.ic-detail{max-width:1920px;margin:auto;padding:24px clamp(20px,12vw,300px) 70px;color:#333}.ic-detail-crumb{display:flex;gap:14px;align-items:center;min-width:0;font-size:13px;color:#909399;margin-bottom:20px}.ic-detail-crumb>span:last-child{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.ic-detail-crumb a{color:#606266}.ic-detail-summary{display:grid;grid-template-columns:44% 1fr;gap:30px;background:#fff;padding:30px;border-radius:8px;margin-bottom:20px}.ic-detail-cover{position:relative;align-self:start}.ic-detail-cover img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:4px}.ic-detail-cover>span{position:absolute;bottom:10px;left:10px;color:#fff;background:#0008;padding:4px 10px;font-size:12px;border-radius:4px}.ic-detail-info{min-width:0}.ic-detail-info h1{margin:8px 0 18px;font-size:23px;line-height:1.5;font-weight:600}.ic-detail-source{color:#909399;font-size:13px;margin:0}.ic-detail-meta{display:flex;gap:10px 20px;flex-wrap:wrap;color:#606266;font-size:13px;line-height:1.8}.ic-detail-intro{padding:12px 15px;background:#f2f8ff;margin:16px 0;border-radius:6px;font-size:13px;line-height:1.9;color:#606266}.ic-detail-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.ic-detail-actions form{margin:0}.ic-join{display:inline-flex;align-items:center;justify-content:center;color:#fff!important;background:linear-gradient(270deg,#0088ff,#40bfff);border:0;border-radius:24px;min-height:44px;min-width:146px;padding:11px 24px;font-size:15px;cursor:pointer}.ic-join:hover{background:#0083f6;text-decoration:none}.ic-detail-access{color:#909399;font-size:12px}.ic-detail-grid{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:20px}.ic-detail-panel{background:#fff;border-radius:8px;margin-bottom:20px;overflow:hidden;scroll-margin-top:90px}.ic-detail-tabs{display:flex;gap:32px;padding:18px 30px;border-bottom:1px solid #eef0f4;font-size:16px}.ic-detail-tabs a{color:#333}.ic-detail-tabs a:first-child{color:#0083f6}.ic-detail-panel-body{padding:24px 30px}.ic-detail-panel h2{font-size:18px;font-weight:600;margin:0 0 18px}.ic-detail-panel p{color:#606266;font-size:14px;line-height:1.9}.ic-detail-panel-heading{display:flex;justify-content:space-between;align-items:center;padding:24px 30px 0}.ic-detail-panel-heading>span{color:#909399;font-size:12px}.ic-rich-text{line-height:1.9;font-size:14px;color:#606266;overflow-wrap:anywhere}.ic-rich-text img{max-width:100%;height:auto}.ic-lesson-list{list-style:none;padding:0 30px 18px;margin:0}.ic-lesson-list li{display:flex;align-items:center;gap:12px;padding:18px 0;border-bottom:1px solid #f0f1f4;font-size:13px}.ic-lesson-index{color:#a6b2c0;font-variant-numeric:tabular-nums}.ic-lesson-title{flex:1;min-width:0;overflow-wrap:anywhere}.ic-lesson-time{color:#909399;white-space:nowrap;font-size:12px}.ic-lesson-list a,.ic-detail-text-link{color:#0083f6;white-space:nowrap}.ic-teacher{display:flex;align-items:center;gap:12px}.ic-teacher img{width:48px;height:48px;border-radius:50%;object-fit:cover}.ic-teacher p{font-size:12px;margin:4px 0}.ic-detail-grid aside .ic-detail-panel-body{padding:24px}
@media(max-width:1000px){.ic-detail{padding-right:24px;padding-left:24px}.ic-detail-grid{grid-template-columns:minmax(0,1fr) 220px}.ic-detail-summary{gap:22px;padding:24px}.ic-detail-info h1{font-size:20px}}
@media(max-width:768px){.ic-detail{padding:18px 16px 40px}.ic-detail-crumb{gap:8px;font-size:12px}.ic-detail-summary{display:block;padding:18px}.ic-detail-cover{margin-bottom:20px}.ic-detail-info h1{font-size:20px}.ic-detail-grid{display:block}.ic-detail-tabs{padding:16px 20px;gap:22px;font-size:14px}.ic-detail-panel-body{padding:20px}.ic-detail-panel-heading{padding:20px 20px 0}.ic-lesson-list{padding:0 20px 18px}.ic-lesson-time{display:none}.ic-detail-grid aside{display:grid;gap:16px;grid-template-columns:1fr}.ic-detail-panel{scroll-margin-top:70px}}

/* Keep detail content within its column and avoid a gutter jump at 1000px. */
.ic-detail-info h1,.ic-detail-intro,.ic-teacher>div{overflow-wrap:anywhere;min-width:0}
.ic-detail-crumb>a{flex:none}
.ic-rich-text iframe,.ic-rich-text video{max-width:100%}
.ic-rich-text table{display:block;max-width:100%;overflow-x:auto}
.ic-rich-text pre{max-width:100%;overflow-x:auto}
.ic-detail-tabs{overflow-x:auto;overscroll-behavior-x:contain}
.ic-detail-tabs a{flex:none;white-space:nowrap;min-height:32px;display:flex;align-items:center}
@media(min-width:1001px) and (max-width:1200px){.ic-detail{padding-left:32px;padding-right:32px}}
@media(max-width:480px){.ic-detail-summary{padding:16px}.ic-detail-panel-body{padding:18px}.ic-detail-tabs{padding:12px 16px;gap:20px}.ic-detail-actions .ic-join{width:100%}.ic-detail-actions>a{width:100%}.ic-lesson-list{padding-left:18px;padding-right:18px}.ic-lesson-list a{min-height:40px;display:flex;align-items:center}}

/* Compact course presentation retains readable paragraphs and actions. */
.ic-detail{max-width:1248px;padding:20px 24px 36px}
.ic-detail-summary{gap:24px;padding:24px;margin-bottom:16px}
.ic-detail-panel{margin-bottom:16px}
.ic-detail-grid{gap:16px}
.ic-detail-panel-body{padding:20px 24px}
.ic-detail-panel-heading{padding:20px 24px 0}
.ic-detail-tabs{padding:12px 24px}
@media(max-width:768px){.ic-detail{padding:16px 16px 28px}.ic-detail-summary{padding:16px}.ic-detail-panel-body{padding:18px}.ic-detail-panel-heading{padding:18px 18px 0}.ic-detail-tabs{padding:10px 16px}}