:root{color-scheme:dark;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#101419;color:#e9edf4;--muted:#95a4b8;--line:#2b3542;--accent:#ef754e}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}button,input,textarea,select{font:inherit;color:inherit}button,select{border:1px solid #3c4859;border-radius:7px;background:#1e2834;padding:8px 11px;font-size:12px}button{cursor:pointer}button:hover:enabled{border-color:var(--accent);background:#29323e}button:disabled{opacity:.4;cursor:default}button.primary{background:#e56843;border-color:#e56843;color:#101419;font-weight:750;padding:11px 16px}button:focus-visible,a:focus-visible,select:focus-visible,textarea:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}textarea{display:block;width:100%;resize:vertical;background:#101820;border:1px solid #384555;border-radius:8px;padding:12px;line-height:1.55;font-size:13px}label{font-size:12px;color:#acb9ca}label:has(textarea),label[for]{display:block;margin:0 0 8px}input[type=checkbox]{accent-color:var(--accent)}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 30px;border-bottom:1px solid var(--line)}.brand{font-size:16px;font-weight:850;letter-spacing:.05em}.brand span{color:var(--accent)}.topbar nav{display:flex;gap:22px;font-size:12px;color:var(--muted)}main{max-width:1760px;margin:auto;padding:26px 30px 80px}.intro{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;gap:16px}.intro h1{font-size:36px;letter-spacing:-.04em;margin:2px 0 4px}.intro h1 span{color:var(--accent)}.intro p:not(.eyebrow){color:var(--muted);font-size:14px;margin:0}.eyebrow{font-size:10px;letter-spacing:.14em;color:var(--accent);font-weight:650;margin:0 0 8px}.sandbox-label{font:10px/1.4 monospace;letter-spacing:.12em;color:#93b4a9;border:1px solid #36544c;border-radius:30px;padding:9px 13px;white-space:nowrap}.sandbox-label i{display:inline-block;background:#66b497;width:6px;height:6px;border-radius:50%;margin-right:5px}.toolbar{display:flex;align-items:center;gap:7px;flex-wrap:wrap}.toolbar label{display:flex;align-items:center;gap:8px}.spacer{flex:1}.status{min-height:20px;color:#abbacc;font-size:12px;margin:12px 0 18px;overflow-wrap:anywhere}.status.error{color:#ffaf91}.workbench{display:grid;grid-template-columns:330px minmax(0,1fr);gap:20px;align-items:start}.panel{background:#171e27;border:1px solid var(--line);border-radius:12px;min-width:0}.builder{padding:20px}.panel-heading h2{font-size:18px;line-height:1.35;margin:4px 0 16px}.chat{max-height:280px;overflow:auto;font-size:13px;line-height:1.6;color:#c1cbd8;overflow-wrap:anywhere}.chat-intro{color:var(--muted);padding:4px 0 12px}.chat-message{margin-bottom:14px;white-space:pre-wrap}.chat-message b{display:block;font-size:10px;color:var(--accent);letter-spacing:.08em;text-transform:uppercase;margin-bottom:3px}.chat-message.user{padding:10px;background:#222e3b;border-radius:8px}.suggestions{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 20px}.suggestions button{font-size:11px;background:transparent;padding:6px 9px;border-radius:20px}.form-actions{display:flex;gap:8px;margin:12px 0 18px}.settings{border-top:1px solid var(--line);padding:12px 0 0;margin-top:12px}.settings summary{font-size:12px;color:#b8c5d7}summary{cursor:pointer;font-weight:550}.muted{color:var(--muted);font-size:12px;line-height:1.6}.preview-panel{overflow:hidden}.preview-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 20px 12px;flex-wrap:wrap}.preview-toolbar .eyebrow{display:block;margin-bottom:4px}.preview-toolbar strong{font-size:12px;font-weight:500;color:#c9d4e2}.preview-actions{display:flex;gap:7px;flex-wrap:wrap}.preview-options{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:0 20px 16px;flex-wrap:wrap}.check{display:flex;align-items:center;gap:6px}.preview-options select{padding:4px}#lab-preview-wrap{padding:16px;background:#090e14;border-top:1px solid var(--line);min-height:700px;display:flex;justify-content:center}#lab-preview{display:block;width:100%;height:740px;border:1px solid #2d3b4b;border-radius:9px;background:#10151b;transition:width .2s}.preview-footer{display:flex;justify-content:space-between;gap:12px;padding:13px 20px;font-size:10px;color:var(--muted)}.advanced{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}.advanced .panel{padding:18px}.advanced summary{font-size:13px}.advanced textarea{font:12px/1.6 ui-monospace,monospace;margin:10px 0}.advanced pre{font-size:11px;white-space:pre-wrap;overflow-wrap:anywhere}.advanced details details{margin-top:18px}dialog{color:inherit;border:1px solid #495a70;background:#19222d;border-radius:14px;padding:24px;width:min(520px,calc(100vw - 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