/* Photoelastic Stress Observatory / FRACTARIUM #85 */
.page-photoelastic-stress-observatory .lab-hero h1 {
    max-width: 16em;
    font-size: clamp(2.2rem, 5vw, 4.6rem);
    line-height: 0.98;
    overflow-wrap: anywhere;
}

.pe-app {
    --pe-panel: rgba(7, 22, 31, 0.94);
    --pe-line: rgba(117, 214, 226, 0.28);
    --pe-muted: #a9c4ca;
    --pe-cyan: #70e7ee;
    --pe-amber: #ffdc91;
    --pe-violet: #c5aaff;
    width: min(var(--max, 1380px), calc(100% - 32px));
    margin-inline: auto;
    padding: 0 0 2.2rem;
    color: #eaf7f8;
}

.pe-app *,
.pe-app *::before,
.pe-app *::after { box-sizing: border-box; }

.pe-route-chip {
    margin: 0 0 1rem;
    color: var(--pe-cyan);
    font-size: 0.72rem;
    font-weight: 750;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.pe-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.78fr);
    gap: 1rem;
    align-items: start;
}

.pe-stage,
.pe-controls,
.pe-readouts,
.pe-diagnostics,
.pe-notes article,
.pe-formula,
.pe-related {
    min-width: 0;
    border: 1px solid var(--pe-line);
    background: linear-gradient(145deg, rgba(13, 38, 51, 0.97), var(--pe-panel));
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.2);
}

.pe-stage,
.pe-controls,
.pe-readouts,
.pe-diagnostics,
.pe-formula,
.pe-related { padding: clamp(1rem, 2.2vw, 1.5rem); }

.pe-stage {
    background:
        radial-gradient(circle at 27% 30%, rgba(112, 231, 238, 0.10), transparent 32%),
        radial-gradient(circle at 76% 22%, rgba(255, 220, 145, 0.08), transparent 27%),
        linear-gradient(145deg, rgba(13, 38, 51, 0.97), var(--pe-panel));
}

.pe-stage-head,
.pe-controls-head,
.pe-card-head,
.pe-group-head {
    display: flex;
    gap: 1rem;
    justify-content: space-between;
    align-items: flex-start;
}

.pe-stage-head h2,
.pe-controls-head h2,
.pe-card-head h2,
.pe-notes h2,
.pe-formula h2,
.pe-related h2 {
    margin: 0.35rem 0 0.55rem;
    color: #f3fbfc;
    font-size: clamp(1.15rem, 2vw, 1.6rem);
    line-height: 1.2;
}

.pe-stage-head p:not(.eyebrow),
.pe-notes p,
.pe-formula > p:last-child,
.pe-related > p,
.pe-control-help,
.pe-shortcut-note p {
    color: var(--pe-muted);
    line-height: 1.65;
}

.pe-stage-head p:not(.eyebrow) { max-width: 680px; margin: 0; }
.pe-state-badge,
.pe-control-state,
.pe-card-badge,
.pe-group-head > span {
    display: inline-flex;
    min-height: 2rem;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    border: 1px solid rgba(112, 231, 238, 0.45);
    color: var(--pe-cyan);
    padding: 0.35rem 0.6rem;
    font-size: 0.7rem;
    font-weight: 750;
    letter-spacing: 0.1em;
    line-height: 1.2;
    text-align: center;
    text-transform: uppercase;
}

.pe-control-state,
.pe-group-head > span { border-color: rgba(197, 170, 255, 0.42); color: var(--pe-violet); }
.pe-card-badge { border-color: rgba(255, 220, 145, 0.52); color: var(--pe-amber); }

.pe-canvas-frame {
    position: relative;
    aspect-ratio: 12 / 7;
    min-height: 320px;
    margin-top: 1rem;
    overflow: hidden;
    border: 1px solid rgba(112, 231, 238, 0.30);
    background: #040a11;
    box-shadow: inset 0 0 80px rgba(77, 170, 193, 0.12);
}

.pe-canvas-frame::after {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    content: "";
    background:
        linear-gradient(rgba(112, 231, 238, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(112, 231, 238, 0.035) 1px, transparent 1px);
    background-size: 30px 30px;
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 88%);
}

#peCanvas {
    display: block;
    width: 100%;
    height: 100%;
    min-height: 180px;
    outline: none;
    touch-action: none;
}

