:root{--primary-blue:#1e5292;--dark-blue:#164175;--orange-gold:#ffa726;--white:#fff;--light-bg:#f9f9f9;--text-dark:#222;--text-medium:#444;--border-color:#ccc}body{color:var(--text-dark);background:#fff;font-family:sans-serif,serif;line-height:1.8}.product-hero{background:var(--primary-blue);color:#fff;padding:20px}.hero-content{align-items:center;gap:20px;max-width:1400px;margin:0 auto;display:flex}.back-btn{color:var(--primary-blue);cursor:pointer;background:#fff;border:2px solid #fff;padding:8px 10px;font-size:14px;font-weight:700;transition:all .3s}.back-btn:hover{color:#fff;background:0 0}.back-btn i{font-size:12px}.product-hero h1{letter-spacing:1px;text-transform:uppercase;text-align:center;flex:1;margin:0;font-size:25px;font-weight:700}.product-wrapper{gap:25px;max-width:1400px;margin:20px auto;padding:0 20px;display:flex}.product-sidebar{flex-shrink:0;width:200px;height:fit-content;position:sticky;top:20px}.sidebar-card{border:1px solid var(--border-color);background:#fff;padding:20px}.sidebar-card h3{color:var(--primary-blue);letter-spacing:.5px;border-bottom:2px solid var(--primary-blue);text-transform:uppercase;margin-bottom:15px;padding-bottom:10px;font-size:16px;font-weight:700}.sidebar-card ul{margin-top:15px;padding:0;list-style:none}.sidebar-card li{border-bottom:1px dotted #ddd;margin-bottom:8px;padding-bottom:8px}.sidebar-card li:last-child{border-bottom:none}.sidebar-card li a{color:var(--text-medium);padding:5px 0;font-size:12px;text-decoration:none;transition:color .2s;display:block}.sidebar-card li a:hover,.sidebar-card li a.active{color:var(--primary-blue);text-decoration:underline}.sidebar-card li i{color:var(--orange-gold);margin-right:8px;font-size:11px}.product-container{flex:1;min-width:0}.product-section{border:1px solid var(--border-color);background:#fff;padding:10px}.product-grid{border-bottom:3px double var(--primary-blue);grid-template-columns:300px 1fr;gap:20px;margin-bottom:40px;padding-bottom:40px;display:grid}.book-cover-large{background:#fff}.book-cover-large img{width:100%;height:auto;display:block}.book-details{flex-direction:column;display:flex}.book-details h1{color:var(--dark-blue);letter-spacing:.5px;margin:0;font-size:18px;font-weight:700;line-height:1.3}.author-list{color:var(--text-medium);border-bottom:1px solid var(--border-color);margin:0;padding-bottom:15px;font-size:13px;font-style:italic;line-height:1.6}.author-list strong{color:var(--primary-blue);font-size:14px;font-style:normal}.co-authors-text{color:var(--text-medium)}.meta-info{background:var(--light-bg);border:1px solid var(--border-color);padding:15px}.meta-item{border-bottom:1px dotted var(--border-color);justify-content:space-between;align-items:center;padding:2px 0;font-size:14px;display:flex}.meta-item:last-child{border-bottom:none}.meta-item strong{color:var(--dark-blue);min-width:120px;font-weight:700}.meta-item span{color:var(--text-medium);text-align:right}.meta-item.clickable{cursor:pointer;transition:background .2s}.meta-item.clickable:hover{background:#ffa7261a}.online-selling-links{border:1px solid var(--border-color);border-left:4px solid var(--primary-blue);background:#fff;margin-top:25px;padding:15px}.online-selling-links h3{color:var(--dark-blue);text-transform:uppercase;letter-spacing:.5px;margin-top:0;margin-bottom:12px;font-size:14px;font-weight:700}.selling-link-btn{border-radius:4px;align-items:center;gap:8px;margin-bottom:8px;margin-right:10px;padding:8px 