/* Extends the site's original violet palette, 14px radii, system fonts and sidebar. */
.academic-page { max-width:1350px; margin:auto; }
.ac-breadcrumb {color:var(--text-2);font-size:13px;margin-bottom:18px}
.ac-breadcrumb button,.ac-link {border:0;background:none;color:var(--primary);padding:0;font-size:13px}
.ac-title-row,.ac-section-head,.ac-pagination,.ac-study-meta,.ac-study-foot{display:flex;justify-content:space-between;align-items:center;gap:16px}
.ac-title-row{margin-bottom:24px}.ac-title-row .btn-ghost{width:auto;white-space:nowrap}.ac-title-row .page-desc{margin-top:5px}
.ac-levels{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px;margin-bottom:20px}
.ac-level{display:flex;flex-direction:column;align-items:flex-start;gap:4px;padding:19px 16px 14px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);text-align:left;transition:border-color .15s,transform .15s;min-width:0}
.ac-level:hover{border-color:var(--primary);transform:translateY(-2px)}.ac-level.selected{background:var(--primary-soft);border:2px solid var(--primary);padding:18px 15px 13px;color:var(--primary)}
.ac-level b{font-size:27px;line-height:1.3}.ac-level span{font-size:15px;font-weight:600}.ac-level small{font-size:11px;color:var(--text-2);margin-top:8px;white-space:normal}
.ac-mini-progress{height:3px;background:var(--border);border-radius:4px;width:100%;margin-top:6px;overflow:hidden}.ac-mini-progress i{display:block;height:100%;background:var(--primary)}
.ac-summary{display:grid;grid-template-columns:repeat(5,1fr);padding:20px 0;margin-bottom:26px;background:white;border:1px solid var(--border);border-radius:var(--radius)}
.ac-summary>div{padding:0 22px;border-right:1px solid var(--border)}.ac-summary>div:last-child{border:0}.ac-summary small{display:block;color:var(--text-2);font-size:12px}.ac-summary b{display:block;font-size:26px;margin-top:3px}.ac-summary em{font-style:normal;font-size:13px;color:var(--text-3);font-weight:400}
.ac-purple{color:var(--primary)}.ac-green{color:var(--green)}.ac-muted{color:var(--text-2);font-size:12px}.ac-section-head{margin-bottom:16px}.ac-tabs{display:flex;background:var(--border);padding:4px;border-radius:10px;gap:3px}.ac-tabs button{border:0;padding:9px 18px;color:var(--text-2);background:none;border-radius:8px}.ac-tabs .active{background:white;color:var(--primary);font-weight:600;box-shadow:0 1px 5px #2221}
.ac-toolbar{display:flex;align-items:center;gap:12px;margin:18px 0}.ac-toolbar form{display:flex;gap:8px;flex:1}.ac-toolbar input{width:100%}.ac-toolbar label{display:flex;align-items:center;gap:8px;white-space:nowrap;color:var(--text-2);font-size:13px}.ac-toolbar select{width:110px}.ac-toolbar .btn-primary,.ac-toolbar .btn-ghost{width:auto;white-space:nowrap}.ac-toolbar .input{margin:0}
.ac-table-wrap{overflow:auto;border:1px solid var(--border);border-radius:var(--radius);background:white}.ac-table{border-collapse:collapse;width:100%;font-size:13px;text-align:left}.ac-table th{color:var(--text-2);font-weight:500;background:var(--surface-2);padding:13px 18px;white-space:nowrap}.ac-table td{padding:16px 18px;border-top:1px solid var(--border);vertical-align:middle}.ac-table .btn-ghost{width:auto;font-size:12px;white-space:nowrap;padding:7px 11px}.ac-table th:first-child{width:24%}.ac-wordline{display:flex;align-items:center;gap:10px}.ac-wordline b{font-size:18px;letter-spacing:.2px}.ac-ipa{color:var(--text-2);font-family:Arial,sans-serif}.ac-coll{font-size:12px;margin-top:7px;color:var(--text-2)}.ac-coll span{color:var(--text-3)}
.ac-audio{border:0;border-radius:50%;background:var(--primary-soft);font-size:14px;width:30px;height:30px;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center}.ac-audio:hover{background:#dfe2ff}.ac-audio[aria-busy]{opacity:.5}
.ac-status{white-space:nowrap;display:inline-block;border-radius:20px;font-size:11px;background:var(--primary-soft);color:var(--primary);padding:4px 10px}.ac-status.mastered{background:var(--green-soft);color:var(--green)}.ac-status.new{background:#f1f3f7;color:var(--text-2)}.ac-due{display:block;color:var(--text-3);white-space:nowrap;margin-top:4px;font-size:11px}
.ac-pagination{margin-top:16px;font-size:12px;color:var(--text-2)}.ac-pagination>div{display:flex;gap:8px}.ac-pagination button{width:auto;font-size:12px}.academic-page button:disabled{opacity:.45;cursor:not-allowed}.ac-footer{font-size:12px;color:var(--text-3);margin:24px 0 10px}.ac-empty{padding:65px 20px;text-align:center;border:1px solid var(--border);background:white;border-radius:var(--radius);color:var(--text-2)}.ac-empty h2{color:var(--text);font-size:20px}.ac-empty p{margin:12px 0 22px}.ac-empty .btn-primary,.ac-empty .btn-ghost{width:auto;margin:5px}.ac-empty-icon{font-size:40px;color:var(--green);margin-bottom:15px}
