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a:hover{color:var(--primary-orange-light)}.error-message{background:#ef44441a;border:1px solid rgba(239,68,68,.3);color:#ef4444;padding:.75rem 1rem;border-radius:var(--border-radius-sm);margin-bottom:1rem;font-size:.875rem}.success-message{background:#22c55e1a;border:1px solid rgba(34,197,94,.3);color:#22c55e;padding:.75rem 1rem;border-radius:var(--border-radius-sm);margin-bottom:1rem;font-size:.875rem}.loading{display:inline-flex;align-items:center;gap:.5rem}.spinner{width:16px;height:16px;border:2px solid transparent;border-top:2px solid currentColor;border-radius:50%;animation:spin 1s linear infinite}.teacher-fields{margin-top:1rem}@media (max-width: 768px){.auth-modal-content{width:95%;max-height:95vh;margin:1rem}.auth-header{padding:1.5rem 1.5rem 1rem}.auth-tabs{margin:0 1.5rem 1.5rem}.auth-form{padding:0 1.5rem 1.5rem}.user-type-selector{grid-template-columns:1fr;gap:.75rem}.user-type-option{padding:.875rem}.user-type-icon{font-size:1.75rem}}.page-hero{padding:8rem 0 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50%);pointer-events:none}.values-header{text-align:center;margin-bottom:4rem;position:relative;z-index:1}.values-subtitle{font-size:1.125rem;color:var(--text-secondary);margin-top:1rem;font-weight:500}.values-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem;position:relative;z-index:1}.value-card{background:var(--bg-card);border:1px solid var(--bg-tertiary);border-radius:var(--border-radius);padding:2rem;text-align:center;transition:var(--transition-normal);position:relative;overflow:hidden}.value-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary-blue),var(--primary-orange));transform:scaleX(0);transition:var(--transition-normal)}.value-card:hover:before{transform:scaleX(1)}.value-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--primary-blue)}.value-icon{width:70px;height:70px;background:linear-gradient(135deg,var(--primary-blue),var(--primary-orange));border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.75rem;margin:0 auto 1.5rem;box-shadow:var(--shadow-md)}.value-card h3{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin-bottom:1rem}.value-card p{color:var(--text-secondary);line-height:1.7;font-size:1rem}.about-section{padding:6rem 0;background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--bg-primary) 100%);position:relative;overflow:hidden}.about-section:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 20%,rgba(59,130,246,.05) 0%,transparent 50%);pointer-events:none}.about-content{position:relative;z-index:1}.about-header{text-align:center;margin-bottom:4rem}.about-subtitle{font-size:1.25rem;color:var(--text-secondary);margin-top:1rem;font-weight:500}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:start;margin-bottom:4rem}.about-text{display:flex;flex-direction:column;gap:2rem}.about-card{background:var(--bg-card);border:1px solid var(--bg-tertiary);border-radius:var(--border-radius);padding:2rem;transition:var(--transition-normal);position:relative;overflow:hidden}.about-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary-blue),var(--primary-orange));transform:scaleX(0);transition:var(--transition-normal)}.about-card:hover:before{transform:scaleX(1)}.about-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--primary-blue)}.about-icon{width:60px;height:60px;background:linear-gradient(135deg,var(--primary-blue),var(--primary-orange));border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:1.5rem;box-shadow:var(--shadow-md)}.about-card h3{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin-bottom:1rem}.about-card p{color:var(--text-secondary);line-height:1.7;font-size:1rem}.about-visual{display:flex;flex-direction:column;gap:2rem}.about-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem}.stat-item{background:var(--bg-card);border:1px solid 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.page-header{text-align:center;margin-bottom:3rem}.announcements-page .page-header h1{font-size:2.5rem;color:var(--text-primary);margin-bottom:.75rem}.announcements-page .page-header p{font-size:1.1rem;color:var(--text-secondary)}.announcements-loading,.announcements-error,.announcements-empty{text-align:center;padding:3rem 1.5rem;background:var(--bg-card);border-radius:16px;border:1px solid var(--bg-tertiary)}.announcements-error{color:#dc3545}.announcements-hero{background:linear-gradient(135deg,#3b82f61f,#f973161f);border-radius:24px;padding:2.5rem;margin-bottom:2.5rem}.announcements-hero-card{background:#0f172ad9;color:#fff;border-radius:20px;padding:2rem;display:flex;flex-direction:column;gap:1.25rem;box-shadow:0 18px 32px #0f172a59}.interactive{cursor:pointer}.announcements-hero-card.interactive:hover,.announcement-card.interactive:hover{transform:translateY(-6px);box-shadow:0 22px 40px #0f172a40}.announcements-hero-card .hero-image{width:100%;max-height:260px;overflow:hidden;border-radius:16px}.announcements-hero-card .hero-image img{width:100%;height:100%;object-fit:cover;display:block}.hero-card-header{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem;font-size:.95rem}.hero-pill{background:#3b82f6e6;color:#fff;padding:.35rem .85rem;border-radius:999px;font-weight:600}.hero-date{color:#ffffffd9}.announcements-hero-card h2{font-size:2rem;line-height:1.3}.announcements-hero-card p{font-size:1.05rem;color:#ffffffeb;line-height:1.7}.hero-footer{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}.hero-category{background:#ffffff1f;color:#fff;padding:.3rem .75rem;border-radius:12px;font-size:.9rem}.hero-footer a{color:#fff;font-weight:600;text-decoration:underline}.announcements-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem}.announcement-card{background:var(--bg-card);border:1px solid 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.75rem;border-radius:12px;font-size:.85rem}.announcement-title{font-size:1.5rem;color:var(--text-primary)}.announcement-content{font-size:1rem;color:var(--text-secondary);line-height:1.6;white-space:pre-line}.announcement-link{align-self:flex-start;color:var(--primary-blue);font-weight:600;display:inline-flex;align-items:center;gap:.4rem}.announcement-link:after{content:"↗";font-size:.9rem}.announcement-modal-overlay{position:fixed;inset:0;background:#0f172aa6;z-index:1000;display:flex;align-items:center;justify-content:center;padding:2rem 1rem}.announcement-modal{background:var(--bg-card);border-radius:16px;max-width:720px;max-height:90vh;width:100%;overflow:auto;position:relative;box-shadow:0 22px 45px #0f172a59}.announcement-modal-close{position:absolute;top:1rem;right:1rem;background:#0f172a99;color:#fff;border:none;width:36px;height:36px;border-radius:50%;cursor:pointer;font-size:1rem}.announcement-modal-image{width:100%;background:#0f172ad9;display:flex;justify-content:center;align-items:center}.announcement-modal-image img{width:100%;height:auto;max-height:70vh;object-fit:contain;display:block}.announcement-modal-body{padding:2rem 2.25rem;display:flex;flex-direction:column;gap:1rem}.announcement-modal-meta{display:flex;flex-wrap:wrap;gap:.75rem;color:var(--text-secondary);font-size:.95rem}.announcement-modal-category{background:#3b82f61f;color:var(--primary-blue);padding:.25rem .75rem;border-radius:12px;font-size:.85rem}.announcement-modal-category.pinned{background:#f973161f;color:var(--primary-orange)}.announcement-modal h2{font-size:2rem;color:var(--text-primary)}.announcement-modal 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p{color:var(--text-secondary);font-size:1.05rem}.announcements-view-all{color:var(--primary-blue);font-weight:600;text-decoration:none}.announcements-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem}.announcements-card{background:var(--bg-card);border:1px solid var(--bg-tertiary);border-radius:16px;overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .2s ease,transform .2s ease}.announcements-card:hover{transform:translateY(-6px);box-shadow:0 18px 32px #0f172a1f}.announcements-card-image