/* Estilos principais para o sistema de faturas */
:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --light-color: #ecf0f1;
  --dark-color: #34495e;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  --border-radius: 5px;
  --box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f5f7fa;
  color: #333;
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* Cabeçalho */
.header {
  background-color: var(--primary-color);
  color: white;
  padding: 15px 0;
  box-shadow: var(--box-shadow);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 40px;
  margin-right: 10px;
}

.logo h1 {
  font-size: 1.5rem;
}

/* Menu de navegação */
.nav {
  background-color: var(--dark-color);
  padding: 10px 0;
}

.nav ul {
  display: flex;
  list-style: none;
  justify-content: center;
}

.nav ul li {
  margin: 0 15px;
}

.nav ul li a {
  color: white;
  text-decoration: none;
  padding: 8px 15px;
  border-radius: var(--border-radius);
  transition: background-color 0.3s;
}

.nav ul li a:hover,
.nav ul li a.active {
  background-color: var(--secondary-color);
}

/* Cards */
.card {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 20px;
  margin-bottom: 20px;
}

.card-header {
  border-bottom: 1px solid #eee;
  padding-bottom: 15px;
  margin-bottom: 15px;
}

.card-header h2 {
  color: var(--primary-color);
}

/* Botões */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  text-decoration: none;
  font-size: 1rem;
  margin: 5px;
  transition: background-color 0.3s;
}

.btn-primary {
  background-color: var(--secondary-color);
  color: white;
}

.btn-primary:hover {
  background-color: #2980b9;
}

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

.btn-success:hover {
  background-color: #219653;
}

.btn-warning {
  background-color: var(--warning-color);
  color: white;
}

.btn-warning:hover {
  background-color: #e67e22;
}

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

.btn-danger:hover {
  background-color: #c0392b;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.875rem;
}

/* Formulários */
.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

.form-control {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-size: 1rem;
}

/* Tabelas */
.table {
  width: 100%;
  border-collapse: collapse;
  margin: 15px 0;
}

.table th,
.table td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

.table th {
  background-color: var(--light-color);
  font-weight: bold;
}

.table tr:hover {
  background-color: #f5f5f5;
}

/* Alertas */
.alert {
  padding: 15px;
  border-radius: var(--border-radius);
  margin-bottom: 20px;
}

.alert-success {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert-danger {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* Responsividade */
@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
  
  .header-content {
    flex-direction: column;
    text-align: center;
  }
  
  .nav ul {
    flex-direction: column;
    align-items: center;
  }
  
  .nav ul li {
    margin: 5px 0;
  }
  
  .card {
    padding: 15px;
  }
  
  .btn {
    display: block;
    width: 100%;
    margin: 10px 0;
    text-align: center;
  }
  
  .table {
    display: block;
    overflow-x: auto;
  }
}