:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-card: #1a1a24;--bg-hover: #242430;--text-primary: #ffffff;--text-secondary: #a0a0b0;--accent: #6366f1;--accent-hover: #818cf8;--success: #22c55e;--border: rgba(255, 255, 255, .1);--gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);--gradient-2: linear-gradient(135deg, #22c55e 0%, #10b981 100%);--shadow-lg: 0 20px 40px rgba(0, 0, 0, .4)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.app-container{min-height:100vh;display:flex;flex-direction:column}.header{background:var(--bg-secondary);border-bottom:1px solid var(--border);padding:1rem 2rem;display:flex;align-items:center;gap:1rem;position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-logo{font-size:1.5rem;font-weight:700;background:var(--gradient-1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header-nav{display:flex;gap:.5rem;margin-left:auto}.nav-link{padding:.5rem 1rem;border-radius:8px;font-size:.875rem;color:var(--text-secondary);transition:all .2s}.nav-link:hover,.nav-link.active{color:var(--text-primary);background:var(--bg-hover)}.main-content{flex:1;padding:2rem;max-width:1400px;margin:0 auto;width:100%}.hero{text-align:center;padding:3rem 0;margin-bottom:2rem}.hero-title{font-size:3rem;font-weight:800;margin-bottom:1rem;background:var(--gradient-1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto}.hero-stats{display:flex;justify-content:center;gap:3rem;margin-top:2rem}.stat-item{text-align:center}.stat-value{font-size:2.5rem;font-weight:700;color:var(--accent)}.stat-label{font-size:.875rem;color:var(--text-secondary)}.levels-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:1rem}.level-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:1.5rem;text-align:center;cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}.level-card:before{content:"";position:absolute;inset:0;background:var(--gradient-1);opacity:0;transition:opacity .3s}.level-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--accent)}.level-card:hover:before{opacity:.1}.level-card-content{position:relative;z-index:1}.level-name{font-size:2rem;font-weight:700;margin-bottom:.25rem}.level-count{font-size:.875rem;color:var(--text-secondary)}.page-header{display:flex;align-items:center;gap:1rem;margin-bottom:2rem}.back-button{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:.75rem 1rem;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;gap:.5rem;transition:all .2s}.back-button:hover{background:var(--bg-hover);border-color:var(--accent)}.page-title{font-size:2rem;font-weight:700}.books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}.book-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:1.25rem;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;gap:1rem}.book-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--accent)}.book-number{font-size:1.5rem;font-weight:700;color:var(--accent);min-width:50px}.book-info{flex:1;min-width:0}.book-title{font-size:1rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.book-meta{font-size:.75rem;color:var(--text-secondary);margin-top:.25rem}.book-icons{display:flex;gap:.5rem;color:var(--text-secondary)}.reader-container{display:flex;flex-direction:column;height:calc(100vh - 10px);gap:.25rem;padding:.25rem}.reader-header{display:flex;align-items:center;gap:1rem;padding:0 .5rem;min-height:48px}.reader-title{flex:1;font-size:1rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pdf-container{flex:1;background:var(--bg-secondary);border-radius:12px;overflow:hidden;display:flex;flex-direction:column;min-height:0}.pdf-viewer{flex:1;overflow:hidden;display:flex;justify-content:center;align-items:center;padding:4px;background:#1e1e2e}.pdf-controls{display:flex;align-items:center;justify-content:center;gap:1rem;padding:1rem;background:var(--bg-card);border-top:1px solid var(--border)}.pdf-control-btn{background:var(--bg-hover);border:1px solid var(--border);border-radius:8px;padding:.5rem 1rem;color:var(--text-primary);cursor:pointer;transition:all .2s}.pdf-control-btn:hover:not(:disabled){background:var(--accent);border-color:var(--accent)}.pdf-control-btn:disabled{opacity:.5;cursor:not-allowed}.page-info{font-size:.875rem;color:var(--text-secondary);min-width:100px;text-align:center}.audio-player{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:1rem 1.5rem;display:flex;align-items:center;gap:1rem}.play-button{width:48px;height:48px;border-radius:50%;background:var(--gradient-1);border:none;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.25rem;transition:transform .2s,box-shadow .2s;flex-shrink:0}.play-button:hover{transform:scale(1.05);box-shadow:0 0 20px #6366f180}.audio-progress{flex:1;display:flex;flex-direction:column;gap:.5rem}.progress-bar{width:100%;height:6px;background:var(--bg-hover);border-radius:3px;cursor:pointer;overflow:hidden}.progress-fill{height:100%;background:var(--gradient-1);border-radius:3px;transition:width .1s}.time-display{display:flex;justify-content:space-between;font-size:.75rem;color:var(--text-secondary)}.volume-control{display:flex;align-items:center;gap:.5rem;color:var(--text-secondary)}.volume-slider{width:80px;height:4px;-webkit-appearance:none;appearance:none;background:var(--bg-hover);border-radius:2px;cursor:pointer}.volume-slider::-webkit-slider-thumb{-webkit-appearance:none;width:12px;height:12px;border-radius:50%;background:var(--accent);cursor:pointer}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem;gap:1rem}.spinner{width:48px;height:48px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error-message{background:#ef44441a;border:1px solid rgba(239,68,68,.3);border-radius:12px;padding:1rem 1.5rem;color:#ef4444;text-align:center}@media(max-width:768px){.header,.main-content{padding:1rem}.hero-title{font-size:2rem}.hero-stats{gap:1.5rem}.stat-value{font-size:1.75rem}.levels-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr))}.books-grid{grid-template-columns:1fr}.audio-player{flex-wrap:wrap}.volume-control{display:none}}