/* ==========================================================================
   Architecture page base
   ========================================================================== */

.architecture-copy h2 {
    margin: 7px 0 0;
    font-size: clamp(1.3rem, 2.1vw, 2.0rem);
    letter-spacing: -0.045em;
    line-height: 1.08;
}

.architecture-section {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(440px, 1.2fr);
    align-items: center;
    gap: clamp(54px, 8vw, 110px);
    padding: clamp(36px, 4.5vw, 60px) 0 clamp(60px, 7.5vw, 100px);
    border-top: 1px solid var(--line);
}

.architecture-section-stacked {
    display: block;
}

.architecture-copy > p:not(.section-kicker):not(.arch-overline) {
    margin: 22px 0 0;
    color: var(--muted);
}

.architecture-copy-wide {
    max-width: 800px;
}


/* Legacy architecture-page diagrams still used by the page ---------------- */

.cycle-diagram {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    margin: 50px 0 0;
    padding: 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    list-style: none;
    background: rgba(8, 8, 11, 0.82);
}

.cycle-diagram li {
    position: relative;
    min-height: 190px;
    padding: 24px 19px;
}

.cycle-diagram li + li {
    border-left: 1px solid var(--line);
}

.cycle-diagram li:not(:last-child)::after {
    position: absolute;
    z-index: 2;
    top: 50%;
    right: -7px;
    width: 13px;
    height: 13px;
    border-top: 1px solid var(--line-strong);
    border-right: 1px solid var(--line-strong);
    content: "";
    background: var(--background-elevated);
    transform: translateY(-50%) rotate(45deg);
}

.cycle-diagram span {
    color: var(--violet);
    font-family: var(--mono);
    font-size: 0.7rem;
}

.cycle-diagram strong,
.cycle-diagram small {
    display: block;
}

.cycle-diagram strong {
    margin-top: 35px;
    font-size: 0.92rem;
}

.cycle-diagram small {
    margin-top: 8px;
    color: var(--muted);
    line-height: 1.5;
}

.plain-list {
    display: grid;
    gap: 8px;
    margin: 26px 0 0;
    padding: 0;
    color: var(--text-soft);
    font-size: 0.9rem;
    list-style: none;
}

.plain-list li::before {
    margin-right: 10px;
    color: var(--violet);
    content: "—";
}

.clock-panel {
    padding: 34px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    background: radial-gradient(circle at 100% 0%, rgba(71, 127, 255, 0.14), transparent 38%),
    rgba(8, 8, 11, 0.9);
}

.clock-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    padding: 10px 0;
    color: var(--muted);
    font-family: var(--mono);
    font-size: 0.78rem;
}

.clock-row strong {
    color: var(--text);
    font-weight: 600;
}

.clock-divider {
    height: 1px;
    margin: 21px 0;
    background: var(--line);
}

.clock-ticks {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
}

.clock-ticks span {
    height: 9px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.08);
}

.clock-ticks span.active {
    background: linear-gradient(90deg, var(--blue), var(--violet));
    box-shadow: 0 0 20px rgba(113, 105, 255, 0.3);
}

.clock-panel > p {
    margin: 25px 0 0;
    color: var(--muted);
    font-size: 0.87rem;
}

.boundary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    margin-top: 45px;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.boundary-grid article {
    min-height: 250px;
    padding: 25px;
    background: rgba(8, 8, 11, 0.78);
}

.boundary-grid article + article {
    border-left: 1px solid var(--line);
}

.boundary-grid p {
    margin: 0 0 48px;
    color: var(--violet);
    font-family: var(--mono);
    font-size: 0.7rem;
    text-transform: uppercase;
}

.boundary-grid h3 {
    margin: 0;
    font-size: 1rem;
}

.boundary-grid span {
    display: block;
    margin-top: 10px;
    color: var(--muted);
    font-size: 0.86rem;
}

.architecture-callout {
    margin-top: 80px;
    margin-bottom: 0;
}

@media (max-width: 980px) {
    .architecture-section {
        grid-template-columns: 1fr;
    }

    .ownership-diagram,
    .clock-panel {
        width: 100%;
        max-width: 700px;
    }

    .cycle-diagram {
        grid-template-columns: repeat(3, 1fr);
    }

    .cycle-diagram li:nth-child(4) {
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .cycle-diagram li:nth-child(5),
    .cycle-diagram li:nth-child(6) {
        border-top: 1px solid var(--line);
    }

    .boundary-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .boundary-grid article:nth-child(3) {
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .boundary-grid article:nth-child(4) {
        border-top: 1px solid var(--line);
    }
}

@media (max-width: 760px) {
    .cycle-diagram,
    .boundary-grid {
        grid-template-columns: 1fr;
    }

