:root {
  --primary-color: #27ae60;
  --hover-color: #2ecc71;
  --secondary-color: #2c3e50;
  --text-color: #FFFFFF;
  --background-gradient: linear-gradient(135deg, #2c3e50, #34495e);
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.1);
  --shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  --border-radius: 8px;
  --spacing-unit: 1rem;
  
  /* Colori etichette blister */
  --label-1cent: #FF0000;   /* rosso */
  --label-2cent: #8B4513;   /* marrone */
  --label-5cent: #800080;   /* viola */
  --label-10cent: #FFA500;  /* arancione */
  --label-20cent: #FFFF00;  /* giallo */
  --label-50cent: #808080;  /* grigio */
  --label-1euro: #008000;   /* verde */
  --label-2euro: #0000FF;   /* blu */
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  margin: 0;
  padding: var(--spacing-unit);
  color: var(--text-color);
  background: var(--background-gradient);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.05) 0%, transparent 70%);
  pointer-events: none;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(-10px, -10px) rotate(-2deg); }
  50% { transform: translate(10px, -15px) rotate(2deg); }
  75% { transform: translate(-15px, 5px) rotate(-1deg); }
}

.coin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-unit);
  padding: var(--spacing-unit);
  max-width: 1200px;
  margin: 0 auto;
}

.coin-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: calc(var(--spacing-unit) * 0.75);
  background: var(--card-bg);
  border-radius: var(--border-radius);
  border: 1px solid var(--card-border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.coin-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  background: rgba(255, 255, 255, 0.1);
}

.coin-image {
  position: relative;
  margin-bottom: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.coin-item img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.4));
  transition: transform 0.3s ease;
}

.coin-item:hover img {
  transform: scale(1.1);
}

.coin-item input[type='number'] {
  width: 100%;
  padding: calc(var(--spacing-unit) * 0.5);
  font-size: 1.1rem;
  border: solid 2px var(--primary-color);
  border-radius: var(--border-radius);
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-color);
  text-align: center;
  transition: all 0.3s ease;
  outline: none;
}

.coin-item input[type='number']:focus {
  border-color: var(--hover-color);
  box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2);
  transform: scale(1.05);
}

.coin-item input[type='number']::placeholder {
  color: #95a5a6;
  opacity: 0.7;
}

.coin-label {
  font-size: 0.9rem;
  color: var(--text-color);
  margin-top: calc(var(--spacing-unit) * 0.25);
  position: relative;
  padding: 8px 12px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.3);
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  transition: all 0.3s ease;
}

.coin-item:hover .coin-label {
  background: rgba(0, 0, 0, 0.5);
  transform: scale(1.05);
}

.coin-label:after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -5px;
  transform: translateX(-50%);
  width: 80%;
  height: 5px;
  transition: all 0.3s ease;
}

/* Colori specifici per ogni etichetta */
.neutro .coin-label:after { background-color: var(--label-1cent); }
.nera .coin-label:after { background-color: var(--label-2cent); }
.fucsia .coin-label:after { background-color: var(--label-5cent); }
.blu .coin-label:after { background-color: var(--label-10cent); }
.rosso .coin-label:after { background-color: var(--label-20cent); }
.verde .coin-label:after { background-color: var(--label-50cent); }
.gialla .coin-label:after { background-color: var(--label-1euro); }
.viola .coin-label:after { background-color: var(--label-2euro); }

h1 {
  font-size: 2.5rem;
  margin: calc(var(--spacing-unit) * 1.5) 0;
  color: var(--primary-color);
  text-align: center;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
  animation: fadeIn 0.9s ease-in;
}

button {
  padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 1.5);
  font-size: 1.1rem;
  border: none;
  border-radius: 30px;
  background-color: var(--primary-color);
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.3s ease;
  margin: var(--spacing-unit) auto;
  display: block;
  min-width: 160px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

button::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300%;
  height: 300%;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 10%, transparent 10.01%);
  transform: translate(-50%, -50%) scale(0);
  transition: transform 0.5s ease-out;
}

button:hover {
  background-color: var(--hover-color);
  transform: scale(1.05);
}

button:active::after {
  transform: translate(-50%, -50%) scale(1);
  opacity: 0;
  transition: transform 0s, opacity 0.5s;
}

#result {
  margin: calc(var(--spacing-unit) * 1.5) 0;
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--text-color);
  text-align: center;
  padding: var(--spacing-unit);
  background: var(--card-bg);
  border-radius: var(--border-radius);
  border: 1px solid var(--card-border);
  animation: glow 5s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 10px rgba(255,255,255,0.1); }
  50% { box-shadow: 0 0 20px rgba(255,255,255,0.3); }
}

#printField {
  width: 100%;
  max-width: 300px;
  padding: calc(var(--spacing-unit) * 0.5);
  font-size: 1rem;
  border-radius: var(--border-radius);
  border: 2px solid var(--primary-color);
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-color);
  text-align: center;
  margin: var(--spacing-unit) auto;
  display: block;
  transition: all 0.3s ease;
}

#printField:focus {
  outline: none;
  border-color: var(--hover-color);
  box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2);
  transform: scale(1.02);
}

/* Media Queries ottimizzate per mobile */
@media (max-width: 480px) {
  .coin-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--spacing-unit) * 0.5);
  }

  .coin-item img {
    width: 60px;
    height: 60px;
  }

  .coin-item {
    padding: calc(var(--spacing-unit) * 0.5);
  }

  h1 {
    font-size: 1.8rem;
  }

  button {
    width: 100%;
    max-width: 200px;
    padding: calc(var(--spacing-unit) * 0.5);
    font-size: 1rem;
  }

  #printField {
    max-width: 200px;
  }

  .coin-item input[type='number'] {
    font-size: 1rem;
    padding: calc(var(--spacing-unit) * 0.3);
  }
}

@media (min-width: 481px) and (max-width: 768px) {
  .coin-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 769px) {
  .coin-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .coin-item img {
    width: 100px;
    height: 100px;
  }

  h1 {
    font-size: 2.5rem;
  }

  button {
    font-size: 1.2rem;
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
  }
}