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span{position:absolute;left:10px;bottom:10px;padding:4px 8px;border-radius:6px;background:#002c57d9;color:#fff;font-size:12px}.cover-editor.is-empty .cover-preview:before{content:"16:9";position:absolute;inset:0;display:grid;place-items:center;color:var(--muted);font-size:28px}.cover-focus-controls{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:520px}.cover-focus-controls input{padding:0!important}.danger-zone{margin-top:30px;border-color:#e1b8b8}.danger-zone form{display:inline-block;margin:6px 8px 0 0}.lesson-stepper{padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:#fff}.lesson-stepper span,.lesson-stepper strong{display:block}.lesson-stepper span{color:var(--muted);font-size:12px;text-transform:uppercase}.stage-next{margin-left:8px}.stage-back{min-height:44px;border:0;background:transparent;color:var(--muted);cursor:pointer}.lesson-stage[hidden]{display:none}.academy .piece-palette button[aria-pressed=true],.academy .setup-tools button[aria-pressed=true]{border-color:#b39625;background:#fff7cf;box-shadow:0 0 0 2px #ead788}.academy .setup-tool-delete[aria-pressed=true]{border-color:#bd5c5c;background:#fff0f0;box-shadow:0 0 0 2px #efc7c7}.piece-palette .palette-white{color:#fff;text-shadow:1px 0 #17344f,-1px 0 #17344f,0 1px #17344f,0 -1px #17344f}.piece-palette .palette-black{color:#17344f}.academy progress{appearance:none;border:0;border-radius:10px;overflow:hidden;background:#e8eef5}.academy progress::-webkit-progress-bar{background:#e8eef5}.academy progress::-webkit-progress-value{background:#bca138}.academy progress::-moz-progress-bar{background:#bca138}.chess-square.legal-move:after{content:"";position:absolute;width:26%;height:26%;border-radius:50%;background:#102b4061;pointer-events:none}.chess-square.legal-capture:after{content:"";position:absolute;inset:4%;border:4px solid rgba(16,43,64,.45);border-radius:50%;pointer-events:none}#lesson-exercises .board-layout{grid-template-columns:minmax(0,1fr)}#lesson-exercises .board-frame{max-width:520px}#lesson-exercises .board-tools:empty{display:none}.chess-square.last-move:not(.selected){box-shadow:inset 0 0 0 4px #d4b63c99}.exercise-notation{margin:12px 0;padding:10px 14px;border-radius:8px;background:#edf3f8;font-variant-numeric:tabular-nums;line-height:1.8}.exercise-notation:empty{display:none}.icon-button{min-width:38px;min-height:38px;padding:5px 10px;font:600 20px/1.1 system-ui,sans-serif}.icon-button:focus-visible{outline:3px solid #cead32;outline-offset:2px}.board-navigation{justify-content:center;gap:5px;margin-top:8px}.text-format-toolbar{display:flex;flex-wrap:wrap;gap:3px;padding:5px;border:1px solid #dbe4ee;border-radius:8px 8px 0 0;background:#f4f7fa}.text-format-toolbar .icon-button{border:0;background:transparent}.text-format-toolbar .icon-button:hover{background:#e0e9f2}.position-settings{padding:10px 0;border-bottom:1px solid 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