    .cycle-diagram li + li,
    .cycle-diagram li:nth-child(4),
    .cycle-diagram li:nth-child(5),
    .cycle-diagram li:nth-child(6),
    .boundary-grid article + article,
    .boundary-grid article:nth-child(3),
    .boundary-grid article:nth-child(4) {
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .cycle-diagram li:not(:last-child)::after {
        top: auto;
        right: 50%;
        bottom: -7px;
        transform: translateX(50%) rotate(135deg);
    }
}

.architecture-page code {
    color: var(--text-soft);
    font-size: 1.0em;
}

.architecture-hero {
    padding-bottom: clamp(64px, 8vw, 105px);
}

.arch-overline {
    margin: 0 0 10px;
    color: var(--violet);
    font-family: var(--mono);
    font-size: .72rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
}

.architecture-hero .arch-overline {
    margin-bottom: 0;
}

.architecture-page .arch-overline {
    color: var(--violet);
}

.architecture-toc {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 34px;
}

.architecture-toc a {
    padding: 8px 12px;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    color: var(--text-soft);
    font-size: .78rem;
    text-decoration: none;
}

.architecture-toc a:hover,
.architecture-toc a:focus-visible {
    color: var(--text);
    border-color: rgba(166, 140, 255, .55);
    outline: none;
}

.arch-card {
    padding: 30px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    background: rgba(8, 8, 11, .84);
}

.arch-card h3 {
    margin: 0 0 22px;
    font-size: 1.05rem;
}

.arch-card p {
    margin: 22px 0 0;
    color: var(--muted);
    font-size: .88rem;
}

.arch-node {
    display: flex;
    min-height: 52px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 2px;
    padding: 10px;
    border: 1px solid var(--line-strong);
    border-radius: 8px;
    color: var(--text-soft);
    background: var(--surface-raised);
    font-family: var(--mono);
    font-size: .76rem;
    text-align: center;
}

.arch-node small {
    color: var(--muted);
    font-family: var(--sans);
    font-size: .68rem;
}

.arch-node.primary, .arch-node.accent {
    border-color: rgba(166, 140, 255, .5);
    color: var(--text);
    background: linear-gradient(135deg, rgba(84, 61, 188, .3), rgba(33, 33, 42, .95));
}

.arch-node.compact {
    min-height: 44px;
    font-size: .68rem;
}

.ownership-v2 {
    display: grid;
    gap: 20px;
}

.ownership-v2 > .primary {
    width: min(260px, 100%);
    margin: auto;
}

.ownership-pair {
    position: relative;
    display: grid;
    grid-template-columns:1fr 1fr;
    gap: 24px;
    padding-top: 23px;
}

.ownership-pair:before {
    position: absolute;
    top: 0;
    left: 25%;
    right: 25%;
    height: 1px;
    content: '';
    background: var(--line-strong);
}

.ownership-pair > div {
    position: relative;
    display: grid;
    gap: 7px;
}

.ownership-pair > div:before {
    position: absolute;
    top: -23px;
    left: 50%;
    width: 1px;
    height: 23px;
    content: '';
    background: var(--line-strong);
}

.ownership-pair span, .scene-owns {
    color: var(--muted);
    font-family: var(--mono);
    font-size: .65rem;
    text-align: center;
    text-transform: uppercase;
}

.drives {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 10px;
    border: 1px dashed var(--line);
    border-radius: 8px;
    color: var(--muted);
    font-size: .72rem;
}

.ownership-children {
    display: grid;
    grid-template-columns:repeat(2, 1fr);
    gap: 10px;
}

.arch-flow {
    display: grid;
    margin: 45px 0 0;
    padding: 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(8, 8, 11, .8);
    list-style: none;
}

.host-flow {
    grid-template-columns:repeat(6, 1fr);
}

.arch-flow li {
    position: relative;
    min-height: 150px;
    padding: 20px 16px;
}

.arch-flow li + li {
    border-left: 1px solid var(--line);
}

.arch-flow li:not(:last-child):after {
    position: absolute;
    z-index: 2;
    top: 50%;
    right: -6px;
    width: 11px;
    height: 11px;
    border-top: 1px solid var(--line-strong);
    border-right: 1px solid var(--line-strong);
    content: '';
    background: var(--background-elevated);
    transform: translateY(-50%) rotate(45deg);
}

.arch-flow b, .arch-flow strong, .arch-flow small {
    display: block;
}

.arch-flow b {
    color: var(--violet);
    font-family: var(--mono);
    font-size: .68rem;
}

.arch-flow strong {
    margin-top: 28px;
    font-size: .87rem;
}

.arch-flow small {
    margin-top: 7px;
    color: var(--muted);
    line-height: 1.4;
}

.arch-two-column {
    display: grid;
    grid-template-columns:1fr 1fr;
    gap: 22px;
    margin-top: 22px;
}

