@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Merriweather:ital,wght@0,300;0,400;0,700;1,300;1,400&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap");*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;scroll-behavior:smooth}body,html{color:var(--text-primary);background-color:var(--bg-app);overflow-x:hidden;max-width:100vw}body{min-height:100vh;display:flex;flex-direction:column;line-height:1.55;font-size:15px}main{flex:1 1}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);color:var(--text-primary);font-weight:700;line-height:1.25;letter-spacing:-.02em}h1{font-size:2.25rem}h2{font-size:1.75rem}h3{font-size:1.35rem}h4{font-size:1.15rem}h5{font-size:1rem}p{color:var(--text-secondary);line-height:1.65}a{color:inherit;text-decoration:none;transition:color .15s ease}button{font-family:inherit;border:none;background:none;cursor:pointer;outline:none}input,select,textarea{font-family:inherit;font-size:.95rem;color:var(--text-primary);border:1px solid var(--border-subtle);border-radius:var(--radius-md);background-color:var(--bg-surface);transition:border-color .15s ease,box-shadow .15s ease}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand-primary);box-shadow:0 0 0 3px rgba(55,48,163,.12)}img{max-width:100%;height:auto;display:block}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-subtle)}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}a,button{-webkit-tap-highlight-color:transparent}.container{width:100%;max-width:var(--max-width);margin-left:auto;margin-right:auto;padding-left:20px;padding-right:20px}@media (max-width:768px){.container{padding-left:16px;padding-right:16px}}@media (max-width:480px){.container{padding-left:12px;padding-right:12px}}:root{--bg-app:#FAF9F5;--bg-surface:#FFFFFF;--bg-surface-raised:#FFFFFF;--bg-subtle:#F3F1EA;--bg-muted:#EBE8DE;--bg-dark:#1E1B18;--text-primary:#1C1917;--text-secondary:#57534E;--text-muted:#78716C;--text-tertiary:#A8A29E;--text-inverse:#FAF9F5;--brand-primary:#3730A3;--brand-primary-hover:#312E81;--brand-primary-light:#EEF2FF;--brand-primary-border:#C7D2FE;--accent-gold:#D97706;--accent-gold-hover:#B45309;--accent-gold-subtle:#FEF3C7;--accent-gold-border:#FDE68A;--price-free-bg:#ECFDF5;--price-free-text:#047857;--price-free-border:#A7F3D0;--price-9-bg:#EFF6FF;--price-9-text:#1D4ED8;--price-9-border:#BFDBFE;--price-19-bg:#F5F3FF;--price-19-text:#6D28D9;--price-19-border:#DDD6FE;--price-29-bg:#FFF1F2;--price-29-text:#BE123C;--price-29-border:#FECDD3;--price-bundle-bg:#FFFBEB;--price-bundle-text:#92400E;--price-bundle-border:#FCD34D;--success:#10B981;--success-bg:#ECFDF5;--warning:#F59E0B;--danger:#EF4444;--danger-bg:#FEF2F2;--info:#3B82F6;--border-subtle:#E7E5E0;--border-strong:#D6D3CD;--border-focus:#3730A3;--shadow-xs:0 1px 2px rgba(28,25,23,0.04);--shadow-sm:0 2px 4px rgba(28,25,23,0.05),0 1px 2px rgba(28,25,23,0.03);--shadow-md:0 4px 10px rgba(28,25,23,0.06),0 2px 4px rgba(28,25,23,0.03);--shadow-lg:0 10px 25px rgba(28,25,23,0.08),0 4px 8px rgba(28,25,23,0.04);--shadow-xl:0 20px 35px rgba(28,25,23,0.10);--shadow-book:2px 4px 12px rgba(28,25,23,0.12),0 1px 3px rgba(28,25,23,0.08);--radius-xs:4px;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:20px;--radius-full:9999px;--font-sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--font-heading:"Plus Jakarta Sans","Inter",-apple-system,BlinkMacSystemFont,sans-serif;--font-serif:"Merriweather",Georgia,Cambria,"Times New Roman",Times,serif;--header-height:70px;--header-height-mobile:58px;--mobile-nav-height:60px;--safe-area-bottom:env(safe-area-inset-bottom,0px);--safe-area-top:env(safe-area-inset-top,0px);--max-width:1240px;--reader-max-width:720px;--reader-bg:#FAF9F5;--reader-text:#1C1917;--reader-meta:#78716C;--reader-border:#E7E5E0}[data-theme=sepia]{--reader-bg:#F4ECD8;--reader-text:#3D3226;--reader-meta:#7A6953;--reader-border:#E2D5BE}[data-theme=dark]{--reader-bg:#1A1918;--reader-text:#E5E2DC;--reader-meta:#9C968B;--reader-border:#2D2B28}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font-sans);font-size:.925rem;font-weight:600;padding:10px 18px;border-radius:var(--radius-md);transition:all .15s ease-in-out;cursor:pointer;white-space:nowrap;line-height:1.2;-webkit-user-select:none;-moz-user-select:none;user-select:none}.btn-primary{background-color:var(--brand-primary);color:#FFFFFF;box-shadow:0 1px 3px rgba(55,48,163,.2)}.btn-primary:hover{background-color:var(--brand-primary-hover);box-shadow:0 4px 12px rgba(55,48,163,.25);transform:translateY(-1px)}.btn-accent{background-color:var(--accent-gold);color:#FFFFFF;box-shadow:0 1px 3px rgba(217,119,6,.25)}.btn-accent:hover{background-color:var(--accent-gold-hover);box-shadow:0 4px 12px rgba(217,119,6,.3);transform:translateY(-1px)}.btn-secondary{background-color:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border-subtle);box-shadow:var(--shadow-xs)}.btn-secondary:hover{background-color:var(--bg-subtle);border-color:var(--border-strong)}.btn-outline{background-color:transparent;color:var(--brand-primary);border:1.5px solid var(--brand-primary)}.btn-outline:hover{background-color:var(--brand-primary-light)}.btn-sm{padding:6px 12px;font-size:.825rem;border-radius:var(--radius-sm)}.btn-lg{padding:13px 24px;font-size:1.05rem;border-radius:var(--radius-lg)}.