body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f6f7f9;
  color: #1f2933;
  line-height: 1.6;
}

header {
  background: #111827;
  color: white;
  padding: 70px 20px;
  text-align: center;
}

header h1 {
  font-size: 42px;
  margin-bottom: 10px;
}

header p {
  font-size: 18px;
  margin: 6px 0;
  color: #d1d5db;
}

nav {
  background: #1f2937;
  padding: 14px;
  text-align: center;
}

nav a {
  color: white;
  margin: 0 14px;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1050px;
  margin: 40px auto;
  padding: 0 20px;
}

.section-title {
  font-size: 28px;
  margin-bottom: 20px;
  border-bottom: 3px solid #2563eb;
  display: inline-block;
  padding-bottom: 5px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.card {
  background: white;
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  border: 1px solid #e5e7eb;
}

.card h3 {
  margin-top: 0;
  color: #111827;
}

.card p {
  color: #4b5563;
}

.tag {
  display: inline-block;
  background: #e0ecff;
  color: #1d4ed8;
  padding: 5px 9px;
  margin: 4px 4px 4px 0;
  border-radius: 999px;
  font-size: 13px;
  font-weight: bold;
}

.button {
  display: inline-block;
  margin-top: 14px;
  padding: 10px 14px;
  background: #2563eb;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}

.button:hover {
  background: #1d4ed8;
}

footer {
  text-align: center;
  padding: 30px;
  color: #6b7280;
}