.quantum-page {
    min-height: 100vh;
    background:
        radial-gradient(circle at 50% 20%, rgba(0, 240, 255, 0.09), transparent 35rem),
        var(--page-gradient-base);
}

.quantum-page main {
    padding-top: 92px;
}

.quantum-skip-link {
    position: fixed;
    z-index: 10000;
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    background: var(--accent-blue);
    color: var(--primary-button-text);
    font-weight: 800;
    transform: translateY(-180%);
}

.quantum-skip-link:focus { transform: translateY(0); }

.quantum-page button:focus-visible,
.quantum-page select:focus-visible,
.quantum-page input:focus-visible,
.quantum-page summary:focus-visible,
.quantum-page a:focus-visible,
.quantum-page [tabindex="0"]:focus-visible {
    outline: 3px solid var(--accent-blue);
    outline-offset: 3px;
}

.quantum-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(18rem, 0.7fr);
    gap: 2rem;
    align-items: center;
    max-width: 1500px;
    margin: 0 auto;
    padding: 4.5rem 5% 2.5rem;
}

.quantum-hero h1 {
    margin: 0.35rem 0 1rem;
    font-size: clamp(2.4rem, 5vw, 5.6rem);
    line-height: 0.98;
    letter-spacing: -0.05em;
}

.quantum-hero > div > p:last-child,
.quantum-hero aside p {
    color: var(--text-secondary);
    line-height: 1.65;
}

.quantum-hero > div > p:last-child {
    max-width: 52rem;
    font-size: 1.08rem;
}

.quantum-hero aside,
.quantum-experiments,
.quantum-stage-panel,
.quantum-controls,
.quantum-explanation article,
.quantum-explanation details,
.quantum-visual-note {
    border: 1px solid var(--glass-border);
    background: var(--surface-panel);
    box-shadow: 0 18px 45px var(--shadow-soft);
}

.quantum-hero aside {
    padding: 1.5rem;
    border-radius: 16px;
}

.quantum-hero aside span,
.quantum-panel-label {
    color: var(--accent-blue);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.quantum-hero aside strong {
    display: block;
    margin-top: 0.45rem;
    font-size: 1.15rem;
}

.quantum-learning-path {
    display: grid;
    grid-template-columns: minmax(15rem, 0.7fr) minmax(0, 2fr);
    gap: 1rem 2rem;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto 1.25rem;
    padding: 1rem 1.25rem;
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    background: var(--surface-panel);
}

.quantum-learning-path p { margin: 0.25rem 0; }
.quantum-learning-path > div > p:last-child {
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.5;
}

.quantum-learning-path ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: quantum-step;
}

.quantum-learning-path li { counter-increment: quantum-step; }
.quantum-learning-path button {
    padding: 0.55rem 0.65rem;
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    background: var(--surface-soft);
    color: var(--text-primary);
    font: inherit;
    font-size: 0.7rem;
    cursor: pointer;
}

.quantum-learning-path button::before {
    content: counter(quantum-step) ". ";
    color: var(--accent-blue);
}

.quantum-learning-path button:hover,
.quantum-learning-path button[aria-current="step"] {
    border-color: var(--accent-blue);
    background: color-mix(in srgb, var(--accent-blue) 12%, var(--surface-soft));
}

.quantum-workbench {
    display: grid;
    grid-template-columns: minmax(13rem, 0.65fr) minmax(30rem, 2.25fr) minmax(14rem, 0.75fr);
    gap: 1rem;
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 3% 3rem;
}

.quantum-experiments,
.quantum-controls,
.quantum-stage-panel {
    border-radius: 16px;
    overflow: hidden;
}

.quantum-experiments,
.quantum-controls {
    padding: 1rem;
}

.quantum-experiment-list {
    display: grid;
    gap: 0.45rem;
    margin-top: 1rem;
}

.quantum-experiment-list button {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem;
    border: 1px solid transparent;
    border-radius: 9px;
    background: var(--surface-soft);
    color: var(--text-primary);
    font: inherit;
    font-size: 0.83rem;
    text-align: left;
    cursor: pointer;
}

.quantum-experiment-list button span {
    color: var(--text-secondary);
    font-size: 0.68rem;
    white-space: nowrap;
}

.quantum-experiment-list button:hover,
.quantum-experiment-list button:focus-visible,
.quantum-experiment-list button.active {
    border-color: var(--accent-blue);
    background: rgba(0, 240, 255, 0.1);
    outline: none;
}

.quantum-stage-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--glass-border);
}

