:root{--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--space-2xs: 2px;--space-xs: 4px;--space-sm: 8px;--space-md: 12px;--space-lg: 16px;--space-xl: 20px;--space-2xl: 24px;--space-3xl: 32px;--color-bg: #f8fafc;--color-surface: #ffffff;--color-surface-subtle: #f1f5f9;--color-surface-hover: #e2e8f0;--color-surface-active: #cbd5e1;--color-border: #e2e8f0;--color-border-subtle: #f1f5f9;--color-border-focus: #4f46e5;--color-text-primary: #0f172a;--color-text-secondary: #475569;--color-text-muted: #94a3b8;--color-text-inverse: #ffffff;--color-brand: #4f46e5;--color-brand-hover: #4338ca;--color-brand-active: #3730a3;--color-brand-subtle: #eef2ff;--color-accent: #7c3aed;--color-accent-hover: #6d28d9;--color-accent-subtle: #f5f3ff;--color-online: #10b981;--color-success: #10b981;--color-success-subtle: #ecfdf5;--color-success-hover: #059669;--color-warning: #f59e0b;--color-warning-subtle: #fffbeb;--color-warning-hover: #d97706;--color-danger: #ef4444;--color-danger-subtle: #fef2f2;--color-danger-hover: #dc2626;--color-offline: #94a3b8;--color-bubble-incoming-bg: #ffffff;--color-bubble-incoming-text: #0f172a;--color-bubble-incoming-border: rgba(15, 23, 42, .08);--color-bubble-outgoing-bg: #4f46e5;--color-bubble-outgoing-text: #ffffff;--shadow-xs: 0 1px 2px rgba(15, 23, 42, .04);--shadow-sm: 0 1px 3px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);--shadow-md: 0 4px 6px -1px rgba(15, 23, 42, .07), 0 2px 4px -2px rgba(15, 23, 42, .05);--shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, .08), 0 4px 6px -4px rgba(15, 23, 42, .04);--shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, .1), 0 8px 10px -6px rgba(15, 23, 42, .05);--shadow-bubble: 0 1px 2px rgba(15, 23, 42, .06);--shadow-drawer: -4px 0 24px rgba(15, 23, 42, .08);--radius-xs: 4px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-bubble: 18px;--radius-full: 9999px;--sidebar-width: 320px;--header-height: 64px;--composer-min-height: 68px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-spring: .3s cubic-bezier(.34, 1.56, .64, 1)}[data-theme=dark]{--color-bg: #090d16;--color-surface: #0f172a;--color-surface-subtle: #1e293b;--color-surface-hover: #263349;--color-surface-active: #334155;--color-border: #1e293b;--color-border-subtle: #141d2e;--color-border-focus: #6366f1;--color-text-primary: #f8fafc;--color-text-secondary: #94a3b8;--color-text-muted: #64748b;--color-text-inverse: #0f172a;--color-brand: #6366f1;--color-brand-hover: #818cf8;--color-brand-active: #4f46e5;--color-brand-subtle: rgba(99, 102, 241, .12);--color-accent: #a855f7;--color-accent-hover: #c084fc;--color-accent-subtle: rgba(168, 85, 247, .15);--color-online: #10b981;--color-success: #10b981;--color-success-subtle: rgba(16, 185, 129, 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.6)}.app-container{display:flex;width:100vw;height:100vh;height:100dvh;overflow:hidden;position:relative;background-color:var(--color-bg)}.sidebar-pane{width:var(--sidebar-width);min-width:var(--sidebar-width);height:100%;background-color:var(--color-surface);border-right:1px solid var(--color-border);display:flex;flex-direction:column;z-index:20;transition:transform var(--transition-normal)}.chat-pane{flex:1;height:100%;display:flex;flex-direction:column;position:relative;overflow:hidden;background-color:var(--color-bg);background-image:radial-gradient(rgba(0,0,0,.04) 1px,transparent 1px);background-size:20px 20px}[data-theme=dark] .chat-pane{background-color:var(--color-bg);background-image:radial-gradient(rgba(255,255,255,.03) 1px,transparent 1px);background-size:20px 20px}.mobile-sidebar-overlay{display:none}@media(max-width:768px){.sidebar-pane{position:absolute;top:0;left:0;bottom:0;width:280px;min-width:280px;box-shadow:var(--shadow-drawer);transform:translate(-100%)}.sidebar-pane.open{transform:translate(0)}.mobile-sidebar-overlay.open{display:block;position:absolute;top:0;right:0;bottom:0;left:0;background:#0006;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:15}.chat-pane{width:100vw}}.auth-wrapper{width:100vw;height:100vh;height:100dvh;display:flex;align-items:center;justify-content:center;background-color:var(--color-bg);padding:16px}.auth-card{width:100%;max-width:400px;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:36px 