:root{--color-primary:#007bff;--color-primary-dark:#0056b3;--color-primary-light:#e6f2ff;--color-success:#28a745;--color-danger:#dc3545;--color-warning:#ffc107;--color-text:#111;--color-text-muted:#666;--color-bg:#fafafa;--color-bg-white:#ffffff;--color-border:#ddd;--color-border-light:#eee;--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--radius-sm:4px;--radius-md:6px;--radius-lg:8px;--radius-full:9999px;--font-family:system-ui,-apple-system,"Segoe UI",sans-serif;--font-size-sm:0.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.5rem;--font-size-2xl:2rem;--shadow-sm:0 1px 2px rgba(0,0,0,0.05);--shadow-md:0 2px 4px rgba(0,0,0,0.1);--shadow-lg:0 4px 8px rgba(0,0,0,0.1)}*,:after,:before{box-sizing:border-box}body{font-family:var(--font-family);font-size:var(--font-size-base);line-height:1.6;margin:0;background:var(--color-bg);color:var(--color-text)}h1,h2,h3,h4,h5,h6{line-height:1.2;margin-top:0;font-weight:600}h1{font-size:var(--font-size-2xl)}h2{font-size:var(--font-size-xl)}h3{font-size:var(--font-size-lg)}button{cursor:pointer;padding:var(--spacing-sm) var(--spacing-lg);border:none;border-radius:var(--radius-md);background:var(--color-primary);color:white;font-size:var(--font-size-base);font-family:inherit;font-weight:500;transition:background-color .2s,opacity .2s}button:hover:not(:disabled){background:var(--color-primary-dark)}button:disabled{opacity:.5;cursor:not-allowed}input[type=email],input[type=password],input[type=text],input[type=url]{padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--font-size-base);font-family:inherit;width:100%;transition:border-color .2s}input:focus{outline:none;border-color:var(--color-primary)}a{color:var(--color-primary);text-decoration:none;transition:color .2s}a:hover{color:var(--color-primary-dark);text-decoration:underline}