:root{color:#18211f;background:#f7f7f4;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px;line-height:1.5;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,input,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}.auth-view{display:grid;grid-template-columns:minmax(0,1fr) 420px;min-height:100vh}.brand-panel{display:flex;flex-direction:column;justify-content:center;padding:9vw;color:#fff;background:linear-gradient(#12211f33,#12211f8f),url(https://images.unsplash.com/photo-1548199973-03cce0bbc87b?auto=format&fit=crop&w=1600&q=80) center/cover}.brand-mark,.brand-inline span{display:grid;place-items:center;width:42px;height:42px;border-radius:8px;color:#fff;background:#147c64;font-weight:800}.brand-panel h1{margin:28px 0 12px;font-size:clamp(3rem,7vw,5.8rem);line-height:.95}.brand-panel p{max-width:560px;margin:0;color:#ffffffe0;font-size:1.2rem}.auth-panel{display:flex;flex-direction:column;justify-content:center;padding:48px;background:#fbfbf8}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;padding:5px;margin-bottom:28px;border:1px solid #deded6;border-radius:8px;background:#efefea}.auth-tabs button,.new-chat-button,.chat-list button,.user-box button,.prompt-grid button,.sources button{border:0;border-radius:7px;color:#26312f;background:transparent}.auth-tabs button{min-height:38px}.auth-tabs button.active{background:#fff;box-shadow:0 1px 4px #12211f14}.auth-form{display:grid;gap:16px}.auth-form label{display:grid;gap:7px;color:#4e5956;font-size:.92rem}.auth-form input{width:100%;min-height:46px;border:1px solid #d8d8d0;border-radius:8px;padding:0 14px;color:#18211f;background:#fff;outline:none}.auth-form input:focus,.composer textarea:focus{border-color:#147c64;box-shadow:0 0 0 3px #147c6424}.form-error{margin:0;color:#ba2f2f;font-size:.92rem}.primary-button,.send-button{border:0;border-radius:8px;color:#fff;background:#147c64;font-weight:700}.primary-button{min-height:48px}.chat-layout{display:grid;grid-template-columns:280px minmax(0,1fr);height:100vh;background:#fff}.sidebar{display:flex;flex-direction:column;min-height:0;padding:16px;color:#f7f7f4;background:#18211f}.sidebar-top,.brand-inline,.user-box,.chat-header,.composer{display:flex;align-items:center}.sidebar-top,.chat-header{justify-content:space-between}.brand-inline{gap:10px}.icon-button{width:38px;height:38px;border:1px solid rgba(255,255,255,.2);border-radius:8px;color:#fff;background:#ffffff14;font-size:1.4rem}.new-chat-button{min-height:42px;margin:22px 0 12px;color:#fff;background:#ffffff1a;text-align:left;padding:0 12px}.chat-list{display:grid;gap:6px;min-height:0;overflow:auto}.chat-list button{min-height:38px;padding:0 10px;color:#ffffffd1;text-align:left}.chat-list button span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-list button.active,.chat-list button:hover,.new-chat-button:hover{background:#ffffff24}.user-box{gap:10px;justify-content:space-between;margin-top:auto;padding-top:14px;border-top:1px solid rgba(255,255,255,.12)}.user-box div{min-width:0}.user-box strong,.user-box span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-box span{color:#ffffff9e;font-size:.82rem}.user-box button{flex:0 0 auto;min-height:34px;color:#fff;background:#ffffff1a}.chat-main{display:grid;grid-template-rows:auto minmax(0,1fr) auto;min-width:0;height:100vh;background:#fbfbf8}.chat-header{min-height:74px;padding:14px 28px;border-bottom:1px solid #e6e6de}.chat-header h1{margin:0;font-size:1.08rem}.chat-header p{margin:2px 0 0;color:#68736f;font-size:.9rem}.status-dot{border:1px solid #cddbd5;border-radius:999px;padding:4px 10px;color:#147c64;background:#eef8f3;font-size:.84rem}.message-list{min-height:0;overflow-y:auto;padding:34px max(22px,calc((100vw - 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