/* The practice surface shares Unseel's palette; all changes are learner-paced. */
[data-lesson-root] { margin: 36px 0 56px; }
[data-lesson-root] [hidden] { display: none !important; }
[data-lesson-root] > p { color: var(--text-body, #b0bbcf); line-height: var(--reading-prose-line, 1.65); margin-bottom: 12px;  font-size: var(--reading-prose-size, inherit);}
[data-lesson-root] > h2 { font-family: 'Fraunces', Georgia, serif; font-size: 32px; font-weight: 400; color: var(--ink, #e8ecf5); margin-bottom: 12px; }
[data-lesson-app] { background: var(--lesson-surface, #0d1425); color: var(--text-body, #b0bbcf); border: 1px solid var(--lesson-line, #35425d); border-top: 3px solid var(--cyan, #4dd4ff); padding: 24px; margin-top: 24px; }
.lesson-topline { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: var(--lesson-action, #79ddff); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
[data-lesson-app] h3 { font-family: 'Fraunces', Georgia, serif; font-size: clamp(26px, 4vw, 34px); font-weight: 400; line-height: 1.2; margin: 18px 0 12px; color: var(--ink, #e8ecf5); }
.lesson-help, [data-lesson-status], .lesson-controls p, .lesson-measurement { color: var(--text-body, #b0bbcf); font-size: var(--reading-prose-size, 13px); line-height: var(--reading-prose-line, 1.7); }
.lesson-instructions, .lesson-answer-help { color: var(--text-body, #b0bbcf); font-size: var(--reading-prose-size, 13px); line-height: var(--reading-prose-line, 1.7); }
.lesson-instructions { padding: 8px 0 14px; border-bottom: 1px solid var(--lesson-line, #35425d); }
.lesson-instructions summary { cursor: pointer; color: var(--lesson-link, #8be4ff); padding: 6px 0; font-weight: 700; }
.lesson-instructions ol { padding-left: 22px; margin: 10px 0; }
.lesson-instructions li + li { margin-top: 8px; }
.lesson-instructions p { margin: 10px 0 0; }
.lesson-video-next { display: flex; align-items: center; flex-wrap: wrap; gap: 10px 20px; color: var(--text-body, #b0bbcf); font-size: var(--reading-prose-size, 14px); margin: 18px 0 0; }
.lesson-video-next a { display: inline-flex; align-items: center; min-height: 44px; padding: 10px 14px; border-radius: 4px; background: var(--lesson-action, #79ddff); color: var(--lesson-on-action, #071521); font-weight: 700; text-decoration: none; }
.lesson-video-next a:hover { background: var(--lesson-action-hover, #b7eeff); }
.lesson-video-next a:focus-visible { outline: 3px solid var(--gold, #ffd66b); outline-offset: 4px; }
.lesson-target-summary { border-left: 3px solid var(--lesson-action, #79ddff); padding: 10px 14px; background: var(--lesson-note, #111e30); color: var(--text-body, #b0bbcf); font-size: var(--reading-prose-size, 13px); line-height: var(--reading-prose-line, 1.7); margin: 16px 0 0; }
.lesson-target-summary[data-present=false] { border-color: var(--gold, #ffd66b); background: var(--lesson-warning-surface, #242232); color: var(--lesson-warning-text, #ffe7a4); }
.lesson-frame { display: block; width: 100%; height: 365px; border: 0; background: var(--bg, #0a0e1a); margin: 20px 0; }
[data-lesson-app] button, [data-lesson-app] input, [data-lesson-app] select { font: inherit; font-size: 13px; border: 1px solid var(--lesson-control-line, #63718b); border-radius: 4px; background: var(--lesson-control-surface, #151f34); color: var(--ink, #e8ecf5); min-height: 44px; padding: 10px 12px; }
[data-lesson-app] button { cursor: pointer; line-height: 1.4; }
[data-lesson-app] button:hover:not(:disabled) { border-color: var(--lesson-action, #79ddff); background: var(--lesson-control-hover, #1a2d43); }
[data-lesson-app] button:disabled { opacity: .5; cursor: default; }
[data-lesson-app] .lesson-primary { background: var(--lesson-action, #79ddff); color: var(--lesson-on-action, #071521); border-color: var(--lesson-action, #79ddff); font-weight: 700; }
[data-lesson-app] .lesson-primary:hover:not(:disabled) { background: var(--lesson-action-hover, #b7eeff); color: var(--lesson-on-action, #071521); }
[data-lesson-root] :focus-visible { outline: 3px solid var(--gold, #ffd66b); outline-offset: 4px; }
