@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";:root{--white: #ffffff;--black: #000000;--gray-50: #fcfcfc;--gray-100: #f5f5f5;--gray-200: #ececec;--gray-300: #dcdcdc;--gray-400: #a0a0a0;--gray-500: #707070;--gray-600: #4a4a4a;--gray-700: #2a2a2a;--gray-800: #1a1a1a;--gray-900: #0a0a0a;--blue-500: #000000;--blue-600: #000000;--blue-50: #f0f0f0;--font: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--radius: 20px;--radius-sm: 12px;--shadow-sm: 0 2px 4px rgba(0,0,0,.02);--shadow: 0 4px 12px rgba(0,0,0,.03);--shadow-md: 0 8px 24px rgba(0,0,0,.05);--shadow-lg: 0 12px 32px rgba(0,0,0,.08);--transition: all .25s cubic-bezier(.4, 0, .2, 1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font);background:var(--gray-50);color:var(--gray-900);line-height:1.6;-webkit-font-smoothing:antialiased}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3;color:var(--gray-900)}a{text-decoration:none;color:var(--blue-600)}a:hover{text-decoration:underline}.app-layout{display:flex;min-height:100vh}.sidebar{width:240px;background:var(--white);border-right:1px solid var(--gray-200);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100}.sidebar-brand{padding:24px 20px;border-bottom:1px solid var(--gray-200)}.sidebar-brand h1{font-size:1.25rem;font-weight:700;color:var(--black);letter-spacing:-.5px}.sidebar-brand span{font-size:.7rem;color:var(--gray-400);text-transform:uppercase;letter-spacing:1px}.sidebar-nav{flex:1;padding:12px;display:flex;flex-direction:column;gap:2px;overflow-y:auto}.sidebar-section{padding:12px 8px 6px;font-size:.65rem;text-transform:uppercase;letter-spacing:1.2px;color:var(--gray-400);font-weight:600}.nav-link{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);color:var(--gray-600);font-size:.875rem;font-weight:500;transition:var(--transition);text-decoration:none}.nav-link:hover{background:var(--gray-100);color:var(--gray-900);text-decoration:none}.nav-link.active{background:var(--black);color:var(--white);box-shadow:0 4px 12px #0000001a}.sidebar-footer{padding:12px;border-top:1px solid var(--gray-200)}.user-badge{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);background:var(--gray-50)}.user-avatar{width:36px;height:36px;border-radius:50%;background:var(--black);color:var(--white);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:600}.user-info{flex:1;min-width:0}.user-info p{font-size:.8rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-info span{font-size:.7rem;color:var(--gray-400);text-transform:capitalize}.btn-logout{background:none;border:none;cursor:pointer;color:var(--gray-400);padding:4px;border-radius:4px;transition:var(--transition)}.btn-logout:hover{color:var(--red-500)}.main-content{flex:1;margin-left:240px;padding:32px;min-height:100vh}.page-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:24px}.page-header h2{font-size:1.5rem}.page-header p{color:var(--gray-500);font-size:.875rem;margin-top:2px}.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;font-family:var(--font);cursor:pointer;transition:var(--transition);border:1px solid transparent;white-space:nowrap}.btn-primary{background:var(--gray-900);color:var(--white);border-color:var(--gray-900)}.btn-primary:hover{background:var(--black)}.btn-secondary{background:var(--white);color:var(--gray-700);border-color:var(--gray-300)}.btn-secondary:hover{background:var(--gray-50)}.btn-danger{background:var(--white);color:var(--red-500);border-color:var(--gray-200)}.btn-danger:hover{background:var(--red-50);border-color:var(--red-500)}.btn-icon{padding:6px;background:none;border:1px solid var(--gray-200);border-radius:6px;cursor:pointer;color:var(--gray-500);transition:var(--transition);display:inline-flex;align-items:center;justify-content:center}.btn-icon:hover{background:var(--gray-100);color:var(--gray-900)}.btn-icon.danger:hover{background:var(--red-50);color:var(--red-500);border-color:var(--red-500)}.btn:disabled{opacity:.5;cursor:not-allowed}.card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius);padding:20px;transition:var(--transition)}.card:hover{box-shadow:var(--shadow-md);border-color:var(--gray-300)}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.card-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:12px}.card-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:8px}.card h3{font-size:1rem;font-weight:600}.card .card-desc{font-size:.8rem;color:var(--gray-500);margin-top:4px}.card .card-meta{display:flex;gap:12px;margin-top:12px;padding-top:12px;border-top:1px solid var(--gray-100);font-size:.75rem;color:var(--gray-400)}.card .card-actions{display:flex;gap:6px}.table-wrap{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius);overflow:hidden}.data-table{width:100%;border-collapse:collapse}.data-table th{text-align:left;padding:12px 16px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--gray-500);background:var(--gray-50);border-bottom:1px solid var(--gray-200)}.data-table td{padding:14px 16px;font-size:.875rem;border-bottom:1px solid var(--gray-100)}.data-table tr:last-child td{border-bottom:none}.data-table tr:hover td{background:var(--gray-50)}.data-table .actions{text-align:right}.data-table .actions div{display:flex;gap:6px;justify-content:flex-end}.mono{font-family:SF Mono,monospace;font-size:.75rem;color:var(--gray-400)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:200;padding:20px;animation:fadeIn .15s ease}.modal{background:var(--white);border-radius:var(--radius);width:100%;max-width:480px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg);animation:slideUp .2s ease}.modal-header{padding:20px 24px;border-bottom:1px solid var(--gray-200)}.modal-header h3{font-size:1.1rem}.modal-body{padding:24px}.modal-footer{padding:16px 24px;border-top:1px solid var(--gray-200);display:flex;justify-content:flex-end;gap:8px}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:.8rem;font-weight:500;color:var(--gray-700);margin-bottom:6px}.form-control{width:100%;padding:10px 12px;border:1px solid var(--gray-300);border-radius:var(--radius-sm);font-size:.875rem;font-family:var(--font);color:var(--gray-900);background:var(--white);transition:var(--transition)}.form-control:focus{outline:none;border-color:var(--gray-900);box-shadow:0 0 0 3px #00000014}select.form-control{cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");background-position:right 8px center;background-repeat:no-repeat;background-size:20px;padding-right:36px}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--white);padding:20px}.auth-card{width:100%;max-width:400px}.auth-card h1{font-size:1.5rem;margin-bottom:4px}.auth-card .subtitle{color:var(--gray-500);font-size:.9rem;margin-bottom:28px}.auth-card .form-group{margin-bottom:16px}.auth-card .btn-primary{width:100%;justify-content:center;padding:12px;margin-top:8px}.auth-footer{text-align:center;margin-top:20px;font-size:.875rem;color:var(--gray-500)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-bottom:28px}.stat-card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius);padding:20px;display:flex;align-items:center;gap:14px}.stat-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center}.stat-card h3{font-size:1.5rem;font-weight:700;line-height:1}.stat-card p{font-size:.75rem;color:var(--gray-500);margin-top:2px}.empty-state{text-align:center;padding:60px 20px;color:var(--gray-400)}.empty-state p{margin-top:8px;font-size:.875rem}.alert{padding:12px 16px;border-radius:var(--radius-sm);font-size:.875rem;margin-bottom:16px}.alert-error{background:var(--red-50);color:var(--red-500);border:1px solid rgba(239,68,68,.2)}.alert-success{background:var(--green-50);color:var(--green-500);border:1px solid rgba(34,197,94,.2)}.loading{display:flex;justify-content:center;align-items:center;padding:60px}@keyframes spin{to{transform:rotate(360deg)}}.spinner{animation:spin .6s linear infinite}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:slideUp .3s ease}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--gray-400)}.toast-container{position:fixed;top:20px;right:20px;z-index:300;display:flex;flex-direction:column;gap:8px}.toast{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius-sm);padding:12px 16px;font-size:.875rem;box-shadow:var(--shadow-lg);animation:slideUp .3s ease;display:flex;align-items:center;gap:8px;min-width:280px}.breadcrumb-link{color:var(--gray-500);text-decoration:none;font-size:.85rem;transition:color .2s}.breadcrumb-link:hover{color:var(--black)}.tab-btn{transition:all .2s ease;position:relative}.tab-btn:hover{color:var(--black)!important}.tab-btn.active:after{content:"";position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--black)}.chapters-list .card{transition:transform .2s ease,border-color .2s ease}.chapters-list .card:hover{border-color:var(--black);transform:translate(4px)}