.ac-study{max-width:720px;margin:24px auto}.ac-study-meta{font-size:12px;color:var(--text-2);margin-bottom:12px}.ac-flashcard{position:relative;min-height:350px;text-align:center;background:white;border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);padding:48px 40px 30px;outline-offset:4px}.ac-flashcard h1{font-size:44px;line-height:1.2;font-weight:700;letter-spacing:-1px;overflow-wrap:anywhere}.ac-card-level{position:absolute;right:22px;top:20px;background:var(--primary-soft);color:var(--primary);border-radius:7px;padding:3px 9px;font-size:12px;font-weight:600}.ac-card-pron{display:flex;justify-content:center;align-items:center;gap:12px;margin-top:15px;color:var(--text-2);font-family:Arial,sans-serif;font-size:18px}.ac-card-pron .ac-audio{width:38px;height:38px;font-size:18px}.ac-recall{padding-top:43px}.ac-recall p{font-size:13px;color:var(--text-3);margin-bottom:22px}.ac-recall .btn-primary{width:auto;min-width:210px}.ac-recall small{font-size:10px;opacity:.65;margin-left:20px}
.ac-answer{margin-top:27px;padding-top:23px;border-top:1px solid var(--border);text-align:left}.ac-answer h2{font-size:21px;font-weight:600;text-align:center;margin-bottom:22px}.ac-context{background:var(--primary-soft);border-radius:10px;padding:16px 20px;border-left:3px solid var(--primary)}.ac-context b{font-size:17px;font-weight:500;color:var(--primary)}.ac-context p{font-size:13px;margin-top:5px;color:var(--text-2)}.ac-context small{font-size:10px;color:var(--text-3)}.ac-syn{margin-top:18px;color:var(--text-2);font-size:13px}.ac-answer details{margin-top:18px;color:var(--text-2);font-size:12px}.ac-answer summary{cursor:pointer}.ac-source-quote{padding:12px 0;line-height:1.8}.ac-ratings{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}.ac-ratings button{border:1px solid transparent;border-radius:11px;padding:13px 8px}.ac-ratings b{display:block;font-weight:600}.ac-ratings small{display:block;margin-top:3px;font-size:12px}.ac-ratings .again{background:var(--red-soft);border-color:#f6c6c6;color:var(--red)}.ac-ratings .hard{background:var(--amber-soft);border-color:#f1d6a9;color:var(--amber)}.ac-ratings .good{background:var(--primary-soft);border-color:#d6d4fd;color:var(--primary)}
.ac-master{width:100%;margin-top:14px;padding:13px;border:1px solid #a9d8ba;color:var(--green);background:white;border-radius:10px;font-size:14px;font-weight:600}.ac-master:hover{background:var(--green-soft)}.ac-study-foot{margin-top:16px;font-size:11px;color:var(--text-3)}.ac-setting-label{display:flex;align-items:center;gap:12px;margin:22px 0}.ac-setting-label .input{width:100px;margin:0}.ac-setting-label input[type=checkbox]{width:18px;height:18px;accent-color:var(--primary)}
.ac-actions{display:flex;align-items:center;gap:10px}.ac-actions .input{margin:0;width:140px}.ac-demo{padding:12px 18px;background:var(--amber-soft);color:#8a590e;border-radius:10px;margin-bottom:20px;font-size:12px}.ac-panel{padding:22px;background:white;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:20px}.ac-panel h3{font-size:15px;margin-bottom:10px}.ac-kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.ac-kpis .ac-panel{display:flex;flex-direction:column;gap:4px}.ac-kpis span{font-size:12px;color:var(--text-2)}.ac-kpis b{font-size:30px;letter-spacing:-1px}.ac-kpis small{font-size:11px;color:var(--text-3)}.ac-chart{display:flex;align-items:end;gap:4px;height:154px;padding-top:12px;overflow:hidden}.ac-bar-col{flex:1;min-width:1px;display:flex;flex-direction:column;align-items:center;justify-content:end;height:100%;font-size:10px;color:var(--text-3)}.ac-bar-col i{display:block;background:var(--primary-2);width:70%;max-width:30px;border-radius:4px 4px 0 0;min-height:1px}.ac-bar-col span{font-size:10px;margin-bottom:4px}.ac-bar-col small{font-size:9px;margin-top:7px;white-space:nowrap;transform:rotate(-40deg);height:22px;transform-origin:center}.ac-retention{display:grid;grid-template-columns:repeat(3,1fr);margin-top:20px}.ac-retention>div{display:flex;flex-direction:column;padding:10px 22px;border-left:1px solid var(--border)}.ac-retention>div:first-child{border:0;padding-left:0}.ac-retention span{font-size:13px;color:var(--text-2)}.ac-retention strong{font-size:30px;margin:8px 0;color:var(--primary)}.ac-retention small,.ac-conversions small{font-size:11px;color:var(--text-3)}.ac-conversions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.ac-conversions strong{font-size:30px;color:var(--primary)}.ac-conversions p{margin:8px 0;font-size:13px;color:var(--text-2)}.ac-panel .ac-table td{padding:12px 10px}.ac-panel .ac-table th{padding:12px 10px}
