:root {
  --bg: #140e0c;
  --card: #241814;
  --ink: #f6efe6;
  --muted: #cbb8a8;
  --line: #4a332a;
  --ember: #e8893a;
  --ember-ink: #1a100c;
  --field: #1b120f;
  --good: #f3d7b0;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { font-size: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(1200px 400px at 50% -10%, #3a2218 0%, transparent 55%),
    var(--bg);
  color: var(--ink);
  line-height: 1.45;
}

button, input { font: inherit; color: inherit; }

.app {
  width: min(100%, 34rem);
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mark {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.7rem;
  background: #1a100c;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.45rem;
  color: var(--ember);
  flex: none;
}

h1 {
  margin: 0;
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.card {
  margin-top: 1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1rem;
}

.switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
  background: #1b120f;
  padding: 0.3rem;
  border-radius: 0.8rem;
}

.switch button {
  min-height: 2.9rem;
  border: 0;
  border-radius: 0.6rem;
  background: transparent;
  color: var(--muted);
  font-weight: 650;
}

.switch button[aria-pressed="true"] {
  background: var(--ember);
  color: var(--ember-ink);
}

.note {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

h2 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
}

.source {
  margin: 0 0 0.85rem;
  color: var(--good);
  font-size: 0.92rem;
}

.grid {
  display: grid;
  gap: 0.75rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.92rem;
  font-weight: 650;
}

input[type="number"] {
  width: 100%;
  min-height: 3rem;
  padding: 0.55rem 0.75rem;
  border-radius: 0.7rem;
  border: 1px solid var(--line);
  background: var(--field);
}

input:focus-visible, button:focus-visible {
  outline: 3px solid var(--ember);
  outline-offset: 2px;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 3rem;
  font-weight: 700;
}

.check input {
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--ember);
}

.result {
  margin-top: 0.9rem;
  padding: 0.9rem;
  border-radius: 0.85rem;
  background: #1b120f;
  border: 1px solid var(--line);
}

.rule-name {
  margin: 0;
  font-weight: 800;
  color: var(--ember);
}

.formula, .worked, .buy, .char {
  margin: 0.45rem 0 0;
}

.buy {
  font-size: 1.25rem;
  font-weight: 800;
}

.faq h2 { margin-bottom: 0.6rem; }

.faq details {
  border-top: 1px solid var(--line);
  padding: 0.7rem 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 750;
}

.faq p { margin: 0.45rem 0 0; color: var(--muted); }

.foot {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

[hidden] { display: none !important; }