.case-learning {
  --cl-paper: #f7f7f1;
  --cl-ink: #233e33;
  --cl-muted: #617164;
  --cl-green: #214e43;
  --cl-line: #d8dfd0;
  --cl-accent: #b1794c;
  background: var(--cl-paper);
  color: var(--cl-ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.85;
  min-width: 0;
  min-height: 100vh;
}
.case-learning *, .case-learning *::before, .case-learning *::after { box-sizing: border-box; }
.case-learning h1, .case-learning h2, .case-learning h3, .case-learning p { margin: 0; }
.case-learning button, .case-learning summary { font: inherit; }
.case-learning button:focus-visible, .case-learning summary:focus-visible, .case-learning [tabindex]:focus-visible {
  outline: 3px solid var(--cl-accent);
  outline-offset: 4px;
}
.cl-topbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 5%; border-bottom: 1px solid var(--cl-line); }
.cl-brand { display: flex; align-items: baseline; gap: 15px; }
.cl-brand strong { color: var(--cl-green); font-size: 19px; letter-spacing: 3px; }
.cl-brand span { font-size: 12px; color: var(--cl-muted); }
.cl-content { width: min(100%, 1140px); margin: 0 auto; padding: 0 48px 44px; min-width: 0; }
.cl-content > * { min-width: 0; }
.cl-hero { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(230px, 1fr); align-items: center; gap: 52px; padding: 64px 0 40px; }
.cl-kicker { color: var(--cl-muted); font-size: 12px; letter-spacing: 1.2px; }
.case-learning h1 { font-size: clamp(32px, 4vw, 47px); font-weight: 500; letter-spacing: -1px; line-height: 1.4; margin: 13px 0 20px; }
.cl-lead { color: var(--cl-muted); max-width: 570px; font-size: 16px; }
.case-learning .cl-data-label { display: inline-block; margin-top: 24px; color: var(--cl-green); background: #e8ede1; padding: 7px 12px; border-radius: 3px; font-size: 12px; }
.cl-reading-guide { padding: 25px 28px; background: #e8eddf; border-left: 3px solid #a5b594; }
.cl-reading-guide > span { font-size: 13px; color: var(--cl-muted); }
.cl-reading-guide ol { margin: 13px 0 0; padding-left: 21px; }
.cl-reading-guide li { padding: 4px 0; font-size: 14px; }
.case-learning .cl-basis { color: var(--cl-muted); font-size: 13px; padding: 20px 0 30px; border-bottom: 1px solid var(--cl-line); }
.cl-exercise { padding: 49px 0 44px; border-bottom: 1px solid var(--cl-line); min-width: 0; }
.cl-exercise-heading { display: grid; grid-template-columns: 43px minmax(0, 1fr); gap: 16px; align-items: start; }
.cl-number { color: #7b9371; font-size: 19px; padding-top: 1px; font-variant-numeric: tabular-nums; }
.case-learning .cl-exercise h2 { font-size: clamp(23px, 2.6vw, 29px); font-weight: 500; line-height: 1.6; margin-top: 8px; }
.case-learning .cl-question { margin-top: 23px; font-size: 15px; color: var(--cl-muted); }
.cl-table-scroll { width: 100%; max-width: 100%; min-width: 0; overflow-x: auto; overscroll-behavior-x: contain; margin: 24px 0; border: 1px solid var(--cl-line); border-radius: 4px; background: #fbfcf7; }
.cl-table-scroll table { width: 100%; min-width: 570px; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
.cl-table-scroll caption { text-align: left; font-weight: 500; color: var(--cl-green); padding: 15px 18px; background: #edf1e6; border-bottom: 1px solid var(--cl-line); }
.cl-table-scroll th, .cl-table-scroll td { text-align: right; vertical-align: top; border-bottom: 1px solid #e5e9df; padding: 12px 18px; }
.cl-table-scroll tr > :first-child { text-align: left; }
.cl-table-scroll thead th { background: #f1f4eb; color: #61735b; font-weight: 500; }
.cl-table-scroll tbody th { font-weight: 500; color: var(--cl-ink); }
.cl-table-scroll tbody td { color: #4e6354; }
.cl-table-scroll tbody tr:last-child > * { border-bottom: 0; }
.case-learning .cl-think { color: var(--cl-muted); background: #efeee5; padding: 17px 20px; margin: 20px 0; border-radius: 3px; font-size: 14px; }
.cl-think strong { display: block; color: #766746; margin-bottom: 4px; font-weight: 600; }
.cl-answer { margin-top: 22px; border: 1px solid var(--cl-line); background: #fbfcf7; border-radius: 4px; }
.cl-answer summary { display: flex; align-items: center; justify-content: space-between; gap: 15px; cursor: pointer; padding: 19px 23px; min-height: 60px; color: var(--cl-green); font-size: 14px; font-weight: 500; list-style: none; }
.cl-answer summary::-webkit-details-marker { display: none; }
