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solid var(--sh-border);cursor:pointer;color:var(--sh-text);align-items:center;gap:12px;padding:14px 0;text-decoration:none;transition:background .15s;display:flex}.course-detail-module__QAECra__chapterItem:active{background:#00000005}.course-detail-module__QAECra__chapterIndex{background:var(--sh-bg);width:28px;height:28px;color:var(--sh-text-secondary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:12px;font-weight:600;display:flex}.course-detail-module__QAECra__chapterInfo{flex:1;min-width:0}.course-detail-module__QAECra__chapterTitle{text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:500;overflow:hidden}.course-detail-module__QAECra__chapterMeta{color:var(--sh-text-muted);margin-top:2px;font-size:12px}.course-detail-module__QAECra__chapterFree{color:var(--sh-primary);background:#4ecdc426;}.course-detail-module__QAECra__buyBar{z-index:50;padding:10px 0;padding-bottom:calc(10px + var(--safe-bottom));background:var(--sh-card);border-top:1px solid var(--sh-border);align-items:center;display:flex;position:fixed;bottom:0;left:0;right:0}.course-detail-module__QAECra__buyBarSpacer{height:80px}.course-detail-module__QAECra__buyActions{align-items:center;gap:0;padding:0 4px;display:flex}.course-detail-module__QAECra__actionBtn{width:52px;color:var(--sh-text-secondary);flex-direction:column;justify-content:center;align-items:center;gap:2px;padding:2px 0;font-size:10px;text-decoration:none;transition:color .15s;display:flex}.course-detail-module__QAECra__actionBtn:active{color:var(--sh-primary)}.course-detail-module__QAECra__buyMain{flex:1;justify-content:flex-end;align-items:center;padding-right:12px;display:flex}.course-detail-module__QAECra__buyPriceInfo{display:none}.course-detail-module__QAECra__buyBtn{background:linear-gradient(135deg, var(--sh-primary), var(--sh-primary-end));color:#fff;cursor:pointer;white-space:nowrap;border:none;border-radius:22px;flex:1;justify-content:center;align-items:center;height:44px;font-size:16px;font-weight:600;transition:opacity .2s;display:flex}.course-detail-module__QAECra__buyBtn:active{opacity:.85}.course-detail-module__QAECra__owned{color:var(--sh-primary);border:1.5px solid var(--sh-primary);cursor:default;opacity:.8;background:#4ecdc41a;}.course-detail-module__QAECra__buyPending{color:#d97706;cursor:default;opacity:.8;background:#fbbf241a;border:1.5px solid #fbbf24;}.course-detail-module__QAECra__sidebarCard{background:var(--sh-card);border:1px solid var(--sh-border);border-radius:16px;flex-direction:column;gap:20px;padding:24px;display:flex;box-shadow:0 2px 16px #0000000f}.course-detail-module__QAECra__sidebarPriceBlock{justify-content:space-between;align-items:center;display:flex}.course-detail-module__QAECra__sidebarPrice{align-items:baseline;gap:8px;display:flex}.course-detail-module__QAECra__saveBadge{color:var(--sh-accent);white-space:nowrap;background:#ff6b6b14;border-radius:12px;padding:3px 10px;font-size:12px;font-weight:600}.course-detail-module__QAECra__sidebarOwned{height:48px;color:var(--sh-primary);border:1.5px solid var(--sh-primary);background:#4ecdc41a;border-radius:24px;justify-content:center;align-items:center;font-size:16px;font-weight:600;display:flex}.course-detail-module__QAECra__sidebarPending{color:#d97706;background:#fbbf241a;border-color:#fbbf24;}.course-detail-module__QAECra__sidebarFeatures{border-top:1px solid var(--sh-border);color:var(--sh-text-secondary);flex-direction:column;gap:10px;margin:0;padding:16px 0 0;font-size:13px;list-style:none;display:flex}.course-detail-module__QAECra__sidebarFeatures li{align-items:center;gap:6px;display:flex}.course-detail-module__QAECra__sidebarDescBlock{border-top:1px solid var(--sh-border);padding-top:16px}.course-detail-module__QAECra__sidebarDescLabel{color:var(--sh-text);margin-bottom:8px;font-size:13px;font-weight:600;display:block}.course-detail-module__QAECra__sidebarDesc{color:var(--sh-text-secondary);-webkit-line-clamp:4;-webkit-box-orient:vertical;font-size:13px;line-height:1.6;display:-webkit-box;overflow:hidden}@media (min-width:768px){.course-detail-module__QAECra__backBar{display:none}.course-detail-module__QAECra__detailLayout{align-items:flex-start;gap:32px;display:flex}.course-detail-module__QAECra__mainContent{flex:1;min-width:0}.course-detail-module__QAECra__sidebar{flex-shrink:0;width:320px;display:block;position:sticky;top:24px}.course-detail-module__QAECra__coverWrapper{border-radius:16px;max-height:360px;overflow:hidden}.course-detail-module__QAECra__infoSection{padding:24px 16px}.course-detail-module__QAECra__courseTitle{font-size:22px}.course-detail-module__QAECra__tabContent{padding:24px 16px}.course-detail-module__QAECra__chapterItem:hover{background:#4ecdc40a}.course-detail-module__QAECra__buyBar,.course-detail-module__QAECra__buyBarSpacer{display:none}.course-detail-module__QAECra__sidebarCard .course-detail-module__QAECra__buyBtn{border-radius:26px;flex:none;width:100%;height:52px;font-size:17px}}