/* The same compact, numbered study navigation used by the physics workspace. */
.science-workspace { --science-nav-clearance: 90px; }
.science-unit-picker { margin: 20px 0 14px; padding: 15px 17px; border: 1px solid #d8e1d1; border-radius: 10px; background: #f1f4e9; }
.science-unit-label { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 9px; font-size: 12px; color: #61735b; }
.science-unit-label label { font-weight: 600; color: var(--ink); }
.science-unit-label > span { font-variant-numeric: tabular-nums; }
.science-unit-controls { display: grid; grid-template-columns: 44px minmax(0, 1fr) 44px; gap: 8px; }
.science-unit-controls select { width: 100%; min-width: 0; min-height: 44px; padding: 9px 10px; border: 1px solid #ccd8c5; border-radius: 6px; color: var(--ink); background: #fffef8; font-size: 13px; }
.science-unit-arrow { display: flex; align-items: center; justify-content: center; min-height: 44px; border: 1px solid #ccd8c5; border-radius: 6px; color: var(--green); background: #fffef8; font-size: 20px; }
.science-unit-arrow:not(:disabled):hover { background: #e5eddb; }
.science-unit-arrow:disabled { opacity: .4; cursor: default; }
.science-learning-nav { position: sticky; top: 8px; z-index: 18; display: grid; grid-template-columns: repeat(var(--science-step-count), minmax(0, 1fr)); gap: 5px; padding: 8px; margin: 0 0 24px; border: 1px solid #d8e1d1; border-radius: 10px; background: #f9f9f4f5; box-shadow: 0 5px 15px #233c3208; backdrop-filter: blur(12px); }
.science-learning-nav a { display: flex; align-items: center; justify-content: center; gap: 8px; min-width: 0; min-height: 44px; padding: 7px 9px; border-radius: 6px; color: #61735b; font-size: 12px; font-weight: 600; line-height: 1.5; text-align: center; }
.science-learning-nav .science-step-index { color: inherit; font-size: 11px; font-weight: 500; font-variant-numeric: tabular-nums; opacity: .8; }
.science-learning-nav a:hover { background: #eaf0e2; }
.science-learning-nav a.current { color: white; background: var(--green); }
.science-learning-nav a:focus-visible { outline-offset: -3px; outline-color: #dfa255; }
.science-workspace :is(#lab, #understand, #practice, #activity) { scroll-margin-top: var(--science-nav-clearance); }
.science-section-heading { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 20px; }
.science-section-number { flex: 0 0 38px; display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid #cddac3; border-radius: 9px; color: var(--green); background: #eef3e5; font-size: 14px; font-variant-numeric: tabular-nums; }
.science-section-heading h2 { margin: 0; font-size: 23px; font-weight: 600; line-height: 1.6; letter-spacing: .02em; }
.science-section-heading p { margin: 5px 0 0; color: #61735b; font-size: 12px; line-height: 1.85; }
.science-section-heading > #lesson-score { flex-shrink: 0; margin: 11px 0 0 auto; font-size: 12px; color: #61735b; }
.science-workspace .science-exact-value { display: flex; align-items: center; gap: 9px; width: 100%; min-width: 0; margin: 8px 0 12px; }
.science-workspace .science-exact-value input { flex: 1; width: 100%; min-width: 0; min-height: 42px; padding: 8px 10px; border: 1px solid #c6d4bf; border-radius: 6px; background: #fffef8; color: var(--ink); font-size: 15px; font-variant-numeric: tabular-nums; }
.science-workspace .science-exact-value > span { flex-shrink: 0; color: #61735b; font-size: 12px; }
.science-workspace .science-exact-value input:invalid { border-color: #ab583e; }
.science-workspace .science-exact-value:has(input:invalid) > span { color: #ab583e; }
.science-workspace .science-activity-heading { align-items: flex-start; gap: 14px; }
.science-workspace .science-activity-heading > div { flex: 1; min-width: 0; }
.science-workspace .science-activity-heading .activity-label { flex-shrink: 0; margin-top: 5px; }
.science-workspace #lab > .science-section-heading { margin: 0; padding: 24px 25px 20px; background: #fafbf5; }
.science-workspace #lab .lab-heading { border-top: 1px solid #dfe5d9; }
.science-workspace .section-heading:has(> .science-section-heading) { align-items: flex-start; }
.science-workspace .section-heading > .science-section-heading { margin: 0; }
.science-workspace .section-heading > #lesson-score { flex-shrink: 0; margin-top: 11px; }
.science-section-links { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 20px; margin: 23px 0 0; padding: 16px 0 0; border-top: 1px solid #d8e1d1; font-size: 12px; line-height: 1.8; }
.science-section-links > span { color: #61735b; }
.science-section-links a { padding: 6px 0; color: var(--green); text-decoration: underline; text-underline-offset: 4px; }
.science-section-links .science-next-step { display: inline-flex; align-items: center; gap: 18px; margin-left: auto; font-weight: 600; }
.science-workspace #lab > .science-section-links { margin: 0; padding: 16px 25px; background: #fafbf5; }
@media (max-width: 720px) {
  .science-unit-picker { padding: 13px 12px; }
  .science-learning-nav { gap: 3px; padding: 6px; margin-bottom: 20px; border-radius: 8px; }
  .science-learning-nav a { flex-direction: column; gap: 1px; padding: 6px 3px; font-size: 12px; }
  .science-learning-nav .science-step-index { font-size: 11px; }
  .science-section-heading { gap: 10px; }
  .science-workspace .science-activity-heading { gap: 10px; }
  .science-section-heading h2 { font-size: 21px; }
  .science-section-heading p { font-size: 12px; }
  .science-section-number { flex-basis: 33px; width: 33px; height: 33px; font-size: 13px; }
  .science-workspace #lab > .science-section-heading { padding: 20px 16px 17px; }
  .science-workspace #lab > .science-section-links { padding: 14px 16px; }
}
@media (max-width: 480px) {
  .science-unit-controls { grid-template-columns: 42px minmax(0, 1fr) 42px; gap: 6px; }
  .science-unit-controls select { font-size: 12px; padding: 8px; }
  .science-workspace .practice .section-heading { flex-wrap: wrap; }
  .science-workspace .practice .science-section-heading { flex-wrap: wrap; }
  .science-workspace .practice .science-section-heading > div { flex: 1; min-width: 0; }
  .science-section-heading > #lesson-score { flex-basis: calc(100% - 43px); margin: 0 0 0 43px; }
  .science-workspace .section-heading > #lesson-score { margin: -5px 0 0 43px; }
  .science-section-links .science-next-step { width: 100%; justify-content: space-between; }
}
@media (prefers-reduced-motion: reduce) {
  .science-workspace { scroll-behavior: auto; }
}