100% - 20px);
        max-height: none;
    }

    .visualization-info-card {
        grid-template-columns: 1fr;
    }

    .visualization-info-icon {
        width: 42px;
        height: 42px;
    }
}