:root{--sidebar-width: 260px;--composer-btn-size: 36px;--composer-btn-gap: 12px;--radius-card: 24px;--brand-font: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;--sidebar-bg: #f7f7f8;--main-bg: #ffffff;--text-primary: #1a1a1b;--text-secondary: #6e6e73;--border-color: rgba(0, 0, 0, .06);--accent-orange: #ff9500;--accent-yellow: #ffcc00;--page-gradient: radial-gradient(900px 520px at 15% 18%, rgba(255, 170, 75, .28) 0%, transparent 62%), radial-gradient(760px 520px at 62% 12%, rgba(255, 235, 150, .26) 0%, transparent 58%), radial-gradient(880px 640px at 96% 22%, rgba(255, 205, 160, .2) 0%, transparent 60%), linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(255,255,255,1) 65%);--glass-bg-main: rgba(255, 255, 255, .68);--glass-bg-light: rgba(255, 255, 255, .36);--glass-bg-hover: rgba(255, 255, 255, .75);--glass-border: rgba(255, 255, 255, .22);--glass-border-hover: rgba(255, 255, 255, .32);--glass-blur-main: blur(26px) saturate(110%);--glass-blur-light: blur(16px) saturate(145%);--glass-shadow-main: 0 22px 52px rgba(0, 0, 0, .14), 0 1px 0 rgba(255, 255, 255, .25);--glass-shadow-card: 0 16px 34px rgba(0, 0, 0, .07), inset 0 1px 0 rgba(255, 255, 255, .18);--glass-shadow-btn: 0 14px 30px rgba(0, 0, 0, .04);--focus-ring-shadow: 0 0 0 3px rgba(255, 149, 0, .1);--focus-border-color: rgba(255, 149, 0, .4);--font-size-msg: .95rem;--msg-line-height: 1.65}.elder-mode{--font-size-msg: 1.2rem;--msg-line-height: 1.8;--composer-btn-size: 46px;--sidebar-width: 290px}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100vh;height:100dvh;font-family:var(--brand-font);background:var(--page-gradient);background-color:var(--sidebar-bg);color:var(--text-primary);overflow:hidden;-webkit-font-smoothing:antialiased}#root,.app{width:100%;height:100vh;height:100dvh;display:flex;position:relative;overflow:hidden}button{cursor:pointer;border:none;font-family:inherit;transition:all .2s}button:active{transform:scale(.97)}.icon{width:20px;height:20px;flex-shrink:0;display:inline-block;vertical-align:middle}.icon-sm{width:16px;height:16px;flex-shrink:0;display:inline-block;vertical-align:middle}.elder-mode .icon{width:24px;height:24px}.elder-mode .icon-sm{width:20px;height:20px}.login-overlay{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--page-gradient);background-color:var(--sidebar-bg);z-index:9999;padding:24px;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;overflow-y:auto}.login-overlay.show{opacity:1;visibility:visible}.login-card{width:400px;max-width:92%;padding:36px 32px;border-radius:28px;background:var(--glass-bg-main);border:1px solid var(--glass-border);backdrop-filter:var(--glass-blur-main);-webkit-backdrop-filter:var(--glass-blur-main);box-shadow:var(--glass-shadow-main)}.login-brand{text-align:center;margin-bottom:24px;font-size:1.4rem;font-weight:600}.login-brand .brand-zh{color:var(--accent-orange);font-size:1.15em}.login-brand .brand-en{color:#000;font-size:.85em;margin-left:4px}.login-title{font-size:1.15rem;font-weight:600;text-align:center;margin-bottom:6px}.login-desc{font-size:.9rem;color:var(--text-secondary);text-align:center;margin-bottom:24px;line-height:1.5}.login-message{padding:10px 14px;border-radius:10px;margin-bottom:16px;font-size:.85rem;display:flex;align-items:center;gap:8px}.login-message.error{background:#fee;color:#c33;border:1px solid #fcc}.login-message.success{background:#efe;color:#3a3;border:1px solid #cfc}.login-card .form-group{margin-bottom:16px}.login-card .form-group label{display:block;font-size:.85rem;font-weight:600;margin-bottom:5px;color:var(--text-primary)}.login-card .form-group input{width:100%;padding:11px 14px;border:1.5px solid rgba(0,0,0,.1);border-radius:10px;font-family:inherit;font-size:.95rem;outline:none;transition:border-color .2s;background:#fffc}.login-card .form-group