.quantum-stage-header h2 {
    margin: 0.2rem 0 0;
    font-size: 1.2rem;
}

.quantum-experiment-intro {
    margin: 0;
    padding: 0.8rem 1.25rem;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.5;
}

#quantum-status-badge {
    color: var(--accent-blue);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

#quantum-event-count {
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.quantum-stage {
    position: relative;
    min-height: 24rem;
    background:
        linear-gradient(rgba(0, 240, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.025) 1px, transparent 1px),
        #050914;
    background-size: 32px 32px;
    overflow: hidden;
}

#quantum-canvas {
    display: block;
    width: 100%;
    height: 100%;
    min-height: 24rem;
}

.quantum-empty-state {
    position: absolute;
    z-index: 2;
    left: 50%;
    bottom: 1rem;
    width: min(28rem, calc(100% - 2rem));
    margin: 0;
    padding: 0.65rem 0.8rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.55rem;
    background: color-mix(in srgb, #050914 88%, transparent);
    color: #d7e4ea;
    font-size: 0.75rem;
    text-align: center;
    transform: translateX(-50%);
}

.quantum-empty-state[hidden] { display: none; }

.quantum-readouts {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid var(--glass-border);
}

.quantum-readouts div {
    padding: 0.85rem 1rem;
    border-right: 1px solid var(--glass-border);
}

.quantum-readouts div:last-child {
    border-right: 0;
}

.quantum-readouts span,
.quantum-readouts strong {
    display: block;
}

.quantum-seeing {
    padding: 0.8rem 1rem;
    border-top: 1px solid var(--glass-border);
}

.quantum-seeing summary {
    color: var(--text-primary);
    font-size: 0.78rem;
    font-weight: 800;
    cursor: pointer;
}

.quantum-seeing p {
    margin: 0.6rem 0 0;
    color: var(--text-secondary);
    font-size: 0.76rem;
    line-height: 1.55;
}

.quantum-readouts span {
    color: var(--text-secondary);
    font-size: 0.68rem;
    text-transform: uppercase;
}

.quantum-readouts strong {
    margin-top: 0.25rem;
    color: var(--accent-blue);
}

.quantum-controls {
    align-self: start;
}

.quantum-controls > label:not(.quantum-checkbox) {
    display: grid;
    gap: 0.4rem;
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.quantum-parameter-group {
    display: grid;
    gap: 0.8rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
}

.quantum-parameter-group[hidden] {
    display: none;
}

.quantum-parameter-group label {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.35rem 0.75rem;
    color: var(--text-secondary);
    font-size: 0.78rem;
}

.quantum-parameter-group label span {
    color: var(--accent-blue);
    font-variant-numeric: tabular-nums;
}

.quantum-parameter-group input[type="range"] {
    grid-column: 1 / -1;
    width: 100%;
    accent-color: var(--accent-blue);
}

.quantum-schematic-note {
    margin: 0;
    padding: 0.65rem 0.75rem;
    border-left: 2px solid var(--accent-blue);
    background: color-mix(in srgb, var(--panel-bg) 82%, transparent);
    color: var(--text-secondary);
    font-size: 0.72rem;
    line-height: 1.55;
}

.quantum-schematic-note strong { color: var(--text-primary); }

.quantum-complementarity {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.quantum-complementarity span {
    display: grid;
    gap: 0.2rem;
    padding: 0.55rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.55rem;
    color: var(--text-muted);
    font-size: 0.68rem;
}

.quantum-complementarity strong {
    color: var(--accent-blue);
    font-size: 0.82rem;
}

.quantum-view-switcher {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.35rem;
}

.quantum-view-switcher button {
    min-height: 2.5rem;
    padding: 0.4rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    background: var(--page-section-bg);
    color: var(--text-muted);
    font: inherit;
    font-size: 0.7rem;
    cursor: pointer;
}

.quantum-view-switcher button[aria-pressed="true"] {
    border-color: var(--accent-blue);
    color: var(--text-main);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent-blue) 45%, transparent);
}

.quantum-branch-counts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.72rem;
}

.quantum-branch-counts span {
    display: flex;
    justify-content: space-between;
    padding: 0.45rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
}

.quantum-joint-counts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
}

.quantum-joint-counts span,
.quantum-local-marginals p {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
    margin: 0;
    padding: 0.45rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.5rem;
    color: var(--text-muted);
    font-size: 0.72rem;
}

.quantum-local-marginals {
    display: grid;
    gap: 0.4rem;
}

.quantum-local-marginals p {
    display: grid;
}

.quantum-local-marginals span {
    color: var(--accent-blue);
    font-variant-numeric: tabular-nums;
}

