.spinner-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem}.spinner{width:40px;height:40px;border:4px solid var(--glass-border);border-top:4px solid var(--accent-primary);border-radius:50%;animation:spin 1s linear infinite;box-shadow:var(--glow-purple)}.spinner-text{margin-top:1rem;color:var(--text-secondary);font-weight:500;animation:pulse 2s infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.navbar{position:fixed;top:0;left:0;width:100%;z-index:1000;border-radius:0;border-top:none;border-left:none;border-right:none;padding:.75rem 2rem}.navbar-container{max-width:1200px;margin:0 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.75rem;border-radius:8px;color:var(--text-primary);font-size:.9rem;background:transparent;border:none;cursor:pointer;text-align:left;transition:background .15s ease}.dropdown-item:hover{background:#ffffff0f}.dropdown-item.admin{color:#fbbf24}.dropdown-item.logout{color:#f87171}.dropdown-item.logout:hover{background:#f8717114}.landing-page{min-height:100vh;padding-top:80px;overflow-x:hidden;background:radial-gradient(circle at top right,var(--bg-tertiary),var(--bg-primary))}.fade-in-section{opacity:0;transform:translateY(20vh);visibility:hidden;transition:opacity 1.2s ease-out,transform 1.2s 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.node-title{opacity:.5}.xp-popup-container{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none;z-index:9999}.xp-popup-content{font-size:2.5rem;font-weight:900;color:var(--warning);text-shadow:0 0 20px rgba(245,158,11,.8);animation:xpFloatUp 2s cubic-bezier(.25,1,.5,1) forwards}@keyframes xpFloatUp{0%{opacity:0;transform:translateY(20px) scale(.8)}20%{opacity:1;transform:translateY(0) scale(1.2)}80%{opacity:1;transform:translateY(-50px) scale(1)}to{opacity:0;transform:translateY(-80px) scale(.9)}}.lesson-page{min-height:100vh;padding-top:100px;background:var(--bg-primary)}.lesson-container{max-width:800px;margin:0 auto;padding:0 1.5rem}.lesson-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.lesson-type-badge{background:#7c3aed33;color:var(--accent-secondary);padding:.25rem 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