:root{--color-bg: #ffffff;--color-bg-subtle: #f7f7f8;--color-bg-elevated: #ffffff;--color-user-bubble: #f3f3f4;--color-text: #12182b;--color-text-secondary: #6b7280;--color-text-tertiary: #9ca3af;--color-text-inverse: #ffffff;--color-mira-blue: #1e6bff;--color-mira-blue-soft: #eef4ff;--color-mira-pink: #f7a8c0;--color-mira-pink-soft: #fdf0f5;--color-success: #22c55e;--color-success-soft: #ecfdf3;--color-danger: #ef4444;--color-danger-soft: #fef2f2;--color-border: #e8e8ec;--color-border-strong: #d4d4d8;--color-ring: rgba(18, 24, 43, .08);--font-sans: "SF Pro Text", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;--font-mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;--text-xs: 12px;--text-sm: 13px;--text-base: 15px;--text-md: 16px;--text-lg: 18px;--text-xl: 22px;--text-display: 40px;--leading-tight: 1.25;--leading-normal: 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