* { box-sizing: border-box; }

:root{
  --bg1:#0b2a4a;
  --bg2:#0f766e;
  --text:#0f172a;
  --muted:#475569;
  --card:#ffffff;
  --border:rgba(15,23,42,.12);
  --shadow:0 18px 60px rgba(2,6,23,.22);
  --btn:#0b57d0;
  --btnh:#0a4fbf;
}

body{
  margin:0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color:var(--text);
  background: linear-gradient(135deg, var(--bg1), var(--bg2));
  min-height:100vh;
}

.wrap{
  min-height:100vh;
  display:grid;
  place-items:center;
  padding:28px;
}

.card{
  width:min(880px, 100%);
  background:var(--card);
  border:1px solid var(--border);
  border-radius:16px;
  box-shadow:var(--shadow);
  overflow:hidden;
}

.card__header{
  display:flex;
  gap:16px;
  align-items:flex-start;
  padding:24px 26px 18px;
  background: rgba(15,118,110,.06);
  border-bottom:1px solid var(--border);
}

.mark{
  width:42px;
  height:42px;
  border-radius:12px;
  display:grid;
  place-items:center;
  font-weight:800;
  color:#083b8c;
  background: rgba(11,87,208,.12);
  border:1px solid rgba(11,87,208,.22);
  flex:0 0 auto;
}

h1{
  margin:0 0 6px;
  font-size:22px;
  line-height:1.2;
  letter-spacing:.2px;
}

.lead{
  margin:0;
  color:var(--muted);
  font-size:15px;
  line-height:1.45;
}

.card__body{
  padding:18px 26px 26px;
}

p{
  margin:0 0 14px;
  line-height:1.6;
  font-size:16px;
}

.actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  align-items:center;
  margin-top:12px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 16px;
  border-radius:12px;
  text-decoration:none;
  font-weight:700;
  color:#fff;
  background:var(--btn);
  border:1px solid rgba(0,0,0,.06);
}

.btn:hover{
  background:var(--btnh);
}

.btn:focus-visible{
  outline:3px solid rgba(11,87,208,.35);
  outline-offset:3px;
}

.copybox{
  padding:12px 14px;
  border-radius:12px;
  border:1px dashed rgba(15,23,42,.25);
  background: rgba(15,23,42,.03);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;
  font-size:14px;
  word-break:break-all;
}

.card__footer{
  padding:12px 26px;
  font-size:12px;
  color:#64748b;
  border-top:1px solid var(--border);
  background:#fbfdff;
}

@media (max-width:520px){
  .card__header, .card__body, .card__footer{
    padding-left:18px;
    padding-right:18px;
  }
  h1{ font-size:20px; }
  p{ font-size:15.5px; }
}