.level-tabs [role="tablist"] { display: flex; flex-wrap: wrap; gap: 6px; border-bottom: 2px solid var(--line); padding-bottom: 8px; margin-top: 18px; }
.level-tabs [role="tab"] { border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 7px 14px; font-weight: 700; cursor: pointer; color: var(--ink-2); display: inline-flex; gap: 6px; align-items: center; }
.level-tabs [role="tab"][aria-selected="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }
.level-tabs [role="tab"] small { font-weight: 600; color: var(--muted); font-variant-numeric: tabular-nums; }
.level-tabs [role="tab"][aria-selected="true"] small { color: #7fdca4; }
.level-tabs [role="tabpanel"] { padding-top: 18px; }
.difficulty { display: inline-flex; gap: 3px; vertical-align: middle; }
.difficulty i { width: 10px; height: 14px; border-radius: 2px; background: var(--line); }
.difficulty i.on { background: var(--sale); }
.level-meta { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; margin-bottom: 12px; }
.progress-note { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
.tc-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; margin-top: 14px; }
.tc-actions label { display: inline-flex; gap: 6px; align-items: center; font-size: 14px; font-weight: 600; }
.tc summary .done { margin-left: auto; font-size: 12px; color: var(--brand); white-space: nowrap; }
.howto { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-top: 12px; }
.howto div { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.case-reference { margin-top: 18px; }
.tc { scroll-margin-top: 180px; }
#case-total { margin-top: 18px; }
.case-environments { margin: 10px 0 16px; }
.environment-data-table { min-width: 960px; table-layout: fixed; }
.environment-data-table th:first-child { width: 150px; }
.environment-data-table td, .environment-data-table th { vertical-align: top; font-size: 14px; }
.environment-data-table code { white-space: normal; overflow-wrap: anywhere; }
.environment-steps { min-width: 1160px; table-layout: fixed; margin: 0; }
.environment-steps th:first-child { width: 54px; }
.environment-steps th:nth-child(2) { width: 200px; }
.environment-steps td { vertical-align: top; font-size: 14px; }
.environment-steps code { display: block; white-space: normal; overflow-wrap: anywhere; margin-bottom: 8px; }
.step-expected { color: var(--ink-2); }
.step-expected strong { display: block; font-size: 12px; margin-top: 4px; }
.step-action-change { margin-bottom: 8px; }
.case-help { border: 1px solid var(--line); border-radius: 10px; margin-top: 12px; min-width: 0; }
.case-help > summary { padding: 12px 14px; font-size: 14px; }
.case-help > summary::before { content: "+"; color: var(--muted); }
.case-help[open] > summary::before { content: "−"; }
.case-help-body { padding: 0 14px 14px; min-width: 0; }
.case-help-body p { margin-top: 8px; }
.solution-form { display: flex; flex-wrap: wrap; align-items: end; gap: 12px; }
.solution-form label { flex: 1 1 200px; max-width: 360px; min-width: 0; }
.solution-form input { display: block; width: 100%; margin-top: 6px; }
.solution-form[hidden], .solution-content[hidden] { display: none; }
.solution-message { min-height: 1.5em; font-size: 14px; }
.solution-files details { margin-top: 10px; border-top: 1px solid var(--line); }
.solution-files summary { padding: 10px 0; overflow-wrap: anywhere; font-size: 14px; }
.solution-content pre { max-width: 100%; }
.solution-tools { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin: 14px 0; }
.case-reference .table-scroll, .tc-body .table-scroll { max-width: 100%; }
@media (max-width: 600px) {
  .tc > summary { padding: 12px; gap: 8px; }
  .tc-body { padding: 0 12px 14px; }
  .case-help-body { padding: 0 10px 12px; }
  .solution-form { display: block; }
  .solution-form button { margin-top: 10px; }
}