img{width:100%;height:180px;object-fit:cover;display:block}.announcements-card-body{padding:1.5rem;display:flex;flex-direction:column;gap:.75rem}.announcements-card-meta{display:flex;gap:.75rem;font-size:.85rem;color:var(--text-muted);flex-wrap:wrap}.announcements-card-meta span:nth-child(2){background:#3b82f61f;color:var(--primary-blue);padding:.25rem .6rem;border-radius:10px}.announcements-card 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100%)}.loading-state{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;color:var(--text-secondary)}.loading-spinner{width:50px;height:50px;border:3px solid var(--bg-tertiary);border-top:3px solid var(--primary-blue);border-radius:50%;animation:spin 1s linear infinite;margin-bottom:1rem}.books-filters-section{padding:2rem 0;background:var(--bg-secondary);border-bottom:1px solid var(--bg-tertiary)}.books-filters-container{background:var(--bg-card);border:1px solid var(--bg-tertiary);border-radius:var(--border-radius);padding:2rem;box-shadow:var(--shadow-md)}.books-filter-row{display:grid;grid-template-columns:1fr 1fr 2fr;gap:2rem;align-items:end}.books-filter-group{display:flex;flex-direction:column;gap:.5rem}.books-filter-group label{font-size:.875rem;font-weight:600;color:var(--text-primary);text-transform:uppercase;letter-spacing:.05em}.books-filter-select{padding:.875rem 1rem;background:var(--bg-secondary);border:1px solid 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0}.books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem}.book-card{background:var(--bg-card);border:1px solid var(--bg-tertiary);border-radius:var(--border-radius);overflow:hidden;transition:var(--transition-normal);position:relative;display:flex;flex-direction:column;height:100%}.book-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-xl);border-color:var(--primary-blue)}.book-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary-blue),var(--primary-orange));transform:scaleX(0);transition:var(--transition-normal)}.book-card:hover:before{transform:scaleX(1)}.book-featured-badge{position:absolute;top:1rem;right:1rem;background:linear-gradient(135deg,var(--primary-orange),var(--primary-orange-light));color:#fff;padding:.375rem 1rem;border-radius:20px;font-size:.75rem;font-weight:600;z-index:2;box-shadow:var(--shadow-md)}.book-cover{width:100%;height:360px;background:var(--bg-secondary);display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative}.book-cover img{width:100%;height:100%;object-fit:cover;transition:var(--transition-normal)}.book-card:hover .book-cover img{transform:scale(1.05)}.book-cover-placeholder{display:flex;align-items:center;justify-content:center;width:100%;height:100%;background:linear-gradient(135deg,var(--bg-tertiary),var(--bg-secondary))}.book-cover-placeholder span{font-size:5rem;opacity:.3}.book-info{padding:1.5rem;flex:1;display:flex;flex-direction:column}.book-header{margin-bottom:1rem}.book-title{font-size:1.25rem;font-weight:700;color:var(--text-primary);margin-bottom:.5rem;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.book-author{font-size:.875rem;color:var(--text-muted);font-weight:500}.book-meta{display:flex;flex-wrap:wrap;gap:1rem;margin-bottom:1rem}.book-meta-item{font-size:.75rem;color:var(--text-muted);display:flex;align-items:center;gap:.375rem}.book-description{font-size:.875rem;color:var(--text-secondary);line-height:1.6;margin-bottom:1.5rem;flex:1;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.book-footer{display:flex;align-items:center;justify-content:space-between;padding-top:1rem;margin-top:auto;border-top:1px solid var(--bg-tertiary)}.book-price{font-size:1.75rem;font-weight:800;background:linear-gradient(135deg,var(--primary-blue-light),var(--primary-orange));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.book-actions{display:flex;gap:.5rem}.book-btn-details{padding:.5rem 1rem;background:var(--bg-secondary);border:1px solid var(--bg-tertiary);border-radius:var(--border-radius-sm);color:var(--text-secondary);font-size:.75rem;font-weight:600;cursor:pointer;transition:var(--transition-normal)}.book-btn-details:hover{background:var(--bg-tertiary);color:var(--text-primary);transform:translateY(-2px)}.book-btn-buy{padding:.5rem 