:root{--bg:#fafafa;--fg:#1a1a1a;--accent:#4f46e5;--border:#e5e7eb;--radius:8px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--fg);font-family:system-ui,sans-serif;line-height:1.6}header{border-bottom:1px solid var(--border);padding:.75rem 1.5rem}header nav{justify-content:space-between;align-items:center;max-width:900px;margin:0 auto;display:flex}header a{color:var(--fg);text-decoration:none}header button{color:var(--accent);cursor:pointer;background:0 0;border:none;font-size:.9rem}main{max-width:900px;margin:1.5rem auto;padding:0 1.5rem}h1{margin-bottom:1rem}h2{font-size:1.2rem}h3{margin-bottom:.25rem;font-size:1rem}.auth-page{max-width:360px;margin:3rem auto;padding:0 1rem}.auth-page form{flex-direction:column;gap:.5rem;display:flex}label{font-size:.85rem;font-weight:500}input,select{border:1px solid var(--border);border-radius:var(--radius);padding:.5rem;font-size:.95rem}button{background:var(--accent);color:#fff;border-radius:var(--radius);cursor:pointer;border:none;padding:.5rem 1rem;font-size:.9rem}button:hover{opacity:.9}button.danger{background:#dc2626}.error{color:#dc2626;font-size:.85rem}.muted{color:#6b7280;font-size:.85rem}.card{border:1px solid var(--border);border-radius:var(--radius);background:#fff;margin-bottom:1rem;padding:1rem}.baby-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem;margin-bottom:1.5rem;display:grid}.tabs{border-bottom:1px solid var(--border);flex-wrap:wrap;gap:.25rem;margin-bottom:1rem;display:flex}.tabs button{color:var(--fg);background:0 0;border:none;border-bottom:2px solid #0000;padding:.5rem .75rem}.tabs button.active{border-bottom-color:var(--accent);color:var(--accent)}.tab-content{min-height:200px}.summary-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem;display:grid}.summary-grid .card{text-align:center}.summary-grid h3{color:var(--accent);font-size:2rem}.inline-form{flex-wrap:wrap;align-items:end;gap:.5rem;margin-bottom:1rem;display:flex}.inline-form input,.inline-form select{min-width:100px}table{border-collapse:collapse;width:100%;font-size:.9rem}th,td{text-align:left;border-bottom:1px solid var(--border);padding:.5rem}th{text-transform:uppercase;color:#6b7280;font-size:.8rem;font-weight:600}.ai-text{white-space:pre-wrap;margin-top:.75rem;line-height:1.5}.chat-messages{max-height:300px;margin-bottom:.75rem;overflow-y:auto}.chat-msg{border-radius:var(--radius);margin-bottom:.5rem;padding:.5rem}.chat-msg.user{background:#eef2ff}.chat-msg.ai{background:#f0fdf4}.landing{min-height:100vh}.landing-nav{justify-content:space-between;align-items:center;max-width:1100px;margin:0 auto;padding:1rem 2rem;display:flex}.landing-logo{font-size:1.3rem;font-weight:700}.landing-nav-links{align-items:center;gap:1rem;display:flex}.landing-nav-links a{color:var(--fg);text-decoration:none}.btn{background:var(--accent);color:#fff;border-radius:var(--radius);cursor:pointer;border:none;padding:.6rem 1.2rem;font-size:.95rem;font-weight:500;text-decoration:none;display:inline-block}.btn:hover{opacity:.9}.btn-lg{padding:.85rem 2rem;font-size:1.1rem}.hero{text-align:center;max-width:700px;margin:0 auto;padding:5rem 2rem 4rem}.hero h1{letter-spacing:-.02em;margin-bottom:1.2rem;font-size:2.8rem;line-height:1.2}.hero-sub{color:#555;margin-bottom:2rem;font-size:1.15rem;line-height:1.6}.features{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;max-width:1100px;margin:0 auto;padding:2rem 2rem 4rem;display:grid}.feature-card{border:1px solid var(--border);background:#fff;border-radius:12px;padding:1.5rem}.feature-icon{margin-bottom:.5rem;font-size:2rem;display:block}.feature-card h3{margin-bottom:.4rem}.feature-card p{color:#555;font-size:.9rem;line-height:1.5}.cta{text-align:center;background:#f0f0ff;margin-top:2rem;padding:4rem 2rem}.cta h2{margin-bottom:.6rem;font-size:2rem}.cta p{color:#555;margin-bottom:1.5rem;font-size:1.05rem}.landing-footer{text-align:center;color:#888;padding:2rem;font-size:.85rem}.ai-layout{grid-template-columns:200px 1fr;gap:1rem;min-height:400px;display:grid}.thread-list{border-right:1px solid var(--border);flex-direction:column;gap:.5rem;padding-right:1rem;display:flex}.thread-item{border-radius:var(--radius);cursor:pointer;align-items:center;gap:.4rem;padding:.4rem .5rem;font-size:.85rem;display:flex}.thread-item:hover{background:var(--border)}.thread-item.active{background:var(--accent);color:#fff}.thread-title{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.btn-sm{padding:.4rem .6rem;font-size:.8rem}.chat-area{flex-direction:column;display:flex}.chat-area .chat-messages{flex:1;overflow-y:auto}@media (width<=640px){.ai-layout{grid-template-columns:1fr}.thread-list{border-right:none;border-bottom:1px solid var(--border);flex-flow:wrap;padding-bottom:.5rem}}