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

body {
  background: #000000;
  color: #F5F5F5;
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  padding: 0;
}

.back-button {
  position: absolute;
  top: 20px;
  left: 20px;
  background-color: #ffcc00;
  color: black;
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 1rem;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.3s ease;
  z-index: 10;
}

.back-button:hover {
  background-color: #e6b800;
}

.spectrum-line {
  font-family: cursive;
  font-size: 2.5rem;
  text-align: center;
  margin: 30px 0;
  letter-spacing: 1px;
}

.spectrum-line span {
  display: inline-block;
  padding: 0 6px;
  animation: colorCycle 6s linear infinite;
}

.spectrum-line span:nth-child(1) {
  animation-delay: 0s;
}

.spectrum-line span:nth-child(2) {
  animation-delay: 0.8s;
}

.spectrum-line span:nth-child(3) {
  animation-delay: 1.6s;
}

.spectrum-line span:nth-child(4) {
  animation-delay: 2.4s;
}

.spectrum-line span:nth-child(5) {
  animation-delay: 3.2s;
}

.spectrum-line span:nth-child(6) {
  animation-delay: 4.0s;
}

@keyframes colorCycle {
  0% {
    color: #ffd39b;
  }

  16% {
    color: #7ae7c7;
  }

  33% {
    color: #ff8bdc;
  }

  50% {
    color: #9f7cf5;
  }

  66% {
    color: #6dd3ff;
  }

  83% {
    color: #ffe36b;
  }

  100% {
    color: #ffd39b;
  }
}

.circle-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 50px;
  max-width: 1200px;
  margin: 60px auto;
  padding: 0 40px;
}

.circle {
  width: 160px;
  height: 160px;
  background-color: black;
  border-radius: 50%;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  position: relative;
  margin: auto;
}

.circle img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 10px;
}

.circle:hover {
  transform: scale(1.08);
  box-shadow: 0 0 20px rgb(0, 225, 255);
}

.circle-label {
  margin-top: 10px;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
}

/* ----------------------
   Responsive Design
----------------------- */

/* Tablets (≤ 992px): 2 circles per row */
@media (max-width: 992px) {
  .circle-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 36px;
    padding: 0 20px;
  }

  .circle {
    width: 140px;
    height: 140px;
  }

  .spectrum-line {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .circle-container {
    grid-template-columns: repeat(2, 1fr);   /* Two circles per row */
    gap: 28px;
    padding: 0 10px;
    justify-items: center;
  }

  .circle {
    width: 110px;
    height: 110px;
  }

  .spectrum-line {
    font-size: 1.25rem;
    margin: 18px 0;
  }

  .back-button {
    font-size: 0.9rem;
    padding: 6px 12px;
    top: 12px;
    left: 12px;
  }
}


/* Small Phones (≤ 480px) */
@media (max-width: 480px) {
  .circle-container {
    gap: 18px;
    padding: 0 2px;
  }

  .circle {
    width: 85px;
    height: 85px;
  }

  .circle-label {
    font-size: 0.92rem;
    margin-top: 6px;
  }

  .back-button {
    font-size: 0.8rem;
    padding: 5px 9px;
    top: 6px;
    left: 6px;
  }
}