.pid-title-row {
    margin-bottom: 24px;
}

.pid-workbench {
    display: grid;
    grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
    gap: 20px;
    align-items: start;
    margin-bottom: 40px;
}

.pid-controls,
.pid-results {
    min-width: 0;
}

.pid-controls {
    display: grid;
    gap: 14px;
}

.pid-panel,
.plot-panel,
.metrics-panel,
.metrics-fold,
.context-panel,
.export-panel,
.method-panel,
.learning-panel,
.narrative-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.pid-panel,
.plot-panel,
.context-panel,
.export-panel,
.method-panel,
.learning-panel,
.metrics-fold {
    padding: 16px;
}

.panel-header,
.plot-header,
.export-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.panel-header h2,
.plot-header h2,
.context-summary h2,
.export-panel h2 {
    margin: 0;
    font-size: 1rem;
}

/* Foldable details panels; visual parity with the old section-based panels */
details.foldable {
    overflow: hidden;
}

details.foldable > summary {
    cursor: pointer;
    list-style: none;
    user-select: none;
}

details.foldable > summary::-webkit-details-marker {
    display: none;
}

details.foldable[open] > summary {
    margin-bottom: 10px;
}

details.foldable > summary:focus-visible {
    outline: 2px solid var(--accent-engineering);
    outline-offset: 3px;
    border-radius: 6px;
}

.fold-indicator {
    color: var(--text-secondary);
    display: inline-block;
    font-family: "JetBrains Mono", monospace;
    font-size: 0.7rem;
    font-weight: 700;
    margin-left: auto;
    padding-left: 8px;
    transition: transform 0.15s ease;
}

.fold-indicator::before {
    content: "v";
}

details.foldable:not([open]) > summary .fold-indicator::before {
    content: ">";
}

details.foldable:not([open]) > summary {
    margin: 0;
}

/* The Methods and Learning panels are details elements without our standard
   panel-header markup. Style their built-in summary to match. */
.method-panel > summary,
.learning-panel > summary {
    align-items: center;
    display: flex;
    justify-content: space-between;
}

.method-panel > summary::after,
.learning-panel > summary::after {
    color: var(--text-secondary);
    content: "v";
    font-family: "JetBrains Mono", monospace;
    font-size: 0.7rem;
    font-weight: 700;
    margin-left: 8px;
}

.method-panel:not([open]) > summary::after,
.learning-panel:not([open]) > summary::after {
    content: ">";
}

.workbench-toolbar {
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    grid-column: 1 / -1;
    margin-bottom: 4px;
    padding: 8px 12px;
}

.workbench-toolbar .action-btn {
    font-size: 0.78rem;
    min-height: 28px;
    padding: 4px 10px;
}

.workbench-toolbar-hint {
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-style: italic;
    margin-left: auto;
}

.context-summary {
    align-items: center;
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.context-body {
    display: grid;
    gap: 12px;
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr);
    align-items: start;
}

.context-body p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    max-width: 780px;
}

.export-body {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
}

.export-body p {
    color: var(--text-secondary);
    font-size: 0.82rem;
    margin: 0;
}

.metrics-fold[open] > .metrics-panel {
    margin-top: 4px;
}

.term {
    border-bottom: 1px dotted var(--accent-engineering);
    cursor: help;
    position: relative;
    text-decoration: none;
    text-underline-offset: 3px;
}

.term:focus-visible {
    border-radius: 4px;
    outline: 2px solid var(--accent-engineering);
    outline-offset: 3px;
}

.term[data-help]::after {
    background: var(--bg-secondary);
    border: 1px solid var(--border-hover);
    border-radius: 6px;
    box-shadow: var(--shadow-sm);
    color: var(--text-primary);
    content: attr(data-help);
    font-family: "Space Grotesk", sans-serif;
    font-size: 0.78rem;
    font-weight: 500;
    left: 0;
    line-height: 1.35;
    max-width: min(300px, 80vw);
    min-width: 220px;
    opacity: 0;
    padding: 9px 10px;
    pointer-events: none;
    position: absolute;
    text-transform: none;
    top: calc(100% + 8px);
    transform: translateY(-4px);
    transition: opacity 0.12s ease, transform 0.12s ease;
    white-space: normal;
    z-index: 20;
}

.term[data-help]:hover::after,
.term[data-help]:focus::after {
    opacity: 1;
    transform: translateY(0);
}

.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 12px;
}

.preset-btn,
.action-btn {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-family: "Space Grotesk", sans-serif;
    font-size: 0.82rem;
    font-weight: 600;
    line-height: 1.2;
    min-height: 34px;
    padding: 8px 10px;
    transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.preset-btn:hover,
.action-btn:hover {
    border-color: var(--accent-engineering);
    background: var(--accent-engineering-dim);
}

