:root {
  --bg-main: #f8f9fa;
  --surface: #ffffff;
  --text-primary: #2b2d42;
  --text-muted: #6c757d;
  --border-color: #e9ecef;
  
  --color-success: #e2f0d9;
  --text-success: #2e5a1c;
  --color-error: #fce4d6;
  --text-error: #a61c1c;
  
  --accent-btn: #4a6fa5;
  --accent-btn-hover: #3b5984;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  margin: 0;
  padding: 30px 15px;
}

.container {
  max-width: 960px;
  margin: 0 auto;
}

header {
  margin-bottom: 24px;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  font-size: 2rem;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.5px;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: none;
  border: 1px solid var(--border-color);
  background-color: var(--surface);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.mode-selector {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.mode-btn {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 6px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.9rem;
}

.mode-btn.active {
  background-color: var(--accent-btn);
  color: #fff;
  border-color: var(--accent-btn);
}

.controls {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

input {
  padding: 10px 14px;
  font-size: 1rem;
  width: 240px;
  border: 1px solid #ced4da;
  border-radius: 8px;
  outline: none;
  background-color: var(--surface);
}

button#btnInvia, button#btnArrendo {
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

button#btnInvia {
  background-color: var(--accent-btn);
  color: #ffffff;
}

.btn-danger {
  background-color: #e63946;
  color: #ffffff;
}

.game-status {
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  font-weight: 500;
}

.table-container {
  background-color: var(--surface);
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
  overflow-x: auto;
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
  min-width: 650px;
}

th {
  background-color: #f1f3f5;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  padding: 12px 8px;
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 12px 8px;
  font-size: 0.95rem;
  border-bottom: 1px solid var(--border-color);
}

.verde {
  background-color: var(--color-success);
  color: var(--text-success);
  font-weight: 600;
}

.rosso {
  background-color: var(--color-error);
  color: var(--text-error);
}

/* Animazione Svelamento Cella per Cella */
tbody td.cell-flip {
  opacity: 0;
  transform: rotateX(-90deg);
  animation: flipIn 0.4s ease-out forwards;
}

@keyframes flipIn {
  0% {
    opacity: 0;
    transform: rotateX(-90deg);
  }
  100% {
    opacity: 1;
    transform: rotateX(0deg);
  }
}

footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

footer a {
  color: var(--accent-btn);
  text-decoration: none;
}

/* Modali */
.modal {
  display: none;
  position: fixed;
  z-index: 100;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
  background-color: var(--surface);
  margin: 10% auto;
  padding: 24px;
  border-radius: 12px;
  width: 90%;
  max-width: 500px;
  position: relative;
}

.close-btn {
  position: absolute;
  right: 16px;
  top: 12px;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

.badge-demo {
  padding: 2px 6px;
  border-radius: 4px;
}

.stats-grid {
  display: flex;
  justify-content: space-around;
  margin-top: 20px;
}

.stat-box {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-box span:first-child {
  font-size: 1.8rem;
  font-weight: bold;
}