:root{--primary-color:#4361ee;--secondary-color:#3a0ca3;--accent-color:#f72585;--light-bg:#f8f9fa;--dark-bg:#212529;--card-shadow:0 8px 30px rgba(0,0,0,0.08);--hover-shadow:0 12px 40px rgba(0,0,0,0.12)}.toc-card{position:sticky;top:20px;max-height:85vh;overflow-y:auto;scrollbar-width:thin;border:none!important;transition:all 0.3s ease}.toc-card:hover{transform:translateY(-2px);box-shadow:var(--hover-shadow)!important}.toc-card::-webkit-scrollbar{width:4px}.toc-card::-webkit-scrollbar-thumb{background:var(--primary-color);border-radius:4px}.toc-header{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;padding:1rem;border-radius:8px 8px 0 0!important;margin:-1rem -1rem 1rem -1rem}.chapter-title{color:var(--secondary-color)!important;font-weight:600;padding:0.5rem 0;border-bottom:2px solid #e9ecef;margin-bottom:0.5rem;transition:all 0.3s ease}.chapter-title:hover{color:var(--accent-color)!important;transform:translateX(5px)}.page-item{position:relative;padding:0.4rem 0 0.4rem 1.2rem;margin:0.2rem 0;border-radius:6px;transition:all 0.2s ease}.page-item:hover{background-color:rgba(67,97,238,0.05);transform:translateX(3px)}.page-item.active{background-color:rgba(67,97,238,0.1);border-left:3px solid var(--accent-color)}.page-item::before{position:absolute;left:0;font-size:0.9em}.content-card{border:none;box-shadow:var(--card-shadow);border-radius:12px;padding:2rem;background:white;margin-bottom:2rem}.page-header{position:relative;padding-bottom:1rem;margin-bottom:2rem}.page-header::after{content:'';position:absolute;bottom:0;left:0;width:100%;height:3px;background:linear-gradient(90deg,var(--primary-color),var(--accent-color));border-radius:3px}.page-content{line-height:1.8;font-size:1.1rem;color:#2d3748}.page-content h2{color:var(--secondary-color);margin-top:2rem;padding-bottom:0.5rem;border-bottom:2px solid #e9ecef}.page-content h3{color:#4a5568;margin-top:1.5rem}.page-content p{margin-bottom:1.5rem;text-align:justify}.page-content img{max-width:100%!important;height:auto!important;display:block;margin:1.5rem auto!important;border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,0.1)}.page-content blockquote{border-left:4px solid var(--primary-color);padding-left:1.5rem;margin:1.5rem 0;color:#4a5568;font-style:italic;background:rgba(67,97,238,0.03);padding:1.5rem;border-radius:0 8px 8px 0}.navigation-buttons{background:white;padding:1.5rem;border-radius:12px;box-shadow:var(--card-shadow);margin-top:2rem}.btn-prev{background:linear-gradient(135deg,#6c757d,#495057);color:white;border:none}.btn-next{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;border:none}.reading-progress{height:4px;background:#e9ecef;position:fixed;top:0;left:0;width:100%;z-index:1000}.reading-progress-bar{height:100%;background:linear-gradient(90deg,var(--primary-color),var(--accent-color));width:0;transition:width 0.3s ease}@media (max-width:768px){.content-card{padding:1.5rem}.toc-card{position:relative;top:0;max-height:300px;margin-bottom:1.5rem}.page-content{font-size:1rem;line-height:1.7}}.fab{position:fixed;bottom:20px;right:20px;z-index:100}.fab-btn{width:50px;height:50px;border-radius:50%;background:var(--primary-color);color:white;border:none;box-shadow:0 4px 12px rgba(0,0,0,0.15);display:flex;align-items:center;justify-content:center;margin-bottom:10px;transition:all 0.3s ease}.fab-btn:hover{transform:scale(1.1);background:var(--secondary-color)}