:root {
  --color-fondo: #f9f5f0;
  --color-primario: #5d4037;
  --color-secundario: #8d6e63;
  --color-pagado: #4caf50;
  --color-pendiente: #f44336;
}

body {
  font-family: 'Roboto', sans-serif;
  background-color: var(--color-fondo);
  color: #333;
  margin: 0;
  padding: 0;
}

header {
  background-color: var(--color-primario);
  color: white;
  padding: 1rem;
  text-align: center;
  font-size: 1.5rem;
}

nav {
  background-color: var(--color-secundario);
  padding: 0.8rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

nav a {
  color: white;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: background 0.3s;
}

nav a:hover {
  background-color: rgba(255,255,255,0.2);
}

.container {
  max-width: 1200px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

.section-title {
  color: var(--color-primario);
  margin: 1.5rem 0 1rem;
  font-size: 1.4rem;
  border-bottom: 2px solid var(--color-secundario);
  padding-bottom: 0.3rem;
}

.btn {
  display: inline-block;
  background-color: var(--color-primario);
  color: white;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  font-weight: bold;
  margin: 0.3rem;
}

.btn:hover {
  opacity: 0.9;
}

.btn-pagado {
  background-color: var(--color-pendiente);
}

.btn-pagado.pagado {
  background-color: var(--color-pagado);
  pointer-events: none;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.3rem;
  font-weight: bold;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

.table-container {
  overflow-x: auto;
  margin-top: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

th, td {
  padding: 0.8rem;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: var(--color-secundario);
  color: white;
}

.search-bar {
  margin: 1rem 0;
  display: flex;
  gap: 0.5rem;
}

.search-bar input {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}

@media (max-width: 600px) {
  nav {
    flex-direction: column;
    align-items: center;
  }

  .search-bar {
    flex-direction: column;
  }
}