/* === Reset === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* === Fuente y fondo === */
body {
  font-family: "Poppins", "Segoe UI", Arial, sans-serif;
  background: #f4f6f7;
  color: #2b2b2b;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  align-items: center;
}

/* === Header === */
header {
  background: #0d3b66; /* azul petróleo */
  color: white;
  text-align: center;
  padding: 20px 0;
  width: 100%;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

header h1 {
  font-size: 1.8em;
  font-weight: 600;
  margin-bottom: 6px;
}

header nav a {
  color: #d1f5e1; /* verde menta claro */
  text-decoration: none;
  margin: 0 12px;
  font-weight: 500;
}

/* === Contenido principal === */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 50px 20px;
  text-align: center;
  width: 100%;
}

main h1 {
  color: #0d3b66;
  font-size: 1.8em;
  margin-bottom: 35px;
  font-weight: 600;
}

/* === Grid === */
.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
  width: 85%;
  max-width: 900px;
}

/* === Tarjetas === */
.link-list {
  background: #ffffff;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.08);
  text-align: center;
  border-top: 4px solid #0d3b66;
}

.link-list h2 {
  color: #155e63; /* verde petróleo */
  font-size: 1.2em;
  font-weight: 600;
  border-bottom: 2px solid #a7c957;
  padding-bottom: 8px;
  margin-bottom: 15px;
}

.link-list a {
  display: block;
  color: #1e293b;
  text-decoration: none;
  font-size: 16px;
  margin: 10px 0;
}

/* === Footer === */
footer {
  background: #155e63; /* verde oscuro */
  color: white;
  text-align: center;
  padding: 15px 0;
  font-size: 14px;
  width: 100%;
  margin-top: auto;
  box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.1);
}