:root {
  --color-rojo: #B01621;
  --color-gris: #333333;
  --color-fondo: #f5f5f5;
  --color-blanco: #ffffff;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--color-fondo);
  color: var(--color-gris);
}

header.app-header {
  background: var(--color-blanco);
  border-bottom: 3px solid var(--color-rojo);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

header.app-header .brand {
  display: flex;
  align-items: center;
  gap: 20px;
}

header.app-header img {
  height: 55px;
}

nav.app-nav a {
  color: var(--color-gris);
  text-decoration: none;
  margin-right: 16px;
  font-weight: bold;
}

nav.app-nav a:hover {
  color: var(--color-rojo);
}

.periodo-activo {
  background: var(--color-rojo);
  color: #fff;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.9em;
}

.container {
  max-width: 1000px;
  margin: 20px auto;
  padding: 0 20px;
}

.card {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  margin-bottom: 16px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card h3 {
  margin-top: 0;
  color: var(--color-rojo);
}

.login-box {
  max-width: 340px;
  margin: 80px auto;
  background: #fff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.15);
  text-align: center;
}

.login-box img {
  height: 80px;
  margin-bottom: 20px;
}

.app-titulo {
  font-size: 1.8em;
  font-weight: bold;
  letter-spacing: 0.5px;
  color: var(--color-gris);
  margin: 0 0 20px;
  text-align: center;
}

.login-box input {
  width: 100%;
  padding: 8px;
  margin: 8px 0;
  box-sizing: border-box;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.login-box button {
  width: 100%;
  padding: 10px;
  background: var(--color-rojo);
  color: #fff;
  border: none;
  border-radius: 4px;
  font-weight: bold;
  cursor: pointer;
}

.login-box button:hover {
  background: #8f1119;
}

.error {
  color: var(--color-rojo);
  font-size: 0.9em;
}

.stub {
  text-align: center;
  padding: 60px 20px;
  color: #888;
}

.aviso-demo {
  color: #888;
  font-style: italic;
}

table.tabla-datos {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

table.tabla-datos th,
table.tabla-datos td {
  padding: 8px;
  border-bottom: 1px solid #eee;
  text-align: left;
}