html {
  font-size: 16px;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  margin: 0;
  background: #f0f0f0;
  color: #333;
  display: flex;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
}

.container {
  text-align: center;
  padding: 2rem;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  max-width: 320px;
  width: 90%;
}

h1 {
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  color: #333;
}

.timer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.time-segment {
  flex: 1;
  background: #fafafa;
  border-radius: 8px;
  padding: 1rem 0.5rem;
}

.number {
  display: block;
  font-weight: bold;
  font-size: 1.5rem;
  color: #333;
}

.label {
  display: block;
  font-size: 0.75rem;
  color: #666;
  margin-top: 0.25rem;
}

.footer-text {
  font-size: 0.875rem;
  color: #666;
}

@media (min-width: 768px) {
  .container {
    max-width: 500px;
  }
  h1 {
    font-size: 2rem;
  }
  .number {
    font-size: 2rem;
  }
}