15px;font-size:13px;font-weight:600;text-decoration:none;transition:all .2s;display:inline-flex;color:#fff!important}.selling-link-btn i{font-size:14px}.selling-link-btn.google{background-color:#4285f4}.selling-link-btn.google:hover{background-color:#357ae8;box-shadow:0 2px 5px #4285f44d}.selling-link-btn.flipkart{color:#fff;background-color:#2874f0}.selling-link-btn.flipkart:hover{background-color:#1a62d6;box-shadow:0 2px 5px #2874f04d}.selling-link-btn.amazon{background-color:#232f3e}.selling-link-btn.amazon:hover{background-color:#1a242f;box-shadow:0 2px 5px #232f3e4d}@media (max-width:480px){.selling-link-btn{justify-content:center;margin-right:0;display:flex}}.pricing-options{border:2px solid var(--primary-blue);grid-template-columns:repeat(3,1fr);gap:0;margin-top:20px;display:grid}.pricing-card{text-align:center;background:#fff;border-right:1px solid silver;flex-direction:column;align-items:center;padding:20px 16px;transition:transform .2s,z-index;display:flex;position:relative}.pricing-card:hover{z-index:10}.pricing-card:last-child{border-right:none}.pricing-card.featured{background:#f5f8fc;border-right:none}.pricing-card-badge{background:var(--primary-blue);color:#fff;letter-spacing:1px;text-transform:uppercase;padding:3px 10px;font-family:Georgia,serif;font-size:9px;font-weight:700;position:absolute;bottom:0;right:0}.pricing-card .pricing-icon{display:none}.contact-trigger{color:var(--primary-blue);cursor:pointer;border-bottom:1px dashed var(--primary-blue);padding-bottom:1px;font-family:Georgia,serif;font-size:16px;font-weight:700;display:inline-block;position:relative;overflow:visible}.contact-dropdown{border:1px solid var(--border-color);z-index:999;background:#fff;border-radius:8px;flex-direction:column;gap:12px;min-width:170px;padding:10px;display:none;position:absolute;top:calc(100% + 6px);left:50%;transform:translate(-50%);box-shadow:0 6px 16px #00000026}.pricing-card:hover .contact-dropdown{display:flex}.contact-dropdown:before{content:"";height:8px;position:absolute;top:-8px;left:0;right:0}.contact-option{color:var(--text-dark);white-space:nowrap;background:#f8f9fa;border:1px solid #eaeaea;border-radius:6px;justify-content:flex-start;align-items:center;gap:12px;padding:10px 14px;font-family:sans-serif;font-size:14px;font-weight:700;text-decoration:none;transition:all .2s;display:flex}.contact-option:last-child{border-bottom:1px solid #eaeaea}.contact-option:hover{background:var(--light-bg);border-color:var(--primary-blue);color:var(--primary-blue);transform:translateY(-2px);box-shadow:0 4px 10px #0000000f}.contact-icon{font-size:22px!important}.wa-icon{color:#25d366}.phone-icon{color:var(--primary-blue)}.contact-text{text-align:left;flex:1}.pricing-card p{color:var(--dark-blue);text-transform:uppercase;letter-spacing:1px;border-bottom:1px solid var(--border-color);width:100%;margin:0 0 8px;padding-bottom:8px;font-family:Georgia,Times New Roman,serif;font-size:12px;font-weight:700}.pricing-card .cardPrice{color:var(--primary-blue);margin:10px 0 6px;font-family:Georgia,Times New Roman,serif;font-size:28px;font-weight:700;line-height:1.1}.pricing-card small{color:var(--text-medium);margin-bottom:12px;font-family:Georgia,serif;font-size:11px;font-style:italic;display:block}.pricing-card-divider{background:var(--border-color);width:100%;height:1px;margin:8px 0}.pricing-card-features{text-align:left;width:100%;margin:0;padding:0;list-style:none}.pricing-card-features