:root{--ink: #1a1a1a;--muted: #5c5c5c;--line: #e6e6e6;--paper: #ffffff;--wash: #f7f7f5;--accent: #1a1a1a}*{box-sizing:border-box}html,body{margin:0;background:var(--wash);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}a{color:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:220px 1fr}.app-nav{padding:28px 20px;border-right:1px solid var(--line);background:var(--paper)}.app-nav a{display:block;text-decoration:none;padding:8px 0;color:var(--muted)}.app-nav a[aria-current=page],.app-nav a.active{color:var(--ink);font-weight:600}.app-brand{font-size:15px;font-weight:600;margin:0 0 28px}.app-main{padding:36px 40px 80px;max-width:960px}.page-title{font-size:32px;letter-spacing:-.03em;font-weight:560;margin:0 0 8px}.lede{color:var(--muted);font-size:16px;line-height:1.5;max-width:42em;margin:0 0 28px}.card{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:22px 22px 20px;margin:0 0 18px}.card h2,.card h3{margin:0 0 10px;font-size:16px;font-weight:600}.checklist{list-style:none;padding:0;margin:0}.checklist li{display:flex;gap:10px;align-items:flex-start;padding:8px 0;color:var(--ink)}.checklist li span.mark{width:18px;height:18px;border-radius:50%;border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;font-size:11px;flex:none}.checklist li.done span.mark{background:var(--ink);color:#fff;border-color:var(--ink)}.btn{appearance:none;border:1px solid var(--ink);background:var(--ink);color:#fff;border-radius:8px;padding:10px 14px;font:inherit;font-size:14px;cursor:pointer;text-decoration:none;display:inline-block}.btn.secondary{background:#fff;color:var(--ink)}.btn:disabled{opacity:.45;cursor:not-allowed}.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.field{display:flex;flex-direction:column;gap:6px;margin:0 0 14px;font-size:14px}.field input,.field select,.field textarea{font:inherit;padding:9px 10px;border:1px solid var(--line);border-radius:8px;background:#fff}.field label{color:var(--muted)}.banner{border:1px solid var(--line);background:#fff;padding:12px 14px;border-radius:10px;margin:0 0 16px}.banner.ok{border-color:#1a1a1a}.banner.warn{background:#fff8e8}.block-card{border:1px solid var(--line);border-radius:10px;padding:14px;margin:0 0 12px;background:#fff}.block-card header{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}.quiet{color:var(--muted);font-size:14px}.preview-layout{display:grid;grid-template-columns:280px 1fr;gap:28px;align-items:start}.phone-frame{width:280px;height:580px;border:10px solid #111;border-radius:32px;overflow:hidden;background:#fff;box-shadow:0 16px 40px #00000014}.phone-frame iframe,.phone-screen{width:100%;height:100%;border:0}.qr svg{width:180px;height:180px;display:block}@media(max-width:860px){.app-shell{grid-template-columns:1fr}.app-nav{border-right:0;border-bottom:1px solid var(--line);display:flex;gap:14px;flex-wrap:wrap;padding:16px 18px}.app-brand{margin:0 12px 0 0}.app-main{padding:24px 18px 64px}.preview-layout{grid-template-columns:1fr}}s-page,s-section,s-stack,s-box,s-banner,s-empty-state{display:block}s-button{display:inline-flex;align-items:center}s-paragraph,s-heading,s-text{display:block}