:root{--bg:#f4f6fb;--card:#fff;--text:#1c2233;--muted:#5b6478;--primary:#2f6fed;--primary-text:#fff;--border:#dde2ee;--placeholder:#e9eefb;--hint:#fff7e0;--error:#c62828;color:var(--text);background:var(--bg);font-family:system-ui,Segoe UI,Arial,sans-serif}body{background:var(--bg);margin:0}.app{max-width:760px;margin:0 auto;padding:16px}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:24px}.center{text-align:center}.big{font-size:1.4rem}.badge{background:var(--placeholder);color:var(--muted);border-radius:999px;padding:4px 12px}button{font:inherit;cursor:pointer;border:1px solid var(--border);border-radius:12px;padding:12px 24px}button.primary{background:var(--primary);color:var(--primary-text);border-color:var(--primary);font-size:1.1rem}button.secondary{background:var(--card);color:var(--text)}button:disabled{opacity:.6;cursor:default}button:focus-visible{outline:3px solid 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28px;font-size:1.2rem;font-weight:700}.check-dialog{max-width:min(480px,100vw - 32px)}.check-dialog.failure{border-top-color:#e08a00}.check-dialog.failure h2{color:#7a4300}.check-dialog.update{border-top-color:var(--primary)}.check-dialog.update h2{color:#1d4f8f}.check-dialog-items{gap:8px;margin:0 0 20px;padding:0;font-size:1.1rem;font-weight:600;list-style:none;display:grid}.check-dialog-items li.update:before{content:"ℹ "}.check-dialog-items li.failure:before{content:"✗ "}.check-dialog-items li.system:before{content:"⚠ "}.step-body{flex:1;min-height:0;display:flex;position:relative}.step-menu{z-index:10;flex:none;position:relative}.fab{border:2px solid var(--card);background:var(--primary);width:40px;height:40px;color:var(--primary-text);z-index:1;border-radius:50%;padding:0;font-size:1.2rem;position:relative;box-shadow:0 2px 8px #00000040}.step-menu-panel{top:calc(100% + 8px);box-sizing:border-box;background:var(--card);border:1px solid var(--border);border-radius:16px;gap:12px;width:min(420px,100vw - 32px);max-height:calc(100vh - 120px);padding:16px 20px;display:grid;position:absolute;inset-inline-end:0;overflow-y:auto;box-shadow:0 8px 24px #0003}.step-menu-panel h2,.step-menu-panel h3,.step-menu-panel p{margin:0}.step-menu-panel h2{font-size:1.2rem}.step-menu-panel h3{color:var(--muted);font-size:1rem}.revisit-note{background:var(--hint);color:#6b4e00;border-radius:8px;padding:8px 12px}.revisit{justify-items:start;gap:8px;display:grid}.revisit-list{gap:6px;width:100%;margin:0;padding:0;list-style:none;display:grid}.revisit-list button{text-align:start;white-space:nowrap;text-overflow:ellipsis;width:100%;overflow:hidden}.menu-actions{gap:8px;display:flex}.menu-actions button{flex:1;padding:8px 12px}.icon-button{background:0 0;border:none;padding:2px 8px;font-size:1rem}.video-frame{aspect-ratio:16/9;background:#000;display:flex}.floating-window.video-floating{max-height:none;overflow:hidden}.video-floating 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var(--danger);color:var(--danger);border-radius:999px;padding:2px 8px;font-size:.9rem;font-weight:600;display:inline-block}.properties-table{border-collapse:collapse}.properties-table td{padding:4px 8px}.properties-table tr.selected td{background:var(--placeholder)}.approval-window{z-index:30;background:var(--card);border:1px solid var(--border);border-radius:12px;align-content:start;gap:12px;width:min(50vw,520px);min-height:25vh;max-height:60vh;padding:16px 20px;display:grid;position:fixed;top:50%;left:50%;overflow:auto;transform:translate(-50%,-50%);box-shadow:0 8px 24px #0000002e}.approval-strip{z-index:30;border:1px solid var(--primary);background:var(--card);border-radius:999px;padding:8px 20px;font-weight:600;position:fixed;bottom:12px;left:50%;transform:translate(-50%);box-shadow:0 4px 12px #00000026}.teacher-checklist{margin:4px 