:root{--color-surface:#fff;--color-surface-secondary:#f7f7f8;--color-background-primary-ghost-hover:#ececec;--color-text:#0d0d0d;--color-text-secondary:#5f5f5f;--color-text-tertiary:#8e8e8e;--color-border:#e3e3e3;--color-border-strong:#d9d9d9;--color-accent:#10a37f;--color-accent-soft:#d2f0e8;--color-brand-orange:#f97316;--radius-md:8px;--radius-lg:12px;--spacing:4px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono:ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;font-family:var(--font-sans);color:var(--color-text);-webkit-font-smoothing:antialiased}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{overflow:hidden}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-thumb{background:#d1d1d1;border-radius:5px}::-webkit-scrollbar-track{background:0 0}.sidebar{background:var(--color-surface-secondary);border-right:1px solid var(--color-border);flex-direction:column;flex-shrink:0;width:260px;display:flex;position:relative}.app-menu{gap:2px;padding:8px 12px 4px;display:flex}.app-menu-item{color:var(--color-text-secondary);border-radius:6px;padding:3px 8px;font-size:13px}.app-menu-item:hover{background:var(--color-background-primary-ghost-hover)}.sidebar-head{gap:6px;padding:8px 12px;display:flex}.new-btn{border:1px solid var(--color-border-strong);border-radius:var(--radius-md);color:var(--color-text);background:var(--color-surface);flex:1;justify-content:center;align-items:center;gap:8px;padding:7px 10px;font-size:13px;font-weight:500;display:flex}.new-btn:hover{background:var(--color-background-primary-ghost-hover)}.new-btn .icon{color:var(--color-text-secondary)}.new-btn.chat-active{background:var(--color-surface);border-color:#d0d0d0}.nav-section{padding:8px 12px 2px}.section-label{color:var(--color-text-tertiary);padding:0 8px 6px;font-size:12px;font-weight:500}.nav-item{text-align:left;width:100%;color:var(--color-text-secondary);border-radius:var(--radius-md);align-items:center;gap:10px;padding:7px 8px;font-size:13px;display:flex}.nav-item:hover{background:var(--color-background-primary-ghost-hover);color:var(--color-text)}.nav-item.active{background:var(--color-background-primary-ghost-hover);color:var(--color-text);font-weight:500}.nav-item .icon{color:var(--color-text-tertiary);flex-shrink:0}.nav-item.active .icon{color:var(--color-text-secondary)}.nav-text{text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden}.latest-list{flex-direction:column;gap:1px;display:flex}.thread-item{position:relative}.thread-actions{visibility:hidden}.thread-item:hover .thread-actions{visibility:visible}.close-x{color:var(--color-text-tertiary);border-radius:4px;padding:2px;display:inline-flex}.close-x:hover{color:var(--color-text);background:#dcdcdc}.empty-hint{color:var(--color-text-tertiary);padding:4px 8px;font-size:12px}.sidebar-spacer{flex:1}.sidebar-footer{border-top:1px solid var(--color-border);padding:8px;position:relative}.profile-wrap{align-items:center;gap:4px;display:flex}.profile-btn{text-align:left;border-radius:var(--radius-md);flex:1;align-items:center;gap:10px;min-width:0;padding:6px;display:flex}.profile-btn:hover{background:var(--color-background-primary-ghost-hover)}.avatar{background:var(--color-brand-orange);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:26px;height:26px;font-size:12px;font-weight:600;display:inline-flex}.profile-text{flex-direction:column;flex:1;min-width:0;line-height:1.15;display:flex}.profile-email{color:var(--color-text);text-overflow:ellipsis;white-space:nowrap;font-size:13px;font-weight:500;overflow:hidden}.profile-email+.profile-email{color:var(--color-text-tertiary);font-size:12px;font-weight:400}.plan-tag{color:var(--color-text-secondary);border:1px solid var(--color-border-strong);border-radius:999px;width:fit-content;margin-top:2px;padding:1px 7px;font-size:10px;font-weight:600}.q-btn{color:var(--color-text-tertiary);cursor:pointer;border-radius:6px;padding:6px;display:inline-flex}.q-btn:hover{background:var(--color-background-primary-ghost-hover);color:var(--color-text)}.profile-menu{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);z-index:100;width:280px;padding:8px;animation:.12s ease-out menu-in;position:absolute;bottom:calc(100% + 6px);left:8px;box-shadow:0 8px 24px #0000001f}@keyframes