:root{--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, sans-serif;--font-serif: "Source Serif 4", "Tiempos Text", "Charter", "Georgia", Cambria, "Times New Roman", Times, serif;--font-mono: "JetBrains Mono", "SF Mono", "Fira Code", "Menlo", "Monaco", "Consolas", monospace;--font-display: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 20px;--sidebar-width: 312px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 12px;--spacing-lg: 16px;--spacing-xl: 20px;--spacing-2xl: 24px;--spacing-3xl: 32px;--spacing-4xl: 40px;--text-xs: 12px;--text-sm: 13px;--text-base: 14px;--text-md: 15px;--text-lg: 16px;--text-xl: 18px;--text-2xl: 20px;--text-3xl: 24px;--text-4xl: 30px;--text-5xl: 36px;--line-height-tight: 1.3;--line-height-normal: 1.5;--line-height-relaxed: 1.65;--safe-area-top: env(safe-area-inset-top, 0px);--safe-area-bottom: env(safe-area-inset-bottom, 0px);--mobile-tabbar-height: 64px;--mobile-tabbar-offset: calc(var(--mobile-tabbar-height) + var(--safe-area-bottom));--transition: .15s ease;--transition-fast: .1s ease;--transition-slow: .2s ease}:root[data-theme=light]{--accent: #0084FF;--accent-hover: #0071E3;--accent-text: #FFFFFF;--accent-subtle: rgba(0, 132, 255, .1);--danger: #FF3B30;--danger-subtle: rgba(255, 59, 48, .1);--warning: #FF9500;--success: #34C759;--success-subtle: rgba(52, 199, 89, .1);--sidebar-bg: #F5F5F5;--sidebar-text: #1A1A1A;--sidebar-text-dim: #8E8E93;--sidebar-border: #E2E2E2;--sidebar-hover: #EAEAEA;--sidebar-active: #DCDCDC;--chat-bg: #FFFFFF;--chat-input-bg: #F5F5F5;--chat-border: #E2E2E2;--msg-user-bg: #0084FF;--msg-user-text: #FFFFFF;--msg-assistant-bg: #F0F0F0;--msg-assistant-text: #1A1A1A;--surface-bg: #FFFFFF;--surface-elevated: #F5F5F5;--surface-border: #E2E2E2;--surface-muted: #F8F8F8;--surface-divider: #EBEBEB;--text-primary: #1A1A1A;--text-secondary: #4A4A4A;--text-muted: #9A9A9A}:root[data-theme=dark]{--accent: #2B66FF;--accent-hover: #4A7DFF;--accent-text: #FFFFFF;--accent-subtle: rgba(43, 102, 255, .16);--danger: #FF5D5D;--danger-subtle: rgba(255, 69, 58, .14);--warning: #FF9E37;--success: #5EE07A;--success-subtle: rgba(94, 224, 122, .14);--sidebar-bg: #0E0F12;--sidebar-text: #F4F6FA;--sidebar-text-dim: #848A95;--sidebar-border: #1B1E24;--sidebar-hover: #171A20;--sidebar-active: #1E222A;--chat-bg: #090A0D;--chat-input-bg: #15171B;--chat-border: #20242B;--msg-user-bg: linear-gradient(135deg, #2F6BFF 0%, #275CF2 46%, #1B49D5 100%);--msg-user-text: #FFFFFF;--msg-assistant-bg: rgba(27, 29, 34, .94);--msg-assistant-text: #F2F4F8;--surface-bg: #14161A;--surface-elevated: #1A1D22;--surface-border: #292D35;--surface-muted: #15181D;--surface-divider: #23272E;--text-primary: #F4F6FA;--text-secondary: #B8BDC7;--text-muted: #7D838E}html{transition:background-color var(--transition),color var(--transition)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;width:100%;max-width:100%}body{font-family:var(--font-sans);font-size:var(--text-md);line-height:var(--line-height-normal);color:var(--text-primary);background:var(--chat-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;letter-spacing:-.011em;font-feature-settings:"cv11","ss01","ss03","cv02","calt";font-optical-sizing:auto;text-rendering:optimizeLegibility;overflow-x:hidden}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:600;letter-spacing:-.02em}code,pre,kbd,samp{font-family:var(--font-mono);font-feature-settings:"liga","calt"}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;background:none;font-family:inherit;font-size:inherit;color:inherit}input,textarea{font-family:inherit;font-size:inherit;color:inherit}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--surface-border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.sidebar-scroll::-webkit-scrollbar{width:4px}.sidebar-scroll::-webkit-scrollbar-track{background:transparent}.sidebar-scroll::-webkit-scrollbar-thumb{background:var(--sidebar-border);border-radius:2px}.sidebar-scroll::-webkit-scrollbar-thumb:hover{background:var(--sidebar-active)}.chat-scroll::-webkit-scrollbar{width:5px}.chat-scroll::-webkit-scrollbar-track{background:transparent}.chat-scroll::-webkit-scrollbar-thumb{background:var(--chat-border);border-radius:3px}.chat-scroll::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}@keyframes spin{to{transform:rotate(360deg)}}.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.25);border-top-color:currentColor;border-radius:50%;animation:spin .7s linear infinite}.spinner--dark{border-color:var(--surface-border);border-top-color:var(--text-secondary)}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn var(--transition) forwards}