32px;box-shadow:var(--shadow-xl);display:flex;flex-direction:column;gap:20px;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);animation:authFadeIn .22s ease-out}@keyframes authFadeIn{0%{opacity:0;transform:translateY(6px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.auth-header{text-align:center;display:flex;flex-direction:column;align-items:center;gap:8px}.auth-logo{width:48px;height:48px;border-radius:var(--radius-md);background:var(--color-brand-subtle);color:var(--color-brand);display:flex;align-items:center;justify-content:center;margin-bottom:4px}.auth-title{font-size:20px;font-weight:600;color:var(--color-text-primary);letter-spacing:-.02em}.auth-subtitle{font-size:13px;color:var(--color-text-secondary)}.auth-error{padding:10px 14px;border-radius:var(--radius-sm);background-color:var(--color-danger-subtle);color:var(--color-danger);font-size:13px;line-height:1.4;border:1px solid var(--color-danger);border-opacity:.2}.auth-form{display:flex;flex-direction:column;gap:16px}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:12px;font-weight:500;color:var(--color-text-secondary)}.form-input{width:100%;height:42px;padding:0 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var(--transition-fast)}.footer-btn:hover{color:var(--color-text-primary);background-color:var(--color-surface-hover)}.footer-btn.logout:hover{color:var(--color-danger);background-color:var(--color-danger-subtle)}.chat-header{height:var(--header-height);padding:0 20px;border-bottom:1px solid var(--color-border);display:flex;align-items:center;justify-content:space-between;background-color:var(--color-surface);z-index:10}.chat-header-left{display:flex;align-items:center;gap:12px}.menu-toggle-btn{display:none;width:36px;height:36px;border-radius:var(--radius-sm);align-items:center;justify-content:center;background-color:var(--color-surface-subtle);color:var(--color-text-secondary)}@media(max-width:768px){.menu-toggle-btn{display:flex}.chat-header{padding:0 12px}.header-btn-label{display:none!important}.chat-header-actions{gap:6px}.chat-header-actions .footer-btn{padding:0 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typingDotBounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1.1);opacity:1}}@media(prefers-reduced-motion:reduce){.status-typing-dot{animation:none;opacity:.8}}.chat-header-actions{display:flex;align-items:center;gap:8px}.chat-body-container{flex:1;overflow-y:auto;display:flex;align-items:center;justify-content:center;padding:24px}.chat-empty-state{max-width:380px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:12px}.empty-icon-wrap{width:64px;height:64px;border-radius:var(--radius-lg);background-color:var(--color-surface-subtle);border:1px solid var(--color-border);color:var(--color-brand);display:flex;align-items:center;justify-content:center;margin-bottom:4px}.empty-title{font-size:17px;font-weight:600;color:var(--color-text-primary)}.empty-desc{font-size:13px;color:var(--color-text-secondary);line-height:1.5}.empty-badge{font-size:11px;font-weight:500;padding:4px 10px;border-radius:var(--radius-full);background-color:var(--color-surface-subtle);border:1px solid var(--color-border);color:var(--color-text-muted)}.chat-composer-wrap{padding:12px 20px;border-top:1px solid var(--color-border);background-color:var(--color-surface)}.composer-bar{display:flex;align-items:center;gap:8px;background-color:var(--color-surface-subtle);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:6px 10px}.composer-action-btn{width:34px;height:34px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:var(--color-text-muted);cursor:not-allowed;opacity:.6}.composer-input-placeholder{flex:1;font-size:13px;color:var(--color-text-muted);padding:6px 