.project-modes {
    display: flex;
    gap: 0;
    margin: 2.5rem 0 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.project-modes button,
.demo-controls button,
.bridge-visual__capabilities button {
    min-height: 2.8rem;
    padding: 0.75rem 1.25rem;
    border: 0;
    border-right: 1px solid var(--line);
    background: transparent;
    color: var(--text-faint);
    font-family: var(--mono);
    font-size: 0.64rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
}

.project-modes button[aria-selected="true"],
.demo-controls button.is-active,
.bridge-visual__capabilities button.is-active { background: var(--accent); color: var(--bg-deep); }

.project[data-mode] .project__body { grid-template-columns: 1fr; }
.project[data-mode] .project__preview { min-height: auto; padding-left: 0; border-left: 0; }
.project-panel[hidden] { display: none; }
.project-panel { min-width: 0; }
.visual-label { margin-bottom: 1.5rem; color: var(--text-faint); font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; }

.human-overview { border-top: 1px solid var(--line-strong); }
.human-overview section { display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: 1.5rem; padding: 1.5rem 0; border-bottom: 1px solid var(--line); }
.human-overview section .section-index { margin: 0; }
.human-overview section strong { max-width: 42rem; font-family: var(--display); font-size: clamp(1.8rem, 3.2vw, 3.4rem); font-weight: 800; letter-spacing: -0.035em; line-height: 1; text-transform: uppercase; }
.human-overview section > p:last-child { max-width: 42rem; margin: 0; color: var(--text-soft); font-size: clamp(1.05rem, 1.5vw, 1.25rem); }
.human-overview footer { padding: 1.5rem 0; }
.human-overview footer > span { color: var(--accent); font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; }
.human-overview ul { display: flex; flex-wrap: wrap; gap: 0.6rem 1.4rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.human-overview li { color: var(--text-faint); font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase; }
.human-overview li::before { margin-right: 0.45rem; color: var(--accent); content: "+"; }
.architecture-contract { margin-top: clamp(4rem, 8vw, 8rem); }
.architecture-brief { max-width: 62rem; margin-bottom: clamp(3rem, 6vw, 6rem); padding-bottom: clamp(2rem, 4vw, 4rem); border-bottom: 1px solid var(--line); }
.architecture-brief .project__copy { max-width: 62rem; }

.system-contract { border: 1px solid var(--line-strong); background: var(--surface); }
.system-contract__header { display: flex; justify-content: space-between; padding: 0.85rem 1rem; border-bottom: 1px solid var(--line); color: var(--text-faint); font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.1em; text-transform: uppercase; }
.system-contract__identity { display: flex; min-height: 8rem; align-items: flex-end; justify-content: space-between; gap: 1rem; padding: 1.5rem; border-bottom: 1px solid var(--line); }
.system-contract__identity strong { font-family: var(--display); font-size: clamp(2rem, 4vw, 4rem); letter-spacing: -0.04em; line-height: 0.92; text-transform: uppercase; }
.system-contract__identity span { color: var(--accent); font-family: var(--mono); font-size: 0.62rem; text-transform: uppercase; }
.system-contract dl { margin: 0; }
.system-contract dl div { display: grid; grid-template-columns: 6rem 1fr; gap: 1rem; padding: 1rem 1.5rem; border-bottom: 1px solid var(--line); }
.system-contract dt,
.system-contract footer span { color: var(--text-faint); font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.08em; text-transform: uppercase; }
.system-contract dd { margin: 0; color: var(--text-soft); font-family: var(--mono); font-size: 0.76rem; line-height: 1.6; text-transform: uppercase; }
.system-contract footer { display: grid; grid-template-columns: 6rem 1fr; gap: 1rem; padding: 1rem 1.5rem; background: #0c0c0b; }
.system-contract footer b { color: var(--text-soft); font-family: var(--mono); font-size: 0.7rem; font-weight: 400; line-height: 1.6; text-transform: uppercase; }

