body {
  font-family: "Vazirmatn", Tahoma;
  background: linear-gradient(135deg,#e0f7fa,#fff);
  text-align: center;
  margin: 0;
  padding: 40px;
}

h1 {
  color: #2c3e50;
}

.subtitle {
  margin-bottom: 30px;
  color: #555;
}

.grades {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
  max-width: 800px;
  margin: auto;
}

.grade {
  padding: 30px 20px;
  border-radius: 18px;
  font-size: 20px;
  color: white;
  text-decoration: none;
  transition: transform 0.3s, box-shadow 0.3s;
}

.grade:hover {
  transform: scale(1.07);
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

/* رنگ‌ها */
.g1 { background:#ff7675; }
.g2 { background:#fdcb6e; }
.g3 { background:#55efc4; }
.g4 { background:#74b9ff; }
.g5 { background:#a29bfe; }
.g6 { background:#fd79a8; }

footer {
  margin-top: 50px;
  color: #777;
}