:root {
  --bg: #0e1116;
  --card: #161b22;
  --text: #e6edf3;
  --muted: #9da7b3;
  --border: #2b3240;
  --accent: #3b82f6;
  --radius: 14px;
  --shadow: 0 10px 25px rgba(0,0,0,.35);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.container {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  max-width: 700px;
  width: 90%;
}
h1 {
  text-align: center;
  margin-top: 0;
  font-size: 1.8rem;
}
.controls {
  margin-top: 1rem;
  text-align: center;
}
.checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: center;
  margin: 0.8rem 0;
}
button {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s;
}
button:hover { background: #2563eb; }

.output {
  margin-top: 2rem;
  text-align: center;
}
.problem {
  font-size: 1.2rem;
  font-weight: 600;
}
.solution-wrap {
  margin-top: 1rem;
}
.toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--accent);
  border-radius: 8px;
  padding: 0.4rem 0.8rem;
}
.solution {
  background: #0f1420;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  margin-top: 0.8rem;
  line-height: 1.5;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}


.request{
    font-weight: 100;
    font-size: xx-large;
    margin-left: 1rem;
}

.apex {
  font-size: 0.7em;
  vertical-align: super;
}