:root{--transition-speed: .3s;--color-success: #4caf50;--color-warning: #ff9800;--color-info: #2196f3;--color-contact: #9c27b0;--accent-primary: #e44d26;--accent-primary-hover: #ff6b47}[data-theme=dark]{--bg-primary: #1c1c1c;--bg-secondary: #2a2a2a;--bg-tertiary: #222;--bg-gradient-start: #2a2a2a;--bg-gradient-end: #1a1a1a;--text-primary: #e0e0e0;--text-secondary: #ccc;--text-heading: #fff;--text-disabled: #555;--border-primary: #444;--border-secondary: #383838;--accent-primary-transparent: rgba(255, 0, 0, .3);--accent-border: rgba(255, 0, 0, .5);--accent-glow: rgba(255, 0, 0, .5);--shadow-color: rgba(0, 0, 0, .3);--shadow-strong-color: rgba(0, 0, 0, .4);--shadow-text-color: rgba(0, 0, 0, .7);--card-border-light-trans: rgba(255, 255, 255, .1);--card-bg-trans: rgba(42, 42, 42, .7);--spinner-base: rgba(255, 0, 0, .2);--spinner-top: var(--accent-primary);--card-sheen-gradient: linear-gradient( 135deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, 0) );--bg-overlay-dark: rgba(0, 0, 0, .8);--element-bg-hover: #3a3a3a;--color-success-bg: rgba(76, 175, 80, .15);--color-warning-bg: rgba(255, 152, 0, .15);--color-danger-bg: rgba(244, 67, 54, .15);--color-danger: #f44336;--color-open-source: #8b4513}[data-theme=light]{--bg-primary: #f4f4f4;--bg-secondary: #ffffff;--bg-tertiary: #e0e0e0;--bg-gradient-start: #ffffff;--bg-gradient-end: #f0f0f0;--text-primary: #333333;--text-secondary: #555555;--text-heading: #111111;--text-disabled: #aaaaaa;--border-primary: #cccccc;--border-secondary: #dddddd;--accent-primary-transparent: rgba(255, 0, 0, .15);--accent-border: rgba(255, 0, 0, .4);--accent-glow: rgba(255, 0, 0, .3);--shadow-color: rgba(0, 0, 0, .1);--shadow-strong-color: rgba(0, 0, 0, .15);--shadow-text-color: rgba(0, 0, 0, .2);--card-border-light-trans: rgba(0, 0, 0, .1);--card-bg-trans: rgba(255, 255, 255, .8);--spinner-base: rgba(255, 0, 0, .15);--spinner-top: var( --accent-primary );--card-sheen-gradient: linear-gradient( 135deg, rgba(0, 0, 0, .03), rgba(0, 0, 0, 0) );--bg-overlay-dark: rgba(244, 244, 244, .85);--element-bg-hover: #e8e8e8;--color-success-bg: rgba(76, 175, 80, .1);--color-warning-bg: rgba(255, 152, 0, .1);--color-danger-bg: rgba(244, 67, 54, .1);--color-danger: #d32f2f;--color-open-source: #795548}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;background-color:var(--bg-primary);color:var(--text-primary);transition:background-color var(--transition-speed) ease,color var(--transition-speed) ease}a{color:var(--accent-primary);text-decoration:none;transition:color var(--transition-speed) ease}a:hover{color:var(--accent-primary-hover)}h1,h2,h3{color:var(--text-heading);margin-bottom:.5em;font-weight:700}:root{--vertical-nav-width: 280px}.vertical-nav .logo-container{padding:0 .5rem;text-align:center}.vertical-nav .logo-link{display:inline-block;text-decoration:none}.vertical-nav .logo{height:40px;display:block;margin:0 auto .5rem}.vertical-nav .app-name{font-weight:700;color:var(--text-heading);text-align:center}.vertical-nav .main-nav{flex-grow:1;overflow-y:auto}.vertical-nav .main-nav ul{list-style:none;display:flex;flex-direction:column;gap:.5rem;height:100%;padding:1rem}.vertical-nav .main-nav a{display:flex;align-items:center;gap:1rem;padding:.85rem 1rem;border-radius:8px;font-weight:500;color:var(--text-secondary);transition:background-color .2s ease,color .2s ease}.vertical-nav .main-nav a:hover{background-color:var(--bg-primary);color:var(--text-heading)}.vertical-nav .main-nav li.active a{background-color:var(--accent-primary);color:#fff;font-weight:600}.vertical-nav .main-nav li.active a .material-symbols-outlined{color:#fff}.main-content-wrapper{margin-left:var(--vertical-nav-width);padding:0 2rem;transition:margin-left .3s ease;display:flex;flex-direction:column;min-height:100vh}.app-header{display:flex;justify-content:flex-end;align-items:center;padding:1rem 0;margin-bottom:2rem;border-bottom:1px solid var(--border-primary)}.header-left{display:none}.header-right{display:flex;align-items:center;gap:1rem}.user-menu{display:flex;align-items:center;gap:.5rem}.icon-button{background:none;border:none;cursor:pointer;color:var(--text-secondary);padding:.5rem;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background-color .2s ease,color .2s ease}.icon-button:hover{color:var(--text-heading);background-color:var(--element-bg-hover)}.mobile-menu-toggle{display:none;z-index:1001}.notes-container{padding:2rem;border-radius:12px;border:1px solid var(--border-primary);box-shadow:0 4px 12px #0000000d;transition:background .3s ease,border-color .3s ease}.main-content{background:linear-gradient(135deg,var(--bg-gradient-start),var(--bg-gradient-end));padding:2rem;border-radius:12px;box-shadow:0 4px 12px #0000000d;border:1px solid var(--border-primary);transition:background-color .3s ease,border-color .3s ease;flex-grow:1}.dashboard-header{margin-bottom:2rem;text-align:center}.dashboard-header h2{font-size:2rem;font-weight:800}.dashboard-header p{font-size:1.1rem;color:var(--text-secondary)}.stat-cards-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:2.5rem}.stat-card{background:linear-gradient(135deg,var(--bg-gradient-start),var(--bg-gradient-end));border:1px solid var(--border-primary);border-radius:12px;padding:1.5rem;display:flex;align-items:center;gap:1.5rem}.stat-card .material-symbols-outlined{font-size:2rem;color:var(--accent-primary);padding:.75rem;border-radius:50%;background-color:#007bff1a}.stat-info .stat-number{display:block;font-size:1.5rem;font-weight:700;color:var(--text-heading)}.stat-info .stat-label{font-size:.8rem;color:var(--text-secondary)}.action-cards-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}.action-card{background:linear-gradient(135deg,var(--bg-gradient-start),var(--bg-gradient-end));border:1px solid var(--border-primary);border-radius:12px;padding:2rem;text-align:center;text-decoration:none;transition:transform .2s ease,box-shadow .2s ease}.action-card:hover{transform:translateY(-5px);box-shadow:0 8px 24px #0000001a;text-decoration:none;color:var(--text-heading)}[data-theme=dark] .action-card:hover{box-shadow:0 8px 24px #0000004d}.action-card .material-symbols-outlined{font-size:3rem;color:var(--accent-primary);margin-bottom:1rem}.action-card h3{font-size:1.25rem;color:var(--text-heading);margin-bottom:.5rem}.action-card p{color:var(--text-secondary);font-size:.9rem}.action-card.action-card-highlight{background-color:var(--bg-primary);border:1px solid var(--accent-primary)}.action-card.action-card-highlight .material-symbols-outlined,.action-card.action-card-highlight h3{color:var(--accent-primary)}.action-card.action-card-highlight:hover{background-color:#ff00001a;transform:translateY(-5px);box-shadow:0 8px 24px #0000001a}[data-theme=dark] .action-card.action-card-highlight:hover{background-color:#ff000026}@media (max-width: 768px){.stat-cards-container{display:flex;overflow-x:auto;padding-bottom:1rem;scrollbar-width:none;-ms-overflow-style:none}.stat-cards-container::-webkit-scrollbar{display:none}.stat-cards-container .stat-card{flex:0 0 220px}}.page-header{border-bottom:1px solid var(--border-primary);margin-bottom:2rem;padding-bottom:1rem}.page-header h1{font-size:1.8rem;font-weight:800}.page-header p{color:var(--text-secondary);font-size:1rem;margin-top:.25rem}.upload-form .form-group{margin-bottom:1.5rem}.upload-form label{display:block;font-weight:600;margin-bottom:.5rem;color:var(--text-heading)}.upload-form input[type=text],.upload-form textarea,.upload-form select{width:100%;padding:.85rem 1rem;font-size:1rem;font-family:Inter,sans-serif;background-color:var( --color-background );border:1px solid var(--border-primary);border-radius:8px;color:var(--text-heading);transition:border-color .2s ease,box-shadow .2s ease}.upload-form input:focus,.upload-form textarea:focus,.upload-form select:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 3px #007bff26}.upload-form textarea{resize:vertical}.form-hint{font-size:.9rem;color:var(--text-secondary);margin-bottom:.5rem}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.85rem 1.5rem;font-size:1rem;font-weight:600;font-family:Inter,sans-serif;border:none;border-radius:8px;cursor:pointer;text-decoration:none;transition:background-color .2s ease,transform .1s ease}.btn:active{transform:scale(.98)}.btn-primary{background-color:var(--accent-primary);color:#fff}.btn-primary:hover{background-color:var(--accent-primary-hover);color:#fff;text-decoration:none}.form-messages{margin-bottom:1.5rem}.alert{padding:1rem;border-radius:8px;border:1px solid