/* Lees & doe: interactive parts (quiz, puzzles, riddles, checklists, thought experiments, models). */
@layer components {
  .activity-workspace { margin-block: 28px; padding: clamp(16px, 3vw, 24px); border: 2px solid var(--subject-accent, var(--green)); border-radius: 16px; background: var(--surface); }
  .activity-workspace h3 { margin-top: 0; }
  .workspace-prompt { margin-bottom: 18px; }
  .workspace-palette, .workspace-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-block: 10px; }
  .activity-workspace button { min-height: 44px; padding: 8px 12px; border: 1px solid var(--rule); border-radius: 8px; background: var(--paper); color: var(--ink); font: inherit; cursor: pointer; }
  .activity-workspace button:disabled { opacity: .5; cursor: default; }
  .activity-workspace button:focus-visible, .activity-workspace canvas:focus-visible, .activity-workspace textarea:focus-visible { outline: 3px solid var(--subject-accent, var(--green)); outline-offset: 3px; }
  .workspace-color { display: flex; align-items: center; gap: 6px; }
  .workspace-color span { width: 18px; height: 18px; border-radius: 50%; background: var(--swatch); border: 1px solid var(--ink); }
  .workspace-color[aria-pressed=true] { box-shadow: inset 0 0 0 2px var(--ink); }
  .workspace-panels { display: grid; grid-template-columns: 1fr; gap: 16px; }
  .workspace-panels[data-count='2'], .workspace-panels[data-count='4'] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .workspace-panels[data-count='3'], .workspace-panels[data-count='6'] { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .workspace-panel { min-width: 0; }
  .workspace-panel > label, .workspace-writing-label { display: block; margin-bottom: 8px; font-weight: 700; }
  .activity-workspace canvas { display: block; width: 100%; aspect-ratio: 4 / 3; border: 1px solid var(--rule); border-radius: 8px; background: var(--paper); touch-action: none; cursor: crosshair; }
  .workspace-help, .workspace-status { font-size: .9em; }
  .workspace-status { min-height: 1.4em; margin-bottom: 0; }
  .workspace-writing { display: block; box-sizing: border-box; width: 100%; min-height: var(--workspace-height, 80mm); padding: 12px; border: 1px solid var(--rule); border-radius: 8px; font: inherit; line-height: 1.7; resize: vertical; color: var(--ink); background: var(--paper); }
  @media (max-width: 760px) { .workspace-panels[data-count='3'], .workspace-panels[data-count='6'] { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
  @media (max-width: 480px) { .workspace-panels[data-count] { grid-template-columns: 1fr; } }
  .text-button {
    background: none;
    text-decoration: underline;
    text-underline-offset: 4px;
    font-size: 14px;
    padding: 12px;
    margin: 4px;
  }
  .puzzle-feedback {
    font-size: 14px;
    line-height: 1.55;
    min-height: 22px;
    margin: 17px 0 10px;
  }
  .puzzle-shell {
    padding: 25px;
    background: var(--subject-tint);
    border: 1px solid color-mix(in srgb, var(--subject) 22%, var(--subject-tint));
    border-radius: 5px;
    margin: 23px 0;
  }
  .puzzle-actions {
    display: flex;
    justify-content: center;
    gap: 9px;
    flex-wrap: wrap;
  }

  /* --- Quiz ------------------------------------------------------------------------------------ */
  .quiz {
    margin: 25px 0;
  }
  .quiz fieldset {
    border: 0;
    border-bottom: 1px solid var(--line);
    padding: 0 0 19px;
    margin: 0 0 22px;
    min-width: 0;
  }
  .quiz legend {
    font: 700 19px/1.4 var(--display);
    margin-bottom: 11px;
    display: flex;
    gap: 12px;
    align-items: baseline;
  }
  .quiz legend > span {
    background: var(--lime);
    color: var(--on-accent);
    padding: 2px 8px;
    border-radius: 4px;
  }
  .quiz label {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 8px 10px;
    border: 1px solid var(--line);
    margin: 6px 0;
    font-size: 15px;
    border-radius: 4px;
    cursor: pointer;
  }
  .quiz label:has(input:checked) {
    background: var(--subject-tint);
    border-color: var(--subject);
  }
  /* After checking: the right option is marked by a border and a tick, not by colour alone. */
  .quiz label.is-answer {
    border: 2px solid var(--ok);
  }
  .quiz label.is-answer .option-text::after {
    content: ' ✓';
    color: var(--ok);
    font-weight: 800;
  }
  .option-letter {
    flex: none;
    display: inline-grid;
    place-items: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 1.5px solid var(--subject);
    color: color-mix(in srgb, var(--subject) 85%, var(--ink));
    font-size: 13px;
    font-weight: 800;
  }
  .quiz input {
    accent-color: var(--green);
    width: 18px;
    height: 18px;
    flex-shrink: 0;
  }
  .quiz-explanation {
    font-size: 15px;
    line-height: 1.55;
    padding: 12px 14px;
    border-radius: 3px;
    border-left: 4px solid var(--ok);
    background: var(--ok-tint);
    margin: 12px 0 0;
  }
  .quiz-explanation.try-again {
    border-left-color: var(--warn);
    background: var(--warn-tint);
  }