input:focus{border-color:var(--accent-orange);box-shadow:var(--focus-ring-shadow)}.login-btn{width:100%;padding:12px;border-radius:24px;border:none;background:var(--accent-orange);color:#fff;font-size:.95rem;font-weight:600;cursor:pointer;box-shadow:0 8px 22px #ff95004d;transition:all .2s;margin-top:8px}.login-btn:hover{background:#ff8f00;transform:translateY(-1px)}.title-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.title-chip{display:flex;align-items:center;justify-content:center;gap:4px;padding:10px 6px;border-radius:12px;border:1.5px solid rgba(0,0,0,.08);background:#00000005;font-size:.88rem;font-weight:600;color:var(--text-primary);cursor:pointer;transition:all .2s}.title-chip:hover{border-color:#ff95004d;background:#ff95000a}.title-chip.active{border-color:var(--accent-orange);background:#ff95001a;color:var(--accent-orange);box-shadow:0 2px 8px #ff950026}.title-chip-icon{font-size:1.1rem}.custom-title-input{margin-top:8px;width:100%;padding:10px 14px;border:1.5px solid rgba(0,0,0,.1);border-radius:12px;font-size:.9rem;outline:none;background:#00000005;font-family:inherit}.custom-title-input:focus{border-color:var(--accent-orange)}.login-switch{text-align:center;margin-top:18px;font-size:.85rem;color:var(--text-secondary)}.switch-link{background:none;border:none;cursor:pointer;color:var(--accent-orange);font-weight:600;font-size:.85rem;margin-left:4px}.switch-link:hover{text-decoration:underline}.login-footer{position:absolute;bottom:0;left:0;right:0;padding:20px 0;font-size:.78rem;color:var(--text-secondary);text-align:center;pointer-events:none}@media (max-height: 680px){.login-card{padding:24px}.login-brand,.login-desc{margin-bottom:16px}.login-card .form-group{margin-bottom:12px}.login-footer{position:static;margin-top:16px}}.sidebar-user{padding:10px 14px;margin-bottom:6px;font-size:.85rem;font-weight:600;color:var(--text-primary);display:flex;align-items:center;gap:8px}.sidebar-user .user-avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,#ffecd2,#fcb69f);color:#b85c38;font-weight:700;font-size:.8rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}.sidebar-user-info{display:flex;flex-direction:column;min-width:0}.sidebar-user-name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-user-title{font-size:.7rem;font-weight:600;color:var(--accent-orange);background:#ff95001a;padding:1px 6px;border-radius:6px;width:fit-content;margin-top:1px}.sidebar{width:var(--sidebar-width);padding:24px 16px 16px;display:flex;flex-direction:column;position:fixed;left:16px;top:16px;bottom:16px;z-index:20;border:1px solid var(--glass-border);border-radius:28px;background:var(--glass-bg-main);backdrop-filter:var(--glass-blur-main);-webkit-backdrop-filter:var(--glass-blur-main);box-shadow:var(--glass-shadow-main);overflow:hidden}.brand-name{font-family:var(--brand-font);font-weight:600;font-size:1.4rem;margin-bottom:20px;display:inline-flex;align-items:baseline;gap:.15em;padding-left:12px;cursor:pointer}.brand-zh{color:var(--accent-orange);font-size:1.15em}.brand-en{font-size:.85em;letter-spacing:.02em;color:#000;margin-left:2px}.role-selector{margin:0 4px 16px;padding:4px;background:#0000000a;border-radius:14px;display:flex;gap:4px}.role-selector-btn{flex:1;padding:10px 8px;border-radius:11px;background:transparent;font-size:.85rem;font-weight:600;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;gap:5px;transition:all .25s ease}.role-selector-btn.active{background:#fff;color:var(--text-primary);box-shadow:0 2px 8px #00000014,0 1px 2px #0000000a}.role-selector-btn:hover:not(.active){background:#ffffff80;color:var(--text-primary)}.elder-mode .role-selector{padding:5px;border-radius:16px;margin-bottom:12px}.elder-mode .role-selector-btn{padding:12px 8px;font-size:1rem;border-radius:12px}.sidebar-nav{flex:1;min-height:0;display:flex;flex-direction:column;overflow-y:auto}.sidebar-section-title{font-size:.7rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;padding:16px 12px 