/* Compact desktop workspaces. Narrow/short windows deliberately reflow instead
   of clipping controls or shrinking text below a usable size. */
.workspace-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.workspace-tabs button { min-height: 38px; padding: 8px 15px; border: 1px solid #b6cfd9; border-radius: 8px; color: #254c60; background: #fff; font-size: .86rem; font-weight: 800; }
.workspace-tabs [aria-selected="true"] { color: #fff; background: #0c496f; border-color: #0c496f; }
.workspace-panel.hidden { display: none !important; }
.workspace-panel { min-width: 0; }
#objectSelect { display: block; width: 100%; min-height: 38px; padding: 7px; border: 1px solid #b6cfd9; border-radius: 8px; color: #173e51; background: #fff; font-size: .85rem; }
.mass-partner-hint { margin: 8px 0 0; color: #27635d; font-size: .75rem; line-height: 1.4; }
.constants-details, .plan-details { margin: 9px 0; color: #375666; font-size: .78rem; }
.constants-details summary, .plan-details summary { cursor: pointer; font-weight: 750; }
.plan-details .plan-summary { margin-top: 8px; }
/* Fixed settings live in the collapsed summary, not duplicate disabled inputs. */
#objectLockReason, #heightLockReason, #launchLockReason, #boosterLockReason { display: none; }
.after-trial label { margin-top: 0; }

@media (min-width: 1000px) and (min-height: 640px) {
  .app-shell { height: 100dvh; min-height: 0; padding: 9px 14px; display: flex; flex-direction: column; gap: 7px; }
  .topbar { flex-shrink: 0; min-height: 36px; margin: 0; gap: 12px; }
  .brand { gap: 8px; }
  .brand-mark { width: 34px; height: 34px; border-radius: 10px; font-size: 25px; }
  h1 { font-size: 1.18rem; }
  .header-actions { flex-wrap: nowrap; gap: 6px; }
  .header-actions .button { padding: 7px 10px; font-size: .75rem; }
  .save-status { max-width: 300px; font-size: .68rem; padding: 3px 5px; }
  main { flex: 1; min-height: 0; display: flex; flex-direction: column; gap: 7px; }
  .mission-card { flex-shrink: 0; margin: 0; padding: 5px 11px; border-left-width: 4px; border-radius: 9px; }
  .mission-card h2 { font-size: .94rem; }
  .formula-strip span { font-size: .72rem; padding: 4px 7px; }
  .workspace-tabs { flex-shrink: 0; margin: 0; gap: 5px; }
  .workspace-tabs button { min-height: 31px; padding: 5px 12px; font-size: .79rem; }
  .workspace-panel { flex: 1; min-height: 0; }
  .lab-workspace { display: flex; flex-direction: column; gap: 7px; }
  .lab-setup { display: flex; align-items: stretch; gap: 8px; flex-shrink: 0; }
  .lab-switcher { width: 44%; flex-shrink: 0; margin: 0; gap: 7px; }
  .lab-switcher button { padding: 8px 10px; border-radius: 9px; }
  .lab-switcher button[aria-pressed="true"] { padding: 7px 9px; }
  .lab-switcher strong { font-size: .85rem; margin-bottom: 3px; }
  .lab-switcher span { font-size: .69rem; line-height: 1.35; }
  .investigation-panel { flex: 1; display: flex; align-items: stretch; gap: 7px; min-width: 0; padding: 7px; margin: 0; border-radius: 9px; }
  .mode-tiles { flex: 1; min-width: 0; gap: 6px; }
  .mode-tile { min-height: 42px; padding: 7px; gap: 4px; font-size: .81rem; border-radius: 7px; }
  .mode-tile::after { width: 12px; }
  .topic-tiles { margin: 0; padding: 0 0 0 7px; border-top: 0; border-left: 1px solid #dbe6eb; }
  .trial-workflow { flex-shrink: 0; margin: 0; padding: 6px 10px; border-radius: 9px; }
  .trial-steps { gap: 8px 20px; }
  .trial-steps li { font-size: .73rem; gap: 6px; }
  .trial-steps li > span { width: 22px; height: 22px; }
  .workflow-next { margin-top: 4px; gap: 10px; }
  .workflow-next p { font-size: .71rem; line-height: 1.3; }