  /* --- Sudoku ---------------------------------------------------------------------------------- */
  .sudoku-grid {
    display: grid;
    grid-template-columns: repeat(var(--size), 1fr);
    max-width: 390px;
    border: 3px solid var(--green);
    margin: 0 auto 23px;
  }
  .sudoku-grid input {
    width: 100%;
    min-width: 0;
    aspect-ratio: 1;
    border: 0;
    border-right: 1px solid color-mix(in srgb, var(--green) 28%, var(--paper));
    border-bottom: 1px solid color-mix(in srgb, var(--green) 28%, var(--paper));
    border-radius: 0;
    display: block;
    text-align: center;
    font: 600 29px var(--display);
    color: var(--green);
    background: var(--paper);
    padding: 0;
    caret-color: var(--green);
  }
  .sudoku-grid input[readonly] {
    background: var(--subject-tint);
    font-weight: 800;
  }
  .sudoku-grid input.box-right {
    border-right: 3px solid var(--green);
  }
  .sudoku-grid input.box-bottom {
    border-bottom: 3px solid var(--green);
  }
  /* A wrong digit: thick red-orange inset border and a struck-through digit, not colour alone. */
  .sudoku-grid input.incorrect {
    background: var(--warn-tint);
    box-shadow: inset 0 0 0 3px var(--warn);
    color: var(--warn);
    text-decoration: line-through;
  }
  .sudoku-grid input.hint {
    background: var(--lime);
  }

  /* --- Word search ----------------------------------------------------------------------------- */
  .word-grid {
    display: grid;
    grid-template-columns: repeat(var(--size), 1fr);
    max-width: 480px;
    border: 2px solid var(--green);
    margin: auto;
  }
  .word-grid button {
    aspect-ratio: 1;
    border-right: 1px solid color-mix(in srgb, var(--green) 22%, var(--paper));
    border-bottom: 1px solid color-mix(in srgb, var(--green) 22%, var(--paper));
    font: 700 20px var(--display);
    background: var(--paper);
    padding: 0;
  }
  .word-grid button.selected {
    background: var(--warn-tint);
    box-shadow: inset 0 0 0 3px var(--warn);
  }
  .word-grid button.found {
    background: var(--lime);
    color: var(--on-accent);
  }
  .word-list {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin: 22px 0;
    padding: 0;
    list-style: none;
  }
  .word-list li {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 30px;
    font-size: 14px;
    font-weight: 700;
    padding: 5px 12px;
  }
  .word-list li.found {
    background: var(--lime);
    color: var(--on-accent);
    text-decoration: line-through;
  }

  /* --- Maze ------------------------------------------------------------------------------------ */
  .maze-grid {
    display: grid;
    grid-template-columns: repeat(var(--size), 1fr);
    max-width: 430px;
    margin: 0 auto;
    border: 2px solid var(--green);
  }
  .maze-grid button {
    aspect-ratio: 1;
    background: var(--paper);
    padding: 0;
    font-size: 24px;
    border-radius: 0;
    line-height: 1;
    opacity: 1;
  }
  .maze-grid .wall {
    background: var(--green);
    cursor: default;
  }
  .maze-grid .trail {
    background: color-mix(in srgb, var(--lime) 45%, var(--paper));
  }
  .maze-grid .player {
    color: var(--warn);
    background: var(--lime);
  }
  .maze-grid .exit {
    color: var(--warn);
  }
  .maze-controls {
    display: flex;
    gap: 9px;
    justify-content: center;
    margin: 18px 0;
  }
  .maze-controls button {
    width: 48px;
    height: 48px;
    background: var(--green);
    color: var(--lime);
    font-size: 22px;
    border-radius: 4px;
  }

  /* --- Riddles --------------------------------------------------------------------------------- */
  .riddle-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin: 25px 0;
  }
  .riddle {
    padding: 22px;
    background: var(--subject-tint);
    border-radius: 3px;
  }
  .riddle:nth-child(even) {
    background: color-mix(in srgb, var(--lime) 25%, var(--paper));
  }
  .riddle-number {
    font: 800 28px var(--display);
    color: var(--subject);
  }
  .riddle h3 {
    font: 700 20px/1.3 var(--display);
    margin: 11px 0 20px;
  }
  .riddle details {
    font-size: 15px;
    line-height: 1.55;
  }
  .riddle summary {
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 4px;
  }

  /* --- Field-guide checklist ------------------------------------------------------------------- */
  .field-checklist {
    display: grid;
    gap: 12px;
    margin: 25px 0;
  }
  .field-checklist label {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: 14px 18px;
    background: var(--subject-tint);
    border-radius: 4px;
    font-size: 15px;
  }
  .field-checklist input {
    width: 21px;
    height: 21px;
    flex-shrink: 0;
    accent-color: var(--green);
  }
  .field-checklist label:has(input:checked) {
    background: var(--lime);
  }
  .checklist-progress {
    font-size: 14px;
    font-weight: 700;
  }

  /* --- Thought experiments --------------------------------------------------------------------- */
  .thought-experiments {
    display: grid;
    gap: 26px;
    margin: 25px 0;
  }
  .thought-card {
    padding: 26px;
    border: 1px solid var(--line);
    border-top: 4px solid var(--subject);
    background: color-mix(in srgb, var(--bg) 65%, var(--paper));
  }
  .thought-card h3 {
    font: 800 27px/1.15 var(--display);
    letter-spacing: -0.7px;
    margin: 12px 0 17px;
  }
  .thought-card p,
  .thought-card li {
    font-size: 16px;
    line-height: 1.7;
  }
  .thought-card .thought-question {
    font-weight: 750;
    font-size: 18px;
  }
  .thought-card ul {
    padding-left: 22px;
  }
  .thought-note-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    margin: 23px 0;
  }
  .thought-note-label textarea {
    display: block;
    width: 100%;
    resize: vertical;
    font: 16px/1.6 var(--body);
    border: 1px solid color-mix(in srgb, var(--ink) 40%, var(--paper));
    padding: 12px;
    margin-top: 8px;
    background: var(--paper);
    color: var(--ink);
  }
  .thought-card details {
    background: var(--paper);
    padding: 16px 19px;
    margin-top: 20px;
  }
  .thought-card summary {
    font-weight: 750;
    cursor: pointer;
  }
  .thought-caveat {
    border-left: 3px solid var(--subject);
    padding-left: 14px;
  }
  /* Predict first (doel.md §5): an answer field above every reveal, and a nudge when it is still empty. */
  .predict-label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    margin: 4px 0 12px;
  }
  .predict-label input {
    display: block;
    width: 100%;
    margin-top: 6px;
    padding: 9px 11px;
    font: 16px/1.4 var(--body);
    color: var(--ink);
    background: var(--paper);
    border: 1px solid color-mix(in srgb, var(--ink) 40%, var(--paper));
    border-radius: 4px;
  }
  .predict-hint {
    margin: 0;
    font-size: 14px;
    font-weight: 700;
    color: var(--warn);
  }
  .predict-hint:empty {
    display: none;
  }
  .reveal summary {
    display: inline-block;
    padding: 6px 0;
  }

