:root{--ink:#22362f;--muted:#77877f;--green:#25654c;--line:#dce5df;--paper:#f5f7f3;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}button,input,select,textarea{font:inherit}button,a,.file-button{cursor:pointer}button{background:#fff;border:1px solid var(--line);color:var(--ink);border-radius:7px;padding:8px 13px}button:hover{background:#eef3ee}button:disabled{opacity:.5;cursor:default}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}button:focus-visible,a:focus-visible,.file-button:focus-within{outline:3px solid #7bb8a2;outline-offset:3px}input,select{border:1px solid var(--line);border-radius:7px;padding:9px 11px;background:#fff;color:var(--ink);min-width:0}input:focus,select:focus{outline:2px solid #aad0ba;outline-offset:1px}label{display:block}header{height:76px;background:#fff;border-bottom:1px solid var(--line);padding:0 4%;display:flex;justify-content:space-between;align-items:center}.brand{font:italic 700 27px Georgia,serif;color:var(--green);display:flex;align-items:center;gap:13px}.brand span{font:700 21px -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;letter-spacing:-.5px}nav{display:flex;align-items:center;gap:22px;font-size:14px}nav button{border:0;background:none}main{max-width:1900px;margin:auto;padding:30px 3% 20px}.heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.eyebrow{color:#8a988a;font-size:11px;letter-spacing:2px;margin:0 0 6px}h1{font-size:29px;letter-spacing:-1px;font-weight:650;margin:0}h2{font-size:15px;margin:0}h3{font-size:18px}.subtitle{color:var(--muted);margin:5px 0}.primary{background:var(--green);border-color:var(--green);color:white;font-weight:600;padding:10px 17px}.primary:hover{background:#1c513c}.notice{font-size:13px;border:1px solid #dce6d5;background:#edf3e8;border-radius:8px;color:#5b725a;margin:0 0 19px;padding:9px 13px}.error{color:#aa3d37;background:#fff0ed;border:1px solid #efc9c3;border-radius:7px;padding:11px 14px}.studio{display:grid;grid-template-columns:205px minmax(280px,1fr) minmax(280px,1fr);min-height:610px;border:1px solid var(--line);background:white;border-radius:12px;overflow:hidden;box-shadow:0 5px 30px #263c2f04}aside{background:#f9fbf7;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:19px 13px}.aside-title{display:flex;justify-content:space-between;align-items:center;padding:0 5px 15px}.aside-title button{border:0;background:none;font-size:22px;padding:0 4px;color:#85958c}.doc-item{width:100%;text-align:left;display:block;border:1px solid transparent;background:none;padding:12px 11px;border-radius:7px;margin:0 0 5px;overflow-wrap:anywhere}.doc-item strong{display:block;font-size:14px;font-weight:550}.doc-item small{display:block;color:#8a988f;margin-top:4px;font-size:11px}.doc-item.active{border-color:#cfded1;background:#eaf1e8;color:#286346}.empty-list{color:#8b998f;padding:20px 10px;font-size:13px}.aside-bottom{margin-top:auto;padding-top:35px;font-size:11px;color:#8c9a92}.aside-bottom button{font-size:12px;background:none}.editor-pane{border-right:1px solid var(--line);display:flex;flex-direction:column;min-width:0}.document-bar{display:flex;align-items:center;gap:10px;padding:17px;border-bottom:1px solid var(--line)}.title-label{flex:1;font-size:11px;color:#86958b;min-width:0}.title-label input{display:block;border:none;font-size:16px;font-weight:600;width:100%;padding:3px 0;margin:0}.document-bar select{font-size:11px;max-width:145px;padding:7px}.editor-toolbar{display:flex;justify-content:space-between;gap:8px;align-items:center;padding:10px 17px;background:#fafbf9;border-bottom:1px solid #e9eee8}.editor-toolbar>span{font:11px ui-monospace,monospace;letter-spacing:1px;color:#8b9b90}.editor-toolbar>div{display:flex;gap:12px;align-items:center}.editor-toolbar button,.file-button{font-size:12px;border:none;padding:0;background:none;color:#637c6d}.editor-toolbar #save{color:var(--green);font-weight:650}#source{display:block;flex:1;resize:vertical;border:none;outline:none;width:100%;min-height:415px;padding:23px 20px;font:13px/1.9 "Cascadia Code",Consolas,"SFMono-Regular",monospace;tab-size:2;background:#fff;color:#3e5751;white-space:pre;overflow:auto}#source:focus{box-shadow:inset 3px 0 #95bca5}.editor-bottom{display:flex;justify-content:space-between;gap:10px;padding:11px 17px;font-size:11px;color:#84958b;border-top:1px solid var(--line)}.preview-pane{background:#edf1eb;display:flex;flex-direction:column;min-width:0}.preview-bar{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:18px;background:#fafbf9;border-bottom:1px solid var(--line)}.preview-bar h2{color:#607269;font-size:13px}.preview-bar button{font-size:13px;padding:9px 13px}.preview-bar button span{font-size:10px;opacity:.6;margin-left:9px}#preview-empty{flex:1;min-height:405px;display:flex;align-items:center;justify-content:center;flex-direction:column;color:#88988a;padding:25px;text-align:center}#preview-empty h3{font-size:16px;font-weight:500;margin:25px 0 0;color:#6a806f}#preview-empty p{font-size:13px;margin-top:8px}.paper-icon{width:86px;height:115px;border:1px solid #cad8c9;background:#fafcf8;box-shadow:5px 5px #dfe7dc;border-radius:3px;text-align:left;padding:15px 16px;font:25px Georgia,serif;color:#9eb39b}.paper-icon span{display:block;font:23px/1.1 