:root {
  --primary-color: #00c853;
  --secondary-color: #121212;
  --text-color: #ffffff;
  --border-color: #2a2a2a;
  --accent-color: #333333;
  --error-color: #ff3d00;
  --success-color: #00c853;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans",
    "Helvetica Neue", sans-serif;
}

body {
  background-color: var(--secondary-color);
  color: var(--text-color);
  min-height: 100vh;
  max-width: 480px;
  margin: 0 auto;
  position: relative;
}

.container {
  padding: 20px;
}

.btn {
  display: block;
  width: 100%;
  padding: 14px;
  border-radius: 8px;
  border: none;
  background-color: var(--primary-color);
  color: var(--secondary-color);
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  text-align: center;
  margin-top: 20px;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
}