.ld-activity { padding: clamp(1.25rem,3vw,3rem); border: 2px solid var(--ld-blue,#0084a5); border-radius: 16px; background: #f5f6f7; }
.ld-activity [hidden] { display:none !important; }
.ld-activity h3 { margin-top:1.4rem; }
.ld-activity fieldset { border:0; padding:0; margin:1.5rem 0; min-width:0; }
.ld-activity legend { font-size:1.15em; font-weight:700; margin-bottom:1rem; }
.ld-activity .ld-practice-option { display:flex; gap:.8rem; align-items:baseline; margin:.7rem 0; padding:1rem; background:white; border:1px solid #cdd5d9; border-radius:12px; }
.ld-activity .ld-practice-option.is-muted { opacity:.5; }
.ld-activity input { accent-color:#0084a5; }
.ld-activity [data-path-result],.ld-activity [data-activity-completion] { padding:1.3rem; margin:1.5rem 0; border-left:4px solid #0084a5; background:#fff; border-radius:8px; }
.ld-activity [data-path-result] strong { display:block; margin-bottom:.6rem; }
.ld-activity [data-activity-progress],.ld-activity [data-review-progress] { color:#52616b; font-size:.9em; }
.ld-activity-card-grid,.ld-activity-review-grid,.ld-sort-destinations { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:1.1rem; }
.ld-activity details { border:1px solid #cdd5d9; border-radius:10px; background:#fff; padding:1rem; align-self:start; }
.ld-activity details summary { cursor:pointer; line-height:1.5; }
.ld-activity details summary > span { display:block; margin-top:.5rem; }
.ld-activity details summary p { margin:.4rem 0; }
.ld-activity span[data-reviewed] { color:#007f9e; font-size:.85em; font-weight:700; }
.ld-activity details[open] .ld-richtext { padding-top:1rem; }
.ld-activity-review-grid details { margin:.7rem 0; }
.ld-activity-highlight { display:flex; gap:.7rem; font-size:.9em; padding-top:.7rem; }
.ld-activity :is(button,input,select,summary):focus-visible { outline:3px solid #0084a5; outline-offset:4px; }
.ld-sort-destinations > div { border:2px dashed #a4bdc7; border-radius:10px; padding:1rem; min-height:140px; }
.ld-sort-card,.ld-rank-card { border:1px solid #cdd5d9; border-radius:10px; background:#fff; padding:1rem; margin:.8rem 0; overflow-wrap:break-word; }
.ld-sort-card[draggable=true],.ld-rank-card[draggable=true] { cursor:grab; }
.ld-sort-card select { width:100%; max-width:100%; font-size:.9em; }
.ld-sort-card [data-sort-feedback] { margin-top:1rem; font-size:.9em; }
.ld-sort-card [data-sort-feedback] strong { display:block; }
.ld-sort-card[data-correct] { border-color:#0084a5; }
.ld-rank-card > label { display:flex; gap:.8rem; align-items:baseline; }
.ld-rank-card [data-rank-position] { font-weight:700; color:#007f9e; }
.ld-rank-card [data-rank-moves] { display:flex; gap:1rem; margin-top:.6rem; }
.ld-rank-card [data-rank-moves] button { border:1px solid #0084a5; background:#fff; color:#007f9e; border-radius:6px; padding:.3rem .6rem; }
.ld-activity > button { margin:.4rem .5rem .4rem 0; }
@media(max-width:700px) { .ld-activity-card-grid,.ld-activity-review-grid,.ld-sort-destinations { grid-template-columns:1fr; } .ld-activity { padding:1rem; } }
.ld-path-image { max-width:700px; margin:1.5rem auto; }
.ld-path-image img { display:block; max-width:100%; height:auto; border-radius:10px; }
.ld-path-image figcaption { font-size:.85em; color:#52616b; margin-top:.5rem; }
/* Guided case hierarchy: activity title → case cards → interpretation. */
.ld-activity > h2 {font-size:clamp(1.5rem,2.5vw,2rem);line-height:1.25;margin:.8rem 0 1rem}
.ld-activity .ld-activity-intro {margin-bottom:1.5rem;max-width:75ch}
.ld-activity .ld-activity-intro p {margin:.65rem 0;font-size:.95rem;line-height:1.65}
.ld-activity .ld-activity-intro p:first-child {font-size:1.05rem;color:#4b5962}
.ld-activity .ld-path-step-heading {font-size:1.2rem;line-height:1.4;margin:1.5rem 0 1rem}
