:root{--shell-bg: #f6f7fb;--shell-card: #ffffff;--shell-ink: #1b1f27;--shell-muted: #6b7280;--shell-border: #dde3ee;--shell-accent: #153a5b;--mobile-header-height: 68px;--mobile-radius: 18px;--mobile-tab-bar-height: 64px;--chat-bubble-assistant: #f0f0f0;--chat-code-bg: rgba(0, 0, 0, .06);--chat-error-bg: #fff2e8;--chat-error-border: #ff4d4f;--chat-warning-bg: #fffbe6;--chat-warning-border: #faad14;--chat-caution-bg: #fff7e6;--chat-caution-border: #fa8c16}:root.dark-mode{--shell-bg: #121418;--shell-card: #1b1f27;--shell-ink: #e5e7eb;--shell-muted: #9ca3af;--shell-border: #2d3340;--shell-accent: #3b82f6;--chat-bubble-assistant: #2d3340;--chat-code-bg: rgba(255, 255, 255, .1);--chat-error-bg: #3d1f1f;--chat-error-border: #ff4d4f;--chat-warning-bg: #3d3420;--chat-warning-border: #faad14;--chat-caution-bg: #3d2e1f;--chat-caution-border: #fa8c16}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica 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