.lesson-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.lesson-controls { display: flex; flex-wrap: wrap; align-items: end; gap: 12px; padding-top: 24px; }
.lesson-controls label { display: grid; gap: 5px; color: var(--text-muted, #95a2bb); font-size: 12px; flex: 1 1 125px; min-width: 0; }
.lesson-controls input, .lesson-controls select { width: 100%; min-width: 0; box-sizing: border-box; }
.lesson-controls p { flex-basis: 100%; margin: 0; }
.lesson-practice h4, .lesson-complete h4 { font-family: 'JetBrains Mono', monospace; color: var(--ink, #e8ecf5); font-size: 18px; line-height: 1.5; margin: 20px 0 14px; }
.lesson-answers { display: flex; flex-wrap: wrap; gap: 10px; }
.lesson-answers button { flex: 1 1 145px; }
.lesson-feedback { color: var(--lesson-feedback, #e3dcb8); font-size: var(--reading-prose-size, 14px); line-height: var(--reading-prose-line, 1.7); }
.lesson-feedback:empty { display: none; }
.lesson-complete { border-top: 1px solid var(--green, #4dff91); margin-top: 26px; padding-top: 8px; color: var(--text-body, #b0bbcf); font-size: var(--reading-prose-size, 14px); }
.lesson-next { display: inline-block; color: var(--lesson-link, #8be4ff); padding: 10px 0; font-weight: 700; text-underline-offset: 4px; }
.lesson-next-reason { margin: 0 0 16px; }
.lesson-complete small { display: block; color: var(--text-body, #b0bbcf); line-height: 1.6; }
.lesson-measurement { margin-top: 28px; border-top: 1px solid var(--lesson-line, #35425d); padding-top: 16px; }
.lesson-measurement summary { cursor: pointer; padding: 6px 0; }
.lesson-measurement label { display: flex; gap: 12px; align-items: center; margin: 12px 0; }
.lesson-measurement input[type=checkbox] { width: 20px; min-height: 20px; flex-shrink: 0; accent-color: var(--lesson-action, #79ddff); }
.lesson-measurement a, .lesson-scene a { color: var(--lesson-link, #8be4ff); }
html.lesson-scene-page, .lesson-scene-page body { height: auto; min-height: 100%; overflow: auto; background: var(--bg, #0a0e1a); }
.lesson-scene { padding: 18px; margin: 0; font: 13px/1.6 'JetBrains Mono', monospace; color: var(--text-body, #b0bbcf); }
.lesson-scene-label { margin: 0 0 16px; font-size: 11px; color: var(--text-muted, #95a2bb); }
.lesson-array { display: grid; grid-template-columns: repeat(auto-fit, minmax(59px, 1fr)); gap: 8px; }
.lesson-cell { display: grid; justify-items: center; align-content: center; border: 1px solid var(--lesson-cell-line, #526c8a); border-radius: 4px; padding: 10px 2px; background: var(--lesson-cell-surface, #101f31); min-width: 0; }
.lesson-cell strong { color: var(--ink, #e8ecf5); font-size: 19px; }
.lesson-cell span { font-size: 10px; }
.lesson-cell small { font-size: 9px; }
.lesson-cell[data-state=excluded] { background: var(--lesson-excluded-surface, #111523); border-style: dashed; border-color: var(--lesson-line, #35425d); color: var(--text-muted, #95a2bb); }
.lesson-cell[data-state=excluded] strong { color: var(--text-muted, #95a2bb); text-decoration: line-through; }
.lesson-cell[data-state=found] { border: 2px solid var(--green, #4dff91); background: var(--lesson-found-surface, #113328); color: var(--lesson-found-text, #a3f6cb); }
.lesson-bounds { color: var(--lesson-link, #8be4ff); font-size: 12px; margin-top: 16px; }
.lesson-scene-explanation { margin: 12px 0 0;  font-size: var(--reading-prose-size, inherit); line-height: var(--reading-prose-line, inherit);}
/* Only long-form reading roles change font; controls and array data remain mono. */
[data-lesson-root] > p, .lesson-help, [data-lesson-status], .lesson-controls p,
.lesson-measurement, .lesson-instructions, .lesson-answer-help, .lesson-video-next,
.lesson-target-summary, .lesson-feedback, .lesson-complete, .lesson-scene-explanation {
  font-family: var(--reading-prose-font, inherit);
}
@media (max-width: 600px) {
  [data-lesson-app] { padding: 16px; }
  .lesson-frame { height: 540px; }
  .lesson-scene { padding: 12px; }
  .lesson-array { gap: 6px; }
  .lesson-controls [data-action=apply] { width: 100%; }
}
@media (prefers-reduced-motion: reduce) { [data-lesson-root] *, .lesson-scene * { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }