:root {
  color-scheme: dark;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  --bg: #0d1117;
  --fg: #e6edf3;
  --panel: #161b22;
  --border: #30363d;
  --border-strong: #484f58;
  --applied-bg: #238636;
  --applied-fg: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
}

main {
  width: 100%;
  max-width: 60rem;
  margin: 0 auto;
  padding: 1rem;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 50rem) {
  main {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  h1,
  .lede {
    grid-column: 1 / -1;
  }
}

h1 {
  margin: 0;
  font-size: 1.75rem;
}

.lede {
  margin: 0;
  opacity: 0.75;
}

form {
  display: grid;
  gap: 1rem;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  display: grid;
  gap: 0.75rem;
}

legend {
  font-weight: 600;
  padding: 0 0.4rem;
}

label {
  display: grid;
  gap: 0.25rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

input[type="number"],
input[type="text"] {
  font: inherit;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--panel);
  color: inherit;
  width: 100%;
}

input[type="number"]:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--border-strong);
}

input[type="checkbox"] {
  margin: 0;
}

button {
  font: inherit;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

button:hover {
  background: var(--panel);
  border-color: var(--border-strong);
}

button.reset {
  justify-self: start;
  opacity: 0.7;
}

.hint {
  font-size: 0.85rem;
  opacity: 0.75;
  margin: 0;
}

#breakdown {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  align-self: start;
}

#breakdown h2 {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
}

dl {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.4rem 1rem;
  margin: 0;
}

dt {
  margin: 0;
}

dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.grand-total {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  font-variant-numeric: tabular-nums;
}

.cap-status {
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  opacity: 0.8;
}

.cap-status.met {
  color: var(--applied-bg);
  opacity: 1;
  font-weight: 600;
}

#topUpButton.applied {
  background: var(--applied-bg);
  color: var(--applied-fg);
  border-color: var(--applied-bg);
}

#topUpButton.applied:hover {
  background: var(--applied-bg);
  border-color: var(--applied-bg);
  filter: brightness(1.08);
}

#topUpButton.applied::before {
  content: "\2713\00a0";
}