*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#f5f7fa;color:#1d2732;line-height:1.72}
header{background:#123b63;color:#fff}.wrap{max-width:1080px;margin:auto;padding:0 20px}.top{padding:24px 0}.brand{font-size:28px;font-weight:800}
nav{display:flex;flex-wrap:wrap;gap:14px;margin-top:12px}nav a{color:#fff;text-decoration:none;font-weight:700}
.hero{background:#fff;border-bottom:1px solid #dbe4ec;padding:34px 0}h1{font-size:38px;line-height:1.18;margin:0 0 14px}
h2{font-size:29px}h3{font-size:25px}h4{font-size:22px}h5{font-size:19px}h2,h3,h4,h5{line-height:1.3;margin:30px 0 10px}
main{padding:26px 0}.card{background:#fff;border:1px solid #dbe4ec;border-radius:14px;padding:28px;margin-bottom:22px}
.links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px 24px}.links a,.related a{display:block;color:#0f5f9d;text-decoration:none;padding:5px 0}
.topic-photo{width:100%;max-width:980px;height:auto;max-height:520px;object-fit:cover;border-radius:14px;display:block;margin:22px auto 0;box-shadow:0 4px 16px rgba(0,0,0,.08)}
footer{background:#17212b;color:#e7edf3;padding:30px 0;margin-top:30px}footer a{color:#fff}@media(max-width:760px){h1{font-size:31px}.links{grid-template-columns:1fr}}

.topic-photo-wrap{margin:20px auto 8px;max-width:900px}
.topic-photo{display:block;width:100%;height:auto;max-height:520px;object-fit:cover;border-radius:14px}
.photo-credit{margin-top:5px;font-size:11px;color:#68758a;text-align:right}
.photo-credit a{color:#4a6680}
.external-source-box{margin:28px 0 8px;padding:16px 18px;background:#eef5fb;border-left:4px solid #123b63;border-radius:8px}
.external-source-box strong{display:block;margin-bottom:5px}
.external-source-box a{color:#0f5f9d;font-weight:700}