:root {
  color-scheme: light dark;
  --background: #f5f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5d6678;
  --line: #d9deea;
  --accent: #2855d9;
  --accent-hover: #1f43ad;
  --good: #087a42;
  --bad: #b42318;
  --code: #eef1f8;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-size: 16px;
  line-height: 1.55;
}

main {
  width: min(70rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3rem 0 5rem;
}

header { margin-bottom: 2rem; }

h1, h2 { line-height: 1.2; }
h1 { margin: 0.25rem 0 0.75rem; font-size: clamp(2rem, 5vw, 3.4rem); }
h2 { margin-top: 0; font-size: 1.25rem; }

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lede, .hint, section > p { color: var(--muted); }

section {
  margin: 1rem 0;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: var(--surface);
}

.status-card, .section-heading {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.status-card > div, .section-heading > div { flex: 1; }
.status { margin: 0; font-weight: 700; }
.status.pending { color: var(--muted); }
.status.ready { color: var(--good); }
.status.failed, .error { color: var(--bad); }
.error { min-height: 1.5em; }

button {
  min-height: 2.7rem;
  padding: 0.65rem 1rem;
  border: 0;
  border-radius: 0.5rem;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

button:hover:not(:disabled) { background: var(--accent-hover); }
button.secondary { background: #526079; }
button:disabled { cursor: not-allowed; opacity: 0.5; }

.formula, pre, textarea {
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--code);
}

.formula { padding: 1rem; }

textarea {
  width: 100%;
  min-height: 22rem;
  resize: vertical;
  padding: 1rem;
  color: var(--text);
  font: 0.9rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
}

pre {
  min-height: 8rem;
  margin-bottom: 0;
  padding: 1rem;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font: 0.86rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

dl { margin: 0; }
dl div { display: grid; grid-template-columns: 11rem minmax(0, 1fr); gap: 1rem; padding: 0.45rem 0; }
dt { color: var(--muted); font-weight: 700; }
dd { margin: 0; overflow-wrap: anywhere; }
a { color: var(--accent); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 46rem) {
  main { padding-top: 1.5rem; }
  .status-card, .section-heading { align-items: stretch; flex-direction: column; }
  .results { grid-template-columns: 1fr; }
  dl div { grid-template-columns: 1fr; gap: 0; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #10131a;
    --surface: #171c26;
    --text: #edf0f7;
    --muted: #aeb6c8;
    --line: #303849;
    --accent: #8aa7ff;
    --accent-hover: #6e8ff4;
    --good: #6ed39e;
    --bad: #ff928a;
    --code: #111620;
  }
  button { color: #0d1321; }
  button.secondary { color: #fff; }
}