li{color:var(--text-medium);border-bottom:1px dotted var(--border-color);align-items:flex-start;gap:6px;padding:3px 0;font-family:Georgia,serif;font-size:11px;display:flex}.pricing-card-features li:last-child{border-bottom:none}.pricing-card-features li:before{content:"■";color:var(--orange-gold);flex-shrink:0;margin-top:2px;font-size:8px}.tabs-container{width:100%;margin-top:30px}.tab-buttons{border-bottom:2px solid var(--border-color);flex-wrap:wrap;justify-content:center;gap:10px;padding-bottom:20px;display:flex}.tab-btn{border:2px solid var(--primary-blue);cursor:pointer;color:var(--primary-blue);text-transform:uppercase;letter-spacing:.5px;background:#fff;padding:10px 20px;font-family:Georgia,Times New Roman,serif;font-size:12px;font-weight:700;transition:all .3s}.tab-btn:hover{background:var(--light-bg)}.tab-btn.active{background:var(--primary-blue);color:#fff;border-color:var(--primary-blue)}.tab-content-wrapper{margin-top:30px}.tab-content{background:var(--light-bg);border:1px solid var(--border-color);padding:30px;display:none}.tab-content.active{display:block}.tab-content h3{color:var(--dark-blue);border-bottom:2px solid var(--primary-blue);text-transform:uppercase;letter-spacing:.5px;margin-bottom:20px;padding-bottom:10px;font-size:22px;font-weight:700}.tab-content p{color:var(--text-dark);text-align:justify;margin-bottom:15px;font-size:14px;line-height:1.9}.tab-content ul{padding-left:0;list-style:none}.tab-content ul li{color:var(--text-dark);border-bottom:1px dotted var(--border-color);padding:10px 0 10px 25px;font-size:14px;line-height:1.7;position:relative}.tab-content ul li:last-child{border-bottom:none}.tab-content ul li:before{content:"■";color:var(--orange-gold);font-size:12px;position:absolute;left:0}.author-bio{border-bottom:1px solid var(--border-color);margin-bottom:20px;padding-bottom:20px}.author-bio:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.author-bio p strong{color:var(--primary-blue);font-weight:700}.loading-container,.error-container{flex-direction:column;justify-content:center;align-items:center;min-height:500px;padding:40px;display:flex}.loading-spinner{border:4px solid var(--light-bg);border-top-color:var(--primary-blue);border-radius:50%;width:50px;height:50px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.loading-container p{color:var(--text-medium);margin-top:20px;font-size:16px}.error-message{text-align:center;background:#fff;border:2px solid #dc3545;max-width:500px;padding:40px}.error-message i{color:#dc3545;margin-bottom:20px;font-size:48px}.error-message h3{color:#dc3545;margin-bottom:15px;font-size:24px}.error-message p{color:var(--text-medium);margin-bottom:25px;line-height:1.6}.back-button{background:var(--primary-blue);color:#fff;border:2px solid var(--primary-blue);cursor:pointer;text-transform:uppercase;letter-spacing:.5px;padding:10px 30px;font-size:14px;font-weight:700;transition:all .3s}.back-button:hover{color:var(--primary-blue);background:#fff}@media (max-width:1024px){.product-grid{grid-template-columns:300px 1fr;gap:30px}.product-sidebar{width:180px}}@media (max-width:968px){.product-wrapper{flex-direction:column}.product-sidebar{width:100%;position:relative;top:0}.product-grid{grid-template-columns:1fr;gap:30px}.book-cover-large{max-width:400px;margin:0 auto}.pricing-options{grid-template-columns:repeat(3,1fr)}}@media (max-width:768px){.product-hero{padding:40px 15px 25px}.product-hero