:root{color-scheme:light;--bg:#f8f9fc;--surface:#fff;--surface2:#f2f4f9;--text:#202532;--muted:#747c8c;--line:#e8ebf2;--accent:#3d5afe;--accent-soft:#edf0ff;--shadow:0 16px 60px #212a4c14}
@media(prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#151821;--surface:#1e222e;--surface2:#292e3b;--text:#f0f2f9;--muted:#a6aec0;--line:#353b49;--accent:#8093ff;--accent-soft:#2d3556;--shadow:0 16px 60px #0005}}
*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:Pretendard,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg)}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}button:focus-visible,input:focus-visible,textarea:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}[hidden]{display:none!important}.app{display:flex;height:100dvh;min-height:0}.sidebar{width:268px;flex:0 0 268px;background:var(--surface);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;padding:26px 15px 18px}.brand{display:flex;align-items:center;gap:10px;padding:0 12px 28px;font-size:18px;font-weight:800;letter-spacing:-.6px}.brand strong{color:var(--accent)}.brand-mark,.welcome-icon,.login-logo{background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:800;border-radius:12px}.brand-mark{height:33px;width:33px}.new-chat{width:100%;background:var(--accent);color:#fff;border:0;border-radius:12px;padding:13px 16px;display:flex;gap:9px;align-items:center;font-weight:700}.new-chat:hover,.primary-btn:hover{filter:brightness(.95)}.sidebar-caption{padding:29px 12px 10px;font-size:12px;color:var(--muted);font-weight:700}.conv-list{overflow:auto;flex:1;min-height:0}.conv-entry{display:flex;align-items:center;border-radius:10px;gap:2px;margin:2px 0}.conv-entry.active{background:var(--accent-soft)}.conv-open{border:0;background:none;color:var(--text);text-align:left;min-width:0;flex:1;padding:12px 10px;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conv-delete{opacity:.65;flex-shrink:0}.conv-entry:hover{background:var(--surface2)}.icon-btn{display:grid;place-items:center;border:0;color:var(--text);background:none;width:35px;height:35px;border-radius:8px}.icon-btn:hover{background:var(--surface2)}.sidebar-footer{border-top:1px solid var(--line);padding:19px 10px 0}.usage-label,.account{display:flex;align-items:center;justify-content:space-between;gap:8px}.usage-label{font-size:12px;color:var(--muted)}.usage-label strong{font-weight:700;color:var(--text)}.usage-track{height:6px;border-radius:9px;background:var(--surface2);overflow:hidden;margin:12px 0 21px}.usage-track span{display:block;height:100%;width:0;background:var(--accent);border-radius:9px;transition:width .3s}.account-email{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px;color:var(--muted)}.text-btn{border:0;background:none;color:var(--accent);white-space:nowrap;font-size:12px}.main{min-width:0;min-height:0;flex:1;display:flex;flex-direction:column}.topbar{height:66px;flex-shrink:0;border-bottom:1px solid var(--line);background:var(--surface);display:flex;align-items:center;justify-content:space-between;padding:0 30px}.header-start{display:flex;gap:12px;align-items:center;min-width:0}.header-title{font-size:15px;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.share-btn{border:1px solid var(--line);background:var(--surface);border-radius:9px;padding:9px 13px;display:flex;align-items:center;gap:7px;color:var(--text);font-size:13px}.chat-scroll{flex:1;overflow:auto;min-height:0;overscroll-behavior:contain}.chat-inner{max-width:820px;margin:auto;padding:30px 26px 50px;min-height:100%}.empty-state{min-height:clamp(340px,57vh,600px);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.welcome-icon{width:59px;height:59px;border-radius:19px;font-size:27px;box-shadow:0 12px 30px #3d5afe29}.empty-state h1{font-size:clamp(25px,4vw,34px);letter-spacing:-1px;margin:25px 0 8px}.empty-state p{color:var(--muted);font-size:14px;margin:0 0 