.flow-diagram { display: grid; gap: 0.75rem; }
.diagram-node,
.engine-node {
    position: relative;
    display: flex;
    min-height: 3.8rem;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 1rem;
    border: 1px solid var(--line-strong);
    border-radius: 2px;
    background: var(--surface);
    color: var(--text-soft);
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    text-align: left;
    text-transform: uppercase;
    cursor: pointer;
    transition: border-color 180ms ease, color 180ms ease, opacity 180ms ease, background 180ms ease;
}
.diagram-node:not(:last-child)::after { position: absolute; bottom: -0.8rem; left: 50%; height: 0.8rem; border-left: 1px solid var(--accent-soft); content: ""; }
.diagram-node small, .engine-node small { color: var(--text-faint); font-size: 0.56rem; }
.diagram-node em,
.engine-node em { color: var(--text-faint); font-family: var(--body); font-size: 0.68rem; font-style: normal; font-weight: 400; letter-spacing: 0; line-height: 1.25; text-transform: none; }
.diagram-node:hover, .diagram-node.is-active, .engine-node:hover, .engine-node.is-active { border-color: var(--accent); background: #17150f; color: var(--text); }
.diagram-node.is-muted, .engine-node.is-muted { opacity: 0.38; }
.diagram-detail { min-height: 4.6rem; margin: 1.5rem 0 0; padding: 1rem 0 0; border-top: 1px solid var(--line); color: var(--text-soft); font-size: 0.9rem; }

.audio-visual__status { display: flex; justify-content: space-between; margin-bottom: 1rem; color: var(--accent); font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.08em; }
.flow-diagram--audio { grid-template-columns: repeat(7, minmax(5rem, 1fr)); gap: 0; }
.flow-diagram--audio .diagram-node { min-height: 7rem; justify-content: center; padding: 0.6rem; border-right: 0; text-align: center; }
.flow-diagram--audio .diagram-node { flex-direction: column; gap: 0.35rem; }
.flow-diagram--audio .diagram-node:last-child { border-right: 1px solid var(--line-strong); }
.flow-diagram--audio .diagram-node:not(:last-child)::after { top: 50%; right: -0.7rem; bottom: auto; left: auto; z-index: 2; width: 0.7rem; height: 1px; border: 0; background: var(--accent-soft); }
.flow-diagram--audio .diagram-node small { position: absolute; top: 0.5rem; right: 0.5rem; }
.wave-stack { display: grid; height: 5rem; align-content: center; gap: 0.35rem; margin-top: 1rem; overflow: hidden; opacity: 0.7; }
.wave-stack span { height: 1px; background: repeating-linear-gradient(90deg, transparent 0 4px, var(--accent) 5px 7px, transparent 8px 11px); background-size: 3rem 100%; animation: waveform 8s linear infinite; animation-delay: var(--WaveDelay); }

.demo-controls,
.bridge-visual__capabilities { display: flex; margin-bottom: 2.5rem; border: 1px solid var(--line); }
.distribution { display: grid; gap: 1.1rem; }
.distribution__row { display: grid; grid-template-columns: 7rem 1fr 4.2rem; gap: 1rem; align-items: center; font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.06em; text-transform: uppercase; }
.distribution__track { height: 1rem; background: var(--line); }
.distribution__track i { display: block; width: var(--Odds); height: 100%; background: var(--accent); transition: width 600ms cubic-bezier(0.2, 0.8, 0.2, 1); }
.distribution__row[data-rarity="rare"] i { background: #bd9950; }
.distribution__row[data-rarity="legendary"] i { background: var(--danger); }
.distribution__row output { color: var(--text-soft); text-align: right; }
.roll-visual__boundary { display: grid; grid-template-columns: auto 1fr; gap: 0.5rem 1.5rem; margin-top: 2.5rem; padding: 1.2rem 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 0.62rem; text-transform: uppercase; }
.roll-visual__boundary span { color: var(--text-faint); }
.roll-visual__boundary b { color: var(--text-soft); font-weight: 400; }
.architecture-secondary { margin-top: 3rem; }
.flow-diagram--compact { grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: 0; }
.flow-diagram--compact .diagram-node { min-height: 5rem; border-right: 0; }
.flow-diagram--compact .diagram-node { align-items: flex-start; flex-direction: column; justify-content: center; gap: 0.35rem; }
.flow-diagram--compact .diagram-node:last-child { border-right: 1px solid var(--line-strong); }
.flow-diagram--compact .diagram-node:not(:last-child)::after { display: none; }

