:root{--accent:#4f7cff;--accent-dark:#2f4cd8;--bg:#fff;--page-bg:#f4f6fb;--canvas-bg:#eef1f7;--node-fill:#fff;--text:#1c1c1e;--muted:#6b7280;--good:#34c759;--bad:#ff3b30;font-family:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{background:var(--page-bg);color:var(--text);margin:0}#root{min-height:100vh}.app-shell{flex-direction:column;min-height:100vh;display:flex}.navbar{z-index:40;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffffd9;border-bottom:1px solid #0000000f;position:sticky;top:0}.navbar-inner{align-items:center;gap:32px;max-width:1180px;margin:0 auto;padding:14px 32px;display:flex}.navbar-brand{cursor:pointer;color:var(--text);background:0 0;border:none;padding:0;font-size:18px;font-weight:800}.navbar-links{gap:4px;display:flex}.navbar-links button{color:var(--text);cursor:pointer;background:0 0;border:none;border-radius:8px;padding:8px 14px;font-size:14px;font-weight:600}.navbar-links button:hover{color:var(--accent);background:#4f7cff1a}.footer{background:#fff;border-top:1px solid #0000000f;margin-top:auto}.footer-inner{max-width:1180px;color:var(--muted);flex-wrap:wrap;justify-content:space-between;gap:8px;margin:0 auto;padding:18px 32px;font-size:13px;display:flex}.app-main{flex:1;width:100%;max-width:900px;margin:0 auto;padding:40px 24px 64px}.page{flex-direction:column;gap:20px;display:flex}.page h1{margin:0 0 2px;font-size:30px}.muted{color:var(--muted)}.home-hero{text-align:center;padding:20px 0 12px}.home-hero h1{margin-bottom:10px;font-size:38px}.tagline{color:var(--muted);max-width:560px;margin:0 auto;font-size:17px}.mode-cards{grid-template-columns:repeat(2,1fr);gap:20px;margin-top:20px;display:grid}.mode-card{text-align:left;cursor:pointer;color:inherit;background:#fff;border:none;border-radius:18px;padding:28px 24px;text-decoration:none;transition:transform .15s,box-shadow .15s;display:block;box-shadow:0 1px 3px #0000000f}.mode-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px #0000001a}.mode-card h3{margin:0 0 8px;font-size:20px}.mode-card p{color:var(--muted);margin:0;font-size:14px;line-height:1.5}.mode-card-cta{color:var(--accent);margin-top:12px;font-size:14px;font-weight:700;display:inline-block}@media (width<=700px){.mode-cards{grid-template-columns:1fr}}.companion-card{background:linear-gradient(135deg,#4f7cff14,#4f7cff05);border:1px solid #4f7cff2e;margin-top:4px}.companion-card:hover{box-shadow:0 8px 20px #4f7cff1f}.card{background:#fff;border-radius:16px;flex-direction:column;gap:10px;padding:20px;display:flex;box-shadow:0 1px 3px #0000000f}.eyebrow{color:var(--muted);letter-spacing:.5px;margin:0;font-size:12px;font-weight:700}.mode-toggle{background:#eceef2;border-radius:10px;gap:2px;width:fit-content;padding:3px;display:flex}.mode-toggle button{cursor:pointer;color:var(--text);background:0 0;border:none;border-radius:8px;padding:9px 18px;font-size:14px;font-weight:600}.mode-toggle button.active{background:#fff;box-shadow:0 1px 3px #00000026}.field-label{color:var(--muted);font-size:13px;font-weight:700}.text-input{border:1px solid #e2e5ec;border-radius:10px;outline:none;flex:1;padding:10px 14px;font-family:ui-monospace,monospace;font-size:14px}.text-input:focus{border-color:var(--accent)}.test-row{align-items:center;gap:8px;display:flex}.example-row{flex-wrap:wrap;gap:8px;display:flex}.error-text{color:var(--bad);margin:0;font-size:13px}.syntax-help{color:var(--muted);flex-wrap:wrap;gap:6px 16px;font-size:12px;display:flex}.syntax-help code{color:var(--text);background:#f2f4f8;border-radius:6px;margin-right:4px;padding:2px 6px;font-weight:700}.primary-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:10px 20px;font-size:14px;font-weight:700}.primary-btn:hover{background:var(--accent-dark)}.primary-btn:disabled{opacity:.4;cursor:default}.pill{color:var(--accent);cursor:pointer;background:#4f7cff1f;border:none;border-radius:999px;padding:8px 14px;font-size:13px;font-weight:700}.pill:hover{background:#4f7cff38}.pill:disabled{opacity:.4;cursor:default}.pill.active{background:var(--accent);color:#fff}.canvas-editor{flex-direction:column;gap:10px;display:flex}.mode-picker{background:#eceef2;border-radius:10px;gap:2px;padding:3px;display:flex}.mode-picker button{cursor:pointer;color:var(--text);background:0 0;border:none;border-radius:8px;flex:1;padding:9px 6px;font-size:13px;font-weight:600}.mode-picker button.active{background:#fff;box-shadow:0 1px 3px #00000026}.canvas-frame{aspect-ratio:1200/700;border-radius:18px;width:100%;position:relative;overflow:hidden;box-shadow:0 1px 3px #00000014}.canvas-svg{touch-action:none;cursor:crosshair;width:100%;height:100%;display:block}.canvas-controls{flex-direction:column;gap:6px;display:flex;position:absolute;bottom:14px;right:14px}.canvas-controls button{cursor:pointer;width:38px;height:38px;color:var(--text);background:#fffffff2;border:none;border-radius:10px;justify-content:center;align-items:center;font-size:18px;font-weight:700;display:flex;box-shadow:0 1px 4px #0003}.hint{color:var(--muted);margin:0;font-size:13px}.picker-overlay{z-index:50;background:#00000059;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.picker-card{background:#fff;border-radius:20px;flex-direction:column;gap:8px;width:100%;max-width:380px;padding:24px;display:flex}.picker-title{text-align:center;margin:0 0 8px;font-weight:700}.picker-card button{cursor:pointer;background:#f2f4f8;border:none;border-radius:10px;padding:12px;font-size:15px;font-weight:600}.picker-card button.cancel{color:var(--bad);background:0 0}.picker-card button.remove{color:var(--bad);background:#ff3b301a}.viewer{flex-direction:column;gap:16px;display:flex}.viewer-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;display:flex}.viewer-header h3{margin:0;font-size:16px}.viewer-controls{gap:8px;display:flex}.step-explainer p,.step-desc{margin:0;line-height:1.6}.step-explainer code{background:#f2f4f8;border-radius:6px;padding:2px 6px;font-size:13px}.step-list{flex-direction:column;gap:6px;margin:8px 0 0;padding-left:20px;display:flex}.step-list li{line-height:1.6}.tag-new{color:var(--good);font-size:12px;font-weight:700}.tag-existing{color:var(--muted);font-size:12px;font-weight:600}.legend-table{border-collapse:collapse;width:100%}.legend-table th{text-align:left;color:var(--muted);border-bottom:1px solid #eee;padding:6px 8px;font-size:12px}.legend-table td{border-bottom:1px solid #f2f4f8;padding:8px;font-size:14px}.legend-table code{background:#f2f4f8;border-radius:6px;padding:2px 6px;font-size:13px}.companion-link{color:inherit;text-decoration:underline}.companion-link:hover{opacity:.8}