* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 24px; font: 17px/1.6 system-ui,sans-serif; background: #07131e; color: #fff; }
.card { max-width: 520px; padding: 32px; border: 1px solid #ffc107; border-radius: 18px; background: linear-gradient(135deg,#193a52,#0b1320); box-shadow: 0 12px 48px #0008; text-align: center; }
h1 { margin: 12px 0; font-size: 36px; }
.coin { display: inline-block; border: 2px solid #ffc107; color: #fff3b0; padding: 14px; border-radius: 50%; font-weight: 900; }
nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
a { color: #07131e; background: #00c896; padding: 12px 20px; border-radius: 8px; font-weight: 700; text-decoration: none; }
a:focus-visible { outline: 3px solid white; outline-offset: 3px; }
[hidden] { display: none !important; }