:root,[data-theme=dark]{--bg: #0f172a;--bg-card: #1e293b;--bg-input: #0f172a;--bg-hover: #334155;--border: #334155;--text: #e2e8f0;--text-muted: #64748b;--text-secondary: #94a3b8;--accent: #3b82f6;--accent-hover: #60a5fa;--user-bubble: #1d4ed8;--user-text: #eff6ff;--assistant-bubble: #1e293b;--assistant-text: #e2e8f0;--error-color: #ef4444;--success-color: #10b981;--radius: 12px;--radius-sm: 6px;--shadow: 0 4px 24px rgba(0,0,0,.4);--quota-warn-bg: #3d2500;--quota-warn-text: #fde68a;--quota-warn-border: #78350f;--quota-alert-bg: #411a00;--quota-alert-text: #fed7aa;--quota-alert-border: #7c2d12;--quota-danger-bg: #7f1d1d;--quota-danger-text: #fecaca;--quota-danger-border: #991b1b}[data-theme=light]{--bg: #f3f4f6;--bg-card: #ffffff;--bg-input: #eceef1;--bg-hover: #e5e7eb;--border: #d8dce2;--text: #1e2630;--text-muted: #9aa3b0;--text-secondary: #525c6b;--accent: #2c6ecb;--accent-hover: #245aa8;--user-bubble: #2c6ecb;--user-text: #ffffff;--assistant-bubble: #eef1f4;--assistant-text: 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