:root{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#273943;background:#f5f7f7;font-synthesis:none;text-rendering:optimizeLegibility;--ink:#273943;--muted:#70838b;--line:#dfe6e7;--teal:#087f78;--mint:#dcfae4;--surface:#fff;--space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}.shell{min-height:100vh;display:grid;grid-template-columns:280px minmax(0,1fr)}.sidebar{background:#fff;border-right:1px solid var(--line);padding:24px 18px;display:flex;flex-direction:column;min-height:100vh}.brand{display:flex;align-items:center;gap:12px;padding:2px 8px 28px}.brand-mark{width:38px;height:38px;border-radius:12px;background:#0d9488;color:white;display:grid;place-items:center;font-weight:750;font-size:20px}.brand strong{display:block;font-size:15px}.brand small{display:block;color:var(--muted);font-size:12px;margin-top:4px}.panel{border-top:1px solid var(--line);padding-top:22px}.section-heading{display:flex;align-items:center;justify-content:space-between;padding:0 4px 12px}.section-heading h2{font-size:13px;margin:0;color:#64767e;font-weight:650}.icon-button,.text-button{border:0;background:transparent;color:#667b83;cursor:pointer;min-width:36px;min-height:36px;border-radius:9px;font-size:18px}.icon-button:hover,.text-button:hover{background:#f0f5f4}.client-list{display:grid;gap:7px}.client{border:1px solid transparent;background:transparent;border-radius:10px;padding:11px 12px;text-align:left;display:flex;align-items:center;gap:10px;cursor:pointer;color:var(--ink);min-height:48px}.client:hover{background:#f4f8f7}.client.active{background:#e8f6f2;border-color:#c5e8dd}.client-name{font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1}.dot{width:8px;height:8px;flex:none;border-radius:50%;background:#b8c4c7}.dot.online{background:#10a878;box-shadow:0 0 0 3px #dff5ea}.empty-clients{color:var(--muted);font-size:12px;line-height:1.6;padding:8px}.sidebar-bottom{margin-top:auto}.privacy-note{font-size:11px;color:#70838b;line-height:1.55;background:#f4f8f7;border-radius:10px;padding:11px 12px;margin:0 0 16px}.shield{color:#15946e;margin-right:5px}.account{border-top:1px solid var(--line);padding:16px 4px 0;display:flex;gap:9px;align-items:center;font-size:12px}.avatar{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:#d9f0e9;color:#087f78;font-weight:700}.account #account-name{flex:1;overflow:hidden;text-overflow:ellipsis}.text-button{font-size:12px;min-width:auto;padding:0 8px}.workspace{min-width:0;display:flex;flex-direction:column;height:100vh;max-height:100vh}.topbar{height:76px;flex:none;background:rgba(255,255,255,.86);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 34px}.eyebrow{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#8a9aa0;margin-bottom:5px}.topbar h1{font-size:16px;font-weight:650;margin:0}.connection{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:8px}.connection i{width:8px;height:8px;border-radius:50%;background:#bbc7ca}.connection.online i{background:#12a878}.messages{flex:1;overflow-y:auto;overscroll-behavior:contain;padding:36px max(24px,calc((100% - 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48px));margin:0 auto;padding:12px 14px 10px;background:#fff;border:1px solid #d7e1e2;border-radius:15px;box-shadow:0 8px 30px #2c494b0a}.composer:focus-within{border-color:#83c8b8;box-shadow:0 0 0 2px #dff4ed}.composer textarea{resize:none;display:block;width:100%;max-height:180px;min-height:50px;padding:10px 8px;border:0;outline:0;font:inherit;font-size:14px;line-height:1.6;color:var(--ink);background:transparent}.composer textarea::placeholder{color:#99a7ab}.composer-footer{display:flex;align-items:center;justify-content:space-between;padding:4px 2px 0 8px;color:#94a1a5;font-size:11px}.send-button{display:flex;gap:9px;align-items:center;border:0;border-radius:9px;padding:9px 13px;background:#087f78;color:white;font-size:12px;cursor:pointer}.send-button:disabled{background:#b7c7c6;cursor:not-allowed}.send-button:not(:disabled):hover{background:#066e68}.footnote{text-align:center;color:#94a1a5;font-size:10px;margin:12px 0 14px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.login-gate{position:fixed;inset:0;background:#f2f7f5;display:grid;place-items:center;padding:20px}.login-gate[hidden]{display:none}.login-card{max-width:390px;width:100%;background:white;border:1px solid var(--line);border-radius:18px;padding:34px;text-align:center;box-shadow:0 18px 60px #153b3710}.login-card .brand-mark{margin:auto}.login-card h1{font-size:20px;margin:20px 0 10px}.login-card p{font-size:13px;line-height:1.7;color:var(--muted);margin:0 0 22px}.login-button{display:block;text-decoration:none;border-radius:10px;background:#087f78;color:white;padding:13px;font-size:14px;font-weight:600}.login-card small{display:block;color:#89989c;font-size:11px;margin-top:16px}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,12px);opacity:0;pointer-events:none;background:#273943;color:white;border-radius:9px;padding:10px 14px;font-size:12px;transition:opacity .16s,transform .16s}.toast.show{opacity:1;transform:translate(-50%,0)}:focus-visible{outline:2px solid #0d9488;outline-offset:2px}@media(max-width:760px){.shell{grid-template-columns:1fr;grid-template-rows:auto minmax(0,1fr)}.sidebar{min-height:0;padding:13px 16px 10px;border-right:0;border-bottom:1px solid var(--line)}.brand{padding:0 3px 12px}.brand-mark{width:34px;height:34px}.panel{border-top:1px solid var(--line);padding-top:10px}.section-heading{padding:0 2px 5px}.section-heading h2{font-size:12px}.client-list{display:flex;overflow:auto;gap:7px}.client{min-height:38px;white-space:nowrap;padding:7px 10px;border:1px solid var(--line);flex:none}.client-name{max-width:150px}.empty-clients{padding:5px}.sidebar-bottom{display:none}.workspace{height:auto;min-height:0;max-height:none}.topbar{height:60px;padding:0 18px}.messages{min-height:44vh;max-height:none;padding:24px 18px;scrollbar-gutter:auto}.welcome{margin:5vh auto 3vh}.welcome h2{font-size:19px}.welcome p{font-size:13px}.suggestions button{padding:10px}.composer{width:calc(100% - 28px);margin:0 auto}.footnote{margin-bottom:9px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}