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h1{margin:0;font-size:1.5rem;font-weight:600;color:#333}.course-content{display:flex;flex-direction:column;align-items:stretch;gap:20px;padding:20px;width:100%;flex:1;min-height:0;max-width:1400px;margin:0 auto}.video-section{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 8px #0000001a;min-height:500px;max-height:80vh;display:flex;flex-direction:column;width:100%}.no-lesson-selected{display:flex;align-items:center;justify-content:center;flex:1;min-height:300px;color:#666;font-size:1.1rem;text-align:center;padding:20px}.youtube-placeholder{width:100%;height:100%;min-height:300px;background:#000;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.2rem;position:relative}.youtube-placeholder:before{content:"▶";font-size:4rem;opacity:.7}.course-sidebar{background:#fff;border-radius:8px;box-shadow:0 2px 8px 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