* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: linear-gradient(135deg, #9900ff, #ff00c8);
}

.app-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-screen {
  background: #111;
  border-radius: 25px;
  width: 300px;
  padding: 20px;
  color: white;
  box-shadow: 0px 0px 20px rgba(0,0,0,0.5);
}

.app-header {
  text-align: center;
  margin-bottom: 20px;
}

.app-header img {
  width: 40px;
}

.app-header h2 {
  margin: 10px 0 5px;
}

.input-section {
  margin-bottom: 20px;
}

.input-section label {
  display: block;
  font-size: 12px;
  margin-bottom: 5px;
  color: #bbb;
}

.input-section input {
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 8px;
  margin-bottom: 10px;
  font-size: 14px;
}

.btn {
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  font-size: 14px;
  transition: transform 0.15s ease, opacity 0.15s ease; /* smooth clickable effect */
}

.deposit {
  background: #00c853;
  color: white;
}

.withdraw {
  background: #d32f2f;
  color: white;
}

/* ✅ Click animation */
.btn:active {
  transform: scale(0.92);  /* shrink a little when clicked */
  opacity: 0.8;            /* slight fade */
}

.balance-section {
  text-align: center;
  margin-top: 20px;
}

.balance-section h1 {
  margin-top: 10px;
  color: #00e676;
}