.quantum-inline-button {
    padding: 0.55rem 0.7rem;
    border: 1px solid var(--accent-blue);
    border-radius: 0.5rem;
    background: transparent;
    color: var(--text-main);
    font: inherit;
    font-size: 0.72rem;
    cursor: pointer;
}

.quantum-angle-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.65rem;
}

.quantum-chsh-cohorts,
.quantum-chsh-summary {
    display: grid;
    gap: 0.35rem;
}

.quantum-chsh-cohorts p {
    display: grid;
    gap: 0.15rem;
    margin: 0;
    padding: 0.4rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.45rem;
    font-size: 0.68rem;
}

.quantum-chsh-cohorts span {
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.quantum-chsh-summary {
    grid-template-columns: 1fr 1fr;
}

.quantum-chsh-summary span {
    display: grid;
    gap: 0.15rem;
    padding: 0.4rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.45rem;
    color: var(--text-muted);
    font-size: 0.68rem;
}

.quantum-chsh-summary strong {
    color: var(--accent-blue);
    font-size: 0.82rem;
}

.quantum-reality-controls h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.quantum-reality-controls select:disabled,
.quantum-reality-controls input:disabled {
    opacity: 0.45;
}

.quantum-assumption-ledger,
.quantum-reality-verdict,
.quantum-trial-audit {
    padding: 0.75rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.65rem;
    background: color-mix(in srgb, var(--page-section-bg) 80%, transparent);
}

.quantum-assumption-ledger dl {
    display: grid;
    gap: 0.35rem;
    margin: 0.6rem 0 0;
}

.quantum-assumption-ledger dl div {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 0.45rem;
    padding-top: 0.35rem;
    border-top: 1px solid var(--glass-border);
    font-size: 0.67rem;
}

.quantum-assumption-ledger dt { color: var(--text-muted); }
.quantum-assumption-ledger dd {
    margin: 0;
    color: var(--accent-blue);
}

.quantum-reality-diagnostics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
}

.quantum-reality-diagnostics div {
    display: grid;
    gap: 0.15rem;
    padding: 0.45rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.45rem;
    color: var(--text-muted);
    font-size: 0.67rem;
}

.quantum-reality-diagnostics strong {
    color: var(--accent-blue);
    font-variant-numeric: tabular-nums;
}

.quantum-challenges {
    display: grid;
    gap: 0.5rem;
    margin: 0;
    padding-left: 1.25rem;
    color: var(--text-muted);
    font-size: 0.7rem;
    line-height: 1.45;
}

.quantum-challenges span {
    display: block;
    color: var(--accent-blue);
}

.quantum-reality-verdict strong { color: var(--text-primary); }
.quantum-reality-verdict p {
    margin: 0.35rem 0 0;
    color: var(--text-muted);
    font-size: 0.72rem;
    line-height: 1.45;
}

.quantum-reality-verdict[data-level="qualified"],
.quantum-reality-verdict[data-level="success"] { border-color: #35d07f; }
.quantum-reality-verdict[data-level="failed"] { border-color: #ffb054; }

.quantum-trial-audit summary {
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.72rem;
}

.quantum-trial-audit code {
    display: block;
    margin-top: 0.55rem;
    overflow-wrap: anywhere;
    color: var(--accent-blue);
    font-size: 0.66rem;
    line-height: 1.5;
}

.quantum-controls select,
.quantum-controls input[type="text"] {
    width: 100%;
    box-sizing: border-box;
    padding: 0.7rem;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    background: var(--surface-soft);
    color: var(--text-primary);
    font: inherit;
}

.quantum-controls option {
    background: var(--page-section-bg);
}

.quantum-checkbox {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin-top: 1rem;
    color: var(--text-primary);
    font-size: 0.83rem;
}

.quantum-checkbox input {
    accent-color: var(--accent-blue);
}

.quantum-control-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.55rem;
    margin-top: 1.25rem;
}

.quantum-control-buttons button {
    min-height: 42px;
    padding: 0.6rem;
    border: 1px solid var(--accent-blue);
    border-radius: 8px;
    background: var(--accent-blue);
    color: var(--primary-button-text);
    font: inherit;
    font-size: 0.78rem;
    font-weight: 800;
    cursor: pointer;
}

.quantum-control-buttons button.secondary {
    background: transparent;
    color: var(--accent-blue);
}

.quantum-control-buttons button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

#quantum-control-note {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
    line-height: 1.5;
}

.quantum-explanation {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 5% 5rem;
}

