* {
  box-sizing: border-box;
  transition: background-color 0.4s ease, color 0.4s ease;
}

body {
  font-family: "Poppins", sans-serif;
  background: #f0f4f8;
  margin: 40px auto;
  max-width: 460px;
  padding: 0 20px;
  color: #222;
  user-select: none;
  text-align: center;
}

h2 {
  font-weight: 700;
  margin-bottom: 25px;
  color: #ff4d88;
  text-shadow: 0 1px 5px rgba(255, 77, 136, 0.5);
}

#converter-card {
  background: white;
  border-radius: 20px;
  box-shadow: 0 12px 30px rgba(255, 77, 136, 0.15);
  padding: 30px 25px;
  position: relative;
  display: inline-block;
  min-width: 320px;
}

.bg-USD {
  background: linear-gradient(135deg, #1e90ff 0%, #00bfff 100%);
  color: white;
}
.bg-EUR {
  background: linear-gradient(135deg, #ff6f91 0%, #ff9671 100%);
  color: white;
}
.bg-GBP {
  background: linear-gradient(135deg, #7b2ff7 0%, #f107a3 100%);
  color: white;
}

input[type="number"],
select {
  width: 120px;
  padding: 12px 14px;
  margin: 10px 8px 20px 8px;
  border-radius: 15px;
  border: 2px solid #eee;
  font-size: 1.1rem;
  font-weight: 600;
  outline-offset: 3px;
  outline-color: transparent;
  cursor: pointer;
  box-shadow: inset 0 0 8px #fce4ec;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input[type="number"]:focus,
select:focus {
  outline-color: #ff4d88;
  border-color: #ff4d88;
  box-shadow: 0 0 15px #ff4d88;
}

button {
  background: #ff4d88;
  color: white;
  border: none;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 14px 25px;
  border-radius: 30px;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(255, 77, 136, 0.5);
  transition: transform 0.3s ease, background-color 0.3s ease,
    box-shadow 0.3s ease;
  user-select: none;
}

button:hover {
  background: #e6366f;
  transform: scale(1.05);
  box-shadow: 0 8px 24px rgba(230, 54, 111, 0.7);
}

/* Result */
#result {
  margin-top: 30px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  min-height: 38px;
  color: #ff4d88;
  text-shadow: 0 1px 3px rgba(255, 77, 136, 0.7);
}

/* Chart */
canvas {
  margin-top: 40px;
  border-radius: 15px;
  box-shadow: 0 10px 35px rgba(255, 77, 136, 0.15);
}

#loadingSpinner {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #ff4d88;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  animation: spin 1s linear infinite;
  margin: 30px auto 0;
  display: none;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

@media (max-width: 480px) {
  input[type="number"],
  select {
    width: 100%;
    margin: 10px 0 20px 0;
  }
  button {
    width: 100%;
  }
}