6px}.sidebar-item{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:14px;background:transparent;color:var(--text-primary);font-size:.9rem;font-weight:500;text-align:left;width:100%;transition:all .2s;position:relative}.sidebar-item:hover{background:#0000000a}.sidebar-item.active{background:#ff95001f;box-shadow:inset 0 0 0 1px #ff950047;color:var(--accent-orange)}.sidebar-item .icon{color:var(--text-secondary)}.sidebar-item.active .icon{color:var(--accent-orange)}.sidebar-item .badge{margin-left:auto;background:var(--accent-orange);color:#fff;font-size:.7rem;font-weight:700;padding:2px 7px;border-radius:10px}.elder-mode .sidebar-item{padding:12px 14px;font-size:1rem}.elder-mode .sidebar-section-title{font-size:.8rem;padding:14px 12px 5px}.elder-mode .new-chat-btn{padding:12px 14px;font-size:.95rem}.elder-mode .brand-name{font-size:1.5rem;margin-bottom:16px}.elder-mode .room-name{font-size:.92rem}.elder-mode .room-preview{font-size:.78rem}.elder-mode .conv-title{font-size:.95rem}.sidebar-footer{padding-top:10px;border-top:1px solid rgba(0,0,0,.06);margin-top:auto;flex-shrink:0}.elder-mode .sidebar-footer{padding-top:8px}.elder-mode .sidebar-user{font-size:.95rem}.elder-mode .sidebar-footer .sidebar-item{font-size:.92rem;padding:10px 14px}.new-chat-btn{display:flex;align-items:center;gap:8px;width:100%;padding:12px 14px;border-radius:14px;background:var(--accent-orange);color:#fff;font-size:.9rem;font-weight:600;box-shadow:0 8px 20px #ff950040;margin-bottom:12px}.new-chat-btn:hover{background:#ff8f00;transform:translateY(-1px);box-shadow:0 12px 28px #ff95004d}.main-content{flex:1 1 0;height:100vh;height:100dvh;display:flex;flex-direction:column;position:relative;overflow:hidden;background:transparent;margin-left:calc(var(--sidebar-width) + 32px);width:calc(100vw - (var(--sidebar-width) + 32px));max-width:calc(100vw - (var(--sidebar-width) + 32px))}.main-content:before{content:"";position:absolute;top:-1px;right:-1px;bottom:-1px;left:-1px;pointer-events:none;background:radial-gradient(420px 280px at 24% 28%,rgba(255,255,255,.65) 0%,transparent 70%),radial-gradient(520px 360px at 78% 36%,rgba(255,255,255,.5) 0%,transparent 72%);mix-blend-mode:soft-light;opacity:.9}.home-page{flex:1;display:none;flex-direction:column;align-items:center;justify-content:center;padding:32px;position:relative;z-index:2;gap:8px}.home-page.active{display:flex}.identity-picker{display:flex;flex-direction:column;align-items:center;max-width:420px;width:100%;text-align:center}.identity-picker-emoji{font-size:3.2rem;margin-bottom:8px;animation:wave 1.5s ease-in-out infinite}@keyframes wave{0%,to{transform:rotate(0)}25%{transform:rotate(20deg)}50%{transform:rotate(-10deg)}75%{transform:rotate(15deg)}}.identity-picker-title{font-size:1.8rem;font-weight:800;margin:0 0 6px;background:linear-gradient(135deg,var(--accent-orange),#e06800);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.identity-picker-sub{font-size:1.05rem;color:var(--text-secondary);margin:0 0 24px}.identity-group{width:100%;margin-bottom:12px}.identity-group-label{font-size:.78rem;font-weight:700;color:var(--text-secondary);margin-bottom:8px;letter-spacing:.04em}.identity-group-row{display:flex;gap:10px;justify-content:center}.identity-group-row .identity-picker-btn{flex:1;max-width:160px}.identity-picker-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:100%}.identity-picker-btn-other{border-style:dashed!important}.identity-picker-btn{display:flex;flex-direction:column;align-items:center;gap:4px;padding:16px 8px;border-radius:16px;border:1.5px solid var(--border-color);background:var(--bg-primary);cursor:pointer;transition:all .18s;font-size:.9rem;font-weight:600;color:var(--text-primary)}.identity-picker-btn:hover{border-color:var(--accent-orange);background:#ff95000f;transform:translateY(-2px);box-shadow:0 4px 12px #ff95001f}.identity-picker-btn:active{transform:scale(.96)}.identity-picker-btn:disabled{opacity:.6;cursor:wait}.identity-picker-btn-emoji{font-size:1.8rem}.identity-picker-custom{display:flex;gap:8px;width:100%;margin-top:14px;animation:fadeIn .2s ease}.identity-picker-custom input{flex:1;padding:10px 14px;border:1.5px solid var(--border-color);border-radius:12px;font-size:.92rem;outline:none;font-family:inherit}.identity-picker-custom input:focus{border-color:var(--accent-orange)}.identity-picker-custom button{padding:10px 20px;border-radius:12px;border:none;background:linear-gradient(135deg,var(--accent-orange),#e08600);color:#fff;font-weight:700;font-size:.9rem;cursor:pointer}.identity-picker-custom button:disabled{opacity:.5;cursor:not-allowed}.elder-mode .identity-picker-title{font-size:2.2rem}.elder-mode .identity-picker-sub{font-size:1.2rem}.elder-mode .identity-picker-btn{padding:20px 10px;font-size:1.05rem}.elder-mode .identity-picker-btn-emoji{font-size:2.2rem}.session-bar{width:100%;max-width:700px;text-align:center;margin:4px 0 10px}.session-bar-label{font-size:.82rem;color:var(--text-secondary);margin-bottom:8px}.session-bar-label strong{color:var(--accent-orange)}.session-bar-chips{display:flex;flex-wrap:wrap;justify-content:center;gap:6px}.session-chip{display:flex;align-items:center;gap:3px;padding:5px 12px;border-radius:20px;border:1.5px solid var(--border-color);background:var(--bg-primary);font-size:.8rem;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:all .15s}.session-chip:hover{border-color:var(--accent-orange);color:var(--text-primary)}.session-chip.active{background:linear-gradient(135deg,var(--accent-orange),#e08600);border-color:transparent;color:#fff;box-shadow:0 2px 8px #ff950040}.session-chip-emoji,.elder-mode .session-bar-label{font-size:1rem}.elder-mode .session-chip{padding:7px 16px;font-size:.95rem}.elder-mode .session-chip-emoji{font-size:1.2rem}.welcome-title{font-size:2.8rem;font-weight:700;letter-spacing:-.02em;text-align:center;width:100%;max-width:900px}.welcome-slogan{font-size:1.05rem;font-weight:500;color:var(--text-secondary);letter-spacing:.12em;margin-bottom:36px;text-align:center}.home-tips{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%;max-width:620px;margin-bottom:32px;position:relative;z-index:2}.tip-card{display:flex;align-items:center;gap:12px;padding:16px 18px;border-radius:18px;border:1px solid rgba(0,0,0,.06);background:var(--glass-bg-main);-webkit-backdrop-filter:var(--glass-blur-light);backdrop-filter:var(--glass-blur-light);cursor:pointer;transition:all .2s;font-size:.9rem;line-height:1.4;color:var(--text-primary)}.tip-card:hover{background:var(--glass-bg-hover);border-color:#ff950040;box-shadow:0 8px 24px #0000000f;transform:translateY(-2px)}svg.tip-icon{width:32px;height:32px;flex-shrink:0;color:var(--accent-orange);opacity:.8}.tip-card small{color:var(--text-secondary);font-size:.78rem}.elder-mode .home-tips{gap:14px}.elder-mode .tip-card{padding:20px 22px;font-size:1.1rem;border-radius:22px}.elder-mode svg.tip-icon{width:38px;height:38px}.elder-mode .tip-card small{font-size:.95rem}@media (max-width: 860px){.home-tips{grid-template-columns:1fr;max-width:100%}}.home-composer{width:100%;max-width:720px;position:relative;z-index:2}.home-composer .chat-input{width:100%;padding:20px var(--composer-btn-gap);padding-bottom:calc(var(--composer-btn-gap) + var(--composer-btn-size) + var(--composer-btn-gap));border-radius:calc(var(--composer-btn-size) / 2 + 6px);border:1px solid var(--glass-border);background:var(--glass-bg-main);backdrop-filter:var(--glass-blur-main);-webkit-backdrop-filter:var(--glass-blur-main);box-shadow:var(--glass-shadow-card);font-size:.95rem;line-height:1.5;font-family:inherit;outline:none;resize:none;overflow-y:auto;scrollbar-width:none;min-height:120px;max-height:200px;color:var(--text-primary);transition:all .3s cubic-bezier(.4,0,.2,1)}.home-composer .chat-input:focus{border-color:#ff950066;background:#ffffffd9;box-shadow:0 22px 52px #0000002e,0 0 0 3px #ff95001a}.home-composer .chat-input::placeholder{color:#6e6e73b3}.elder-mode .home-composer .chat-input{font-size:1.15rem;min-height:140px;padding:24px var(--composer-btn-gap);padding-bottom:calc(var(--composer-btn-gap) + var(--composer-btn-size) + var(--composer-btn-gap))}.elder-mode .welcome-title{font-size:3.2rem}.composer-actions{position:absolute;left:var(--composer-btn-gap);right:var(--composer-btn-gap);bottom:calc(var(--composer-btn-gap) + 3px);display:flex;align-items:center;gap:8px}.composer-pill{height:var(--composer-btn-size);padding:0 12px;border-radius:999px;border:1px solid rgba(0,0,0,.1);background:transparent;color:#1a1a1ba6;font-size:.875rem;font-weight:500;display:inline-flex;align-items:center;gap:5px;white-space:nowrap}.composer-pill:hover{background:#0000000a;border-color:#00000026}.composer-pill.active{background:#ff95001a;border-color:#ff950080;color:var(--accent-orange)}.voice-pill{margin-left:auto}.voice-pill.recording{background:#ff950026;border-color:#ff95008c;color:var(--accent-orange);animation:voice-pulse 1.5s ease-in-out infinite}@keyframes voice-pulse{0%,to{box-shadow:0 0 #ff95004d}50%{box-shadow:0 0 0 8px #ff950000}}.send-pill{width:var(--composer-btn-size);height:var(--composer-btn-size);padding:0;border-radius:50%;background:#ff7a00b8;border:1px solid rgba(255,255,255,.24);color:#fff;-webkit-backdrop-filter:blur(14px) saturate(155%);backdrop-filter:blur(14px) saturate(155%);box-shadow:0 16px 34px #ff7a0042,0 10px 22px #0000001a;display:flex;align-items:center;justify-content:center;font-size:1rem}.send-pill:hover{background:#ff7a00e6;transform:translateY(-1px)}.send-pill:disabled{opacity:.5;cursor:not-allowed}.sending-dot{width:6px;height:6px;border-radius:50%;background:#fff;display:inline-block;animation:typingBounce 1s infinite}.elder-mode .composer-pill{height:var(--composer-btn-size);font-size:1rem;padding:0 16px}.elder-mode .send-pill{width:var(--composer-btn-size);height:var(--composer-btn-size);font-size:1.2rem}.elder-mode .voice-pill{font-size:1rem}.chat-page{flex:1;display:none;flex-direction:column;padding:16px 32px 0;position:relative;z-index:2;min-height:0;overflow:hidden}.chat-page:before{content:"";position:absolute;top:0;left:0;right:0;height:36px;background:linear-gradient(to bottom,#ffffff 0%,transparent 100%);z-index:4;pointer-events:none}.chat-page:after{content:"";position:absolute;bottom:0;left:0;right:0;height:24px;background:linear-gradient(to top,rgba(255,255,255,.8) 0%,transparent 100%);z-index:4;pointer-events:none}.chat-page.active{display:flex}.chat-topbar{display:flex;align-items:center;gap:12px;padding:8px 4px 16px;position:relative;z-index:5}.agent-tag{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:999px;background:var(--glass-bg-main);border:1px solid var(--glass-border);-webkit-backdrop-filter:var(--glass-blur-light);backdrop-filter:var(--glass-blur-light);font-size:.85rem;font-weight:600;color:var(--text-primary);box-shadow:var(--glass-shadow-btn)}.agent-tag .tag-dot{width:7px;height:7px;border-radius:50%;background:#34c759}.topbar-right{margin-left:auto;display:flex;gap:6px}.topbar-btn{width:34px;height:34px;border-radius:50%;background:var(--glass-bg-light);border:1px solid var(--glass-border);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;font-size:.95rem;-webkit-backdrop-filter:var(--glass-blur-light);backdrop-filter:var(--glass-blur-light)}.topbar-btn:hover{background:var(--glass-bg-hover);border-color:var(--glass-border-hover)}.elder-mode .agent-tag{font-size:1rem;padding:8px 18px}.elder-mode .topbar-btn{width:42px;height:42px;font-size:1.1rem}.chat-scroll{flex:1;overflow-y:auto;padding:8px 0 24px;position:relative;z-index:2;scrollbar-width:thin;scrollbar-color:rgba(0,0,0,.1) transparent;scroll-behavior:smooth;min-height:0}.chat-scroll::-webkit-scrollbar{width:5px}.chat-scroll::-webkit-scrollbar-thumb{background:#0000001a;border-radius:3px}.messages-list{max-width:900px;margin:0 auto;padding:0 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