*{box-sizing:border-box;margin:0;padding:0}body,.light-theme{--primary-color: #0d6efd;--success-color: #198754;--background-color: #f8f9fa;--surface-color: #ffffff;--text-color: #212529;--text-light: #6c757d;--border-color: #dee2e6;background-color:var(--background-color);color:var(--text-color);transition:background-color .3s,color .3s}.dark-theme{--primary-color: #0d6efd;--success-color: #20c997;--background-color: #121212;--surface-color: #1e1e1e;--text-color: #e9ecef;--text-light: #adb5bd;--border-color: #343a40}:root{--primary-color: #0d6efd;--success-color: #198754;--background-color: #f8f9fa;--surface-color: #ffffff;--text-color: #212529;--text-light: #6c757d;--border-color: #dee2e6}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--background-color);color:var(--text-color);line-height:1.6;padding-bottom:5rem}.container{max-width:960px;margin:2rem auto;padding:1.5rem}h1,h2,h3{margin-bottom:1rem;font-weight:600}button{cursor:pointer;border:1px solid transparent;padding:.5rem 1rem;border-radius:.25rem;font-size:1rem;font-weight:500;transition:all .2s ease-in-out}@media (max-width: 768px){.container{margin:1rem auto;padding:1rem}}