:root{--nova-blue:#00b4ff;--nova-violet:#8a2be2;--nova-red:#ff3b3b;--nova-cyan:#00d4ff;--bg-1:#0a0a12;--bg-2:#0f0f1d;--bg-3:#16131f;--panel:rgba(15,15,25,.7);--glass:hsla(0,0%,100%,.05);--accent:rgba(138,43,226,.15)}@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap");*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,Arial;background:radial-gradient(1400px 800px at 15% 20%,rgba(10,80,200,.08),transparent),radial-gradient(900px 600px at 85% 85%,rgba(138,43,226,.06),transparent),linear-gradient(135deg,var(--bg-1),var(--bg-2) 50%,var(--bg-3));color:#e8e8f0;min-height:100vh;overflow:hidden}.app-root{display:flex;height:100vh;gap:18px;padding:10px 6px 10px 18px;background:inherit}.sidebar{width:220px;min-width:200px;background:linear-gradient(180deg,rgba(20,15,35,.6),rgba(12,10,22,.5));padding:12px;border-radius:16px;border:1px solid rgba(138,43,226,.15);box-shadow:0 10px 40px rgba(0,0,0,.35),inset 0 1px 0 hsla(0,0%,100%,.04);display:flex;flex-direction:column}.sidebar-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:8px}.brand{display:flex;flex-direction:column;gap:2px}.logo{font-weight:800;color:var(--nova-blue);font-size:22px;letter-spacing:2px;text-shadow:0 0 20px rgba(0,180,255,.3)}.subtitle{font-size:11px;color:rgba(230,230,238,.5);text-transform:uppercase;letter-spacing:.5px}.btn-new{background:linear-gradient(135deg,var(--nova-violet),var(--nova-blue));color:#fff;padding:10px 14px;border-radius:10px;border:1px solid hsla(0,0%,100%,.1);cursor:pointer;font-weight:600;font-size:13px;transition:all .2s ease;box-shadow:0 4px 15px rgba(138,43,226,.2)}.btn-new:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(138,43,226,.3)}.btn-new:active{transform:translateY(0)}.search-wrap{margin:14px 0}.search{width:100%;padding:10px 14px;border-radius:10px;border:1px solid var(--glass);background:hsla(0,0%,100%,.02);color:inherit;font-size:13px;transition:all .2s ease}.search:focus{outline:none;background:hsla(0,0%,100%,.04);border-color:rgba(0,180,255,.3);box-shadow:0 0 15px rgba(0,180,255,.1)}.search::placeholder{color:rgba(230,230,238,.4)}.conversations{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:6px;flex:1 1;overflow-y:auto}.conversations::-webkit-scrollbar{width:6px}.conversations::-webkit-scrollbar-track{background:transparent}.conversations::-webkit-scrollbar-thumb{background:rgba(138,43,226,.3);border-radius:3px}.conversations::-webkit-scrollbar-thumb:hover{background:rgba(138,43,226,.5)}.empty{color:rgba(230,230,238,.4);padding:20px 12px;text-align:center;font-size:13px}.conversation-item{display:flex;gap:10px;align-items:center;padding:10px 12px;border-radius:10px;cursor:pointer;transition:all .15s ease;border:1px solid transparent}.conversation-item:hover{transform:translateX(4px);background:rgba(0,180,255,.05);border-color:rgba(0,180,255,.2)}.conversation-item:active{background:rgba(0,180,255,.1)}.conv-thumb{width:40px;height:40px;border-radius:8px;background:linear-gradient(135deg,var(--nova-blue),var(--nova-violet));display:flex;align-items:center;justify-content:center;font-weight:700;color:#04111a;font-size:14px;box-shadow:0 4px 12px rgba(0,180,255,.2);flex-shrink:0}.conv-title{font-weight:600;font-size:13px;color:#e8e8f0}.conv-sub{font-size:12px;color:rgba(230,230,238,.5)}.sidebar-footer{margin-top:auto;padding-top:14px;border-top:1px solid hsla(0,0%,100%,.03);color:rgba(230,230,238,.4);font-size:11px;text-align:center}.chat-area{flex:1 1;display:flex;flex-direction:column;gap:16px}.topbar{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;border-radius:14px;background:linear-gradient(135deg,hsla(0,0%,100%,.03),hsla(0,0%,100%,.02));border:1px solid rgba(138,43,226,.08);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:0 6px 28px rgba(0,0,0,.25)}.brand-small{font-weight:800;color:var(--nova-blue);font-size:20px;letter-spacing:1px;text-shadow:0 