:root{--nt-bg:#0e1626;--nt-surface:#16223b;--nt-surface-2:#1f2f4d;--nt-border:#2a3d63;--nt-text:#eaf0fb;--nt-text-dim:#9fb0cd;--nt-accent:#2f9be0;--nt-accent-deep:#1d7ec0;--nt-user:#234a73;--nt-danger:#ff6b6b;--nt-danger-bg:#3a1f24;--nt-warn-bg:#2a2410;--nt-warn-text:#e8cf7a}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--nt-bg);color:var(--nt-text);-webkit-font-smoothing:antialiased;overscroll-behavior-y:contain;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.nt-center{justify-content:center;align-items:center;min-height:100%;padding:24px;display:flex}.nt-spinner{border:3px solid var(--nt-border);border-top-color:var(--nt-accent);border-radius:50%;width:36px;height:36px;animation:.8s linear infinite nt-spin}@keyframes nt-spin{to{transform:rotate(360deg)}}.nt-login{flex-direction:column;gap:10px;width:100%;max-width:380px;display:flex}.nt-brand{text-align:center;margin-bottom:12px}.nt-logo{font-size:40px}.nt-brand h1{letter-spacing:-.02em;margin:4px 0 2px;font-size:26px}.nt-brand p{color:var(--nt-text-dim);margin:0;font-size:13px}.nt-label{color:var(--nt-text-dim);margin-top:6px;font-size:13px}.nt-input{background:var(--nt-surface);width:100%;color:var(--nt-text);border:1px solid var(--nt-border);border-radius:12px;outline:none;padding:14px;font-size:16px}.nt-input:focus{border-color:var(--nt-accent)}.nt-fineprint{text-align:center;color:var(--nt-text-dim);margin:10px 0 0;font-size:12px}.nt-btn{appearance:none;cursor:pointer;color:#fff;border:none;border-radius:12px;min-height:50px;padding:14px;font-size:16px;font-weight:600}.nt-btn-primary{background:var(--nt-accent);margin-top:6px}.nt-btn-primary:disabled{background:var(--nt-border);cursor:not-allowed}.nt-app{flex-direction:column;max-width:720px;height:100%;margin:0 auto;display:flex}.nt-header{padding:12px 16px;padding-top:max(12px, env(safe-area-inset-top));background:var(--nt-surface);border-bottom:1px solid var(--nt-border);flex-shrink:0;justify-content:space-between;align-items:center;display:flex}.nt-header-title{align-items:center;gap:6px;font-size:17px;font-weight:700;display:flex}.nt-logo-sm{font-size:18px}.nt-signout{border:1px solid var(--nt-border);color:var(--nt-text-dim);cursor:pointer;background:0 0;border-radius:8px;padding:7px 12px;font-size:13px}.nt-banner{background:var(--nt-warn-bg);color:var(--nt-warn-text);text-align:center;border-bottom:1px solid var(--nt-border);flex-shrink:0;padding:8px 16px;font-size:12.5px}.nt-thread{-webkit-overflow-scrolling:touch;flex-direction:column;flex:1;gap:12px;padding:16px;display:flex;overflow-y:auto}.nt-empty{text-align:center;margin:auto 0}.nt-empty-hi{color:var(--nt-text-dim);margin-bottom:16px;font-size:15px}.nt-chips{flex-direction:column;gap:10px;display:flex}.nt-chip{background:var(--nt-surface);color:var(--nt-text);border:1px solid var(--nt-border);text-align:left;cursor:pointer;border-radius:12px;padding:14px 16px;font-size:15px}.nt-chip:active{background:var(--nt-surface-2)}.nt-row{display:flex}.nt-row-user{justify-content:flex-end}.nt-row-bot{justify-content:flex-start}.nt-bubble{white-space:pre-wrap;word-break:break-word;border-radius:16px;max-width:85%;padding:12px 14px;font-size:15.5px;line-height:1.5}.nt-bubble-user{background:var(--nt-user);border-bottom-right-radius:5px}.nt-bubble-bot{background:var(--nt-surface);border:1px solid var(--nt-border);border-bottom-left-radius:5px}.nt-typing{align-items:center;gap:5px;display:inline-flex}.nt-typing span{background:var(--nt-text-dim);border-radius:50%;width:7px;height:7px;animation:1.2s infinite nt-bounce}.nt-typing span:nth-child(2){animation-delay:.15s}.nt-typing span:nth-child(3){animation-delay:.3s}@keyframes nt-bounce{0%,60%,to{opacity:.3}30%{opacity:1}}.nt-error{color:var(--nt-danger);font-size:13.5px}.nt-error-bar{background:var(--nt-danger-bg);text-align:center;flex-shrink:0;padding:10px 16px}.nt-input-bar{padding:10px 12px;padding-bottom:max(10px, env(safe-area-inset-bottom));background:var(--nt-surface);border-top:1px solid var(--nt-border);flex-shrink:0;align-items:flex-end;gap:8px;display:flex}.nt-textarea{resize:none;background:var(--nt-bg);min-height:48px;max-height:140px;color:var(--nt-text);border:1px solid var(--nt-border);border-radius:14px;outline:none;flex:1;padding:13px 14px;font-family:inherit;font-size:16px;line-height:1.4}.nt-textarea:focus{border-color:var(--nt-accent)}.nt-send{background:var(--nt-accent);color:#fff;cursor:pointer;border:none;border-radius:50%;flex-shrink:0;width:48px;height:48px;font-size:22px}.nt-send:disabled{background:var(--nt-border);cursor:not-allowed}