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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, #ff6b6b 0%, #feca57 100%);
  min-height: 100vh;
  color: #333;
}

nav {
  background: rgba(0, 0, 0, 0.1);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav ul a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
}

nav ul a:hover {
  opacity: 0.8;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}

.card {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  margin-bottom: 2rem;
}

h1 {
  color: #e74c3c;
  margin-bottom: 1rem;
}

h2 {
  color: #e74c3c;
  margin-bottom: 1rem;
}

p {
  line-height: 1.6;
  margin-bottom: 1rem;
}

.hero {
  text-align: center;
  padding: 3rem 0;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: #666;
}

.btn {
  display: inline-block;
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  color: white;
  padding: 1rem 2rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: transform 0.2s, box-shadow 0.2s;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(231, 76, 60, 0.4);
}

.pizza-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

/* Calculator specific styles */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (max-width: 600px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}

.pizza-input {
  background: #f8f9fa;
  border-radius: 12px;
  padding: 1.5rem;
}

.pizza-input h3 {
  color: #e74c3c;
  margin-bottom: 1rem;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: #e74c3c;
}

.results {
  background: linear-gradient(135deg, #2c3e50, #34495e);
  color: white;
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
}

.results h3 {
  color: #feca57;
  margin-bottom: 1.5rem;
}

.result-item {
  margin-bottom: 1rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
}

.result-item .label {
  font-size: 0.9rem;
  opacity: 0.8;
}

.result-item .value {
  font-size: 1.5rem;
  font-weight: bold;
  color: #feca57;
}

.winner {
  background: linear-gradient(135deg, #27ae60, #2ecc71) !important;
  border: 3px solid #feca57;
}

/* About page */
.formula {
  background: #2c3e50;
  color: white;
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  font-size: 1.3rem;
  margin: 1.5rem 0;
  font-family: 'Courier New', monospace;
}

.example {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  border-left: 4px solid #e74c3c;
  margin: 1rem 0;
}

footer {
  text-align: center;
  padding: 2rem;
  color: white;
  opacity: 0.8;
}