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--radius-md);justify-content:center}.badge,.btn-icon{display:inline-flex;align-items:center}.badge{gap:4px;font-size:.75rem;font-weight:700;padding:3px 8px;border-radius:var(--radius-full);letter-spacing:.02em;text-transform:uppercase;line-height:1}.badge-free{background-color:var(--price-free-bg);color:var(--price-free-text);border:1px solid var(--price-free-border)}.badge-9{background-color:var(--price-9-bg);color:var(--price-9-text);border:1px solid var(--price-9-border)}.badge-19{background-color:var(--price-19-bg);color:var(--price-19-text);border:1px solid var(--price-19-border)}.badge-29{background-color:var(--price-29-bg);color:var(--price-29-text);border:1px solid var(--price-29-border)}.badge-bundle{background-color:var(--price-bundle-bg);color:var(--price-bundle-text);border:1px solid var(--price-bundle-border)}.badge-exam{background-color:#F3E8FF;color:#7E22CE;border:1px solid #e9d5ff}.badge-subtle{background-color:var(--bg-subtle);color:var(--text-secondary);border:1px solid var(--border-subtle)}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:50;background-color:rgba(250,249,245,.94);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-subtle);height:var(--header-height)}.header-container,.site-header{display:flex;align-items:center}.header-container{justify-content:space-between;gap:20px;width:100%}.brand-logo{gap:10px;font-family:var(--font-heading);font-weight:800;font-size:1.35rem;color:var(--text-primary);letter-spacing:-.03em}.brand-logo,.brand-logo-icon{display:flex;align-items:center}.brand-logo-icon{width:34px;height:34px;background:linear-gradient(135deg,#3730A3,#4F46E5);color:#FFFFFF;border-radius:9px;justify-content:center;box-shadow:0 2px 6px rgba(55,48,163,.25)}.header-nav{display:flex;align-items:center;gap:20px}.nav-link{font-size:.925rem;font-weight:500;color:var(--text-secondary);padding:6px 10px;border-radius:var(--radius-sm);transition:all .15s ease}.nav-link.active,.nav-link:hover{color:var(--brand-primary);background-color:var(--brand-primary-light)}.header-search{flex:1 1;max-width:360px;position:relative}.header-search input{width:100%;padding:9px 14px 9px 38px;font-size:.88rem;background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-full)}.header-search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-muted);pointer-events:none}.header-actions{display:flex;align-items:center;gap:12px}.book-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;transition:all .22s ease-in-out;position:relative;height:100%}.book-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--border-strong)}.book-card-cover-container{aspect-ratio:1/1.38;width:100%;position:relative;background-color:var(--bg-subtle);overflow:hidden;display:flex;align-items:center;justify-content:center;padding:14px}.book-card-cover{width:100%;height:100%;object-fit:cover;border-radius:6px;box-shadow:var(--shadow-book);transition:transform .25s ease}.book-card:hover .book-card-cover{transform:none}.book-card-badge{position:absolute;top:10px;left:10px;z-index:2}.book-card-details{padding:14px 16px;display:flex;flex-direction:column;flex:1 1}.book-card-category{font-size:.75rem;font-weight:600;color:var(--brand-primary);text-transform:uppercase;letter-spacing:.04em;margin-bottom:4px}.book-card-title{font-family:var(--font-heading);font-size:.98rem;font-weight:700;line-height:1.3;color:var(--text-primary);margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.book-card-author{font-size:.825rem;color:var(--text-secondary);margin-bottom:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.book-card-footer{margin-top:auto;display:flex;align-items:center;justify-content:space-between;padding-top:10px;border-top:1px solid var(--border-subtle)}.book-card-price{font-family:var(--font-heading);font-weight:700;font-size:1.05rem;color:var(--text-primary)}.book-card-price.is-free{color:var(--price-free-text)}.bundle-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-sm);transition:all .22s