.preset-btn.recommended {
    border-color: var(--accent-success);
    background: var(--accent-success-dim);
    color: var(--text-primary);
    position: relative;
}

.preset-btn.recommended::after {
    background: var(--accent-success);
    border-radius: 999px;
    color: var(--bg-primary);
    content: "rec";
    font-family: "JetBrains Mono", monospace;
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    padding: 2px 6px;
    position: absolute;
    right: 6px;
    text-transform: uppercase;
    top: 6px;
}

.preset-btn.recommended-primary {
    box-shadow: 0 0 0 2px var(--accent-success);
}

.preset-btn.recommended-primary::after {
    content: "auto";
}

.control-grid {
    display: grid;
    gap: 12px;
    margin-top: 12px;
}

.control-field {
    display: grid;
    grid-template-columns: minmax(105px, 1fr) minmax(120px, 1.4fr) 82px;
    gap: 8px;
    align-items: center;
}

.control-field.compact {
    grid-template-columns: minmax(130px, 1fr) 110px;
}

.control-field span,
.toggle-row span {
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 600;
}

.control-field input[type="number"] {
    width: 100%;
}

.control-field input[type="range"] {
    width: 100%;
    accent-color: var(--accent-engineering);
}

.control-field input[type="number"],
.control-field input[type="text"],
.control-field select {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.8rem;
    min-height: 34px;
    padding: 6px 8px;
}

.gain-readout {
    color: var(--text-secondary);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.72rem;
    font-weight: 600;
    grid-column: 1 / -1;
    margin-top: -4px;
    min-height: 14px;
    opacity: 0.85;
}

.panel-note {
    color: var(--text-secondary);
    font-size: 0.78rem;
    line-height: 1.4;
    margin: 8px 0 0;
}

.control-field input:focus,
.toggle-row input:focus-visible,
.preset-btn:focus-visible,
.action-btn:focus-visible {
    outline: 2px solid var(--accent-engineering);
    outline-offset: 2px;
}

.toggle-row {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 34px;
}

.toggle-row input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-engineering);
}

.pid-results {
    display: grid;
    gap: 16px;
}

.context-panel {
    align-items: flex-start;
}

.loop-map {
    display: grid;
    gap: 8px;
    grid-template-columns: repeat(2, minmax(160px, 1fr));
    min-width: 360px;
}

.loop-map div {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 10px;
}

.loop-map span {
    color: var(--accent-engineering);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
}

.loop-map strong {
    color: var(--text-primary);
    display: block;
    font-size: 0.82rem;
    margin-top: 2px;
}

.status-banner {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 600;
    min-height: 42px;
    padding: 10px 12px;
}

.status-banner.ready {
    border-color: var(--accent-success);
    background: var(--accent-success-dim);
    color: var(--text-primary);
}

.status-banner.loading {
    border-color: var(--accent-warning);
    background: var(--accent-warning-dim);
    color: var(--text-primary);
}

.status-banner.error {
    border-color: var(--accent-error);
    background: var(--accent-error-dim);
    color: var(--text-primary);
}

.status-banner.warning {
    border-color: var(--accent-warning);
    background: var(--accent-warning-dim);
    color: var(--text-primary);
}

.tuning-readout {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.78rem;
    padding: 8px 12px;
}

.tuning-readout.error {
    border-color: var(--accent-error);
    background: var(--accent-error-dim);
    color: var(--text-primary);
}

.regime-banner {
    align-items: stretch;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    display: grid;
    gap: 0;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    overflow: hidden;
}

.regime-cell {
    border-right: 1px solid var(--border-color);
    padding: 10px 14px;
}

.regime-cell:last-child {
    border-right: 0;
}

.regime-label {
    color: var(--text-secondary);
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.regime-cell strong {
    color: var(--text-primary);
    display: block;
    font-family: "JetBrains Mono", monospace;
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 4px;
}

.narrative-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    padding: 16px;
}

.narrative-header {
    align-items: baseline;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    padding-bottom: 10px;
}

.narrative-header h2 {
    font-size: 1rem;
    margin: 0;
}

.narrative-subtitle {
    color: var(--accent-engineering);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.85rem;
    font-weight: 700;
}

.narrative-grid {
    display: grid;
    gap: 10px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin: 12px 0 0;
}

.narrative-grid > div {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px 12px;
}

