:root {
    --mf-shell-font: "Inter", "SF Pro Display", "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    --mf-shell-ink: #f7f8ff;
    --mf-shell-muted: rgba(238, 242, 255, 0.68);
    --mf-shell-line: rgba(255, 255, 255, 0.16);
    --mf-shell-surface: rgba(7, 10, 18, 0.72);
    --mf-nav-height: 56px;
}

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

/* Shared navigation shell for every standalone experiment. */
:is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) {
    position: fixed;
    top: max(14px, env(safe-area-inset-top));
    right: max(14px, env(safe-area-inset-right));
    left: max(14px, env(safe-area-inset-left));
    z-index: 90;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    width: auto;
    max-width: 1180px;
    margin-inline: auto;
    min-height: var(--mf-nav-height);
    padding: 6px 8px;
    border: 1px solid var(--mf-shell-line);
    border-radius: 999px;
    color: var(--mf-shell-ink);
    background: var(--mf-shell-surface) !important;
    box-shadow: inset 0 1px rgba(255, 255, 255, 0.1), 0 18px 50px rgba(0, 0, 0, 0.24) !important;
    font-family: var(--mf-shell-font);
    backdrop-filter: blur(18px) saturate(1.3);
    -webkit-backdrop-filter: blur(18px) saturate(1.3);
    transform: none !important;
}

:is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) > a:first-child {
    display: inline-flex;
    width: fit-content;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    gap: 9px;
    padding: 0 13px;
    border-radius: 999px;
    color: var(--mf-shell-muted) !important;
    font-family: var(--mf-shell-font);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: none;
    touch-action: manipulation;
}

:is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) > a:first-child:hover,
:is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) > a:first-child:focus-visible {
    color: #fff !important;
    background: rgba(255, 255, 255, 0.1) !important;
}

:is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) > :nth-child(2) {
    display: flex;
    min-width: 0;
    align-items: center;
    justify-content: center;
    gap: 9px;
    margin: 0;
    overflow: hidden;
    color: var(--mf-shell-muted) !important;
    font-family: var(--mf-shell-font);
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.15em;
    text-overflow: ellipsis;
    text-transform: uppercase;
    white-space: nowrap;
}

:is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) > :last-child {
    grid-column: auto;
    justify-self: end;
    margin: 0;
    padding: 0 13px 0 8px;
    color: rgba(238, 242, 255, 0.5) !important;
    font-family: var(--mf-shell-font);
    font-size: 0.64rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

/* Keep interaction chrome consistent without flattening each experiment's art direction. */
:is(button, input, select, textarea, .next-link, .lab-next, .physics-next, .field-next, .motion-next) {
    font-family: var(--mf-shell-font);
}

:is(button, .next-link, .lab-next, .physics-next, .field-next, .motion-next) {
    min-height: 44px;
    touch-action: manipulation;
}

input[type="range"] {
    min-height: 44px;
    touch-action: manipulation;
}

.next-experiment .all-link {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    padding: 0 14px;
}

body[data-effect="elastic-bounds"] {
    --mf-focus-accent: var(--accent-2);
}

:is(a, button, input, select, textarea, [tabindex]):focus-visible {
    outline: 2px solid var(--mf-focus-accent, var(--accent, var(--cyan, var(--acid, var(--signal, #8be9ff)))));
    outline-offset: 4px;
}

:is(.next-link, .lab-next, .physics-next, .field-next, .motion-next) :is(small, span, strong, em) {
    min-width: 0;
}

:is(.lab-next, .field-next, .motion-next) > small {
    grid-column: 1;
    grid-row: 1;
}

:is(.lab-next, .field-next, .motion-next) > span {
    grid-column: 1;
    grid-row: 2;
}

:is(.lab-next, .field-next, .motion-next) > b {
    grid-column: 2;
    grid-row: 1 / 3;
    align-self: center;
    justify-self: end;
    font-style: normal;
}