.academic-page button:focus-visible,.academic-page select:focus-visible,.academic-page input:focus-visible{outline:2px solid var(--primary);outline-offset:3px}
@media(max-width:1000px){.ac-levels{grid-template-columns:repeat(3,1fr)}.ac-summary>div{padding:0 12px}.ac-toolbar{flex-wrap:wrap}.ac-toolbar form{min-width:220px}.ac-kpis{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.ac-title-row{align-items:flex-start}.ac-title-row .page-title{font-size:21px}.ac-title-row .btn-ghost{padding:6px 10px;font-size:12px}.ac-levels{gap:8px}.ac-level{padding:12px}.ac-level.selected{padding:11px}.ac-level b{font-size:23px}.ac-level small{font-size:10px}.ac-summary{grid-template-columns:repeat(4,1fr);padding:15px 0}.ac-summary b{font-size:22px}.ac-summary .ac-goal{grid-column:1/-1;border-top:1px solid var(--border);margin-top:15px;padding:12px 14px 0;display:flex;justify-content:space-between;align-items:center}.ac-summary .ac-goal b{font-size:18px;margin:0}.ac-summary>div:nth-child(4){border:0}.ac-section-head{align-items:flex-start;flex-wrap:wrap}.ac-tabs button{padding:8px 14px}.ac-toolbar form{flex-basis:100%}.ac-toolbar .btn-primary{flex:1}.ac-table th,.ac-table td{padding:12px}.ac-table td:first-child{min-width:155px}.ac-table td:nth-child(2){min-width:220px}.ac-table td:nth-child(3){min-width:85px}.ac-wordline b{font-size:16px}.ac-pagination{flex-wrap:wrap}.ac-flashcard{padding:54px 20px 24px;min-height:330px}.ac-flashcard h1{font-size:36px}.ac-answer h2{font-size:19px}.ac-study-foot{gap:8px;flex-wrap:wrap}.ac-ratings{gap:7px}.ac-conversions{grid-template-columns:1fr;gap:0}.ac-kpis{gap:10px}.ac-kpis .ac-panel{padding:16px}.ac-panel{padding:18px}.ac-retention>div{padding:8px 12px}.ac-retention strong{font-size:25px}.ac-actions{flex-wrap:wrap;justify-content:end}.ac-actions .input{width:115px}.ac-chart{gap:2px}.ac-bar-col small{display:none}}
/* Level guidance and independent spelling practice. */
.ac-guide{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);margin:-5px 0 20px}
.ac-guide>summary{cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 18px;list-style:none}.ac-guide>summary::-webkit-details-marker{display:none}.ac-guide summary b{display:block;font-size:14px}.ac-guide summary small{display:block;font-size:12px;color:var(--text-2);margin-top:4px}.ac-guide-toggle{color:var(--primary);font-size:12px;white-space:nowrap}.ac-guide-content{padding:0 18px 14px}.ac-guide-content p{font-size:12px;line-height:1.8;margin-top:12px}.ac-guide-content a{color:var(--primary)}.ac-guide .ac-table td{padding:12px 16px}.ac-guide .ac-table td:first-child{white-space:nowrap}.ac-guide .ac-table th:first-child{width:17%}.ac-guide .ac-table td:nth-child(2){white-space:nowrap}.ac-level-tag{font-style:normal;font-size:11px;color:var(--text-2)}.ac-level-tip{font-size:12px;line-height:1.7;color:var(--text-2);margin:-6px 0 16px}.ac-level-tip b{color:var(--primary);margin-right:8px}.ac-tabs small{background:var(--primary-soft);border-radius:4px;padding:1px 5px;font-size:10px}
.ac-bulk{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;background:var(--primary-soft);border:1px solid #dedcfa;border-radius:var(--radius);padding:14px 16px;margin-bottom:12px}.ac-bulk-selection,.ac-bulk-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.ac-bulk-selection{font-size:12px}.ac-bulk-selection label{display:flex;gap:8px;align-items:center;white-space:nowrap}.ac-bulk small{flex-basis:100%;font-size:11px;color:var(--text-2);display:flex;gap:16px;flex-wrap:wrap}.ac-bulk-actions button{width:auto;font-size:12px;padding:9px 12px}.ac-bulk input[type=checkbox],.ac-select-cell input{width:17px;height:17px;accent-color:var(--primary);cursor:pointer}.ac-word-table th.ac-select-cell,.ac-word-table td.ac-select-cell{width:48px;min-width:48px;text-align:center;padding:14px 12px}.ac-word-table th:nth-child(2){width:23%}.ac-word-table .ac-selected-row{background:#f8f7ff}.ac-spelling-badge{display:block;margin-top:6px;color:var(--primary);font-size:11px;white-space:nowrap}.ac-spell-meaning{font-size:23px;line-height:1.5;margin:24px 0 12px}.ac-spell-audio{width:auto;margin-bottom:20px}.ac-spelling form{max-width:390px;margin:0 auto}.ac-spelling form label{display:block;text-align:left}.ac-spelling #acSpellInput{font-size:23px;letter-spacing:.5px;text-align:center;margin:8px 0 18px}.ac-spelling .btn-primary{width:auto;min-width:150px}.ac-spelling form .btn-ghost{margin:10px;width:auto}.ac-spell-feedback{border-top:1px solid var(--border);padding-top:20px;margin-bottom:22px}.ac-spell-feedback>h1{font-size:34px;margin:12px 0 8px;letter-spacing:0}.ac-spell-feedback>p{font-size:14px;color:var(--text-2);margin:8px 0}.ac-spell-feedback>small{display:block;margin-top:16px;font-size:12px;color:var(--text-2)}.ac-spell-feedback.correct>b{color:var(--green)}.ac-spell-feedback.incorrect>b{color:var(--red)}.ac-spell-feedback .ac-context{margin-top:18px;text-align:left}.ac-spelling>.ac-muted{margin-top:14px;line-height:1.7}.academic-page[aria-busy=true] .ac-bulk{opacity:.65}
