.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.login-container{width:100%;max-width:420px;padding:40px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);position:relative;z-index:10;animation:fadeIn .5s ease}.login-header{text-align:center;margin-bottom:32px}.login-logo{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:16px}.login-logo .logo-icon{width:48px;height:48px;font-size:1.5rem}.login-logo span{font-size:1.3rem;font-weight:700;color:var(--text-primary)}.login-subtitle{color:var(--text-secondary);font-size:.95rem}.login-form{margin-bottom:24px}.login-info{text-align:center;padding:20px;background:var(--bg-secondary);border-radius:var(--border-radius);margin-bottom:20px}.login-info p{font-size:.9rem;color:var(--text-secondary);line-height:1.6}.login-footer{text-align:center;margin-top:20px}.login-footer p{font-size:.8rem;color:var(--text-muted)}.login-footer a{color:var(--accent-color);text-decoration:none;font-size:.9rem}.login-footer a:hover{text-decoration:underline}.success-message{background:#22c55e26;border:1px solid rgba(34,197,94,.3);color:#22c55e;padding:12px 16px;border-radius:var(--border-radius);margin-bottom:16px;font-size:.9rem;text-align:center}.error-message{background:#ef444426;border:1px solid rgba(239,68,68,.3);color:#ef4444;padding:12px 16px;border-radius:var(--border-radius);margin-bottom:16px;font-size:.9rem;text-align:center}.forgot-password-link:hover{text-decoration:underline}.login-box{width:100%;max-width:420px;padding:40px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius-lg)}.login-box .login-header h1{font-size:3rem;margin-bottom:16px}.login-box .login-header h2{font-size:1.5rem;margin-bottom:8px;color:var(--text-primary)}.login-box .login-header p{color:var(--text-secondary);font-size:.95rem}.btn-login{width:100%;padding:14px 24px;background:var(--accent-color);color:#fff;border:none;border-radius:var(--border-radius);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-login:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px)}.btn-login:disabled{opacity:.7;cursor:not-allowed}.login-bg{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1;pointer-events:none}.login-bg-gradient{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 30% 20%,rgba(139,92,246,.15) 0%,transparent 50%),radial-gradient(circle at 70% 80%,rgba(139,92,246,.1) 0%,transparent 50%)}.login-bg-pattern{position:absolute;top:0;right:0;bottom:0;left:0;opacity:.03;background-image:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%238B5CF6' fill-opacity='1'%3E%3Cpath d='M36 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h1{font-size:2rem;margin-bottom:4px;background:linear-gradient(135deg,var(--primary),var(--primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.library-header p{color:#b3b3b3;font-size:1rem}.admin-badge{background:linear-gradient(135deg,#f5a623,#ff6b6b);padding:2px 8px;border-radius:12px;font-size:.75rem;margin-left:8px;color:#fff}.expiration-notice{display:flex;align-items:center;gap:12px;padding:16px 20px;background:#f59e0b1a;border:1px solid var(--warning);border-radius:var(--border-radius);margin-bottom:24px;color:var(--warning)}.expiration-notice span{font-size:1.5rem}.tabs-container{margin-top:20px}.tabs-header{display:flex;gap:0;margin-bottom:24px;border-bottom:2px solid var(--border-color)}.tab-btn{flex:1;padding:16px 24px;background:transparent;border:none;border-bottom:3px solid transparent;color:var(--text-secondary);font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:8px}.tab-btn:hover{color:var(--text-primary);background:#ffffff0d}.tab-btn.active{color:var(--primary);border-bottom-color:var(--primary);background:#f5a6231a}.tab-content{animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.ebooks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}.ebook-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:var(--shadow-glow)}.ebook-cover-wrapper{position:relative;width:100%;height:280px;background:var(--bg-secondary);display:flex;align-items:center;justify-content:center;overflow:hidden}.ebook-cover{width:100%;height:100%;object-fit:contain;object-position:center}.ebook-cover-placeholder{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--bg-secondary),var(--bg-hover))}.ebook-cover-placeholder