:root{--bg:#212121;--panel:#171717;--panel2:#2f2f2f;--text:#f4f4f4;--muted:#a6a6a6;--line:#3a3a3a;--accent:#10a37f;--hover:#2a2a2a;--input:#2f2f2f;--shadow:0 18px 60px rgba(0,0,0,.25)}
html[data-theme="light"]{--bg:#fff;--panel:#f7f7f8;--panel2:#fff;--text:#202123;--muted:#6b6c7b;--line:#dedede;--accent:#0d8f71;--hover:#ececf1;--input:#fff;--shadow:0 12px 35px rgba(0,0,0,.10)}
*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}.app-shell{height:100vh;display:flex;overflow:hidden}.sidebar{width:280px;flex:0 0 280px;background:var(--panel);display:flex;flex-direction:column;padding:12px;border-right:1px solid rgba(127,127,127,.12)}.brand{display:flex;align-items:center;gap:10px;padding:5px 4px 13px}.brand img{width:42px;height:42px;border-radius:10px;object-fit:cover}.brand div{min-width:0}.brand strong{display:block;font-size:15px}.brand span{display:block;color:var(--muted);font-size:11px;margin-top:2px}.new-chat{width:100%;border:1px solid var(--line);background:transparent;color:var(--text);border-radius:10px;padding:11px 13px;text-align:left;cursor:pointer;font-weight:600}.new-chat:hover,.history-open:hover,.side-link:hover{background:var(--hover)}.history-head{padding:21px 8px 8px}.history-head span{display:block;font-size:12px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}.history-head small{display:block;color:var(--muted);font-size:10px;margin-top:3px}.history-list{overflow:auto;flex:1}.history-item{display:flex;align-items:center;border-radius:8px}.history-open{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;border:0;background:transparent;color:var(--text);padding:10px;text-align:left;cursor:pointer;border-radius:8px}.history-delete{opacity:0;border:0;background:transparent;color:var(--muted);font-size:19px;cursor:pointer;padding:5px 9px}.history-item:hover .history-delete{opacity:1}.empty-history{color:var(--muted);font-size:12px;padding:10px}.sidebar-bottom{border-top:1px solid var(--line);padding-top:10px}.guest-note{padding:8px}.guest-note b,.guest-note span{display:block}.guest-note b{font-size:13px}.guest-note span{font-size:11px;color:var(--muted);margin-top:4px;line-height:1.4}.side-link{display:block;padding:10px;border-radius:8px;margin-top:5px;text-align:center;font-size:13px}.side-link.primary{background:var(--accent);color:white}.account-card{display:flex;gap:9px;align-items:center;padding:8px}.account-card small,.account-card b{display:block}.account-card small{color:var(--muted);font-size:10px}.avatar,.msg-avatar{display:grid;place-items:center;border-radius:50%;font-weight:700}.avatar{width:32px;height:32px;background:var(--accent);color:#fff}.main{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 16px}.model-name{font-weight:700}.model-name span{color:var(--muted);font-size:11px;font-weight:500;margin-left:6px}.top-actions{display:flex;gap:8px;align-items:center}.top-link{font-size:13px;padding:8px 12px;border-radius:8px}.top-link:hover{background:var(--hover)}.top-link.filled{background:var(--text);color:var(--bg)}.icon-btn{border:0;background:transparent;color:var(--text);font-size:18px;width:38px;height:38px;border-radius:9px;cursor:pointer}.icon-btn:hover{background:var(--hover)}.mobile-only{display:none}.chat{flex:1;overflow:auto}.welcome{min-height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:40px 20px 130px}.welcome img{width:95px;height:95px;border-radius:22px;object-fit:cover;box-shadow:var(--shadow)}.welcome h1{font-size:30px;margin:24px 0 8px}.welcome p{color:var(--muted);max-width:650px;line-height:1.6;margin:0}.suggestions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:27px;width:min(660px,100%)}.suggestions button{border:1px solid var(--line);background:transparent;color:var(--text);border-radius:13px;padding:15px;text-align:left;cursor:pointer}.suggestions button:hover{background:var(--hover)}#messages{padding-bottom:30px}.message{width:100%}.message.user{background:transparent}.message.assistant{background:rgba(127,127,127,.055)}.message-inner{max-width:790px;margin:0 auto;padding:23px 20px;display:grid;grid-template-columns:36px 1fr;gap:14px;line-height:1.65}.msg-avatar{width:31px;height:31px;background:var(--panel2);border:1px solid var(--line);font-size:12px}.assistant .msg-avatar{background:var(--accent);color:#fff;border:0}.msg-content{overflow-wrap:anywhere}.thinking .msg-content span{display:inline-block;width:7px;height:7px;background:var(--muted);border-radius:50%;margin:9px 3px 0 0;animation:pulse 1s infinite}.thinking .msg-content span:nth-child(2){animation-delay:.15s}.thinking .msg-content span:nth-child(3){animation-delay:.3s}@keyframes pulse{0%,100%{opacity:.25}50%{opacity:1}}.composer-wrap{padding:8px 18px 14px;background:linear-gradient(transparent,var(--bg) 20%)}.composer{max-width:790px;margin:0 auto;display:flex;align-items:flex-end;gap:8px;background:var(--input);border:1px solid var(--line);border-radius:24px;padding:9px 10px 9px 16px;box-shadow:var(--shadow)}.composer textarea{resize:none;max-height:180px;min-height:28px;flex:1;border:0;outline:0;background:transparent;color:var(--text);font:inherit;line-height:1.45;padding:5px 0}.composer button{border:0;border-radius:50%;width:36px;height:36px;background:var(--text);color:var(--bg);cursor:pointer;font-size:16px}.composer button:disabled{opacity:.35}.composer-wrap>small{display:block;text-align:center;color:var(--muted);font-size:10px;margin-top:7px}.auth-body{min-height:100%;display:grid;place-items:center;padding:24px;background:var(--bg)}.auth-card{width:min(440px,100%);background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:28px;box-shadow:var(--shadow)}.auth-logo img{width:100%;max-height:130px;object-fit:contain;border-radius:15px}.auth-card h1{text-align:center;margin:20px 0 6px}.auth-card>p{text-align:center;color:var(--muted);font-size:13px}.auth-card label{display:block;font-size:12px;color:var(--muted);margin:13px 0}.auth-card input{width:100%;margin-top:6px;padding:12px;border-radius:9px;border:1px solid var(--line);background:var(--bg);color:var(--text);outline:none}.auth-btn{width:100%;border:0;border-radius:9px;background:var(--accent);color:#fff;padding:12px;font-weight:700;cursor:pointer}.auth-alt a{color:var(--accent);font-weight:700}.guest-link{display:block;text-align:center;margin-top:15px;font-size:13px}.error{background:#7f1d1d;color:#fff;border-radius:8px;padding:10px;font-size:12px;margin:14px 0}
@media(max-width:800px){.sidebar{position:fixed;z-index:20;inset:0 auto 0 0;transform:translateX(-100%);transition:.22s;box-shadow:var(--shadow)}.sidebar.open{transform:translateX(0)}.mobile-only{display:block}.model-name span{display:none}.top-link{display:none}.welcome h1{font-size:25px}.suggestions{grid-template-columns:1fr}.message-inner{padding:18px 14px}.composer-wrap{padding-left:10px;padding-right:10px}}