:root{--primary: #2563eb;--primary-dark: #1d4ed8;--primary-light: #dbeafe;--bg: #f5f5f5;--bg-white: #ffffff;--bg-sidebar: #171717;--bg-sidebar-hover: #262626;--bg-sidebar-active: #333333;--text: #1e293b;--text-secondary: #64748b;--text-light: #94a3b8;--text-sidebar: #e5e5e5;--text-sidebar-dim: #a3a3a3;--border: #e2e8f0;--border-light: #f1f5f9;--assistant-bg: #ffffff;--user-bg: #f0f4ff;--shadow-sm: 0 1px 2px rgba(0,0,0,.05);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1);--shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1);--radius: 12px;--radius-sm: 8px;--radius-lg: 16px;--max-width: 760px;--sidebar-width: 260px;--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--metallic-accent: #58A6FF;--metallic-dark: #30363D;--metallic-light: 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svg{animation:pulse 1.5s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.engine-toggle.disabled{opacity:.5;cursor:not-allowed}.engine-count{font-size:11px;color:var(--text-light);font-weight:400}.engine-toggle.active .engine-count{color:#92400e}.engine-hint{font-size:11px;color:var(--text-light)}.engine-model-badge{display:inline-flex;align-items:center;font-size:10px;font-weight:700;color:#c084fc;background:#c084fc1f;border:1px solid rgba(192,132,252,.25);border-radius:4px;padding:2px 6px;letter-spacing:.03em;text-transform:uppercase}.plan-feature-highlight{color:#c084fc!important;font-weight:600;font-size:13px}.input-wrapper{display:flex;align-items:flex-end;gap:8px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:10px 14px;transition:border-color .2s,box-shadow .2s;box-shadow:var(--shadow-sm)}.input-wrapper:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px 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