:root{font-family:"PingFang SC","Microsoft YaHei",sans-serif;color:#203552;background:#f3f7fc;font-size:15px;letter-spacing:0;--blue:#2878ed;--line:#d9e4f0;--muted:#73849b}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);background:white;color:#344c69;border-radius:7px;min-height:42px;padding:9px 15px;display:inline-flex;align-items:center;justify-content:center;gap:7px;font-weight:600}button:hover{border-color:#8fb8ef;background:#f4f9ff}button:disabled{opacity:.5;cursor:default}button.primary,.tabs button.active{background:var(--blue);color:white;border-color:var(--blue)}button.danger{color:#d54863;border-color:#f1c7d0}button.icon{width:42px;padding:9px;flex-shrink:0}svg.lucide{width:18px;height:18px;flex-shrink:0}input,select{min-height:44px;border:1px solid #ccd9e8;border-radius:6px;background:white;padding:9px 12px;color:#203552;max-width:100%}input:focus,button:focus-visible,select:focus{outline:3px solid #91c7ff;outline-offset:2px}a{color:#2671d8;text-decoration:none}h1,h2,h3,p{margin:0}h1{font-size:26px}h2{font-size:19px}h3{font-size:15px}.muted{color:var(--muted)}.small{font-size:13px}.header{background:#fff;border-bottom:1px solid var(--line);padding:18px 28px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:13px}.brand-mark{color:#1679df;background:#e5f5ff;width:44px;height:44px;display:grid;place-items:center;border-radius:8px}.brand-mark 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button{width:100%;margin-top:6px}.login-switch{display:block;text-align:center;margin-top:20px;font-size:13px}.error{color:#d3475f;font-size:13px;line-height:1.6;margin:10px 0}.lesson-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:15px}.lesson-heading p{margin-top:8px;color:var(--muted);line-height:1.6}.workspace{display:grid;grid-template-columns:285px minmax(0,1fr);min-height:560px;gap:20px}.plan-panel{border-right:1px solid var(--line);padding-right:20px}.layer{margin-bottom:22px}.layer h3{margin-bottom:10px}.plan-grid{display:grid;gap:5px;width:max-content;max-width:100%}.cell{width:55px;height:55px;padding:0;border-radius:4px;color:#8192aa;background:white;min-height:0}.cell.filled{background:#d7eeff;color:#1779cc;border-color:#82c9f2;font-weight:700}.front{color:#8495aa;font-size:12px;text-align:center;margin-top:7px}.scene-wrap{background:linear-gradient(#f7fcff,#e9f3fc);position:relative;min-width:0;height:560px;overflow:hidden;border:1px solid #d5e5f1;border-radius:8px}.scene-wrap canvas{display:block;width:100%;height:100%;touch-action:none}.scene-tools{position:absolute;top:14px;left:14px;right:14px;display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;z-index:1}.scene-tools .actions{gap:6px}.scene-tools button{background:#ffffffed}.scene-tools 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auto;gap:9px;align-items:end}.inline-form .field{margin:10px 0}.inline-form button{margin-bottom:10px}dialog{border:1px solid var(--line);border-radius:8px;padding:25px;width:min(950px,calc(100% - 32px));max-height:90dvh;overflow:auto;color:#203552}dialog::backdrop{background:#152d4c66;backdrop-filter:blur(3px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.dialog-work .scene-wrap{height:430px}.dialog-work .workspace{min-height:430px}.dialog-work .plan-panel{max-height:430px;overflow:auto}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#233e5b;color:white;border-radius:7px;padding:12px 20px;z-index:10;display:none;max-width:90%;box-shadow:0 5px 25px #20355222}#toast.show{display:block}.notice{border:1px solid #b9d9fa;background:#eef7ff;padding:12px 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:root .access-links{display:flex;flex-wrap:wrap;gap:25px;margin-top:20px}.access-links section{text-align:center;min-width:200px}.access-links a{overflow-wrap:anywhere}