.experiment-end-actions .motion-next {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-rows: auto auto;
    min-width: min(270px, 100%);
    gap: 2px 18px;
    padding: 10px 16px 10px 20px;
    text-align: left;
}

.experiment-end-actions .motion-next > small {
    grid-column: 1;
    grid-row: 1;
    opacity: 0.55;
    font-size: 0.52rem;
    letter-spacing: 0.14em;
}

.experiment-end-actions .motion-next > span {
    grid-column: 1;
    grid-row: 2;
}

.experiment-end-actions .motion-next > b {
    grid-column: 2;
    grid-row: 1 / 3;
    align-self: center;
    font-size: 1rem;
}

:is(.physics-readout, .motion-readout, .coordinate-readout, .cross-readout) {
    font-variant-numeric: tabular-nums;
}

.reorder-lab .physics-readout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.reorder-lab .physics-readout > div:first-child {
    grid-column: 1 / -1;
    padding-right: 0;
    border-bottom: 1px solid var(--line);
}

.reorder-lab .physics-readout > div:nth-child(2) {
    padding-left: 0;
    border-left: 0;
}

.reorder-lab [data-order] {
    overflow: visible;
    overflow-wrap: anywhere;
    text-overflow: clip;
    white-space: normal;
}

.zoom-description {
    width: min(560px, calc(100vw - 44px));
    margin: 18px auto 0;
    color: rgba(255, 255, 255, 0.7);
    font-size: clamp(0.76rem, 1.2vw, 0.9rem);
    line-height: 1.7;
    text-align: center;
    text-shadow: 0 2px 18px rgba(0, 0, 0, 0.6);
}

@media (max-width: 760px) {
    :is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) {
        grid-template-columns: minmax(0, 1fr) auto;
        right: max(10px, env(safe-area-inset-right));
        left: max(10px, env(safe-area-inset-left));
        min-height: 52px;
        padding: 4px 6px;
    }

    :is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) > :nth-child(2) {
        display: none;
    }

    :is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) > :last-child {
        grid-column: 2;
        padding-right: 10px;
    }

    .field-nav > a:first-child span:last-child {
        display: inline;
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .next-link span {
        display: block;
        overflow: hidden;
        font-size: 0.61rem;
        line-height: 1.25;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .next-link small {
        display: block;
        margin: 0;
        font-size: 0.54rem;
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .next-link {
        top: max(76px, calc(env(safe-area-inset-top) + 64px));
        right: max(12px, env(safe-area-inset-right));
        display: grid;
        grid-template-columns: minmax(0, 1fr) 44px;
        width: min(190px, calc(100% - 36px));
        gap: 8px;
        padding: 4px 4px 4px 13px;
        border: 1px solid var(--mf-shell-line);
        background: rgba(5, 7, 13, 0.74);
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .hero-copy {
        top: max(134px, calc(env(safe-area-inset-top) + 126px));
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .next-link i {
        width: 44px;
        height: 44px;
    }

    .live-state small {
        max-width: none;
        overflow: visible;
        text-overflow: clip;
        white-space: normal;
    }

    .lab-footer {
        right: max(12px, env(safe-area-inset-right));
        bottom: max(10px, env(safe-area-inset-bottom));
        left: max(12px, env(safe-area-inset-left));
    }

    :is(.magnetic-cluster, .reveal-grid, .shared-gallery, .mask-frame, .flip-workspace) {
        bottom: calc(env(safe-area-inset-bottom) + 76px);
    }

    :is(.morph-controls, .stroke-controls, .path-controls, .split-controls) {
        right: max(18px, env(safe-area-inset-right));
        bottom: calc(env(safe-area-inset-bottom) + 76px);
        left: max(18px, env(safe-area-inset-left));
    }

    .trail-stage .interaction-panel {
        bottom: calc(env(safe-area-inset-bottom) + 94px);
        left: max(18px, env(safe-area-inset-left));
    }

    .trail-stage .bottom-bar {
        right: max(18px, env(safe-area-inset-right));
        left: max(18px, env(safe-area-inset-left));
    }