#peCanvas:focus-visible { box-shadow: inset 0 0 0 2px var(--pe-cyan); }
.pe-canvas-fallback { padding: 1.2rem 1.3rem; color: var(--pe-muted); line-height: 1.6; }
.pe-canvas-fallback strong { color: var(--pe-amber); }
.pe-canvas-help,
.pe-live { margin: 0.8rem 0 0; color: var(--pe-muted); font-size: 0.83rem; line-height: 1.55; }
.pe-live { color: var(--pe-cyan); }

.pe-metrics,
.pe-readout-grid,
.pe-validation-grid { margin: 1rem 0 0; }

.pe-metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.5rem;
}

.pe-metrics div,
.pe-readout-grid div,
.pe-validation-grid div {
    min-width: 0;
    padding: 0.65rem 0.7rem;
    border: 1px solid rgba(117, 214, 226, 0.16);
    background: rgba(3, 11, 17, 0.36);
}

.pe-metrics dt,
.pe-readout-grid dt,
.pe-validation-grid span {
    color: var(--pe-muted);
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    line-height: 1.35;
    text-transform: uppercase;
}

.pe-metrics dd,
.pe-readout-grid dd { margin: 0.25rem 0 0; color: #f1fbfc; font-size: 1rem; font-weight: 700; overflow-wrap: anywhere; }

.pe-controls { display: grid; gap: 1rem; }
.pe-control-group,
.pe-shortcut-note { padding-top: 1rem; border-top: 1px solid rgba(117, 214, 226, 0.18); }
.pe-control-group:first-of-type { padding-top: 0; border-top: 0; }
.pe-group-head { align-items: center; margin-bottom: 0.6rem; }
.pe-group-head h3,
.pe-shortcut-note h3 { margin: 0; color: var(--pe-cyan); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; }
.pe-group-head > span { min-height: 1.65rem; padding: 0.2rem 0.45rem; font-size: 0.62rem; }

.pe-button-grid,
.pe-action-grid { display: grid; gap: 0.5rem; }
.pe-button-grid--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pe-button-grid--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.pe-button-grid button,
.pe-action-grid button,
.pe-controls > button,
.pe-diagnostics > button {
    min-width: 0;
    min-height: 44px;
    border: 1px solid rgba(117, 214, 226, 0.30);
    border-radius: 0;
    background: rgba(4, 14, 21, 0.72);
    color: #ddf4f5;
    cursor: pointer;
    font: inherit;
    font-size: 0.75rem;
    font-weight: 750;
    letter-spacing: 0.07em;
    padding: 0.55rem 0.45rem;
    text-align: center;
}

.pe-button-grid button:hover,
.pe-button-grid button:focus-visible,
.pe-action-grid button:hover,
.pe-action-grid button:focus-visible,
.pe-diagnostics > button:hover,
.pe-diagnostics > button:focus-visible,
.pe-button-grid button[aria-pressed="true"] {
    border-color: var(--pe-cyan);
    background: rgba(56, 145, 164, 0.24);
    color: #ffffff;
}

.pe-action-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pe-action-grid .primary-control { border-color: rgba(255, 220, 145, 0.62); color: var(--pe-amber); }
.pe-controls label { display: flex; justify-content: space-between; gap: 0.7rem; margin-top: 0.7rem; color: #d7edf0; font-size: 0.83rem; }
.pe-controls output { color: var(--pe-amber); font-variant-numeric: tabular-nums; }
.pe-controls input[type="range"] { display: block; width: 100%; min-height: 44px; margin: 0.1rem 0 0; accent-color: var(--pe-cyan); cursor: pointer; }
.pe-control-help { margin: 0.55rem 0 0; font-size: 0.76rem; }
.pe-download { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; color: var(--pe-cyan); font-size: 0.8rem; }
.pe-download[hidden] { display: none !important; }
.pe-shortcut-note p { margin: 0.5rem 0 0; font-size: 0.75rem; }
.pe-shortcut-note kbd { display: inline-block; min-width: 1.5em; padding: 0.1rem 0.25rem; border: 1px solid rgba(117, 214, 226, 0.35); color: #eaf7f8; text-align: center; }

