.case-page { padding-top: 28px; }
.breadcrumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; font-size: 11px; color: var(--muted); }
.breadcrumbs a:hover { color: var(--green); text-decoration: underline; }
.breadcrumbs span[aria-current] { color: var(--ink); }
.case-heading { display: flex; justify-content: space-between; gap: 30px; align-items: start; padding-block: 39px 33px; }
.case-heading h1 { font-size: 38px; font-weight: 600; line-height: 1.5; margin-block: 11px 13px; letter-spacing: -.6px; }
.case-heading > div > p:last-child { font-size: 13px; color: var(--muted); max-width: 680px; line-height: 1.9; }
.case-heading > .status { margin-top: 38px; padding: 5px 12px; font-size: 11px; }
.case-layout { display: grid; grid-template-columns: 1fr 315px; gap: 27px; }
.experiment-shell { background: white; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.experiment-toolbar { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--line); padding: 15px 22px; background: #fafbf8; font: 10px var(--mono); color: var(--muted); letter-spacing: 1px; }
.experiment-toolbar span:last-child { font: 10px var(--sans); letter-spacing: 0; }
.experiment-placeholder { text-align: center; padding: 38px 24px 40px; flex: 1; background-image: radial-gradient(#d9e1d1 .7px, transparent .7px); background-size: 17px 17px; }
.placeholder-diagram { max-width: 240px; margin: 0 auto 24px; }
.placeholder-diagram svg { display: block; width: 100%; height: auto; }
.placeholder-kicker { font: 9px var(--mono); letter-spacing: 1.5px; color: #7a8c70; margin-bottom: 10px; }
.experiment-placeholder h2 { font-family: var(--serif); font-size: 27px; font-weight: 600; margin-bottom: 13px; }
.experiment-placeholder h2 + p { font-size: 12px; line-height: 1.9; color: var(--muted); }
.experiment-placeholder .button { background: var(--paper); margin-top: 24px; font-size: 11px; min-height: 38px; }
.experiment-placeholder .button:hover { background: var(--green-soft); }
.focus-question { padding: 18px 24px; background: #edf2e8; border-top: 1px solid var(--line); }
.focus-question > span { font-size: 10px; color: var(--muted); }
.focus-question p { color: var(--green); font-size: 13px; margin-top: 4px; }
.learning-panel { border: 1px solid var(--line); border-radius: var(--radius); padding: 25px; background: white; }
.learning-panel h2, .prerequisite-panel h2 { font-size: 17px; font-weight: 600; }
.goal-list { list-style: none; counter-reset: goals; margin: 23px 0 0; padding: 0; display: grid; gap: 21px; }
.goal-list li { display: flex; align-items: baseline; gap: 12px; font-size: 12px; color: var(--muted); }
.goal-list li::before { counter-increment: goals; content: counter(goals, decimal-leading-zero); color: var(--green); font: 10px var(--mono); }
.prerequisite-panel { padding: 23px 25px 8px; }
.prerequisite-panel h2 { font-size: 13px; }
.prerequisite-panel ul { padding-left: 17px; color: var(--muted); font-size: 11px; line-height: 2.2; margin-top: 10px; }
.case-outline { padding-top: 48px; }
.case-outline .section-heading h2 { font-size: 23px; }
.outline-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.outline-card { border: 1px solid var(--line); border-radius: 10px; padding: 24px; }
.outline-card > span { font: 11px var(--mono); color: #859779; }
.outline-card h3 { font-size: 15px; font-weight: 600; margin: 12px 0 8px; }
.outline-card p { font-size: 12px; color: var(--muted); line-height: 1.85; }
.knowledge-points { margin-top: 28px; display: flex; align-items: baseline; gap: 23px; font-size: 11px; color: var(--muted); }
.knowledge-points > span { white-space: nowrap; }
.knowledge-points > div { display: flex; gap: 7px; flex-wrap: wrap; }
.knowledge-points > div > span { border: 1px solid var(--line); border-radius: 4px; padding: 2px 9px; background: white; }
.case-pagination { margin-block: 43px 35px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 25px; }
.case-pagination a { font-size: 12px; color: var(--green); }
.case-pagination a:hover { text-decoration: underline; }
@media (max-width: 950px) { .case-layout { grid-template-columns: 1fr 270px; gap: 20px; } .learning-panel { padding: 22px; } }
@media (max-width: 700px) {
  .case-heading h1 { font-size: 30px; } .case-layout { grid-template-columns: 1fr; } .learning-sidebar { display: grid; grid-template-columns: 1.4fr 1fr; gap: 10px; } .prerequisite-panel { padding-inline: 16px; }
  .outline-grid { grid-template-columns: 1fr; gap: 12px; } .outline-card { padding: 19px 23px; } .outline-card h3 { margin-top: 6px; }
}
@media (max-width: 480px) {
  .case-page { padding-top: 21px; } .breadcrumbs { font-size: 10px; gap: 6px; } .case-heading { flex-wrap: wrap; gap: 15px; padding-block: 30px 25px; }
  .case-heading h1 { font-size: 29px; margin-block: 10px; } .case-heading .eyebrow { font-size: 7px; letter-spacing: .8px; } .case-heading > .status { margin-top: 0; }
  .experiment-toolbar { padding-inline: 17px; font-size: 8px; } .experiment-placeholder { padding: 27px 14px 32px; } .experiment-placeholder h2 { font-size: 23px; } .experiment-placeholder h2 + p { font-size: 11px; }
  .focus-question { padding: 16px 19px; } .focus-question p { font-size: 12px; } .learning-sidebar { grid-template-columns: 1fr; } .prerequisite-panel { padding-top: 10px; padding-bottom: 0; }
  .case-outline { padding-top: 32px; } .knowledge-points { flex-direction: column; gap: 10px; } .case-pagination { font-size: 11px; gap: 16px; } .case-pagination a { font-size: 11px; }
}