:root{--color-primary: #1a1a1a;--color-secondary: #666;--color-accent: #2a5d3c;--color-background: #f5f5f5;--color-surface: #fff;--color-border: #e0e0e0;--color-error: #c00;--color-success: #2e7d32;--font-body: "Open Sans", -apple-system, BlinkMacSystemFont, sans-serif;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--border-radius: 4px}*,*:before,*:after{box-sizing:border-box}html{font-size:16px}body{margin:0;font-family:var(--font-body);font-size:1rem;line-height:1.5;color:var(--color-primary);background:var(--color-background)}h1,h2,h3{margin:0 0 var(--spacing-md)}a{color:var(--color-accent);text-decoration:none}button{font-family:var(--font-body);cursor:pointer}.btn{padding:.75rem 1.5rem;border-radius:var(--border-radius);font-size:1rem;font-weight:600;border:none;min-height:44px}.btn-primary{background:var(--color-accent);color:#fff}.btn-primary:hover:not(:disabled){background:#1e4a2e}.btn-primary:disabled{background:#ccc;cursor:not-allowed}.btn-danger{background:var(--color-error);color:#fff}.btn-danger:hover{background:#a00}