.narrative-grid dt {
    color: var(--text-secondary);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.narrative-grid dd {
    color: var(--text-primary);
    font-size: 0.85rem;
    line-height: 1.4;
    margin: 6px 0 0;
}

.reading-chip {
    background: var(--accent-engineering-dim);
    border: 1px solid var(--accent-engineering);
    border-radius: 999px;
    color: var(--accent-engineering);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: "JetBrains Mono", monospace;
    font-size: 0.7rem;
    font-weight: 800;
    height: 18px;
    margin-right: 8px;
    min-width: 18px;
    padding: 0 5px;
    vertical-align: 1px;
}

.section-heading {
    color: var(--text-primary);
    font-size: 1rem;
    margin: 4px 0 -4px;
}

.section-hint {
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-style: italic;
    font-weight: 500;
    margin-left: 6px;
}

.clean-slate-panel {
    border-color: var(--accent-engineering);
    background: var(--accent-engineering-dim);
}

.clean-slate-panel h2 {
    color: var(--text-primary);
}

.clean-slate-panel .panel-note {
    color: var(--text-primary);
    font-size: 0.82rem;
}

.panel-tag {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--text-secondary);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    margin-left: 8px;
    padding: 2px 8px;
    text-transform: uppercase;
    vertical-align: 1px;
}

.layer-panel-marker {
    background: var(--bg-secondary);
    border-style: dashed;
}

.layer-panel-marker h2 {
    color: var(--text-secondary);
}

.layer-panel-marker .panel-note {
    font-size: 0.82rem;
}

.entry-chip {
    background: var(--accent-engineering);
    border-radius: 999px;
    color: var(--bg-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: "JetBrains Mono", monospace;
    font-size: 0.72rem;
    font-weight: 800;
    height: 20px;
    margin-right: 8px;
    min-width: 20px;
    vertical-align: 1px;
}

.exercise-panel .panel-header {
    align-items: center;
}

.exercise-toggle {
    display: none;
}

.exercise-active {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin-top: 10px;
    padding: 10px 12px;
}

.exercise-step-header {
    align-items: baseline;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: space-between;
}

.exercise-step-index {
    color: var(--accent-engineering);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.74rem;
    font-weight: 800;
}

.exercise-step-title {
    color: var(--text-primary);
    font-size: 0.88rem;
    font-weight: 700;
}

.exercise-step-detail {
    color: var(--text-secondary);
    font-size: 0.82rem;
    line-height: 1.4;
    margin: 6px 0 0;
}

.exercise-step-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
}

.exercise-step-controls .action-btn {
    padding: 6px 10px;
    font-size: 0.78rem;
    min-height: 30px;
}

.exercise-conclusion {
    background: var(--accent-success-dim);
    border: 1px solid var(--accent-success);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.82rem;
    line-height: 1.4;
    margin-top: 10px;
    padding: 8px 10px;
}

.exercise-apply-btn {
    background: var(--accent-engineering-dim);
    border-color: var(--accent-engineering);
    color: var(--text-primary);
}

.exercise-apply-hint {
    color: var(--text-secondary);
    font-size: 0.74rem;
    font-style: italic;
    line-height: 1.4;
    margin-top: 8px;
}

.reset-row {
    align-items: center;
    border-top: 1px dashed var(--border-color);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 12px;
    padding-top: 10px;
}

.reset-tuning-btn {
    background: var(--accent-engineering-dim);
    border-color: var(--accent-engineering);
    color: var(--text-primary);
}

.reset-row-hint {
    color: var(--text-secondary);
    flex: 1 1 200px;
    font-size: 0.74rem;
    font-style: italic;
    min-width: 200px;
}

.glossary-panel {
    background: var(--bg-card);
    border-left: 1px solid var(--border-color);
    bottom: 0;
    box-shadow: -16px 0 32px rgba(0, 0, 0, 0.25);
    color: var(--text-primary);
    max-width: 360px;
    overflow-y: auto;
    padding: 16px 18px;
    position: fixed;
    right: 0;
    top: 0;
    transform: translateX(100%);
    transition: transform 0.18s ease;
    width: 90vw;
    z-index: 40;
}

.glossary-panel.is-open {
    transform: translateX(0);
}

.glossary-header {
    align-items: baseline;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    padding-bottom: 8px;
}

.glossary-header h2 {
    font-size: 1rem;
    margin: 0;
}

.glossary-close {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 700;
    height: 28px;
    width: 28px;
}

.glossary-body {
    color: var(--text-primary);
    font-size: 0.86rem;
    line-height: 1.5;
    margin: 14px 0 0;
}