transparent;font-weight:500}.alert-success{background-color:#d1e7dd;color:#0f5132;border-color:#badbcc}.alert-error{background-color:#f8d7da;color:#842029;border-color:#f5c2c7}[data-theme=dark] .alert-success{background-color:#0f5132;color:#d1e7dd;border-color:#198754}[data-theme=dark] .alert-error{background-color:#842029;color:#f8d7da;border-color:#dc3545}.filter-bar{background-color:var(--bg-primary);padding:1.5rem;border-radius:12px;margin-bottom:2rem;border:1px solid var(--border-primary)}.filter-bar .btn-clear-filters{display:inline-flex;align-items:center;justify-content:center;padding:.6rem 1.8rem;border-radius:8px;text-decoration:none;font-weight:500;font-size:.9rem;cursor:pointer;transition:all .2s ease-in-out;background-color:transparent;border:1px solid var(--border-primary);color:var( --color-text-secondary )}.filter-bar .btn-clear-filters:hover,.filter-bar .btn-clear-filters:focus{background-color:#0000000a;color:var(--text-heading);border-color:#b0b0b0;transform:translateY(-1px);box-shadow:0 2px 4px #0000000d}[data-theme=dark] .filter-bar .btn-clear-filters:hover,[data-theme=dark] .filter-bar .btn-clear-filters:focus{background-color:#ffffff14;color:#fff;border-color:#777}.filter-form-container{display:block}#mobile-filter-toggle{display:none}.filter-form input[type=text],.filter-form select{flex-grow:1;min-width:150px;background-color:var(--bg-secondary);padding:.75rem 1rem;border:1px solid var(--border-primary);border-radius:8px;color:var(--text-heading);transition:border-color .2s ease,box-shadow .2s ease}.filter-form .btn-primary{flex-grow:0;align-items:center;justify-content:center}.document-list{display:grid;gap:1.5rem}.clickable{display:flex;text-decoration:none;color:inherit;transition:transform .2s ease-in-out,box-shadow .2s ease-in-out}.clickable:hover{transform:translateY(-4px);box-shadow:0 6px 16px #0000001f}.document-card-mobile .expand-toggle{position:relative;z-index:2}.document-card{background:linear-gradient(135deg,var(--bg-gradient-start),var(--bg-gradient-end));border:1px solid var(--border-primary);border-radius:12px;padding:1.5rem;display:flex;gap:1.5rem;transition:box-shadow .2s ease}.document-card:hover{box-shadow:0 4px 12px #00000014}[data-theme=dark] .document-card:hover{box-shadow:0 4px 12px #0003;border-color:var(--accent-primary)}.document-card-mobile{display:none}.doc-icon{flex-shrink:0}.doc-icon .material-symbols-outlined{font-size:2rem;color:var(--accent-primary)}.doc-details{flex-grow:1}.doc-title{font-size:1rem;font-weight:700;margin-bottom:.25rem}.doc-description{color:var(--text-secondary);font-size:.8rem;margin-bottom:1rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.doc-meta{display:flex;flex-wrap:wrap;gap:1rem;font-size:.85rem;color:var(--text-secondary)}.doc-meta span{display:inline-flex;align-items:center;gap:.3rem}.doc-meta .material-symbols-outlined{font-size:1rem}.doc-actions{flex-shrink:0;text-align:right;display:flex;flex-direction:column;justify-content:space-between;align-items:flex-end}.doc-actions .file-size{font-size:.9rem;font-weight:500;color:var(--text-secondary);margin-bottom:.5rem}.doc-actions .btn{padding:.6rem 1rem}.doc-actions .btn .material-symbols-outlined{font-size:1.2rem}.doc-info-bar{font-size:.8rem;color:var(--text-secondary);margin-top:1rem}.no-results-card{background-color:var(--bg-primary);border:2px 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#dc3545}.btn-danger:hover{background-color:#dc3545;color:#fff;text-decoration:none}.auth-page-body{display:flex;justify-content:center;align-items:center;min-height:100vh;background-color:var(--bg-primary)}.auth-container{max-width:450px;width:100%;padding:2rem}.auth-logo{display:flex;justify-content:center;align-items:center;gap:.75rem;text-decoration:none;margin-bottom:2rem}.auth-logo h1{font-size:1.8rem;color:var(--text-heading);margin:0}.auth-logo .material-symbols-outlined{font-size:2.5rem;color:var(--accent-primary)}.auth-card{background:linear-gradient(135deg,var(--bg-gradient-start),var(--bg-gradient-end));padding:2rem 2.5rem;border-radius:12px;border:1px solid var(--border-primary);box-shadow:0 4px 24px #0000000d}[data-theme=dark] .auth-card{box-shadow:0 4px 24px #0003}.auth-card form{display:flex;flex-direction:column;gap:1.5rem}.auth-card input[type=email],.auth-card input[type=password],.auth-card input[type=text]{width:100%;padding:.85rem 1rem;font-size:1rem;font-family:Inter,sans-serif;background-color:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:8px;color:var(--text-heading);transition:border-color .2s ease,box-shadow .2s ease}.auth-card input:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 3px #007bff26}.auth-card input::placeholder{color:var(--text-secondary)}.auth-card .form-group{display:flex;flex-direction:column;gap:.5rem}.auth-card .form-group label{font-weight:600;color:var(--text-heading)}.auth-card .form-group .form-hint{font-size:.9rem;color:var(--text-secondary)}.auth-card .form-group .form-hint a{color:var(--accent-primary);text-decoration:none}.auth-card .form-group .form-hint a:hover{color:var(--accent-primary-hover);text-decoration:underline}.auth-card .form-group .form-hint a:focus{outline:none;color:var(--accent-primary-hover)}.auth-card .form-group .form-hint a:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}.auth-card .form-group .form-hint a:focus:not(:focus-visible){outline:none}.auth-card h2{text-align:center;font-size:1.6rem;margin-bottom:.5rem}.auth-card p{text-align:center;color:var(--text-secondary);margin-bottom:2rem}.auth-form .btn{width:100%;justify-content:center;padding-top:1rem;padding-bottom:1rem;font-size:1.1rem}.auth-footer{text-align:center;margin-top:1.5rem;font-size:.9rem}.email-simulation{margin-top:1.5rem;padding:1rem;background-color:var(--bg-primary);border-radius:8px;border:1px solid var(--border-primary)}.email-simulation h4{margin-bottom:.5rem}.email-simulation p{font-size:.9rem;text-align:left;margin-bottom:1rem}.reset-link-box{width:100%;padding:.75rem;font-family:monospace;font-size:.9rem;background-color:var(--bg-secondary);color:var(--text-heading);border:1px solid var(--border-primary);border-radius:4px;resize:none;word-break:break-all}.app-footer{text-align:center;padding:2rem 0;margin-top:2rem;color:var(--text-secondary);font-size:.9rem}@media (max-width: 768px){.main-content-wrapper{margin-left:0;padding:0 .2rem}.main-content{padding:1rem}.vertical-nav{width:300px;transform:translate(-100%);box-shadow:0 0 20px #0003}.vertical-nav.is-open{transform:translate(0)}.vertical-nav.is-open+.main-content-wrapper .mobile-menu-toggle{position:fixed;top:0;right:0;padding:1rem}.mobile-menu-toggle{display:flex;transition:transform .3s ease}.app-header{justify-content:space-between}.notes-container .document-card{display:none}.document-card-mobile{display:flex;align-items:flex-start;gap:1rem;padding:1rem;background-color:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:12px;text-decoration:none;color:inherit}.document-card-mobile .doc-icon .material-symbols-outlined{font-size:2.5rem;color:var(--accent-primary);margin-top:-2px}.document-card-mobile .doc-details{flex:1;display:flex;flex-direction:column;gap:.75rem}.document-card-mobile .doc-title{font-size:1.1rem;font-weight:600;line-height:1.3;margin:0;color:var(--text-heading)}.document-card-mobile .doc-meta,.document-card-mobile .doc-info-bar{display:flex;flex-wrap:wrap;gap:.5rem 1rem;font-size:.8rem;color:var(--text-secondary)}.document-card-mobile .doc-meta span,.document-card-mobile .doc-info-bar span{display:flex;align-items:center;gap:.3rem}.document-card-mobile .doc-meta .material-symbols-outlined,.document-card-mobile .doc-info-bar .material-symbols-outlined{font-size:1rem}.doc-actions{flex-shrink:0;display:flex;gap:.5rem}.doc-actions .btn.btn-primary{background:none;padding:.5rem;border-radius:50%;min-width:0;color:var(--accent-primary)}.doc-actions .btn.btn-primary:hover{background-color:#0000000d;color:var(--accent-primary-hover)}[data-theme=dark] .doc-actions .btn.btn-primary:hover{background-color:#ffffff1a}.doc-actions .btn .download-text,.filter-form-container{display:none}.filter-form-container.active{display:block;margin-top:1rem;animation:slideDown .5s ease-out}#mobile-filter-toggle{display:flex;width:100%;justify-content:center}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.profile-container .document-card{flex-direction:row;flex-wrap:wrap;align-items:center;padding:1rem}.profile-container .doc-details{flex-grow:1}.profile-container .doc-actions{flex-direction:row;gap:.75rem}.profile-container .doc-meta{display:none}.input-with-button-container{display:flex;align-items:center;gap:10px}.input-with-button-container select{flex-grow:1}.btn-add-new{padding:5px 10px;border:1px solid #ccc;background-color:#f0f0f0;cursor:pointer;white-space:nowrap;border-radius:4px}.btn-add-new:hover{background-color:#e0e0e0}.add-new-container{display:flex;gap:10px}.add-new-container input[type=text]{flex-grow:1}.filter-form{flex-direction:column;align-items:stretch}.filter-form input[type=text],.filter-form select{width:100%}.filter-buttons{display:flex;gap:2rem;margin-top:1rem;width:100%}.filter-buttons .btn-primary{flex-grow:1;margin:0;padding:0 .75rem}.filter-buttons .btn,.filter-buttons .btn-clear-filters{flex-grow:1;justify-content:center;text-align:center}}.login-container{display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:75vh;padding:2rem 1rem;width:100%}.login-card{background-color:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:16px;padding:2.5rem 3rem;max-width:450px;width:100%;text-align:center;box-shadow:0 10px 25px -5px #0000000a;animation:fadeIn .6s ease-out}[data-theme=dark] .login-card{box-shadow:0 10px 25px -5px #00000026}.login-logo{width:60px;height:60px;margin:0 auto 1.5rem}.login-card h2{font-size:1.75rem;font-weight:700;color:var(--text-heading);margin-bottom:.75rem}.login-card p{color:var(--text-secondary);line-height:1.6;margin-bottom:2.5rem}.btn-google{display:inline-flex;align-items:center;justify-content:center;width:100%;padding:12px 24px;font-size:1rem;font-weight:600;border-radius:8px;border:1px solid var(--border-primary);background-color:var(--bg-secondary);color:var(--text-heading);cursor:pointer;transition:all .2s ease-in-out;gap:12px}.btn-google:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001a;background-color:var(--color-surface-hover);border:1px solid var(--color-border-hover)}[data-theme=dark] .btn-google:hover{box-shadow:0 4px 12px #0003}.btn-google img{width:20px;height:20px}.login-footer-note{font-size:.8rem;color:var(--text-secondary);margin-top:2rem;margin-bottom:0}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 768px){.login-card{padding:2rem 1.5rem}.login-card h2{font-size:1.5rem}}body.body-no-scroll{overflow:hidden}body.body-no-scroll .app-container{height:calc(var(--vh, 1vh) * 100);display:flex;flex-direction:column}body.body-no-scroll .main-content{flex-grow:1;display:flex;flex-direction:column;padding:0}body.body-no-scroll .main-content>.chat-page-container{flex-grow:1}body.body-no-scroll .chat-fab{display:none}.chat-fab{position:fixed;bottom:2rem;right:2rem;width:60px;height:60px;background-color:var(--accent-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px #0003;text-decoration:none;transition:all .2s ease-in-out;z-index:1000}.chat-fab:hover{transform:scale(1.1);box-shadow:0 6px 16px #0000004d;color:#fff}.chat-fab .material-symbols-outlined{font-size:2rem}.app-promo-banner{display:flex;align-items:center;gap:1rem;padding:.75rem 1.5rem;background:linear-gradient(135deg,var(--accent-primary),var(--accent-primary-hover));border:none;border-radius:12px;margin-bottom:2rem;position:relative;overflow:hidden;transition:all .4s ease-in-out;box-shadow:0 4px 15px -5px #5271ff4d}.school-selectors{display:flex;gap:1rem;width:100%;margin-bottom:1rem}.school-selectors select{flex-grow:1;min-width:150px;background-color:var(--bg-secondary);padding:.75rem 1rem;border:1px solid var(--border-primary);border-radius:8px;color:var(--text-heading)}.school-selectors select:disabled{background-color:var(--bg-tertiary);cursor:not-allowed}.filter-form{display:flex;flex-wrap:wrap;align-items:center;gap:1rem}.filter-main-row{display:flex;flex-wrap:wrap;gap:1rem}.filter-main-row input[type=text],.filter-main-row select{flex-grow:1}.choices{flex-grow:1;min-width:200px;margin-bottom:0}.choices__inner{background-color:var(--bg-secondary);border:1px solid var(--border-primary);color:var(--text-heading);padding:.6rem 1rem!important;border-radius:8px;font-size:1rem;min-height:auto}.is-focused .choices__inner,.is-open .choices__inner{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-primary-transparent)}.choices__list--dropdown,.choices__list[aria-expanded]{background-color:var(--bg-secondary);border:1px solid var(--accent-border);border-radius:8px}.choices__input{background-color:transparent!important;color:var(--text-heading)!important}.choices__item--choice{color:var(--text-secondary)}.choices__item--choice.is-highlighted{background-color:var(--element-bg-hover)!important;color:var(--text-heading)!important}.choices__placeholder{color:var(--text-secondary)}@media (max-width: 768px){.school-selectors{flex-direction:column}}.app-promo-banner.hidden{opacity:0;height:0;padding-top:0;padding-bottom:0;margin-bottom:0;border-width:0;box-shadow:none}.promo-icon .material-symbols-outlined{font-size:3.5rem;color:#fff;opacity:.8}.promo-text{flex-grow:1}.promo-text h3{margin:0 0 .25rem;font-size:1.3rem;font-weight:700;color:#fff}.promo-text p{margin:0;font-size:.95rem;color:#ffffffd9;line-height:1.5;max-width:450px}.promo-cta{margin-left:auto}.promo-cta img{height:48px;width:auto;transition:transform .2s ease}.promo-cta a:hover img{transform:scale(1.05)}.promo-close-btn{position:absolute;top:.75rem;right:.75rem;background:#0003;border:none;cursor:pointer;color:#fffc;padding:.35rem;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.promo-close-btn:hover{background:#0006;color:#fff}@media (max-width: 768px){.app-promo-banner{flex-direction:column;align-items:center;text-align:center;gap:1.25rem;padding:2rem 1.5rem}.promo-icon{display:block}.promo-icon .material-symbols-outlined{font-size:3rem}.promo-text p{max-width:100%}.promo-cta{margin-left:0;margin-top:.5rem}}@media (max-width: 768px){.hide-on-mobile{display:none!important}}#loading-indicator{display:flex;justify-content:center;align-items:center;padding:2rem 0;width:100%}.spinner{width:40px;height:40px;border:4px solid var(--border-primary);border-top-color:var(--accent-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.vertical-nav .main-nav .nav-heading{font-size:.75rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;padding:1rem 1rem .5rem}.vertical-nav .main-nav .nav-divider{margin:1rem 0}.vertical-nav .main-nav .nav-divider hr{border:none;border-top:1px solid var(--border-primary)}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--accent-primary);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:var(--accent-primary-hover)}*{scrollbar-width:thin;scrollbar-color:var(--accent-primary) var(--bg-primary)}.library-container{width:100%;max-width:1400px;margin:2rem auto;padding:0 1.5rem}.page-header{margin-bottom:3rem;text-align:center}.page-header h1{font-size:2.5rem;font-weight:700;color:var(--text-heading);margin-bottom:.75rem;background:linear-gradient(135deg,var(--text-heading),var(--accent-primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.page-header p{font-size:1.125rem;color:var(--text-secondary);max-width:600px;margin:0 auto;line-height:1.6}.library-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:2rem;margin-top:2rem}.library-card{background:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:16px;box-shadow:0 4px 20px #00000014;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column;overflow:hidden;position:relative;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.library-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent-primary),var(--accent-primary-hover));opacity:0;transition:opacity .3s ease}.library-card:hover{transform:translateY(-8px);box-shadow:0 12px 40px #00000026;border-color:var(--accent-border)}.library-card:hover:before{opacity:1}.library-card .card-icon{color:#fff;padding:2rem;display:flex;justify-content:center;align-items:center;position:relative;overflow:hidden}.library-card .card-icon:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.1) 0%,transparent 70%);transform:scale(0);transition:transform .6s ease}.library-card:hover .card-icon:before{transform:scale(1)}.library-card .card-icon .material-symbols-outlined{font-size:32px;position:relative;z-index:1}.library-card .card-content{padding:2rem;flex-grow:1;display:flex;flex-direction:column;position:relative}.library-card .card-content h4{font-size:1.375rem;font-weight:700;margin:0 0 1rem;color:var(--text-heading);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.library-card .card-content p{font-size:1rem;color:var(--text-secondary);line-height:1.6;flex-grow:1;margin-bottom:2rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.library-card .card-footer{padding:1.5rem 