:root{--ink:#20213a;--muted:#777991;--paper:#f7f8fc;--card:#fff;--indigo:#4f46e5;--indigo-soft:#eef2ff;--yellow:#facc15;--line:#312e811f}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);margin:0;font-family:Inter,PingFang SC,Microsoft YaHei,Arial,sans-serif}button,input,textarea{font:inherit;color:inherit}button{cursor:pointer}main{min-height:100vh}.topbar{border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);z-index:10;background:#fffffff0;justify-content:space-between;align-items:center;height:64px;padding:0 4vw;display:flex;position:sticky;top:0}.brand{color:var(--ink);align-items:center;gap:10px;text-decoration:none;display:flex}.brand i{background:var(--indigo);color:#fff;border-radius:10px;place-items:center;width:34px;height:34px;font-size:13px;font-style:normal;font-weight:900;display:grid}.brand b{letter-spacing:-.04em;font-size:18px}.top-actions{gap:8px;display:flex}.top-actions button,.save-actions button{border:0;border-radius:10px;padding:9px 14px;font-size:12px;font-weight:800}.quiet-button{color:var(--muted);background:0 0}.quiet-button:hover{background:var(--indigo-soft);color:var(--indigo)}.quiet-button:disabled{opacity:.4}.new-button,.save-button{background:var(--indigo);color:#fff}.workspace{grid-template-columns:290px minmax(0,1fr);gap:18px;min-height:calc(100vh - 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58px);padding:12px}.library{max-height:250px;position:static}.editor-shell{min-height:620px}.document{min-height:560px;padding:28px 21px 48px}.document-meta{gap:10px}.document-meta input:first-child{width:120px}.title-input{font-size:29px}.content-input{min-height:430px;font-size:15px}.editor-toolbar{padding:0 10px}.top-actions button{padding:8px 11px}}