*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #1a1a2e;
  color: #eee;
  min-height: 100vh;
  overflow-x: hidden;
}

.screen {
  display: none;
  width: 100%;
  min-height: 100vh;
}

.screen.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hidden {
  display: none !important;
}

.btn {
  padding: 10px 24px;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: #e74c3c;
  color: white;
}

.btn-primary:hover {
  background: #c0392b;
}

.btn-secondary {
  background: #3498db;
  color: white;
}

.btn-secondary:hover {
  background: #2980b9;
}

.btn-success {
  background: #2ecc71;
  color: white;
}

.btn-success:hover {
  background: #27ae60;
}

.btn-warning {
  background: #f39c12;
  color: white;
}

.btn-warning:hover {
  background: #d68910;
}

.btn-danger {
  background: #e74c3c;
  color: white;
}

.btn-danger:hover {
  background: #c0392b;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

#game-layout {
  display: flex;
  gap: 20px;
  padding: 20px;
  width: 100%;
  min-height: 100vh;
  align-items: flex-start;
  justify-content: center;
}

input[type="text"] {
  padding: 10px 14px;
  border: 2px solid #444;
  border-radius: 6px;
  font-size: 16px;
  background: #16213e;
  color: #eee;
  outline: none;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  border-color: #3498db;
}

select {
  padding: 8px 12px;
  border: 2px solid #444;
  border-radius: 6px;
  font-size: 14px;
  background: #16213e;
  color: #eee;
  outline: none;
}