:root {
  --accent: __ACCENT__;
  --bg: #0b0d10;
  --text: #eef1f6;
  --muted: #93a0b5;
  --error: #ff6b6b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, sans-serif;
  color: var(--text);
  background: radial-gradient(800px 400px at 20% 0%, color-mix(in srgb, var(--accent) 25%, transparent), transparent), var(--bg);
  display: grid;
  place-items: center;
}

main {
  width: min(32rem, 100%);
  padding: 2rem;
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
}

h1 {
  margin: 0.5rem 0 1rem;
  font-size: 2.4rem;
}

.lead {
  color: var(--muted);
  line-height: 1.6;
}

.calc {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.calc label {
  font-size: 0.9rem;
  font-weight: 600;
}

.calc input {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, #2a3344);
  border-radius: 0.75rem;
  background: #12161d;
  color: var(--text);
  font: inherit;
}

.calc input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 60%, transparent);
  outline-offset: 2px;
}

.calc button {
  justify-self: start;
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: #081018;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.result {
  display: block;
  min-height: 1.5rem;
  margin-top: 1rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.result.error {
  color: var(--error);
}