:root{--color-primary:#007bff;--color-secondary:#6c757d;--color-background:#f8f9fa;--color-text:#212529;--color-card-bg:#fff;--color-border:#dee2e6;--color-error:#dc3545;--font-family-sans:system-ui, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family-sans);background-color:var(--color-background);color:var(--color-text);line-height:1.5}a{color:var(--color-primary);text-decoration:none}.main-container{max-width:1200px;margin:0 auto;padding:1.5rem}