0 15px rgba(0,180,255,.25)}.brand-small .dot{color:var(--nova-red)}.tagline{font-size:12px;color:rgba(230,230,238,.6);margin-left:10px}.top-right .actions{display:flex;align-items:center;gap:10px}.btn-pro{background:linear-gradient(90deg,var(--nova-violet),var(--nova-blue));color:#fff;padding:8px 10px;border-radius:10px;border:none;cursor:pointer;font-weight:700;box-shadow:0 6px 18px rgba(138,43,226,.18)}.btn-outline{background:transparent;border:1px solid hsla(0,0%,100%,.06);padding:6px 8px;border-radius:8px;color:inherit}.auth-google{background:linear-gradient(90deg,#4285f4,#2b6df6);border:none;color:#fff;padding:8px 12px;border-radius:10px;display:flex;align-items:center;gap:8px}.auth-google:before{content:"G";font-weight:700;background:#fff;color:#4285f4;border-radius:4px;padding:2px 4px;font-size:12px}.user-avatar{width:34px;height:34px;border-radius:8px;margin-right:8px}.user-info{display:flex;align-items:center;gap:8px;padding-right:6px}.user-email{font-size:13px;color:rgba(230,230,238,.85)}.auth-row{display:flex;gap:10px;align-items:center;padding:6px 18px}.auth-btn{background:hsla(0,0%,100%,.08);border:1px solid hsla(0,0%,100%,.1);color:inherit;padding:8px 14px;border-radius:8px;cursor:pointer;font-size:13px;font-weight:500;transition:all .2s ease}.auth-btn:hover{background:rgba(0,180,255,.15);border-color:rgba(0,180,255,.3);box-shadow:0 0 12px rgba(0,180,255,.15)}.signed{color:rgba(230,230,238,.8)}.chat-window{display:flex;flex-direction:column;flex:1 1;padding:18px;border-radius:18px;background:linear-gradient(135deg,rgba(22,16,38,.35),rgba(12,8,22,.18));border:1px solid rgba(138,43,226,.08);box-shadow:0 10px 40px rgba(0,0,0,.28),inset 0 1px 0 hsla(0,0%,100%,.03);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);min-height:0;overflow:hidden;min-height:calc(100vh - 140px)}.chat-topbar{display:flex;justify-content:space-between;align-items:center;padding-bottom:14px;border-bottom:1px solid rgba(138,43,226,.1);margin-bottom:16px;flex-shrink:0}.conv-info h2{margin:0;font-size:18px;font-weight:600;color:#e8e8f0}.conv-meta-small{font-size:12px;color:rgba(230,230,238,.5);margin-top:4px}.model-select{display:flex;gap:10px;align-items:center}.model-select select{padding:8px 12px;border-radius:8px;border:1px solid var(--glass);background:hsla(0,0%,100%,.04);color:inherit;cursor:pointer;font-size:13px;font-weight:500;transition:all .2s ease}.model-select select:focus{outline:none;background:rgba(0,180,255,.08);border-color:rgba(0,180,255,.3);box-shadow:0 0 12px rgba(0,180,255,.15)}.model-select select option{background:#0a0a12;color:#e8e8f0}.custom-model{padding:8px 12px;border-radius:8px;border:1px solid var(--glass);background:hsla(0,0%,100%,.04);color:inherit;font-size:13px;transition:all .2s ease;width:140px}.custom-model:focus{outline:none;background:rgba(0,180,255,.08);border-color:rgba(0,180,255,.3)}.messages{flex:1 1;overflow-y:auto;overflow-x:hidden;padding:12px;display:flex;flex-direction:column;gap:16px;min-height:0}.messages::-webkit-scrollbar{width:8px}.messages::-webkit-scrollbar-track{background:transparent}.messages::-webkit-scrollbar-thumb{background:rgba(138,43,226,.3);border-radius:4px}.messages::-webkit-scrollbar-thumb:hover{background:rgba(138,43,226,.5)}.message{display:flex;align-items:flex-end;gap:12px;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.avatar{width:40px;height:40px;border-radius:10px;box-shadow:0 4px 12px rgba(0,180,255,.2)}.bubble{padding:14px 18px;border-radius:18px;max-width:88%;line-height:1.6;word-wrap:break-word}.user-bubble{margin-left:auto;background:linear-gradient(135deg,var(--nova-blue),var(--nova-violet));color:#fff;box-shadow:0 6px 20px rgba(0,180,255,.2);white-space:pre-wrap;font-weight:500}.assistant-bubble{background:linear-gradient(135deg,hsla(0,0%,100%,.06),hsla(0,0%,100%,.03));color:inherit;border:1px