/* css/pages/physics-intro.css */
.physics-page {
  --lab-bar-height: 76px;
  --lab-line: rgba(var(--text-secondary-rgb), .25);
  --lab-paper: #fff;
  --lab-soft: #f6f8fb;
  --lab-input: #fff;
  --lab-danger: #b02d2d;
  color-scheme: light;
}
[data-theme=dark] .physics-page {
  --lab-paper: #242435;
  --lab-soft: #29293d;
  --lab-input: #1e1e2e;
  --lab-danger: #ffb1b1;
  color-scheme: dark;
}
.lab-pagebar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  background: var(--bg-color);
  border-bottom: 1px solid var(--lab-line);
}
.lab-pagebar-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  max-width: 1200px;
  height: var(--lab-bar-height);
  margin: auto;
  padding: 12px 24px;
}
.lab-pagebar .back-button {
  justify-self: start;
  white-space: nowrap;
}
.lab-pagebar .theme-toggle {
  position: relative;
  inset: auto;
  justify-self: end;
  margin: 0;
  z-index: auto;
}
.lab-workspace {
  max-width: 1200px;
  margin: auto;
  padding: calc(var(--lab-bar-height) + 32px) 24px 60px;
}
.lab-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 26px;
}
.lab-header h1 {
  font-size: clamp(1.7rem, 3vw, 2.25rem);
  line-height: 1.4;
  margin: 0 0 8px;
}
.lab-total {
  flex-shrink: 0;
  border-left: 1px solid var(--lab-line);
  padding-left: 28px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: var(--text-secondary);
  font-size: .75rem;
}
.lab-total strong {
  font-size: 1.9rem;
  font-weight: 600;
  color: var(--accent-color);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}
.lab-total strong span {
  font-size: .9rem;
  font-weight: 400;
  color: var(--text-secondary);
}
.lab-toolbar {
  border: 1px solid var(--lab-line);
  border-radius: 10px;
  background: var(--lab-paper);
  margin-bottom: 20px;
  overflow: hidden;
}
.lab-toolbar.is-dragging {
  outline: 3px solid var(--accent-color);
  background: rgba(var(--accent-color-rgb), .12);
}
.lab-import-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px;
  background: rgba(var(--accent-color-rgb), .045);
}
.lab-import-row h2 {
  margin: 0 0 5px;
  font-size: .95rem;
  font-weight: 600;
}
.lab-import-row p {
  color: var(--text-secondary);
  font-size: .78rem;
  margin: 0;
}
.lab-toolbar-bottom {
  display: grid;
  gap: 14px;
  padding: 16px 20px 12px;
  border-top: 1px solid var(--lab-line);
}
.lab-source-control,
.lab-toolbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.lab-source-control {
  gap: 10px;
  min-width: 0;
  font-size: .8rem;
}
.lab-source-label {
  color: var(--text-secondary);
  font-size: .75rem;
}
.lab-source-control strong {
  font-weight: 500;
  overflow-wrap: anywhere;
  min-width: 0;
}
.lab-data-state {
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--lab-soft);
  color: var(--text-secondary);
  font-size: .68rem;
  white-space: nowrap;
}
.lab-data-state[data-modified=true] {
  background: rgba(var(--accent-color-rgb), .1);
  color: var(--accent-color);
}
.lab-toolbar-actions {
  justify-content: space-between;
  gap: 10px 20px;
}
.lab-source-note {
  font-size: .72rem;
  color: var(--text-secondary);
  margin: 0;
  padding: 0 20px 12px;
  overflow-wrap: anywhere;
}
.lab-import-status {
  color: var(--accent-color);
  margin: 0;
  padding: 0 20px 10px;
  font-size: .8rem;
  overflow-wrap: anywhere;
}
.lab-import-status.is-error {
  color: var(--lab-danger);
}
.lab-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
}
.lab-nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 9px 12px;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: .84rem;
  white-space: nowrap;
}
.lab-nav .lab-nav-number {
  font-size: .72rem;
  font-variant-numeric: tabular-nums;
}
.lab-nav a:hover,
.lab-nav a[aria-current=location] {
  background: rgba(var(--accent-color-rgb), .09);
  color: var(--accent-color);
}
.lab-use-hint {
  color: var(--text-secondary);
  font-size: .76rem;
  margin: 14px 4px;
}
.lab-report {
  background: var(--lab-paper);
  border: 1px solid var(--lab-line);
  padding: 26px 34px;
