/* Deliberately plain. An operator reads this on a SCADA workstation in a
   control room, often on a screen with poor contrast, standing up. Large type,
   high contrast, no animation. */

:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5a5a5a;
  --line: #d4d4d4;
  --chip: #eef2f7;
  --scope: #fff6e5;
  --scope-line: #d99b00;
  --fixture: #ffe9e9;
  --fixture-line: #c0392b;
  --error: #c0392b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
}

main { max-width: 60rem; margin: 0 auto; padding: 2rem 1.25rem 4rem; }

h1 { font-size: 1.5rem; margin: 0 0 0.25rem; }
.subtitle { color: var(--muted); margin: 0 0 1.5rem; }

textarea {
  width: 100%;
  padding: 0.75rem;
  font: inherit;
  border: 1px solid var(--line);
  border-radius: 6px;
  resize: vertical;
}

.row { display: flex; align-items: center; gap: 1rem; margin-top: 0.75rem; }

button {
  padding: 0.55rem 1.4rem;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: #12507a;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
button:disabled { background: #9aa7b1; cursor: default; }

label { color: var(--muted); display: flex; align-items: center; gap: 0.4rem; }

.error {
  margin-top: 1.5rem;
  padding: 0.75rem 1rem;
  border-left: 4px solid var(--error);
  background: var(--fixture);
}

.answer { margin-top: 2rem; }

.class-chip {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--chip);
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* The two banners are the same visual weight as the answer itself, on purpose.
   A scope limit rendered as fine print is a scope limit nobody reads. */
.banner {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  border-left: 4px solid;
  font-size: 0.95rem;
}
.banner.scope { background: var(--scope); border-color: var(--scope-line); }
.banner.fixture { background: var(--fixture); border-color: var(--fixture-line); }

.prose { font-size: 1.08rem; white-space: pre-wrap; }
.deferral { padding-left: 1rem; border-left: 3px solid var(--line); color: var(--muted); }

.block { margin-top: 1.75rem; }
.block h3 { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }

dl { display: grid; grid-template-columns: 11rem 1fr; gap: 0.35rem 1rem; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; }

table { width: 100%; border-collapse: collapse; margin-top: 0.5rem; }
th, td { text-align: left; padding: 0.45rem 0.5rem; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 0.9rem; }

q { font-style: italic; }
.cite { color: var(--muted); }

.working { margin-top: 2rem; border-top: 1px solid var(--line); padding-top: 1rem; }
.working summary { cursor: pointer; color: var(--muted); font-weight: 600; }
.working h4 { margin: 1rem 0 0.35rem; font-size: 0.9rem; color: var(--muted); }
pre {
  background: #f6f8fa;
  padding: 0.75rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.85rem;
}
code { font-size: 0.9em; }