0;padding-inline-start:20px}.board-actions{justify-items:start;gap:6px;display:grid}.approve-block{gap:4px;display:grid}.checklist-section{margin-bottom:16px}.checklist-section h2{margin:8px 0 4px;font-size:1.05rem}.save-status{color:var(--muted);white-space:nowrap;font-size:.85rem}.save-status.saved{color:#1b6e36}.save-status.error{color:var(--danger);font-weight:600}.game-goals{gap:10px;margin:0;padding-inline-start:20px;display:grid}.game-goal{border:1px solid var(--border);border-radius:8px;gap:8px;padding:10px;display:grid}.floating-window{z-index:9;background:var(--card);border:1px solid var(--border);border-radius:10px;flex-direction:column;max-height:60vh;display:flex;position:fixed;box-shadow:0 6px 20px #0003}.floating-window-bar{border-bottom:1px solid var(--border);cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;align-items:center;gap:8px;padding:6px 10px;display:flex}.floating-window-bar:active{cursor:grabbing}.floating-window-bar 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12px;padding:0;list-style:none;display:grid}@media (width<=520px){.group-cards{grid-template-columns:1fr}}.group-toolbar{flex-wrap:wrap;align-items:end;gap:12px;margin:8px 0 12px;display:flex}.group-toolbar .grow{flex:1;min-width:180px}.group-count{padding-bottom:6px}.group-card{text-align:center;background:var(--group-bg);border:2px solid var(--group-accent);color:#1f2937;border-radius:16px;flex-direction:column;align-items:center;gap:4px;padding:14px 12px 12px;display:flex}.group-card-icon{font-size:3rem;line-height:1.1}.group-card-name{margin:4px 0 0;font-size:1.1rem}.group-card-count{margin:0;font-weight:600}.group-card-details{margin:0;font-size:.8rem}.group-card-actions{flex-wrap:wrap;justify-content:center;gap:6px;margin-top:auto;padding-top:8px;display:flex}.style-picker{border:none;margin:0;padding:0}.icon-grid,.color-grid{flex-wrap:wrap;gap:6px;display:flex}.icon-choice{border:2px solid var(--border);background:#fff;border-radius:10px;width:44px;height:44px;padding:0;font-size:1.5rem;line-height:1}.color-choice{background:var(--group-bg);border:3px solid var(--group-accent);border-radius:50%;width:36px;height:36px;padding:0}.icon-choice.selected,.color-choice.selected{outline-offset:2px;outline:3px solid #1f2937}.board-scroll{overflow-x:auto}.board-scroll .board th,.board-scroll .board td{white-space:nowrap}.board:not(.org-table) .board-actions{flex-wrap:wrap;align-items:flex-start;display:flex}.student-import{border:1px solid var(--border);border-radius:12px;margin-top:16px;padding:12px 16px}.import-preview tr.import-invalid td{background:var(--danger-bg)}.import-preview tr.import-duplicate td{background:var(--hint)}.icon-password{justify-items:center;gap:16px;display:grid}.icon-slots{align-items:center;gap:10px;display:flex}.icon-slot{border:2px dashed 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var(--primary)}.drag-handle{cursor:grab;color:var(--muted);-webkit-user-select:none;user-select:none;font-weight:700}.hint-number{min-width:1.5em;font-weight:700}.hint-condition{border:1px solid var(--border);color:var(--muted);white-space:nowrap;cursor:help;border-radius:999px;padding:.1em .5em;font-size:.75rem}.hint-condition.has{color:#1f7a45;border-color:currentColor}.hint-player{background:#000;border:none;border-radius:6px;width:160px;height:90px}span.hint-player{color:#fff;justify-content:center;align-items:center;font-size:.8rem;display:inline-flex}.hint-title{flex:1;min-width:160px}.hint-actions{gap:4px;display:flex}.hints-editor .upload input[type=file]{margin-inline-start:8px}.button-like{border:1px solid var(--primary);color:var(--primary);cursor:pointer;border-radius:8px;padding:6px 12px;font-weight:600;display:inline-block}.help-question{margin:0 0 10px;font-weight:700}.help-teacher-note{background:var(--hint);border-radius:8px;margin:0 0 12px;padding:8px 10px}.help-options{gap:8px;display:grid}.help-options