:root{--primary-color: #3b82f6;--secondary-color: #8b5cf6;--success-color: #10b981;--warning-color: #f59e0b;--danger-color: #ef4444;--bg-color: #f9fafb;--card-bg: #ffffff;--text-primary: #111827;--text-secondary: #6b7280;--border-color: #e5e7eb}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-primary);line-height:1.6}h1,h2,h3,h4,h5,h6{margin-bottom:.5rem;font-weight:600}button{cursor:pointer;border:none;padding:.5rem 1rem;border-radius:.375rem;font-size:.875rem;font-weight:500;transition:all .2s}button:hover{opacity:.9}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-secondary{background-color:var(--secondary-color);color:#fff}.card{background-color:var(--card-bg);border-radius:.5rem;padding:1rem;box-shadow:0 1px 3px #0000001a;border:1px solid var(--border-color)}