:root,[data-theme=dark]{--bg: #0f172a;--widget-bg: #1e293b;--text: #f8fafc;--text-muted: #94a3b8;--accent: #3b82f6;--error: #ef4444;--header-border: rgba(255, 255, 255, .08)}[data-theme=light]{--bg: #f1f5f9;--widget-bg: #ffffff;--text: #0f172a;--text-muted: #64748b;--accent: #2563eb;--error: #dc2626;--header-border: rgba(0, 0, 0, .08)}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;transition:background-color .2s ease,color .2s ease}a{color:var(--accent)}