1.25rem;background:linear-gradient(135deg,var(--primary-blue),var(--primary-blue-light));color:#fff;border:none;border-radius:var(--border-radius-sm);font-size:.75rem;font-weight:600;cursor:pointer;transition:var(--transition-normal);text-decoration:none}.book-btn-buy:hover{background:linear-gradient(135deg,var(--primary-blue-dark),var(--primary-blue));transform:translateY(-2px);box-shadow:var(--shadow-lg)}.books-empty-state{text-align:center;padding:5rem 2rem;color:var(--text-secondary);background:var(--bg-card);border:1px solid var(--bg-tertiary);border-radius:var(--border-radius)}.books-empty-icon{font-size:5rem;margin-bottom:1.5rem;display:block;opacity:.5}.books-empty-state h3{font-size:1.75rem;color:var(--text-primary);margin-bottom:.75rem;font-weight:700}.books-empty-state p{font-size:1rem;max-width:400px;margin:0 auto}.book-modal{display:flex;position:fixed;z-index:10000;left:0;top:0;width:100%;height:100%;background-color:#000000d9;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);align-items:center;justify-content:center;animation:modalFadeIn .3s ease-out;padding:2rem}.book-modal-content{background:var(--bg-card);border:1px solid var(--bg-tertiary);border-radius:var(--border-radius);max-width:1000px;width:100%;max-height:90vh;overflow:auto;position:relative;box-shadow:var(--shadow-xl);animation:modalSlideIn .3s ease-out}.book-modal-close{position:absolute;top:1.5rem;right:1.5rem;width:44px;height:44px;background:var(--bg-secondary);border:1px solid var(--bg-tertiary);border-radius:50%;color:var(--text-muted);font-size:1.75rem;cursor:pointer;transition:var(--transition-fast);display:flex;align-items:center;justify-content:center;z-index:1}.book-modal-close:hover{background:var(--bg-tertiary);color:var(--text-primary);transform:rotate(90deg)}.book-modal-body{display:grid;grid-template-columns:350px 1fr;gap:3rem;padding:3rem}.book-modal-cover{width:100%;height:450px;background:var(--bg-secondary);border-radius:var(--border-radius-sm);overflow:hidden;box-shadow:var(--shadow-lg)}.book-modal-cover img{width:100%;height:100%;object-fit:cover}.book-modal-info{display:flex;flex-direction:column;gap:2rem}.book-modal-info h2{font-size:2.25rem;font-weight:800;color:var(--text-primary);line-height:1.2}.book-modal-author{font-size:1.25rem;color:var(--text-muted);margin-top:-1.5rem;font-weight:500}.book-modal-details{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}.book-detail-item{background:var(--bg-secondary);padding:1.25rem;border-radius:var(--border-radius-sm);border:1px solid var(--bg-tertiary)}.book-detail-label{font-size:.75rem;color:var(--text-muted);margin-bottom:.5rem;text-transform:uppercase;letter-spacing:.05em;font-weight:600}.book-detail-value{font-size:1rem;color:var(--text-primary);font-weight:500}.book-modal-description{padding:1.75rem;background:var(--bg-secondary);border-radius:var(--border-radius-sm);border:1px solid var(--bg-tertiary)}.book-modal-description h3{font-size:1.25rem;font-weight:700;color:var(--text-primary);margin-bottom:1rem}.book-modal-description p{font-size:.875rem;color:var(--text-secondary);line-height:1.7}.book-modal-footer{display:flex;align-items:center;justify-content:space-between;padding-top:2rem;border-top:1px solid var(--bg-tertiary)}.book-modal-price{font-size:2.5rem;font-weight:800;background:linear-gradient(135deg,var(--primary-blue-light),var(--primary-orange));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.book-modal-btn-buy{padding:1rem 2rem;background:linear-gradient(135deg,var(--primary-blue),var(--primary-blue-light));color:#fff;border:none;border-radius:var(--border-radius-sm);font-size:1rem;font-weight:600;cursor:pointer;transition:var(--transition-normal);text-decoration:none;display:inline-flex;align-items:center;gap:.5rem;box-shadow:var(--shadow-md)}.book-modal-btn-buy:hover{background:linear-gradient(135deg,var(--primary-blue-dark),var(--primary-blue));transform:translateY(-2px);box-shadow:var(--shadow-lg)}@keyframes 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