.quantum-explanation article,
.quantum-explanation details,
.quantum-visual-note {
    padding: 1.35rem;
    border-radius: 14px;
}

.quantum-glossary {
    max-width: 1300px;
    margin: -3rem auto 5rem;
    padding: 1.25rem;
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    background: var(--surface-panel);
    color: var(--text-secondary);
}

.quantum-glossary > summary {
    color: var(--text-primary);
    font-weight: 800;
    cursor: pointer;
}

.quantum-glossary-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.6rem;
}

.quantum-glossary-grid p {
    display: grid;
    gap: 0.25rem;
    margin: 0;
    padding: 0.7rem;
    border: 1px solid var(--glass-border);
    border-radius: 0.55rem;
}

.quantum-glossary dfn {
    position: relative;
    width: fit-content;
    color: var(--accent-blue);
    font-style: normal;
    font-weight: 800;
    text-decoration: underline dotted;
    text-underline-offset: 0.2em;
    cursor: help;
}

.quantum-glossary dfn::after {
    position: absolute;
    z-index: 20;
    top: calc(100% + 0.5rem);
    left: 0;
    width: min(18rem, 72vw);
    padding: 0.6rem;
    border: 1px solid var(--accent-blue);
    border-radius: 0.45rem;
    background: #07101c;
    color: #f0f7fa;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    content: attr(data-tooltip);
    font-size: 0.72rem;
    font-weight: 400;
    line-height: 1.45;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.25rem);
    transition: opacity 120ms ease, transform 120ms ease;
}

.quantum-glossary dfn:hover::after,
.quantum-glossary dfn:focus::after {
    opacity: 1;
    transform: translateY(0);
}

.quantum-explanation h2 {
    margin: 0.4rem 0 0.6rem;
    font-size: 1.15rem;
}

.quantum-explanation p,
.quantum-explanation details {
    color: var(--text-secondary);
    line-height: 1.65;
}

.quantum-explanation summary {
    color: var(--text-primary);
    font-weight: 800;
    cursor: pointer;
}

.quantum-explanation code {
    color: var(--accent-blue);
}

.quantum-visual-note {
    grid-column: 1 / -1;
    margin: 0;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (prefers-reduced-motion: reduce) {
    .quantum-page *,
    .quantum-page *::before,
    .quantum-page *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

@media (max-width: 1100px) {
    .quantum-workbench {
        grid-template-columns: 14rem minmax(0, 1fr);
    }

    .quantum-controls {
        grid-column: 1 / -1;
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 1rem;
    }

    .quantum-controls .quantum-panel-label,
    .quantum-controls > .quantum-parameter-group,
    .quantum-control-buttons,
    #quantum-control-note {
        grid-column: 1 / -1;
    }
}

@media (max-width: 760px) {
    .quantum-page main { padding-top: 72px; }

    .quantum-hero {
        grid-template-columns: 1fr;
        padding-top: 3rem;
    }

    .quantum-learning-path {
        grid-template-columns: 1fr;
        margin-inline: 1rem;
    }

    .quantum-learning-path ol {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .quantum-learning-path button { width: 100%; }

    .quantum-workbench {
        grid-template-columns: 1fr;
        padding-inline: 1rem;
    }

    .quantum-experiments {
        overflow-x: auto;
    }

    .quantum-experiment-list {
        display: flex;
        min-width: max-content;
    }

    .quantum-experiment-list button {
        width: auto;
        min-width: 10rem;
    }

    .quantum-stage { min-height: 20rem; }
    #quantum-canvas { min-height: 20rem; }

    .quantum-readouts {
        grid-template-columns: 1fr 1fr;
    }

    .quantum-readouts div:nth-child(2) { border-right: 0; }
    .quantum-readouts div:nth-child(-n + 2) { border-bottom: 1px solid var(--glass-border); }

    .quantum-controls {
        grid-column: auto;
        grid-template-columns: 1fr;
    }

    .quantum-controls .quantum-panel-label,
    .quantum-control-buttons,
    #quantum-control-note {
        grid-column: auto;
    }

    .quantum-explanation {
        grid-template-columns: 1fr;
        padding-inline: 1rem;
    }

    .quantum-visual-note { grid-column: auto; }
    .quantum-glossary {
        margin: -3rem 1rem 4rem;
    }
    .quantum-glossary-grid { grid-template-columns: 1fr; }
}

@media (forced-colors: active) {
    .quantum-page button,
    .quantum-page select,
    .quantum-page input,
    .quantum-page details,
    .quantum-page canvas { forced-color-adjust: auto; }
}