2rem;background:var(--bg-primary);border-top:1px solid var(--border-secondary);display:flex;justify-content:space-between;align-items:center;gap:1rem}.library-card .view-button{display:inline-flex;align-items:center;gap:.5rem;background:linear-gradient(135deg,var(--accent-primary),var(--accent-primary-hover));color:#fff;padding:.75rem 1.5rem;border-radius:10px;text-decoration:none;font-weight:600;font-size:.95rem;transition:all .3s ease;box-shadow:0 2px 10px #e44d264d;position:relative;overflow:hidden}.library-card .view-button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s ease}.library-card .view-button:hover{transform:translateY(-2px);box-shadow:0 4px 20px #e44d2666}.library-card .view-button:hover:before{left:100%}.access-badge{font-size:.75rem;font-weight:700;padding:.5rem 1rem;border-radius:20px;text-transform:uppercase;letter-spacing:.5px;display:inline-flex;align-items:center;gap:.375rem;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border:1px solid transparent}.access-badge:before{content:"";width:6px;height:6px;border-radius:50%;display:block}.access-badge.free{background:var(--color-success-bg);color:var(--color-success);border-color:#4caf5033}.access-badge.free:before{background:var(--color-success)}.access-badge.paid{background:var(--color-warning-bg);color:var(--color-warning);border-color:#ff980033}.access-badge.paid:before{background:var(--color-warning)}.empty-library{text-align:center;padding:5rem 2rem;background:var(--bg-secondary);border-radius:24px;border:2px dashed var(--border-primary);max-width:600px;margin:3rem auto;position:relative;overflow:hidden}.empty-library:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,var(--accent-primary-transparent) 0%,transparent 70%);opacity:.3;animation:pulse 4s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(.8);opacity:.1}50%{transform:scale(1.2);opacity:.3}}.empty-library .material-symbols-outlined{font-size:80px;color:var(--text-secondary);opacity:.7;position:relative;z-index:1}.empty-library h2{font-size:2rem;font-weight:700;color:var(--text-heading);margin-top:2rem;margin-bottom:1rem;position:relative;z-index:1}.empty-library p{color:var(--text-secondary);font-size:1.125rem;line-height:1.6;max-width:400px;margin:0 auto 2.5rem;position:relative;z-index:1}.empty-library .browse-button{display:inline-flex;align-items:center;gap:.5rem;background:linear-gradient(135deg,var(--accent-primary),var(--accent-primary-hover));color:#fff;padding:1rem 2rem;border-radius:12px;text-decoration:none;font-weight:600;font-size:1.05rem;transition:all .3s ease;box-shadow:0 4px 20px #e44d264d;position:relative;z-index:1}.empty-library .browse-button:hover{transform:translateY(-3px);box-shadow:0 6px 30px #e44d2666}@media (max-width: 768px){.library-container{padding:0 1rem;margin:1.5rem auto}.page-header{margin-bottom:2rem}.page-header h1{font-size:2rem}.page-header p{font-size:1rem}.library-grid{grid-template-columns:1fr;gap:1.5rem;margin-top:1.5rem}.library-card .card-content{padding:1.5rem}.library-card .card-footer{padding:1.25rem 1.5rem;flex-direction:column;gap:1rem;align-items:stretch}.library-card .view-button{justify-content:center}.empty-library{padding:3rem 1.5rem;margin:2rem auto}.empty-library h2{font-size:1.75rem}}.document-card-mobile{overflow-x:hidden}.doc-details{word-wrap:break-word}@media (max-width: 768px){.document-card{display:none}}@media (min-width: 769px){.document-card-mobile{display:none}}.filter-form{display:flex;flex-wrap:wrap;gap:1rem}.filter-row{display:flex;flex-grow:1;gap:1rem}.filter-row.full-width,.filter-row.full-width .choices{width:100%}.filter-row.multi-column{flex-wrap:wrap}.filter-row.multi-column>*{flex:1 1 180px}.filter-buttons{display:flex;align-items:center;gap:.5rem}.filter-buttons .btn.btn-primary{padding:.6rem 1.8rem;border-radius:8px;font-size:.9rem;font-weight:500}.vertical-nav{position:fixed;left:0;top:0;height:100vh;width:var(--vertical-nav-width);background:linear-gradient(135deg,#0f172af2,#1e293bf2,#0f172af2);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-right:1px solid rgba(148,163,184,.1);z-index:1000;transition:all .4s cubic-bezier(.25,.8,.25,1);overflow:hidden;box-shadow:0 25px 50px -12px #00000040,0 0 0 1px #ffffff0d;padding:1.5rem 0rem;gap:2rem}[data-theme=light] .vertical-nav{background:linear-gradient(135deg,#f8fafcf2,#f1f5f9f2,#f8fafcf2);border-right:1px solid rgba(148,163,184,.2);box-shadow:0 25px 50px -12px #0000001a,0 0 0 1px #0000000d}.vertical-nav:before{content:"";position:absolute;top:0;left:0;right:0;height:200px;background:linear-gradient(135deg,#3b82f61a,#9333ea1a,#ec48991a);animation:gradient-shift 8s ease-in-out infinite;opacity:.7}@keyframes gradient-shift{0%,to{transform:translate(-10px) scale(1);opacity:.7}50%{transform:translate(10px) scale(1.05);opacity:.9}}.logo-container{position:relative;padding:2rem 1.5rem 1.5rem;border-bottom:1px solid rgba(148,163,184,.1);background:#ffffff05;z-index:2}.logo-link{display:flex;align-items:center;gap:.75rem;text-decoration:none;transition:all .3s ease}.logo-link:hover{transform:translate(4px)}.logo{width:40px;height:40px;border-radius:12px;box-shadow:0 8px 25px #3b82f64d;transition:all .3s ease}.logo:hover{transform:scale(1.1) rotate(5deg);box-shadow:0 12px 35px #3b82f680}.app-name{font-size:1.25rem;font-weight:700;color:var(--text-heading);margin:0;background:linear-gradient(135deg,#3b82f6,#8b5cf6,#ec4899);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:-.025em}.main-nav{padding:1rem 0;height:calc(100vh - 120px);overflow-y:auto;overflow-x:hidden;position:relative;z-index:2}.main-nav::-webkit-scrollbar{width:4px}.main-nav::-webkit-scrollbar-track{background:#94a3b81a;border-radius:2px}.main-nav::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#3b82f6,#8b5cf6);border-radius:2px}.main-nav::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,#2563eb,#7c3aed)}.main-nav ul{list-style:none;padding:0;margin:0}.main-nav li{margin:.25rem 0;position:relative}.main-nav li a{display:flex;align-items:center;gap:.875rem;padding:.875rem 1.5rem;color:#94a3b8e6;text-decoration:none;font-weight:500;font-size:.925rem;transition:all .3s cubic-bezier(.25,.8,.25,1);position:relative;overflow:hidden;border-radius:0 25px 25px 0;margin-right:1rem}.main-nav li a:before{content:"";position:absolute;left:0;top:0;bottom:0;width:0;background:linear-gradient(135deg,#3b82f633,#9333ea33);transition:width .3s ease;z-index:-1}.main-nav li a:hover:before{width:100%}.main-nav li a:hover{color:#fff;transform:translate(8px);background:#ffffff0d;box-shadow:0 8px 25px #3b82f633}.main-nav li.active a{color:#fff;background:linear-gradient(135deg,#3b82f64d,#9333ea4d);border-left:4px solid #3b82f6;box-shadow:0 8px 25px #3b82f64d,inset 0 1px #ffffff1a}.main-nav li.active a:after{content:"";position:absolute;right:0;top:50%;transform:translateY(-50%);width:4px;height:20px;background:linear-gradient(135deg,#3b82f6,#8b5cf6);border-radius:2px 0 0 2px}.main-nav li a .material-symbols-outlined,.main-nav li a i{font-size:1.375rem;transition:all .3s ease;opacity:.9}.main-nav li a:hover .material-symbols-outlined,.main-nav li a:hover i{opacity:1;transform:scale(1.1)}.main-nav li.active a .material-symbols-outlined,.main-nav li.active a i{color:#60a5fa;opacity:1}.nav-divider hr{border:none;height:1px;background:linear-gradient(90deg,transparent,rgba(148,163,184,.2) 20%,rgba(148,163,184,.2) 80%,transparent);margin:1rem 1.5rem}.nav-heading{padding:1rem 1.5rem .5rem;color:#94a3b899;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.main-nav li a[href*=facebook],.main-nav li a[href*=telegram]{background:#ffffff05}.main-nav li a[href*=facebook]:hover{background:linear-gradient(135deg,#1877f233,#1877f21a);color:#1877f2}.main-nav li a[href*=telegram]:hover{background:linear-gradient(135deg,#08c3,#0088cc1a);color:#08c}.main-nav ul>a[href*="opers.co"]{display:flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;color:#94a3b880;text-decoration:none;font-size:.8rem;font-weight:500;margin-top:auto;border-top:1px solid rgba(148,163,184,.1);background:#0000001a;transition:all .3s ease}.main-nav ul>a[href*="opers.co"]:hover{color:#94a3b8cc;background:#0003}@media (max-width: 768px){.vertical-nav{transform:translate(-100%);width:280px}.vertical-nav.active{transform:translate(0)}.vertical-nav.active:after{content:"";position:fixed;top:0;left:280px;width:calc(100vw - 280px);height:100vh;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:-1}}@media (max-width: 1024px){.vertical-nav{width:260px}.main-nav li a{padding:.75rem 