body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f8fafc;
  color: #0f172a;
}

/* HEADER */
header {
  display: flex;
  justify-content: space-between;
  padding: 18px 30px;
  background: #ffffff;
  border-bottom: 1px solid #e2e8f0;
}

.logo {
  font-weight: bold;
  color: #2563eb;
  font-size: 20px;
}

nav a {
  margin-left: 15px;
  color: #475569;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  color: #2563eb;
}

/* HERO */
.hero {
  text-align: center;
  padding: 90px 20px;
  background: linear-gradient(135deg, #eff6ff, #ffffff);
}

.hero h1 {
  font-size: 42px;
  color: #0f172a;
}

.hero p {
  color: #475569;
  font-size: 18px;
}

.hero button {
  padding: 12px 24px;
  margin-top: 20px;
  background: #2563eb;
  border: none;
  color: white;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
}

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

/* SECTIONS */
section {
  padding: 60px 20px;
  text-align: center;
}

h2 {
  color: #0f172a;
}

/* CARDS */
.grid {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.card {
  background: white;
  padding: 20px;
  width: 230px;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  transition: 0.3s;
  color: #0f172a;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.08);
}

/* FOOTER */
footer {
  text-align: center;
  padding: 20px;
  background: #ffffff;
  border-top: 1px solid #e2e8f0;
  color: #64748b;
}