4px}.composer-send-btn{width:34px;height:34px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;background-color:var(--color-brand);color:var(--color-text-inverse);cursor:not-allowed;opacity:.6}.status-dot.online{background-color:var(--color-online)}.status-dot.offline{background-color:var(--color-offline)}.status-typing-text{color:var(--color-brand);font-weight:600;font-style:italic;animation:typingPulse 1.2s infinite ease-in-out}@keyframes typingPulse{0%{opacity:.6}50%{opacity:1}to{opacity:.6}}.chat-search-container{background-color:var(--color-surface);border-bottom:1px solid var(--color-border);padding:8px 16px;position:relative;z-index:30;animation:searchSlideDown .14s ease-out}@keyframes searchSlideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.chat-search-bar{max-width:820px;margin:0 auto;display:flex;align-items:center;gap:8px;background-color:var(--color-surface-subtle);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:4px 10px}.search-icon{font-size:13px;color:var(--color-text-muted)}.search-input{flex:1;background:transparent;color:var(--color-text-primary);font-size:13px;padding:4px 2px}.search-clear-btn{color:var(--color-text-muted);font-size:12px;padding:2px 4px;cursor:pointer}.search-clear-btn:hover{color:var(--color-text-primary)}.search-close-btn{font-size:12px;font-weight:500;color:var(--color-brand);padding:2px 6px;cursor:pointer}.search-results-dropdown{position:absolute;top:calc(100% + 4px);left:16px;right:16px;max-width:820px;margin:0 auto;max-height:280px;overflow-y:auto;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:50;padding:6px 0}.search-count-header{font-size:11px;font-weight:600;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.04em;padding:6px 14px 4px}.search-result-item{padding:8px 14px;border-bottom:1px solid var(--color-border-subtle);cursor:pointer;transition:background-color var(--transition-fast)}.search-result-item:last-child{border-bottom:none}.search-result-item:hover{background-color:var(--color-surface-hover)}.search-result-text{font-size:13px;color:var(--color-text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.search-result-time{font-size:10.5px;color:var(--color-text-muted);margin-top:2px}.search-loading-line,.search-empty-line{display:flex;align-items:center;gap:8px;padding:12px 16px;font-size:12px;color:var(--color-text-muted);justify-content:center}.network-banner{display:flex;align-items:center;justify-content:center;gap:8px;padding:6px 16px;font-size:12px;font-weight:500;line-height:1.4;text-align:center;transition:all var(--transition-normal);z-index:40;border-bottom:1px solid transparent}.network-banner.banner-offline{background-color:#ef44441f;color:var(--color-danger);border-bottom-color:#ef444440}.network-banner.banner-reconnecting{background-color:#3b82f61f;color:var(--color-brand);border-bottom-color:#3b82f640}.network-banner.banner-online{background-color:#10b9811f;color:var(--color-online);border-bottom-color:#10b98140}.network-banner.banner-update{background-color:var(--color-brand-subtle);color:var(--color-brand);border-bottom-color:var(--color-border);gap:12px}.banner-action-btn{background-color:var(--color-brand);color:#fff;padding:3px 10px;border-radius:var(--radius-xs);font-size:11px;font-weight:600;cursor:pointer;transition:opacity var(--transition-fast)}.banner-action-btn:hover{opacity:.9}.toast-container{position:absolute;top:14px;left:50%;transform:translate(-50%);z-index:80;display:flex;flex-direction:column;gap:8px;pointer-events:none;max-width:90%}.toast-notification{pointer-events:auto;display:flex;align-items:center;gap:8px;padding:6px 14px;border-radius:var(--radius-full);background-color:var(--color-surface);color:var(--color-text-primary);border:1px solid var(--color-border);box-shadow:var(--shadow-md);font-size:12px;font-weight:500;animation:toastSlideDown .18s ease-out}@keyframes toastSlideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}@media(min-width:1200px){.messages-inner-wrap{max-width:920px;margin:0 auto;width:100%}}.chat-window-pane{flex:1;min-height:0;display:flex;flex-direction:column;position:relative;overflow:hidden}.chat-drag-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:50;background-color:#2563eb14;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border:2px