:root {
  --green-dark: #0f5132;
  --green-mid: #25a35a;
  --green-light: #6ee7b7;
}

body {
  margin: 0;
  font-family: 'Vazirmatn', sans-serif;
  background: linear-gradient(120deg, var(--green-dark), var(--green-mid), var(--green-light));
  background-size: 300% 300%;
  animation: gradientShift 10s ease infinite;
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

#logo {
  border-radius: 9999px;
  border: 4px solid rgba(255,255,255,0.85);
  width: 140px;
  height: 140px;
  object-fit: cover;
  box-shadow: 0 0 40px rgba(0,255,120,0.4);
}

.btn {
  position: relative;
  overflow: hidden;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(135deg, rgba(37,163,90,0.9), rgba(75,207,143,0.8));
  border-radius: 9999px;
  padding: 0.95rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(255,255,255,0.25), rgba(255,255,255,0));
  opacity: 0;
  transform: translateX(-80%);
  transition: all 0.5s ease;
}

.btn:hover::before {
  opacity: 1;
  transform: translateX(120%);
}

.btn:hover {
  box-shadow: 0 0 25px rgba(0,255,140,0.35);
  transform: translateY(-3px);
}

.btn i {
  font-size: 1.4rem;
  transition: transform 0.3s ease;
}

.btn:hover i {
  transform: scale(1.2) rotate(5deg);
}

@media (max-width:640px){
  #logo { width: 110px; height: 110px; }
}