:root{--bg:#f7f7f5;--panel:#fff;--side:#f0efec;--line:#e5e2dc;--text:#1d1d1f;--muted:#78736c;--ok:#24784a;--err:#ad4338;--warn:#9a6b18}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg)}button,input,textarea,select{font:inherit}.hidden{display:none!important}.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(380px,100%);background:#fff;border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:0 24px 80px #00000012}.logo,.brandmark,.orb{display:grid;place-items:center;background:#1c1c1d;color:#fff;font-weight:800}.logo{width:48px;height:48px;border-radius:15px}.login-card h1{margin:18px 0 4px;letter-spacing:-.03em}.login-card p{margin:0 0 22px;color:var(--muted)}.login-card input{width:100%;padding:12px 13px;border:1px solid var(--line);border-radius:12px;margin:0 0 10px;outline:none}.login-card input:focus{border-color:#aaa39a}.login-card button{width:100%;border:0;background:#1c1c1d;color:white;padding:12px;border-radius:12px;cursor:pointer}.error{color:var(--err);font-size:13px;margin-top:10px}.app{height:100vh;display:flex;overflow:hidden}.sidebar{width:280px;background:var(--side);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:16px 14px}.brand{display:flex;align-items:center;gap:10px;padding:4px 7px 18px}.brandmark{width:34px;height:34px;border-radius:11px}.brand b,.brand span{display:block}.brand span{font-size:12px;color:var(--muted)}.primary-soft,.side-footer button{border:1px solid var(--line);background:#ffffffb8;border-radius:12px;padding:11px 12px;text-align:left;cursor:pointer}.conv-list{flex:1;overflow:auto;margin:12px 0}.conv{padding:10px 11px;border-radius:10px;cursor:pointer;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv:hover{background:#e5e3de}.conv.active{background:#dcd9d3;font-weight:650}.conv small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.side-footer{display:grid;gap:7px}.main{position:relative;flex:1;min-width:0;background:#fff;display:flex;flex-direction:column}.topbar{min-height:68px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:center;padding:8px 150px 8px 18px}.topbar-center{display:flex;align-items:center;gap:10px;min-width:0}.provider-tabs{display:flex;background:#f3f2ef;border:1px solid var(--line);padding:4px;border-radius:13px}.provider-tabs button{border:0;background:transparent;padding:8px 13px;border-radius:9px;cursor:pointer;color:#5e5953;font-weight:650;white-space:nowrap}.provider-tabs button.active{background:#fff;color:#171717;box-shadow:0 1px 4px #00000014}.provider-tabs button.off{opacity:.42}.giga-controls{display:flex;gap:6px}.giga-controls select{border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 9px;color:#514d47;max-width:220px}.user-badge{position:absolute;right:20px;font-size:12px;color:var(--muted)}.chat-scroll{flex:1;overflow:auto}.empty{height:100%;min-height:460px;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:24px}.orb{width:56px;height:56px;border-radius:18px;font-size:22px}.empty h1{font-size:30px;letter-spacing:-.04em;margin:15px 0 6px}.empty p{color:var(--muted);margin:0;max-width:620px}.messages{width:min(860px,calc(100% - 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