:root{font:16px/1.5 system-ui,-apple-system,sans-serif;color:#1d2b43;background:#f0f5fc}*{box-sizing:border-box}body{margin:0}a{color:inherit}button,input,textarea,select{font:inherit}button,.button{cursor:pointer;border:1px solid #d6deeb;border-radius:12px;padding:11px 18px;background:white;color:#21334f;text-decoration:none;display:inline-block}button.primary,.button.primary{background:#5544ee;color:white;border-color:#5544ee;font-weight:700}button:disabled{opacity:.55;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #9c8eff;outline-offset:2px}header{background:#fff;border-bottom:1px solid #dce3ee;padding:18px max(24px,calc((100vw - 1320px)/2));display:flex;justify-content:space-between;align-items:center;gap:16px}header strong{font-size:1.2rem}nav,.actions{display:flex;gap:10px;flex-wrap:wrap}.wrap{max-width:1360px;margin:auto;padding:24px}.card{background:white;border:1px solid #dce3ee;border-radius:18px;padding:24px;margin-bottom:18px;box-shadow:0 6px 18px #1e345309}.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px}.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px}.builder{display:grid;grid-template-columns:250px minmax(0,1fr);gap:24px}h1{font-size:1.8rem;margin:0 0 20px}h2{font-size:1.2rem;margin:0 0 16px}p{margin:12px 0}.muted{color:#68778e;font-size:.9rem}label{display:block;font-weight:650;margin-bottom:14px}input:not([type=checkbox]),textarea,select{display:block;width:100%;padding:12px;border:1px solid #ced8e7;border-radius:10px;background:white;color:#1d2b43;margin-top:6px}textarea{min-height:96px;resize:vertical}input[type=checkbox]{width:20px;height:20px;vertical-align:middle;margin-right:8px}.lesson-button{display:block;width:100%;text-align:left;margin:10px 0}.lesson-button.active{border-color:#5544ee;background:#eeecff}.question-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.question-tabs button.active{background:#5544ee;color:#fff}.tag{display:inline-block;border-radius:8px;padding:5px 10px;background:#e9e6ff;color:#5242d2;font-size:.9rem}.status{white-space:pre-wrap}.error{color:#b32642;background:#fff0f2;padding:14px;border-radius:10px}.success{color:#14765a;background:#ecfcf4;padding:14px;border-radius:10px}.question-picture{display:block;width:100%;max-height:460px;object-fit:contain;background:white;border-radius:16px;margin-bottom:24px}.question-text{font-size:1.18rem;white-space:pre-wrap;margin:0}.answer{font-size:1.4rem!important;font-weight:650}.letters{display:flex;flex-wrap:wrap;gap:9px;justify-content:center;margin:16px 0 24px}.letters button{font-size:1.2rem;font-weight:700;width:48px;height:48px;padding:0;background:#334258;color:white}.letters button:disabled{background:#dce4ee;color:#6e7b8e}.wide{width:100%;background:#202d42;color:white;font-weight:700}.point{font-size:2.4rem;font-weight:800;text-align:center;background:#ffe5e9;border-radius:12px;margin:8px 0 16px;padding:10px}.total-point{font-size:1.5rem;background:#fff9e6;border:1px solid #ead589;padding:12px;border-radius:12px;font-weight:750;color:#b97009}.feedback{white-space:pre-wrap;padding:18px;border-radius:12px;margin-top:18px;background:#fff0f2;color:#ad2344;border:1px solid #edbec8}.feedback.success{background:#edfcf5;color:#14765a;border-color:#afe4d0}table{width:100%;border-collapse:collapse;font-size:.9rem}th,td{padding:12px 8px;border-bottom:1px solid #e4e8f1;text-align:left}th{color:#6a7891}progress{width:100%;height:8px;margin:12px 0}.table-scroll{overflow:auto}.history-item{padding:18px 0;border-bottom:1px solid #e3e7ef}.history-item:last-child{border:0}.option-list{display:grid;gap:10px}.option-list button{text-align:left}.option-list button.selected{background:#eeecff;border-color:#5544ee}.preview-note{background:#fff8df;padding:12px 24px;text-align:center}.empty{padding:36px;text-align:center}.danger{color:#af2840}.editor-dark{background:#101a2b;color:#edf3ff}.editor-dark .card{background:#1e293c;border-color:#354158;box-shadow:none}.editor-dark input,.editor-dark select,.editor-dark textarea,.editor-dark button{background:#334155;color:#edf3ff;border-color:#46546c}.editor-dark .primary{background:#5544ee}.editor-dark .muted{color:#a7b6cf}.editor-dark header{background:#1e293c;border-color:#354158}.editor-dark .active{background:#5544ee}.editor-dark .success{background:#164b3d;color:#d9fff2}[hidden]{display:none!important}@media(max-width:900px){.builder{grid-template-columns:1fr}.layout{grid-template-columns:1fr}.wrap{padding:16px}.card{padding:18px}header{padding:16px;flex-wrap:wrap}aside .lesson-button{display:inline-block;width:auto;margin:5px}h1{font-size:1.5rem}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s}}