@media(max-width:600px){.ac-guide>summary{padding:13px}.ac-guide-content{padding:0 12px 12px}.ac-guide .ac-table td:first-child{min-width:100px}.ac-guide .ac-table td:nth-child(2){min-width:135px}.ac-guide .ac-table td:nth-child(3){min-width:235px}.ac-level-tip{margin-bottom:13px}.ac-bulk{padding:12px;gap:10px}.ac-bulk-actions{width:100%;gap:8px}.ac-bulk-actions button{flex:1;padding:10px 6px;white-space:nowrap}.ac-bulk small{line-height:1.7}.ac-tabs{width:100%;justify-content:space-between}.ac-tabs button{flex:1;padding:9px 7px;font-size:12px;white-space:nowrap}.ac-word-table td:nth-child(2){min-width:155px}.ac-word-table td:nth-child(3){min-width:215px}.ac-word-table td:nth-child(4){min-width:100px}.ac-spell-meaning{font-size:21px}.ac-spelling .ac-study-meta{line-height:1.6;align-items:flex-start}.ac-spell-feedback>h1{font-size:30px}}
/* Personal wordbook shares the learning controls and progress with the catalog. */
.ac-origin{padding:17px 20px;border-left:3px solid var(--primary);border-radius:0 12px 12px 0;background:var(--primary-soft);margin:-6px 0 22px;font-size:13px;line-height:1.8;color:var(--text-2)}.ac-origin b{display:block;color:var(--primary);font-size:13px;margin-top:7px}.ac-origin small{display:block;font-size:12px;margin-top:2px}.ac-book-intro{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px;margin-bottom:20px;border:1px solid var(--border);border-radius:var(--radius);background:white}.ac-book-intro b{font-size:15px}.ac-book-intro p{font-size:12px;line-height:1.8;color:var(--text-2);margin-top:6px}.ac-book-intro button{width:auto;white-space:nowrap}.ac-title-row .ac-actions{flex-shrink:0}.ac-title-row .ac-actions .btn-primary{width:auto;white-space:nowrap;font-size:12px}.ac-row-actions{display:flex;flex-direction:column;gap:8px;align-items:flex-start}.ac-row-actions .ac-link{font-size:12px;margin-bottom:4px}.ac-collect{color:var(--primary);border-color:#d6d1fc}.ac-collect.is-collected:disabled{opacity:1;color:var(--primary);background:var(--primary-soft)}.ac-word-origin{display:block;color:var(--text-3);font-size:10px;margin-top:5px}.ac-word-table .ac-syn-cell{min-width:130px;max-width:190px}.ac-synonyms b{font-size:13px;font-weight:500;color:var(--primary);overflow-wrap:anywhere}.ac-synonyms small{display:block;color:var(--text-3);font-size:10px;margin-top:5px}.ac-word-table th:nth-child(2){width:20%}.ac-word-table th:nth-child(3){width:26%}
@media(max-width:1100px){.ac-title-row{flex-wrap:wrap}.ac-title-row .ac-actions{margin-left:auto}}
@media(max-width:600px){.ac-book-intro{flex-wrap:wrap;padding:15px;gap:12px}.ac-title-row .ac-actions{width:100%;justify-content:flex-end;gap:8px}.ac-title-row .ac-actions .btn-primary{padding:8px 12px}.ac-origin{padding:12px 14px;font-size:12px}.ac-origin b{font-size:12px}.ac-bulk-actions{flex-wrap:wrap}.ac-word-table td:nth-child(4){min-width:135px}.ac-word-table td:nth-child(5){min-width:90px}.ac-word-table td:nth-child(6){min-width:130px}.ac-toolbar label{font-size:12px}}
.ac-spell-modes{display:inline-flex;gap:4px;padding:4px;background:var(--surface-2);border-radius:8px;margin:-10px 0 20px}.ac-spell-modes button{border:0;background:none;padding:6px 12px;font-size:12px;color:var(--text-2);border-radius:6px}.ac-spell-modes .active{background:var(--primary-soft);color:var(--primary)}.ac-spell-context{margin:20px 0 0;border:1px solid var(--border);background:var(--surface-2);padding:18px;border-radius:10px;line-height:1.8}.ac-spell-context b{font-size:19px;font-weight:500}.ac-spell-context small{display:block;font-size:12px;color:var(--text-2)}

/* Phone list: recognition and collection stay in the same vertical reading flow. */
.ac-mobile-list,.ac-mobile-bulk-count{display:none}
@media(max-width:720px){
  .ac-desktop-list{display:none}
  .ac-mobile-list{display:flex;flex-direction:column;gap:10px}
  .ac-mobile-word{min-width:0;padding:12px 14px 0;border:1px solid var(--border);border-radius:14px;background:var(--surface);scroll-margin-bottom:190px}
  .ac-mobile-word.ac-selected-row{border-color:var(--primary);background:#f8f7ff}
  .ac-mobile-word-head{display:flex;align-items:center;gap:10px;justify-content:space-between}
  .ac-mobile-term{min-width:0;flex:1}
  .ac-mobile-term .ac-wordline{gap:4px;flex-wrap:wrap}
  .ac-mobile-term .ac-wordline b{font-size:18px;line-height:1.35;overflow-wrap:anywhere;letter-spacing:0;min-width:0}
