:root{--bg-primary: #0f172a;--bg-card: #1e293b;--bg-card-hover: #273548;--text-primary: #e2e8f0;--text-secondary: #94a3b8;--text-muted: #64748b;--accent-blue: #3b82f6;--accent-blue-hover: #2563eb;--accent-indigo: #6366f1;--user-bubble: #1e3a5f;--border-color: #334155;--error-red: #ef4444;--error-bg: #451a1a;--success-green: #22c55e;--header-h: 56px;--input-h: 72px;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 16px;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;--font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, 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