/* --- VARIABLES Y ESTILOS GLOBALES --- */
:root {
  --primary-color: #0d2c4f; /* Azul oscuro corporativo */
  --secondary-color: #1a5a9c; /* Azul medio */
  --accent-color: #007bff; /* Azul brillante para interacciones */
  --light-gray: #f8f9fa;
  --text-color: #333;
  --border-color: #dee2e6;
  --white-color: #ffffff;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  background-color: var(--light-gray);
  color: var(--text-color);
}

/* --- ENCABEZADO Y NAVEGACIÓN --- */
header {
  background-color: var(--primary-color);
  color: var(--white-color);
  padding: 1.5rem 2rem;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

header h1 {
  margin: 0;
  font-weight: 700;
}

header nav {
  margin-top: 1rem;
}

header nav button {
  margin: 0 0.5rem;
  padding: 0.6rem 1.5rem;
  border: 1px solid transparent;
  border-radius: 25px;
  background-color: var(--secondary-color);
  color: var(--white-color);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

header nav button:hover {
  background-color: var(--accent-color);
  transform: translateY(-2px);
}

header nav button.active {
  background-color: var(--accent-color);
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(0, 123, 255, 0.4);
}

/* --- CONTENEDOR PRINCIPAL Y SECCIONES --- */
main {
  padding: 1rem;
}

.form-section {
  max-width: 1000px;
  margin: 2rem auto;
  padding: 2.5rem;
  background-color: var(--white-color);
  border-radius: 12px;
  box-shadow: var(--shadow);
  display: none; /* Se gestiona con JS */
}

.form-section.active {
  display: block;
}

.form-section h2 {
  text-align: center;
  color: var(--primary-color);
  margin-top: 0;
  margin-bottom: 2rem;
  font-size: 2rem;
}

/* --- ESTILOS DE FORMULARIO --- */
form {
  display: grid;
  /* Diseño responsivo: 2 columnas en PC, 1 en móvil */
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

input[type="text"],
input[type="number"],
input[type="date"],
select {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  box-sizing: border-box;
  transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

form button[type="submit"] {
  /* Ocupa todo el ancho del grid */
  grid-column: 1 / -1;
  justify-self: center;
  width: 50%;
  max-width: 300px;
  padding: 0.9rem 1.5rem;
  border: none;
  border-radius: 8px;
  background-color: var(--primary-color);
  color: var(--white-color);
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s;
}

form button[type="submit"]:hover {
  background-color: var(--accent-color);
  transform: scale(1.03);
}

/* --- BUSCADOR Y TABLA --- */
input[id^="buscar"] {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 1.5rem;
  box-sizing: border-box;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  box-shadow: var(--shadow);
  border-radius: 8px;
  overflow: hidden; /* Para que el border-radius afecte a las celdas */
}

thead tr {
  background-color: var(--secondary-color);
  color: var(--white-color);
  font-weight: 500;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

tbody tr:nth-of-type(even) {
  background-color: var(--light-gray);
}

tbody tr:last-of-type td {
  border-bottom: none;
}

tbody tr:hover {
  background-color: #e9ecef;
}

/* --- BOTONES DE ACCIÓN EN TABLAS --- */
.action-btn {
  padding: 0.4rem 0.8rem;
  border: none;
  border-radius: 6px;
  color: white;
  cursor: pointer;
  margin-right: 5px;
  font-size: 0.9rem;
  transition: opacity 0.2s;
}

.action-btn:hover {
  opacity: 0.8;
}

.edit-btn {
  background-color: var(--success-color);
}

.delete-btn {
  background-color: var(--danger-color);
}

.hidden {
  display: none;
}

/* Media Query para responsividad en pantallas pequeñas */
@media (max-width: 768px) {
  header {
    padding: 1rem;
  }
  header nav button {
    padding: 0.5rem 1rem;
    margin: 0.2rem;
  }
  .form-section {
    padding: 1.5rem;
    margin: 1rem auto;
  }
  form button[type="submit"] {
    width: 100%;
  }
}