.lesson-settings-row{display:grid;grid-template-columns:110px 110px 150px minmax(180px,1fr) minmax(190px,1.1fr) 90px;gap:14px;align-items:start}.lesson-settings-row label{font-size:.875rem}.inline-action{border:0!important;background:transparent!important;color:#a99dff!important;padding:0 4px;font-size:.8rem}.lesson-button small{display:block;margin-top:8px;font-size:.875rem;font-weight:400;color:#b4c3da}.lesson-button strong{display:block}.lesson-button{padding:14px}.subject-tabs .active{background:#5544ee}.builder .card{padding:18px}@media(min-width:1400px){.editor-dark .wrap{max-width:1600px}.builder{grid-template-columns:255px minmax(0,1fr)}}@media(max-width:1190px){.lesson-settings-row{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:600px){.lesson-settings-row{grid-template-columns:1fr}.lesson-settings-row label{font-size:1rem}}

.lesson-settings-row{grid-template-columns:minmax(0,.8fr) minmax(0,.8fr) minmax(0,1fr);gap:16px}.lesson-settings-row>*{min-width:0}.lesson-settings-row input,.lesson-settings-row select{min-width:0}.icon-field{font-size:.875rem;font-weight:650}.icon-upload{display:block;width:72px;height:64px;padding:6px;margin-top:6px}.icon-upload img{width:100%;height:100%;object-fit:contain}.icon-upload span{display:flex;height:100%;align-items:center;justify-content:center;font-size:1.5rem}.icon-field small{display:block;margin-top:5px;font-weight:400}.lesson-icon{width:48px;height:48px;object-fit:contain;vertical-align:middle;margin-right:10px}@media(min-width:1600px){.lesson-settings-row{grid-template-columns:minmax(0,.65fr) minmax(0,.65fr) minmax(0,.9fr) minmax(0,1.3fr) minmax(0,1.3fr) 90px}}@media(max-width:600px){.lesson-settings-row{grid-template-columns:minmax(0,1fr)}}

.save-success{width:min(380px,calc(100vw - 32px));padding:28px;border:1px solid #46546c;border-radius:18px;background:#1e293c;color:#edf3ff;text-align:center;box-shadow:0 20px 70px #0006}.save-success::backdrop{background:#0008}.save-success h2{margin:12px 0 8px;font-size:1.3rem}.save-success p{color:#b4c3da;margin-bottom:22px}.save-success-mark{font-size:2rem;color:#42d6ab}.save-success button{min-width:100px}

.quiz-editor-meta{display:grid;grid-template-columns:110px minmax(200px,300px);gap:16px;margin-top:18px}.quiz-editor-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:26px;margin-bottom:20px}.quiz-editor-grid>*{min-width:0}.quiz-options-card,.quiz-image-card{border:1px solid #46546c;border-radius:14px;padding:18px}.quiz-picture-column textarea[name=prompt]{min-height:90px}.quiz-image-card h2{font-size:1rem}.image-upload-zone{width:100%;min-height:220px;border:2px dashed #607089!important;background:transparent!important;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;overflow:hidden}.upload-symbol{font-size:3rem;line-height:1}.image-upload-zone small{color:#a7b6cf}.image-upload-zone img{width:100%;max-height:300px;object-fit:contain;border-radius:8px}.image-upload-zone.has-image>span,.image-upload-zone.has-image>small{display:none}.image-actions{margin:10px 0}.image-address{font-size:.85rem}.question-tabs{padding:10px;border:1px solid #46546c;border-radius:14px}.question-tabs button{width:42px;height:42px;padding:0;background:#aee1fb;color:#102a42;border:2px solid transparent}.question-tabs button.active{border-color:white;background:#63a7f7}.quiz-stage>.question-picture{margin:18px 0 24px;max-height:360px;object-fit:contain;border-radius:18px;box-shadow:0 7px 12px #1e34531a}.sentence-card{padding:24px;margin-bottom:24px}.word-hint strong{color:#dc2626}.word-blanks{color:#808080;letter-spacing:1px}.quiz-stage #listen{box-shadow:0 6px 12px #1e345316;min-width:220px;text-align:left;padding:10px 16px;border:0;border-radius:10px}.quiz-stage label{font-size:.875rem;color:#687b99}.quiz-stage .answer{height:68px;border:2px solid #dce4ef;box-shadow:0 6px 10px #1e345317;background:white;color:#23344f}.quiz-stage #letter-area>.muted{font-weight:650;margin-top:18px}.quiz-stage .letters{margin-top:12px}.quiz-stage .letters button{border-radius:12px;box-shadow:0 6px 10px #1e34531a}.answer-tools{display:flex;justify-content:flex-end}.answer-tools button{padding:4px 10px;font-size:.8rem;background:transparent;border:0;color:#687b99}.quiz-submit-row{display:flex;gap:12px;margin-top:14px}.quiz-submit-row #backspace{width:48px;flex-shrink:0;padding:0;color:#ed9b5e;background:#f8fbff}.quiz-submit-row #submit{min-height:56px;border-radius:12px;background:#334155}#practice{align-items:start}#practice>aside{margin-top:18px}.quiz-editor .actions{margin-top:16px}@media(max-width:750px){.quiz-editor-grid{grid-template-columns:minmax(0,1fr);gap:16px}.quiz-editor-meta{grid-template-columns:minmax(0,1fr) minmax(0,2fr)}.quiz-stage>.question-picture{max-height:320px}.sentence-card{padding:20px}.quiz-stage .letters{gap:7px}.quiz-stage .letters button{width:42px;height:44px}}