  /* --- Interactive models (VECTOR simulations) ------------------------------------------------- */
  .simulation {
    margin: 25px 0;
    padding: 25px;
    background: var(--subject-tint);
    border-top: 4px solid var(--subject);
  }
  .simulation h3 {
    font: 800 27px/1.15 var(--display);
    letter-spacing: -0.7px;
    margin: 8px 0 16px;
  }
  .simulation-heading p {
    font-size: 15px;
    line-height: 1.7;
  }
  .simulation-chart {
    background: var(--paper);
    padding: 8px;
    border: 1px solid var(--line);
    margin: 20px 0;
  }
  .simulation-chart svg {
    display: block;
    width: 100%;
    height: auto;
  }
  .simulation-chart .curve {
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
  }
  .primary-curve {
    stroke: var(--subject);
  }
  .second-curve {
    stroke: var(--warn);
    stroke-dasharray: 6 5;
  }
  .simulation-chart .sum-curve {
    stroke: var(--ink);
    stroke-width: 4;
  }
  .chart-grid line {
    stroke: var(--line);
    stroke-width: 1;
  }
  .chart-grid text {
    font: 13px var(--body);
    fill: var(--muted);
  }
  .chart-markers circle,
  .chart-markers .off-chart {
    fill: var(--warn);
    stroke: white;
    stroke-width: 2;
  }
  .chart-markers line {
    stroke: var(--warn);
    stroke-dasharray: 4 4;
  }
  .simulation-parameters {
    display: grid;
    gap: 16px;
  }
  .simulation-parameters label {
    display: block;
  }
  .simulation-parameters label > span {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    font-weight: 700;
  }
  .simulation-parameters output {
    font-variant-numeric: tabular-nums;
  }
  .simulation-parameters input {
    width: 100%;
    height: 32px;
    accent-color: var(--green);
    cursor: pointer;
  }
  .simulation-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 13px;
    align-items: center;
    margin-top: 19px;
  }
  .simulation-result {
    font-size: 15px;
    line-height: 1.6;
    padding: 13px 16px;
    background: var(--paper);
    border-left: 3px solid var(--subject);
    font-variant-numeric: tabular-nums;
  }
  .simulation-caption {
    font-size: 13px;
    color: var(--muted);
  }
  .wave-legend {
    display: flex;
    gap: 18px;
    font-size: 13px;
    font-weight: 700;
    flex-wrap: wrap;
    margin: 10px 0;
  }
  .wave-legend span::before {
    content: '';
    display: inline-block;
    width: 22px;
    height: 0;
    border-top: 3px solid var(--subject);
    vertical-align: middle;
    margin-right: 6px;
  }
  .wave-legend .key-b::before {
    border-top: 3px dashed var(--warn);
  }
  .wave-legend .key-sum::before {
    border-top: 4px solid var(--ink);
  }

  @media (max-width: 1100px) {
    .riddle-grid {
      grid-template-columns: 1fr;
    }
    .sudoku-grid input {
      font-size: 25px;
    }
  }
  @media (max-width: 900px) {
    .thought-card {
      padding: 22px;
    }
  }
  @media (max-width: 800px) {
    .riddle-grid {
      grid-template-columns: 1fr 1fr;
    }
  }
  @media (max-width: 759.98px) {
    .simulation {
      padding: 20px;
    }
  }
  @media (max-width: 540px) {
    .puzzle-shell {
      padding: 17px 12px;
    }
    .sudoku-grid input {
      font-size: 26px;
    }
    .puzzle-actions {
      gap: 7px;
    }
    .puzzle-actions .button {
      font-size: 12px;
      padding: 11px 13px;
      min-height: 44px;
    }
    .word-grid button {
      font-size: 16px;
    }
    .maze-grid button {
      font-size: 18px;
    }
  }
  /* Very narrow phones: the word grid uses the whole page width, so letters stay ≥ 24 px touch targets. */
  @media (max-width: 360px) {
    .wordsearch .word-grid {
      max-width: none;
      margin-inline: -32px;
      border-inline: 0;
    }
    .quiz legend {
      font-size: 18px;
    }
    .quiz label {
      font-size: 14px;
    }
    .quiz .button {
      font-size: 13px;
    }
    .riddle-grid {
      grid-template-columns: 1fr;
      gap: 14px;
    }
    .thought-card {
      padding: 20px 16px;
    }
    .thought-card h3 {
      font-size: 23px;
    }
    .simulation {
      padding: 18px 14px;
    }
    .simulation h3 {
      font-size: 23px;
    }
    .simulation-actions .button {
      font-size: 12px;
      padding: 11px 12px;
    }
    .simulation-chart {
      padding: 0;
    }
    /* The chart is drawn in 620 user units: larger tick text keeps it readable at phone width. */
    .chart-grid text {
      font-size: 26px;
    }
    .simulation-result {
      font-size: 14px;
    }
  }
}