.problem-set-page {
  overflow-x: hidden;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.problem-set-page .topic-hero .container,
.problem-set-page main.container {
  max-width: 900px;
}

.problem-set-page .topic-hero {
  padding: 40px 0 24px;
}

.problem-list {
  display: grid;
  gap: 28px;
  min-width: 0;
}

.problem-set-context {
  min-width: 0;
  padding: 18px 20px;
  background: var(--surface-050);
  border-left: 3px solid var(--pnu-green);
  border-radius: var(--radius-sm);
}

.problem-set-context > :first-child {
  margin-top: 0;
}

.problem-set-context > :last-child {
  margin-bottom: 0;
}

.problem-card {
  min-width: 0;
  padding: clamp(20px, 4vw, 30px);
  background: var(--white);
  border: 1px solid var(--line-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.problem-card-header {
  margin-bottom: 18px;
}

.problem-number {
  display: block;
  margin-bottom: 5px;
  color: var(--pnu-blue);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.05em;
}

.problem-card h2 {
  margin: 0;
  color: var(--pnu-blue-dark);
  font-size: clamp(19px, 3vw, 23px);
  line-height: 1.35;
}

.problem-body > :first-child,
.solution-body > :first-child {
  margin-top: 0;
}

.problem-body,
.data-table-wrap {
  min-width: 0;
  max-width: 100%;
}

.problem-body > :last-child,
.solution-body > :last-child {
  margin-bottom: 0;
}

.problem-body ol,
.solution-body ol,
.problem-body ul,
.solution-body ul {
  padding-left: 1.35rem;
}

.problem-body li + li,
.solution-body li + li {
  margin-top: 7px;
}

.math-block {
  margin: 16px 0;
  padding: 13px 16px;
  overflow-x: auto;
  color: var(--pnu-blue-dark);
  font-family: var(--mono);
  font-weight: 700;
  text-align: center;
  background: var(--surface-050);
  border: 1px solid var(--line-200);
  border-radius: var(--radius-sm);
}

.code-block {
  margin: 16px 0;
  padding: 16px;
  overflow-x: auto;
  color: var(--ink-900);
  font: 13.5px/1.55 var(--mono);
  background: var(--surface-050);
  border: 1px solid var(--line-200);
  border-radius: var(--radius-sm);
}

.data-table-wrap {
  margin: 16px 0;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  min-width: 430px;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  border: 1px solid var(--line-200);
  text-align: left;
  font-variant-numeric: tabular-nums;
}

.data-table th:first-child,
.data-table td:first-child {
  text-align: left;
}

.data-table th {
  color: var(--pnu-blue-dark);
  background: var(--surface-050);
}

.solution-panel {
  margin-top: 22px;
  border-top: 1px solid var(--line-200);
}

.solution-panel summary {
  display: flex;
  align-items: center;
  min-height: 48px;
  color: var(--pnu-blue-dark);
  font-weight: 750;
  cursor: pointer;
  list-style: none;
}

.solution-panel summary::-webkit-details-marker {
  display: none;
}

.solution-panel summary::before {
  content: "+";
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  margin-right: 9px;
  color: var(--white);
  background: var(--pnu-blue);
  border-radius: 50%;
}

.solution-panel[open] summary::before {
  content: "−";
}

.solution-body {
  padding: 18px 20px;
  background: var(--callout-bg);
  border-radius: var(--radius-sm);
}

.misconception {
  margin-top: 16px;
  padding: 12px 14px;
  background: var(--white);
  border-left: 3px solid var(--pnu-green);
}

.problem-set-nav {
  display: flex;
  justify-content: center;
  margin-top: 42px;
}

.problem-set-nav a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  padding: 9px 18px;
  color: var(--pnu-blue-dark);
  font-weight: 700;
  text-decoration: none;
  background: var(--surface-050);
  border: 1px solid var(--line-200);
  border-radius: var(--radius-sm);
}

@media (max-width: 600px) {
  .problem-set-page .header-inner {
    align-items: flex-start;
  }

  .problem-card {
    padding: 20px 17px;
  }

}

@media print {
  .site-header,
  .problem-set-nav,
  .site-footer {
    display: none;
  }

  .problem-card {
    break-inside: avoid;
    box-shadow: none;
  }

  .solution-panel:not([open]) > :not(summary) {
    display: block;
  }
}