.scheduler-card dl {
    margin: 0;
}

.scheduler-card dl div {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 9px 0;
    border-bottom: 1px solid var(--line);
    font-family: var(--mono);
    font-size: .75rem;
}

.scheduler-card dt {
    color: var(--muted);
}

.scheduler-card dd {
    margin: 0;
    color: var(--text);
}

.ticks {
    display: grid;
    grid-template-columns:repeat(6, 1fr);
    gap: 7px;
    margin-top: 22px;
}

.ticks i {
    height: 8px;
    border-radius: 3px;
    background: rgba(255, 255, 255, .07);
}

.ticks i:nth-child(-n+2) {
    background: linear-gradient(90deg, var(--blue), var(--violet));
}

.step-flow {
    display: grid;
    gap: 0;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: step;
}

.step-flow li {
    position: relative;
    padding: 10px 12px 10px 38px;
    border-left: 1px solid var(--line-strong);
    color: var(--text-soft);
    font-size: .82rem;
}

.step-flow li:before {
    position: absolute;
    left: -9px;
    top: 12px;
    display: grid;
    width: 17px;
    height: 17px;
    place-items: center;
    border-radius: 50%;
    content: '';
    background: var(--violet);
    box-shadow: 0 0 16px rgba(166, 140, 255, .35);
}

.render-pipeline {
    display: grid;
    grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
    align-items: stretch;
    gap: 8px;
    margin-top: 45px;
}

.render-pipeline > div {
    display: flex;
    min-height: 125px;
    flex-direction: column;
    justify-content: center;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(8, 8, 11, .82);
    text-align: center;
}

.render-pipeline > span {
    align-self: center;
    color: var(--violet);
}

.render-pipeline small {
    color: var(--muted);
    font-family: var(--mono);
    font-size: .67rem;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.render-pipeline strong {
    margin-top: 10px;
    color: var(--text);
    font-family: var(--mono);
    font-size: .76rem;
    font-weight: 700;
    line-height: 1.25;
}

/* Render-pipeline phase colors -------------------------------------------- */

.render-pipeline > div {
    position: relative;
    overflow: hidden;
}

.render-pipeline > div::before {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 2px;
    content: "";
}


/* Scene state + traversal */

.render-pipeline > div:nth-of-type(1),
.render-pipeline > div:nth-of-type(2) {
    background: linear-gradient(
            180deg,
            rgba(75, 167, 255, .055),
            transparent 65%
    ),
    rgba(8, 8, 11, .82);
}

.render-pipeline > div:nth-of-type(1)::before,
.render-pipeline > div:nth-of-type(2)::before {
    background: var(--blue);
}


/* Extraction + packet construction */

.render-pipeline > div:nth-of-type(3),
.render-pipeline > div:nth-of-type(4),
.render-pipeline > div:nth-of-type(5) {
    background: linear-gradient(
            180deg,
            rgba(166, 140, 255, .055),
            transparent 65%
    ),
    rgba(8, 8, 11, .82);
}

.render-pipeline > div:nth-of-type(3)::before,
.render-pipeline > div:nth-of-type(4)::before,
.render-pipeline > div:nth-of-type(5)::before {
    background: var(--violet);
}


/* Backend + execution */

.render-pipeline > div:nth-of-type(6),
.render-pipeline > div:nth-of-type(7) {
    background: linear-gradient(
            180deg,
            rgba(255, 93, 134, .05),
            transparent 65%
    ),
    rgba(8, 8, 11, .82);
}

.render-pipeline > div:nth-of-type(6)::before,
.render-pipeline > div:nth-of-type(7)::before {
    background: var(--pink);
}


.frame-envelope {
    display: grid;
    grid-template-columns:repeat(6, 1fr);
    margin: 18px 0 0;
    padding: 0;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    list-style: none;
}

.frame-envelope li {
    position: relative;
    padding: 17px 10px;
    color: var(--text);
    font-size: .76rem;
    font-weight: 700;
    line-height: 1.25;
    text-align: center;
}

.frame-envelope li::before {
    position: relative;
    top: 0;
    right: 0;
    left: 0;
    height: 2px;
    content: "";
}

.frame-envelope li + li {
    border-left: 1px solid var(--line);
}

/* Rendering --------------------------------------------------------------- */

#rendering .architecture-copy-wide {
    max-width: none;
}

#rendering .architecture-copy h2 {
    margin-bottom: 24px;
}

#rendering .rendering-summary {
    width: 100%;
    max-width: none;
    margin: 0;
    color: var(--muted);
}

#rendering .rendering-summary code {
    color: var(--text-soft);
}

/* Render-frame phase colors ----------------------------------------------- */

.frame-envelope li:nth-child(1),
.frame-envelope li:nth-child(2) {
    background: linear-gradient(
            180deg,
            rgba(75, 167, 255, .055),
            transparent 65%
    );
}

