:root {
  --bg: #faf7f2;
  --card: #ffffff;
  --ink: #2b2620;
  --sub: #6b6257;
  --line: #e6ddd1;
  --accent: #b5654a;      /* terracotta — yarn-adjacent, not candy */
  --accent-ink: #ffffff;
  --ok: #3e7d5a;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}
main { max-width: 720px; margin: 0 auto; padding: 24px 18px 40px; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 12px 0 8px; }
h2 { font-size: 1.3rem; margin: 34px 0 10px; }
h3 { font-size: 1.02rem; margin: 18px 0 4px; }
p { margin: 8px 0; }
.lead { color: var(--sub); font-size: 1.05rem; }
code {
  font-family: var(--mono);
  font-size: .86em;
  background: #f1ebe2;
  padding: 1px 5px;
  border-radius: 4px;
}
.examples li { margin: 10px 0; }
.examples code { display: inline-block; margin-top: 3px; }

/* tool card */
.tool {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  margin: 22px 0 8px;
  box-shadow: 0 1px 3px rgba(43,38,32,.06);
}
.fields { display: flex; gap: 12px; flex-wrap: wrap; }
.fields label { flex: 1 1 140px; font-size: .82rem; color: var(--sub); font-weight: 600; }
.fields input {
  display: block; width: 100%; margin-top: 4px;
  font-size: 1.25rem; font-family: var(--mono);
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px;
  background: #fffdf9; color: var(--ink);
}
.fields input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.mode { border: 0; padding: 0; margin: 14px 0 0; display: flex; gap: 18px; }
.mode label { font-size: .95rem; display: flex; align-items: center; gap: 6px; }
.mode input { accent-color: var(--accent); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip: rect(0 0 0 0); overflow: hidden; white-space: nowrap;
}
.result { margin-top: 16px; border-top: 1px dashed var(--line); padding-top: 14px; }
#instruction {
  display: block;
  font-family: var(--mono);
  font-size: 1.02rem;
  line-height: 1.5;
  background: #2f2a24; color: #f3ede4;
  padding: 12px 14px; border-radius: 10px;
  min-height: 1.5em;
  word-break: break-word;
}
#instruction.error { background: #fdf0ec; color: #8c3b22; border: 1px solid #eccfc4; }
#copy {
  margin-top: 10px;
  font-size: .95rem; font-weight: 600;
  background: var(--accent); color: var(--accent-ink);
  border: 0; border-radius: 8px; padding: 8px 18px; cursor: pointer;
}
#copy:active { transform: translateY(1px); }
#copy.done { background: var(--ok); }
#summary { color: var(--sub); font-size: .92rem; margin: 10px 0 6px; }
#viz { width: 100%; height: 14px; border-radius: 4px; background: #f1ebe2; display: block; }

/* table */
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--sub); font-size: .82rem; }
td:nth-child(2) { font-family: var(--mono); font-size: .88rem; }

footer {
  border-top: 1px solid var(--line);
  color: var(--sub); font-size: .88rem;
  text-align: center; padding: 18px 12px 30px;
}
footer a { color: var(--sub); }