* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f9f9f9;
  color: #222;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}
.container {
  max-width: 400px;
  width: 100%;
  background: #fff;
  padding: 30px 25px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  text-align: center;
}
h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  font-weight: 700;
  color: #111;
  letter-spacing: 1.5px;
}
.balance {
  font-weight: 600;
  font-size: 1.25rem;
  margin-bottom: 25px;
  user-select: none;
  color: #444;
}
.slot-machine {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 25px;
}
.reel {
  font-size: 70px;
  width: 90px;
  height: 90px;
  background: #eee;
  border-radius: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  user-select: none;
  color: #222;
  box-shadow: inset 0 0 5px #ccc;
}
#spinBtn {
  background-color: #333;
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
  padding: 12px 35px;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  transition: background-color 0.25s ease;
  user-select: none;
}
#spinBtn:hover:not(:disabled) {
  background-color: #555;
}
#spinBtn:disabled {
  background-color: #aaa;
  cursor: not-allowed;
}
#result {
  margin-top: 30px;
  font-size: 1.3rem;
  min-height: 30px;
  color: #333;
  user-select: none;
}
.notice {
  margin-top: 40px;
  font-size: 0.85rem;
  color: #666;
  line-height: 1.4;
  user-select: none;
}
.qr-container {
  position: fixed;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  background: #fff;
  padding: 10px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  text-align: center;
  user-select: none;
  max-width: 130px;
}
.qr-container img {
  width: 110px;
  height: 110px;
  border-radius: 8px;
  margin-bottom: 8px;
}
.qr-container span {
  font-weight: 600;
  color: #222;
  font-size: 1rem;
}
@media (max-width: 600px) {
  body {
    flex-direction: column;
  }
  .container {
    margin: 20px auto 60px;
  }
  .qr-container {
    position: static;
    transform: none;
    margin: 20px auto 0;
    box-shadow: none;
    background: transparent;
    padding: 0;
  }
  .qr-container img {
    width: 90px;
    height: 90px;
  }
}