span{font-size:5rem;opacity:.3}.ebook-badge{position:absolute;top:12px;right:12px;background:var(--primary);color:#fff;padding:4px 10px;border-radius:20px;font-size:.8rem;font-weight:600}.ebook-info{padding:16px}.ebook-title{font-size:1.1rem;font-weight:600;margin-bottom:4px;color:var(--text-primary);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.ebook-author{font-size:.9rem;color:var(--text-secondary);margin-bottom:12px}.ebook-description{font-size:.85rem;color:var(--text-muted);margin-bottom:12px;line-height:1.4}.ebook-progress{height:6px;background:var(--border-color);border-radius:3px;overflow:hidden;margin-bottom:16px}.ebook-progress-bar{height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-light));border-radius:3px;transition:width .5s ease}.ebook-card.ebook-locked .ebook-cover-wrapper{position:relative}.ebook-card.ebook-locked .ebook-cover{filter:brightness(.4)}.ebook-lock-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center;background:#0000004d;border-radius:var(--border-radius)}.lock-icon{font-size:3rem;filter:drop-shadow(0 0 10px rgba(0,0,0,.5))}.ebook-price{font-size:1.3rem;font-weight:700;color:var(--accent);margin-bottom:10px;text-align:center}.btn-buy{display:inline-block;background:linear-gradient(135deg,#28a745,#20c997);color:#fff;padding:10px 20px;border-radius:var(--border-radius);text-decoration:none;font-weight:600;transition:all .3s ease;border:none;cursor:pointer}.btn-buy:hover{background:linear-gradient(135deg,#20c997,#28a745);transform:translateY(-2px);box-shadow:0 4px 15px #28a74566}.pdf-badge{position:absolute;top:12px;left:12px;background:linear-gradient(135deg,#dc3545,#ff6b6b);color:#fff;padding:4px 12px;border-radius:20px;font-size:.75rem;font-weight:700;letter-spacing:.5px;box-shadow:0 2px 8px #dc354566}.pdf-card{border:1px solid rgba(220,53,69,.3)}.pdf-card:hover{border-color:#dc3545;box-shadow:0 0 20px #dc354533}.pdf-actions{display:flex;flex-direction:column;gap:8px}.btn-sample{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:linear-gradient(135deg,#6c757d,#868e96);color:#fff;padding:10px 16px;border-radius:var(--border-radius);text-decoration:none;font-weight:500;font-size:.9rem;transition:all .3s ease;border:none;cursor:pointer}.btn-sample:hover{background:linear-gradient(135deg,#868e96,#6c757d);transform:translateY(-2px);box-shadow:0 4px 12px #6c757d66}.btn-disabled{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:#4a4a5a;color:#888;padding:10px 16px;border-radius:var(--border-radius);font-weight:500;font-size:.9rem;border:1px solid #555;cursor:not-allowed;opacity:.7}.pdf-notice{text-align:center;font-size:.8rem;color:var(--warning);margin-top:8px;padding:8px;background:#f59e0b1a;border-radius:var(--border-radius);border:1px solid rgba(245,158,11,.2)}.pdf-description{font-size:.85rem;color:var(--text-muted);margin-bottom:12px;line-height:1.5}.pdf-terms{font-size:.75rem;color:var(--text-muted);margin-top:10px;padding:8px;background:#ffffff0d;border-radius:var(--border-radius);line-height:1.4}.empty-state{text-align:center;padding:80px 20px;max-width:400px;margin:0 auto}.empty-icon{font-size:5rem;margin-bottom:24px;opacity:.3}.empty-state h2{font-size:1.5rem;margin-bottom:12px;color:var(--text-primary)}.empty-state p{color:var(--text-secondary);margin-bottom:8px}.library-footer{padding:24px 0;border-top:1px solid var(--border-color);text-align:center}.library-footer p{font-size:.85rem;color:var(--text-muted)}.expired-access-card{max-width:450px;margin:60px