.pe-readouts,
.pe-diagnostics { margin-top: 1rem; }
.pe-readout-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.55rem; }
.pe-readout-grid small { display: block; margin-top: 0.3rem; color: var(--pe-muted); font-size: 0.7rem; line-height: 1.4; }
.pe-validation-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 0.5rem; }
.pe-validation-grid strong { display: block; margin-top: 0.25rem; color: #f1fbfc; font-size: 0.75rem; overflow-wrap: anywhere; }
.pe-test-summary { margin: 0.8rem 0; color: var(--pe-cyan); }
.pe-diagnostics-body { max-height: 25rem; margin: 0.8rem 0 0; overflow: auto; border: 1px solid rgba(117, 214, 226, 0.18); background: rgba(2, 8, 13, 0.7); color: #d9eef1; font: 0.76rem/1.6 ui-monospace, SFMono-Regular, Consolas, monospace; padding: 0.8rem; white-space: pre-wrap; }
.pe-report-details { margin-top: 0.8rem; border-top: 1px solid rgba(117, 214, 226, 0.18); padding-top: 0.8rem; }
.pe-report-details summary { min-height: 44px; padding: 0.65rem 0; color: var(--pe-amber); cursor: pointer; }
.pe-report-details pre { max-height: 25rem; margin: 0.5rem 0 0; overflow: auto; border: 1px solid rgba(117, 214, 226, 0.18); background: rgba(2, 8, 13, 0.7); color: #d9eef1; font: 0.76rem/1.6 ui-monospace, SFMono-Regular, Consolas, monospace; padding: 0.8rem; white-space: pre-wrap; }

.pe-notes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.pe-notes h2 { font-size: clamp(1.05rem, 1.8vw, 1.35rem); }
.pe-notes p:not(.eyebrow),
.pe-notes ul { margin: 0; font-size: 0.88rem; }
.pe-notes ul { padding-left: 1.1rem; color: var(--pe-muted); line-height: 1.7; }
.pe-notes code,
.pe-formula code { color: var(--pe-amber); font: 0.88em ui-monospace, SFMono-Regular, Consolas, monospace; }

.pe-formula { margin-top: 1rem; }
.pe-equation { display: grid; gap: 0.35rem; margin: 0.9rem 0; padding: 0.8rem; border-left: 2px solid var(--pe-violet); background: rgba(7, 17, 28, 0.58); }
.pe-equation p { margin: 0; color: #e8f5f7; line-height: 1.6; overflow-wrap: anywhere; }
.pe-formula > p:last-child { margin-bottom: 0; font-size: 0.86rem; }

.pe-lower-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.pe-lower-grid > * { min-width: 0; }
.pe-related-list { display: grid; gap: 0.5rem; }
.pe-related-list a { display: grid; gap: 0.2rem; min-height: 44px; padding: 0.65rem 0.7rem; border: 1px solid rgba(117, 214, 226, 0.18); color: #edfafa; text-decoration: none; }
.pe-related-list a:hover,
.pe-related-list a:focus-visible { border-color: var(--pe-cyan); background: rgba(56, 145, 164, 0.18); }
.pe-related-list span { color: var(--pe-cyan); font-size: 0.63rem; letter-spacing: 0.08em; }
.pe-related-list strong { font-size: 0.84rem; font-weight: 600; }

@media (max-width: 940px) {
    .pe-layout { grid-template-columns: minmax(0, 1fr); }
    .pe-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
    .pe-controls-head,
    .pe-controls > .pe-action-grid,
    .pe-controls > .pe-download,
    .pe-controls > .pe-shortcut-note { grid-column: 1 / -1; }
    .pe-notes,
    .pe-lower-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pe-notes article:last-child,
    .pe-lower-grid > :last-child { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
    .pe-app { width: min(1380px, calc(100% - 20px)); }
    .pe-controls,
    .pe-notes,
    .pe-lower-grid { grid-template-columns: minmax(0, 1fr); }
    .pe-controls-head,
    .pe-controls > .pe-action-grid,
    .pe-controls > .pe-download,
    .pe-controls > .pe-shortcut-note,
    .pe-notes article:last-child,
    .pe-lower-grid > :last-child { grid-column: auto; }
    .pe-readout-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pe-validation-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
    .page-photoelastic-stress-observatory .lab-hero h1 { max-width: none; font-size: clamp(2rem, 11vw, 3rem); }
    .pe-stage,
    .pe-controls,
    .pe-readouts,
    .pe-diagnostics,
    .pe-notes article,
    .pe-formula,
    .pe-related { padding: 0.9rem; }
    .pe-canvas-frame { width: 100%; min-height: 0; aspect-ratio: 12 / 7; }
    .pe-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pe-readout-grid { grid-template-columns: minmax(0, 1fr); }
    .pe-validation-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pe-button-grid--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .pe-button-grid button,
    .pe-action-grid button { font-size: 0.68rem; }
}

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