h1{font-size:22px}.product-wrapper{margin:30px auto;padding:0 15px}.product-section{padding:25px 20px}.book-details h1{font-size:24px}.pricing-options{grid-template-columns:1fr;gap:12px}.pricing-card{padding:18px 12px}.action-btn{width:55px;height:55px}.action-btn i{font-size:22px}.tab-buttons{gap:8px}.tab-btn{padding:8px 16px;font-size:11px}.tab-content{padding:20px}}@media (max-width:480px){.product-hero{padding:30px 10px 20px}.product-wrapper{margin:20px auto;padding:0 10px}.product-section{padding:20px 15px}.book-cover-large{max-width:280px}.book-details h1{font-size:20px}.author-list{font-size:14px}.meta-info{padding:15px}.meta-item{flex-direction:column;align-items:flex-start;gap:5px}.meta-item strong{min-width:auto}.meta-item span{text-align:left}.tab-btn{padding:7px 12px;font-size:10px}.tab-content{padding:15px}.tab-content h3{font-size:18px}.sidebar-card{padding:15px}}@media (max-width:360px){.book-cover-large{max-width:240px}.tab-buttons{flex-direction:column}.tab-btn{width:100%}}
.chapter-detail-page{background-color:#f4f6f9;padding:20px 15px}.breadcrumbs{color:#666;align-items:center;gap:8px;margin-bottom:20px;font-size:13px;display:flex}.breadcrumbs a{color:var(--primary-blue);text-decoration:none;transition:all .2s}.breadcrumbs a:hover{text-decoration:underline}.breadcrumb-separator{color:#999}.breadcrumbs .current-page{color:#333;white-space:nowrap;text-overflow:ellipsis;max-width:min(400px,50vw);font-weight:500;overflow:hidden}.chapter-layout{gap:20px;max-width:1400px;margin:0 auto;display:flex}.chapter-main{flex-direction:column;flex:1;gap:20px;display:flex}.chapter-sidebar{flex-direction:column;gap:20px;width:350px;display:flex}.chapter-abstract-box{background:#fff;border:1px solid #e0e0e0;border-radius:8px;padding:20px;box-shadow:0 2px 10px #0000000d}.chapter-info-header{border-bottom:1px solid #eee;grid-template-columns:auto 1fr;align-items:start;gap:20px;margin-bottom:20px;padding-bottom:15px;display:grid}.book-cover-thumbnail{background:#fff;flex-shrink:0;width:200px}.book-cover-thumbnail img{object-fit:contain;width:100%;height:auto;max-height:300px;display:block}.chapter-info-text{overflow-wrap:break-word;word-break:break-word;min-width:0}.main-chapter-title{color:var(--dark-blue);margin:0 0 10px;font-size:16px;line-height:1.3}.main-chapter-authors{color:#0080ff;overflow-wrap:break-word;word-break:break-word;margin:0 0 15px;font-size:14px;font-weight:500}.author-link{color:inherit;text-decoration:none;transition:opacity .2s}.author-link:hover{opacity:.8;text-decoration:underline}.author-affiliation{color:#555;font-size:13px;font-weight:400}.meta-details-grid{grid-template-columns:1fr;gap:8px;font-size:12px;display:grid}.meta-info-item strong{color:#555;margin-right:8px}.meta-info-item span{color:var(--dark-blue)}.clickable:hover{cursor:pointer}.abstract-content h3{color:var(--dark-blue);border-bottom:2px solid var(--border-color);margin-bottom:10px;padding-bottom:8px;font-size:14px}.abstract-content p{color:#333;text-align:justify;margin-bottom:10px;font-size:12px;line-height:1.6}.toc-frontmatter-row{background-color:#f8f9fa;border:1px solid #e0e0e0;border-radius:6px;justify-content:space-between;align-items:center;margin-bottom:12px;padding:12px 16px;display:flex}.toc-frontmatter-row .row-title{color:var(--dark-blue,#1e3a5f);font-size:15px;font-weight:600}.btn-view-pdf{color:#fff;cursor:pointer;background-color:#1e3a5f;border:none;border-radius:4px;align-items:center;gap:6px;padding:6px 