.mj-lesson{box-sizing:border-box;width:min(740px,calc(100vw - 28px));max-width:none;max-height:calc(100dvh - 28px);margin:auto;padding:0;border:1px solid #d6dece;border-radius:20px;background:#fafbf5;color:#203c33;box-shadow:0 24px 80px #102d2440;font:14px/1.65 "Microsoft YaHei","PingFang SC",system-ui,sans-serif;text-align:left}
.mj-lesson[open]{display:flex;flex-direction:column}.mj-lesson *{box-sizing:border-box}.mj-lesson::backdrop{background:#122b2480;backdrop-filter:blur(4px)}
.mj-lesson-header,.mj-lesson-footer{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 26px}.mj-lesson-header{border-bottom:1px solid #e1e6d9}.mj-lesson h2{font:600 24px/1.35 "Microsoft YaHei","PingFang SC",system-ui,sans-serif;margin:3px 0 0;letter-spacing:0}.mj-lesson-eyebrow{font-size:11px;color:#88713e;letter-spacing:1px;margin:0}.mj-lesson button{font:inherit;touch-action:manipulation;cursor:pointer}.mj-lesson button:focus-visible{outline:3px solid #b9954b;outline-offset:4px}.mj-lesson button:disabled{cursor:default;opacity:.5}.mj-lesson-close{flex-shrink:0;border:0;background:#e8eedf;color:#315a45;border-radius:50%;width:34px;height:34px;font-size:25px!important;line-height:1!important;padding:0}.mj-lesson-scroll{overflow:auto;overscroll-behavior:contain;min-height:0;padding:16px 26px 6px}.mj-lesson-scope{font-size:11px;color:#6d7b69;margin:0 0 13px}.mj-lesson-progress{list-style:none;display:flex;gap:8px;padding:0;margin:0 0 16px}.mj-lesson-progress li{display:grid;place-items:center;border:1px solid #d4ddcb;border-radius:50%;width:27px;height:27px;color:#76836d;font-size:12px}.mj-lesson-progress .current{background:#245e49;border-color:#245e49;color:#fffbea}.mj-lesson-progress .done{background:#e1ead6;color:#30563d}.mj-lesson-detail{font-size:13px;line-height:1.85;margin:0 0 12px;color:#5d705c}.mj-lesson-prompt{font-size:14px;font-weight:600;margin:0 0 13px}.mj-lesson-board{border:1px solid #c8d4c1;border-radius:13px;background:linear-gradient(135deg,#e5eddf,#eff3e6);padding:14px 18px 18px}.mj-lesson-counter{margin:0 0 12px;text-align:right;color:#557348;font-size:11px;font-variant-numeric:tabular-nums}.mj-lesson-zone{margin:0 0 14px}.mj-lesson-zone:last-child{margin-bottom:0}.mj-lesson-zone h3{font-size:11px;color:#5e7456;font-weight:500;margin:0 0 10px}.mj-lesson-tiles{display:flex;align-items:flex-end;flex-wrap:wrap;gap:7px;padding-bottom:4px;min-height:24px}.mj-lesson-tile{position:relative;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:46px;height:64px;border:1px solid #d2cbb3;border-radius:6px;padding:4px;background:linear-gradient(115deg,#fffef2,#eae6d4);box-shadow:0 3px 0 #c0bda3,0 5px 0 #5e8366,1px 7px 7px #2e4e3525;color:#224c3c;transition:transform .12s,box-shadow .12s}.mj-lesson-tile .face{width:100%;height:100%;display:block}.mj-lesson button.mj-lesson-tile:disabled{opacity:1}.mj-lesson-tile.selected{transform:translateY(-6px);outline:2px solid #ac8438;outline-offset:2px;box-shadow:0 3px 0 #c9b57d,0 5px 0 #5e8366,1px 9px 9px #2e4e3535}.mj-lesson-empty{color:#7c8b73;font-size:11px}.mj-lesson-incoming{display:flex;align-items:center;gap:24px;margin-bottom:14px;border-bottom:1px solid #c8d4c1;padding-bottom:10px}.mj-lesson-incoming .mj-lesson-zone{margin:0}.mj-lesson-primary,.mj-lesson-confirm{border:1px solid #245e49;border-radius:8px;background:#245e49;color:#fffbea;padding:10px 18px;font-weight:600!important;min-height:42px;white-space:nowrap}.mj-lesson-confirm{display:block;margin-top:15px;width:100%}.mj-lesson-primary:hover:not(:disabled),.mj-lesson-confirm:hover:not(:disabled){background:#1b4f3b}.mj-lesson-extras p{font-size:11px;color:#6d7b69;line-height:1.8;margin:12px 0 0}.mj-lesson-feedback{font-size:12px;line-height:1.8;min-height:43px;color:#315f42;margin:14px 0 0}.mj-lesson-feedback.error{color:#9c4937;background:none}.mj-lesson-footer{border-top:1px solid #e1e6d9;background:#fafbf5;padding-top:14px;padding-bottom:14px}.mj-lesson-navigation{display:flex;gap:14px;flex-wrap:wrap}.mj-lesson-text{border:0;background:none;padding:8px 0;color:#5b7254;font-size:12px!important;min-height:38px}.mj-lesson-text:hover{text-decoration:underline;text-underline-offset:3px}
@media(max-width:460px){.mj-lesson{width:calc(100vw - 16px);max-height:calc(100dvh - 16px);border-radius:14px}.mj-lesson-header{padding:16px}.mj-lesson h2{font-size:20px}.mj-lesson-scroll{padding:13px 16px 4px}.mj-lesson-board{padding:12px}.mj-lesson-tile{width:38px;height:54px;border-radius:5px;padding:3px}.mj-lesson-tiles{gap:6px}.mj-lesson-footer{padding:12px 16px;gap:8px}.mj-lesson-navigation{gap:10px}.mj-lesson-primary{padding:9px 13px;font-size:13px!important}.mj-lesson-detail{font-size:12px}.mj-lesson-prompt{font-size:13px}}
@media(max-width:359px){.mj-lesson-scroll{padding-left:12px;padding-right:12px}.mj-lesson-board{padding:10px}.mj-lesson-tile{width:34px;height:49px}.mj-lesson-tiles{gap:5px}.mj-lesson-navigation{gap:5px}.mj-lesson-text{font-size:11px!important}.mj-lesson-footer{padding-left:12px;padding-right:12px}}
@media(max-height:500px) and (min-width:600px){.mj-lesson-header{padding-top:10px;padding-bottom:10px}.mj-lesson h2{font-size:20px}.mj-lesson-footer{padding-top:8px;padding-bottom:8px}.mj-lesson-scroll{padding-top:10px}}
@media(prefers-reduced-motion:reduce){.mj-lesson-tile{transition:none}}.reduce-motion .mj-lesson-tile{transition:none}