monospace;letter-spacing:4px;color:#d4dfd0}#preview{width:100%;flex:1;min-height:480px;border:none}.preview-footer{display:flex;justify-content:space-between;gap:12px;padding:12px 17px;font-size:11px;color:#708671;border-top:1px solid #dce5d9}.preview-footer a{font-size:12px}details{background:#f7faf5;border-top:1px solid #dce5d9;padding:11px 17px;color:#738370;font-size:12px}summary{cursor:pointer}pre{font:11px/1.7 monospace;max-height:210px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;color:#576151}footer{font-size:11px;color:#8e9c92;display:flex;justify-content:space-between;gap:15px;margin-top:18px}dialog{border:1px solid var(--line);border-radius:13px;padding:28px;width:min(440px,calc(100% - 28px));color:var(--ink);box-shadow:0 20px 80px #17392425}dialog::backdrop{background:#172c2359;backdrop-filter:blur(3px)}dialog h2{font-size:23px;margin-bottom:9px}dialog p{font-size:14px;color:var(--muted)}dialog label{margin:18px 0 6px;font-size:13px}dialog input,dialog select{display:block;width:100%;margin-top:7px}.dialog-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:27px}#login-form>button{width:100%;margin-top:20px}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}body.locked main{visibility:hidden}@media(max-width:1150px){.studio{grid-template-columns:165px minmax(250px,1fr) minmax(240px,1fr)}.preview-bar button span{display:none}.document-bar{flex-wrap:wrap}.document-bar .title-label{min-width:130px}.editor-toolbar{padding:10px}.editor-toolbar>div{gap:8px}}@media(max-width:850px){.studio{grid-template-columns:170px minmax(0,1fr)}.preview-pane{grid-column:1/-1;border-top:1px solid var(--line)}.editor-pane{border-right:0}.studio{min-height:0}#preview-empty{min-height:250px}#preview{min-height:600px}#source{min-height:400px}.heading{margin-bottom:15px}footer{flex-direction:column;gap:3px}}@media(max-width:540px){header{height:65px;padding:0 5%}.brand span{font-size:18px}nav{gap:10px;font-size:12px}main{padding:25px 4% 18px}h1{font-size:24px}.eyebrow{font-size:9px;letter-spacing:1px}.subtitle{font-size:12px}.heading{align-items:flex-start}.heading>.primary{font-size:12px;padding:10px;white-space:nowrap;margin-top:20px}.studio{display:flex;flex-direction:column}aside{border-right:0;border-bottom:1px solid var(--line);padding:12px}.aside-title{padding-bottom:4px}#documents{display:flex;gap:5px;overflow:auto}.doc-item{min-width:150px;width:auto}.aside-bottom{padding-top:5px}.aside-bottom p{display:none}.aside-bottom button{font-size:11px;padding:4px 8px}.document-bar{padding:14px}.document-bar .title-label{min-width:90px}#source{font-size:12px;padding:17px 13px;min-height:360px}.preview-bar{padding:13px}#preview{min-height:520px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* App-owned PDF preview and immutable history workspace. */
#preview{display:flex;flex-direction:column;min-height:480px;height:600px;flex:1;background:#f7f9f5;overflow:hidden}.pdf-tools{display:flex;align-items:center;justify-content:space-between;padding:8px 13px;border-bottom:1px solid var(--line);background:#fff;gap:10px}.pdf-tools>div{display:flex;gap:10px;align-items:center}.pdf-tools button{padding:2px 11px;font-size:20px}.pdf-tools select{font-size:12px;padding:5px 8px}#pdf-page{font-size:12px;color:#607269}#pdf-message{font-size:12px;margin:0;padding:0 12px;color:#607269}#pdf-message:not(:empty){padding:8px 12px}#pdf-scroll{flex:1;min-height:0;overflow:auto;padding:14px;background:#f0f4ee}#pdf-canvas-holder{width:max-content;min-width:100%;display:flex;justify-content:center}#pdf-canvas-holder canvas{display:block;background:white;box-shadow:0 2px 12px #233b2914}.editor-toolbar>div{flex-wrap:wrap}.editor-toolbar{align-items:flex-start}
#history-dialog{width:min(1050px,calc(100% - 24px));max-height:90dvh;overflow:auto;padding:24px}#history-dialog h2{margin:0}.history-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:15px}.history-heading p{margin:5px 0}.history-heading>button{font-size:22px}.history-selectors{display:grid;grid-template-columns:1fr 1fr;gap:16px}.history-actions{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 8px}#history-dialog pre{max-height:260px;white-space:pre-wrap;font-size:12px}#history-dialog textarea{width:100%;min-height:240px;resize:vertical;box-sizing:border-box;font:12px/1.7 Consolas,monospace;white-space:pre;overflow:auto;padding:12px;border:1px solid var(--line);border-radius:7px;background:white;color:#294536}.branch-row{display:flex;align-items:end;gap:12px;border-top:1px solid var(--line);padding:10px 0 20px}.branch-row label{flex:1;margin-bottom:0}.branch-row button{white-space:nowrap}.history-help{font-size:12px!important}#history-proposal{border-top:2px solid #c5dac9;margin-top:16px;padding-top:12px}.history-confirm{display:flex;align-items:center;gap:8px!important;margin:15px 0!important}.history-confirm input{display:inline-block;width:auto;margin:0}#history-dialog [disabled]{opacity:.5}#history-result{min-height:330px!important}
@media(max-width:650px){.history-selectors{grid-template-columns:1fr;gap:0}.history-actions{flex-direction:column}.branch-row{align-items:stretch;flex-direction:column}#history-dialog{padding:17px}.preview-footer{flex-wrap:wrap}#preview{height:600px;min-height:440px}}