/* Reset and Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  background-color: #f7fdf9;
  color: #222;
}

/* Header */
.main-header {
  background-color: #3498db;
  color: white;
  padding: 1rem 2rem;
  text-align: center;
}

.main-header h1 {
  margin-bottom: 0.5rem;
}

.main-header nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.main-header nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  transition: background 0.3s ease;
}

.main-header nav ul li a:hover {
  background-color: #40916c;
}

/* Hero Section */
.hero {
  background-color: #d8f3dc;
  padding: 3rem 1rem;
  text-align: center;
}

.hero h2 {
  font-size: 2rem;
  color: #1b4332;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: #3498db;
}

/* Tools Section */
.tools {
  padding: 2rem 1rem;
  max-width: 1200px;
  margin: auto;
}

.tools h2 {
  text-align: center;
  margin-bottom: 2rem;
  color: #1b4332;
}

/* Cards */
.card-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: #ffffff;
  border: 1px solid #ccc;
  border-left: 5px solid #3498db;
  padding: 1.5rem;
  border-radius: 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card h3 {
  margin-bottom: 0.5rem;
  color: #3498db;
}

.card p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.card a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: #3498db;
  color: white;
  border-radius: 5px;
  text-decoration: none;
  transition: background 0.3s ease;
}
.card a:hover {
  background-color: #40916c;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
/* for bmi calculator */
.calculator {
  padding: 2rem;
  max-width: 400px;
  margin: auto;
  background-color: #f9fbe7;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

.calculator h2 {
  text-align: center;
  margin-bottom: 1rem;
}

.calculator form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.calculator input, .calculator button {
  padding: 0.5rem;
  font-size: 1rem;
}

.calculator button {
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.calculator button:hover {
  background-color: #388e3c;
}

#bmi-result {
  margin-top: 1rem;
  text-align: center;
  font-weight: bold;
}
/* Responsive Fix */
@media (max-width: 600px) {
  .main-header nav ul {
    flex-direction: column;
    gap: 1rem;
  }
}