body {
  margin: 0;
  font-family: Arial;
  color: white;
  text-align: center;

  background:
    linear-gradient(rgba(0,0,0,0.8), rgba(0,0,0,0.8)),
    url("bg.jpg");

  background-size: cover;
  background-position: center;
}

/* SCREENS */
.screen {
  display: none;
  height: 100vh;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.active {
  display: flex;
}

/* BUTTONS */
.btn {
  width: 80%;
  max-width: 280px;
  padding: 18px;
  margin: 10px;
  font-size: 18px;
  border-radius: 14px;
  border: none;
  color: white;
  backdrop-filter: blur(6px);
  transition: 0.2s;
}

.red {
  background: rgba(255, 0, 0, 0.25);
  border: 1px solid rgba(255,0,0,0.6);
}

.blue {
  background: rgba(0, 120, 255, 0.25);
  border: 1px solid rgba(0,120,255,0.6);
}

.btn:active {
  transform: scale(0.95);
}

/* LOCK */
.dots {
  display: flex;
  gap: 12px;
  margin: 20px;
}

.dots span {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid white;
}

.filled {
  background: white;
}

/* KEYPAD */
.pad {
  display: grid;
  grid-template-columns: repeat(3, 80px);
  gap: 15px;
}

.pad button {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  font-size: 20px;
  border: none;
  color: white;
  background: rgba(255,255,255,0.1);
}

.pad button:active {
  background: rgba(255,255,255,0.3);
}

.empty {
  background: transparent !important;
}

/* PLAYER DISC */
.disc {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  margin: 20px;
  position: relative;

  background: url("bg.jpg");
  background-size: cover;
  background-position: center;

  animation: spin 6s linear infinite;
}

/* CENTER HOLE */
.disc::after {
  content: "";
  width: 22px;
  height: 22px;
  background: black;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* OVERLAY */
.disc::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: rgba(0,0,0,0.25);
}

/* ANIMATION */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.slider {
  width: 80%;
}

.play {
  margin-top: 15px;
  padding: 12px 25px;
  font-size: 20px;
  border-radius: 10px;
  border: none;
  background: rgba(255,255,255,0.2);
  color: white;
}

/* SHAKE */
@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  50% { transform: translateX(6px); }
  75% { transform: translateX(-6px); }
  100% { transform: translateX(0); }
}