.code-reading-method {
  margin: 18px 0 24px;
  padding: 15px 18px;
  border: 1px solid var(--line, #cad8d6);
  border-left: 4px solid var(--primary, #176b66);
  background: color-mix(in srgb, var(--paper, #fff) 88%, #dcefeb 12%);
  color: var(--ink, #26343b);
}

.code-reading-method strong {
  display: block;
  margin-bottom: 7px;
  color: var(--primary, #176b66);
  font-size: .9rem;
}

.code-reading-method ol {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: code-reading-step;
}

.code-reading-method li {
  position: relative;
  min-width: 0;
  padding-left: 25px;
  color: var(--muted, #687582);
  font-size: .82rem;
  line-height: 1.55;
  counter-increment: code-reading-step;
}

.code-reading-method li::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 19px;
  height: 19px;
  border: 1px solid color-mix(in srgb, var(--primary, #176b66) 42%, transparent);
  border-radius: 50%;
  color: var(--primary, #176b66);
  content: counter(code-reading-step);
  font: 700 .68rem/18px ui-monospace, SFMono-Regular, Consolas, monospace;
  text-align: center;
}

.code-coach {
  margin: -10px 0 28px;
  border: 1px solid color-mix(in srgb, var(--primary, #176b66) 24%, var(--line, #cad8d6));
  background: var(--paper, #fff);
  box-shadow: 0 12px 28px rgba(29, 48, 52, .055);
}

.code-coach details > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 11px;
  padding: 14px 17px;
  color: var(--ink, #26343b);
  cursor: pointer;
  list-style: none;
}

.code-coach details > summary::-webkit-details-marker { display: none; }

.code-coach details > summary::before {
  display: grid;
  width: 23px;
  height: 23px;
  border: 1px solid color-mix(in srgb, var(--primary, #176b66) 45%, transparent);
  border-radius: 50%;
  color: var(--primary, #176b66);
  content: "+";
  font: 700 1rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  place-items: center;
}

.code-coach details[open] > summary::before { content: "−"; }

.code-coach-summary-copy {
  min-width: 0;
}

.code-coach-summary-copy small,
.code-coach-kind {
  display: block;
  color: var(--muted, #687582);
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.code-coach-summary-copy strong {
  display: block;
  overflow: hidden;
  margin-top: 2px;
  font-size: .92rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.code-coach-kind {
  padding: 4px 7px;
  border: 1px solid var(--line, #cad8d6);
  color: var(--primary, #176b66);
  white-space: nowrap;
}

.code-coach-body {
  padding: 5px 18px 20px;
  border-top: 1px solid var(--line, #cad8d6);
}

.code-coach-contract {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 15px 0 20px;
  border-top: 1px solid var(--line, #cad8d6);
  border-left: 1px solid var(--line, #cad8d6);
}

.code-coach-contract > div {
  min-width: 0;
  padding: 13px 14px;
  border-right: 1px solid var(--line, #cad8d6);
  border-bottom: 1px solid var(--line, #cad8d6);
}

.code-coach-contract small {
  display: block;
  margin-bottom: 5px;
  color: var(--primary, #176b66);
  font-size: .71rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.code-coach-contract p,
.code-coach-note p,
.code-coach-challenge p {
  margin: 0 !important;
  color: var(--muted, #687582) !important;
  font-size: .84rem !important;
  line-height: 1.7 !important;
}

.code-coach-heading {
  margin: 20px 0 9px;
  color: var(--ink, #26343b);
  font-size: .9rem;
}

.code-coach-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: coach-step;
}

.code-coach-steps li {
  position: relative;
  padding: 11px 0 11px 42px;
  border-top: 1px solid color-mix(in srgb, var(--line, #cad8d6) 72%, transparent);
  counter-increment: coach-step;
}

.code-coach-steps li::before {
  position: absolute;
  top: 12px;
  left: 3px;
  color: var(--primary, #176b66);
  content: "0" counter(coach-step);
  font: 700 .72rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.code-coach-steps b {
  display: block;
  margin-bottom: 4px;
  color: var(--ink, #26343b);
  font-size: .86rem;
}

.code-coach-steps span {
  display: block;
  color: var(--muted, #687582);
  font-size: .83rem;
  line-height: 1.7;
}

.code-coach-trace-wrap {
  overflow-x: auto;
  margin: 10px 0 18px;
  border: 1px solid var(--line, #cad8d6);
}

.code-coach-trace {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: .78rem;
}

.code-coach-trace th,
.code-coach-trace td {
  padding: 10px 12px;
  border-right: 1px solid var(--line, #cad8d6);
  border-bottom: 1px solid var(--line, #cad8d6);
  text-align: left;
  vertical-align: top;
}

.code-coach-trace th {
  background: color-mix(in srgb, var(--paper, #fff) 82%, #dcefeb 18%);
  color: var(--ink, #26343b);
  font-weight: 700;
}

.code-coach-trace tr:last-child td { border-bottom: 0; }
.code-coach-trace th:last-child,
.code-coach-trace td:last-child { border-right: 0; }

.code-coach-note,
.code-coach-challenge {
  margin-top: 12px;
  padding: 12px 14px;
  border-left: 3px solid #a15f2d;
  background: color-mix(in srgb, var(--paper, #fff) 90%, #fff0e2 10%);
}

.code-coach-challenge {
  border-left-color: var(--primary, #176b66);
  background: color-mix(in srgb, var(--paper, #fff) 88%, #dcefeb 12%);
}

.code-coach-note strong,
.code-coach-challenge strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ink, #26343b);
  font-size: .8rem;
}

@media (max-width: 760px) {
  .code-reading-method ol,
  .code-coach-contract { grid-template-columns: 1fr; }
  .code-reading-method li { min-height: 22px; }
  .code-coach details > summary { grid-template-columns: auto minmax(0, 1fr); }
  .code-coach-kind { display: none; }
  .code-coach-body { padding-inline: 14px; }
}

@media print {
  .code-coach details > summary::before { display: none; }
  .code-coach details:not([open]) > .code-coach-body { display: block; }
  .code-coach { break-inside: avoid; box-shadow: none; }
}