.frame-envelope li:nth-child(1)::before,
.frame-envelope li:nth-child(2)::before {
    background: var(--blue);
}

.frame-envelope li:nth-child(3),
.frame-envelope li:nth-child(4) {
    background: linear-gradient(
            180deg,
            rgba(166, 140, 255, .055),
            transparent 65%
    );
}

.frame-envelope li:nth-child(3)::before,
.frame-envelope li:nth-child(4)::before {
    background: var(--violet);
}

.frame-envelope li:nth-child(5),
.frame-envelope li:nth-child(6) {
    background: linear-gradient(
            180deg,
            rgba(255, 93, 134, .05),
            transparent 65%
    );
}

.frame-envelope li:nth-child(5)::before,
.frame-envelope li:nth-child(6)::before {
    background: var(--pink);
}


/* Physics ----------------------------------------------------------------- */

.physics-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 460px;
    align-items: start;
    gap: clamp(54px, 7vw, 90px);
}

.physics-backend-card {
    width: 100%;
    margin-top: 44px;
    justify-self: end;
}

.physics-backend-card h3 {
    margin-bottom: 18px;
}

.backend-map > div {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1.15fr);
    align-items: center;
    gap: 12px;
    padding: 16px 0;
    border-top: 1px solid var(--line);
    font-size: .74rem;
}

.backend-map span {
    color: var(--violet);
}

.backend-map code {
    font-size: 1em;
}

/* Physics summary --------------------------------------------------------- */

.physics-summary-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-top: 38px;
}

.physics-summary-grid article {
    position: relative;
    min-width: 0;
    overflow: hidden;
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(8, 8, 11, .72);
}

.physics-summary-grid article::before {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 2px;
    content: "";
}

.physics-summary-grid article:first-child {
    background: linear-gradient(
            180deg,
            rgba(75, 167, 255, .055),
            transparent 65%
    ),
    rgba(8, 8, 11, .72);
}

.physics-summary-grid article:first-child::before {
    background: var(--blue);
}

.physics-summary-grid article:last-child {
    background: linear-gradient(
            180deg,
            rgba(166, 140, 255, .055),
            transparent 65%
    ),
    rgba(8, 8, 11, .72);
}

.physics-summary-grid article:last-child::before {
    background: var(--violet);
}

.physics-summary-grid h3 {
    margin: 0;
    color: var(--muted);
    font-family: var(--mono);
    font-size: .67rem;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.physics-summary-grid p {
    margin: 8px 0 0;
    color: var(--text);
    font-size: .76rem;
    font-weight: 700;
    line-height: 1.25;
}

@media (max-width: 760px) {
    .physics-summary-grid {
        grid-template-columns: 1fr;
    }
}

.arch-reference {
    margin: 22px 0 0;
    color: var(--muted);
    font-size: .85rem;
}

.arch-reference a {
    color: var(--text);
}

.other-detail-grid {
    display: grid;
    grid-template-columns:repeat(2, 1fr);
    gap: 22px;
    margin-top: 45px;
}

.other-detail-grid article {
    min-height: 330px;
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(8, 8, 11, .72);
}

.other-detail-grid h3 {
    margin: 0;
    font-size: 1.05rem;
}

.other-detail-grid article > p:last-child {
    margin: 20px 0 0;
    color: var(--muted);
    font-size: .86rem;
}

.detail-label {
    margin: 0 0 30px;
    color: var(--violet);
    font-family: var(--mono);
    font-size: .67rem;
    text-transform: uppercase;
}

.mini-fork {
    display: grid;
    justify-items: center;
    gap: 8px;
    margin-top: 24px;
}

.mini-fork > div {
    display: grid;
    width: 100%;
    grid-template-columns:1fr 1fr;
    gap: 10px;
}

.mini-fork code, .mini-import code {
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface-raised);
    font-size: .66rem;
    text-align: center;
}

.metric-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 24px;
}

.metric-cloud span {
    padding: 7px 9px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--text-soft);
    font-family: var(--mono);
    font-size: .63rem;
}

.mini-flow {
    display: grid;
    grid-template-columns:repeat(3, 1fr);
    gap: 7px;
    margin: 24px 0 0;
    padding: 0;
    list-style: none;
}

.mini-flow li {
    padding: 10px 7px;
    border: 1px solid var(--line);
    border-radius: 6px;
    color: var(--text-soft);
    font-size: .68rem;
    text-align: center;
}

.mini-import {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-top: 24px;
}

.mini-import span {
    color: var(--violet);
}

.mini-import code {
    flex: 1;
}

@media (max-width: 1100px) {
    .render-pipeline {
        grid-template-columns:repeat(7, 1fr);
    }

    .render-pipeline > span {
        display: none;
    }

    .render-pipeline > div {
        min-height: 105px;
    }

}

@media (max-width: 980px) {
    .physics-layout {
        grid-template-columns: 1fr;
    }