1.25rem;font-size:.9rem}.logo-container{padding:1.5rem 1.25rem 1.25rem}}[data-theme=light] .vertical-nav:before{background:linear-gradient(135deg,#3b82f60d,#9333ea0d,#ec48990d)}[data-theme=light] .logo-container{background:#00000005;border-bottom:1px solid rgba(0,0,0,.1)}[data-theme=light] .main-nav li a{color:#334155cc}[data-theme=light] .main-nav li a:hover{color:#0f172a;background:#3b82f61a}[data-theme=light] .main-nav li.active a{background:linear-gradient(135deg,#3b82f626,#9333ea26);color:#0f172a}[data-theme=light] .nav-heading{color:#33415599}[data-theme=light] .nav-divider hr{background:linear-gradient(90deg,transparent,rgba(0,0,0,.1) 20%,rgba(0,0,0,.1) 80%,transparent)}@keyframes slideInLeft{0%{transform:translate(-100%);opacity:0}to{transform:translate(0);opacity:1}}.vertical-nav{animation:slideInLeft .6s cubic-bezier(.25,.8,.25,1)}.main-nav li.active a{position:relative}.main-nav li.active a:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,#3b82f61a,#9333ea1a);border-radius:inherit;z-index:-1;filter:blur(8px)}.books-page{max-width:100%;margin:0;padding:0 2rem}.books-page .page-header{text-align:center;margin-bottom:3rem}.books-page .page-header h1{font-size:2.5rem;font-weight:800;background:linear-gradient(135deg,var(--accent-primary),var(--accent-primary-hover));-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:.5rem}.books-page .page-header p{font-size:1.1rem;color:var(--text-secondary);max-width:600px;margin:0 auto}.category-filter{display:flex;flex-wrap:wrap;gap:.75rem;margin-bottom:2.5rem;padding:1.5rem;background-color:var(--bg-secondary);border-radius:12px;border:1px solid var(--border-primary)}.category-link{display:inline-flex;align-items:center;padding:.65rem 1.2rem;border-radius:25px;background-color:var(--bg-primary);color:var(--text-secondary);text-decoration:none;font-weight:500;font-size:.9rem;border:1px solid var(--border-primary);transition:all .3s ease}.category-link:hover{background-color:var(--element-bg-hover);color:var(--text-heading);transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.category-link.active{background:linear-gradient(135deg,var(--accent-primary),var(--accent-primary-hover));color:#fff;border-color:var(--accent-primary)}.category-link.child{margin-left:1rem;background-color:var(--bg-tertiary);font-size:.85rem}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:2rem;margin-bottom:3rem}.book-card{background-color:var(--bg-secondary);border-radius:16px;overflow:hidden;box-shadow:0 4px 20px #00000014;border:1px solid var(--border-primary);transition:all .3s cubic-bezier(.25,.8,.25,1);position:relative}.book-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--accent-primary),var(--accent-primary-hover));opacity:0;transition:opacity .3s ease}.book-card:hover{transform:translateY(-8px);box-shadow:0 12px 35px #00000026}.book-card:hover:before{opacity:1}[data-theme=dark] .book-card:hover{box-shadow:0 12px 35px #0000004d}.book-card a{display:block;text-decoration:none;color:inherit;height:100%}.book-cover{width:100%;height:320px;object-fit:cover;transition:transform .3s ease}.book-card:hover .book-cover{transform:scale(1.05)}.book-card-content{padding:1.5rem}.book-title{font-size:1.1rem;font-weight:700;color:var(--text-heading);margin-bottom:.5rem;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.book-author{color:var(--text-secondary);font-size:.9rem;font-weight:500;margin:0}.pagination{display:flex;justify-content:center;margin-top:3rem}.pagination ul{display:flex;list-style:none;gap:.5rem;padding:0;margin:0}.pagination li a{display:flex;align-items:center;justify-content:center;min-width:44px;height:44px;padding:0 .75rem;background-color:var(--bg-secondary);color:var(--text-secondary);text-decoration:none;border-radius:8px;border:1px solid var(--border-primary);font-weight:500;transition:all .2s ease}.pagination li a:hover{background-color:var(--element-bg-hover);color:var(--text-heading);transform:translateY(-1px)}.pagination li a.active{background:linear-gradient(135deg,var(--accent-primary),var(--accent-primary-hover));color:#fff;border-color:var(--accent-primary)}@media (max-width: 768px){.book-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1.5rem}.category-filter{flex-direction:column;gap:.5rem}.category-link.child{margin-left:0}}.book-details-page{max-width:1200px;margin:0 auto}.book-details-header{display:grid;grid-template-columns:300px 1fr;gap:3rem;margin-bottom:3rem;padding:2rem;background-color:var(--bg-secondary);border-radius:16px;border:1px solid var(--border-primary);box-shadow:0 8px 25px #0000001a}[data-theme=dark] .book-details-header{box-shadow:0 8px 25px #0003}.book-cover-large{width:100%;height:400px;object-fit:cover;border-radius:12px;box-shadow:0 12px 30px #00000026;transition:transform .3s ease}.book-cover-large:hover{transform:scale(1.02)}.book-details-info{display:flex;flex-direction:column;justify-content:center;gap:1rem}.book-details-info h1{font-size:2.5rem;font-weight:800;color:var(--text-heading);line-height:1.2;margin:0}.book-details-info h2{font-size:1.5rem;font-weight:600;color:var(--text-secondary);margin:0}.book-details-info .category{font-size:1rem;color:var(--text-secondary);margin:.5rem 0}.book-details-info .category a{color:var(--accent-primary);text-decoration:none;font-weight:600;padding:.25rem .75rem;background-color:rgba(var(--accent-primary),.1);border-radius:20px;transition:all .2s ease}.book-details-info .category a:hover{background-color:var(--accent-primary);color:#fff}.book-details-info .btn{align-self:flex-start;padding:1rem 2rem;font-size:1.1rem;font-weight:600;margin-top:1rem;border-radius:50px;box-shadow:0 4px 15px #0003;transition:all .3s ease}.book-details-info .btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px #0000004d}.book-description{background-color:var(--bg-secondary);padding:2rem;border-radius:12px;border:1px solid var(--border-primary)}.book-description h3{font-size:1.5rem;font-weight:700;color:var(--text-heading);margin-bottom:1rem;border-bottom:2px solid var(--accent-primary);padding-bottom:.5rem;display:inline-block}.book-description p{font-size:1.1rem;line-height:1.7;color:var(--text-primary);margin:0}@media (max-width: 768px){.book-details-header{grid-template-columns:1fr;gap:2rem;text-align:center}.book-cover-large{height:300px;max-width:200px;margin:0 auto}.book-details-info h1{font-size:2rem}.book-details-info h2{font-size:1.25rem}.book-details-info .btn{align-self:center}.book-description{padding:1.5rem}}@media (max-width: 480px){.book-details-info h1{font-size:1.75rem}.book-cover-large{height:250px;max-width:170px}}.featured-categories-section{margin-bottom:2rem}.category-pills{display:flex;flex-wrap:wrap;gap:.5rem}.category-pill{display:inline-block;padding:.5rem 1rem;border-radius:9999px;background-color:var(--bg-secondary, #eee);color:var(--text-primary, #333);text-decoration:none;transition:all .3s ease;border:1px solid transparent}.category-pill:hover{background-color:var(--bg-tertiary, #ddd);transform:translateY(-2px);box-shadow:0 2px 8px #0000001a}.category-pill.view-all{background-color:var(--accent-primary, #007bff);color:#fff}.category-pill.view-all:hover{opacity:.9;transform:translateY(-2px);box-shadow:0 2px 12px #0003}[data-theme=dark] .category-pill{background-color:#ffffff1a;color:var(--text-primary);border:1px solid rgba(255,255,255,.1)}[data-theme=dark] .category-pill:hover{background-color:#ffffff26;border-color:#fff3}[data-theme=dark] .category-pill.view-all{background-color:var(--accent-primary);border-color:var(--accent-primary)}[data-theme=light] .category-pill{background-color:#f0f0f0;color:#333;border:1px solid #e0e0e0}[data-theme=light] .category-pill:hover{background-color:#e0e0e0;border-color:#d0d0d0}[data-theme=light] .category-pill.view-all{background-color:var(--accent-primary, #007bff);border-color:var(--accent-primary, #007bff)}:root{--vertical-nav-collapsed-width: 100px}.sidebar-toggle{position:fixed;left:var(--vertical-nav-width);top:20px;transform:translate(-50%);background:#3b82f61a;border:1px solid rgba(59,130,246,.3);border-radius:50%;color:var(--text-secondary);cursor:pointer;padding:8px;font-size:16px;display:flex;align-items:center;justify-content:center;transition:all .3s ease;z-index:1010;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 2px 10px #0000001a}.sidebar-toggle:hover{background:#3b82f633;color:var(--text-heading);transform:scale(1.05)}.vertical-nav.collapsed{width:var(--vertical-nav-collapsed-width)}.main-content-wrapper.sidebar-collapsed{margin-left:var(--vertical-nav-collapsed-width)}.vertical-nav.collapsed .app-name{display:none}.vertical-nav.collapsed .main-nav a{justify-content:center;padding:1rem .5rem;position:relative}.vertical-nav.collapsed .main-nav a>*:not(.material-symbols-outlined):not(.fab):not(.fa-solid){display:none!important}.vertical-nav.collapsed .main-nav 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.material-symbols-outlined{display:block!important;font-size:20px!important;line-height:1!important;margin:0!important;position:absolute!important;top:50%!important;left:50%!important;transform:translate(-50%,-50%)!important}.vertical-nav.collapsed .main-nav li a .fab,.vertical-nav.collapsed .main-nav li a .fa-solid{display:block!important;font-size:18px!important;line-height:1!important;margin:0!important;position:absolute!important;top:50%!important;left:50%!important;transform:translate(-50%,-50%)!important}.vertical-nav.collapsed{width:90px!important;min-width:90px!important}.main-content-wrapper.sidebar-collapsed{margin-left:70px!important}.main-content-wrapper.sidebar-collapsed .sidebar-toggle{left:70px!important}.vertical-nav.collapsed{width:100px!important;min-width:100px!important;overflow:visible!important}.vertical-nav.collapsed .main-nav{padding:1rem .5rem!important;overflow:visible!important}.vertical-nav.collapsed .main-nav li{margin:8px 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.sidebar-toggle{left:20px!important;transform:translate(0)!important}@media (max-width: 768px){#sidebar-toggle,.sidebar-toggle{display:none!important}}@media (min-width: 769px){#sidebar-toggle,.sidebar-toggle{display:flex!important}}.vertical-nav.collapsed~.main-content-wrapper #sidebar-toggle,.vertical-nav.collapsed~.main-content-wrapper .sidebar-toggle,.main-content-wrapper.sidebar-collapsed #sidebar-toggle,.main-content-wrapper.sidebar-collapsed .sidebar-toggle{left:60px!important;transform:translate(-50%)!important}.vertical-nav.collapsed+.main-content-wrapper #sidebar-toggle,.vertical-nav.collapsed+.main-content-wrapper .sidebar-toggle{left:80px!important;transform:translate(-50%)!important}.main-content-wrapper:not(.sidebar-collapsed) #sidebar-toggle,.main-content-wrapper:not(.sidebar-collapsed) .sidebar-toggle{left:var(--vertical-nav-width, 250px)!important;transform:translate(-50%)!important}.vertical-nav.collapsed~.main-content-wrapper #sidebar-toggle .material-symbols-outlined,.main-content-wrapper.sidebar-collapsed #sidebar-toggle .material-symbols-outlined{transform:rotate(180deg)}.main-content-wrapper:not(.sidebar-collapsed) #sidebar-toggle{left:280px!important;transform:translate(-50%)!important}.main-content-wrapper.sidebar-collapsed #sidebar-toggle{left:100px!important;transform:translate(-50%)!important}#sidebar-toggle .material-symbols-outlined{transform:none!important}.vertical-nav.collapsed+.main-content-wrapper #sidebar-toggle{left:100px!important;transform:translate(-50%)!important}.vertical-nav:not(.collapsed)+.main-content-wrapper #sidebar-toggle{left:280px!important;transform:translate(-50%)!important}#sidebar-toggle{position:fixed!important;top:20px!important;background:#3b82f61a!important;border:1px solid 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h3{text-align:center;margin-bottom:1rem;color:var(--color-text-primary)}.payment-modal-close{position:absolute;top:10px;right:15px;background:none;border:none;font-size:1.8rem;cursor:pointer;color:var(--color-text-secondary)}#payment-form input{width:100%;padding:12px;margin:.5rem 0 1rem;border-radius:4px;border:1px solid var(--color-border)}#payment-form .download-button{width:100%}#payment-status{text-align:center;padding:1rem}.payment-modal-content p{text-align:center;line-height:1.6;word-break:break-word}#modal-price,#modal-doc-title{text-transform:capitalize;font-weight:700;display:inline-block;margin-top:5px}.login-popup-overlay{position:fixed;inset:0;background-color:var(--bg-overlay-dark);display:flex;align-items:center;justify-content:center;z-index:2000;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px)}.login-popup-content{background-color:var(--bg-secondary);color:var(--text-heading);padding:30px 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ease}.login-popup-button:hover{background-color:var(--accent-primary-hover);color:var(--bg-primary);transform:translateY(-2px)}.page-layout{display:flex;flex-wrap:wrap;gap:30px}.main-content-column{flex:1;min-width:300px;flex-basis:65%;background:var(--color-surface);padding:16px;border-radius:8px;box-shadow:0 2px 10px #0000001a;border:1px solid var(--color-border)}.sidebar-column{flex-basis:30%;min-width:280px;flex-grow:1;background:var(--color-surface);padding:16px;border-radius:8px;box-shadow:0 2px 10px #0000001a;border:1px solid var(--color-border)}.sidebar-widget{background-color:var(--bg-secondary);border:1px solid var(--border-primary);border-radius:8px;padding:20px;margin-bottom:30px;box-shadow:0 2px 5px var(--shadow-color)}.sidebar-widget h3{margin-top:0;margin-bottom:15px;font-size:1.2em;color:var(--text-heading);border-bottom:2px solid 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#a774244d!important;background:linear-gradient(135deg,#c08930,#a77424)!important}.download-button:before{content:"💳"!important;font-size:1.2rem!important}.details-grid{gap:2rem!important}.metadata+.preview-box{margin-top:2rem!important}[data-theme=dark] .metadata p{background:var(--color-surface)!important;border-color:var(--color-border)!important}[data-theme=dark] .metadata p:hover{border-color:var(--color-accent)!important}@media (max-width: 768px){.metadata p{flex-direction:column!important;align-items:flex-start!important;padding:.75rem!important}.metadata strong{margin-bottom:.25rem!important;margin-right:0!important;font-size:.85rem!important}.metadata p span:not(strong){text-align:left!important;font-size:1rem!important}}.metadata-card{display:grid!important;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))!important;gap:1rem!important;margin:1.5rem 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1rem}.hero-title{font-size:1.75rem}.hero-icon{font-size:2rem}.hero-stats{flex-direction:column;gap:1rem}.stat-card{flex-direction:row;justify-content:space-between;padding:1rem 1.5rem}.flashcards-filter-section{margin:0 1rem 2rem;padding:1rem}.flashcards-filter-form{grid-template-columns:1fr}.filter-actions{flex-direction:column;width:100%}.btn-filter-submit,.btn-filter-clear{width:100%;justify-content:center}.flashcards-grid-section{padding:0 1rem 2rem}.flashcards-grid{grid-template-columns:1fr}}@media (max-width: 480px){.hero-title{font-size:1.5rem;gap:.5rem}.hero-subtitle{font-size:1rem}.stat-number{font-size:1.5rem}.card-header{padding:1rem 1rem 0}.card-body,.card-footer{padding:.75rem 1rem}}[data-theme=dark] .flashcard-card:hover{box-shadow:0 8px 24px #00000080}[data-theme=dark] .stat-card{box-shadow:0 2px 8px #0000004d}[data-theme=dark] .stat-card:hover{box-shadow:0 4px 16px #00000080}[data-theme=dark] .flashcards-filter-section{box-shadow:0 2px 8px #0000004d}[data-theme=dark] .btn-filter-submit:hover,[data-theme=dark] .btn-empty-action:hover{box-shadow:0 4px 12px #e44d2680}.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem}.faq-item{background-color:var(--bg-primary);border:1px solid var(--border-primary);border-radius:12px;padding:1.5rem;display:flex;flex-direction:column;transition:transform .2s ease,box-shadow .2s ease}.faq-item:hover{transform:translateY(-5px);box-shadow:0 6px 16px var(--shadow-color)}.faq-item h2{font-size:1.15rem;font-weight:700;margin-bottom:1rem;color:var(--text-heading);flex-grow:1}.faq-item h2 a{text-decoration:none;color:inherit}.faq-item p{line-height:1.6;margin-bottom:1.5rem;color:var(--text-secondary)}.faq-item .btn-secondary{align-self:flex-start}.faq-item p:has(strong:contains("Source Attribution")){font-size:.9rem;color:var(--text-secondary);background-color:var(--bg-primary);border-left:3px solid var(--accent-primary);padding:1rem;margin-top:1rem;border-radius:0 4px 4px 0}@media (max-width: 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var(--accent-glow);z-index:1}.book-info{padding:1rem}.book-category{display:inline-block;color:var(--accent-primary);font-size:.6rem;font-weight:500;text-transform:uppercase;letter-spacing:.05em;margin-bottom:.5rem;opacity:.9}.book-title{font-size:1rem;font-weight:700;color:var(--text-heading);margin-bottom:.75rem;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color .3s ease}.book-description{font-size:.9rem;color:var(--text-secondary);margin-bottom:1rem;line-height:1.4;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.book-card:hover .book-title{color:var(--accent-primary)}.book-author{display:flex;align-items:center;gap:.5rem;color:var(--text-secondary);font-size:.95rem;margin-bottom:1rem}.book-author i{font-size:.85rem;opacity:.7}.book-meta{display:flex;justify-content:space-between;align-items:center;padding-top:1rem;border-top:1px solid 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var(--border-primary)}.empty-icon{font-size:4rem;color:var(--text-disabled);margin-bottom:1rem}.empty-title{font-size:1.5rem;font-weight:700;color:var(--text-heading);margin-bottom:.5rem}.empty-message{color:var(--text-secondary);margin-bottom:2rem}.empty-action{display:inline-flex;align-items:center;gap:.5rem;background:linear-gradient(135deg,var(--accent-primary) 0%,var(--accent-primary-hover) 100%);color:#fff;padding:.75rem 2rem;border-radius:50px;text-decoration:none;font-weight:600;transition:all .3s ease}.empty-action:hover{transform:translateY(-2px);box-shadow:0 10px 30px var(--accent-glow)}.pagination-wrapper{display:flex;justify-content:center;margin-top:4rem;margin-bottom:2rem}.pagination{display:flex;align-items:center;gap:.5rem;background:var(--bg-secondary);padding:.75rem;border-radius:50px;border:1px solid var(--border-primary);box-shadow:0 10px 40px #0003}.page-item{display:flex}.page-link{display:flex;align-items:center;justify-content:center;min-width:44px;height:44px;padding:0 1rem;background:var(--bg-primary);color:var(--text-secondary);text-decoration:none;border-radius:12px;font-weight:600;border:1px solid transparent;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.page-link:hover{background:var(--element-bg-hover);color:var(--text-heading);transform:translateY(-2px);border-color:var(--accent-border)}.page-link.active{background:linear-gradient(135deg,var(--accent-primary) 0%,var(--accent-primary-hover) 100%);color:#fff;box-shadow:0 5px 20px var(--accent-glow)}.page-link.disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.page-dots{display:flex;align-items:center;justify-content:center;min-width:44px;height:44px;color:var(--text-disabled);font-weight:600}@keyframes pulse{0%,to{transform:scale(1) rotate(0)}50%{transform:scale(1.1) rotate(180deg)}}@keyframes gradientShift{0%,to{background-position:0% 50%}50%{background-position:100% 50%}}@media (max-width: 768px){.books-container{padding:1rem}.books-hero{padding:3rem 2rem}.books-hero h1{font-size:2.5rem}.books-hero-subtitle{font-size:1.1rem}.category-section{padding:1.5rem}.section-header{flex-direction:column;align-items:flex-start;gap:1rem}.books-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1.5rem}.book-cover-wrapper{height:240px}.pagination{padding:.5rem}.page-link{min-width:38px;height:38px;padding:0 .75rem;font-size:.9rem}}@media (max-width: 480px){.books-hero h1{font-size:2rem}.books-grid{grid-template-columns:1fr;gap:1.25rem}.categories-grid{gap:.75rem}.category-chip{padding:.6rem 1.2rem;font-size:.9rem}}:root{--primary: #2563eb;--primary-hover: #1d4ed8;--primary-light: rgba(37, 99, 235, .1);--primary-glow: rgba(37, 99, 235, .3);--secondary: #64748b;--success: #059669;--warning: #d97706;--error: #dc2626;--bg-primary: #ffffff;--bg-secondary: #f8fafc;--bg-tertiary: #f1f5f9;--bg-card: #ffffff;--bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--bg-hero: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--text-inverse: #ffffff;--border: #e2e8f0;--border-hover: #cbd5e1;--shadow-xs: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-sm: 0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / .25);--radius-sm: .375rem;--radius: .5rem;--radius-md: .75rem;--radius-lg: 1rem;--radius-xl: 1.5rem;--radius-2xl: 2rem;--transition: all .3s cubic-bezier(.4, 0, .2, 1);--transition-fast: all .15s ease}[data-theme=dark]{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--bg-card: #1e293b;--bg-gradient: linear-gradient(135deg, #4338ca 0%, #7c3aed 100%);--bg-hero: linear-gradient(135deg, #1e293b 0%, #334155 100%);--text-primary: #f8fafc;--text-secondary: #cbd5e1;--text-muted: #64748b;--text-inverse: #0f172a;--border: #334155;--border-hover: #475569;--shadow-xs: 0 1px 2px 0 rgb(0 0 0 / .4);--shadow-sm: 0 1px 3px 0 rgb(0 0 0 / .4), 0 1px 2px -1px rgb(0 0 0 / .4);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .4), 0 2px 4px -2px rgb(0 0 0 / .4);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .4), 0 4px 6px -4px rgb(0 0 0 / .4);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .4), 0 8px 10px -6px rgb(0 0 0 / .4);--shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / .6)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--bg-card: #1e293b;--bg-gradient: linear-gradient(135deg, #4338ca 0%, #7c3aed 100%);--bg-hero: linear-gradient(135deg, #1e293b 0%, #334155 100%);--text-primary: #f8fafc;--text-secondary: #cbd5e1;--text-muted: #64748b;--text-inverse: #0f172a;--border: #334155;--border-hover: #475569;--shadow-xs: 0 1px 2px 0 rgb(0 0 0 / .4);--shadow-sm: 0 1px 3px 0 rgb(0 0 0 / .4), 0 1px 2px -1px rgb(0 0 0 / .4);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .4), 0 2px 4px -2px rgb(0 0 0 / .4);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .4), 0 4px 6px -4px rgb(0 0 0 / .4);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .4), 0 8px 10px -6px rgb(0 0 0 / .4);--shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / .6)}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg-secondary);color:var(--text-primary);line-height:1.6}.book-details-container{max-width:1400px;margin:0 auto;padding:2rem;min-height:100vh;animation:fadeInUp .6s ease-out}.alert{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;margin-bottom:2rem;border-radius:var(--radius-lg);font-weight:500;animation:slideDown .4s ease-out}.alert-success{background:#0596691a;color:var(--success);border:1px solid rgba(5,150,105,.2)}.alert-icon{font-size:1.25rem}.breadcrumb-nav{display:flex;align-items:center;gap:.75rem;margin-bottom:2.5rem;padding:1rem 1.5rem;background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:var(--shadow-xs);font-size:.875rem}.breadcrumb-nav a{color:var(--text-secondary);text-decoration:none;font-weight:500;transition:var(--transition);display:flex;align-items:center;gap:.5rem}.breadcrumb-nav a:hover{color:var(--primary)}.breadcrumb-nav .separator{color:var(--text-muted);font-size:.75rem}.breadcrumb-nav .current{color:var(--primary);font-weight:600}.page-layout{display:grid;grid-template-columns:1fr 350px;gap:3rem;align-items:start}.main-content-column{display:flex;flex-direction:column;gap:2.5rem}.book-hero-section{background:var(--bg-card);border-radius:var(--radius-2xl);padding:3rem;border:1px solid var(--border);box-shadow:var(--shadow-lg);position:relative;overflow:hidden}.book-hero-section:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--bg-gradient)}.book-hero-section{display:grid;grid-template-columns:280px 1fr;gap:3rem;align-items:start}.book-cover-container{position:relative;border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-2xl);background:var(--bg-tertiary);transition:var(--transition)}.book-cover-container:hover{transform:translateY(-8px);box-shadow:0 32px 64px -12px #00000040}.book-cover-large{width:100%;height:420px;object-fit:cover;display:block}.book-overlay-badge{position:absolute;top:1rem;right:1rem;z-index:2}.price-badge{background:linear-gradient(135deg,var(--warning) 0%,#f59e0b 100%);color:#fff;padding:.5rem 1rem;border-radius:var(--radius-lg);font-size:.875rem;font-weight:600;text-shadow:0 1px 2px rgb(0 0 0 / .5);box-shadow:var(--shadow-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.free-badge{background:linear-gradient(135deg,var(--success) 0%,#10b981 100%);color:#fff;padding:.5rem 1rem;border-radius:var(--radius-lg);font-size:.875rem;font-weight:600;text-shadow:0 1px 2px rgb(0 0 0 / .5);box-shadow:var(--shadow-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.book-info{display:flex;flex-direction:column;gap:1.5rem}.book-title{font-size:1.25rem;font-weight:600;color:var(--text-primary);line-height:1.1;margin:0;background:linear-gradient(135deg,var(--text-primary) 0%,var(--primary) 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;animation:shimmer 3s ease-in-out infinite}.book-author{font-size:.9rem;font-weight:500;color:var(--text-secondary);margin:0;display:flex;align-items:center;gap:.5rem}.book-author:before{content:"✍️";font-size:1.25rem}.book-meta{display:flex;flex-direction:column;gap:1rem;padding:1.5rem;background:var(--bg-secondary);border-radius:var(--radius-lg);border:1px solid