:root{font-family:Inter,"Segoe UI",Arial,sans-serif;--navy:#0E172E;--primary:#1F5CEB;--app-bg:#EDF2F7;--surface:#fff;--border:#C9D4E3;--text:#0F1A2E;--muted:#566681;--canvas:#0A1426;--gap:12px;--left:304px;--right:292px}*{box-sizing:border-box}body{margin:0;background:var(--app-bg);color:var(--text)}.app-topbar{height:72px;max-width:1440px;margin:auto;padding:0 16px;display:flex;align-items:center;justify-content:space-between;background:var(--navy);color:#fff}.app-brand,.brand,.topbar-actions{display:flex;align-items:center;gap:12px}.cl-mark{display:grid;place-items:center;width:34px;height:34px;border:1px solid #7794cc;border-radius:8px;font-size:12px;font-weight:800}.app-topbar h1{font-size:21.25px;margin:0}.app-topbar p{font-size:12px;color:#b9c8e2;margin:3px 0}.topbar-actions{gap:8px}.topbar-actions span{font-size:12px;color:#b9c8e2}.topbar-actions button{min-height:34px;padding:6px 11px;border:1px solid #4e648f;border-radius:6px;background:#182542;color:#fff}.topbar-actions #openDxf{background:var(--primary);border-color:var(--primary)}.desktop-shell{max-width:1440px;height:calc(100vh - 72px);min-height:640px;margin:auto;padding:16px;display:grid;grid-template-columns:minmax(250px,var(--left)) minmax(420px,1fr) minmax(230px,var(--right));gap:var(--gap);background:var(--app-bg)}.workflow,.inspector-panel{overflow:auto;padding:12px;background:var(--surface);border:1px solid var(--border);border-radius:8px}.workflow fieldset{margin:0 0 12px;padding:12px;border:1px solid var(--border);border-radius:7px}.workflow legend{font-size:12px;color:var(--muted);text-transform:uppercase}.workflow button,.workflow .file-button{min-height:36px;font-size:13px;border-radius:6px}.button-grid{gap:8px}.workspace{min-width:0;overflow:hidden;background:transparent}.workflow-tabs{height:44px;display:flex;align-items:flex-end;gap:2px;padding:0 4px;background:transparent}.workflow-tabs button{height:44px;padding:0 10px;border:0;border-bottom:3px solid transparent;background:transparent;color:var(--muted);font-size:12px}.workflow-tabs button.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:700}.compact-toolbar{min-height:48px;padding:6px 10px;background:var(--surface);border:1px solid var(--border);border-radius:8px 8px 0 0}.workspace-panel{padding:12px;background:var(--surface);border:1px solid var(--border);border-top:0}.canvas-viewport{background:var(--canvas);border:1px solid #243858;border-radius:6px}.drawing{background:var(--canvas)}.status-bar{min-height:34px;padding:8px 12px;background:#e7eef8;border:1px solid var(--border);border-top:0;border-radius:0 0 8px 8px;font-size:12px}.right-inspector h2{font-size:13px;margin:0 0 12px}.right-inspector p{font-size:12px;line-height:1.5}.empty-state{min-height:360px;border:1px dashed #8296b7;border-radius:8px;background:var(--surface);color:var(--muted);text-align:center}.desktop-shell[hidden]{display:none}@media(max-width:1100px){.desktop-shell{grid-template-columns:minmax(220px,280px) minmax(390px,1fr);padding:12px}.right-inspector{display:none}.app-topbar p{display:none}}@media(max-width:760px){.desktop-shell{grid-template-columns:1fr;height:auto}.workflow{max-height:none}.workspace{min-height:620px}.workflow-tabs{overflow-x:auto}.app-topbar h1{font-size:14px}.topbar-actions #saveLayout{display:none}}