/* === Reseteo Base === */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: #e6f0ff;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === Estructura envolvente === */
.contenedor-principal {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === Header === */
header {
  background-color: #003366;
  color: white;
  padding: 10px 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0px; /* Ajusta según lo que visualmente te funcione */
}

header img {
  height: 40px;
}

header button {
  background-color: #cc0000;
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 6px;
  cursor: pointer;
}

/* === Main === */
main {
  flex: 1;
  padding: 0 30px 120px;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

/* === Título === */
h1 {
  color: #003366;
  text-align: center;
  font-size: 2em;
  margin-bottom: 10px;
}

/* === Saludo === */
.saludo {
  background-color: #336699;
  color: white;
  padding: 20px;
  border-radius: 8px;
  width: 100%;
  max-width: 500px;
  text-align: center;
}

/* === Navegación === */
nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
}

nav button {
  background-color: #0059b3;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

nav button:hover {
  background-color: #004080;
}

/* === Avatar Card === */
.avatar-card {
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 8px rgba(0,0,0,0.1);
  text-align: center;
  max-width: 500px;
  width: 100%;
}

.avatar-card img {
  max-width: 100%;
  height: auto;
  margin-bottom: 10px;
}

.avatar-card h3 {
  margin: 10px 0 5px;
  color: #003366;
}

/* === Footer === */
footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50px;
  background-color: #003366;
  color: white;
  text-align: center;
  padding: 12px 20px;
  font-size: 0.9em;
  z-index: 10;
}

/* === Estilo para tarjeta horizontal === */
.tarjeta-horizontal {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: white;
  padding: 20px 30px;
  border-radius: 8px;
  box-shadow: 0 0 8px rgba(0,0,0,0.1);
  max-width: 800px;
  width: 100%;
}

.tarjeta-horizontal img.avatar {
  width: 300px;
  height: auto;
  border-radius: 0;
}

/* === Estilo para saludo del profesor === */
.saludo-profesor {
  flex: 1;
}

.saludo-profesor h3 {
  margin: 0 0 5px;
  color: #003366;
}

.saludo-profesor p {
  margin: 0;
  color: #333;
}

.panel-mensaje {
  margin-top: 20px;
  padding: 12px;
  border-radius: 6px;
  font-weight: bold;
  font-family: 'Segoe UI', sans-serif;
  transition: all 0.3s ease-in-out;
  border: 1px solid transparent;
  background-color: #fbeaea;
  color: #b22222;
  text-align: center;
}

.panel-mensaje.exito {
  background-color: #e6f8e6;
  color: #2e7d32;
  border-color: #2e7d32;
}

.panel-mensaje.alerta {
  background-color: #fff8e1;
  color: #8a6d3b;
  border-color: #8a6d3b;
}

.oculto {
  display: none !important;
}