:root {--sec-blue:#075778;--sec-dark:#10364c;--sec-light:#edf6fb}
body {background:#f7fbfe;color:#15364a;font-family:system-ui,-apple-system,sans-serif}
.navbar {background:var(--sec-dark)!important;box-shadow:0 2px 12px #1233}
.jumbotron {background:var(--sec-light);color:var(--sec-dark);border-bottom:3px solid #167ba2}
.btn-primary,.challenge-button {background:var(--sec-blue);border-color:var(--sec-blue);border-radius:9px}
.btn-primary:hover,.challenge-button:hover {background:#06405b;border-color:#06405b}
.challenge-button {min-height:92px;white-space:normal;box-shadow:0 3px 9px #1232}
.sec-hero {display:flex;align-items:center;gap:36px;padding:40px 24px;background:white;border:1px solid #d3e6f1;border-radius:20px;margin:32px 0}
.sec-mark {width:210px;height:160px;overflow:hidden;flex-shrink:0;border-radius:16px;background:white}
.sec-mark img {width:270px;max-width:none;transform:translate(-30px,-58px)}
.sec-hero h1 {font-weight:800;color:var(--sec-dark);font-size:2.7rem}
.sec-kicker {color:#167ba2;font-weight:700;letter-spacing:.12em;text-transform:uppercase}
.sec-cards {display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:26px 0}
.sec-card {padding:24px;background:white;border:1px solid #d3e6f1;border-radius:14px}
a {color:#086d98} a:focus-visible,button:focus-visible {outline:3px solid #f2ad32;outline-offset:3px}
@media(max-width:700px){.sec-hero{flex-direction:column;gap:12px;padding:22px}.sec-hero h1{font-size:2rem}.sec-cards{grid-template-columns:1fr}}