ease;position:relative}.bundle-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--brand-primary-border)}.bundle-collage{background:linear-gradient(135deg,#1E1B4B,#312E81);padding:24px 20px 20px;position:relative;overflow:hidden;color:#FFFFFF}.bundle-badge-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.bundle-count-pill{background:rgba(255,255,255,.18);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:#FFFFFF;padding:4px 12px;border-radius:var(--radius-full);font-size:.78rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.bundle-title{font-family:var(--font-heading);font-size:1.25rem;font-weight:700;color:#FFFFFF;margin-bottom:6px}.bundle-description{font-size:.85rem;color:rgba(255,255,255,.8);line-height:1.45}.bundle-body{padding:18px 20px;display:flex;flex-direction:column;flex:1 1}.bundle-price-row{display:flex;align-items:baseline;gap:10px;margin-bottom:16px}.bundle-price-main{font-family:var(--font-heading);font-size:1.75rem;font-weight:800;color:var(--accent-gold)}.bundle-price-original{font-size:.95rem;color:var(--text-muted);text-decoration:line-through}.bundle-savings-tag{background-color:var(--accent-gold-subtle);color:var(--accent-gold);border:1px solid var(--accent-gold-border);font-size:.75rem;font-weight:700;padding:2px 8px;border-radius:var(--radius-full)}.exam-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:22px;display:flex;flex-direction:column;transition:all .2s ease;position:relative}.exam-card:hover{transform:translateY(-2px);border-color:var(--brand-primary-border);box-shadow:var(--shadow-md)}.exam-card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.exam-card-icon{width:44px;height:44px;border-radius:var(--radius-md);background-color:var(--brand-primary-light);color:var(--brand-primary);display:flex;align-items:center;justify-content:center}.exam-card-title{font-family:var(--font-heading);font-size:1.2rem;font-weight:700;color:var(--text-primary);margin-bottom:6px}.exam-card-desc{font-size:.85rem;color:var(--text-secondary);line-height:1.5;margin-bottom:14px;flex:1 1}.exam-subject-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px}.subject-tag{font-size:.725rem;background-color:var(--bg-subtle);color:var(--text-secondary);padding:3px 8px;border-radius:var(--radius-xs);font-weight:500}.category-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:16px;display:flex;align-items:center;gap:14px;transition:all .15s ease}.category-card:hover{border-color:var(--brand-primary);background-color:var(--brand-primary-light);transform:translateY(-1px)}.category-card-icon{width:40px;height:40px;border-radius:var(--radius-sm);background-color:var(--bg-subtle);color:var(--brand-primary);display:flex;align-items:center;justify-content:center;flex-shrink:0}.category-card-info h4{font-size:.95rem;font-weight:600;margin-bottom:2px}.category-card-info span{font-size:.775rem;color:var(--text-muted)}.trust-strip{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:16px;gap:16px;background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:18px 24px;box-shadow:var(--shadow-xs);margin-top:30px}.trust-item{gap:12px}.trust-item,.trust-item-icon{display:flex;align-items:center}.trust-item-icon{width:38px;height:38px;border-radius:var(--radius-full);background-color:var(--brand-primary-light);color:var(--brand-primary);justify-content:center;flex-shrink:0}.trust-item-text strong{display:block;font-size:.925rem;font-weight:700;color:var(--text-primary)}.trust-item-text span{font-size:.775rem;color:var(--text-muted)}.tabs-bar{display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--border-subtle);overflow-x:auto;padding-bottom:1px}.tab-btn{padding:10px 18px;font-size:.925rem;font-weight:600;color:var(--text-secondary);border-bottom:2px solid transparent;white-space:nowrap;transition:all .15s ease}.tab-btn:hover{color:var(--text-primary)}.tab-btn.active{color:var(--brand-primary);border-bottom-color:var(--brand-primary)}.filter-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;font-size:.85rem;font-weight:500;background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-full);color:var(--text-secondary);cursor:pointer;transition:all .15s ease}.filter-chip:hover{border-color:var(--brand-primary);color:var(--brand-primary)}.filter-chip.active{background-color:var(--brand-primary);border-color:var(--brand-primary);color:#FFFFFF}.modal-overlay{position:fixed;inset:0;background-color:rgba(28,25,23,.6);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:100;display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn .15s ease-out}.modal-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);max-width:520px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-xl);padding:28px;position:relative;animation:scaleUp .18s ease-out}.toast-container{position:fixed;bottom:80px;right:24px;z-index:110;display:flex;flex-direction:column;gap:8px;pointer-events:none}.toast-message{pointer-events:auto;background-color:var(--bg-dark);color:var(--text-inverse);padding:12px 18px;border-radius:var(--radius-md);font-size:.875rem;box-shadow:var(--shadow-lg);display:flex;align-items:center;gap:10px;animation:slideInUp .2s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes scaleUp{0%{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}@keyframes slideInUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.footer-link{display:inline-block;transition:color .2s ease,transform .2s ease}.footer-link:hover{color:#38BDF8!important;transform:translateX(3px)}.reader-page{min-height:100vh;color:var(--reader-text);transition:background-color .2s ease,color .2s ease;flex-direction:column}.reader-header,.reader-page{background-color:var(--reader-bg);display:flex}.reader-header{position:-webkit-sticky;position:sticky;top:0;z-index:40;height:60px;border-bottom:1px solid var(--reader-border);align-items:center;justify-content:space-between;padding:0 20px;transition:all .2s ease}.reader-header-left,.reader-header-right{display:flex;align-items:center;gap:12px}.reader-header-center{flex:1 1;max-width:540px;text-align:center;padding:0 16px}.reader-book-title{font-family:var(--font-heading);font-size:.95rem;font-weight:700;color:var(--reader-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.reader-progress-label{font-size:.775rem;color:var(--reader-meta)}.reader-btn{width:38px;height:38px;border-radius:var(--radius-md);display:inline-flex;align-items:center;justify-content:center;color:var(--reader-text);background:transparent;border:1px solid transparent;cursor:pointer;transition:all .15s ease}.reader-btn:hover{background-color:rgba(125,125,125,.12);border-color:var(--reader-border)}.reader-btn.active{color:var(--brand-primary);background-color:rgba(55,48,163,.12)}.reading-progress-track{position:fixed;top:0;left:0;right:0;height:3px;background-color:rgba(0,0,0,.05);z-index:50}.reading-progress-bar{height:100%;background-color:var(--brand-primary);transition:width .15s ease-out}.reader-content-wrap{flex:1 1;width:100%;max-width:var(--reader-max-width);margin:0 auto;padding:40px 24px 80px}.reader-chapter-meta{text-align:center;margin-bottom:36px;padding-bottom:24px;border-bottom:1px dashed var(--reader-border)}.reader-chapter-number{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--reader-meta);margin-bottom:8px}.reader-chapter-title{font-size:1.85rem;line-height:1.3;color:var(--reader-text);font-weight:700}.reader-prose{transition:font-size .15s ease,line-height .15s ease}.reader-prose.font-serif{font-family:var(--font-serif)}.reader-prose.font-sans{font-family:var(--font-sans)}.reader-prose p{color:var(--reader-text);margin-bottom:1.5em;text-align:justify}.reader-prose h2,.reader-prose h3{color:var(--reader-text);margin:2em 0 .8em}.reader-prose ol,.reader-prose ul{margin:1.2em 0 1.5em 1.5em;color:var(--reader-text)}.reader-prose li{margin-bottom:.5em}.reader-prose blockquote{border-left:3px solid var(--brand-primary);padding-left:18px;margin:1.8em 0;font-style:italic;color:var(--reader-meta)}.reader-prose .highlight-box{background-color:rgba(55,48,163,.06);border:1px solid var(--reader-border);border-radius:var(--radius-md);padding:16px 20px;margin:1.8em 0}.reader-bottom-nav{display:flex;align-items:center;justify-content:space-between;margin-top:48px;padding-top:24px;border-top:1px solid var(--reader-border)}.entitlement-gate{background:linear-gradient(to bottom,rgba(250,249,245,0) 0,var(--reader-bg) 25%);margin-top:-120px;padding-top:140px;position:relative;z-index:10;text-align:center}.entitlement-gate-card{border:1.5px solid var(--border-subtle);border-radius:var(--radius-xl);padding:36px 28px;max-width:540px;margin:0 auto}.entitlement-gate-card,.reader-toc-drawer{background-color:var(--bg-surface);box-shadow:var(--shadow-xl)}.reader-toc-drawer{position:fixed;top:0;left:0;bottom:0;width:340px;max-width:85vw;z-index:60;transform:translateX(-100%);transition:transform .25s ease;display:flex;flex-direction:column}.reader-toc-drawer.open{transform:translateX(0)}.reader-toc-header{padding:18px 20px;border-bottom:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:space-between}.reader-toc-list{flex:1 1;overflow-y:auto;padding:12px 0}.reader-toc-item{padding:12px 20px;font-size:.9rem;color:var(--text-secondary);display:flex;align-items:center;justify-content:space-between;cursor:pointer;border-left:3px solid transparent;transition:all .15s 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