* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

a {
  color: inherit;
}

.container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #0007c2;
  color: #fff;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

nav a {
  color: #fff;
  text-decoration: none;
  margin-left: 12px;
  padding: 8px 10px;
  border-radius: 8px;
  display: inline-block;
}

nav a:hover {
  background: rgba(255, 255, 255, 0.12);
}

main {
  padding: 20px 16px;
}

.section {
  display: none;
}

.section.active {
  display: block;
}

.card {
  background: #f3f4f6;
  padding: 16px;
  border-radius: 12px;
}

.card2 {
  background: #e9e9e9;
  padding: 16px;
  border-radius: 12px;
  border: 2px solid #777;
}

footer {
  padding: 20px 16px;
  color: #6b7280;
}

.top-title {
  background:#0007c2;
  color:#fff;
  text-align:center;
  padding:14px 16px;
  font-weight:700;
  letter-spacing:.5px;
  font-size: 30px;
}

a.link {
  color: black;
  text-decoration: none;
}