:root{--gb-nav-height:60px;--gb-color-bg:#f8fafc;--gb-color-gutter:#e2e8f0;--gb-color-surface:#fff;--gb-color-text:#0f172a;--gb-color-text-body:#334155;--gb-color-text-muted:#64748b;--gb-color-primary:#2563eb;--gb-color-primary-hover:#1d4ed8;--gb-color-border:#e2e8f0;--gb-radius-sm:8px;--gb-radius-md:12px;--gb-radius-lg:16px;--gb-shadow-card:0 1px 2px #0f172a0f, 0 4px 12px #0f172a0a;--gb-content-width:85%;--gb-content-min:960px}*,:before,:after{box-sizing:border-box}html,body,#app{width:100%;min-height:100%;color:var(--gb-color-text);background:var(--gb-color-bg);margin:0;padding:0;font-family:Segoe UI,system-ui,-apple-system,sans-serif;overflow:hidden auto}.gb-page-shell,.gb-container,.app-nav-inner,.tool-workspace,.site-footer-inner,.tool-docs-inner{width:var(--gb-content-width);min-width:var(--gb-content-min);box-sizing:border-box;max-width:100%;margin-inline:auto}@media (width<=960px){.gb-page-shell,.gb-container,.app-nav-inner,.tool-workspace,.site-footer-inner,.tool-docs-inner{width:100%;min-width:0;padding-inline:16px}}.gb-badge{color:var(--gb-color-primary);background:#eff6ff;border:1px solid #dbeafe;border-radius:999px;align-items:center;padding:4px 12px;font-size:12px;font-weight:600;display:inline-flex}.gb-btn{border-radius:var(--gb-radius-sm);cursor:pointer;border:1px solid #0000;justify-content:center;align-items:center;gap:6px;padding:10px 18px;font-size:14px;font-weight:600;text-decoration:none;display:inline-flex}.gb-btn-primary{color:#fff;background:var(--gb-color-primary);border-color:var(--gb-color-primary)}.gb-btn-primary:hover{background:var(--gb-color-primary-hover);border-color:var(--gb-color-primary-hover);color:#fff}.gb-btn-secondary{color:var(--gb-color-text);background:var(--gb-color-surface);border-color:var(--gb-color-border)}.gb-btn-secondary:hover{color:var(--gb-color-text);background:#f8fafc;border-color:#cbd5e1}button,input,select{font:inherit}.app-layout{flex-direction:column;min-height:100vh;display:flex}.app-main{background:var(--gb-color-gutter);flex:none;overflow:visible}.app-nav{z-index:20;height:var(--gb-nav-height);background:var(--gb-color-surface);color:var(--gb-color-text);border-bottom:1px solid var(--gb-color-border);flex-shrink:0;position:sticky;top:0}.app-nav-inner{align-items:center;gap:16px;height:100%;display:flex}.app-nav-left{flex:none}.app-title{color:var(--gb-color-text);font-size:16px;font-weight:700;text-decoration:none}.app-title:hover{color:var(--gb-color-primary)}.app-nav-links{align-items:center;gap:4px;display:flex}.nav-link{color:var(--gb-color-text-muted);border-radius:var(--gb-radius-sm);padding:6px 12px;font-size:14px;text-decoration:none;transition:background .15s,color .15s}.nav-link:hover{color:var(--gb-color-text);background:#f1f5f9}.nav-link.active{color:var(--gb-color-primary);background:#eff6ff}.tool-workspace{height:calc(100vh - 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