menu-in{0%{opacity:0;transform:translateY(4px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.menu-head{align-items:flex-start;gap:10px;padding:8px;display:flex}.menu-avatar{width:32px;height:32px;font-size:14px}.menu-head .plan-tag{margin-top:4px}.menu-separator{background:var(--color-border);height:1px;margin:6px 4px}.menu-item{text-align:left;width:100%;color:var(--color-text);border-radius:var(--radius-md);align-items:center;gap:10px;padding:8px;font-size:13px;display:flex;position:relative}.menu-item:hover{background:var(--color-background-primary-ghost-hover)}.menu-item .icon{color:var(--color-text-secondary)}.submenu{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);z-index:110;width:160px;padding:6px;position:absolute;top:0;left:calc(100% + 4px);box-shadow:0 8px 24px #0000001f}.menu-item.sub{justify-content:center}.chat{background:var(--color-surface);flex-direction:column;flex:1;min-width:0;display:flex}.chat-header{border-bottom:1px solid var(--color-border);flex-shrink:0;justify-content:space-between;align-items:center;padding:10px 16px;display:flex}.chat-header-left,.chat-header-right{align-items:center;gap:8px;display:flex}.chat-title{color:var(--color-text);font-size:14px;font-weight:600}.tool-btn{color:var(--color-text-secondary);border-radius:6px;justify-content:center;align-items:center;padding:5px;display:inline-flex}.tool-btn:hover{background:var(--color-background-primary-ghost-hover);color:var(--color-text)}.icon-only{width:28px;height:28px}.icon{display:inline-flex}.new-chat-btn{color:var(--color-text);border:1px solid var(--color-border-strong);border-radius:var(--radius-md);background:var(--color-surface);padding:6px 10px;font-size:13px;font-weight:500}.new-chat-btn:hover{background:var(--color-background-primary-ghost-hover)}.chat-scroll{flex:1;min-height:0;overflow-y:auto}.chat-body{max-width:820px;margin:0 auto;padding:40px 24px}.empty-state{text-align:center;padding:60px 0}.empty-title{color:var(--color-text);margin:0 0 12px;font-size:24px;font-weight:600}.empty-sub{color:var(--color-text-secondary);margin:0;font-size:15px;line-height:1.5}.message-list{flex-direction:column;gap:6px;display:flex}.bubble-row{align-items:flex-start;gap:10px;display:flex}.bubble-avatar{color:#fff;background:#111;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:26px;height:26px;font-size:12px;font-weight:600;display:inline-flex}.bubble-row.user .bubble{align-self:flex-end}.bubble-row.user{justify-content:flex-end;margin-top:8px}.bubble{flex-direction:column;gap:6px;max-width:100%;display:flex}.bubble-row.user .bubble{background:#eef5f2;border:1px solid #d8e8e1;border-radius:14px;padding:10px 14px}.bubble-text{color:var(--color-text);white-space:pre-wrap;word-break:break-word;margin:0;font-family:inherit;font-size:14px;line-height:1.6}.bubble-row.user .bubble-text{color:#0d0d0d}.bubble-actions{gap:2px;display:flex}.act-btn{color:var(--color-text-tertiary);border-radius:4px;padding:4px;display:inline-flex}.act-btn:hover{background:var(--color-background-primary-ghost-hover);color:var(--color-text-secondary)}.typing{gap:4px;padding:10px 0;display:flex}.typing span{background:var(--color-text-tertiary);border-radius:50%;width:7px;height:7px;animation:1.2s infinite blink}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}@keyframes blink{0%,60%,to{opacity:.3}30%{opacity:1}}.composer{flex-shrink:0;padding:12px 16px 20px}.composer-box{border:1px solid var(--color-border-strong);background:var(--color-surface);border-radius:16px;max-width:820px;margin:0 auto;padding:10px 12px;transition:border-color .15s;box-shadow:0 2px 8px #0000000d}.composer-box:focus-within{border-color:#b0b0b0}.composer-input{resize:none;width:100%;color:var(--color-text);background:0 0;border:none;outline:none;max-height:160px;padding:4px 0;font-family:inherit;font-size:14px;line-height:1.5}.composer-tools{justify-content:space-between;align-items:center;gap:8px;padding-top:6px;display:flex}.composer-tip{color:var(--color-text-tertiary);font-size:12px}.composer-toolbtns{align-items:center;gap:4px;display:flex}.send-btn{color:var(--color-text-secondary)}.send-btn:disabled{opacity:.4;cursor:default}.send-btn:not(:disabled):hover{color:var(--color-accent);background:var(--color-accent-soft)}.app-shell{background:var(--color-surface);width:100%;height:100vh;color:var(--color-text);display:flex}