:root{--primary:#2563eb;--primary-hover:#1d4ed8;--background:#f1f5f9;--surface:#fff;--text:#0f172a;--text-muted:#64748b;--border:#e2e8f0;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--font-family:"Inter", system-ui, -apple-system, sans-serif;--radius:8px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f}body{font-family:var(--font-family);background-color:var(--background);color:var(--text);-webkit-font-smoothing:antialiased;margin:0;line-height:1.5}h1,h2,h3,h4{color:var(--text);margin:0;font-weight:600}.layout{flex-direction:column;max-width:1200px;min-height:100vh;margin:0 auto;padding:0 20px;display:flex}.header{justify-content:space-between;align-items:center;margin-bottom:24px;padding:24px 0;display:flex}.nav{gap:24px;display:flex}.nav-link{color:var(--text-muted);padding-bottom:4px;font-weight:500;text-decoration:none;transition:color .2s}.nav-link:hover{color:var(--text)}.nav-link.active{color:var(--primary);border-bottom:2px solid var(--primary)}.main-content{flex:1}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-sm);border:1px solid var(--border);margin-bottom:24px;padding:24px}.help-icon{background:var(--border);width:16px;height:16px;color:var(--text-muted);cursor:help;border-radius:50%;justify-content:center;align-items:center;margin-left:6px;font-size:11px;font-weight:700;display:inline-flex}.tooltip-container{display:inline-block;position:relative}.tooltip-content{visibility:hidden;background-color:var(--text);color:#fff;text-align:center;z-index:1000;opacity:0;pointer-events:none;border-radius:6px;width:max-content;max-width:250px;padding:6px 12px;font-size:12px;transition:opacity .2s;position:absolute;bottom:125%;left:50%;transform:translate(-50%)}.tooltip-container:hover .tooltip-content{visibility:visible;opacity:1}