/* Activity Corner: one clear choice at a time, with the existing preview dialogs. */
.activity-browser { max-width: 1100px; width: calc(100% - 56px); padding: 36px 0 50px; }
.activity-browser [hidden] { display: none !important; }
.activity-browser .activity-heading-row { margin-bottom: 30px; gap: 18px; }
.activity-browser .activity-page-title { font-size: clamp(32px, 4vw, 44px); margin: 8px 0 10px; }
.activity-browser .activity-intro { font-size: 16px; color: #52654d; }
.activity-browser .activity-heading-row .eyebrow { font-size: 10px; margin: 0; }
.activity-welcome-art { width: 95px; padding: 13px; border-radius: 26px; background: #edf2e6; transform: rotate(6deg); }
.activity-welcome-art svg { display: block; width: 100%; }
.activity-level-picker { padding: 20px; margin-bottom: 28px; background: #edf2e6; border-radius: 20px; }
.activity-level-picker h2 { font-size: 21px; margin: 0 0 13px; }
.activity-levels { display: flex; flex-wrap: wrap; gap: 9px; }
.activity-levels button { min-height: 48px; padding: 10px 17px; border: 1px solid #bdcdb2; border-radius: 13px; background: #fffefb; color: #286744; font: 800 15px var(--font); }
.activity-level-name { display: block; white-space: nowrap; }
.activity-level-age { display: block; margin-top: 4px; font-size: 12px; font-weight: 600; font-style: italic; line-height: 1.4; }
.activity-levels button:hover { border-color: #286744; }
.activity-levels button[aria-pressed="true"] { background: #286744; color: white; border-color: #286744; }
.activity-level-picker p { color: #52654d; font-size: 12px; line-height: 1.6; margin: 12px 0 0; }
.activity-level-picker .activity-level-guidance { margin: 0 0 13px; }
.activity-level-picker .activity-level-summary { font-weight: 800; margin-top: 5px; }
.activity-chooser > h2 { font-size: 25px; margin: 0 0 23px; }
.activity-browser .activity-learning-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 17px; }
.activity-browser .activity-learning-grid .activity-topic-card { position: relative; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 9px; padding: 20px 13px; min-height: 185px; border-radius: 22px; border-width: 2px; border-color: transparent; }
.activity-browser .activity-learning-grid .activity-topic-card:hover { border-color: #6b9361; box-shadow: 0 5px 16px #314d3110; }
.activity-browser .activity-learning-grid .activity-topic-art { width: 64px; }
.activity-browser .activity-learning-grid .activity-topic-card strong { font-size: 23px; line-height: 1.25; }
.activity-browser .activity-learning-grid .activity-topic-card small { font-size: 12px; line-height: 1.5; color: #435c45; margin-top: 7px; }
.activity-browser .activity-topic-arrow { position: absolute; right: 15px; top: 13px; margin: 0; font-size: 18px; opacity: .7; }
.activity-browse-all { display: flex; align-items: center; justify-content: center; gap: 18px; margin: 23px auto 0; padding: 12px 22px; min-height: 48px; border: 1px solid #c2d0b9; border-radius: 14px; background: #fffefb; color: #286744; font: 800 15px var(--font); }
.activity-browse-all:hover { background: #edf3e5; }
.activity-start-note { font-size: 13px; text-align: center; color: #52654d; margin: 17px 0 0; }
.activity-back { display: inline-flex; gap: 10px; align-items: center; min-height: 48px; padding: 9px 16px; border: 1px solid #c7d3c0; border-radius: 13px; background: #fffefb; color: #286744; font: 800 15px var(--font); margin-bottom: 23px; }
.activity-back:hover { background: #edf3e5; }
.activity-selected-heading { display: flex; gap: 18px; align-items: center; margin-bottom: 25px; }
.activity-selected-art { display: block; width: 74px; padding: 12px; border-radius: 19px; flex-shrink: 0; }
.activity-selected-art svg { width: 100%; display: block; }
.activity-browser .activity-library-heading { font-size: 32px; margin: 0 0 7px; scroll-margin-top: 105px; }
.activity-browser .activity-section-description { margin: 0; font-size: 15px; }
.activity-groups { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.activity-group { display: flex; align-items: center; gap: 12px; min-height: 73px; padding: 12px 15px; border: 1px solid #d5dfcd; border-radius: 15px; background: #fffefb; color: #3c5945; font: 800 14px var(--font); text-align: left; }
.activity-group-symbol { display: grid; place-items: center; min-width: 38px; height: 38px; border-radius: 10px; background: #edf2e5; color: #286744; font-size: 20px; }