solid rgba(138,43,226,.15)}.message-content{display:flex;flex-direction:column;gap:8px;word-wrap:break-word}.message-content p{margin:0;line-height:1.7;color:inherit}.message-content h1{margin:12px 0 6px;font-size:20px;color:var(--nova-blue);font-weight:700}.message-content h2{margin:10px 0 6px;font-size:17px;color:var(--nova-violet);font-weight:700}.message-content h3{margin:8px 0 4px;font-size:15px;color:var(--nova-cyan);font-weight:600}.message-content ul{margin:8px 0;padding-left:24px;list-style:none}.message-content li{margin:4px 0;color:inherit;position:relative}.message-content li:before{content:"▸";position:absolute;left:-16px;color:var(--nova-blue)}.attachments-preview{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}.attachment-img{max-width:280px;max-height:280px;border-radius:12px;border:1px solid rgba(138,43,226,.2);cursor:pointer;transition:all .2s ease;box-shadow:0 4px 15px rgba(0,0,0,.2)}.attachment-img:hover{transform:scale(1.02);box-shadow:0 6px 20px rgba(0,180,255,.2)}.attachments{display:flex;gap:8px;flex-wrap:wrap;padding:10px;background:rgba(138,43,226,.08);border-radius:10px;margin-bottom:10px;border:1px solid rgba(138,43,226,.15)}.attachment-item{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;background:rgba(0,180,255,.12);border-radius:8px;font-size:12px;gap:8px;border:1px solid rgba(0,180,255,.2)}.btn-remove{background:none;border:none;color:rgba(230,230,238,.8);cursor:pointer;padding:0 4px;font-size:18px;font-weight:700;transition:color .2s ease}.btn-remove:hover{color:var(--nova-red)}.typing{font-style:italic;color:rgba(230,230,238,.6)}.typing:after{content:"";animation:blink 1.4s infinite}@keyframes blink{0%,49%{opacity:1}50%,to{opacity:0}}.composer{display:flex;gap:12px;padding:12px;border-top:1px solid rgba(138,43,226,.08);align-items:flex-end;flex-wrap:wrap;background:linear-gradient(90deg,hsla(0,0%,100%,.02),hsla(0,0%,100%,.01));flex-shrink:0;overflow:hidden}.composer textarea{flex:1 1;min-width:200px;padding:12px 14px;border-radius:12px;border:1px solid var(--glass);background:hsla(0,0%,100%,.04);color:inherit;font-family:inherit;font-size:14px;resize:vertical;max-height:150px;line-height:1.5;transition:all .2s ease}.composer textarea:focus{outline:none;background:rgba(0,180,255,.08);border-color:rgba(0,180,255,.3);box-shadow:0 0 15px rgba(0,180,255,.1)}.composer textarea::placeholder{color:rgba(230,230,238,.4)}.composer input{flex:1 1;border-radius:12px;border:1px solid var(--glass);background:hsla(0,0%,100%,.04);color:inherit}.btn-attach,.composer input{padding:12px 14px;transition:all .2s ease}.btn-attach{background:linear-gradient(135deg,var(--nova-violet),var(--nova-blue));color:#fff;border-radius:12px;border:1px solid hsla(0,0%,100%,.1);cursor:pointer;font-size:16px;font-weight:600;height:-moz-fit-content;height:fit-content;box-shadow:0 4px 15px rgba(138,43,226,.2)}.btn-attach:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(138,43,226,.3)}.btn-attach:active{transform:translateY(0)}.btn-attach:disabled{opacity:.5;cursor:not-allowed}.btn-send{background:linear-gradient(135deg,var(--nova-red),#ff6b6b);color:#fff;padding:12px 18px;border-radius:12px;border:1px solid hsla(0,0%,100%,.1);cursor:pointer;font-weight:600;font-size:14px;transition:all .2s ease;box-shadow:0 4px 15px rgba(255,59,59,.2)}.btn-send:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(255,59,59,.3)}.btn-send:active{transform:translateY(0)}.btn-send:disabled{opacity:.5;cursor:not-allowed}@media (max-width:900px){.app-root{flex-direction:column;padding:16px}.sidebar{max-height:120px}.chat-area,.sidebar{width:100%}.conversations{flex-direction:row;overflow-x:auto}}@media (max-width:600px){.app-root{padding:12px}.bubble{max-width:90%}.sidebar{padding:14px}.logo{font-size:18px}}