  .ac-mobile-term .ac-audio{width:44px;height:44px;font-size:17px}
  .ac-mobile-term .ac-ipa{display:block;font-size:12px;line-height:1.5;overflow-wrap:anywhere}
  .ac-mobile-primary{flex:0 0 auto;max-width:42%}
  .ac-mobile-primary .btn-ghost{width:auto;min-height:44px;padding:9px 11px;font-size:12px;font-weight:600;white-space:nowrap;border-radius:10px}
  .ac-mobile-primary .ac-collect{background:var(--primary-soft);border-color:#d6d1fc}
  .ac-mobile-primary .ac-collect.is-collected{background:var(--surface);border-color:var(--border);color:var(--text-2)}
  .ac-mobile-meaning{font-size:14px;line-height:1.6;color:var(--text);margin:10px 0 6px;overflow-wrap:anywhere}
  .ac-mobile-state{display:flex;gap:6px 10px;flex-wrap:wrap;align-items:center;font-size:11px;line-height:1.6;color:var(--text-3)}
  .ac-mobile-word-tools{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px;margin-top:4px}
  .ac-mobile-select{display:inline-flex;align-items:center;gap:8px;min-width:66px;min-height:44px;font-size:12px;color:var(--text-2);cursor:pointer}
  .ac-mobile-select input{width:18px;height:18px;margin:0;accent-color:var(--primary);cursor:pointer}
  .ac-detail-toggle{display:flex;gap:6px;align-items:center;justify-content:flex-end;min-height:44px;padding:6px 0 6px 12px;font-size:12px}
  .ac-detail-toggle span{font-size:16px}
  .ac-mobile-details{border-top:1px solid var(--border);padding:14px 0;overflow-wrap:anywhere}
  .ac-mobile-details[hidden]{display:none}
  .ac-mobile-coll>small,.ac-mobile-syn>small{display:block;font-size:11px;color:var(--text-3);margin-bottom:5px}
  .ac-mobile-coll>b{display:block;font-size:14px;font-weight:500;color:var(--primary);line-height:1.6}
  .ac-mobile-coll>p{font-size:12px;line-height:1.7;color:var(--text-2);margin-top:3px}
  .ac-mobile-syn{margin-top:12px}
  .ac-mobile-source{display:block;font-size:10px;color:var(--text-3);line-height:1.7;margin-top:10px}
  .ac-mobile-more-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
  .ac-mobile-more-actions .btn-ghost{width:auto;flex:1;min-height:44px;padding:8px;font-size:12px;white-space:nowrap}
  .ac-bulk{padding:2px 12px;margin-bottom:12px;gap:0;background:var(--surface);border-color:var(--border)}
  .ac-bulk-selection{width:100%;gap:8px;justify-content:space-between}
  .ac-bulk-selection label,.ac-bulk-selection button{min-height:44px}
  .ac-bulk-selection button:disabled{visibility:hidden}
  .ac-bulk-selection label{font-size:12px}
  .ac-bulk>small,.ac-bulk-actions{display:none}
  .ac-has-selection .ac-bulk-actions{display:flex;position:fixed;z-index:51;left:12px;right:12px;bottom:calc(68px + env(safe-area-inset-bottom,0px));width:auto;gap:8px;padding:10px 12px 12px;border:1px solid #dedcfa;border-radius:14px;background:var(--surface);box-shadow:0 4px 24px #27235b22}
  .ac-has-selection .ac-mobile-bulk-count{display:block;flex-basis:100%;font-size:12px;font-weight:600;color:var(--primary)}
  .ac-has-selection .ac-bulk-actions button{flex:1;min-height:44px;padding:9px 8px;font-size:12px;white-space:nowrap}
  .ac-has-selection .ac-bulk-actions [data-action="removeSpelling"]{flex-basis:100%}
  .academic-page.ac-has-selection{padding-bottom:calc(210px + env(safe-area-inset-bottom,0px))}
  .ac-list-undo{position:fixed;right:14px;bottom:calc(72px + env(safe-area-inset-bottom,0px));z-index:49;min-height:44px;padding:10px 14px;border:1px solid var(--border);border-radius:12px;background:var(--surface);box-shadow:0 2px 12px #27235b18}
  .ac-has-selection .ac-list-undo{display:none}
  .ac-pagination{gap:10px;flex-wrap:wrap;margin-bottom:46px}
  .ac-pagination button{min-height:44px}
  .ac-toolbar form{min-width:0;flex-basis:100%}
  .ac-toolbar button,.ac-toolbar select{min-height:44px}
}

/* Keep the review decisions within thumb reach, even with long source text. */
.ac-mobile-card-flip{display:none}
.ac-card-meta-actions{display:flex;align-items:center;gap:12px}
@media(max-width:720px){
  .academic-page.ac-card-mode .ac-origin,
  .academic-page.ac-card-mode .ac-guide,
  .academic-page.ac-card-mode .ac-levels,
  .academic-page.ac-card-mode .ac-level-tip,
  .academic-page.ac-card-mode .ac-summary,
  .academic-page.ac-card-mode .ac-book-intro,
  .academic-page.ac-card-mode .ac-footer{display:none}
  .academic-page.ac-card-mode .ac-breadcrumb{margin-bottom:6px}
  .academic-page.ac-card-mode .ac-title-row{flex-wrap:nowrap;align-items:center;gap:8px;margin-bottom:12px}
  .academic-page.ac-card-mode .page-title{font-size:18px}
  .academic-page.ac-card-mode .page-desc{display:none}
  .academic-page.ac-card-mode .ac-title-row .ac-actions{width:auto;margin:0;flex-shrink:0}