.activity-group small { display: block; margin-top: 2px; font-size: 11px; font-weight: 700; }
.activity-group:hover { border-color: #719568; }
.activity-group.is-active { color: #fff; background: #286744; border-color: #286744; box-shadow: 0 3px 0 #1d493017; }
.activity-group.is-active .activity-group-symbol { background: #fffdf7; color: #286744; }
.activity-results-toolbar { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: 12px; margin: 0 0 22px; }
.activity-browser .activity-count { display: block; color: #52654d; font-size: 13px; line-height: 1.65; padding: 11px 0; margin: 0; white-space: normal; }
.activity-refine { max-width: 100%; font-size: 13px; }
.activity-refine summary { padding: 10px 12px; min-height: 44px; color: #426349; cursor: pointer; border: 1px solid #d8e1d1; border-radius: 11px; background: #f7f8f0; font-weight: 800; }
.activity-browser .activity-topic-controls { display: flex; gap: 10px; align-items: end; margin: 12px 0 0; padding: 14px; border-radius: 13px; background: #eef3e6; }
.activity-browser .activity-topic-controls label { width: auto; font-size: 12px; }
.activity-browser .activity-topic-controls select { min-width: 210px; font-size: 13px; }
.activity-browser .activity-reset { font-family: var(--font); font-size: 12px; }
.activity-results-heading { font-size: 22px; margin: 0 0 8px; scroll-margin-top: 105px; }
.activity-results-hint { font-size: 13px; color: #52654d; margin: 0 0 20px; }
.activity-browser .activity-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.activity-browser .activity-card { border-radius: 20px; transition: none; }
.activity-browser .activity-card:hover { transform: none; box-shadow: 0 5px 18px #314d3110; }
.activity-open-card { display: flex; flex-direction: column; flex: 1; width: 100%; padding: 0; border: 0; text-align: left; background: #fffefb; color: #233d35; font: inherit; }
.activity-open-card:hover .activity-card-action { color: #174c2e; }
.activity-browser .activity-preview { height: 191px; padding: 15px 12px 0; align-items: flex-start; flex-shrink: 0; }
.activity-browser .activity-sheet { width: 130px; transform: none; }
.activity-browser .activity-card:nth-child(even) .activity-sheet,
.activity-browser .activity-preview:hover .activity-sheet { transform: none; }
.activity-browser .activity-card-copy { width: 100%; min-width: 0; padding: 19px 21px 16px; }
.activity-browser .activity-card-label { font-size: 11px; font-weight: 800; color: #52654d; text-transform: none; letter-spacing: 0; margin: 0 0 5px; }
.activity-card-title { font-size: 20px; font-weight: 800; line-height: 1.35; margin: 0 0 10px; }
.activity-browser .activity-card .activity-card-description { font-size: 13px; line-height: 1.65; margin: 0 0 17px; color: #52654d; }
.activity-card-action { display: flex; justify-content: space-between; gap: 10px; margin-top: auto; padding-top: 13px; border-top: 1px solid #e4eadd; font-size: 14px; font-weight: 800; color: #286744; }
.activity-card-action > span { font-size: 20px; line-height: 1; }
.activity-pagination { display: flex; align-items: center; justify-content: center; gap: 25px; margin: 28px 0 10px; }
.activity-pagination button { border: 1px solid #c2d1b8; border-radius: 13px; background: #eef3e5; color: #286744; min-height: 49px; padding: 11px 21px; font: 800 15px var(--font); }
.activity-pagination button:disabled { opacity: .45; }
.activity-page-status { color: #52654d; font-size: 13px; font-weight: 800; }
.activity-browser .activity-empty { padding: 30px; }
.activity-browser .activity-empty .btn { margin-top: 18px; }
.activity-print-tools { margin-top: 34px; border-top: 1px solid #dfe5d7; padding-top: 15px; }
.activity-print-tools > summary { display: flex; gap: 12px; align-items: center; min-height: 50px; color: #52654d; font-size: 14px; font-weight: 800; cursor: pointer; }
.activity-print-tools > summary::after { content: '+'; font-size: 22px; margin-left: auto; }
.activity-print-tools[open] > summary::after { content: '−'; }
.activity-print-tools-body { padding: 17px; border-radius: 17px; background: #f1f4e8; }
.activity-print-tools-body > p { font-size: 13px; color: #52654d; line-height: 1.7; }
.activity-pack-buttons { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 16px 0; }