  .workflow-next .button { padding: 4px 8px; font-size: .68rem; }
  .lab-grid { flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(205px, .65fr) minmax(0, 1.75fr) minmax(225px, .72fr); gap: 9px; align-items: stretch; }
  .control-panel, .results-panel { padding: 11px; min-height: 0; overflow: auto; }
  .results-panel { grid-column: auto; display: flex; flex-direction: column; }
  .control-panel h2, .results-panel h2, .scene-heading h2 { font-size: 1rem; margin: 0; }
  .control-panel > .panel-heading, .results-panel > .panel-heading { margin-bottom: 8px; }
  #activeRunLabel { font-size: .72rem; margin: 6px 0; }
  #activeRunSelect { min-height: 31px; margin-top: 3px; font-size: .74rem; padding: 5px; }
  .constants-details, .plan-details { font-size: .72rem; margin: 6px 0; }
  .constants-note { font-size: .71rem; line-height: 1.35; }
  .plan-panel { margin: 6px 0; padding: 9px; }
  .plan-panel h3 { font-size: .85rem; margin: 0 0 6px; }
  .plan-panel label { margin: 6px 0 4px; font-size: .73rem; }
  .plan-panel input[type="number"], .plan-panel select { min-height: 30px; padding: 5px; margin-top: 3px; font-size: .8rem; }
  .plan-panel .button { font-size: .74rem; margin-top: 8px; padding: 8px; }
  fieldset { padding: 8px 0; }
  legend { margin-bottom: 5px; font-size: .76rem; }
  label { font-size: .75rem; margin: 6px 0 4px; }
  #objectSelect { min-height: 33px; font-size: .76rem; }
  .mass-partner-hint { margin-top: 5px; font-size: .69rem; }
  .booster-grid { gap: 5px; }
  .booster-card { padding: 6px 3px; }
  .booster-card strong { font-size: .72rem; }
  .booster-card small { font-size: .8rem; margin-top: 2px; }
  #cartMassSummary { margin: 6px 0 0; }
  #fixedEnvironmentNote, #fallTip { display: none; }
  .suggested-settings { gap: 4px; margin-bottom: 8px; }
  .suggested-settings button { font-size: .7rem; padding: 5px 3px; }
  .run-button { padding: 9px; font-size: .8rem; }
  .run-prompt, .run-prompt.needs-recording { min-height: 0; font-size: .71rem; margin-top: 7px; line-height: 1.35; }
  .run-prompt.needs-recording { padding: 7px; }
  .scene-panel { display: flex; flex-direction: column; gap: 5px; min-height: 0; padding: 10px; }
  .scene-heading { flex-shrink: 0; padding: 0; gap: 8px; }
  .toggle-label { font-size: .68rem; }
  .scene-toolbar { flex-shrink: 0; padding: 0; gap: 8px; }
  .scene-toolbar strong { font-size: .78rem; }
  .scene-toolbar span { font-size: .68rem; margin-top: 2px; }
  .camera-status #scenePhase { font-size: .65rem; padding: 3px 5px; margin-bottom: 2px; }
  .camera-status small { font-size: .63rem; }
  .scene-viewport { flex: 1; min-height: 0; container-type: size; display: grid; place-items: center; }
  .scene-viewport .canvas-wrap { width: min(100cqw, 150cqh); aspect-ratio: 3 / 2; margin: 0; border-radius: 9px; }
  #sceneCanvas { width: 100%; height: auto; }
  .height-ruler-label { font-size: .65rem; padding: 2px 4px; }
  .force-callout { width: 30%; padding: 4px 5px; border-left-width: 2px; border-radius: 5px; }
  .force-callout span { font-size: .6rem; }
  .force-callout strong { font-size: .8rem; margin: 2px 0; }
  .force-callout small { display: none; }
  .energy-panel { flex-shrink: 0; margin: 0; padding: 7px 9px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  .energy-heading { display: none; }
  .energy-row + .energy-row { margin: 0; }
  .energy-row > div { align-items: flex-start; gap: 5px; }
  .energy-row label { font-size: .65rem; line-height: 1.3; }
  .energy-row output { font-size: .67rem; }
  .energy-row progress { height: 7px; }
  .scene-caption, .force-snapshot-note { display: none; }