    .physics-backend-card {
        margin-top: 8px;
    }

    .host-flow {
        grid-template-columns:repeat(3, 1fr);
    }

    .arch-flow li:nth-child(4) {
        border-left: 0;
    }

    .arch-flow li:nth-child(n+4) {
        border-top: 1px solid var(--line);
    }

    .arch-two-column {
        grid-template-columns:1fr;
    }

    .render-pipeline {
        grid-template-columns:repeat(4, 1fr);
    }
}

@media (max-width: 760px) {
    .physics-summary-grid {
        grid-template-columns: 1fr;
    }

    .physics-summary-grid article + article {
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .architecture-toc {
        display: grid;
        grid-template-columns:1fr 1fr;
    }

    .ownership-pair, .ownership-children, .other-detail-grid, .render-pipeline, .frame-envelope {
        grid-template-columns:1fr;
    }

    .ownership-pair:before, .ownership-pair > div:before {
        display: none;
    }

    .drives {
        flex-direction: column;
    }

    .host-flow {
        grid-template-columns:1fr;
    }

    .arch-flow li + li, .arch-flow li:nth-child(4), .arch-flow li:nth-child(n+4), .frame-envelope li + li {
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    .arch-flow li:not(:last-child):after {
        top: auto;
        right: 50%;
        bottom: -6px;
        transform: translateX(50%) rotate(135deg);
    }

    .backend-map > div {
        grid-template-columns:1fr;
        text-align: center;
    }

    .backend-map > div span {
        transform: rotate(90deg);
    }

    .mini-import {
        flex-direction: column;
    }

    .mini-import code {
        width: 100%;
    }

    .other-detail-grid article {
        min-height: 0;
    }
}

.architecture-title-accent {
    color: #6f79b8;
}

/*.architecture-title-accent {*/
/*    color: transparent;*/
/*    background: linear-gradient(*/
/*            90deg,*/
/*            #668ed9,*/
/*            #8b7bd0*/
/*    );*/
/*    background-clip: text;*/
/*    -webkit-background-clip: text;*/
/*}*/

/*.architecture-title {*/
/*    color: var(--text);*/
/*}*/

/*.architecture-title-gradient {*/
/*    display: inline-block;*/
/*    max-width: 100%;*/
/*    color: transparent;*/
/*    background: linear-gradient(*/
/*            90deg,*/
/*            #628bd3 0%,*/
/*            #7185cd 24%,*/
/*            #986b7e 52%,*/
/*            #8a6b9d 72%,*/
/*            #7e73c8 100%*/
/*    );*/
/*    background-repeat: no-repeat;*/
/*    background-size: 100% 100%;*/
/*    background-clip: text;*/
/*    -webkit-background-clip: text;*/
/*    -webkit-text-fill-color: transparent;*/
/*}*/

.architecture-title-plain {
    color: var(--text);
    -webkit-text-fill-color: var(--text);
}

.architecture-section {
    align-items: stretch;
}

/*.ownership-diagram {*/
/*    align-self: start;*/
/*}*/

.placeholder-card {
    align-self: stretch;
    position: relative;

    background: linear-gradient(
            to top right,
            transparent calc(50% - 0.5px),
            #444 50%,
            transparent calc(50% + 0.5px)
    ),
    linear-gradient(
            to bottom right,
            transparent calc(50% - 0.5px),
            #444 50%,
            transparent calc(50% + 0.5px)
    );
}

/* ==========================================================================
   Ownership overview + Scene detail
   ========================================================================== */

.ownership-diagram {
    margin: 30px 0 6px;
    overflow: hidden;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    background: rgba(8, 8, 11, 0.82);
}

/* High-level ownership ----------------------------------------------------- */

.ownership-overview {
    padding: 26px 22px 24px;
    background: linear-gradient(
            180deg,
            rgba(92, 116, 196, 0.045),
            transparent 72%
    );
}

.ownership-application {
    width: 100%;
    color: var(--text);
}


/* Application -> Runner / Scene ------------------------------------------ */

.ownership-app-bus {
    position: relative;
    height: 34px;
}

.ownership-app-bus::before {
    position: absolute;
    top: 17px;
    right: 22.5%;
    left: 22.5%;
    border-top: 1px solid var(--line-strong);
    content: "";
}

.ownership-app-bus::after {
    position: absolute;
    top: 0;
    left: 50%;
    height: 18px;
    border-left: 1px solid var(--line-strong);
    content: "";
}

.ownership-app-drop {
    position: absolute;
    top: 17px;
    bottom: 0;
    border-left: 1px solid var(--line-strong);
}

