:root{--bg:#f3f5f4;--panel:#fff;--line:#e5e9e7;--text:#18211d;--muted:#6e7a74;--accent:#217a5b;--accent-soft:#e8f4ef;--incoming:#fff;--outgoing:#dff4e8;--danger:#9c3d3d;--shadow:0 1px 2px rgba(17,24,21,.05)}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg)}button,input,textarea{font:inherit}.app-shell{display:grid;grid-template-columns:minmax(300px,360px) minmax(0,1fr);height:100vh;overflow:hidden}.sidebar,.chat-pane{min-width:0;background:var(--panel)}.sidebar{border-right:1px solid var(--line);display:flex;flex-direction:column}.topbar{height:68px;display:flex;align-items:center;padding:0 18px;background:#fafbfa;border-bottom:1px solid var(--line)}.sidebar-topbar{justify-content:space-between}.brand{display:flex;align-items:center;gap:10px}.brand div{display:flex;flex-direction:column}.brand small,.chat-title small{color:var(--muted);margin-top:2px}.brand-mark{width:46px;height:46px;border-radius:13px;background:var(--text);color:#fff;display:grid;place-items:center;font-weight:800;font-size:22px}.brand-mark.small{width:38px;height:38px;border-radius:11px;font-size:18px}.icon-btn{border:0;background:transparent;color:var(--muted);font-size:20px;width:42px;height:42px;border-radius:10px;display:grid;place-items:center;text-decoration:none;cursor:pointer}.icon-btn:hover{background:#eef1ef}.search-wrap{padding:12px 14px 8px}.search-wrap input{width:100%;border:1px solid var(--line);background:#f6f8f7;border-radius:12px;padding:11px 13px;font-size:16px;outline:none}.search-wrap input:focus{border-color:#9bbcac;box-shadow:0 0 0 3px rgba(33,122,91,.08)}.sync-line{padding:2px 18px 10px;color:var(--muted);font-size:12px;display:flex;align-items:center;gap:7px}.sync-dot{width:7px;height:7px;border-radius:50%;background:#b5bdb9}.sync-dot.ok{background:#2b9d6f}.sync-dot.err{background:#c65555}.conversation-list{overflow:auto;flex:1}.conversation{width:100%;border:0;background:#fff;text-align:left;padding:13px 16px;display:grid;grid-template-columns:46px 1fr auto;gap:11px;align-items:center;border-top:1px solid #f0f2f1;cursor:pointer}.conversation:hover,.conversation.active{background:#f1f6f3}.avatar{width:42px;height:42px;border-radius:50%;background:#e4ece8;display:grid;place-items:center;font-weight:700;color:#456458;flex:0 0 auto}.conv-main{min-width:0}.conv-name{font-weight:650;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-preview{font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:4px}.conv-time{font-size:11px;color:var(--muted);align-self:start;margin-top:2px}.empty-list{padding:28px 18px;color:var(--muted);text-align:center}.chat-pane{position:relative;background:#eef1ef}.empty-chat{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:28px;color:var(--muted)}.empty-chat h2{margin:12px 0 4px;color:var(--text);font-size:22px}.empty-chat p{max-width:390px;line-height:1.5}.empty-icon{font-size:42px;filter:grayscale(1)}.chat-view{height:100%;display:flex;flex-direction:column}.hidden{display:none!important}.chat-topbar{gap:11px}.chat-title{display:flex;flex-direction:column;min-width:0;flex:1}.chat-title strong{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.window-badge{font-size:12px;border-radius:999px;padding:6px 9px;background:#eef1ef;color:var(--muted);white-space:nowrap}.window-badge.open{background:var(--accent-soft);color:var(--accent)}.window-badge.closed{background:#f6eaea;color:var(--danger)}.messages{flex:1;overflow:auto;padding:22px clamp(14px,4vw,48px);display:flex;flex-direction:column;gap:8px;background:linear-gradient(rgba(245,247,246,.91),rgba(245,247,246,.91)),radial-gradient(circle at 1px 1px,#d8dedb 1px,transparent 0);background-size:auto,22px 22px}.day-sep{align-self:center;background:rgba(255,255,255,.9);border:1px solid var(--line);color:var(--muted);font-size:11px;padding:5px 9px;border-radius:8px;margin:8px 0}.bubble{max-width:min(72%,620px);padding:9px 11px 7px;border-radius:12px;box-shadow:var(--shadow);font-size:14px;line-height:1.4;word-wrap:break-word;white-space:pre-wrap}.bubble.inbound{align-self:flex-start;background:var(--incoming);border-top-left-radius:4px}.bubble.outbound{align-self:flex-end;background:var(--outgoing);border-top-right-radius:4px}.bubble-meta{display:flex;justify-content:flex-end;gap:6px;color:#7d8882;font-size:10px;margin-top:4px}.window-notice{padding:9px 16px;background:#fbefef;color:var(--danger);font-size:12px;text-align:center;border-top:1px solid #efdada}.composer{display:flex;gap:9px;padding:10px 14px calc(10px + env(safe-area-inset-bottom));background:#fafbfa;border-top:1px solid var(--line);align-items:flex-end}.composer textarea{flex:1;min-height:44px;max-height:140px;resize:none;border:1px solid var(--line);border-radius:13px;padding:11px 13px;outline:none;background:#fff;font-size:16px;line-height:1.35}.composer textarea:focus{border-color:#96b6a7}.composer textarea:disabled{background:#f0f2f1;color:#919a95}.send-btn{border:0;background:var(--accent);color:#fff;width:44px;height:44px;border-radius:13px;font-size:19px;cursor:pointer}.send-btn:disabled{opacity:.4;cursor:not-allowed}.mobile-only{display:none}.login-body{display:grid;place-items:center;min-height:100vh;padding:22px;background:#f2f4f3}.login-card{width:min(100%,390px);background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px;box-shadow:0 14px 40px rgba(24,33,29,.08)}.login-card>div:first-of-type{margin-bottom:14px}.login-card h1{margin:10px 0 2px}.login-card p{margin:0 0 22px;color:var(--muted)}.login-card form{display:grid;gap:15px}.login-card label{font-size:13px;color:var(--muted);display:grid;gap:6px}.login-card input{border:1px solid var(--line);border-radius:11px;padding:12px 13px;font-size:16px}.primary-btn{border:0;border-radius:11px;background:var(--accent);color:#fff;padding:12px 16px;font-weight:650;cursor:pointer}.login-error{background:#f8eaea;color:var(--danger);padding:10px 12px;border-radius:10px;font-size:13px;margin-bottom:15px}@media(max-width:720px){.app-shell{display:block;height:100vh}.sidebar{height:100%;border:0}.chat-pane{position:absolute;inset:0;transform:translateX(100%);transition:transform .18s ease}.app-shell.chat-open .chat-pane{transform:translateX(0)}.mobile-only{display:grid}.conversation{grid-template-columns:46px 1fr auto}.bubble{max-width:86%}.window-badge{font-size:10px;padding:5px 7px}.chat-topbar{padding:0 10px}.messages{padding:16px 12px}}@media(prefers-reduced-motion:reduce){.chat-pane{transition:none}}