  .academic-page.ac-card-mode .ac-title-row .ac-actions>:not([data-ac="settings"]){display:none}
  .academic-page.ac-card-mode [data-ac="settings"]{min-height:44px;padding:8px;font-size:12px}
  .academic-page.ac-card-mode .ac-section-head{gap:6px;margin-bottom:4px;scroll-margin-top:8px}
  .academic-page.ac-card-mode .ac-section-head>.ac-muted{display:none}
  .academic-page.ac-card-mode .ac-tabs{width:100%}
  .academic-page.ac-card-mode .ac-tabs button{min-height:44px}
  .academic-page.ac-card-mode.ac-has-card{padding-bottom:calc(240px + env(safe-area-inset-bottom,0px))}
  .ac-card-study{margin:8px 0 0;max-width:none}
  .ac-card-study .ac-study-meta{min-height:44px;gap:8px;margin-bottom:6px;font-size:11px}
  .ac-card-meta-actions{gap:8px;white-space:nowrap}
  .ac-card-meta-actions .ac-link{min-height:44px;padding:8px 0 8px 6px;font-size:12px}
  .ac-card-study .ac-flashcard{min-height:0;padding:40px 16px 16px;border-radius:16px}
  .ac-card-study .ac-card-level{top:10px;right:12px;padding:2px 7px;font-size:11px}
  .ac-card-study .ac-flashcard h1{font-size:32px;line-height:1.2;letter-spacing:-.3px}
  .ac-card-study .ac-card-pron{gap:8px;margin-top:8px;font-size:15px;flex-wrap:wrap;overflow-wrap:anywhere}
  .ac-card-study .ac-card-pron .ac-audio{width:44px;height:44px;font-size:17px}
  .ac-card-study .ac-recall{padding-top:14px}
  .ac-card-study .ac-recall p{font-size:12px;margin:0;line-height:1.7}
  .ac-card-study .ac-recall .btn-primary{display:none}
  .ac-card-study .ac-answer{margin-top:14px;padding-top:14px}
  .ac-card-study .ac-answer h2{font-size:18px;line-height:1.5;margin-bottom:12px}
  .ac-card-study .ac-context{padding:10px 12px;overflow-wrap:anywhere}
  .ac-card-study .ac-context b{font-size:15px;line-height:1.5}
  .ac-card-study .ac-context p{font-size:12px;line-height:1.6;margin-top:4px}
  .ac-card-study .ac-context small{font-size:10px}
  .ac-card-study .ac-syn{margin-top:12px;font-size:12px}
  .ac-card-study .ac-answer details{margin-top:8px;font-size:12px}
  .ac-card-study .ac-answer summary{display:flex;align-items:center;min-height:44px;line-height:1.5}
  .ac-card-study .ac-source-quote{padding:8px 0;overflow-wrap:anywhere}
  .ac-card-controls{position:fixed;z-index:51;left:12px;right:12px;bottom:calc(68px + env(safe-area-inset-bottom,0px));padding:10px 12px 12px;border:1px solid #dedcfa;border-radius:14px;background:var(--surface);box-shadow:0 4px 24px #27235b22}
  .ac-card-controls .ac-mobile-card-flip{display:block;width:100%;min-height:44px;padding:10px 12px;font-size:14px}
  .ac-card-controls .ac-ratings{margin-top:0;gap:6px}
  .ac-card-controls .ac-ratings button{min-height:58px;padding:7px 3px;font-size:13px}
  .ac-card-controls .ac-ratings small{font-size:11px;line-height:1.4;margin-top:3px}
  .ac-card-controls .ac-master{min-height:44px;margin-top:8px;padding:9px 6px;font-size:14px}
  .ac-card-controls .ac-key,.ac-card-study .ac-study-foot{display:none}
}

@media(max-width:720px){
  .ac-card-study .ac-answer summary::after{content:'⌄';margin-left:auto;padding-left:8px;color:var(--primary)}
  .ac-card-study .ac-answer details[open]>summary::after{content:'⌃'}
}

/* Catalog overview: keep explanations available without delaying the word list. */
.academic-page.ac-catalog .ac-breadcrumb{margin-bottom:10px}
.ac-catalog .ac-title-row{flex-wrap:nowrap;gap:12px;margin-bottom:2px}
.ac-catalog .ac-title-row .page-title{margin:0;min-width:0}
.ac-catalog .ac-title-row .ac-actions{width:auto;margin:0;gap:8px;flex-wrap:nowrap}
.ac-catalog .ac-title-row .ac-settings-icon{width:44px;min-height:44px;padding:8px;font-size:20px}
.ac-catalog .ac-title-row [data-ac="book"]{min-height:44px;padding:9px 14px;border-radius:10px}
.ac-intro-line,.ac-level-heading,.ac-catalog-progress{display:flex;justify-content:space-between;align-items:center;gap:8px}
.ac-intro-line{margin-bottom:2px}
.ac-intro-line p{font-size:13px;line-height:1.6;color:var(--text-2)}
.ac-help-toggle{display:inline-flex;align-items:center;justify-content:flex-end;gap:4px;min-height:44px;padding:6px 0 6px 6px;font-size:12px;white-space:nowrap;flex-shrink:0}
.ac-help-toggle span{font-size:15px}
.ac-level-heading{font-size:12px;color:var(--text-2)}
.ac-catalog .ac-levels{grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;margin:0}
.ac-catalog .ac-level{flex-direction:row;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:9px 10px;border:1px solid var(--border);border-radius:10px;text-align:center;transform:none}
.ac-catalog .ac-level b{font-size:18px;line-height:1.3}
.ac-catalog .ac-level span{font-size:13px;font-weight:500;white-space:nowrap}
.ac-catalog .ac-level.selected{padding:9px 10px;border-color:var(--primary);box-shadow:inset 0 0 0 1px var(--primary)}