button{flex-direction:column;align-items:center;gap:2px;font-size:1.05rem;display:flex}.help-reason{font-size:.8rem;font-weight:400}.help-options button:disabled{opacity:1;color:#6b7280;cursor:not-allowed;background:#eef0f3;border:1px dashed #c4c9d1}.help-options button:disabled .help-reason{color:#4b5563}.hints-window{display:grid}.hint-player.loop{aspect-ratio:16/9;border-radius:0;width:100%;height:auto;display:block}.hints-nav{justify-content:space-between;padding:8px 10px;display:flex}.hint-stage{position:relative}.hint-celebration{color:#1f7a45;text-align:center;background:#e5f6eaeb;place-items:center;padding:12px;font-size:1.3rem;font-weight:700;display:grid;position:absolute;inset:0}.hints-all-done{text-align:center;color:#1f7a45;justify-items:center;gap:10px;padding:16px;font-weight:600}.mistake-window{gap:8px;max-height:60vh;padding:10px;display:grid;overflow-y:auto}.mistake-window p,.mistake-group h4{margin:0}.mistake-group ul,.mistake-window>ul{gap:4px;margin:4px 0 0;padding-inline-start:18px;display:grid}.mistake-kind{font-weight:700}.mistake.replace .mistake-kind{color:#7a4300}.mistake.remove .mistake-kind{color:var(--danger)}.mistake.add .mistake-kind{color:#1b6e36}.mistake-code{background:var(--hint);border-radius:4px;padding:0 4px;font-weight:600}.import-actions{flex-wrap:wrap}.import-report{border:1px solid var(--border);background:#fff;border-radius:8px;margin-top:10px;padding:10px 12px}.import-report h3{margin:0 0 6px}.import-report ul{margin:0;padding-inline-start:20px}.step-videos-table input[type=url]{width:100%;min-width:16em}.step-videos-table tr.row-bad td{background:#fdecec}.step-videos-table tr.row-ok td{background:#e5f6ea}.video-status{font-weight:600}.video-status.same{color:var(--muted)}.speak-button{cursor:pointer;vertical-align:middle;background:0 0;border:none;margin-inline-start:6px;padding:0 4px;font-size:1.05em;line-height:1}.speak-button:hover,.speak-button:focus-visible{background:#eef3ff;border-radius:6px}.task-card{align-items:center;display:flex}.read-aloud-export{justify-items:start;gap:6px;margin-bottom:10px;display:grid}.stat-cards{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:0 0 20px;padding:0;list-style:none;display:grid}.stat-card{box-sizing:border-box;text-align:start;width:100%;height:100%;color:var(--text);font:inherit;border:1px solid var(--border);background:#fff;border-radius:14px;grid-template-columns:1fr auto;align-items:center;column-gap:8px;padding:14px 16px;display:grid;box-shadow:0 1px 3px #1c22330f}.stat-card.clickable{cursor:pointer}.stat-card.clickable:hover{border-color:#3b82f6;box-shadow:0 2px 8px #3b82f62e}.stat-icon{grid-area:1/2/span 2;font-size:1.8rem}.stat-number{color:var(--text);grid-column:1;font-size:2.2rem;font-weight:800;line-height:1.1}.stat-label{grid-column:1;font-weight:600}.stat-note{color:var(--muted);grid-column:1/span 2;font-size:.8rem}.attention-panel{border:1px solid var(--border);background:#fff;border-radius:14px;padding:14px 16px}.attention-panel h2{margin:0 0 10px;font-size:1.15rem}.attention-empty{color:#1f7a45;background:#e5f6ea;border-radius:10px;margin:0;padding:12px;font-weight:600}.attention-list{gap:8px;margin:0;padding:0;list-style:none;display:grid}.attention-row{text-align:start;width:100%;color:var(--text);border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:12px;align-items:center;gap:12px;padding:10px 12px;display:flex}.attention-row:hover{background:#f7f9fd;border-color:#c9d3e6}.attention-mark{color:#d64545;background:#fde4e4;border-radius:50%;flex:none;place-items:center;width:32px;height:32px;font-weight:800;display:grid}.attention-main{flex:1;gap:2px;display:grid}.attention-detail{color:var(--muted);font-size:.85rem}.attention-wait{color:#b4610f;background:#fdeedd;border-radius:999px;flex:none;padding:3px 