:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f8fafc;
  color: #0f172a;
}

.app {
  max-width: 28rem;
  margin: 0 auto;
  padding: 1rem;
  display: grid;
  gap: 1rem;
}

h1, h2 {
  margin: 0;
}

.subtitle {
  margin: 0;
  color: #475569;
}

.card {
  display: grid;
  gap: 0.6rem;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 0.8rem;
  padding: 0.9rem;
}

input, button {
  font: inherit;
  padding: 0.7rem;
  border-radius: 0.6rem;
  border: 1px solid #cbd5e1;
}

input[type="number"] {
  appearance: textfield;
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

button {
  appearance: none;
  -webkit-appearance: none;
  background: #d3dda7;
  color: #000000;
  border: 0;
  cursor: pointer;
  opacity: 1;
}

button:disabled {
  background: #94a3b8;
  color: #ffffff;
  cursor: not-allowed;
  opacity: 1;
}

.result, .total {
  background: #f1f5f9;
  border-radius: 0.6rem;
  padding: 0.7rem;
}

.cart-list {
  margin: 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.2rem;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #020617;
    color: #e2e8f0;
  }
  .subtitle {
    color: #94a3b8;
  }
  .card {
    background: #0f172a;
    border-color: #1e293b;
  }
  input {
    background: #0b1220;
    color: #e2e8f0;
    border-color: #334155;
  }
  .result, .total {
    background: #0b1220;
  }
}