var(--border)}.meta-item{display:flex;align-items:center;gap:.75rem;font-size:.95rem;color:var(--text-secondary)}.meta-icon{font-size:1.125rem;opacity:.8}.meta-item a{color:var(--primary);text-decoration:none;font-weight:500;transition:var(--transition)}.meta-item a:hover{color:var(--primary-hover)}.action-buttons{display:flex;gap:1rem;margin-top:1rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.75rem;padding:1rem 2rem;font-size:1rem;font-weight:600;border-radius:var(--radius-lg);border:none;cursor:pointer;transition:var(--transition);text-decoration:none;position:relative;overflow:hidden;white-space:nowrap}.btn:before{content:"";position:absolute;top:50%;left:50%;width:0;height:0;background:#fff3;border-radius:50%;transition:width .6s ease,height .6s ease;transform:translate(-50%,-50%)}.btn:hover:before{width:300px;height:300px}.btn-primary{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-hover) 100%);color:var(--text-inverse);box-shadow:var(--shadow-md)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px var(--primary-glow)}.btn-secondary{background:var(--bg-card);color:var(--primary);border:2px solid var(--border);box-shadow:var(--shadow-xs)}.btn-secondary:hover{background:var(--primary);color:var(--text-inverse);border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-icon{font-size:1.125rem;opacity:.9}.book-description-section,.book-preview-section,.social-share-section{background:var(--bg-card);border-radius:var(--radius-xl);padding:2.5rem;border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:var(--transition)}.book-description-section:hover,.book-preview-section:hover,.social-share-section:hover{box-shadow:var(--shadow-md);border-color:var(--border-hover)}.book-description-section h3,.book-preview-section h3,.social-share-section h3{display:flex;align-items:center;gap:1rem;font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:2px solid var(--border)}.section-icon{font-size:1.5rem;opacity:.8}.description-content{color:var(--text-secondary);line-height:1.8;font-size:1.05rem}.preview-info{color:var(--text-secondary);margin-bottom:1.5rem;font-size:.95rem}.preview-container{position:relative;border-radius:var(--radius-lg);overflow:hidden;background:var(--bg-tertiary);border:1px solid var(--border);box-shadow:var(--shadow-md)}.preview-overlay{position:absolute;inset:0;background:transparent;z-index:10;pointer-events:none}.preview-embed{width:100%;height:600px;border:none;display:block}.social-share-buttons{display:flex;gap:1rem;flex-wrap:wrap}.share-btn{display:flex;align-items:center;justify-content:center;width:50px;height:50px;border-radius:var(--radius-lg);background:var(--bg-secondary);color:var(--text-secondary);text-decoration:none;transition:var(--transition);border:1px solid var(--border)}.share-btn:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}.share-btn-facebook:hover{background:#1877f2;color:#fff}.share-btn-twitter:hover{background:#1da1f2;color:#fff}.share-btn-whatsapp:hover{background:#25d366;color:#fff}.share-btn-linkedin:hover{background:#0077b5;color:#fff}.share-btn-telegram:hover{background:#08c;color:#fff}.sidebar-column{display:flex;flex-direction:column;gap:2rem;position:sticky;top:2rem;height:fit-content}.sidebar-widget{background:var(--bg-card);border-radius:var(--radius-xl);padding:2rem;border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:var(--transition)}.sidebar-widget:hover{box-shadow:var(--shadow-md);border-color:var(--border-hover)}.sidebar-widget h3{display:flex;align-items:center;gap:.75rem;font-size:1.25rem;font-weight:700;color:var(--text-primary);margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:2px solid var(--border)}.widget-icon{font-size:1.25rem;opacity:.8}.related-books-grid{display:flex;flex-direction:column;gap:1.5rem}.related-book-card{display:flex;gap:1rem;padding:1rem;background:var(--bg-secondary);border-radius:var(--radius-lg);border:1px solid var(--border);transition:var(--transition);text-decoration:none;color:inherit}.related-book-card:hover{transform:translate(5px);box-shadow:var(--shadow-md);border-color:var(--primary)}.book-cover-small{flex-shrink:0;width:60px;height:80px;border-radius:var(--radius);overflow:hidden;background:var(--bg-tertiary)}.book-cover-small img{width:100%;height:100%;object-fit:cover}.related-book-card .book-info{flex:1;display:flex;flex-direction:column;gap:.5rem}.related-book-card h4{font-size:.95rem;font-weight:600;color:var(--text-primary);margin:0;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.related-book-card .book-author{font-size:.8rem;color:var(--text-secondary);margin:0}.related-book-card .book-meta{padding:0;background:none;border:none;margin-top:auto}.book-price{font-weight:600;color:var(--primary);font-size:.85rem}.book-free{font-weight:600;color:var(--success);font-size:.85rem}.no-related{text-align:center;padding:2rem 1rem;color:var(--text-muted)}.no-related-icon{font-size:2rem;display:block;margin-bottom:1rem;opacity:.5}.payment-modal-overlay{position:fixed;inset:0;background:#000000bf;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:9999;animation:fadeIn .3s ease}.payment-modal-content{background:var(--bg-card);border-radius:var(--radius-2xl);padding:2.5rem;max-width:500px;width:90%;max-height:90vh;overflow-y:auto;position:relative;border:1px solid var(--border);box-shadow:var(--shadow-2xl);animation:slideUp .4s ease}.payment-modal-close{position:absolute;top:1.5rem;right:1.5rem;width:40px;height:40px;border-radius:50%;background:var(--bg-secondary);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:var(--text-secondary);cursor:pointer;transition:var(--transition)}.payment-modal-close:hover{background:var(--error);color:#fff;transform:rotate(90deg)}.payment-modal-content h3{font-size:1.75rem;font-weight:700;color:var(--text-primary);margin-bottom:1rem;text-align:center}.payment-modal-content p{color:var(--text-secondary);text-align:center;margin-bottom:2rem}#payment-form{display:flex;flex-direction:column;gap:1.5rem}#payment-form label{font-weight:600;color:var(--text-primary);font-size:.95rem}#payment-form input{padding:1rem 1.5rem;background:var(--bg-secondary);border:2px solid var(--border);border-radius:var(--radius-lg);color:var(--text-primary);font-size:1rem;transition:var(--transition)}#payment-form input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}#payment-status{text-align:center;padding:2rem;font-size:1.1rem;color:var(--text-secondary)}.login-popup-overlay{position:fixed;inset:0;background:#000c;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:9999}.login-popup-content{background:var(--bg-card);border-radius:var(--radius-2xl);padding:3rem;text-align:center;max-width:400px;width:90%;border:1px solid var(--border);box-shadow:var(--shadow-2xl);animation:slideUp .4s ease}.login-popup-content .icon{font-size:4rem;margin-bottom:1.5rem;opacity:.8}.login-popup-content h2{font-size:1.75rem;font-weight:700;color:var(--text-primary);margin-bottom:1rem}.login-popup-content p{color:var(--text-secondary);margin-bottom:2rem;line-height:1.6}.login-popup-button{display:inline-flex;align-items:center;justify-content:center;padding:1rem 2rem;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-hover) 100%);color:var(--text-inverse);text-decoration:none;border-radius:var(--radius-lg);font-weight:600;transition:var(--transition);box-shadow:var(--shadow-md)}.login-popup-button:hover{transform:translateY(-2px);box-shadow:0 8px 25px var(--primary-glow)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{transform:translateY(50px) scale(.95);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}@keyframes slideDown{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes shimmer{0%,to{background-position:0% 50%}50%{background-position:100% 50%}}@media (max-width: 1024px){.page-layout{grid-template-columns:1fr;gap:2rem}.sidebar-column{position:static;order:-1}.book-hero-section{grid-template-columns:240px 1fr;gap:2rem}}@media (max-width: 768px){.book-details-container{padding:1rem}.book-hero-section{grid-template-columns:1fr;gap:2rem;padding:2rem}.book-cover-container{max-width:280px;margin:0 auto}.action-buttons{flex-direction:column}.btn,.social-share-buttons{justify-content:center}.related-books-grid{gap:1rem}.payment-modal-content{padding:2rem;margin:1rem}}@media (max-width: 480px){.book-hero-section{padding:1.5rem}.book-title{font-size:1rem}.book-author{font-size:1.25rem}.btn{padding:.875rem 1.5rem;font-size:.95rem}.breadcrumb-nav{font-size:.8rem;padding:.75rem 1rem}.sidebar-widget,.book-description-section,.book-preview-section,.social-share-section{padding:1.5rem}}