:root{--primary-blue: #1976d2;--light-blue: #e3f2fd;--white: #ffffff;--error-red: #f44336;--light-gray: #f5f5f5;--text-black: #000000;--text-gray: #666666}html,body{height:100%;margin:0;font-family:Roboto,Helvetica Neue,sans-serif}*{box-sizing:border-box}.btn{padding:8px 16px;border:1px solid transparent;border-radius:4px;cursor:pointer;font-size:14px}.btn-primary{background-color:var(--primary-blue);color:var(--white);border-color:var(--primary-blue)}.btn-primary:hover{opacity:.9}.btn-secondary{background-color:var(--white);color:var(--primary-blue);border-color:var(--primary-blue)}.btn-secondary:hover{background-color:var(--light-blue)}.card{background:var(--white);border:1px solid #e0e0e0;border-radius:4px;padding:16px}.card-header{border-bottom:1px solid #e0e0e0;padding-bottom:16px;margin-bottom:16px}.card-title{margin:0;font-size:1.25rem;font-weight:500}