    .gesture-chip {
        right: max(14px, env(safe-area-inset-right));
        bottom: calc(env(safe-area-inset-bottom) + 78px);
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .interaction-dock {
        right: max(18px, env(safe-area-inset-right));
        left: max(18px, env(safe-area-inset-left));
    }

    .motion-nav + main .fluid-content {
        padding-top: max(104px, calc(env(safe-area-inset-top) + 74px));
    }

    .expansion-chapter {
        top: max(98px, calc(env(safe-area-inset-top) + 74px), calc(var(--clip-y) + 22px));
    }

    .kinetic-typography .chapter-meta {
        top: max(102px, calc(env(safe-area-inset-top) + 74px));
    }

    body[data-effect="metaballs"] .hero-copy,
    .metaball-stage .hero-copy {
        top: max(105px, calc(env(safe-area-inset-top) + 74px));
    }

    body[data-effect="crosshair"] .lab-copy,
    body[data-effect="reveal"] .lab-copy,
    body[data-effect="marquee"] .lab-copy,
    body[data-effect="tilt"] .lab-copy,
    body[data-effect="morph"] .lab-copy,
    body[data-effect="stroke"] .lab-copy,
    body[data-effect="mask"] .lab-copy,
    body[data-effect="motion-path"] .lab-copy,
    body[data-effect="split"] .lab-copy,
    body[data-effect="flip"] .lab-copy,
    body[data-effect="shared"] .lab-copy,
    body[data-effect="magnetic"] .lab-copy {
        top: max(84px, calc(env(safe-area-inset-top) + 74px));
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .physics-lab {
        padding-top: max(75px, calc(env(safe-area-inset-top) + 68px));
    }

    body:is(
        [data-effect="rope-constraint"],
        [data-effect="collision-drag"],
        [data-effect="orbital-drag"],
        [data-effect="rubber-band-drag"],
        [data-effect="physics-reorder"]
    ) .physics-lab {
        padding-top: max(76px, calc(env(safe-area-inset-top) + 68px));
    }

    :is(.inertia-copy, .carousel-heading, .stack-copy, .morph-copy) {
        top: max(104px, calc(env(safe-area-inset-top) + 74px));
    }

    .horizontal-panel {
        padding-top: max(104px, calc(env(safe-area-inset-top) + 74px));
    }
}

.mobile-touch-hint {
    position: absolute;
    top: 14px;
    right: max(14px, env(safe-area-inset-right));
    z-index: 30;
    display: none;
    min-height: 44px;
    align-items: center;
    margin: 0;
    padding: 0 13px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    color: rgba(245, 247, 255, 0.72);
    background: rgba(7, 10, 18, 0.72);
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    pointer-events: none;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

@media (max-width: 600px) {
    .zoom-description {
        margin-top: 12px;
        font-size: 0.72rem;
        line-height: 1.55;
    }

    .mobile-touch-hint {
        display: inline-flex;
    }
}

@media (max-width: 820px) {
    .lab-next {
        right: max(14px, env(safe-area-inset-right));
        bottom: max(14px, env(safe-area-inset-bottom));
    }

    .gesture-chip {
        right: max(14px, env(safe-area-inset-right));
        bottom: calc(env(safe-area-inset-bottom) + 78px);
    }
}

@media (max-width: 900px) and (max-height: 700px) and (orientation: landscape) {
    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .physics-lab {
        grid-template-columns: minmax(250px, 0.78fr) minmax(0, 1.35fr);
        grid-template-rows: minmax(0, 1fr);
        gap: 12px;
        height: 100svh;
        padding: max(76px, calc(env(safe-area-inset-top) + 66px)) max(10px, env(safe-area-inset-right)) max(62px, calc(env(safe-area-inset-bottom) + 56px)) max(10px, env(safe-area-inset-left));
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .physics-copy {
        display: block;
        align-self: center;
        min-width: 0;
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .physics-copy h1 {
        font-size: clamp(2rem, 6vw, 3rem);
        line-height: 0.82;
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) :is(.physics-description, .physics-hint) {
        display: none;
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .physics-readout {
        width: 100%;
        margin-top: 9px;
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .physics-readout > div {
        padding-top: 7px;
        padding-bottom: 7px;
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .physics-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
        margin-top: 8px;
    }