10px;font-size:.85rem;font-weight:600}.attention-go{color:var(--muted);flex:none;font-size:1.3rem}.board-focus{background:#e8f1fd;border-radius:10px;flex-wrap:wrap;align-items:center;gap:8px;margin:8px 0;padding:8px 12px;display:flex}.teacher-nav{border:1px solid var(--border);background:#fff;border-radius:14px;flex-wrap:wrap;align-items:center;gap:6px;margin:0 0 12px;padding:6px;display:flex}.teacher-nav-link{color:var(--text);background:0 0;border:none;border-radius:10px;padding:8px 16px;font-weight:600}.teacher-nav-link:hover{background:#f1f5fb}.teacher-nav-link.current{color:#2f6fed;background:#e8f1fd}.teacher-nav-side{align-items:center;gap:12px;margin-inline-start:auto;padding-inline:8px;display:flex}.teacher-nav-settings{color:var(--muted);font-size:.8rem}.teacher-nav-settings.current{color:var(--text);font-weight:600}.badge.draft-badge{color:#7a5200;background:#fff4d6}.badge.review-badge{color:#7a5200;background:#fff4d6;margin-inline-start:8px;font-size:.85em}.step-review,.publish-section,.skeleton-plan{background:#fffaf0;border:1px solid #e6c46a;border-radius:8px;margin:10px 0;padding:10px 12px}.publish-section h2{font-size:1.1rem}.first-view-video{z-index:100;background:#0a0c14f0;flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:16px;display:flex;position:fixed;inset:0}.first-view-video.first-view-closing{background:0 0;transition:background .3s}.first-view-video.first-view-closing .first-view-heading{visibility:hidden}.first-view-heading{color:#fff;margin:0;font-size:1.1rem;font-weight:600}.first-view-box{width:min(100%,177.778vh - 248.889px)}.first-view-box .video-frame{border-radius:8px;overflow:hidden}.first-view-fault{color:#fff;align-items:center;gap:12px;display:flex}.first-view-fault p{margin:0}.invite-page{max-width:480px}.invite-form{gap:12px;display:grid}.invite-form label{gap:4px;font-weight:600;display:grid}.staff-signin{max-width:480px}.totp-secret{letter-spacing:.08em;-webkit-user-select:all;user-select:all;background:#f3f4f8;border-radius:8px;margin:8px 0;padding:8px 12px;font-family:ui-monospace,Consolas,monospace;font-size:1.15em}.org-choices{gap:8px;margin-bottom:12px;display:grid}.staff-bar{background:var(--card);border:1px solid var(--border);border-radius:8px;flex-wrap:wrap;align-items:center;gap:12px;margin:0 auto 8px;padding:6px 12px;display:flex}.staff-bar-side{gap:12px;margin-inline-start:auto;display:flex}.staff-dev-note{color:#7a5200;background:#fff4d6;border-radius:999px;padding:2px 10px;font-size:.85rem;font-weight:600}.staff-seats{margin:0 0 12px;padding-inline-start:20px}.staff-full{color:var(--danger);font-weight:600}.staff-reminder{background:var(--hint);border:1px solid #f0d58a;border-radius:10px;margin:12px 0;padding:10px 14px}.staff-reminder ul{margin:6px 0 0}.staff-table td{vertical-align:top}.staff-row-off td{color:var(--muted)}.staff-actions{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.staff-online{color:#1b6b34;background:#e3f6e8;border-radius:999px;padding:2px 10px;font-weight:600}.danger-link{color:var(--danger)}.staff-strong-warning{background:var(--danger-bg);border:1px solid var(--danger);border-radius:10px;margin:10px 0;padding:10px 14px}.staff-strong-warning input{width:100%;margin-top:6px;display:block}.staff-invite-link{background:var(--placeholder);border-radius:10px;margin:8px 0 16px;padding:10px 14px}.import-mapping{border:1px solid var(--border);border-radius:10px;margin:12px 0;padding:10px 14px}.import-mapping select{max-width:100%}.import-class-mode{border:none;gap:4px;margin:10px 0;padding:0;display:grid}.import-class-mode legend{margin-bottom:4px;font-weight:600}.import-groups{background:var(--placeholder);border-radius:10px;margin:8px 0 12px;padding:8px 12px}.import-groups ul{margin:4px 0 0}.card.center>.link-button{margin:16px auto 0;display:block}.handoff-picker{border:1px dashed var(--border);border-radius:10px;margin:8px 0 12px;padding:8px 