.activity-browser .activity-tracing-pack { padding: 14px; gap: 10px; }
.activity-browser .activity-tracing-pack .tracing-pack-symbol { flex-basis: 40px; height: 44px; font-size: 20px; }
.activity-browser .activity-tracing-pack strong { font-size: 14px; }
.activity-browser .activity-tracing-pack small { font-size: 12px; }
.activity-browser .comprehension-section { margin-top: 0; }
.activity-browser button:focus-visible, .activity-browser summary:focus-visible { outline: 3px solid #3768b6; outline-offset: 4px; }
.activity-open-card:focus-visible { outline-offset: -4px !important; }
.activity-library-heading:focus, .activity-results-heading:focus { outline: none; }
.activity-browser.is-browsing .activity-heading-row { margin-bottom: 23px; }
.activity-browser.is-browsing .activity-welcome-art { display: none; }
.activity-browser.is-browsing .activity-heading-row .eyebrow,
.activity-browser.is-browsing .activity-intro { display: none; }
.activity-browser.is-browsing .activity-page-title { font-size: 27px; margin: 0; }
@media (max-width: 850px) {
  .activity-browser .activity-learning-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .activity-browser .activity-learning-grid .activity-topic-card { min-height: 161px; }
  .activity-browser .activity-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 17px; }
  .activity-pack-buttons { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
  .activity-level-picker { padding: 16px; }
  .activity-levels { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .activity-levels button { font-size: 13px; padding: 10px 7px; }
  .activity-browser { width: calc(100% - 32px); padding: 26px 0 36px; }
  .activity-browser .activity-heading-row { margin-bottom: 25px; }
  .activity-welcome-art { display: none; }
  .activity-browser .activity-intro { font-size: 14px; }
  .activity-chooser > h2 { font-size: 22px; margin-bottom: 18px; }
  .activity-browser .activity-learning-grid { gap: 12px; }
  .activity-browser .activity-learning-grid .activity-topic-card { min-height: 160px; padding: 15px 9px; }
  .activity-browser .activity-learning-grid .activity-topic-art { width: 53px; }
  .activity-browser .activity-learning-grid .activity-topic-card strong { font-size: 21px; }
  .activity-browser .activity-learning-grid .activity-topic-card small { font-size: 12px; }
  .activity-browser .activity-topic-arrow { top: 9px; right: 11px; font-size: 15px; }
  .activity-start-note { max-width: 270px; margin-inline: auto; font-size: 12px; }
  .activity-selected-heading { gap: 12px; }
  .activity-selected-art { width: 59px; padding: 10px; }
  .activity-browser .activity-library-heading { font-size: 27px; }
  .activity-browser .activity-section-description { font-size: 13px; }
  .activity-groups { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
  .activity-group { gap: 8px; min-height: 75px; padding: 10px; font-size: 13px; }
  .activity-group-symbol { min-width: 30px; height: 34px; font-size: 17px; }
  .activity-group small { font-size: 10px; }
  .activity-results-toolbar { gap: 5px; }
  .activity-browser .activity-count { font-size: 12px; }
  .activity-refine { width: 100%; }
  .activity-refine summary { display: list-item; width: fit-content; font-size: 12px; }
  .activity-browser .activity-topic-controls { flex-wrap: wrap; }
  .activity-browser .activity-topic-controls label { width: 100%; }
  .activity-browser .activity-topic-controls select { width: 100%; min-width: 0; }
  .activity-browser .activity-grid { grid-template-columns: 1fr; gap: 13px; }
  .activity-open-card { flex-direction: row; }
  .activity-browser .activity-preview { width: 36%; min-width: 93px; height: auto; min-height: 164px; padding: 13px 8px 0; }
  .activity-browser .activity-sheet { width: 100%; max-width: 111px; }
  .activity-browser .activity-card-copy { padding: 16px 15px 14px; }
  .activity-card-title { font-size: 18px; margin-bottom: 12px; }
  .activity-browser .activity-card .activity-card-description { display: none; }
  .activity-card-action { font-size: 13px; padding-top: 11px; }
  .activity-pagination { gap: 12px; margin-top: 23px; }
  .activity-pagination button { font-size: 13px; padding: 10px 13px; }
  .activity-page-status { font-size: 12px; white-space: nowrap; }
  .activity-print-tools > summary { font-size: 13px; }
}