*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,system-ui,-apple-system,sans-serif;min-height:100vh;background:radial-gradient(circle at 10% 10%,#1d4ed8,#0b1220 45%,#070b14);color:#0f172a}.page{min-height:100vh;display:grid;place-items:center;padding:24px}.chat-card{width:100%;max-width:860px;background:#fff;border:1px solid #dbe3ef;border-radius:18px;box-shadow:0 25px 70px #02061759;padding:18px;display:grid;gap:12px}.chat-header h1{font-size:1.5rem;color:#0f172a}.chat-header p{color:#475569;margin-top:2px;font-size:.95rem}.meta{display:flex;align-items:center;gap:8px;color:#334155;font-size:.86rem}code{background:#eff6ff;color:#1d4ed8;border:1px solid #bfdbfe;border-radius:8px;padding:2px 8px}.chat-box{border:1px solid #dbe3ef;background:#f8fbff;border-radius:14px;min-height:420px;max-height:62vh;overflow:auto;padding:10px;display:grid;gap:8px}.msg{display:flex}.msg span{max-width:82%;border-radius:12px;padding:10px 12px;line-height:1.45;white-space:pre-wrap}.msg.user{justify-content:flex-end}.msg.user span{background:#2563eb;color:#fff;border-bottom-right-radius:4px}.msg.bot{justify-content:flex-start}.msg.bot span{background:#e2e8f0;color:#0f172a;border-bottom-left-radius:4px}.composer{display:grid;grid-template-columns:1fr auto;gap:8px}.composer input{border:1px solid #cbd5e1;border-radius:10px;padding:11px 12px;font-size:1rem}.composer input:focus{outline:none;border-color:#3b82f6}.composer button{border:none;background:#2563eb;color:#fff;border-radius:10px;padding:0 18px;font-weight:700;cursor:pointer}.composer button:disabled{opacity:.45;cursor:not-allowed}