12px}.handoff-files{gap:4px;margin:6px 0 0;padding-inline-start:18px;display:grid}.move-group{margin:8px 0;display:block}.left-students{border:1px solid var(--border);border-radius:10px;margin-top:16px;padding:8px 12px}.left-students summary{cursor:pointer;font-weight:600}.import-decision{max-width:100%;margin-top:4px;display:block}.project-row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.project-row .project-item{flex:260px;width:auto}.project-actions{gap:8px;display:flex}.archived-projects{border:1px solid var(--border);border-radius:10px;margin-top:16px;padding:8px 12px}.archived-projects summary{cursor:pointer;font-weight:600}.badge.archived-badge{background:var(--border);color:var(--text);margin-inline-start:8px}.wrong-sprite-flash{pointer-events:none;z-index:60;flex-direction:column;justify-content:center;align-items:center;animation:2s ease-out forwards wrong-sprite-fade;display:flex;position:fixed;inset:0}.wrong-sprite-x{color:#d93025;text-shadow:0 4px 16px #00000040;font-size:min(40vw,260px);line-height:1}.wrong-sprite-flash p{background:var(--card);color:var(--text);text-align:center;border-radius:12px;margin:8px 16px 0;padding:10px 18px;font-size:1.5rem;font-weight:700;box-shadow:0 4px 16px #0003}@keyframes wrong-sprite-fade{0%,80%{opacity:1}to{opacity:0}}.sprite-hint{padding:12px}.sprite-hint-title{font-size:1.25rem;font-weight:700}.group-lesson{flex-direction:column;gap:6px;margin:6px 0;display:flex}.lesson-open{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.lesson-code{letter-spacing:4px;font-size:2rem}.group-link,.new-group-link{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.new-group-link input{direction:ltr;flex:220px}.home-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;display:flex}.notice{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:8px 12px}.lesson-wait{border:3px solid var(--primary);padding:32px 20px}.lesson-wait-icon{font-size:5rem;line-height:1;animation:2.4s ease-in-out infinite lesson-wait-turn}.lesson-wait-title{margin:12px 0 8px;font-size:2.2rem;font-weight:700}.lesson-wait-text{max-width:32ch;margin-inline:auto;font-size:1.4rem}.lesson-wait-dots{justify-content:center;gap:10px;margin-top:16px;display:flex}.lesson-wait-dots span{background:var(--primary);border-radius:50%;width:14px;height:14px;animation:1.2s ease-in-out infinite lesson-wait-dot}.lesson-wait-dots span:nth-child(2){animation-delay:.2s}.lesson-wait-dots span:nth-child(3){animation-delay:.4s}@keyframes lesson-wait-turn{0%,40%{transform:rotate(0)}50%,90%{transform:rotate(180deg)}to{transform:rotate(360deg)}}@keyframes lesson-wait-dot{0%,to{opacity:.3;transform:scale(.8)}50%{opacity:1;transform:scale(1.1)}}@media (prefers-reduced-motion:reduce){.lesson-wait-icon,.lesson-wait-dots span{animation:none}}.wrong-category-tip{z-index:55;background:var(--card);max-width:min(560px,100vw - 32px);color:var(--text);border:3px solid var(--category-color,var(--primary));border-radius:14px;align-items:center;gap:10px;padding:10px 14px;display:flex;position:fixed;top:64px;left:50%;transform:translate(-50%);box-shadow:0 6px 20px #0003}.wrong-category-tip p{margin:0;font-size:1.15rem;font-weight:600}.wrong-category-dot{background:var(--category-color,var(--primary));border-radius:50%;flex:none;width:22px;height:22px}.wrong-category-tip.category-motion{--category-color:#4c97ff}.wrong-category-tip.category-looks{--category-color:#96f}.wrong-category-tip.category-sound{--category-color:#cf63cf}.wrong-category-tip.category-events{--category-color:#ffbf00}.wrong-category-tip.category-control{--category-color:#ffab19}.wrong-category-tip.category-sensing{--category-color:#5cb1d6}.wrong-category-tip.category-operators{--category-color:#59c059}.wrong-category-tip.category-variables{--category-color:#ff8c1a}.wrong-category-tip.category-myblocks{--category-color:#ff6680}