:root{--ecu-bg: #ffffff;--ecu-fg: #1f2328;--ecu-muted: #6b7280;--ecu-accent: #2563eb;--ecu-accent-fg: #ffffff;--ecu-border: #e5e7eb;--ecu-bubble-user: #eef2ff;--ecu-bubble-assistant: #f8fafc;--ecu-code-bg: #f3f4f6;--ecu-radius: 10px;--ecu-font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--ecu-mono: ui-monospace, SFMono-Regular, Menlo, monospace;--ecu-content-max: 72rem}@media(prefers-color-scheme:dark){:root{--ecu-bg: #111418;--ecu-fg: #e6e8eb;--ecu-muted: #9aa1a9;--ecu-accent: #3b82f6;--ecu-accent-fg: #ffffff;--ecu-border: #2a2f36;--ecu-bubble-user: #1c2433;--ecu-bubble-assistant: #171b21;--ecu-code-bg: #1c2128}}[data-ecu-theme=dark]{--ecu-bg: #111418;--ecu-fg: #e6e8eb;--ecu-muted: #9aa1a9;--ecu-accent: #3b82f6;--ecu-accent-fg: #ffffff;--ecu-border: #2a2f36;--ecu-bubble-user: #1c2433;--ecu-bubble-assistant: #171b21;--ecu-code-bg: 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