* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 0 20px;
}

header {
  background: #111827;
  color: white;
  padding: 15px 0;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a {
  color: white;
  margin-left: 20px;
  text-decoration: none;
  font-size: 14px;
}

.logo {
  font-weight: bold;
  font-size: 18px;
}

.hero {
  background: linear-gradient(135deg, #1f2937, #2563eb);
  color: white;
  padding: 100px 0;
  text-align: center;
}

.hero h1 {
  margin-bottom: 20px;
  font-size: 36px;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  background: #2563eb;
  color: white;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
}

.section {
  padding: 70px 0;
}

.section.light {
  background: #e5e7eb;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.card {
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

form {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-top: 20px;
}

input, textarea {
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #ccc;
}

footer {
  background: #111827;
  color: #aaa;
  padding: 20px 0;
  text-align: center;
  font-size: 14px;
}