@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&display=swap');

:root {
  --bg: #1c1f2b;
  --register-bg: #d9d9d9;
  --display-bg: #202020;
  --screen-text: #39ff14;
  --btn-bg: #888;
  --btn-hover: #555;
  --primary: #333;
  --accent: #007bff;
  --border-radius: 10px;
}

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

body {
  background-color: var(--bg);
  font-family: 'Share Tech Mono', monospace;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: start;
  min-height: 100vh;
  padding: 2rem 1rem;
  color: white;
  text-align: center;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 1.5rem;
}

.input-div {
  background-color: #2a2a2a;
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 2rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}

.input-div label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.user-input {
  width: 100%;
  padding: 0.6rem;
  font-size: 1rem;
  border-radius: var(--border-radius);
  border: 1px solid #ccc;
  margin-bottom: 1rem;
}

.check-btn-styles {
  background-color: var(--accent);
  color: white;
  font-size: 1rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.3s ease;
  width: 100%;
}

.check-btn-styles:hover {
  background-color: #0056b3;
}

#change-due {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  min-height: 1.5rem;
}

.container {
  background-color: var(--register-bg);
  border-radius: var(--border-radius);
  padding: 1rem;
  max-width: 400px;
  width: 100%;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.top-display-screen-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--display-bg);
  color: var(--screen-text);
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
}

.price-screen {
  font-size: 1.4rem;
  min-height: 2rem;
}

.connector {
  width: 60%;
  height: 10px;
  background-color: var(--display-bg);
  border-radius: 5px;
  margin-top: 0.5rem;
}

.top-register {
  background-color: #c2c2c2;
  border-radius: var(--border-radius);
  padding: 1rem;
  margin-bottom: 1rem;
}

.btns-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.btn {
  background-color: var(--btn-bg);
  border: none;
  padding: 1rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.btn:hover {
  background-color: var(--btn-hover);
}

.cash-drawer-display {
  background-color: #fff;
  padding: 0.8rem;
  border-radius: var(--border-radius);
  min-height: 2rem;
  font-size: 1rem;
  color: var(--primary);
}

.bottom-register {
  background-color: #999;
  padding: 1rem;
  border-radius: var(--border-radius);
  display: flex;
  justify-content: center;
}

.circle {
  width: 40px;
  height: 40px;
  background-color: #555;
  border-radius: 50%;
}

@media (max-width: 480px) {
  .container {
    width: 90%;
  }

  .btn {
    padding: 0.8rem;
  }
}