:root{--bg: #ffffff;--panel: #f8f8f8;--panel-2: #f4f5f7;--text: #1f2329;--muted: #8a8f98;--line: #e9eaee;--brand: #fa6d4d;--brand-dark: #df5b39;--brand-soft: #fff1ea;--blue: #4b8dff;--shadow: 0 20px 60px rgba(31, 35, 41, .08);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{color:var(--text);background:var(--bg)}button{font:inherit;border:0;background:none;cursor:pointer;color:inherit}button:disabled{cursor:not-allowed;opacity:.55}.booting,.login-shell{min-height:100%;display:grid;place-items:center;background:radial-gradient(circle at 20% 10%,#fff1ea 0,transparent 24%),#fff}.login-card{width:min(440px,calc(100vw - 40px));padding:42px;border-radius:28px;background:#ffffffe0;box-shadow:var(--shadow);border:1px solid var(--line)}.login-logo{width:58px;height:58px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,#ff4d58,#ff7a4d);color:#fff;font-weight:900;margin-bottom:20px}.login-card h1{margin:0 0 8px;font-size:28px}.login-card p{margin:0 0 28px;color:var(--muted);line-height:1.7}.login-card form{display:grid;gap:14px}.login-card input{height:52px;border-radius:14px;border:1px solid var(--line);padding:0 16px;outline:none;font-size:16px;background:#fff}.login-card input:focus{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}.login-card button{height:52px;border-radius:14px;background:var(--brand);color:#fff;font-weight:800;margin-top:6px}.login-error,.inline-error{color:#d93025;margin-top:14px;font-size:14px}.app-shell{height:100vh;display:flex;overflow:hidden;background:#fff}.sidebar{width:310px;flex:0 0 310px;background:#fafafa;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:18px 14px;transition:width .18s ease,flex-basis .18s ease}.sidebar.collapsed{width:76px;flex-basis:76px;align-items:center}.profile-row{display:flex;align-items:center;gap:12px;height:42px;padding:0 8px}.avatar,.msg-avatar{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:800;background:linear-gradient(135deg,#ff4658,#ff8757);box-shadow:0 4px 12px #fa6d4d3d}.profile-name{font-weight:700}.profile-role{color:var(--muted);font-size:12px;margin-top:2px}.nav-block{display:grid;gap:8px;margin-top:20px}.nav-item{height:48px;border-radius:14px;padding:0 12px;display:flex;align-items:center;gap:12px;color:#20242a;font-size:17px;text-align:left}.nav-item:hover,.nav-item.active{background:#fff;box-shadow:0 8px 26px #1118270f}.nav-icon{width:22px;text-align:center;font-size:21px}kbd{margin-left:auto;font-size:13px;color:#a0a5ad;font-family:inherit}.history{margin-top:26px;padding:0 6px;overflow:auto}.history-title{color:#a0a5ad;font-size:13px;padding:0 8px 8px}.history-item{width:100%;height:38px;border-radius:12px;padding:0 8px;display:flex;align-items:center;gap:8px;color:#555b66;text-align:left}.history-item span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.history-item:hover,.history-item.current{background:#fff}.delete-session{margin-left:auto;color:#b2b7c1;opacity:0}.history-item:hover .delete-session{opacity:1}.empty-history{padding:12px 8px;color:#b2b7c1;font-size:13px}.sidebar-footer{margin-top:auto;border-top:1px solid var(--line);padding:14px 4px 0}.footer-item{width:100%;height:40px;border-radius:12px;padding:0 12px;display:flex;align-items:center;justify-content:center;gap:8px;color:#6b7280;font-weight:600}.footer-item:hover{background:#fff;color:var(--brand-dark)}.sidebar.collapsed .footer-item{width:42px;padding:0}.main-panel{flex:1;min-width:0;display:flex;flex-direction:column;position:relative;background:#fff}.topbar{height:60px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 26px 0 22px;flex-shrink:0}.collapse-btn{width:34px;height:34px;border-radius:10px;font-size:22px}.collapse-btn:hover{background:var(--panel-2)}.top-title{position:absolute;left:50%;transform:translate(-50%);text-align:center;font-weight:600}.top-title