dashed var(--color-brand);border-radius:var(--radius-md);margin:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;pointer-events:none;animation:fadeIn .15s ease-out}.chat-drag-icon{width:54px;height:54px;border-radius:var(--radius-full);background-color:var(--color-brand-subtle);color:var(--color-brand);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm)}.chat-drag-text{font-size:15px;font-weight:600;color:var(--color-brand)}.chat-messages-viewport{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;overscroll-behavior-y:contain;-webkit-overflow-scrolling:touch;padding:16px 20px;display:flex;flex-direction:column;position:relative}.messages-inner-wrap{width:100%;max-width:820px;margin:auto auto 0;display:flex;flex-direction:column;gap:8px;min-height:100%}.date-divider{display:flex;align-items:center;justify-content:center;margin:14px 0 8px}.date-divider-pill{font-size:11px;font-weight:500;padding:3px 10px;border-radius:var(--radius-full);background-color:var(--color-surface-subtle);color:var(--color-text-secondary);border:1px solid 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var(--transition-fast)}.edit-composer-close-btn:hover{color:var(--color-text-primary);background-color:var(--color-surface-hover)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}.modal-card{width:100%;max-width:440px;background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;overflow:hidden;animation:modalFadeIn .15s ease-out}@keyframes modalFadeIn{0%{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}.modal-header{padding:16px 20px;border-bottom:1px solid var(--color-border);display:flex;align-items:center;justify-content:space-between}.modal-title{font-size:15px;font-weight:600;color:var(--color-text-primary)}.modal-close-btn{width:28px;height:28px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:var(--color-text-secondary);transition:background-color var(--transition-fast)}.modal-close-btn:hover{background-color:var(--color-surface-hover);color:var(--color-text-primary)}.modal-body{padding:20px;display:flex;flex-direction:column;gap:20px}.settings-section{display:flex;flex-direction:column;gap:8px}.settings-label{font-size:12px;font-weight:600;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.04em}.settings-value-box{padding:10px 14px;background-color:var(--color-surface-subtle);border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:13px;color:var(--color-text-primary);word-break:break-all}.segmented-control{display:flex;background-color:var(--color-surface-subtle);padding:3px;border-radius:var(--radius-sm);border:1px solid var(--color-border);gap:4px}.segmented-btn{flex:1;padding:7px 12px;border-radius:calc(var(--radius-sm) - 2px);font-size:13px;font-weight:500;color:var(--color-text-secondary);transition:all var(--transition-fast);text-align:center}.segmented-btn.active{background-color:var(--color-surface);color:var(--color-text-primary);box-shadow:var(--shadow-sm)}.modal-footer{padding:14px 20px;border-top:1px solid var(--color-border);display:flex;align-items:center;justify-content:flex-end;background-color:var(--color-surface-subtle)}.modal-action-btn{padding:8px 16px;border-radius:var(--radius-sm);font-size:13px;font-weight:500;background-color:var(--color-brand);color:var(--color-text-inverse);transition:background-color var(--transition-fast)}.modal-action-btn:hover{background-color:var(--color-brand-hover)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;width:100%;font-family:var(--font-sans);background-color:var(--color-bg);color:var(--color-text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden;overscroll-behavior-y:none}#root{height:100%;width:100%;display:flex}button{font-family:inherit;font-size:inherit;border:none;background:none;cursor:pointer;color:inherit;touch-action:manipulation}input,textarea{font-family:inherit;font-size:inherit;color:inherit;border:none;outline:none}a{color:inherit;text-decoration:none}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}