.evolution { display: grid; grid-template-columns: minmax(15rem, 0.7fr) minmax(18rem, 1.3fr); gap: clamp(2rem, 6vw, 6rem); }
.evolution__rail { position: relative; display: grid; }
.evolution__rail::before { position: absolute; top: 2rem; bottom: 2rem; left: 2rem; width: 1px; background: var(--line-strong); content: ""; }
.evolution__stop { position: relative; display: grid; min-height: 5.5rem; grid-template-columns: 4rem 1fr; align-items: center; padding: 0; border: 0; background: transparent; color: var(--text-faint); text-align: left; cursor: pointer; }
.evolution__stop::before { position: absolute; left: 1.72rem; width: 0.6rem; height: 0.6rem; border: 1px solid var(--line-strong); background: var(--bg); content: ""; transform: rotate(45deg); }
.evolution__stop span { z-index: 1; font-family: var(--mono); font-size: 0.62rem; text-align: center; }
.evolution__stop b { font-family: var(--display); font-size: 1.25rem; letter-spacing: -0.02em; text-transform: uppercase; }
.evolution__stop.is-active, .evolution__stop:hover { color: var(--text); }
.evolution__stop.is-active::before { border-color: var(--accent); background: var(--accent); }
.evolution__readout { padding: clamp(1.5rem, 4vw, 4rem); border-left: 1px solid var(--line); }
.evolution__readout > p:not(.section-index) { min-height: 8rem; color: var(--text-soft); }
.evolution__readout strong { display: block; margin-top: 3rem; font-family: var(--display); font-size: clamp(2.3rem, 4vw, 4.5rem); letter-spacing: -0.04em; line-height: 0.95; text-transform: uppercase; }
.evolution__readout em { color: var(--accent); font-style: normal; }

.flow-diagram--music { width: 100%; max-width: 100%; grid-template-columns: repeat(7, minmax(6.5rem, 1fr)); gap: 0; overflow-x: auto; padding-bottom: 0.5rem; }
.flow-diagram--music .diagram-node { min-height: 8rem; border-right: 0; }
.flow-diagram--music .diagram-node:last-child { border-right: 1px solid var(--line-strong); }
.flow-diagram--music .diagram-node:not(:last-child)::after { top: 50%; right: -0.7rem; bottom: auto; left: auto; z-index: 2; width: 0.7rem; height: 1px; border: 0; background: var(--accent-soft); }
.render-manifest { display: grid; grid-template-columns: 6rem 1fr; gap: 0.5rem 1.5rem; margin-top: 2rem; padding: 1rem; border: 1px solid var(--line); font-family: var(--mono); font-size: 0.6rem; line-height: 1.7; text-transform: uppercase; }
.render-manifest span { color: var(--text-faint); }
.render-manifest b { color: var(--text-soft); font-weight: 400; }

.bridge-visual__capabilities { width: max-content; }
.sequence-diagram { display: grid; grid-template-columns: minmax(8rem, 0.4fr) minmax(14rem, 1fr) minmax(8rem, 0.4fr); align-items: stretch; min-height: 18rem; }
.sequence-diagram__actor { display: flex; flex-direction: column; align-items: center; border: 1px solid var(--line-strong); padding: 1.2rem; text-align: center; }
.sequence-diagram__actor::after { width: 1px; flex: 1; margin-top: 1rem; background: var(--line); content: ""; }
.sequence-diagram__actor b { font-family: var(--display); font-size: 1.3rem; text-transform: uppercase; }
.sequence-diagram__actor span { color: var(--text-faint); font-family: var(--mono); font-size: 0.58rem; text-transform: uppercase; }
.sequence-diagram__channel { display: flex; flex-direction: column; justify-content: space-around; padding: 2rem 0; }
.sequence-message { display: flex; align-items: center; color: var(--text-soft); font-family: var(--mono); font-size: 0.6rem; text-transform: uppercase; }
.sequence-message i { position: relative; height: 1px; flex: 1; background: var(--accent); }
.sequence-message--out i::after { position: absolute; right: 0; bottom: -3px; border-width: 4px 0 4px 6px; border-style: solid; border-color: transparent transparent transparent var(--accent); content: ""; }
.sequence-message--in i::before { position: absolute; bottom: -3px; left: 0; border-width: 4px 6px 4px 0; border-style: solid; border-color: transparent var(--accent) transparent transparent; content: ""; }
.sequence-message span { padding: 0.4rem 0.7rem; }
.bridge-visual__authority { padding: 1rem; border-left: 2px solid var(--accent); background: var(--surface); color: var(--text-soft); font-size: 0.85rem; }
.bridge-visual__authority span { margin-right: 1rem; color: var(--accent); font-family: var(--mono); font-size: 0.62rem; text-transform: uppercase; }
.bridge-visual[data-level="write"] .bridge-visual__authority { border-color: var(--danger); }