.glossary-hint {
    color: var(--text-secondary);
    font-size: 0.74rem;
    font-style: italic;
    margin: 16px 0 0;
}

.metrics-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    overflow: hidden;
}

.metric-tile {
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    min-height: 76px;
    padding: 12px;
}

.metric-tile span {
    color: var(--text-secondary);
    display: block;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
}

.metric-tile strong {
    color: var(--text-primary);
    display: block;
    font-family: "JetBrains Mono", monospace;
    font-size: clamp(1rem, 1.7vw, 1.28rem);
    font-weight: 700;
    margin-top: 8px;
    min-width: 0;
    overflow-wrap: anywhere;
}

.metric-tile-frequency {
    background: rgba(244, 114, 182, 0.08);
}

.metric-tile-frequency span {
    color: var(--accent-engineering);
}

.plot-panel {
    min-height: 330px;
}

.plot-header {
    margin-bottom: 10px;
}

.legend-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.legend-item {
    align-items: center;
    color: var(--text-secondary);
    display: inline-flex;
    font-size: 0.75rem;
    font-weight: 700;
    gap: 6px;
}

.legend-item::before {
    border-radius: 999px;
    content: "";
    display: inline-block;
    height: 8px;
    width: 18px;
}

.legend-item.setpoint::before {
    background: #f59e0b;
}

.legend-item.pv::before {
    background: #38bdf8;
}

.legend-item.measurement::before {
    background: #a78bfa;
}

.legend-item.output::before {
    background: #22c55e;
}

.legend-item.raw::before {
    background: #ef4444;
}

.legend-item.disturbance::before {
    background: #94a3b8;
}

.legend-item.sensitivity::before {
    background: #f472b6;
}

.legend-item.crossover::before {
    background: #facc15;
}

.legend-item.annotation::before {
    background: #5eead4;
}

canvas {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    display: block;
    height: 300px;
    width: 100%;
}

#pvChart {
    height: 360px;
}

#bodeMagnitudeChart,
#bodePhaseChart {
    height: 240px;
}

#bodePhaseChart {
    margin-top: 10px;
}

.export-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.method-panel summary,
.learning-panel summary {
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
}

.method-panel[open] summary,
.learning-panel[open] summary {
    margin-bottom: 14px;
}

.method-content {
    display: grid;
    gap: 16px;
}

.method-content section + section {
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

.method-content h3 {
    color: var(--text-primary);
    font-size: 0.95rem;
    margin: 0 0 8px;
}

.method-panel p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.55;
    margin: 8px 0 0;
}

.method-panel pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.78rem;
    line-height: 1.45;
    margin: 10px 0 0;
    overflow-x: auto;
    padding: 10px 12px;
}

.method-panel code {
    font-family: "JetBrains Mono", monospace;
}

.method-list {
    color: var(--text-secondary);
    display: grid;
    font-size: 0.9rem;
    gap: 8px;
    line-height: 1.45;
    margin: 10px 0 0;
    padding-left: 20px;
}

.reference-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 14px;
}

.reference-grid article {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px;
}

.reference-grid h3 {
    font-size: 0.92rem;
    margin: 0 0 6px;
}

.reference-grid p {
    color: var(--text-secondary);
    font-size: 0.84rem;
    margin-top: 6px;
}

.reference-grid a {
    color: var(--accent-engineering);
    font-weight: 700;
    overflow-wrap: anywhere;
}

@media (max-width: 1080px) {
    .pid-workbench {
        grid-template-columns: 1fr;
    }

    .pid-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

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

    .control-field,
    .control-field.compact {
        grid-template-columns: 1fr;
    }

    .metrics-panel {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }

    .panel-header,
    .plot-header,
    .context-panel,
    .export-panel {
        align-items: flex-start;
        flex-direction: column;
    }

    .loop-map {
        min-width: 0;
        width: 100%;
    }

    .narrative-grid {
        grid-template-columns: 1fr;
    }

    .regime-banner {
        grid-template-columns: 1fr;
    }

    .regime-cell {
        border-right: 0;
        border-bottom: 1px solid var(--border-color);
    }

    .regime-cell:last-child {
        border-bottom: 0;
    }
}

@media (max-width: 520px) {
    .preset-grid,
    .metrics-panel {
        grid-template-columns: 1fr;
    }

    .metric-tile {
        border-right: 0;
        border-bottom: 1px solid var(--border-color);
    }

    .metric-tile:last-child {
        border-bottom: 0;
    }

    .loop-map {
        grid-template-columns: 1fr;
    }

    .reference-grid {
        grid-template-columns: 1fr;
    }

    .term[data-help]::after {
        min-width: 190px;
    }
}