  box-shadow: 0 3px 18px rgba(0, 0, 0, .025);
}
.lab-report-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 2px solid var(--text-color);
  padding-bottom: 18px;
  margin-bottom: 4px;
}
.lab-report-heading h2 {
  margin: 0;
  font-weight: 600;
  font-size: 1.45rem;
  letter-spacing: .3em;
}
.lab-report-heading > span {
  font-size: .78rem;
}
.lab-report-heading > span:last-child {
  color: var(--text-secondary);
}
.lab-question {
  padding: 26px 0;
  border-bottom: 1px solid var(--lab-line);
  scroll-margin-top: calc(var(--lab-bar-height) + 18px);
  min-width: 0;
}
.lab-question:last-child {
  border-bottom: none;
  padding-bottom: 8px;
}
.lab-question-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 12px;
}
.lab-question-heading h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}
.lab-question-heading button {
  flex-shrink: 0;
}
.lab-prompt {
  font-size: .88rem;
  line-height: 2.15;
  margin: 0 0 18px;
}
.lab-readings {
  line-height: 2.3;
}
.lab-reading {
  display: inline-block;
  white-space: nowrap;
  max-width: 100%;
  vertical-align: baseline;
}
.lab-table-scroll {
  overflow-x: auto;
}
.lab-scroll-hint {
  display: none;
  color: var(--text-secondary);
  font-size: .72rem;
  margin: 0 0 8px;
}
.lab-instrument-results {
  width: 100%;
  min-width: 840px;
  table-layout: fixed;
  border-collapse: collapse;
  text-align: center;
  font-size: .82rem;
}
.lab-instrument-results .instrument-col {
  width: 9%;
}
.lab-instrument-results .scale-col {
  width: 15%;
}
.lab-instrument-results .measurement-col {
  width: 15%;
}
.lab-instrument-results .expression-col {
  width: 23%;
}
.lab-instrument-results th,
.lab-instrument-results td {
  border: 1px solid var(--lab-line);
  padding: 14px 8px;
  vertical-align: middle;
}
.lab-instrument-results thead th {
  background: var(--lab-soft);
  font-weight: 500;
  padding-block: 12px;
}
.lab-instrument-results tbody th {
  background: var(--lab-soft);
  font-weight: 500;
}
.lab-input-unit {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
}
.lab-input-unit > span {
  font-size: .76rem;
  color: var(--text-secondary);
}
.physics-page input:not([type=file]),
.physics-page textarea {
  background: var(--lab-input);
  color: var(--text-color);
  border: 1px solid var(--lab-line);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: .85rem;
}
.physics-page input:not([type=file]) {
  width: 100%;
  min-width: 0;
  height: 35px;
  padding: 7px;
  text-align: center;
}
.physics-page input[aria-invalid=true],
.physics-page textarea[aria-invalid=true] {
  border-color: var(--lab-danger);
}
.physics-page :is(button, a, input, textarea, select, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 3px;
}
.lab-meter-settings label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: .72rem;
  white-space: nowrap;
}
.lab-meter-settings label + label {
  margin-top: 6px;
}
.lab-meter-settings input:not([type=file]) {
  width: 47px;
  height: 28px;
  font-size: .75rem;
  padding: 3px;
}
.lab-answer-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.lab-answer-value {
  padding: 7px 9px;
  font-size: .93rem;
  line-height: 1.4;
  min-width: 65px;
  white-space: nowrap;
}
.lab-unit {
  color: var(--text-secondary);
  font-size: .72rem;
  white-space: nowrap;
}
.lab-answer-meta {
  display: block;
  color: var(--text-secondary);
  margin-top: 5px;
  font-size: .64rem;
  line-height: 1.5;
  text-align: center;
}
.lab-data-editor {
  margin: 0 0 12px;
  background: var(--lab-soft);
  border: 1px solid var(--lab-line);
  border-radius: 5px;
  padding: 10px 14px;
}
.lab-data-editor summary {
  color: var(--accent-color);
  cursor: pointer;
  font-size: .78rem;
}
.lab-data-editor > label {
  display: block;
  margin-top: 14px;
  font-size: .78rem;
}
.physics-page textarea {
  display: block;
  width: 100%;
  resize: vertical;
  min-height: 76px;
  margin-top: 8px;
  padding: 10px;
  line-height: 1.8;
}
.lab-data-editor p {
  font-size: .73rem;
  color: var(--text-secondary);
