:root{--primary-color:#0070f3;--secondary-color:#6c757d;--light-color:#f8f9fa;--dark-color:#343a40;--success-color:#28a745;--danger-color:#dc3545;--font-family:"Roboto",sans-serif}*{box-sizing:border-box;margin:0;padding:0}body,html{font-family:var(--font-family);font-size:16px;line-height:1.6;color:var(--dark-color)}a{color:var(--primary-color);text-decoration:none}a:hover{text-decoration:underline}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}.btn{display:inline-block;padding:.6em 1.2em;border-radius:4px;font-weight:500;border:none;cursor:pointer;transition:all .3s ease}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-secondary{background-color:var(--secondary-color);color:#fff}.btn-primary:hover,.btn-secondary:hover{opacity:.9;text-decoration:none}.main-content{min-height:calc(100vh - 160px)}.auth-container{max-width:400px;margin:40px auto;padding:20px;background:var(--light-color);border-radius:8px;box-shadow:0 2px 10px rgba(0,0,0,.1)}.auth-container h1{margin-bottom:20px;text-align:center}