:root {
  --bg: #0f1724;
  --card: #0b1220;
  --accent: #3b82f6;
  --muted: #94a3b8;
  --glass: rgba(255, 255, 255, 0.03);
  --radius: 14px;
  font-family: Inter, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
html,
body {
  /* height: 100%; */
  margin: 0;
  background: linear-gradient(180deg, #071028 0%, #071827 60%);
  color: #e6eef8;
}
.wrap {
  max-width: 980px;
  margin: 48px auto;
  padding: 28px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.01)
  );
  border-radius: 18px;
  box-shadow: 0 8px 30px rgba(2, 6, 23, 0.7);
}
header {
  display: flex;
  gap: 18px;
  align-items: center;
}
.logo {
  width: 68px;
  height: 68px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #02203a;
  font-size: 20px;
  box-shadow: 0 6px 18px rgba(59, 130, 246, 0.18);
}
h1 {
  margin: 0;
  font-size: 20px;
}
p.lead {
  color: var(--muted);
  margin-top: 8px;
}
nav.toc {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
nav.toc a {
  padding: 8px 12px;
  background: var(--glass);
  border-radius: 10px;
  text-decoration: none;
  color: var(--muted);
  font-size: 13px;
}

nav.toc a:hover{
    background: var(--accent);
    color: #021226;
}
main {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.card {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.015),
    rgba(255, 255, 255, 0.01)
  );
  padding: 18px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.03);
}
h2 {
  margin: 0 0 8px 0;
}
ul.short {
  margin: 8px 0 0 18px;
  color: var(--muted);
}
.meta {
  font-size: 13px;
  color: var(--muted);
  margin-top: 6px;
}
footer {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  background: linear-gradient(90deg, var(--accent), #06b6d4);
  color: #021226;
  border: 0;
  box-shadow: 0 10px 30px rgba(59, 130, 246, 0.14);
}
.note {
  font-size: 13px;
  color: var(--muted);
}
@media (max-width: 640px) {
  .wrap {
    margin: 18px;
    padding: 16px;
  }
  .logo {
    width: 56px;
    height: 56px;
    font-size: 18px;
  }
}