.course-page{min-height:100vh}.error-state,.loading-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;min-height:400px;color:var(--text-secondary)}.spinner{width:36px;height:36px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.course-hero{position:relative;padding:48px 24px 56px;border-bottom:1px solid var(--border);overflow:hidden}.course-hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse at 60% 50%,color-mix(in srgb,var(--tag-color) 6%,transparent) 0,transparent 70%);pointer-events:none}.course-hero-inner{max-width:1280px;margin:0 auto;position:relative}.breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:24px}.btn-breadcrumb{font-size:13px;font-family:var(--font-mono);color:var(--text-secondary);padding:6px 12px;border-radius:6px;border:1px solid var(--border);background:var(--bg-card);transition:all .2s}.btn-breadcrumb:hover{color:var(--text-primary);border-color:var(--text-muted)}.bc-sep{color:var(--text-muted)}.bc-tag{font-size:11px;font-family:var(--font-mono);font-weight:700;letter-spacing:.1em}.course-hero-grid{display:grid;grid-template-columns:1fr 340px;grid-gap:48px;gap:48px;align-items:start}.badge-bs{display:inline-flex;align-items:center;gap:4px;background:rgba(245,158,11,.15);color:#f59e0b;border:1px solid rgba(245,158,11,.3);font-size:11px;font-weight:700;font-family:var(--font-mono);padding:3px 10px;border-radius:4px;margin-bottom:12px}.course-title{font-family:var(--font-display);font-size:clamp(22px,3vw,36px);font-weight:800;color:var(--text-primary);line-height:1.2;margin-bottom:16px}.course-headline{font-size:15px;color:var(--text-secondary);line-height:1.7;margin-bottom:20px;max-width:600px}.course-meta-row{gap:8px;flex-wrap:wrap;margin-bottom:10px}.course-meta-row,.star-row{display:flex;align-items:center}.star-row{gap:2px}.star{font-size:14px;color:var(--text-muted)}.rating-val,.star.filled{color:#f59e0b}.rating-val{font-family:var(--font-mono);font-size:13px;font-weight:700;margin-left:4px}.meta-sep{color:var(--border)}.meta-text{font-size:13px;color:var(--text-secondary)}.meta-label{font-size:12px;color:var(--text-muted)}.meta-val{font-size:13px;font-weight:600;color:var(--text-secondary)}.enroll-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;position:-webkit-sticky;position:sticky;top:80px;box-shadow:var(--shadow-card)}.enroll-image-wrap{aspect-ratio:16/9;overflow:hidden}.enroll-image{width:100%;height:100%;object-fit:cover}.enroll-body{padding:20px;display:flex;flex-direction:column;gap:14px}.enroll-price{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}.price-big{font-family:var(--font-mono);font-size:26px;font-weight:700;color:var(--text-primary)}.price-orig{font-size:14px;color:var(--text-muted);text-decoration:line-through}.discount-badge{font-size:11px;font-family:var(--font-mono);background:var(--accent);padding:2px 7px;border-radius:4px}.btn-enroll,.discount-badge{font-weight:700;color:#0d0f14}.btn-enroll{display:block;text-align:center;padding:14px;border-radius:10px;font-size:15px;font-family:var(--font-display);transition:opacity .2s,transform .2s}.btn-enroll:hover{opacity:.9;transform:translateY(-1px)}.enroll-meta{display:flex;flex-direction:column;gap:6px;padding-top:4px}.enroll-meta span{font-size:12px;color:var(--text-muted)}.course-content{padding:48px 24px 80px}.course-content-inner{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:48px}.section-title{font-family:var(--font-display);font-size:20px;font-weight:700;color:var(--text-primary);margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid var(--border)}.topics-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));grid-gap:10px;gap:10px}.topic-item{display:flex;align-items:center;gap:8px;padding:10px 14px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;font-size:13px;color:var(--text-secondary);transition:border-color .2s,color .2s}.topic-item:hover{border-color:var(--tag-color);color:var(--text-primary)}.topic-check{color:var(--tag-color);font-weight:700}.description{display:flex;flex-direction:column;gap:16px}.description p{font-size:15px;color:var(--text-secondary);line-height:1.8}.stats-strip{justify-content:space-around;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;flex-wrap:wrap;gap:20px}.stat-item,.stats-strip{display:flex;align-items:center}.stat-item{flex-direction:column;gap:4px}.stat-big{font-family:var(--font-mono);font-size:24px;font-weight:700}.stat-small{font-size:11px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em}.stat-divider{width:1px;height:40px;background:var(--border)}.cta-section{display:flex;flex-direction:column;align-items:center;gap:16px;padding:40px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);text-align:center}.cta-text{font-size:18px;font-weight:600;color:var(--text-primary)}.btn-enroll-lg,.cta-text{font-family:var(--font-display)}.btn-enroll-lg{padding:14px 40px;border-radius:10px;font-size:16px;font-weight:700;color:#0d0f14;background:var(--tag-color);transition:opacity .2s,transform .2s;box-shadow:0 0 20px color-mix(in srgb,var(--tag-color) 30%,transparent)}.btn-enroll-lg:hover{opacity:.9;transform:translateY(-2px)}.btn-back{font-size:13px;font-family:var(--font-mono);color:var(--text-muted);transition:color .2s}.btn-back-main,.btn-back:hover{color:var(--text-primary)}.btn-back-main{padding:10px 20px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;font-size:13px;font-family:var(--font-mono);transition:all .2s}.btn-back-main:hover{border-color:var(--accent);color:var(--accent)}@media (max-width:900px){.course-hero-grid{grid-template-columns:1fr}.enroll-card{position:static}}@media (max-width:640px){.course-hero{padding:32px 16px 40px}.stats-strip{gap:24px}.stat-divider{display:none}}