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rgba(0,0,0,.3)}.book-info{padding:1.5rem;flex:1;display:flex;flex-direction:column}.book-info h3{font-size:1.3rem;margin-bottom:.5rem;color:var(--text-color);line-height:1.3}.book-author{font-size:.95rem;color:var(--primary);font-weight:600;margin-bottom:.75rem}.book-summary{font-size:.95rem;color:var(--text-secondary);line-height:1.6;flex:1}@media(max-width:768px){.books-grid{grid-template-columns:1fr}.lang-tabs{gap:.5rem}.lang-tab{padding:10px 16px;font-size:.9rem}.section-header h1{font-size:2rem}.lang-content h2{font-size:1.5rem}}.quest-nav-container{display:flex;justify-content:center;align-items:center;overflow-x:auto;padding:20px 0}.quest-progress-bar{display:flex;align-items:center;gap:10px}.quest-node{width:40px;height:40px;border-radius:50%;background:var(--card-bg);border:3px solid var(--border-color);display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--text-secondary);position:relative;transition:all .3s ease;flex-shrink:0}.quest-node.completed{background:var(--success);border-color:var(--success);color:#fff}.quest-node.active{border-color:var(--primary);color:var(--primary);box-shadow:0 0 10px #1976d24d;transform:scale(1.1)}.quest-node.locked{background:#f0f0f0;color:#aaa;cursor:not-allowed}.quest-node-stars{position:absolute;top:-20px;font-size:.8rem;white-space:nowrap}.quest-line{height:4px;width:30px;background:var(--border-color);transition:all .3s ease;flex-shrink:0}.quest-line.completed{background:var(--success)}.quest-workspace{display:flex;flex-direction:column;gap:2rem}@media(min-width:1024px){.quest-workspace{flex-direction:row}.quest-canvas-container{flex:2}.quest-sidebar{flex:1}}.quest-modal{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#0009;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);display:flex;align-items:center;justify-content:center;z-index:1000}.quest-modal-content{background:var(--card-bg);padding:3rem;border-radius:20px;text-align:center;box-shadow:0 10px 40px #0003;max-width:500px;width:90%;animation:slideFadeIn .5s ease forwards}.modal-star{font-size:3rem;margin:0 5px;display:inline-block;opacity:0;transform:scale(.5);animation:popIn .5s cubic-bezier(.175,.885,.32,1.275) forwards}.modal-star.empty{filter:grayscale(100%) opacity(.3)}@keyframes popIn{to{opacity:1;transform:scale(1)}}.confetti{position:absolute;width:10px;height:10px;border-radius:2px;animation:fall linear forwards}@keyframes fall{0%{transform:translateY(-50vh) rotate(0);opacity:1}to{transform:translateY(100vh) rotate(720deg);opacity:0}}