/* The learning area gives its space to the directory, questions and explanations. */
body.learning-shell{background:#fff}
.learning-shell>.site-header,.learning-shell>.site-footer{display:none}
.learning-shell #main{min-height:100dvh;outline:none}
.learning-shell .workspace{width:100%;margin:0;padding:0}
.study-navigation{display:flex;align-items:center;gap:10px;padding:14px 12px;border-bottom:1px solid #e5e9e2;color:#52604d;font-size:12px}
.study-navigation a{display:flex;align-items:center;gap:8px;min-height:32px;padding:0 6px;border-radius:6px}
.study-navigation a:hover{background:#eef2e9}
.study-navigation .back-arrow{font-size:20px;line-height:1}
.study-navigation small{font-size:10px;color:#89917f}
.learning-shell .subject-layout{grid-template-columns:190px minmax(0,1fr);gap:0;min-height:100dvh}
.learning-shell .chapter-sidebar{position:sticky;top:0;border:0;border-right:1px solid #e3e8dc;border-radius:0;background:#fbfcf9;height:100dvh;max-height:100dvh;overflow:auto;padding:0 10px 15px}
.learning-shell .chapter-sidebar .study-navigation{margin:0 -10px 16px}
.compact-subject-name{font:700 20px 'Manrope','Microsoft YaHei',sans-serif;padding:0 12px 4px;line-height:1.4}
.compact-subject-subtitle{font-size:11px;color:#7c8971;padding:0 12px 15px}
.learning-shell .chapter-sidebar h3{padding:0 12px;font-size:10px;letter-spacing:1px;margin:8px 0}
.learning-shell .chapter-button{font-size:12px;padding:9px 12px}
.learning-shell .chapter-button.active{background:#eaf0e2;box-shadow:none}
.subject-main{min-width:0;padding:0 22px 24px}
.subject-search-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:68px;border-bottom:1px solid #e6eadf;margin-bottom:19px}
.subject-search-bar h1{font-size:17px;letter-spacing:0;line-height:1.5;margin:0}
.question-search{display:flex;align-items:center;gap:8px;width:min(420px,55%)}
.question-search input{min-width:0;flex:1;width:100%;background:#fff;border:1px solid #ced8c5;border-radius:7px;padding:9px 12px;font-size:12px;min-height:38px}
.question-search .button{padding:8px 14px;font-size:11px;min-height:38px;gap:7px}
.question-search input::placeholder{color:#8b9682;font-size:11px}
.search-results{border:1px solid #dce4d3;background:#fafcf7;border-radius:9px;padding:16px;margin-bottom:18px;font-size:12px}
.search-results[hidden]{display:none}
.search-results .search-status{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:9px}
.search-status strong{font-size:12px}
.search-status button{border:0;background:transparent;color:#677b57;font-size:11px;padding:4px 8px}
.search-result{display:flex;align-items:center;gap:12px;padding:12px;border-top:1px solid #e2e8d8}
.search-result:first-child{border-top:0}
.search-result-copy{min-width:0;flex:1}
.search-result-copy strong{font-family:'Manrope',sans-serif;font-size:13px}
.search-result-copy p{font-size:11px;color:#7c8a70;line-height:1.6;margin:4px 0 0;overflow-wrap:anywhere}
.search-result>.button{font-size:10px;padding:7px 11px}
.search-empty{color:#7c8a70;margin:5px 0}
.learning-shell .subject-main .dashboard-title{margin:0 0 7px}
.learning-shell .subject-main .dashboard-title h2{font-size:21px;letter-spacing:0}
.learning-shell .subject-main>.fine-print{font-size:11px;margin:0 0 17px}
.learning-shell .module-row{padding:16px 18px;gap:16px;border-radius:9px;background:white}
.learning-shell .module-row.locked{background:#fbfcf9}
.learning-shell .module-detail h3{font-size:13px;margin-bottom:6px}
.learning-shell .module-num{font-size:21px}
.learning-shell .module-list{gap:9px}
.compact-access{padding:8px 12px;font-size:10px;line-height:1.7;color:#7e8c73;margin-top:17px;border-top:1px solid #e4e9dd}
.compact-access strong{color:#587444;font-weight:500}
.compact-access button{display:block;border:0;padding:8px 0 0;color:#567249;background:transparent;font-size:11px}
