.course-detail-page{max-width:1200px;margin:0 auto;padding:24px 20px 40px}.breadcrumb{color:var(--text-muted);align-items:center;gap:6px;margin-bottom:20px;font-size:.75rem;display:flex}.breadcrumb a{color:var(--text-muted);text-decoration:none;transition:color .2s}.breadcrumb a:hover{color:var(--primary)}.breadcrumb-separator{width:12px;height:12px}.breadcrumb-current{color:var(--text-main)}.course-detail-layout{grid-template-columns:1fr 320px;align-items:flex-start;gap:24px;display:grid}.course-main{min-width:0}.course-header{border:1px solid var(--border);background:#fff;border-radius:12px;margin-bottom:20px;overflow:hidden}.course-image-large{justify-content:center;align-items:center;height:200px;display:flex;position:relative}.course-tag-large{color:#fff;border-radius:20px;padding:4px 12px;font-size:.75rem;font-weight:600;position:absolute;top:12px;left:12px}.course-header-info{padding:20px}.course-title-large{color:var(--text-main);margin-bottom:8px;font-size:1.5rem;font-weight:700}.course-subtitle{color:var(--text-muted);margin-bottom:16px;font-size:.9375rem}.course-stats-large{flex-wrap:wrap;gap:20px;display:flex}.course-stats-large span{color:var(--text-body);align-items:center;gap:6px;font-size:.875rem;display:flex}.course-section{border:1px solid var(--border);background:#fff;border-radius:12px;margin-bottom:20px;padding:20px}.section-title{color:var(--text-main);margin-bottom:16px;font-size:1.125rem;font-weight:600}.course-description{color:var(--text-body);font-size:.875rem;line-height:1.7}.course-outline{flex-direction:column;gap:8px;display:flex}.outline-item{border:1px solid var(--border);border-radius:8px;overflow:hidden}.outline-header{cursor:pointer;align-items:center;gap:12px;padding:14px 16px;transition:background .2s;display:flex}.outline-header:hover{background:var(--bg-secondary)}.outline-icon{flex-shrink:0;width:18px;height:18px}.outline-icon.free{color:var(--success)}.outline-icon.locked{color:var(--text-muted)}.outline-title{color:var(--text-main);flex:1;font-size:.875rem}.free-badge{background:var(--success);color:#fff;border-radius:4px;padding:2px 8px;font-size:.7rem}.course-sidebar{position:sticky;top:80px}.course-buy-card{border:1px solid var(--border);background:#fff;border-radius:12px;padding:20px}.course-price-large{align-items:baseline;gap:12px;margin-bottom:16px;display:flex}.price-current{color:var(--danger);font-size:2rem;font-weight:700}.price-original{color:var(--text-muted);font-size:1rem;text-decoration:line-through}.price-free{color:var(--success);font-size:2rem;font-weight:700}.buy-button{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;width:100%;margin-bottom:12px;padding:14px;font-size:1rem;font-weight:600;transition:background .2s}.buy-button:hover{background:var(--primary-hover)}.member-tip{text-align:center;color:var(--text-muted);margin-bottom:20px;font-size:.8125rem}.course-includes{border-top:1px solid var(--border);margin-bottom:20px;padding-top:16px}.course-includes h4{color:var(--text-main);margin-bottom:12px;font-size:.875rem;font-weight:600}.course-includes ul{margin:0;padding:0;list-style:none}.course-includes li{color:var(--text-body);align-items:center;gap:8px;margin-bottom:10px;font-size:.8125rem;display:flex}.course-includes li svg{color:var(--success);flex-shrink:0}.course-instructor{border-top:1px solid var(--border);padding-top:16px}.course-instructor h4{color:var(--text-main);margin-bottom:12px;font-size:.875rem;font-weight:600}.instructor-info{align-items:center;gap:10px;display:flex}.instructor-avatar{color:#fff;background:linear-gradient(135deg,#6366f1 0%,#8b5cf6 100%);border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;font-size:1rem;font-weight:600;display:flex}.instructor-info span{color:var(--text-main);font-size:.875rem}@media (max-width:900px){.course-detail-layout{grid-template-columns:1fr}.course-sidebar{order:-1;position:static}.course-image-large{height:160px}.course-title-large{font-size:1.25rem}}