12px;font-size:13px;font-weight:600;transition:opacity .2s;display:flex}.btn-view-pdf:hover{opacity:.9}.complete-chapter-list{background:#fff;border:1px solid #e0e0e0;border-radius:8px;padding:20px;box-shadow:0 2px 10px #0000000d}.complete-chapter-list h3{color:var(--dark-blue);margin-bottom:15px;font-size:16px}.toc-search-bar{gap:10px;margin-bottom:15px;display:flex}.toc-search-bar input{border:1px solid #ccc;border-radius:4px;flex:1;padding:8px 12px;font-size:12px}.toc-search-bar button{background-color:var(--primary-blue);color:#fff;cursor:pointer;border:none;border-radius:4px;padding:8px 16px;font-size:12px}.toc-list{flex-direction:column;gap:12px;display:flex}.toc-chapter-card{background-color:#fff;border:1px solid #e0e0e0;border-radius:6px;flex-direction:row;align-items:stretch;gap:16px;padding:16px;display:flex;box-shadow:0 1px 3px #0000000d}.toc-chapter-card.active-chapter{border:2px solid var(--primary-blue);background-color:#f8fbff}.chapter-card-left{flex-direction:column;flex:1;gap:4px;min-width:0;display:flex}.chapter-badge{color:#fff;background-color:#6c757d;border-radius:4px;margin-bottom:8px;padding:4px 10px;font-size:10px;font-weight:700;display:inline-block}.chapter-title{margin:0 0 6px;font-size:14px;font-weight:600}.chapter-title a{color:var(--primary-blue);text-decoration:none}.chapter-title a:hover{text-decoration:underline}.chapter-pages{color:#6c757d;font-size:12px;font-weight:400}.chapter-authors{color:#198754;margin:0;font-size:12px;font-style:normal}.chapter-abstract{color:#6c757d;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;margin:0;font-size:11px;line-height:1.5;display:-webkit-box;overflow:hidden}.chapters-actions-area{border-left:1px solid #e0e0e0;flex-direction:column;flex-shrink:0;justify-content:center;align-items:stretch;gap:8px;width:140px;min-width:120px;padding-left:16px;display:flex}.ch-price-box{text-align:center;margin-bottom:5px}.ch-price-box span{color:#666;font-size:10px;display:block}.ch-price-box strong{color:#2e7d32;margin-top:5px;font-size:14px;display:block}.btn-add-cart-alt,.btn-view-pdf-alt,.btn-preview{cursor:pointer;border:none;border-radius:4px;justify-content:center;align-items:center;width:100%;padding:6px;font-size:12px;font-weight:600;transition:opacity .2s;display:inline-flex}.btn-add-cart-alt{color:#fff;background-color:#1e3a5f;gap:8px}.btn-view-pdf-alt{color:#fff;background-color:#1e3a5f;gap:6px}.btn-preview{color:#fff;background-color:#6c757d}.btn-add-cart-alt:hover,.btn-view-pdf-alt:hover,.btn-preview:hover{opacity:.9}.buy-card{background:#fff;border:1px solid #0056b3;border-radius:6px;padding:15px}.buy-card h4{color:#fff;text-align:center;background-color:#0056b3;border-radius:5px 5px 0 0;margin:-15px -15px 15px;padding:12px;font-size:14px}.sidebar-price-row{justify-content:space-between;align-items:center;margin-bottom:15px;padding:10px 0;display:flex}.sidebar-price-row strong{color:#2e7d32;font-size:16px}.btn-add-cart-sidebar{background-color:var(--primary-blue);color:#fff;cursor:pointer;border:none;border-radius:4px;justify-content:center;align-items:center;gap:8px;width:100%;padding:8px;font-size:12px;font-weight:700;display:flex}.sidebar-accordions{background:#fff;border:1px solid #e0e0e0;border-radius:6px;overflow:hidden}.acc-item{color:var(--dark-blue);cursor:pointer;border-bottom:1px solid #e0e0e0;padding:10px;font-size:12px;font-weight:600}.acc-item:last-child{border-bottom:none}.acc-item:hover{background-color:#f8f9fa}.sidebar-librarians{padding:15px}.sidebar-librarians h4{color:var(--dark-blue);border-bottom:2px solid var(--border-color);margin-bottom:15px;padding-bottom:8px;font-size:14px}.sidebar-librarians ul{margin:0;padding:0;list-style:none}.sidebar-librarians li{margin-bottom:10px}.sidebar-librarians a{color:var(--primary-blue);font-size:12px;text-decoration:none}.sidebar-librarians a:hover{text-decoration:underline}@media (max-width:1024px){.chapter-layout{flex-direction:column}.chapter-sidebar{width:100%}}.chapter-link-span{cursor:pointer;color:var(--primary-color,#0056b3);transition:all .2s}.chapter-link-span:hover{color:var(--primary-hover,#004494);text-decoration:underline}@media (max-width:900px){.book-cover-thumbnail{width:160px}}@media (max-width:768px){.chapter-info-header{grid-template-columns:1fr;gap:14px}.book-cover-thumbnail{width:180px;margin:0 auto}.main-chapter-authors span{white-space:normal!important;display:inline!important}.toc-chapter-row{flex-direction:column}.ch-row-actions{border-left:none;align-items:flex-start;min-width:100%;padding-left:0}.ch-price-box{text-align:left;margin-bottom:15px}.chapter-detail-page{padding:15px 12px}.chapter-abstract-box,.complete-chapter-list{padding:15px}}@media (max-width:480px){.chapter-detail-page{padding:12px 10px}.breadcrumbs{gap:5px;font-size:12px}.breadcrumbs .current-page{max-width:min(200px,40vw)}.chapter-abstract-box{padding:12px}.book-cover-thumbnail{width:140px}.main-chapter-title{font-size:14px}.main-chapter-authors{font-size:13px}.toc-chapter-card{flex-direction:column;gap:12px;padding:12px}.chapters-actions-area{width:100%;min-width:unset;border-top:1px solid #e0e0e0;border-left:none;flex-flow:wrap;justify-content:space-between;align-items:center;padding-top:10px;padding-left:0}.ch-price-box{text-align:left;margin-bottom:0}.btn-add-cart-alt,.btn-view-pdf-alt,.btn-preview{flex:1;width:auto;padding:6px 8px;font-size:11px}.toc-frontmatter-row{flex-wrap:wrap;gap:8px;padding:10px 12px}.toc-frontmatter-row .row-title{font-size:13px}.complete-chapter-list{padding:12px 10px}.toc-search-bar{gap:8px}.toc-search-bar input{padding:7px 10px}.toc-search-bar button{padding:7px 12px}}@media (max-width:360px){.chapter-detail-page{padding:10px 8px}.breadcrumbs{gap:4px;font-size:11px}.breadcrumbs .current-page{max-width:min(160px,35vw)}.chapter-abstract-box{padding:10px}.book-cover-thumbnail{width:120px}.main-chapter-title{font-size:13px}.main-chapter-authors{font-size:12px}.toc-chapter-card{padding:10px}.chapter-title{font-size:13px}.complete-chapter-list{padding:10px 8px}.toc-search-bar{flex-direction:column}.toc-search-bar button{width:100%}.chapters-actions-area{flex-direction:column;align-items:stretch}.btn-add-cart-alt,.btn-view-pdf-alt,.btn-preview{flex:unset;width:100%}}.error-message{text-align:center;background:#fff;border-radius:8px;padding:30px;box-shadow:0 4px 15px #0000000d}.error-message i{color:#e74c3c;margin-bottom:15px;font-size:40px}.back-button{background-color:var(--primary-blue,#1e5292);color:#fff;cursor:pointer;border:none;border-radius:6px;margin-top:15px;padding:10px 20px;font-size:14px;font-weight:600;transition:background-color .2s,transform .1s}.back-button:hover{background-color:var(--primary-hover,#153c6d)}.back-button:active{transform:translateY(1px)}.doi-link{text-decoration:none;color:#007bff!important}.doi-link:hover{text-decoration:underline}