auto;padding:40px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);text-align:center;box-shadow:var(--shadow-lg)}.expired-icon{font-size:4rem;margin-bottom:20px}.expired-access-card h2{font-size:1.8rem;color:var(--danger);margin-bottom:16px}.expired-access-card p{color:var(--text-secondary);margin-bottom:12px;line-height:1.6}.expired-access-card .text-muted{color:var(--text-muted);font-size:.9rem}.expired-actions{margin-top:24px;display:flex;gap:12px;justify-content:center}.user-info{display:flex;align-items:center;gap:15px;flex-wrap:wrap}.user-info p{margin:0}.btn-change-password{background:transparent;border:1px solid var(--accent);color:var(--accent);padding:6px 12px;border-radius:var(--border-radius);cursor:pointer;font-size:.85rem;transition:all .3s ease}.btn-change-password:hover{background:var(--accent);color:#fff}.modal-content{background:var(--bg-card);border-radius:var(--border-radius-lg);width:100%;max-width:400px;max-height:90vh;overflow-y:auto;box-shadow:0 10px 40px #00000080}.modal-header h2{margin:0;font-size:1.25rem}.password-form{padding:20px}.password-form .form-group{margin-bottom:15px}.password-form label{display:block;margin-bottom:5px;font-size:.9rem;color:var(--text-secondary)}.password-form input{width:100%;padding:10px 12px;border:1px solid var(--border-color);border-radius:var(--border-radius);background:var(--bg-secondary);color:var(--text-primary);font-size:1rem}.password-form input:focus{outline:none;border-color:var(--accent)}.password-form input:disabled{opacity:.6;cursor:not-allowed}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}.password-form .alert{margin-bottom:15px;padding:10px;border-radius:var(--border-radius);display:flex;align-items:center;gap:8px}.password-form .alert-error{background:#dc35451a;border:1px solid rgba(220,53,69,.3);color:#dc3545}.password-form .alert-success{background:#28a7451a;border:1px solid rgba(40,167,69,.3);color:#28a745}@media (max-width: 768px){.tabs-header{flex-direction:column}.tab-btn{padding:12px 16px;font-size:.9rem}}@media (max-width: 600px){.library-header h1{font-size:1.5rem}.ebooks-grid{grid-template-columns:1fr}.expired-access-card{margin:30px 16px;padding:30px 20px}.tab-btn{font-size:.85rem;padding:10px 12px}.pdf-badge{font-size:.7rem;padding:3px 10px}}.ebook-expiration-info{font-size:.75rem;padding:6px 10px;background:#6b8e6b26;color:var(--text-secondary);border-radius:6px;margin-bottom:10px;text-align:center}.ebook-expiration-info.expired{background:#dc354526;color:#dc3545;font-weight:600}.btn:disabled{opacity:.6;cursor:not-allowed}.reader-page{display:flex;flex-direction:column;height:100vh;background:var(--bg-secondary);color:var(--text-primary);overflow:hidden}.reader-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:var(--bg-primary);border-bottom:1px solid var(--border-color);z-index:100}.reader-header-left,.reader-header-right{display:flex;align-items:center;gap:8px;min-width:150px}.reader-header-right{justify-content:flex-end}.reader-header-center{flex:1;display:flex;justify-content:center}.reader-back{display:flex;align-items:center;gap:8px;color:var(--text-secondary);text-decoration:none;font-size:.9rem;padding:8px 12px;border-radius:8px;transition:all .2s}.reader-back:hover{background:var(--bg-secondary);color:var(--accent-color)}.reader-back svg{width:18px;height:18px}.back-btn{display:flex;align-items:center;gap:8px;padding:8px 16px!important;font-size:.9rem;background:var(--accent-color)!important;color:#fff!important;border-radius:8px;margin-left:8px}.back-btn:hover{background:var(--accent-dark)!important}.back-btn svg{width:18px;height:18px}.back-btn span{font-size:.85rem;font-weight:500}.reader-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:transparent;border:1px solid var(--border-color);border-radius:8px;color:var(--text-secondary);cursor:pointer;transition:all .2s}.reader-btn:hover{background:var(--bg-secondary);color:var(--accent-color);border-color:var(--accent-color)}.reader-btn