.ownership-app-drop-runner {
    left: 22.5%;
}

.ownership-app-drop-scene {
    left: 77.5%;
}


/* Runner / Scene ---------------------------------------------------------- */

.ownership-main-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 64px minmax(0, 1fr);
    align-items: start;
}

.ownership-runner,
.ownership-scene-node {
    width: 100%;
    color: var(--text);
}

.ownership-reference {
    position: relative;
    height: 52px;
}

.ownership-reference::before {
    position: absolute;
    top: 50%;
    right: 6px;
    left: 0;
    border-top: 1px dashed rgba(255, 255, 255, 0.28);
    content: "";
}

.ownership-reference::after {
    position: absolute;
    top: 50%;
    right: 0;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    border-left: 6px solid rgba(255, 255, 255, 0.42);
    content: "";
    transform: translateY(-50%);
}

/* Scene -> major scene systems ------------------------------------------- */

.ownership-scene-bus {
    position: relative;
    padding-top: 17px;
}

/* Straight vertical drop from Scene to the child-row bus. */
.ownership-scene-bus::before {
    position: absolute;
    top: 0;
    left: calc(75% + 16px);
    height: 17px;
    border-left: 1px solid var(--line-strong);
    content: "";
}

.ownership-child-row {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 30px;
    padding-top: 17px;
}

/* Horizontal bus from the center of the first child to the fourth. */
.ownership-child-row::before {
    position: absolute;
    top: 0;
    right: calc((100% - 90px) / 8);
    left: calc((100% - 90px) / 8);
    border-top: 1px solid var(--line-strong);
    content: "";
}

/* No extra center drop anymore. */
.ownership-child-row::after {
    display: none;
}

.ownership-child-row .arch-node {
    position: relative;
    z-index: 2;
    width: 100%;
    min-height: 42px;
}

/* One drop from the horizontal bus into each child box. */
.ownership-child-row .arch-node::before {
    position: absolute;
    top: -17px;
    left: 50%;
    height: 17px;
    border-left: 1px solid var(--line-strong);
    content: "";
}

/* Responsive -------------------------------------------------------------- */

@media (max-width: 560px) {
    .ownership-overview {
        padding: 22px 18px 20px;
    }

    .ownership-app-bus {
        height: 24px;
    }

    .ownership-app-bus::before {
        top: 0;
        right: auto;
        bottom: 0;
        left: 50%;
        border-top: 0;
        border-left: 1px solid var(--line-strong);
    }

    .ownership-app-bus::after,
    .ownership-app-drop {
        display: none;
    }

    .ownership-main-row {
        grid-template-columns: 1fr;
    }

    .ownership-reference {
        width: 100%;
        height: 42px;
    }

    .ownership-reference::before {
        top: 0;
        right: auto;
        bottom: 0;
        left: 50%;
        border-top: 0;
        border-left: 1px dashed rgba(255, 255, 255, 0.28);
    }

    .ownership-reference::after {
        top: auto;
        right: auto;
        bottom: -1px;
        left: 50%;
        border-top: 6px solid rgba(255, 255, 255, 0.38);
        border-right: 4px solid transparent;
        border-bottom: 0;
        border-left: 4px solid transparent;
        transform: translateX(-50%);
    }

    .ownership-scene-bus {
        position: relative;
        padding-top: 20px;
    }

    .ownership-scene-bus::before,
    .ownership-child-row::before,
    .ownership-child-row::after,
    .ownership-child-row .arch-node::before {
        display: none;
    }

    .ownership-child-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
        padding-top: 0;
    }
}

@media (max-width: 430px) {
    .ownership-child-row {
        grid-template-columns: 1fr;
    }
}


/* Scene detail ------------------------------------------------------------ */

.ownership-diagram {
    --ownership-detail-line: rgba(166, 140, 255, 0.52);
}

.ownership-details {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    padding: 25px 22px 20px;
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(166, 140, 255, 0.025), transparent 45%),
    rgba(5, 5, 7, 0.22);
    /*margin-top: 6px;*/
    /*margin-left: 10px;*/
}

.ownership-detail-column {
    min-width: 0;
    padding-right: 24px;
}

.ownership-detail-column + .ownership-detail-column {
    padding-right: 0;
    padding-left: 24px;
    border-left: 1px solid var(--line);
    position: relative;
    left: 10px;
}

.ownership-detail-heading {
    display: flex;
    align-items: center;
    gap: 9px;
    margin: 0 0 20px;
    color: var(--muted);
    font-family: var(--mono);
    font-size: 0.64rem;
    font-weight: 700;
    letter-spacing: 0.11em;
    line-height: 1;
    text-transform: uppercase;
}

.ownership-detail-heading::before {
    width: 14px;
    height: 1px;
    flex: 0 0 auto;
    content: "";
    background: var(--violet);
    box-shadow: 0 0 10px rgba(166, 140, 255, 0.38);
}

