:root {
  --container: 600px;
  --color-primary: #022f5B;
  --color-secondary: #E0EFFF;
  --color-accent: #0056b3;
  --color-text: #212529;
  --color-bg: #F8F9FA;
  --color-card: #FFFFFF;
  --color-footer-bg: #343A40;
  --color-footer-text: #E9ECEF;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background-color: var(--color-bg);
  font-family: 'Inter', sans-serif;
  text-align: left;
  color: var(--color-text);
}

.pagina {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1rem;
  min-height: 100vh;
  box-sizing: border-box;
}

header {
  text-align: center;
}

h1 {
  display: inline-block;
  padding: 1rem 2rem;
  border-radius: 12px 0 12px 0;
  background: var(--color-secondary);
  color: var(--color-primary);
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
  box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
  border: 2px solid transparent;
  margin-top: 1rem;
}

h1:hover {
  background: var(--color-secondary);
  transform: translateY(-4px);
  box-shadow: 4px 4px 12px rgba(0,0,0,0.15);
}

.perfil__subtitulo {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text);
  margin: 0.5rem 0 1.5rem 0;
  text-align: center;
}

img.perfil__foto {
  display: block;
  margin: 30px auto 30px auto;
  max-width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 4px solid var(--color-primary);
  box-shadow: 4px 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.4s ease;
  object-fit: cover;
}

img.perfil__foto:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px var(--color-secondary);
}

.menu-principal {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
  padding: 0;
  list-style: none;
}

.menu-principal a {
  display: inline-block;
  padding: 0.7rem 1.3rem;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: 8px;
  text-decoration: none;
  box-shadow: 2px 2px 8px rgba(0,0,0,.15);
  transition: all .25s ease;
}

.menu-principal a:hover,
.menu-principal a:focus {
  background: var(--color-primary);
  transform: translateY(-2px);
}

.links-estudiantes {
  max-width:var(--container);
  margin: 2rem auto 1rem auto;
  text-align: center;
}

.links-estudiantes h2 {
  font-size: 1.4rem;
  color: var(--color-text);
  margin-bottom: 1rem;
  font-weight: 700;
}

.estudiantes {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.estudiantes li a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: var(--color-secondary);
  color: var(--color-primary);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  box-shadow: 2px 2px 6px rgba(0,0,0,0.1);
  transition: background-color 0.3s ease, color 0.3s ease;
  font-size: 0.9rem;
}

.estudiantes li a.activo {
  background-color: var(--color-primary);
  color: #fff;
  cursor: default;
}

.estudiantes li a:not(.activo):hover {
  background-color: var(--color-primary);
  color: #fff;
}

.materias {
  max-width: var(--container);
  margin: 3rem auto;
  padding: 0 1rem;
}

.materias h2{
  color: var(--color-text);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  border-bottom: 3px solid var(--color-primary);
  padding-bottom: 0.5rem;
  text-align: left;
}

.cards-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.card {
  background-color: var(--color-card);
  border: 1px solid #DEE2E6;
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
  text-align: left;
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 6px 12px rgba(0,0,0,0.1);
  transform: translateY(-5px);
  border-color: var(--color-accent);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  border-bottom: 1px solid #eee;
  padding-bottom: 0.5rem;
}

.card ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--color-text);
  column-count: 2;
  column-gap: 20px;
}

.card.en-curso ul {
    column-count: 1;
}

.card ul li {
  margin-bottom: 0.25rem;
}

.card ul li:before {
  content: "•";
  color: var(--color-accent);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

.tema-elegido-box {
  margin-top: 2rem; 
  border: 1px dashed var(--color-primary); 
  padding: 1.5rem; 
  border-radius: 8px;
  background-color: #fcfdff;
  text-align: left;
}

.info-uni {
  max-width: var(--container);
  margin: 3rem auto;
  padding: 0 1rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text);
  text-align: left;
}

.info-uni h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  border-bottom: 3px solid var(--color-primary);
  padding-bottom: 0.5rem;
}

.info-uni p {
  margin: 0.5rem 0;
}

.info-uni strong {
  color: var(--color-primary);
  font-weight: 700;
}

footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  font-size: 0.85rem;
  text-align: center;
  padding: 1.5rem;
  max-width: var(--container);
  margin: 2rem auto;
  border-radius: 10px;
  line-height: 1.6;
}

footer p {
    margin: 0.5rem 0;
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.5rem;
    padding: 0.75rem 1rem;
  }
  img.perfil__foto {
    max-width: 150px;
    height: 150px;
  }
  .menu-principal {
    flex-direction: column;
    align-items: center;
  }
  
  .card ul {
    column-count: 1;
  }

  .estudiantes {
      flex-direction: column;
      align-items: center;
  }
}