.site-wrapper{display:flex;flex-direction:column;height:100vh;overflow:hidden}.site-main{flex:1;overflow-y:auto;overflow-x:hidden}.site-nav{background:#fff;border-bottom:1px solid #e4e7eb;flex-shrink:0;position:sticky;top:0;z-index:100}.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:56px;display:flex;align-items:center;gap:40px}.nav-logo{display:flex;align-items:center;gap:8px;text-decoration:none;color:#1e293b;font-weight:700;font-size:16px;flex-shrink:0}.nav-logo svg{color:#2563eb}.nav-links{display:flex;align-items:center;gap:4px;flex:1}.nav-link{padding:6px 12px;border-radius:6px;text-decoration:none;color:#64748b;font-size:14px;font-weight:500;transition:all .15s}.nav-link:hover{color:#1e293b;background:#f1f5f9}.nav-link.router-link-active{color:#2563eb;background:#eff6ff}.fade-enter-active,.fade-leave-active{transition:opacity .18s ease}.fade-enter-from,.fade-leave-to{opacity:0}:root{--bg: #f8fafc;--panel: #ffffff;--border: #e4e7eb;--border-strong: 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10px;font-size:12px;border-radius:var(--radius-sm);gap:4px}.btn-icon{padding:6px 8px;border-radius:var(--radius-sm);width:30px;height:30px}.toolbar{padding:10px 14px;border-bottom:1px solid var(--border);display:flex;flex-wrap:wrap;gap:8px;align-items:center;flex-shrink:0}.toolbar.end{justify-content:flex-end}.toolbar-footer{padding:10px 14px;border-top:1px solid var(--border);border-bottom:none;flex-shrink:0}.input,.textarea{width:100%;padding:8px 10px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:#fff;font-family:inherit;font-size:13px;color:var(--text);outline:none;transition:border-color .15s,box-shadow .15s}.input:focus,.textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px #2563eb1f}.textarea{resize:none;font-family:ui-monospace,Cascadia Code,Consolas,monospace;font-size:12.5px;line-height:1.45}.label{font-size:12px;color:var(--muted);margin-bottom:4px;display:block}.form-row{margin-bottom:12px}.diagram-wrap{flex:1;position:relative;min-height:240px;background:var(--canvas);overflow:hidden;cursor:grab}.diagram-wrap.panning{cursor:grabbing}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 20px;color:var(--muted);text-align:center;gap:12px;flex:1}.empty-state svg{width:56px;height:56px;opacity:.35}.empty-state p{font-size:13px;line-height:1.7;max-width:320px;margin:0}.add-root-btn{display:flex;align-items:center;justify-content:center;gap:6px;padding:12px;margin-top:8px;border:2px dashed var(--border);border-radius:var(--radius-md);background:transparent;cursor:pointer;color:var(--muted);font-size:13px;font-family:inherit;transition:all 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