  .playback-controls { flex-shrink: 0; gap: 6px; padding: 0; }
  .playback-controls button { font-size: .7rem; padding: 5px 8px; }
  .results-panel .readings { flex-shrink: 0; grid-template-columns: 1fr 1fr; gap: 6px; }
  .reading { min-height: 63px; padding: 7px; border-radius: 8px; }
  .reading p { font-size: .65rem; margin-bottom: 5px; }
  .reading strong { font-size: 1.12rem; }
  .reading span { font-size: .62rem; }
  .after-trial { flex: 1; min-height: 175px; display: flex; flex-direction: column; gap: 6px; margin-top: 9px; padding: 8px; }
  .after-trial label { margin: 0; font-size: .75rem; }
  .after-trial textarea { flex: 1; min-height: 50px; width: 100%; resize: none; margin: 0; padding: 7px; font-size: .8rem; }
  .after-trial .button { margin: 0; font-size: .74rem; padding: 7px; }
  #recordHint { margin: 0; font-size: .67rem; line-height: 1.3; }
  #observationFeedback { margin: 0; font-size: .7rem; }
  .notebook-grid { margin: 0; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 10px; }
  .data-panel, .graph-panel { min-height: 0; padding: 14px; overflow: auto; }
  .data-panel { display: flex; flex-direction: column; }
  .table-wrap { flex: 1; min-height: 0; max-height: none; }
  .cer-panel { margin: 0; padding: 16px; display: flex; flex-direction: column; overflow: auto; }
  .cer-grid { flex: 1; min-height: 0; margin-top: 10px; }
  .cer-grid label { display: flex; flex-direction: column; min-height: 0; }
  .cer-grid textarea { flex: 1; min-height: 150px; resize: none; }
  .teacher-notes { margin: 0; overflow: auto; }
  .build-note { flex-shrink: 0; margin: 0; font-size: .64rem; }
}
@media (min-width: 1000px) and (min-height: 640px) and (max-height: 780px) {
  .mission-card { display: none; }
}
@media print {
  .workspace-tabs, .lab-workspace, #teacherWorkspace, .build-note { display: none !important; }
  #dataWorkspace, #cerWorkspace { display: block !important; }
  .app-shell, main { height: auto; display: block; }
}

/* Build 12: simulation-first layout. The stage receives the available space;
   switching labs and modes is intentionally kept on a separate menu screen. */
.visually-hidden { 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; }
.simulation-menu { width: min(820px, 100%); margin: auto; padding: clamp(20px, 3vw, 34px); }
.simulation-menu-heading { text-align: center; margin-bottom: clamp(18px, 3vw, 30px); }
.simulation-menu-heading h2 { margin: 0; font-size: clamp(1.35rem, 3vw, 2rem); }
.simulation-menu .lab-switcher { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; margin: 0 0 16px; gap: 14px; }
.simulation-menu .lab-switcher button { position: relative; display: grid; grid-template-rows: clamp(118px, 15vw, 148px) auto; min-height: 0; padding: 0; overflow: hidden; border: 1px solid #b9d4dd; border-radius: 14px; color: #173e51; background: #fff; text-align: left; box-shadow: 0 2px 0 #dcecf0; transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease; }
.simulation-menu .lab-switcher button[aria-pressed="true"] { padding: 0; border: 2px solid #137d89; background: #fff; box-shadow: 0 8px 18px #167e8b24; }
.simulation-menu .lab-switcher button:hover:not(:disabled) { transform: translateY(-3px); border-color: #3d95a2; box-shadow: 0 10px 20px #17334a1c; }
.simulation-menu .lab-switcher button:focus-visible { z-index: 1; outline: 3px solid #ffce61; outline-offset: 3px; }
.simulation-menu .lab-switcher button[aria-pressed="true"]::after { content: 'Selected'; position: absolute; z-index: 1; top: 10px; right: 10px; padding: 4px 7px; border-radius: 999px; color: #075c65; background: #effbf8e8; box-shadow: 0 1px 4px #17476224; font-size: .65rem; font-weight: 850; letter-spacing: .04em; text-transform: uppercase; }
