:root {
  --primary-color: #6a11cb;
  --secondary-color: #2575fc;
  --dark-color: #2c3e50;
  --light-color: #ecf0f1;
  --success-color: #2ecc71;
  --warning-color: #e74c3c;
  --info-color: #3498db;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  margin: 0;
  padding: 20px;
  min-height: 100vh;
  color: var(--dark-color);
}

h1 {
  text-align: center;
  color: var(--primary-color);
  margin-bottom: 30px;
  font-size: 2.5rem;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.box {
  background: white;
  border-radius: 10px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.box:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.box-header {
  background: linear-gradient(
    to right,
    var(--primary-color),
    var(--secondary-color)
  );
  color: white;
  padding: 12px 20px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.box-content {
  display: flex;
  min-height: 300px;
}

.counters-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-right: 1px dashed #ddd;
}

.counter-example {
  flex: 1;
  padding: 15px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid #eee;
}

.counter-example:last-child {
  border-bottom: none;
}

.counter-example h3 {
  margin: 0 0 10px 0;
  font-size: 0.9rem;
  color: var(--secondary-color);
}

.code-section {
  flex: 1;
  padding: 0;
  background-color: #f8f9fa;
  font-family: "Courier New", Courier, monospace;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.description {
  padding: 15px;
  background-color: var(--light-color);
  border-bottom: 1px solid #ddd;
  font-size: 0.85rem;
  line-height: 1.5;
}

.description h4 {
  margin: 0 0 8px 0;
  color: var(--primary-color);
  font-size: 0.9rem;
}

.code-block {
  flex: 1;
  padding: 15px;
  overflow: auto;
}

.counter {
  font-size: 2rem;
  font-weight: bold;
  margin: 10px 0;
  color: var(--dark-color);
}

.btn {
  padding: 8px 15px;
  margin: 0 5px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
  font-size: 0.8rem;
  transition: all 0.2s;
}

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

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

.btn:disabled {
  background-color: #bdc3c7;
  cursor: not-allowed;
  opacity: 0.6;
}

.btn:hover:not(:disabled) {
  opacity: 0.9;
  transform: translateY(-2px);
}

.btn:active:not(:disabled) {
  transform: translateY(0);
}

pre {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.5;
  font-size: 0.85rem;
}

.code-label {
  display: block;
  margin-bottom: 10px;
  font-weight: bold;
  color: var(--secondary-color);
}

@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
  }

  .box-content {
    flex-direction: column;
  }

  .counters-section {
    border-right: none;
    border-bottom: 1px dashed #ddd;
  }
}