svg{width:20px;height:20px}.page-indicator{display:flex;align-items:baseline;gap:4px;background:var(--bg-secondary);border:2px solid var(--accent-color);border-radius:12px;padding:8px 20px;cursor:pointer;transition:all .2s}.page-indicator:hover{background:var(--accent-color)}.page-indicator:hover .current-page,.page-indicator:hover .separator,.page-indicator:hover .total-pages{color:#fff}.current-page{font-size:1.5rem;font-weight:700;color:var(--accent-color)}.separator{font-size:1.2rem;color:var(--text-secondary)}.total-pages{font-size:1rem;color:var(--text-secondary)}.reader-progress{height:3px;background:var(--border-color)}.reader-progress-bar{height:100%;background:linear-gradient(90deg,var(--accent-color),var(--accent-light));transition:width .3s ease}.reader-main{flex:1;display:flex;align-items:stretch;padding:10px;gap:10px;overflow:hidden}.nav-btn{display:flex;align-items:center;justify-content:center;width:40px;min-width:40px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;color:var(--text-primary);cursor:pointer;transition:all .2s}.nav-btn:hover:not(.disabled){background:var(--accent-color);border-color:var(--accent-color);color:#fff}.nav-btn.disabled{opacity:.3;cursor:not-allowed}.nav-btn svg{width:24px;height:24px}.page-wrapper{flex:1;display:flex;flex-direction:column;max-width:100%;width:100%;overflow:hidden}.page-container{flex:1;background:var(--bg-primary);border-radius:12px;box-shadow:0 2px 8px #0000001a;overflow-y:auto;overflow-x:hidden;position:relative;transition:transform .2s ease,opacity .2s ease}.page-container.transitioning-next{transform:translate(-20px);opacity:.5}.page-container.transitioning-prev{transform:translate(20px);opacity:.5}.page-content{padding:30px 35px;line-height:1.8;word-wrap:break-word;overflow-wrap:break-word}.page-loading{display:flex;align-items:center;justify-content:center;height:100%}.spinner{width:40px;height:40px;border:3px solid var(--border-color);border-top-color:var(--accent-color);border-radius:50%;animation:spin .8s linear infinite}.page-content h2{font-size:1.4em;color:var(--text-primary);margin:1.5em 0 .8em;padding-bottom:.4em;border-bottom:2px solid var(--accent-color)}.page-content p{margin:.7em 0;text-align:justify;line-height:1.8;color:var(--text-primary)}.page-content,.page-content td{color:var(--text-primary)}.page-content .code-lang{display:inline-block;background:var(--accent-color);color:#fff;padding:4px 12px;border-radius:6px 6px 0 0;font-size:.75em;font-weight:600;margin-bottom:-1px;position:relative;z-index:1}.page-content pre{background:#1e1e1e;color:#d4d4d4;padding:20px;border-radius:0 8px 8px;overflow-x:auto;margin:0 0 1.5em;font-family:JetBrains Mono,Fira Code,Consolas,monospace;font-size:.85em;line-height:1.6;border:1px solid #3a3a3a;max-width:100%}[data-theme=light] .page-content pre{background:#faf8ff;color:#1f1f2e;border-color:#e5e1f0}[data-theme=light] .page-content .code-lang{background:#7c3aed}.page-content pre code{display:block;white-space:pre-wrap;word-wrap:break-word}.page-content .concept-box{background:linear-gradient(135deg,#6b8e6b1f,#8aad8a0f);border:1px solid rgba(107,142,107,.25);border-left:4px solid #6B8E6B;padding:20px;border-radius:8px;margin:1.5em 0;line-height:1.7;color:var(--text-primary)}.page-content .concept-box strong{display:block;color:#5a7a5a;margin-bottom:10px;font-size:1.05em}[data-theme=dark] .page-content .concept-box{background:linear-gradient(135deg,#a855f726,#8b5cf614);border-color:#a855f74d;border-left-color:#a855f7}[data-theme=dark] .page-content .concept-box strong{color:#c4b5fd}.page-content .tip-box{background:linear-gradient(135deg,#22c55e1f,#22c55e0f);border:1px solid 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.5em;padding:8px;background:var(--bg-secondary);border-radius:6px;border-left:4px solid var(--accent-color)}.page-content .book-cover{display:flex;align-items:center;justify-content:center;min-height:60vh}.page-content .book-cover img{max-width:100%;max-height:70vh;border-radius:8px;box-shadow:0 8px 30px #0000004d}.page-content .diagram-image{text-align:center;margin:1em 0 1.5em;padding:15px;background:var(--bg-secondary);border-radius:10px;border:1px solid var(--border-color);position:relative;z-index:1;clear:both}.page-content .diagram-image img{max-width:100%;height:auto;border-radius:6px;box-shadow:0 2px 8px #0000001a;display:block;margin:0 auto}[data-theme=dark] .page-content .diagram-image img{filter:brightness(.95)}.protected-content{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}.protected-content img{-webkit-user-drag:none;-khtml-user-drag:none;-moz-user-drag:none;-o-user-drag:none;user-drag:none;pointer-events:none}.page-content 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16px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 20px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 40px rgba(0, 0, 0, .5);--shadow-glow: 0 0 30px var(--accent-glow);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "Fira Code", monospace;--transition: all .3s ease;--primary: var(--accent-color);--primary-dark: var(--accent-dark);--primary-light: var(--accent-light);--primary-glow: var(--accent-glow)}[data-theme=light]{--accent-color: #1e3a5f;--accent-dark: #152a45;--accent-light: #2d5a8a;--accent-glow: rgba(30, 58, 95, .25);--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-card: #ffffff;--bg-hover: #f0f4f8;--text-primary: #1e3a5f;--text-secondary: #3d5a80;--text-muted: #6b8cae;--border-color: #d1e3f0;--shadow-sm: 0 2px 8px rgba(30, 58, 95, .08);--shadow-md: 0 4px 20px rgba(30, 58, 95, .12);--shadow-lg: 0 8px 40px rgba(30, 58, 95, .15);--shadow-glow: 0 0 30px var(--accent-glow);--primary: var(--accent-color);--primary-dark: 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spin{to{transform:rotate(360deg)}}.grid{display:grid;gap:24px}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (max-width: 900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}@media (max-width: 600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.flex{display:flex}.flex-center{display:flex;align-items:center;justify-content:center}.flex-between{display:flex;align-items:center;justify-content:space-between}.flex-col{flex-direction:column}.gap-1{gap:8px}.gap-2{gap:16px}.gap-3{gap:24px}.text-center{text-align:center}.text-muted{color:var(--text-muted)}.text-sm{font-size:.875rem}.text-lg{font-size:1.125rem}.text-xl{font-size:1.25rem}.font-bold{font-weight:700}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}.page{min-height:100vh;display:flex;flex-direction:column}.page-content{flex:1;padding:40px 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.btn:hover{background:#fff3!important}.header .reader-btn{background:#ffffff1a!important;border:1px solid rgba(255,255,255,.2)!important;color:#fff!important}.user-avatar{width:36px;height:36px;background:var(--primary);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .5s ease forwards}@keyframes slideIn{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}.slide-in{animation:slideIn .3s ease forwards}.ebook-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);overflow:hidden;transition:var(--transition)}.ebook-card:hover{transform:translateY(-5px);border-color:var(--primary);box-shadow:var(--shadow-glow)}.ebook-cover{width:100%;height:280px;object-fit:cover;background:var(--bg-secondary)}.ebook-info{padding:20px}.ebook-title{font-size:1.1rem;font-weight:600;margin-bottom:8px;color:var(--text-primary)}.ebook-author{font-size:.9rem;color:var(--text-secondary);margin-bottom:16px}.ebook-progress{height:4px;background:var(--border-color);border-radius:2px;overflow:hidden;margin-bottom:8px}.ebook-progress-bar{height:100%;background:var(--primary);border-radius:2px;transition:width .3s ease}.ebook-progress-text{font-size:.8rem;color:var(--text-muted)}