    body[data-effect="spring-drag"] .physics-control {
        grid-template-columns: 58px minmax(30px, 1fr) 26px;
        gap: 5px;
        font-size: 0.45rem;
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .physics-stage {
        min-height: 0;
    }

    body:is(
        [data-effect="spring-drag"],
        [data-effect="elastic-bounds"],
        [data-effect="momentum-throw"],
        [data-effect="inertial-snap-grid"],
        [data-effect="magnetic-docking"]
    ) .mobile-touch-hint {
        display: inline-flex;
    }
}

@media (max-height: 700px) and (min-width: 901px) {
    .physics-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .physics-control {
        grid-template-columns: 72px minmax(36px, 1fr) 34px;
        gap: 7px;
    }
}

@media (max-height: 680px) and (orientation: landscape) {
    .metaball-stage .interaction-dock {
        display: flex;
        right: calc(max(14px, env(safe-area-inset-right)) + 178px);
        bottom: max(10px, env(safe-area-inset-bottom));
        left: max(14px, env(safe-area-inset-left));
    }

    .metaball-stage .next-link {
        right: max(14px, env(safe-area-inset-right));
        left: auto;
        width: 164px;
        min-width: 164px;
        min-height: 48px;
        padding: 0 14px;
    }

    .metaball-stage .live-state {
        min-height: 48px;
    }

    .metaball-stage .scatter-button {
        min-height: 48px;
    }

    .trail-stage .interaction-panel {
        display: block;
        top: auto;
        right: auto;
        bottom: calc(env(safe-area-inset-bottom) + 64px);
        left: max(18px, env(safe-area-inset-left));
        width: min(240px, 38vw);
        padding: 10px 12px;
    }

    .trail-stage .interaction-panel :is(.panel-label, .gesture-icon, dl) {
        display: none;
    }
}

@media (max-height: 650px) and (orientation: landscape) {
    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .lab-stage {
        height: 100dvh;
        min-height: 0;
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .hero-copy {
        top: 72px;
        left: max(18px, env(safe-area-inset-left));
        width: min(500px, 43vw);
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .hero-copy h1 {
        font-size: clamp(2.5rem, 7vw, 5.2rem);
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .next-link {
        top: 68px;
        right: max(12px, env(safe-area-inset-right));
        bottom: auto;
    }

    body:is(
        [data-effect="reaction-diffusion"],
        [data-effect="sdf-ray-marching"],
        [data-effect="gpgpu-particles"],
        [data-effect="lens-refraction"],
        [data-effect="rgb-shift"],
        [data-effect="afterimage-feedback"],
        [data-effect="volumetric-god-rays"],
        [data-effect="morph-targets"]
    ) .interaction-dock {
        right: auto;
        bottom: max(12px, env(safe-area-inset-bottom));
        left: max(14px, env(safe-area-inset-left));
    }

}

@media (prefers-reduced-motion: reduce) and (max-width: 820px) {
    .depth-portal {
        right: 50%;
        transform: translate3d(50%, -44%, 0);
    }

    .stack-sticky {
        display: block;
        padding: 100px 18px 90px;
    }

    .stack-scene {
        display: grid;
        grid-template-columns: 1fr;
        align-content: center;
    }

    .stack-count {
        position: absolute;
    }
}

@supports not (backdrop-filter: blur(1px)) {
    :is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) {
        background: rgba(7, 10, 18, 0.92) !important;
    }
}

@media (prefers-reduced-transparency: reduce) {
    :is(.motion-nav, .experiment-nav, .topbar, .lab-nav, .physics-nav, .field-nav) {
        background: #0d111c !important;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }
}