  margin: 8px 0 2px;
}
.lab-error {
  font-size: .78rem;
  color: var(--lab-danger);
  margin: 8px 0;
  line-height: 1.6;
}
.lab-solution-intro {
  margin: 22px 0 6px;
  font-size: .9rem;
  font-weight: 500;
}
.lab-result-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  align-items: center;
  gap: 24px;
  padding: 15px 4px;
  min-height: 78px;
  border-bottom: 1px solid rgba(var(--text-secondary-rgb), .10);
}
.lab-result-row:last-child {
  border-bottom: 0;
}
.lab-result-row.is-expression {
  background: var(--lab-soft);
  padding-inline: 12px;
  margin-inline: -8px;
  border: 0;
}
.lab-result-method {
  min-width: 0;
}
.lab-result-formula {
  overflow-x: auto;
  padding: 7px 2px;
  font-size: 1.04rem;
}
.lab-formula-note {
  display: block;
  margin-top: 2px;
  padding-inline: 2px;
  color: var(--text-secondary);
  font-size: .73rem;
  line-height: 1.6;
}
.lab-result-answer {
  justify-self: stretch;
}
.lab-result-answer .lab-answer-cell {
  justify-content: flex-end;
}
.lab-result-answer .lab-unit {
  min-width: 40px;
}
.lab-result-answer .lab-answer-meta {
  text-align: right;
  padding-right: 46px;
}
.lab-result-group {
  font-size: .94rem;
  font-weight: 600;
  margin: 24px 0 2px;
}
.lab-formulas {
  margin-top: 18px;
  padding: 12px 15px;
  border-left: 3px solid rgba(var(--accent-color-rgb), .35);
  background: var(--lab-soft);
}
.lab-formulas summary {
  cursor: pointer;
  font-size: .78rem;
  color: var(--text-secondary);
}
.lab-formulas p {
  font-size: .78rem;
  color: var(--text-secondary);
  line-height: 1.9;
  margin: 12px 0 0;
}
.lab-method-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}
.lab-method-grid h4 {
  font-size: .8rem;
  font-weight: 600;
  margin: 0;
}
.lab-equation {
  overflow-x: auto;
  max-width: 100%;
  font-size: .95rem;
  padding: 12px 2px 4px;
}
.physics-page mjx-container {
  margin: 0 !important;
}
.physics-page mjx-container svg {
  max-width: none;
  height: revert;
}
.physics-page [data-tex]:empty {
  min-height: 1em;
}
.physics-page mjx-assistive-mml {
  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;
}
.lab-cylinder-inputs {
  display: grid;
  gap: 10px;
  margin-top: 16px;
  max-width: 680px;
}
.lab-cylinder-inputs > div {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr) 18px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  font-size: .8rem;
}
.lab-toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 10px);
  border-radius: 8px;
  padding: 12px 20px;
  background: var(--text-color);
  color: var(--bg-color);
  box-shadow: 0 8px 30px var(--card-shadow);
  max-width: calc(100% - 32px);
  font-size: .82rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s, transform .15s;
  z-index: 20;
}
.lab-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
.lab-copy-fallback {
  position: fixed;
  inset: 0 auto auto 0;
  opacity: 0;
  pointer-events: none;
}
@media (max-width: 1050px) {
  .lab-report {
    padding: 20px 24px;
  }
  .lab-scroll-hint {
    display: block;
  }
  .lab-result-row {
    grid-template-columns: minmax(0, 1fr) 210px;
    gap: 12px;
  }
}
@media (max-width: 900px) {
  .physics-page {
    --lab-bar-height: 112px;
  }
  .lab-pagebar-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-rows: 40px 40px;
    gap: 8px 16px;
  }
  .lab-pagebar .theme-toggle {
    grid-column: 2;
    grid-row: 1;
    width: 40px;
    height: 40px;
  }
  .lab-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .lab-nav .lab-nav-number {
    display: none;
  }
  .lab-nav a {
    padding-inline: 4px;
  }
}
@media (max-width: 720px) {
  .lab-pagebar-inner {
    padding-inline: 12px;
  }
  .lab-workspace {
    padding: calc(var(--lab-bar-height) + 24px) 12px 40px;
  }
  .lab-total {
    padding-left: 15px;
  }
  .lab-import-row {
    padding: 16px;
    flex-wrap: wrap;
    gap: 12px;
  }
  .lab-toolbar-bottom {
    padding: 12px 16px;
  }
  .lab-toolbar-actions {
    align-items: stretch;
  }
  .lab-toolbar-actions > .lab-actions {
    width: 100%;