.ld-activity .ld-path-step-heading--redundant {position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.ld-activity-review-grid {align-items:start;margin:1.25rem 0}
.ld-activity .ld-review-card {background:white;border:1px solid #cdd5d9;border-radius:12px;padding:1.2rem;min-width:0}
.ld-activity .ld-review-card h4 {display:flex;align-items:center;gap:.65rem;font-size:1.1rem;font-weight:700;line-height:1.4;margin:0 0 1rem}
.ld-activity .ld-review-card--single> [data-review-opening]:empty {display:none}
.ld-activity .ld-review-card--single>details {border:0;border-radius:0;padding:0;margin:0;background:transparent}
.ld-activity .ld-review-card summary {display:flex;align-items:center;gap:.65rem;list-style:none;font-size:.95rem}
.ld-activity .ld-review-card summary::-webkit-details-marker {display:none}
.ld-activity .ld-review-card summary > span {margin:0}
.ld-activity .ld-review-summary-title {display:flex;align-items:center;gap:.65rem;min-width:0;font-weight:650}
.ld-activity .ld-review-card--single .ld-review-summary-title {font-size:1.1rem}
.ld-activity .ld-review-number {display:inline-flex;align-items:center;justify-content:center;flex:none;width:1.8rem;height:1.8rem;background:#e0f2f6;border-radius:50%;color:#006780;font-size:.85rem;font-weight:700}
.ld-activity .ld-review-state {margin-left:auto;font-size:.75rem!important;font-weight:600!important;color:#52616b!important;text-align:right}
.ld-activity [data-review-detail][data-reviewed] .ld-review-state {color:#146c40!important}
.ld-activity .ld-review-chevron {flex:none;width:8px;height:8px;border-right:2px solid #007f9e;border-bottom:2px solid #007f9e;transform:rotate(45deg);margin-left:.3rem}
.ld-activity details[open]>summary .ld-review-chevron {transform:rotate(225deg)}
.ld-activity .ld-review-card .ld-richtext {font-size:.95rem;line-height:1.7}
.ld-activity .ld-review-card details[open]>.ld-richtext {padding-top:1.1rem;margin-top:1rem;border-top:1px solid #e1e7ea}
.ld-activity .ld-review-facts {padding-left:1.2rem;margin:0}
.ld-activity .ld-review-facts li {padding-left:.25rem;margin:.5rem 0}
.ld-activity .ld-review-facts li::marker {color:#0084a5}
.ld-activity .ld-review-card.is-locked {background:#edf1f3;border-style:dashed}
.ld-activity .ld-review-card.is-locked summary {cursor:default}
.ld-activity .ld-review-card.is-locked .ld-review-number {background:#dfe6e9;color:#52616b}
.ld-activity .ld-review-card.is-locked .ld-review-chevron {visibility:hidden}
.ld-activity .ld-review-progress {font-size:.85rem;line-height:1.5;margin:1rem 0 1.5rem}
.ld-activity .ld-review-progress.is-ready {color:#146c40;font-weight:600}
.ld-activity [data-path-form] {margin-top:1.75rem;padding-top:1.5rem;border-top:1px solid #cdd5d9}
.ld-activity [data-path-form] fieldset {margin-top:0}
@media(max-width:700px){.ld-activity .ld-review-card{padding:1rem}.ld-activity .ld-review-card summary{flex-wrap:wrap}.ld-activity .ld-review-state{margin-left:2.45rem}.ld-activity .ld-review-chevron{margin-left:auto}}
.ld-activity .ld-review-card summary > .ld-review-state {margin-left:auto}
@media(max-width:700px){.ld-activity .ld-review-card summary > .ld-review-state{margin-left:2.45rem}}
/* Shared visual language for all lesson practice activities. */
.ld-activity .ld-review-state:empty {display:none}
.ld-activity .ld-interactive-label {display:inline-block;margin:0 0 .4rem;padding:.3rem .65rem;border-radius:6px;font-size:.72rem;line-height:1.4;letter-spacing:.09em;font-weight:700;background:#dff2f6;color:#006780}
.learnderm-classic .ld-practice.ld-activity>h2 {font-size:clamp(1.5rem,2.5vw,2rem);line-height:1.25;margin:.8rem 0 1rem}
.ld-activity .ld-path-context:empty {display:none}
