body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #0f0f0f, #1a1a2e);
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  overflow-x: hidden;
  transition: transform 0.3s ease;
}

header {
  width: 100%;
  background: #ffcc00;
  color: black;
  text-align: center;
  padding: 15px 0;
  font-size: 2rem;
  font-weight: bold;
  box-shadow: 0 0 20px #ffcc00;
}

.scale-select {
  margin: 15px;
  padding: 8px;
  border-radius: 6px;
  border: none;
  font-size: 1rem;
  cursor: pointer;
}

/* container now matches the HTML class name */
.container {
  display: flex;
  flex-direction: column;
  gap: 18px; /* space between buttons */
  margin-top: 20px;
  width: 90%;
  max-width: 420px;
  padding: 10px 0;
  align-items: center;
}

/* button styling to match the look in your image */
.btn {
  display: block;
  width: 100%;
  background: #ffcc00;
  color: black;
  padding: 18px 22px;
  border: none;
  border-radius: 14px;
  font-size: 1.15rem;
  font-weight: bold;
  cursor: pointer;
  text-align: center;
  /* two-layer shadow: dark "base" shadow under the button + yellow glow */
  box-shadow:
    0 8px 0 rgba(0,0,0,0.65),     /* dark flat shadow to create the "separated" look */
    0 0 20px rgba(255,204,0,0.45); /* soft yellow glow */
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

/* hover lifts the button slightly and increases glow */
.btn:hover {
  transform: translateY(-4px);
  box-shadow:
    0 12px 0 rgba(0,0,0,0.6),
    0 0 30px rgba(255,204,0,0.6);
}

/* active/pressed look */
.btn:active {
  transform: translateY(2px);
  box-shadow:
    0 4px 0 rgba(0,0,0,0.7),
    0 0 14px rgba(255,204,0,0.35);
}