body{font-family:system-ui,sans-serif;margin:0;color:#14213d;background:#f7f8fc;line-height:1.55}main,header{max-width:860px;margin:auto;padding:36px 24px}nav a{margin-right:16px;color:#3a5bff;text-decoration:none}h1{font-size:40px;margin:8px 0}.card{background:#fff;padding:22px;border-radius:12px;box-shadow:0 2px 8px #0001;margin:16px 0}.btn{display:inline-block;background:#3a5bff;color:#fff;padding:12px 20px;border-radius:10px;text-decoration:none;font-weight:600}footer{text-align:center;color:#777;padding:24px;font-size:13px}