.course-container{max-width:var(--max-width);margin:0 auto;padding:32px 20px 80px;color:#222;line-height:1.7}.course-section-badge{display:inline-block;background:#0077cc;color:#fff;font-size:13px;font-weight:600;padding:5px 14px;border-radius:20px;margin-bottom:28px}.course-content{margin-bottom:40px}.course-card{border-radius:12px;padding:28px 32px;margin-bottom:24px;box-shadow:0 4px 12px rgba(0,0,0,.06)}.course-card h1,.course-card h2,.course-card h3{color:#1a1a1a;margin-top:1.4em}.course-card h1{font-size:26px}.course-card h2{font-size:22px;border-bottom:2px solid #eee;padding-bottom:6px;border-left:4px solid #0077cc;padding-left:10px}.course-card h3{font-size:18px}.course-card h1:first-child,.course-card h2:first-child,.course-card h3:first-child{margin-top:0}.course-card p{margin:14px 0;font-size:15px}.course-card ol,.course-card ul{padding-left:22px}.course-card li{margin:7px 0;font-size:15px}.course-card strong{color:#000}.course-card a{color:#0077cc;text-decoration:none}.course-card a:hover{text-decoration:underline}.course-card code{background:#f4f4f4;padding:2px 6px;border-radius:4px;font-size:13px}.course-card pre{background:#f4f4f4;padding:16px;border-radius:8px;overflow-x:auto}.course-card pre code{background:none;padding:0}.course-card table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}.course-card td,.course-card th{border:1px solid #ddd;padding:10px 12px;text-align:left}.course-card th{background:#f0f0f0;font-weight:600}.course-card blockquote{border-left:4px solid #0077cc;margin:16px 0;padding:10px 16px;background:#f0f7ff;color:#444;border-radius:0 6px 6px 0}.course-nav{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px 0 8px;border-top:2px solid #eee;flex-wrap:wrap}.course-nav-btn{padding:10px 20px;border-radius:8px;border:none;font-size:14px;font-weight:600;cursor:pointer;transition:background .18s,opacity .18s;max-width:260px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.course-nav-btn:disabled{opacity:.4;cursor:not-allowed}.course-nav-next,.course-nav-prev{background:#f0f0f0;color:#333}.course-nav-finish{background:#0077cc;color:#fff;flex-shrink:0}