small{display:block;color:#c8ccd3;font-size:12px;margin-top:3px;font-weight:400}.top-new-chat-btn{height:40px;padding:0 18px;border-radius:16px;border:1px solid var(--line);display:flex;align-items:center;gap:8px;background:#fff;font-weight:700;color:var(--text);box-shadow:0 8px 24px #1118270a}.top-new-chat-btn:hover{border-color:#ffd1c1;background:var(--brand-soft);color:var(--brand-dark)}.chat-stage{flex:1;overflow:auto;padding:0 28px 190px;scroll-behavior:smooth}.welcome{min-height:100%;display:grid;place-items:center;align-content:center;text-align:center}.welcome h1{margin:0;font-size:clamp(34px,4vw,52px);letter-spacing:.02em}.welcome p{color:var(--muted);margin:16px 0 28px}.starter-grid{display:grid;grid-template-columns:repeat(2,minmax(220px,1fr));gap:12px;width:min(720px,100%)}.starter-grid button{border:1px solid var(--line);border-radius:18px;padding:18px 20px;background:#fff;text-align:left;box-shadow:0 10px 30px #1118270a;color:#555b66}.starter-grid button:hover{border-color:#ffd1c1;background:var(--brand-soft);color:var(--brand-dark)}.message-list{width:min(880px,100%);margin:36px auto 0;display:grid;gap:24px}.message-row{display:flex;gap:14px;align-items:flex-start}.message-row.user{flex-direction:row-reverse}.message-row.user .message-bubble{background:#f4f7ff;border-color:#e4ecff}.message-bubble{max-width:min(740px,calc(100% - 56px));padding:16px 18px;border:1px solid var(--line);background:#fff;border-radius:18px;line-height:1.75;box-shadow:0 10px 26px #1118270a}.message-content pre{overflow:auto;background:#111827;color:#f9fafb;padding:14px;border-radius:12px}.msg-attachments{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}.msg-attachments span,.citation-tag{display:inline-flex;align-items:center;max-width:260px;padding:5px 10px;border-radius:999px;background:var(--panel-2);color:#667085;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.citations{margin-top:12px;display:flex;flex-wrap:wrap;gap:8px}.cursor-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--brand);animation:pulse 1s infinite}.status-line{text-align:center;color:var(--muted);font-size:13px}.composer-wrap{position:absolute;left:50%;bottom:26px;transform:translate(-50%);width:min(980px,calc(100% - 64px));z-index:10}.attachment-strip{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 8px}.attachment-chip{display:inline-flex;align-items:center;gap:8px;max-width:260px;padding:7px 10px;border-radius:999px;background:#fff;border:1px solid #dbeafe;box-shadow:0 8px 22px #4b8dff1f;color:#3b5b9a}.attachment-chip button{color:#7c8aa5;font-size:16px}.composer{border:1.5px solid #b8d0ff;background:#fff;border-radius:30px;box-shadow:0 22px 70px #3461b41f;padding:16px 18px 12px}.composer textarea{width:100%;border:0;outline:0;resize:none;min-height:34px;font-size:19px;color:var(--text);font-family:inherit}.composer textarea::placeholder{color:#b4bac4}.composer-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.hidden-input{display:none}.round-btn,.mic-btn{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-size:26px}.round-btn:hover,.mic-btn:hover,.tool-btn:hover{background:var(--panel-2)}.tool-btn{height:34px;border-radius:10px;padding:0 6px;color:#2f3338;display:inline-flex;align-items:center;gap:4px}.mic-btn{margin-left:auto;background:#f4f4f5;font-size:16px}.send-btn{height:38px;border-radius:999px;padding:0 18px;background:var(--brand);color:#fff;font-weight:800}.send-btn.stop{background:#1f2329}.inline-error{background:#fff5f4;border:1px solid #ffd4ce;border-radius:12px;padding:9px 12px}@keyframes pulse{0%,to{opacity:.25;transform:scale(.8)}50%{opacity:1;transform:scale(1)}}@media (max-width: 920px){.sidebar{position:absolute;z-index:20;height:100%;transform:translate(0)}.sidebar.collapsed{transform:translate(-76px)}.top-title{display:none}.starter-grid{grid-template-columns:1fr}.composer-wrap{width:calc(100% - 28px);bottom:14px}.tool-btn{display:none}}