:root{--bg:#f7f3ea;--panel:#fffdf9;--ink:#1d1d1d;--muted:#6f6f73;--accent:#f4b942;--accent-soft:#ffe9ae;--line:#e7dfd0;--green:#4ea66a;--moss:#4e6d53;--shadow:0 12px 25px rgba(54,46,22,.08)}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC","Segoe UI",sans-serif;padding:24px;line-height:1.65}button,input{font:inherit}button{cursor:pointer;min-height:44px}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--moss);outline-offset:4px}a{color:inherit;text-decoration:none}.app-shell{max-width:1200px;margin:auto;background:var(--panel);border:3px solid var(--ink);border-radius:24px;box-shadow:var(--shadow);padding:24px 30px}.topbar,.section-heading{display:flex;align-items:center;justify-content:space-between;gap:15px}.topbar{border-bottom:1px solid var(--line);padding-bottom:20px}.brand{display:flex;gap:12px;align-items:center}.brand-mark{font-size:32px;background:var(--accent);border:2px solid var(--ink);border-radius:13px;width:52px;text-align:center;box-shadow:3px 3px 0 var(--ink)}.brand small,.brand strong{display:block}.brand small{font-size:11px;color:var(--muted)}.brand strong{font-size:21px}#save-status{font-size:12px;color:var(--muted)}.hero{display:grid;grid-template-columns:1.3fr 1fr;align-items:center;gap:30px;padding:32px 12px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--moss);font-weight:bold}h1{font-size:42px;line-height:1.35;margin:10px 0;letter-spacing:1px}h1 span{background:linear-gradient(transparent 65%,var(--accent-soft) 65%)}.hero p{color:var(--muted);font-size:14px}.paper-art{max-width:360px;justify-self:center;transform:rotate(3deg);padding:22px;background:#fff6da;border:2px solid var(--ink);border-radius:15px;box-shadow:7px 7px 0 #e6dfcc;text-align:center}.paper-art div{border:2px solid var(--ink);border-radius:30px;padding:8px;background:white;margin:15px}.paper-art span:not(.art-label){font-size:12px;background:#e1efdf;border-radius:8px;padding:8px}.art-label{font-weight:bold;font-size:12px}.modes{display:flex;gap:8px;border-bottom:1px solid var(--line);padding-bottom:20px}.modes button{flex:1;border:2px solid var(--line);border-radius:12px;background:white;padding:10px;font-weight:bold}.modes button.active{border-color:var(--ink);background:var(--accent);box-shadow:0 3px 0 var(--ink)}.workspace{display:grid;grid-template-columns:310px minmax(0,1fr);gap:24px;padding-top:26px}.map-panel{padding:18px;background:#f4f5ed;border:1px solid #dce2d6;border-radius:18px;align-self:start;position:sticky;top:16px}h2{font-size:20px;margin:0}#progress{font-size:12px;color:var(--moss)}.muted{font-size:12px;color:var(--muted)}.tree-root{background:var(--moss);color:white;text-align:center;padding:13px;border-radius:12px;font-weight:bold;font-size:14px}.tree{margin:14px 0 14px 10px;border-left:2px solid #bbcdb7;padding-left:20px;display:grid;gap:9px}.node{position:relative;text-align:left;border:1px solid #cbd6c4;background:white;border-radius:10px;padding:10px 12px;font-size:14px}.node:before{content:"";position:absolute;left:-22px;top:50%;width:20px;border-top:2px solid #bbcdb7}.node small{display:block;color:var(--muted);font-size:11px}.node.active{border:2px solid var(--ink);background:var(--accent-soft)}.node.done .node-label:after{content:" ✓";color:var(--moss)}.paper-note{font-size:13px;color:#705b33;background:#fff1d3;border-radius:10px;padding:14px}.text-button{border:0;background:transparent;color:var(--muted);font-size:12px;margin-top:10px;text-decoration:underline}.editor{border:2px solid var(--ink);border-radius:18px;background:white;padding:26px;min-width:0}.tag{display:inline-block;background:#e1efdf;color:var(--moss);border-radius:6px;padding:3px 9px;font-size:11px;font-weight:bold}.editor h2{font-size:25px;margin:12px 0}.intro{color:var(--muted);font-size:14px}.budget{display:grid;gap:8px;margin:20px 0}.budget button{display:flex;justify-content:space-between;align-items:center;text-align:left;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px 14px}.budget small{color:var(--muted)}.primary,.secondary{padding:11px 18px;border:2px solid var(--ink);border-radius:10px;font-weight:bold}.primary{background:var(--accent);box-shadow:0 3px 0 var(--ink)}.secondary{background:white}.actions{display:flex;gap:10px;justify-content:space-between;margin-top:24px}.question{border:0;padding:0;margin:18px 0}.question legend{font-size:15px;font-weight:bold;margin-bottom:10px}.choices{display:flex;flex-wrap:wrap;gap:9px}.choice{border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:9px 13px}.choice[aria-pressed=true]{background:var(--accent-soft);border:2px solid var(--ink)}.input-label{display:block;margin:14px 0;font-size:14px}input{border:1px solid #bcb6a8;border-radius:8px;padding:9px;width:100%;margin-top:6px;background:var(--panel)}.hint,.example,.saved-material{padding:15px 18px;border-radius:12px;margin:18px 0;font-size:14px}.hint{background:#fff4d9;border:1px dashed #d8b45e}.example{background:#eef4ec;border:1px solid #d6e3d0}.example p{margin:8px 0}.example small{color:var(--moss)}.saved-material{background:var(--panel);border:1px solid var(--line)}.words{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.words span{background:white;border:1px solid #d6e3d0;border-radius:6px;padding:3px 9px;font-size:12px}.check{display:flex;gap:9px;align-items:flex-start;margin:15px 0;font-size:14px}.check input{width:18px;height:18px;margin:4px 0;flex:none}details{margin:18px 0;border:1px solid var(--line);border-radius:12px;padding:14px}summary{cursor:pointer;font-size:14px;font-weight:bold}.sample-body{white-space:pre-line;font-size:15px;line-height:2;text-indent:2em}.feedback{color:var(--moss);font-size:13px}.feedback.wrong{color:#a23f30}.writing-checks{background:#eef4ec;padding:16px;border-radius:12px}footer{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;margin-top:30px;padding-top:20px;border-top:1px solid var(--line)}@media(max-width:850px){body{padding:12px}.app-shell{padding:18px}.hero{grid-template-columns:1fr;padding:22px 0}.paper-art{display:none}h1{font-size:34px}.workspace{grid-template-columns:1fr}.map-panel{position:static}.tree{grid-template-columns:repeat(2,minmax(0,1fr))}.editor{padding:18px}#save-status{max-width:125px}.modes button{font-size:12px;padding:8px}footer{display:block}}@media print{body{padding:0;background:white}.app-shell{border:0;box-shadow:none}.hero,.modes,.actions,.text-button,.topbar,#save-status,footer{display:none}.workspace{display:block}.map-panel{position:static;break-inside:avoid}.editor{margin-top:20px;border:1px solid #ddd}.tree{grid-template-columns:repeat(2,1fr)}details>*{display:block!important}.check input{appearance:auto}}

.brand-mark{background:#a64432;color:#fffdf9}.editor{scroll-margin-top:20px}.node{overflow-wrap:anywhere}