/* Reset y estilos base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: #333;
  line-height: 1.6;
}

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

/* Header */
.header {
  background: white;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 20px 0;
  margin-bottom: 30px;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: #667eea;
}

.nav {
  display: flex;
  gap: 20px;
}

.nav a {
  color: #333;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 4px;
  transition: background 0.3s;
}

.nav a:hover {
  background: #f0f0f0;
}

/* Cards */
.card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  padding: 30px;
  margin-bottom: 20px;
}

.card-title {
  font-size: 24px;
  margin-bottom: 20px;
  color: #667eea;
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: #555;
}

.form-input {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
  transition: border-color 0.3s;
}

.form-input:focus {
  outline: none;
  border-color: #667eea;
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background: #667eea;
  color: white;
}

.btn-primary:hover {
  background: #5568d3;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
  background: #6c757d;
  color: white;
}

.btn-secondary:hover {
  background: #5a6268;
}

.btn-success {
  background: #28a745;
  color: white;
}

.btn-success:hover {
  background: #218838;
}

.btn-block {
  width: 100%;
}

/* Alerts */
.alert {
  padding: 15px;
  border-radius: 4px;
  margin-bottom: 20px;
}

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

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

.alert-info {
  background: #d1ecf1;
  color: #0c5460;
  border: 1px solid #bee5eb;
}

/* Login page */
.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.login-card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  padding: 40px;
  width: 100%;
  max-width: 400px;
}

.login-logo {
  text-align: center;
  margin-bottom: 30px;
}

.login-logo h1 {
  color: #667eea;
  font-size: 28px;
}

/* Products grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.product-card {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  padding: 20px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.product-name {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  color: #333;
}

.product-price {
  font-size: 24px;
  color: #667eea;
  font-weight: bold;
  margin-bottom: 15px;
}

.product-quantity {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
}

.product-quantity input {
  width: 80px;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
  text-align: center;
}

/* Table */
.table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 8px;
  overflow: hidden;
}

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

.table th {
  background: #667eea;
  color: white;
  font-weight: 600;
}

.table tr:hover {
  background: #f8f9fa;
}

/* Footer */
.footer {
  background: white;
  padding: 30px 0;
  margin-top: 50px;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  text-align: center;
}

.footer-title {
  font-size: 20px;
  font-weight: bold;
  color: #667eea;
  margin-bottom: 15px;
}

.footer-info {
  color: #666;
  line-height: 1.8;
}

/* Responsive */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 15px;
  }

  .nav {
    flex-direction: column;
    width: 100%;
  }

  .nav a {
    text-align: center;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }
}

/* Loading spinner */
.spinner {
  border: 3px solid #f3f3f3;
  border-top: 3px solid #667eea;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}