.ownership-detail-heading::after {
    display: none;
}

.ownership-overview .arch-node {
    border-color: rgba(105, 145, 235, 0.78);
    color: var(--text);
    background: linear-gradient(
            135deg,
            rgba(55, 83, 160, 0.46),
            rgba(29, 34, 55, 0.95)
    );
}

/* Systems ----------------------------------------------------------------- */

.ownership-system-list {
    position: relative;
}

.ownership-system-list::before {
    display: none;
}

.ownership-system-item {
    position: relative;
    padding-left: 21px;
}

.ownership-system-item + .ownership-system-item {
    margin-top: 22px;
}

/* Draw only the connector to the next system; the final item has no tail. */
.ownership-system-list > .ownership-system-item:not(:last-child)::after {
    position: absolute;
    z-index: 0;
    top: calc(0.64rem + 6.5px);
    bottom: calc(-22px - 0.64rem - 6.5px);
    left: 6px;
    width: 1px;
    content: "";
    background: var(--ownership-detail-line);
}

.ownership-system-list,
.ownership-node-tree {
    transform: translate(10px, 6px);
}

.ownership-system-item::before {
    position: absolute;
    z-index: 1;
    top: calc(0.64rem - 2px);
    left: 0;
    width: 13px;
    height: 13px;
    border: 0;
    border-radius: 50%;
    content: "";
    background: var(--violet);
    box-shadow: 0 0 14px rgba(166, 140, 255, .45);
}

.architecture-page .ownership-system-name {
    color: var(--text);
    font-size: .92rem;
    font-weight: 600;
}

.ownership-system-item p {
    margin: 4px 0 9px;
    color: var(--text-soft);
    font-size: 0.72rem;
    line-height: 1.45;
}

.ownership-backend {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 5px;
}

.ownership-backend > .arch-api-link {
    display: inline-flex;
    align-items: center;
}

/*.ownership-backend-label {*/
/*    display: inline-flex;*/
/*    align-items: center;*/
/*    margin-right: 3px;*/
/*    color: var(--muted);*/
/*    font-family: var(--mono);*/
/*    font-size: 0.625rem;*/
/*    font-weight: 600;*/
/*    letter-spacing: 0.05em;*/
/*    line-height: 1;*/
/*    text-transform: uppercase;*/
/*    white-space: nowrap;*/
/*}*/

.ownership-backend-label {
    display: inline-flex;
    align-items: center;
    margin-right: 3px;
    color: var(--muted);
    font-family: var(--sans);
    /*font-family: var(--mono);*/
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    line-height: 1;
    text-transform: none;
    text-transform: uppercase;
    white-space: nowrap;
}

.ownership-backend code {
    position: relative;
    top: 0px;
    padding: 2px 5px;
    border: 1px solid var(--line);
    border-radius: 5px;
    color: var(--text-soft);
    background: rgba(255, 255, 255, 0.025);
    font-size: 0.58rem;
    line-height: 1.35;
    white-space: nowrap;
}

.ownership-backend-glfw {
    top: -1px;
}

.ownership-backend-glfw > span {
    position: relative;
    top: 1px;
}

.ownership-backend-arrow {
    position: relative;
    top: 0;
    color: rgba(166, 140, 255, 0.72);
    font-family: var(--mono);
    font-size: 0.62rem;
}

/* Node graph -------------------------------------------------------------- */

.ownership-node-tree {
    padding-top: 2px;
    color: var(--text-soft);
    font-family: var(--mono);
}

/* Node uses the same large-dot treatment as the Systems roots. */
.ownership-tree-root {
    margin: 0;
}

.ownership-tree-root::before {
    top: calc(0.64rem - 2px);
}

/*
 * Every level uses the same geometry:
 *
 *   trunk -> 24px branch -> dot -> text
 *
 * A nested trunk is positioned directly under the center of its parent dot,
 * so Mesh -> MeshElement/Material and PhysicsBody -> PhysicsShape connect
 * without gaps or special-case branch lengths.
 */
.ownership-tree {
    position: relative;
    margin: 0;
    padding: 0;
    list-style: none;
}

.ownership-tree::before {
    position: absolute;
    top: 0;
    bottom: 15px;
    left: 0;
    width: 1px;
    content: "";
    background: var(--ownership-detail-line);
}

/* Main trunk centered beneath the 13px Node dot. */
.ownership-tree-root-list {
    margin-top: 3px;
    margin-left: 6px;
}

.ownership-tree-root-list::before {
    top: -7px;
}

.ownership-tree-root .ownership-system-name {
    position: relative;
    top: 2px;
}

/*
 * Child dots are centered 28px from their trunk:
 * 25px dot offset + half of the 6px dot.
 * Nesting the next tree by 28px therefore puts its trunk directly beneath
 * the parent dot.
 */
.ownership-tree .ownership-tree {
    margin-left: 28px;
}

