:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e67e22;
  --background: #f8f9fa;
  --text-color: #333;
  --border-color: #e5e7eb;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--background);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  background: var(--primary-color);
  padding: 1rem;
}

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

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

.nav-links a {
  color: white;
  text-decoration: none;
  margin-left: 1.5rem;
}

.wrapper {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1rem;
}

.calculator-container {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.result-card {
  background: var(--accent-color);
  color: white;
  padding: 1rem;
  border-radius: 8px;
  margin-top: 1rem;
}

.result-card span {
  font-weight: bold;
}

.why-use-section ul,
.content-section ul,
.content-section ol {
  margin-left: 1rem;
}

.footer {
  background: var(--primary-color);
  color: white;
  text-align: center;
  padding: 1rem;
  margin-top: auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: white;
  text-decoration: none;
  font-size: 0.9rem;
}