.ac-catalog .ac-level:disabled{opacity:1;background:var(--surface-2);color:var(--text-3);border-color:var(--border)}
.ac-catalog-progress{flex-wrap:wrap;margin:12px 0 16px;font-size:12px;line-height:1.5;color:var(--text-2)}
.ac-catalog-progress>span{white-space:nowrap}
.ac-catalog-progress b{font-weight:600}
.ac-help-panel{border:1px solid var(--border);border-radius:12px;background:var(--surface);padding:14px 16px;margin:0 0 12px;font-size:13px;line-height:1.7;color:var(--text-2)}
.ac-help-panel[hidden]{display:none}
.ac-help-panel>p+p{margin-top:6px}
.ac-help-panel b{color:var(--text);font-weight:600}
.ac-guide-levels{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 24px;margin:14px 0}
.ac-guide-level-title{display:flex;align-items:center;justify-content:space-between;gap:8px}
.ac-guide-level-title>span{font-size:11px;white-space:nowrap;color:var(--primary)}
.ac-guide-levels p{font-size:12px;margin-top:4px}
.ac-help-panel .ac-guide-note{font-size:11px;color:var(--text-3)}
.ac-guide-note a{color:var(--primary);white-space:nowrap}
.ac-catalog .ac-section-head{margin-bottom:10px}
.ac-catalog .ac-toolbar{margin:10px 0}
.ac-catalog .ac-toolbar input{min-width:0}
@media(max-width:1000px){
  .ac-catalog .ac-levels{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:720px){
  .ac-catalog .ac-breadcrumb{font-size:12px}
  .ac-catalog .ac-title-prefix{display:none}
  .ac-catalog .ac-title-row{gap:8px;align-items:center}
  .ac-catalog .ac-title-row .page-title{font-size:19px;line-height:1.4}
  .ac-catalog .ac-title-row .ac-actions{gap:6px}
  .ac-catalog .ac-title-row [data-ac="book"]{padding:8px 10px;font-size:12px}
  .ac-catalog .ac-intro-line p{font-size:12px}
  .ac-catalog .ac-levels{gap:6px}
  .ac-catalog .ac-level,.ac-catalog .ac-level.selected{min-height:44px;gap:5px;padding:8px 6px}
  .ac-catalog .ac-level b{font-size:16px}
  .ac-catalog .ac-level span{font-size:12px}
  .ac-catalog-progress{font-size:11px;margin:10px 0 12px;gap:4px 8px}
  .ac-guide-levels{grid-template-columns:1fr;gap:12px}
  .ac-help-panel{padding:12px;font-size:12px}
  .ac-catalog .ac-tabs{width:100%}
  .ac-catalog .ac-tabs button{min-height:44px;flex:1;padding:8px 5px;font-size:12px;white-space:nowrap}
  .ac-catalog .ac-toolbar{display:grid;grid-template-columns:minmax(0,1fr) 100px;gap:8px}
  .ac-catalog .ac-toolbar form{min-width:0;gap:6px}
  .ac-catalog .ac-toolbar form button{padding:8px;min-width:44px;font-size:12px}
  .ac-catalog .ac-toolbar input{font-size:13px;padding:10px}
  .ac-catalog .ac-toolbar label,.ac-catalog .ac-toolbar select{min-width:0;width:100%}
  .ac-catalog .ac-filter-label{display:none}
  .academic-page.ac-catalog.ac-card-mode .ac-intro-line,
  .academic-page.ac-catalog.ac-card-mode .ac-help-panel,
  .academic-page.ac-catalog.ac-card-mode .ac-level-picker,
  .academic-page.ac-catalog.ac-card-mode .ac-catalog-progress{display:none}
}
@media(max-width:350px){
  .ac-catalog .ac-title-row .page-title{font-size:17px}
  .ac-catalog .ac-title-row .ac-actions{gap:3px}
  .ac-catalog .ac-title-row [data-ac="book"]{padding:8px;font-size:11px}
  .ac-catalog .ac-intro-line{flex-wrap:wrap;gap:0}
  .ac-catalog .ac-intro-line .ac-help-toggle{margin-left:auto}
  .ac-catalog .ac-toolbar{grid-template-columns:minmax(0,1fr) 86px;gap:6px}
}

/* Logic catalog: category first, then compact lessons with explicit direction. */
.logic-study-wrap[hidden],.ac-catalog-progress[hidden]{display:none}
.logic-intro{color:var(--text-2);margin:0 0 16px;font-size:15px;line-height:1.6}
.logic-overview-stats{display:flex;gap:22px;flex-wrap:wrap;font-size:13px;color:var(--text-2);margin-bottom:24px}
.logic-overview-stats b{color:var(--primary);font-size:18px}
.logic-categories{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.logic-category{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px;text-align:left;display:flex;flex-direction:column;gap:9px;min-width:0;color:var(--text)}
.logic-category:hover{border-color:var(--primary);background:#fcfbff}
.logic-category-number{font-size:12px;color:var(--primary);font-weight:600}
.logic-category>b{font-size:17px;line-height:1.45;padding-right:16px}
.logic-category>span:not(.logic-category-number){font-size:12px;color:var(--text-2);line-height:1.6}
.logic-category>small{font-size:12px;color:var(--text-3)}
.logic-category>i{position:absolute;right:20px;top:22px;color:var(--primary);font-style:normal}
.logic-source-note{font-size:12px;line-height:1.8;color:var(--text-3);margin:18px 0}
.logic-picker{display:flex;align-items:center;gap:16px;margin:12px 0}.logic-picker .input{margin:0;width:auto;max-width:100%;flex:1;min-width:0}.logic-picker>.ac-link{flex-shrink:0;min-height:44px}