.learning-shell .quiz-layout{grid-template-columns:168px minmax(0,1fr);gap:0;min-height:100dvh}
.learning-shell .quiz-sidebar{position:sticky;top:0;padding:0 12px 16px;background:#fbfcf9;border:0;border-right:1px solid #e4e9dc;border-radius:0;height:100dvh;max-height:100dvh;overflow:auto}
.learning-shell .quiz-sidebar .study-navigation{margin:0 -12px 17px}
.sidebar-module{font-size:11px;color:#78866d;margin:0 0 17px;line-height:1.6}
.sidebar-module strong{font-size:12px;font-weight:600;color:#42583a;display:block;margin-bottom:7px}
.sidebar-module span{display:block}
.learning-shell .quiz-sidebar h3{font-size:10px;letter-spacing:1px;margin-bottom:12px}
.learning-shell .number-grid{grid-template-columns:repeat(4,1fr);max-height:calc(100dvh - 255px)}
.learning-shell .number-button{height:30px;min-width:0;font-size:10px}
.sidebar-search-link{display:block;border-top:1px solid #e0e7d6;padding:13px 0 0;margin-top:17px;color:#536e44;font-size:11px}
.mcq-content{min-width:0;padding:0 22px 20px;max-width:1500px;width:100%;margin:0 auto}
.learning-shell .quiz-toolbar{min-height:51px;margin:0;border-bottom:1px solid #e5eadd;gap:10px;flex-wrap:nowrap}
.learning-shell .quiz-card{border:0;border-radius:0;padding:18px 0 5px;background:white}
.learning-shell .question-meta{font-size:11px;margin-bottom:16px;letter-spacing:.4px}
.learning-shell .question-meta strong{font:600 13px 'Manrope',sans-serif;color:#4b6440}
.learning-shell .question-body{font-size:16px;line-height:1.85}
.learning-shell .question-options{margin:18px 0}
.learning-shell .option-table{font-size:14px;border-spacing:0 7px}
.learning-shell .option-table td{padding-top:11px;padding-bottom:11px}
.learning-shell .quiz-submit{padding-top:14px}
.learning-shell .quiz-bottom{margin-top:13px}
.learning-shell .note-editor{margin-top:14px}
.learning-shell .explanation-panel{padding:18px;margin-top:13px;border-radius:8px;background:#f6f9f1}
.learning-shell .explanation-panel h3{font-size:13px;margin-bottom:12px}
.learning-shell .lang-zh{font-size:13px}
.learning-shell .empty-state{margin:24px;border-radius:8px}
.admin-page-links{display:flex;align-items:center;gap:10px}
@media(max-width:1100px){.site-header nav{display:none}}
@media(max-width:540px){.site-header{padding:0 12px;gap:10px}.header-actions{gap:10px}.site-header .brand{font-size:21px;gap:6px}.header-actions .text-link{font-size:10px}.header-actions .button{font-size:10px;padding:8px 9px;gap:6px}.admin-page-links{flex-wrap:wrap;justify-content:flex-end;gap:6px}.admin-page-links .button{font-size:10px;padding:7px 10px}}
.learning-shell .error-page{min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center}
.tbs-practice{display:grid;grid-template-columns:42px minmax(0,1fr);width:100%;height:100dvh;overflow:hidden;background:#fff}
.practice-rail{background:#fff;border-right:1px solid #dce3d6;display:flex;flex-direction:column;align-items:center;gap:16px;padding-top:8px;min-width:0;z-index:1}
.practice-rail a{display:flex;align-items:center;justify-content:center;width:34px;min-height:36px;border:1px solid #dce3d5;border-radius:6px;color:#557342;line-height:1.2;font-size:20px}
.practice-rail a:hover{background:#f2f5ed}
.practice-rail span{writing-mode:vertical-rl;font-size:10px;letter-spacing:2px;color:#7d8c6f}
.learning-shell .tbs-frame{width:100%;height:100dvh;min-height:0;border:0;border-radius:0;background:#fff;display:block}
.tbs-layout #main{height:100dvh;overflow:hidden}
@media(min-width:1500px){.mcq-content{max-width:none;padding:0 30px 24px}.learning-shell .question-body{max-width:none}}