38px}.prompt-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px;width:min(100%,510px)}.prompt-chip{border:1px solid var(--line);background:var(--surface);color:var(--text);text-align:left;border-radius:13px;padding:19px;font-size:14px;box-shadow:0 2px 8px #1111}.prompt-chip:hover{border-color:var(--accent);background:var(--accent-soft)}.message{display:flex;margin:0 0 26px;min-width:0}.message.user{justify-content:flex-end}.bubble{max-width:min(85%,680px);padding:13px 17px;border-radius:14px;font-size:14px;line-height:1.8;overflow-wrap:anywhere;white-space:pre-wrap}.user .bubble{background:var(--accent);color:#fff;border-bottom-right-radius:4px}.assistant .bubble{padding:0 4px;background:transparent;max-width:100%;white-space:normal;width:100%}.answer{min-height:22px}.answer p{margin:0 0 12px}.answer h1,.answer h2,.answer h3{line-height:1.4;margin:18px 0 9px}.answer h1{font-size:21px}.answer h2{font-size:18px}.answer h3{font-size:16px}.answer ul,.answer ol{padding-left:24px;margin:5px 0 14px}.answer a{color:var(--accent);overflow-wrap:anywhere}.answer code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;background:var(--surface2);padding:2px 5px;border-radius:5px;font-size:.9em}.code-block{position:relative;margin:12px 0;border:1px solid var(--line);background:var(--surface2);border-radius:12px;overflow:hidden}.code-block pre{margin:0;overflow:auto;padding:36px 16px 15px;line-height:1.55}.code-block pre code{background:none;padding:0}.copy-code{position:absolute;right:9px;top:7px;display:flex;align-items:center;gap:4px;color:var(--muted);border:1px solid var(--line);background:var(--surface);border-radius:7px;padding:5px 8px;font-size:11px}.copy-code svg{height:13px;width:13px}.reasoning{margin-bottom:15px;color:var(--muted);font-size:13px;border:1px solid var(--line);border-radius:12px;padding:10px 13px}.reasoning summary{cursor:pointer;display:flex;align-items:center;gap:8px;list-style:none}.reasoning summary::-webkit-details-marker{display:none}.reasoning summary:after{content:'⌄';margin-left:auto}.reasoning[open] summary:after{content:'⌃'}.reasoning-body{white-space:pre-wrap;padding-top:12px;line-height:1.7;overflow-wrap:anywhere}.pulse-dot{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:pulse 1.2s infinite}.reasoning.done .pulse-dot{animation:none;opacity:.5}@keyframes pulse{50%{opacity:.2}}.limit-card{padding:19px;border:1px solid var(--line);border-radius:14px;background:var(--surface);margin:8px 0 25px}.limit-card h3{margin:0 0 8px;font-size:16px}.limit-card p{margin:6px 0;color:var(--muted);font-size:13px}.composer-wrap{padding:12px 26px 19px;background:linear-gradient(0deg,var(--bg) 85%,transparent)}.composer{max-width:770px;margin:auto;border:1px solid var(--line);background:var(--surface);border-radius:17px;box-shadow:var(--shadow);padding:13px 14px 11px}.model-row{display:flex;align-items:center;gap:12px;overflow-x:auto;padding-bottom:11px}.model-caption{white-space:nowrap;color:var(--muted);font-size:12px}.model-options{display:flex;gap:5px}.model-option{border:1px solid transparent;border-radius:9px;background:var(--surface2);color:var(--text);padding:7px 11px;white-space:nowrap;font-size:12px}.model-option[aria-pressed=true]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent);font-weight:700}.input-row{display:flex;gap:9px;align-items:flex-end}.input-row textarea{flex:1;min-width:0;resize:none;border:0;background:none;outline:none;color:var(--text);padding:10px 2px;max-height:190px;min-height:42px;line-height:1.5;overflow-y:auto;font-size:14px}.input-row textarea:focus-visible{outline:none}.send-btn,.stop-btn{flex-shrink:0;border:0;border-radius:11px;background:var(--accent);color:#fff;width:41px;height:41px;display:grid;place-items:center}.composer-note{text-align:center;font-size:11px;color:var(--muted);margin:10px auto 