.cl-answer summary:hover { background: #edf1e7; }
.cl-toggle { font-size: 24px; font-weight: 400; line-height: 1; flex: 0 0 auto; }
.cl-answer[open] .cl-toggle { transform: rotate(45deg); }
.cl-answer[open] summary { border-bottom: 1px solid var(--cl-line); background: #edf1e7; }
.cl-answer-body { padding: 26px 27px; min-width: 0; }
.cl-result { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px 25px; padding-bottom: 22px; border-bottom: 1px solid var(--cl-line); }
.cl-result > span { font-size: 13px; color: var(--cl-muted); }
.cl-result strong { color: var(--cl-green); font-size: 31px; font-weight: 500; line-height: 1.45; font-variant-numeric: tabular-nums; }
.cl-result small { font-size: 16px; font-weight: 400; }
.cl-steps { margin: 24px 0; padding-left: 23px; }
.cl-steps > li { padding-left: 6px; margin: 0 0 21px; }
.cl-steps > li::marker { color: #859575; font-weight: 600; }
.cl-steps strong { font-weight: 550; color: var(--cl-green); font-size: 15px; }
.case-learning .cl-steps p { margin-top: 8px; color: var(--cl-muted); font-size: 14px; }
.case-learning .cl-steps .cl-formula { padding: 11px 14px; background: #edf1e5; color: var(--cl-green); font-size: 14px; font-variant-numeric: tabular-nums; border-radius: 3px; overflow-wrap: anywhere; }
.case-learning .cl-note { margin-top: 20px; border-left: 2px solid #c3ac8e; padding: 10px 0 10px 16px; color: #7a6b54; font-size: 13px; }
.cl-button { display: inline-flex; align-items: center; justify-content: center; gap: 16px; min-height: 44px; border-radius: 4px; border: 1px solid var(--cl-line); padding: 11px 17px; cursor: pointer; text-decoration: none; line-height: 1.5; }
.cl-button-quiet { background: transparent; color: var(--cl-green); font-size: 13px !important; }
.cl-button-quiet:hover { background: #e8eddf; }
.cl-button-primary { background: var(--cl-green); color: #fff; border-color: var(--cl-green); font-size: 14px !important; }
.cl-button-primary:hover { background: #183e34; }
.cl-next { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 35px; align-items: center; margin-top: 46px; padding: 31px; background: #e7eddf; border-radius: 4px; }
.case-learning .cl-next h2 { font-size: 24px; font-weight: 500; line-height: 1.6; margin: 9px 0 14px; }
.cl-next p:not(.cl-kicker) { color: var(--cl-muted); font-size: 14px; }
.cl-next .cl-button { white-space: nowrap; }
.case-learning .cl-source { color: var(--cl-muted); font-size: 12px; margin-top: 25px; overflow-wrap: anywhere; }
@media (max-width: 760px) {
  .cl-topbar { padding: 17px 20px; gap: 14px; flex-wrap: wrap; }
  .cl-brand { gap: 10px; }
  .cl-brand strong { font-size: 16px; }
  .cl-brand span { font-size: 11px; }
  .cl-content { padding: 0 22px 32px; }
  .cl-hero { grid-template-columns: minmax(0, 1fr); gap: 25px; padding: 37px 0 22px; }
  .cl-reading-guide { padding: 20px 23px; }
  .cl-reading-guide ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 3px 22px; }
  .cl-reading-guide li { font-size: 13px; }
  .cl-exercise { padding: 35px 0; }
  .cl-exercise-heading { grid-template-columns: 28px minmax(0, 1fr); gap: 12px; }
  .cl-number { font-size: 16px; }
  .case-learning .cl-exercise h2 { font-size: 23px; }
  .cl-answer summary { padding: 16px; font-size: 13px; }
  .cl-answer-body { padding: 20px 17px; }
  .cl-steps { padding-left: 19px; }
  .cl-steps > li { padding-left: 3px; }
  .cl-result strong { font-size: 29px; }
  .cl-next { grid-template-columns: minmax(0, 1fr); gap: 22px; padding: 24px; margin-top: 32px; }
  .cl-next .cl-button { justify-self: start; }
}
@media (max-width: 420px) {
  .cl-content { padding-right: 17px; padding-left: 17px; }
  .cl-topbar { padding-right: 17px; padding-left: 17px; }
  .cl-brand span { display: none; }
  .cl-topbar .cl-button { padding: 9px 11px; gap: 8px; }
  .cl-reading-guide ol { grid-template-columns: minmax(0, 1fr); }
  .case-learning .cl-question, .cl-lead { font-size: 14px; }
  .cl-answer-body { padding: 18px 14px; }
  .cl-think { padding: 15px 17px; }
}
@media print {
  .cl-topbar, .cl-next .cl-button, .cl-toggle { display: none; }
  .cl-content { max-width: none; padding: 0; }
  .cl-hero { padding-top: 15px; }
  .cl-answer { break-inside: avoid; }
  .cl-table-scroll { overflow: visible; }
  .cl-table-scroll table { min-width: 0; font-size: 10px; }
  .cl-table-scroll th, .cl-table-scroll td { padding: 7px; }
}