.ld-activity .ld-path-context:not(:empty) {padding:1.1rem 1.3rem;margin:1rem 0 1.5rem;background:#fff;border:1px solid #d6dfe3;border-radius:10px;font-size:1rem;line-height:1.7}
.ld-activity .ld-path-context>:last-child {margin-bottom:0}
.ld-activity [data-activity-progress]:not([hidden]) {display:table;padding:.4rem .75rem;border-radius:6px;background:#e8eff2;color:#4b5962;font-size:.8rem;font-weight:600;margin:1rem 0 1.5rem}
.ld-activity [data-path-step]>button {margin:.5rem .6rem .5rem 0}
.ld-activity .ld-practice-option {font-size:1rem;line-height:1.6;padding:1rem 1.1rem;cursor:pointer}
.ld-activity .ld-practice-option input {flex:none;transform:translateY(.08rem)}
.ld-activity .ld-practice-option.is-correct {border-color:#16804a;background:#f0faf4}
.ld-activity .ld-practice-option.is-incorrect {border-color:#b42318;background:#fff4f2}
.ld-activity [data-path-result].is-correct,.ld-activity .ld-practice-result.is-correct {border-left:4px solid #16804a;background:#f0faf4}
.ld-activity [data-path-result].is-incorrect,.ld-activity .ld-practice-result.is-incorrect {border-left:4px solid #b42318;background:#fff4f2}
.ld-activity .ld-practice-result:empty {display:none}
.ld-activity .ld-practice-result:not(:empty) {padding:1.2rem;border-radius:8px;margin-top:1.3rem;font-size:1rem;line-height:1.7}
.ld-activity .ld-practice-result>strong {display:block;margin-bottom:.6rem}
.ld-activity [data-path-transcript]>div {border:1px solid #d6dfe3;background:#fff;border-radius:10px;padding:1rem 1.2rem;margin:.9rem 0}
.ld-activity [data-path-transcript] h4 {font-size:1rem;font-weight:700;margin:0 0 .7rem;line-height:1.4}
.ld-activity [data-path-transcript] p:last-child {margin-bottom:0}
.ld-activity .ld-reveal-card {padding:1.2rem;border-radius:12px;overflow-wrap:break-word}
.ld-activity .ld-reveal-card>summary {list-style:none}
.ld-activity .ld-reveal-card>summary::-webkit-details-marker {display:none}
.ld-activity .ld-reveal-card>summary>span {margin:0}
.ld-activity .ld-reveal-card>summary>.ld-reveal-card-heading {display:flex;align-items:center;gap:.65rem;line-height:1.4;font-size:1rem}
.ld-activity .ld-reveal-card-heading strong {flex:1;font-weight:700}
.ld-activity .ld-reveal-card-heading .ld-review-chevron {margin-left:auto}
.ld-activity .ld-reveal-card[open] .ld-review-chevron {transform:rotate(225deg)}
.ld-activity .ld-reveal-card>summary>.ld-reveal-preview {font-size:.95rem;line-height:1.6;color:#52616b;margin:.8rem 0 0}
.ld-activity .ld-reveal-preview p:last-child {margin-bottom:0}
.ld-activity .ld-reveal-card .ld-review-state {font-size:.75rem!important;text-align:left;margin-top:.7rem}
.ld-activity .ld-reveal-card>.ld-richtext {font-size:.95rem;line-height:1.7;padding-top:1.1rem;margin-top:1.1rem;border-top:1px solid #e1e7ea}
.ld-activity .ld-reveal-card>.ld-richtext>:last-child {margin-bottom:0}
.ld-activity .ld-activity-panel-title {display:flex;align-items:center;gap:.7rem;font-size:1.05rem;line-height:1.45;font-weight:700;margin:0 0 1rem}
.ld-sort-workspace,.ld-rank-workspace {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.2rem;margin:1.5rem 0;align-items:start}
.ld-sort-bank-panel,.ld-rank-bank-panel,.ld-rank-selected-panel {padding:1.2rem;border:1px solid #d6dfe3;border-radius:12px;background:#fff;min-width:0}
.ld-activity .ld-sort-destinations {grid-template-columns:1fr;align-content:start}
.ld-activity .ld-sort-destinations>div {background:#edf5f8;border-color:#a6c6d2;border-radius:12px;padding:1.2rem;min-width:0;min-height:150px}
.ld-activity .ld-sort-card {font-size:.95rem;line-height:1.6;padding:1rem;border-radius:10px}
.ld-activity .ld-sort-card>p {font-weight:600;margin:0 0 .85rem}
.ld-activity .ld-sort-card label {display:block;font-size:.8rem;color:#52616b}
