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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: #0a0a0c;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
}

.container {
  text-align: center;
}

.progress-container {
  display: flex;
  justify-content: space-between;
  position: relative;
  margin-bottom: 40px;
  max-width: 100%;
  width: 350px;
}

.progress-container::before {
  content: '';
  background-color: #2a2a35;
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 4px;
  width: 100%;
  z-index: -1;
}

.progress {
  background-color: #ffbf00;
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  height: 4px;
  width: 0%;
  z-index: -1;
  transition: 0.4s ease;
  box-shadow: 0 0 10px rgba(255, 191, 0, 0.4);
}

.circle {
  background-color: #0a0a0c;
  color: #6a6a75;
  border-radius: 50%;
  height: 35px;
  width: 35px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid #2a2a35;
  transition: 0.4s ease;
  font-weight: 600;
  font-size: 14px;
}

.circle.active {
  border-color: #ffbf00;
  color: #ffbf00;
  box-shadow: 0 0 15px rgba(255, 191, 0, 0.2);
}

.btn {
  background-color: #ffbf00;
  color: #0a0a0c;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  padding: 12px 35px;
  margin: 5px;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  transition: transform 0.1s, background-color 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 15px rgba(255, 191, 0, 0.2);
}

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

.btn:focus {
  outline: 0;
}

.btn:hover:not(:disabled) {
  background-color: #ffc933;
  box-shadow: 0 6px 20px rgba(255, 191, 0, 0.4);
}

.btn:disabled {
  background-color: #2a2a35;
  color: #4a4a55;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}