.simulation-tile-art { display: block; min-height: 0; overflow: hidden; border-bottom: 1px solid #d8eaef; background: linear-gradient(180deg, #dff5fb 0%, #a8deee 100%); }
.simulation-tile-art img { display: block; width: 100%; height: 100%; object-fit: cover; }
.tower-tile-art img { object-position: center 48%; }
.cart-tile-art { background: #eff4ed; }
.cart-tile-art img { object-position: center 70%; }
.simulation-tile-copy { display: block; padding: 13px 15px 15px; background: linear-gradient(180deg, #fff, #fbfdfe); }
.simulation-tile-copy strong { display: block; margin: 0 0 4px; color: #143e58; font-size: 1rem; line-height: 1.15; }
.simulation-tile-copy > span { display: block; color: #4b6877; font-size: .77rem; line-height: 1.38; }
.simulation-menu .investigation-panel { padding: 0; margin: 0; }
.simulation-menu .topic-tiles { margin-top: 10px; padding-top: 10px; }
.simulation-stage { min-width: 0; }
.scene-gauges { position: absolute; z-index: 3; top: 10px; right: 10px; display: grid; grid-template-columns: repeat(3, minmax(78px, 1fr)); gap: 6px; width: min(55%, 400px); }
.scene-gauges:has(#accelerationCard:not(.hidden)) { grid-template-columns: repeat(2, minmax(92px, 1fr)); width: min(42%, 290px); }
.scene-gauges .reading.gauge { position: relative; min-height: 60px; padding: 7px 8px 7px 12px; overflow: hidden; border: 1px solid #ffffffa8; border-radius: 10px; box-shadow: 0 2px 9px #17334a26; background: #ffffffdf; backdrop-filter: blur(5px); }
.scene-gauges .reading.gauge::before { content: ''; position: absolute; left: 0; top: 10px; bottom: 10px; width: 4px; border-radius: 0 5px 5px 0; background: #2578b9; }
.scene-gauges .reading.gauge.amber::before { background: #d8911e; }
.scene-gauges .reading.gauge.coral::before { background: #d55f4c; }
.scene-gauges .reading.gauge.teal::before { background: #158980; }
.scene-gauges .reading p { margin: 0 0 3px; font-size: clamp(.56rem, .78vw, .67rem); }
.scene-gauges .reading strong { font-size: clamp(.94rem, 1.55vw, 1.25rem); }
.scene-gauges .reading span { font-size: clamp(.55rem, .7vw, .64rem); }
.recording-resting-state { margin: 0; color: #486574; font-size: .78rem; line-height: 1.45; }
#afterTrial:not(.hidden) + .recording-resting-state { display: none; }

/* An accessible, image-rich object dropdown. The native select is retained as
   the programmatic form control; this visible picker gives each object art and
   enough room to scroll through the full library. */
.object-picker { position: relative; }
.object-picker summary { display: flex; align-items: center; gap: 9px; min-height: 54px; padding: 7px 9px; cursor: pointer; list-style: none; border: 1px solid #9cc6d0; border-radius: 10px; color: #173e51; background: #fafeff; }
.object-picker summary::-webkit-details-marker { display: none; }
.object-picker summary strong, .object-picker summary small { display: block; }
.object-picker summary strong { font-size: .79rem; }
.object-picker summary small { margin-top: 2px; color: #567080; font-size: .69rem; }
.object-picker-icon, .object-option > img, .object-option > .empty-cart-icon { display: grid; width: 36px; height: 36px; flex: 0 0 36px; place-items: center; overflow: hidden; border-radius: 9px; color: #26657a; background: #e7f5f6; object-fit: contain; }
.object-picker-icon img { width: 100%; height: 100%; object-fit: contain; }
.object-picker-caret { margin-left: auto; color: #1b6474; font-size: 1.25rem; line-height: 1; transition: transform .16s ease; }