0}.mobile-only{display:none}.drawer-backdrop{position:fixed;inset:0;background:#0007;z-index:9}.modal-overlay{position:fixed;inset:0;background:#11182799;z-index:20;display:flex;align-items:center;justify-content:center;padding:20px}.login-modal{background:var(--surface);width:min(100%,410px);padding:36px;border-radius:23px;box-shadow:var(--shadow)}.login-logo{height:45px;width:45px;margin-bottom:25px}.login-modal h2{font-size:23px;letter-spacing:-.7px;margin:0 0 8px}.login-subtitle{font-size:14px;color:var(--muted);margin:0 0 28px}.login-modal label{display:block;font-size:13px;font-weight:700;margin-bottom:9px}.login-modal input{width:100%;padding:13px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--text);outline-color:var(--accent)}.turnstile-box{min-height:66px;margin:17px 0}.primary-btn{width:100%;padding:14px;border:0;background:var(--accent);color:#fff;border-radius:10px;font-weight:700}.back-btn{margin-top:16px}.form-error{color:#d34b53;font-size:13px;min-height:16px}.legal{color:var(--muted);font-size:11px;line-height:1.8;text-align:center;margin:22px 0 0}.legal a{color:inherit;text-underline-offset:3px}.toast{position:fixed;z-index:30;bottom:114px;left:50%;transform:translateX(-50%);padding:12px 19px;border-radius:10px;background:var(--text);color:var(--surface);box-shadow:var(--shadow);font-size:13px;white-space:nowrap}
@media(max-width:899px){.mobile-only{display:grid}.sidebar{position:fixed;inset:0 auto 0 0;z-index:10;transform:translateX(-100%);transition:transform .22s;width:min(84vw,310px);box-shadow:var(--shadow)}.sidebar.open{transform:translateX(0)}.close-drawer{margin-left:auto}.topbar{height:58px;padding:0 17px}.chat-inner{padding:20px 18px 35px}.composer-wrap{padding:9px 12px 13px}.empty-state{min-height:55vh}.empty-state p{max-width:280px;line-height:1.6}}
@media(max-width:410px){.prompt-grid{gap:8px}.prompt-chip{padding:15px 12px;font-size:12px}.model-row{gap:7px}.model-option{padding:7px 9px}.login-modal{border-radius:20px 20px 0 0;padding:30px 23px 24px;width:100%;max-height:95dvh;overflow:auto}.modal-overlay{align-items:flex-end;padding:0}.bubble{max-width:92%}}
.account-links{margin-top:10px;font-size:12px;color:var(--muted);display:flex;flex-wrap:wrap;gap:4px;align-items:center}.account-links a{color:var(--muted)}.account-links .text-btn{font-size:12px;padding:0}
.table-wrap{overflow-x:auto;margin:8px 0}.table-wrap table{border-collapse:collapse;font-size:14px;min-width:100%}.table-wrap th,.table-wrap td{border:1px solid var(--line);padding:6px 10px;text-align:left;white-space:nowrap}.table-wrap th{background:var(--surface2)}
.search-toggle{display:inline-flex;align-items:center;gap:5px;margin-left:8px;padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:13px}.search-toggle svg{width:15px;height:15px}.search-toggle[aria-pressed=true]{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}
.cite{display:inline-grid;place-items:center;min-width:18px;height:18px;padding:0 4px;margin:0 2px;border-radius:9px;background:var(--accent-soft);color:var(--accent);font-size:11px;font-weight:700;text-decoration:none;vertical-align:2px}
.sources{margin-top:12px;padding-top:10px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:6px;font-size:13px}.sources b{font-size:12px;color:var(--muted)}.sources a{display:flex;gap:8px;color:var(--text);text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sources a span{flex:0 0 18px;height:18px;border-radius:9px;background:var(--surface2);display:grid;place-items:center;font-size:11px}
.role-pick{display:inline-flex;align-items:center;gap:6px;margin-left:4px;font-size:12px;color:var(--muted);white-space:nowrap}.role-pick select{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:999px;padding:6px 10px;font:inherit;font-size:13px}
.invite-btn{width:100%;margin-top:12px;border:1px dashed var(--accent);background:var(--accent-soft);color:var(--accent);border-radius:10px;padding:9px 10px;font-size:12px;font-weight:700}