:root{color-scheme:dark;font-family:Inter,ui-sans-serif,system-ui,sans-serif;background:#09090b;color:#f4f4f5}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at top,#18181b,#09090b 58%)}button,input,textarea{font:inherit}.app-shell,.auth-screen,.chat-layout{min-height:100vh}.loading{display:grid;place-items:center}.auth-screen{display:grid;place-items:center;padding:24px}.auth-card{width:min(480px,100%);padding:28px;border:1px solid rgba(255,255,255,.08);background:#18181be6;border-radius:24px;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;color:#a1a1aa}.brand-block h1,.chat-header h1,.sidebar-header h2{margin:8px 0}.brand-block p{color:#a1a1aa;line-height:1.6}.field{display:grid;gap:10px;margin:24px 0}.field span{color:#d4d4d8}.field input,.composer textarea{width:100%;border-radius:16px;border:1px solid rgba(255,255,255,.08);background:#ffffff08;color:#fff;padding:14px 16px;outline:none}.primary-button,.secondary-button,.ghost-button{border:0;border-radius:14px;padding:12px 16px;cursor:pointer}.primary-button{background:linear-gradient(135deg,#7c3aed,#2563eb);color:#fff}.secondary-button{background:#ffffff0f;color:#f4f4f5}.ghost-button{background:transparent;color:#d4d4d8}.error-banner{background:#ef44441f;color:#fca5a5;border:1px solid rgba(239,68,68,.25);padding:12px 14px;border-radius:14px}.chat-layout{display:grid;grid-template-columns:300px 1fr}.sidebar{border-right:1px solid rgba(255,255,255,.08);padding:20px;background:#09090ba6}.sidebar-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.thread-list{display:grid;gap:10px;margin-top:16px}.thread-item{text-align:left;padding:14px;border-radius:16px;border:1px solid rgba(255,255,255,.06);background:#ffffff08;color:#f4f4f5}.thread-item.active{border-color:#60a5fa73}.chat-panel{display:grid;grid-template-rows:auto 1fr auto;min-height:100vh}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px}.status-pill{padding:8px 12px;border-radius:999px;background:#ffffff0f;color:#d4d4d8}.messages{padding:0 24px 20px;overflow:auto;display:grid;gap:14px}.bubble{max-width:min(760px,92%);padding:14px 16px;border-radius:20px;border:1px solid rgba(255,255,255,.08)}.bubble.user{margin-left:auto;background:#3b82f629}.bubble.assistant{background:#ffffff0a}.bubble.image img{max-width:100%;border-radius:14px;display:block}.typing{color:#a1a1aa}.composer{padding:0 24px 24px;display:grid;gap:12px}.composer-actions{display:flex;justify-content:space-between;gap:12px}@media(max-width:900px){.chat-layout{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid rgba(255,255,255,.08)}}