@media(max-width:850px){.learning-shell .subject-layout{grid-template-columns:160px minmax(0,1fr)}.subject-main{padding:0 16px 20px}.subject-search-bar{gap:12px}.subject-search-bar h1{font-size:15px}.question-search{width:60%}.learning-shell .module-actions{margin-left:44px}.learning-shell .quiz-layout{grid-template-columns:142px minmax(0,1fr)}.learning-shell .number-grid{display:grid;grid-template-columns:repeat(4,1fr);overflow:auto}.learning-shell .quiz-sidebar h3,.learning-shell .quiz-sidebar .fine-print{display:block}.mcq-content{padding:0 16px 18px}.learning-shell .quiz-toolbar .segmented button{font-size:10px;padding:6px 7px}.learning-shell .favorite-button{font-size:10px;padding:6px 8px}}
@media(max-width:540px){.learning-shell .subject-layout{grid-template-columns:1fr;min-height:100dvh}.learning-shell .chapter-sidebar{height:auto;max-height:none;position:static;display:flex;align-items:center;flex-wrap:nowrap;overflow-x:auto;padding:7px 9px;border-right:0;border-bottom:1px solid #e4e9dc;gap:5px}.learning-shell .chapter-sidebar .study-navigation{margin:0;padding:0;border:0;flex-shrink:0;gap:0}.study-navigation a{font-size:10px;gap:4px}.learning-shell .chapter-sidebar .study-navigation .back-label{display:none}.learning-shell .chapter-sidebar h3,.compact-subject-subtitle,.compact-access{display:none}.compact-subject-name{font-size:14px;padding:0 7px 0 0;margin:0;flex-shrink:0}.learning-shell .chapter-button{padding:7px 9px;font-size:10px}.learning-shell .chapter-button>span{display:none}.subject-main{padding:0 12px 18px}.subject-search-bar{min-height:0;flex-wrap:wrap;gap:10px;padding:13px 0;margin-bottom:16px}.subject-search-bar h1{font-size:14px}.question-search{width:100%}.question-search input{font-size:12px;min-height:40px}.learning-shell .subject-main .dashboard-title h2{font-size:18px}.learning-shell .module-row{padding:14px 12px;gap:11px}.learning-shell .module-detail h3{font-size:12px}.learning-shell .module-num{min-width:27px;font-size:18px}.learning-shell .module-actions{margin-left:38px}.search-results{padding:12px}.search-result{padding:11px 0;flex-wrap:wrap}.search-result>.button{margin-left:auto}.learning-shell .quiz-layout{grid-template-columns:1fr;display:block}.learning-shell .quiz-sidebar{position:static;height:auto;max-height:none;display:flex;align-items:center;gap:10px;padding:6px 9px;border:0;border-bottom:1px solid #e2e8d9;overflow:hidden}.learning-shell .quiz-sidebar .study-navigation{border:0;margin:0;padding:0;flex-shrink:0}.learning-shell .quiz-sidebar .study-navigation a{gap:3px;font-size:10px;padding:0 3px}.learning-shell .quiz-sidebar .sidebar-module,.learning-shell .quiz-sidebar h3,.learning-shell .quiz-sidebar .fine-print,.sidebar-search-link{display:none}.learning-shell .number-grid{display:flex;max-height:none;overflow-x:auto;flex:1;min-width:0;padding:3px;gap:6px}.learning-shell .number-button{min-width:29px;width:29px;height:29px;font-size:10px;flex-shrink:0}.mcq-content{padding:0 12px 17px}.learning-shell .quiz-toolbar{min-height:46px;gap:6px}.learning-shell .quiz-toolbar>div:last-child{gap:6px!important}.learning-shell .quiz-toolbar .segmented button{font-size:9px;padding:5px 7px}.learning-shell .favorite-button{font-size:9px;padding:6px}.learning-shell .quiz-card{padding:14px 0 4px}.learning-shell .question-meta{font-size:9px;margin-bottom:12px}.learning-shell .question-meta strong{font-size:11px}.learning-shell .question-body{font-size:14px;line-height:1.8}.learning-shell .question-options{margin:14px 0}.learning-shell .option-table{font-size:12px}.learning-shell .lang-zh{font-size:12px}.learning-shell .explanation-panel{padding:14px}.learning-shell .quiz-submit{gap:8px}.learning-shell .quiz-submit .button{padding:8px 13px}.learning-shell .answer-result{font-size:10px}.tbs-practice{grid-template-columns:32px minmax(0,1fr)}.practice-rail{padding-top:6px;gap:12px}.practice-rail a{width:27px;min-height:32px;font-size:18px}.practice-rail span{font-size:9px}.learning-shell .empty-state{margin:15px}.learning-shell .quiz-bottom .button{padding:8px 12px;font-size:10px}}