.ld-activity .ld-sort-card select {display:block;margin-top:.4rem;padding:.5rem;font:inherit;background:white;border:1px solid #bdccd3;border-radius:6px;color:#303c46;min-height:40px}
.ld-activity .ld-sort-card[data-correct] {border-color:#16804a;background:#f0faf4}
.ld-activity .ld-sort-card [data-sort-feedback] {font-size:.85rem;line-height:1.6;padding-top:.8rem;border-top:1px solid #d6dfe3}
.ld-activity .ld-sort-card [data-sort-feedback].is-incorrect>strong {color:#912018}
.ld-activity .ld-sort-card [data-sort-feedback].is-correct>strong {color:#146c40}
.ld-activity .ld-activity-empty,[data-rank-selected]:empty::before {font-size:.9rem;line-height:1.6;color:#62727c;padding:1rem;border:1px dashed #bdccd3;border-radius:8px;display:block}
.ld-activity [data-rank-selected]:empty::before {content:attr(data-empty-label)}
.ld-activity .ld-rank-card {padding:.9rem 1rem;font-size:.95rem;line-height:1.5}
.ld-activity .ld-rank-card:first-child {margin-top:0}
.ld-activity .ld-rank-card:last-child {margin-bottom:0}
.ld-activity .ld-rank-card.is-selected {border-color:#0084a5;background:#f1fafc}
.ld-activity .ld-rank-card label {cursor:pointer;font-weight:600}
.ld-activity .ld-rank-card [data-rank-position]:not(:empty) {display:inline-block;margin-top:.7rem;font-size:.75rem;padding:.2rem .6rem;background:#dff2f6;border-radius:999px;color:#006780}
.ld-activity .ld-rank-card [data-rank-moves] {gap:.5rem;flex-wrap:wrap;margin-top:.65rem}
.ld-activity .ld-rank-card [data-rank-moves] button {font-size:.8rem;padding:.35rem .6rem;line-height:1.4;min-height:36px}
.ld-activity .ld-followup-card {padding:1rem 1.2rem;border:1px solid #d6dfe3;border-radius:10px;background:white;margin-bottom:1rem}
.ld-activity .ld-followup-card h4 {font-size:1.05rem;line-height:1.4;font-weight:700;margin:0 0 .7rem}
.ld-activity .ld-followup-card p:last-child {margin-bottom:0}
.ld-illustrated-tabs.ld-activity .ld-illustrated-tabs-nav {gap:.4rem;border:0;padding:.4rem;background:#e5edf1;border-radius:10px;margin:1.4rem 0}
.ld-illustrated-tabs.ld-activity .ld-illustrated-tabs-nav button {flex:1;padding:.7rem 1rem;border:0;border-radius:7px;font-size:1rem;line-height:1.4;font-weight:650;cursor:pointer}
.ld-illustrated-tabs.ld-activity .ld-illustrated-tabs-nav button[aria-selected=true] {background:#006780;color:#fff}
.ld-activity .ld-illustrated-tab-body {border:1px solid #d6dfe3;border-radius:10px;padding:1.2rem;font-size:1rem;line-height:1.7}
.ld-activity .ld-illustrated-tab-body :is(h3,h4) {font-size:1.15rem;line-height:1.4;margin:0 0 1rem}
@media(max-width:700px){.ld-sort-workspace,.ld-rank-workspace{grid-template-columns:1fr}.ld-sort-bank-panel,.ld-rank-bank-panel,.ld-rank-selected-panel,.ld-activity .ld-sort-destinations>div,.ld-activity .ld-reveal-card{padding:1rem}.ld-activity .ld-path-context:not(:empty){padding:1rem}.ld-activity .ld-activity-panel-title{font-size:1rem}}

/* Matching dashed outlines connect movable scenarios with their destinations. */
.ld-activity .ld-sort-card[draggable="true"] {border:2px dashed #a6c6d2;transition:border-color .16s ease,background-color .16s ease,box-shadow .16s ease}
.ld-activity .ld-sort-card[draggable="true"]:hover {border-color:#0084a5}
.ld-activity .ld-sort-card.is-dragging {opacity:.6;cursor:grabbing}
.ld-activity [data-sort-zone] {transition:border-color .16s ease,background-color .16s ease,box-shadow .16s ease}
.ld-activity [data-sort-zone].is-drag-over {border-style:solid;border-color:#0084a5;background:#d5f2f7;box-shadow:0 0 0 3px rgb(0 132 165 / 18%)}
.ld-activity .ld-sort-card[data-correct] {border:2px solid #16804a}
@media(prefers-reduced-motion:reduce){.ld-activity .ld-sort-card,.ld-activity [data-sort-zone]{transition:none}}