.engine-map { max-width: 88rem; margin: 0 auto; }
.engine-map__title { display: flex; justify-content: space-between; margin-bottom: 1rem; color: var(--accent); font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.1em; }
.engine-map__core { display: grid; place-items: center; padding: 2rem; border: 1px solid var(--line-strong); }
.engine-node--core { width: min(32rem, 100%); min-height: 7rem; border-color: var(--accent); color: var(--text); font-size: 0.9rem; }
.engine-map__surfaces { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 2rem; background: var(--line-strong); }
.engine-map__surfaces .engine-node { min-height: 8rem; border: 0; border-radius: 0; }
.engine-map__runtime { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 1px; background: var(--line); }
.engine-node--small { min-height: 5rem; border: 0; border-radius: 0; font-size: 0.6rem; }
.engine-map__play { display: flex; justify-content: flex-end; margin-top: 1rem; }
.engine-node--play { width: calc(33.333% - 1rem); border-color: var(--danger); }
.engine-node { align-items: flex-start; flex-direction: column; justify-content: center; gap: 0.35rem; }

.source-panel { display: grid; grid-template-columns: minmax(17rem, 0.7fr) minmax(18rem, 1.3fr); gap: clamp(2rem, 7vw, 7rem); min-height: 24rem; padding: 3rem 0; }
.source-panel h4 { margin: 1rem 0; font-family: var(--display); font-size: clamp(2rem, 5vw, 5rem); line-height: 1; text-transform: uppercase; }
.source-panel p { max-width: 34rem; color: var(--text-soft); }
.source-panel pre { min-height: 18rem; margin: 0; padding: clamp(1.2rem, 3vw, 2.5rem); overflow-x: auto; border: 1px solid var(--line); background: var(--surface); color: #d7d1c3; font: 0.8rem/1.8 var(--mono); white-space: pre-wrap; }
.source-panel__empty { padding: 2rem; border-left: 1px solid var(--line); }
.project__attribution { padding-left: 1rem; border-left: 2px solid var(--accent-soft); font-size: 0.85rem; }

@media (max-width: 900px) {
    .flow-diagram--audio { grid-template-columns: 1fr; }
    .flow-diagram--audio .diagram-node { min-height: 3.6rem; border-right: 1px solid var(--line-strong); border-bottom: 0; }
    .flow-diagram--audio .diagram-node:last-child { border-bottom: 1px solid var(--line-strong); }
    .flow-diagram--audio .diagram-node:not(:last-child)::after { top: auto; right: auto; bottom: -0.7rem; left: 50%; width: 1px; height: 0.7rem; }
    .flow-diagram--compact { grid-template-columns: 1fr; }
    .flow-diagram--compact .diagram-node { min-height: 3.8rem; border-right: 1px solid var(--line-strong); border-bottom: 0; }
    .flow-diagram--compact .diagram-node:last-child { border-bottom: 1px solid var(--line-strong); }
    .evolution, .source-panel { grid-template-columns: 1fr; }
    .engine-map__runtime { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
    .project-modes { overflow-x: auto; }
    .project-modes button { flex: 1; min-width: 7rem; }
    .human-overview section { grid-template-columns: 1fr; gap: 0.5rem; }
    .system-contract__identity { min-height: 6rem; align-items: flex-start; flex-direction: column; }
    .system-contract dl div,
    .system-contract footer { grid-template-columns: 1fr; gap: 0.35rem; }
    .demo-controls, .bridge-visual__capabilities { width: 100%; overflow-x: auto; }
    .demo-controls button, .bridge-visual__capabilities button { flex: 1; padding-right: 0.6rem; padding-left: 0.6rem; white-space: nowrap; }
    .distribution__row { grid-template-columns: 5.5rem 1fr 3.5rem; gap: 0.55rem; }
    .roll-visual__boundary, .render-manifest { grid-template-columns: 1fr; }
    .sequence-diagram { grid-template-columns: 6.5rem 1fr 6.5rem; min-height: 15rem; }
    .sequence-diagram__actor { padding: 0.7rem; }
    .sequence-diagram__actor b { font-size: 0.9rem; }
    .sequence-message span { max-width: 7.5rem; padding: 0.25rem; }
    .architecture-secondary { display: none; }
    .engine-map__surfaces { grid-template-columns: 1fr; }
    .engine-map__surfaces .engine-node { min-height: 5rem; }
    .engine-node--play { width: 100%; }
}