  }
  .lab-source-note,
  .lab-import-status {
    padding-inline: 16px;
  }
  .lab-nav {
    gap: 2px;
  }
  .lab-nav a {
    font-size: .74rem;
  }
  .lab-report {
    padding: 18px 14px;
  }
  .lab-report-heading {
    flex-wrap: wrap;
  }
  .lab-report-heading > span {
    font-size: .68rem;
  }
  .lab-report-heading > span:last-child {
    display: none;
  }
  .lab-question-heading h3 {
    font-size: .93rem;
  }
  .lab-prompt {
    font-size: .82rem;
  }
  .lab-result-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding-block: 12px;
  }
  .lab-result-answer {
    justify-self: end;
  }
  .lab-result-answer .lab-answer-meta {
    font-size: .64rem;
  }
  .lab-result-formula {
    width: 100%;
    font-size: .93rem;
  }
  .lab-method-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .lab-formulas {
    padding: 10px 12px;
  }
  .lab-cylinder-inputs > div {
    grid-template-columns: 70px minmax(0, 1fr) 12px minmax(0, 1fr);
    gap: 7px;
    font-size: .7rem;
  }
}
@media (max-width: 400px) {
  .lab-header h1 {
    font-size: 1.4rem;
  }
  .lab-total {
    padding-left: 10px;
    font-size: .62rem;
  }
  .lab-total strong {
    font-size: 1.5rem;
  }
  .lab-total strong span {
    font-size: .7rem;
  }
  .lab-report {
    padding-inline: 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .physics-page * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}
@media print {
  @page {
    margin: 12mm;
  }
  html,
  html[data-theme],
  .physics-page,
  [data-theme=dark] .physics-page {
    background: #fff !important;
    color-scheme: light;
  }
  .physics-page,
  [data-theme=dark] .physics-page {
    --bg-color: #fff;
    --text-color: #111;
    --text-secondary: #555;
    --accent-color: #111;
    --lab-paper: #fff;
    --lab-soft: #f6f6f6;
    --lab-input: #fff;
    --lab-line: #ccc;
  }
  .physics-page * {
    animation: none !important;
    transition: none !important;
    box-shadow: none !important;
  }
  .lab-pagebar,
  .lab-header,
  .lab-toolbar,
  .lab-use-hint,
  .lab-toast,
  .lab-formulas,
  .lab-question-heading button,
  .lab-data-editor,
  .lab-scroll-hint,
  .lab-answer-meta {
    display: none !important;
  }
  .lab-workspace {
    padding: 0;
    max-width: none;
  }
  .lab-report {
    padding: 0;
    border: 0;
  }
  .lab-question {
    padding-block: 16px;
  }
  .lab-report-heading {
    margin-bottom: 8px;
  }
  .lab-prompt {
    font-size: 9pt;
    line-height: 1.9;
  }
  .lab-question-heading {
    break-after: avoid;
  }
  .lab-solution-intro,
  .lab-result-group {
    break-after: avoid;
  }
  .lab-instrument-results {
    min-width: 0;
    font-size: 8pt;
  }
  .lab-instrument-results td,
  .lab-instrument-results th {
    padding: 7px 4px;
  }
  .lab-table-scroll {
    overflow: visible;
  }
  .lab-answer-value {
    color: #111;
    background: none;
    border: 0;
    font-size: 10pt;
    padding: 4px;
    min-width: 0;
  }
  .lab-unit {
    font-size: 8pt;
  }
  .lab-result-row {
    grid-template-columns: minmax(0, 1fr) 180px;
    gap: 12px;
    min-height: 58px;
    padding-block: 8px;
    break-inside: avoid;
  }
  .lab-result-formula {
    font-size: 10pt;
    overflow: visible;
  }
  .lab-result-answer {
    justify-self: stretch;
  }
  .physics-page input:not([type=file]) {
    border: 0;
    font-size: 9pt;
    height: 28px;
    padding: 4px;
  }
  .lab-meter-settings input:not([type=file]) {
    width: 36px;
    font-size: 8pt;
  }
  .lab-instrument-results tr {
    break-inside: avoid;
  }
  .lab-result-group {
    margin-top: 16px;
  }
}
.lab-credits {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--lab-line);
  color: var(--text-secondary);
  text-align: center;
  font-size: .82rem;
  line-height: 1.8;
}
.lab-credits p {
  margin: 0;
}
.lab-credits strong {
  font-weight: 500;
  color: var(--text-color);
}
@media (max-width: 576px) {
  .lab-toolbar-actions > .lab-actions {
    gap: 8px;
  }
  .lab-toolbar .btn {
    flex: 1 0 auto;
  }
}