.ownership-tree .ownership-tree::before {
    top: -15px;
}

.ownership-tree > li {
    position: relative;
    margin: 0;
    padding: 0;
}

.ownership-tree-label {
    position: relative;
    display: flex;
    min-height: 30px;
    align-items: center;
    padding-left: 37px;
}

/*
 * Start one pixel after the vertical trunk so the two translucent lines touch
 * without overlapping. Every horizontal branch has the same length.
 */
.ownership-tree-label::before {
    position: absolute;
    top: 15px;
    left: 1px;
    width: 24px;
    height: 1px;
    content: "";
    background: var(--ownership-detail-line);
}

.ownership-tree-label::after {
    position: absolute;
    top: 12px;
    left: 25px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    content: "";
    background: var(--violet);
    box-shadow: 0 0 5px rgba(166, 140, 255, .20);
}

.ownership-tree-label code {
    color: var(--text-soft);
    font-family: var(--mono);
    font-size: 0.7rem;
    line-height: 1;
}

/* Responsive -------------------------------------------------------------- */

@media (max-width: 560px) {
    .ownership-details {
        grid-template-columns: 1fr;
        padding: 24px 18px 26px;
    }

    .ownership-detail-column {
        padding-right: 0;
    }

    .ownership-detail-column + .ownership-detail-column {
        margin-top: 27px;
        padding-top: 25px;
        padding-left: 0;
        border-top: 1px solid var(--line);
        border-left: 0;
    }
}

/* Simulation -------------------------------------------------------------- */

.simulation-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(320px, 350px);
    align-items: stretch;
    gap: clamp(36px, 4.5vw, 52px);
}

.simulation-copy {
    display: flex;
    min-width: 0;
    flex-direction: column;
}

.simulation-copy h2 {
    margin: 7px 0 0;
    font-size: clamp(1.3rem, 2.1vw, 2rem);
    letter-spacing: -0.045em;
    line-height: 1.08;
}

.simulation-copy > p:not(.arch-overline) {
    margin: 22px 0 0;
    color: var(--muted);
}

.simulation-detail-stack {
    display: grid;
    align-content: start;
    gap: 14px;
    margin-top: 27px;
}

.simulation-detail-stack .arch-card {
    padding: 22px 24px;
}

.simulation-detail-stack .arch-card h3 {
    margin-bottom: 18px;
}

.simulation-detail-stack .ticks {
    margin-top: 18px;
}

.simulation-step-card .step-flow li {
    padding-top: 8px;
    padding-bottom: 8px;
}


/* Compact host-update sequence -------------------------------------------- */

.simulation-host-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    margin-top: auto;
    padding: 0;
}

.simulation-host-flow li {
    display: flex;
    min-height: 76px;
    align-items: center;
    padding: 12px 10px 12px 18px;
}

.simulation-host-flow strong {
    margin: 0;
    font-size: 0.76rem;
    line-height: 1.25;
}


/* Responsive -------------------------------------------------------------- */

@media (max-width: 980px) {
    .simulation-layout {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .simulation-copy {
        display: block;
    }

    .simulation-detail-stack {
        grid-template-columns: 1fr 1fr;
        margin-top: 8px;
    }

    .simulation-host-flow {
        grid-template-columns: repeat(3, 1fr);
        margin-top: 30px;
    }
}

@media (max-width: 650px) {
    .simulation-detail-stack,
    .simulation-host-flow {
        grid-template-columns: 1fr;
    }
}

.simulation-step-card .step-flow {
    margin-left: 8px;
}

/* Host-update phase colors ------------------------------------------------ */

/* Host-update phase colors ------------------------------------------------ */

.simulation-host-flow li {
    position: relative;
}

.simulation-host-flow li::before {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 2px;
    content: "";
}

.simulation-host-flow li:nth-child(1),
.simulation-host-flow li:nth-child(2) {
    background: linear-gradient(
            180deg,
            rgba(75, 167, 255, .055),
            transparent 65%
    );
}

.simulation-host-flow li:nth-child(1)::before,
.simulation-host-flow li:nth-child(2)::before {
    background: var(--blue);
}

.simulation-host-flow li:nth-child(3) {
    background: linear-gradient(
            180deg,
            rgba(166, 140, 255, .055),
            transparent 65%
    );
}

.simulation-host-flow li:nth-child(3)::before {
    background: var(--violet);
}

.simulation-host-flow li:nth-child(4),
.simulation-host-flow li:nth-child(5) {
    background: linear-gradient(
            180deg,
            rgba(255, 93, 134, .05),
            transparent 65%
    );
}

.simulation-host-flow li:nth-child(4)::before,
.simulation-host-flow li:nth-child(5)::before {
    background: var(--pink);
}

.architecture-hero > h1 + p {
    max-width: none;
}