.object-picker-caret::before { content: '⌄'; }
.object-picker[open] .object-picker-caret { transform: rotate(180deg); }
.object-picker-list { position: absolute; z-index: 20; top: calc(100% + 5px); right: 0; left: 0; max-height: min(360px, 50dvh); padding: 6px; overflow-y: auto; overscroll-behavior: contain; border: 1px solid #83b8c3; border-radius: 10px; box-shadow: 0 15px 30px #17334a31; background: #fff; }
.object-picker:not([open]) .object-picker-list { display: none; }
.object-picker-group + .object-picker-group { margin-top: 7px; padding-top: 7px; border-top: 1px solid #e0ebee; }
.object-picker-group > p { margin: 2px 5px 4px; color: #2f6470; font-size: .64rem; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; }
.object-option { display: flex; align-items: center; width: 100%; gap: 9px; padding: 6px; border: 1px solid transparent; border-radius: 8px; color: #173e51; background: #fff; text-align: left; }
.object-option:hover, .object-option:focus-visible { border-color: #8dc4d0; background: #effafb; outline: none; }
.object-option[aria-selected="true"] { border-color: #2c8092; background: #e2f4f6; }
.object-option > img, .object-option > .empty-cart-icon { width: 30px; height: 30px; flex-basis: 30px; border-radius: 7px; }
.object-option strong, .object-option small { display: block; }
.object-option strong { font-size: .76rem; }
.object-option small { margin-top: 1px; color: #54717e; font-size: .66rem; }
.object-picker[data-locked="true"] { pointer-events: none; opacity: .7; }

@media (min-width: 1000px) and (min-height: 640px) {
  .simulation-menu { align-self: center; }
  .lab-workspace { position: relative; }
  .simulation-stage { flex: 1; min-height: 0; display: flex; }
  .simulation-stage .lab-grid { flex: 1; min-height: 0; grid-template-columns: minmax(215px, .53fr) minmax(0, 2.5fr) minmax(190px, .46fr); gap: 8px; align-items: stretch; }
  .simulation-stage .lab-grid:has(.after-trial.hidden) { grid-template-columns: minmax(215px, .53fr) minmax(0, 3.15fr); }
  .simulation-stage .results-panel:has(.after-trial.hidden) { display: none; }
  .simulation-stage .control-panel, .simulation-stage .results-panel { padding: 10px; }
  .simulation-stage .control-panel { overflow: auto; }
  .simulation-stage .results-panel { display: flex; min-height: 0; overflow: auto; }
  .simulation-stage .after-trial { display: flex; flex: 1; min-height: 0; margin: 0; }
  .simulation-stage .scene-panel { min-height: 0; padding: 8px; }
  .simulation-stage .scene-heading { padding: 0 2px; }
  .simulation-stage .scene-toolbar { padding: 0 2px 3px; }
  .simulation-stage .scene-viewport { flex: 1; min-height: 0; }
  .simulation-stage .scene-viewport .canvas-wrap { width: min(100cqw, 150cqh); }
  .simulation-stage .energy-panel { margin: 0; }
  .simulation-stage .playback-controls { padding: 0; }
  .trial-workflow { margin: 0; }
}

@media (max-width: 999px), (max-height: 639px) {
  .simulation-stage .lab-grid { grid-template-columns: minmax(220px, 285px) minmax(0, 1fr); }
  .simulation-stage .results-panel { grid-column: 1 / -1; }
  .scene-gauges { width: min(62%, 390px); }
}

@media (max-width: 720px) {
  .simulation-menu { padding: 20px 14px; }
  .simulation-menu .lab-switcher { grid-template-columns: 1fr; }
  .simulation-menu .lab-switcher button { min-height: 118px; }
  .simulation-stage .lab-grid { grid-template-columns: 1fr; }
  .simulation-stage .results-panel { grid-column: auto; }
  .scene-gauges { top: 7px; right: 7px; width: min(73%, 340px); gap: 4px; }
  .scene-gauges .reading.gauge { min-height: 52px; padding: 5px 6px 5px 10px; }
}