*{box-sizing:border-box}body{margin:0;background:#f7f9fb;color:#263342;font:17px/1.7 system-ui,sans-serif}header,main,footer{max-width:1100px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #dfe6ec}header>a{font-size:22px;font-weight:700}nav{display:flex;gap:20px}a{color:#236e92;text-decoration:none}a:hover{text-decoration:underline}a:focus-visible{outline:3px solid #236e92;outline-offset:4px}h1{font-size:30px;line-height:1.4}h2{font-size:23px;margin-top:32px}p{color:#526477}section{padding-bottom:16px}.cards,.districts{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px}.cards a{display:block;background:#fff;border:1px solid #dae5ed;border-radius:10px;padding:14px;text-align:center}.districts li{padding:8px 12px;background:#edf3f7;border-radius:6px}footer{border-top:1px solid #dfe6ec;font-size:15px}@media(max-width:520px){header{align-items:flex-start;gap:16px;flex-direction:column}header,main,footer{padding:20px}h1{font-size:26px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}