.logic-groups{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 16px}.logic-groups button{min-height:40px;border:1px solid var(--border);background:var(--surface);color:var(--text-2);border-radius:9px;padding:8px 14px;font-size:13px}.logic-groups button.active{background:var(--primary-soft);border-color:var(--primary);color:var(--primary);font-weight:600}.logic-groups small{opacity:.7;margin-left:4px}
.logic-list{display:flex;flex-direction:column;gap:16px}
.logic-list-word{border:1px solid var(--border);border-radius:14px;background:var(--surface);padding:20px 24px;min-width:0;scroll-margin-bottom:180px}
.logic-list-word.ac-selected-row{border-color:var(--primary)}
.logic-list-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.logic-list-head>div{min-width:0}.logic-list-head .ac-wordline{flex-wrap:wrap;gap:8px}.logic-list-head .ac-wordline b{font-size:22px;overflow-wrap:anywhere}.logic-list-head .ac-collect{flex-shrink:0;width:auto;min-height:44px;padding:9px 12px;font-size:12px}.logic-list-head .ac-audio{width:40px;height:40px}.logic-meaning{font-size:15px;margin:8px 0 12px;color:var(--text)}
.logic-example{padding:14px 16px;background:var(--primary-soft);border-radius:10px;font-size:15px;line-height:1.75;text-align:left;overflow-wrap:anywhere}
.logic-function{display:inline-block;font-size:11px;font-weight:600;color:var(--primary);margin-bottom:5px}
.logic-cue{color:var(--primary);font-weight:700;text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1.5px}
.logic-example .logic-example-zh{margin-top:7px;font-size:13px;line-height:1.85;color:var(--text-2)}
.logic-role-text{border-bottom:1px dotted #aaa6d7}.logic-role-label{font-size:11px;white-space:nowrap;color:var(--primary)}
.logic-chain{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:12px;line-height:1.5;color:var(--text-2);margin-top:9px}
.logic-chain-arrow{font-size:17px;color:var(--primary)}
.logic-other{border-top:1px dashed var(--border);margin-top:12px;padding-top:12px;line-height:1.7}.logic-other>b{font-size:12px;color:#876320}.logic-other>p{font-size:13px;color:var(--text-2);margin-top:4px}
.logic-list-foot{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding-top:10px;margin-top:10px;border-top:1px solid var(--border);font-size:12px;color:var(--text-3)}.logic-list-foot>label{display:flex;align-items:center;gap:6px;min-height:40px}.logic-list-foot input{width:18px;height:18px;accent-color:var(--primary)}.logic-list-foot>button{margin-left:auto;min-height:40px}.logic-list-foot>small{font-size:11px}
.logic-flashcard{padding-top:58px}.logic-flashcard h1{font-size:34px;letter-spacing:0}.logic-flashcard .ac-answer{margin-top:18px;padding-top:16px}.logic-flashcard .ac-answer h2{font-size:20px;margin-bottom:16px}.logic-card-collect{display:block;min-height:44px;margin:12px auto 0}
#acAnalyticsScope{width:auto}
@media(max-width:900px){.logic-categories{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:720px){
 .ac-logic .ac-title-row{gap:8px;margin-bottom:12px}.ac-logic .page-title{font-size:20px}.ac-logic .ac-actions{width:auto;margin-left:auto}
 .logic-category{padding:14px;gap:7px}.logic-category>b{font-size:14px;padding-right:0}.logic-category>i{right:14px;top:14px}.logic-category>small{font-size:11px}.logic-category>span:not(.logic-category-number){font-size:12px}
 .logic-categories{gap:10px}.logic-overview-stats{margin-bottom:16px;gap:16px;font-size:12px}.logic-intro{font-size:13px}
 .logic-groups{gap:6px}.logic-groups button{padding:8px 10px;min-height:44px;font-size:12px}.logic-picker{gap:10px}.logic-picker .input{font-size:13px;min-height:44px}
 .logic-list-word{padding:14px}.logic-list-head .ac-wordline b{font-size:19px}.logic-list-head .ac-audio{width:44px;height:44px}.logic-list-head .ac-collect{padding:9px;font-size:11px;max-width:110px}
 .logic-example{padding:12px;font-size:14px}.logic-example .logic-example-zh{font-size:13px}.logic-other>p{font-size:12px}
 .logic-list-foot{gap:8px}.logic-list-foot>small{width:100%;order:4}.logic-list-foot>button{min-height:44px}.logic-list-foot>label{min-height:44px}
 .logic-flashcard{padding:46px 16px 16px}.logic-flashcard h1{font-size:27px;line-height:1.3}.logic-flashcard .ac-card-level{font-size:10px}.logic-flashcard .ac-answer h2{font-size:18px;margin-bottom:12px}
 .ac-actions #acAnalyticsScope{width:150px}.logic-source-note{font-size:11px}
}
.logic-picker .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:720px){.logic-flashcard{min-height:240px;scroll-margin-top:12px}.logic-flashcard .ac-card-pron{margin-top:8px}.logic-flashcard .ac-answer{margin-top:14px;padding-top:14px}.logic-flashcard .ac-answer h2{margin-bottom:12px}}